JP2018152501A - Non-contact power transmission unit and non-contact power transmission system - Google Patents

Abstract

[Problem] To provide a contactless power transmission unit and a contactless power transmission system that can suppress radiated magnetic fields while preventing the unit from becoming large. [Solution] The contactless power transmission unit (1) and the contactless power transmission system include a communication coupler (20) that is provided on a preset reference line and transmits or receives signals, and a power transmission coil (30) that has a plurality of coil sections (31) formed in a spiral shape around each coil axis along the reference line (Za) and arranged around the reference line, and in at least one pair of adjacent coil sections (31), current flows in counter-rotating directions around the coil axis between one coil section (31) and the other coil section (31), transmitting power contactlessly. [Selected Figure] Figure 2

Description

  The present invention relates to a contactless power transmission unit and a contactless power transmission system.

  Conventionally, a non-contact power transmission device transmits power in a non-contact manner from a non-contact power transmission unit on a power transmission side to a non-contact power transmission unit on a power reception side. The non-contact power transmission unit on the power transmission side or the power reception side includes a power transmission coil that transmits power by electromagnetic induction or the like, and a magnetic field is radiated from the power transmission coil when a current flows through the power transmission coil. Patent Document 1 has a plurality of unit coils obtained by dividing a power transmission coil in order to suppress the radiation magnetic field radiated from the power transmission coil from affecting the outside, and a reverse current is applied to adjacent unit coils. The flowing radiation magnetic field is canceled and suppressed.

JP 2012-134217 A

  By the way, it is desired that the non-contact power transmission unit includes a communication device together with the power transmission coil. In this case, the non-contact power transmission unit tends to install the communication device away from the power transmission coil in order to suppress the radiation magnetic field generated by the power transmission coil from affecting the communication device. For this reason, since the unit of the non-contact power transmission unit is enlarged, there is room for improvement in this respect.

  Then, this invention is made | formed in view of the above, Comprising: Provided the non-contact electric power transmission unit and non-contact electric power transmission system which can suppress the enlargement of a unit, after suppressing a radiation magnetic field. Objective.

  In order to solve the above-described problems and achieve the object, a non-contact power transmission unit according to the present invention is provided on a preset reference line, and communicates with and transmits a signal along the reference line. Each coil axis is formed in a spiral shape around each coil axis, and has a plurality of coil portions provided around the reference line, and at least one set of adjacent coil portions as viewed from the direction along the reference line. The coil portion and the other coil portion include a power transmission coil in which current flows in a reverse direction around the coil axis and transmits power in a non-contact manner.

  In the non-contact power transmission unit, the plurality of coil portions are preferably formed by winding one conductive wire along a direction orthogonal to the reference line.

  In the non-contact power transmission unit, it is preferable that the plurality of coil portions are adjacent to each other in a direction intersecting the reference line.

  Further, in the non-contact power transmission unit, the plurality of coil portions are adjacent to each other when each of the coil axis lines is shifted from the reference line and viewed from a direction along the reference line. It is preferable.

  Further, in the non-contact power transmission unit, the power transmission coil is provided with an even number of the plurality of coil portions, and one of the coil portions and the other coil portion in all combinations of the adjacent coil portions. It is preferable that currents flow in the opposite directions around the coil axis.

  Further, in the non-contact power transmission unit, the plurality of coil portions are adjacent to each other when the coil axis lines are coaxially positioned with the reference line and viewed from a direction along the reference line. It is preferable that one said coil part is located inside and the other said coil part is located outside.

  Further, the contactless power transmission system according to the present invention includes a contactless power transmission unit on a power transmission side that transmits power in a contactless manner, and a power receiving side that receives power transmitted from the contactless power transmission unit on the power transmission side. A non-contact power transmission unit, and at least one of the non-contact power transmission unit on the power transmission side or the non-contact power transmission unit on the power reception side is provided on a preset reference line and transmits or receives a signal At least one set as viewed from the direction along the reference line, including a communication unit and a plurality of coil portions that are formed in a spiral shape around each coil axis along the reference line and provided around the reference line In the coil portions adjacent to each other, one coil portion and the other coil portion have a current flowing in the reverse direction around the coil axis, and transmit power in a non-contact manner. And having a yl, a.

  A non-contact power transmission unit and a non-contact power transmission system according to the present invention include a communication unit provided on a reference line and a plurality of spiral coil units provided around the reference line, and adjacent coil units are mutually connected. Current flows in the reverse direction. Thereby, the non-contact power transmission unit and the non-contact power transmission system can suppress the radiation magnetic field, and the communication unit can be provided at the center of the plurality of coil units, so that the unit can be prevented from being enlarged.

FIG. 1 is a cross-sectional view taken along the line XX of FIG. 2 illustrating a configuration example of the non-contact power transmission system according to the embodiment. FIG. 2 is a front view illustrating a configuration example of the contactless power transmission unit according to the embodiment. FIG. 3 is a conceptual diagram illustrating a radiation magnetic field of the non-contact power transmission unit according to the embodiment. FIG. 4 is a diagram illustrating the degree of the radiated magnetic field of the non-contact power transmission unit according to the embodiment. FIG. 5 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 6 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 7 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 8 is a schematic diagram illustrating a configuration example of the non-contact power transmission unit according to the first modification. FIG. 9 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 10 is a schematic diagram illustrating a configuration example of a non-contact power transmission unit according to the first modification. FIG. 11 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 12 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 13 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 14 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 15 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 16 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 17 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the first modification. FIG. 18 is a schematic diagram illustrating a configuration example of a contactless power transmission unit according to the second modification. FIG. 19 is a schematic diagram illustrating a configuration example of a non-contact power transmission unit according to the second modification. FIG. 20 is a schematic diagram illustrating a configuration example of a non-contact power transmission unit according to the third modification. FIG. 21 is a schematic diagram illustrating a configuration example of a non-contact power transmission unit according to the third modification.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the structures described below can be combined as appropriate. Various omissions, substitutions, or changes in the configuration can be made without departing from the scope of the present invention.

Embodiment
The non-contact power transmission unit 1 and the non-contact power transmission system 100 according to the embodiment will be described. The non-contact power transmission system 100 is a system that transmits power from a power source (not shown) in a non-contact manner. The non-contact power transmission system 100 is mounted on, for example, a vehicle and, as shown in FIG. 1, a non-contact power transmission unit 1a on the power transmission side that transmits power in a non-contact manner, and a non-contact power transmission unit 1a on the power transmission side. And a non-contact power transmission unit 1b on the power receiving side that receives the power transmitted from. The non-contact power transmission system 100 is installed so that the non-contact power transmission unit 1a on the power transmission side and the non-contact power transmission unit 1b on the power reception side face each other in the coil axis direction so that they can communicate and transmit power.

  The non-contact power transmission units 1a and 1b on the power transmission side and the power reception side include a communication coupler 20 provided on the reference line Za and a plurality of spiral coil portions 31 provided around the reference line Za, and are adjacent to each other. Current flows in the coil portions 31 in the opposite directions. As a result, the non-contact power transmission units 1a and 1b on the power transmission side and the power reception side can suppress the radiated magnetic field, and the communication coupler 20 can be provided in the center of the plurality of coil portions 31, so that the size of the unit is increased. Can be suppressed. Hereinafter, the non-contact power transmission units 1a and 1b on the power transmission side and the power reception side will be described in detail. Since the non-contact power transmission unit 1a on the power transmission side and the non-contact power transmission unit 1b on the power reception side have the same configuration, they are simply referred to as the non-contact power transmission unit 1 unless otherwise specified.

  The non-contact power transmission unit 1 is a unit that transmits power in a non-contact manner, and includes a substrate 10, a communication coupler 20 as a communication unit, and a power transmission coil 30. The substrate 10 is formed in a rectangular flat plate shape, and includes, for example, ferrite that is a magnetic body having high magnetic permeability.

  The communication coupler 20 is a device that transmits or receives a signal wirelessly. The communication coupler 20 performs wireless communication using, for example, TransferJet (registered trademark), which is a proximity wireless transfer technology. The communication coupler 20 is provided on a preset reference line Za. Here, the reference line Za is, for example, a line that passes through substantially the center of the substrate 10 perpendicularly to the mounting surface 11 of the substrate 10. As shown in FIG. 2, the communication coupler 20 is provided with a plurality of coil portions 31 to be described later around the communication coupler 20. A fixed interval is provided between the communication coupler 20 and each coil unit 31. Thereby, the communication coupler 20 and each coil part 31 can be electrically insulated. Further, it is possible to suppress the heat generated in each coil part 31 from being transmitted to the communication coupler 20. Therefore, it can suppress that the communication performance of the communication coupler 20 falls.

  The power transmission coil 30 is a coil that transmits power without contact. The power transmission coil 30 includes a plurality of coil portions 31, for example, four coil portions 31a to 31d (see FIG. 2). In the power transmission coil 30, the coil portions 31 a to 31 d are formed in a spiral shape around the coil axis Zb. Here, the coil axis Zb of each coil part 31a-31d is a straight line along the reference line Za. In the power transmission coil 30, the conducting wire is wound along an orthogonal direction orthogonal to the reference line Za (coil axis Zb), and the respective coil portions 31a to 31d are formed in a planar shape. In the power transmission coil 30, when viewed from the direction of the reference line Za, the coil portions 31a to 31d are formed in a rectangular shape and an equivalent size. In the power transmission coil 30, the coil part 31a and the coil part 31c are opposed to each other, and the coil part 31b and the coil part 31d are opposed to each other. When the power transmission coil 30 is viewed from the direction of the reference line Za, the shape of the outer periphery of the power transmission coil 30 is rectangular. In the power transmission coil 30, for example, each of the coil portions 31 a to 31 d is formed from a single conducting wire. That is, the power transmission coil 30 is formed with four spiral coil portions 31a to 31d by winding one conductive wire.

  In the power transmission coil 30, the coil portions 31a to 31d are provided around the reference line Za. For example, in the power transmission coil 30, the coil portions 31 a to 31 d are provided around the communication coupler 20 through which the reference line Za passes on the mounting surface 11 of the substrate 10. In other words, when the power transmission coil 30 is viewed from the direction along the reference line Za when the coil axis line Zb of each of the coil parts 31a to 31d is positioned so as to be shifted from the reference line Za, each coil part 31a is provided. ˜31d are adjacent to each other. For example, the power transmission coil 30 is adjacent in a direction in which the coil portions 31a to 31d intersect the reference line Za. Typically, in the power transmission coil 30, the coil portions 31a to 31d are adjacent to each other in the orthogonal direction orthogonal to the reference line Za.

  In the power transmission coil 30, the coil part 31a is adjacent to the coil part 31b, the coil part 31b is adjacent to the coil part 31c, the coil part 31c is adjacent to the coil part 31d, and the coil part 31d is adjacent to the coil part 31a. It is mounted on the mounting surface 11 in a state. When viewed from the mounting surface 11 side, the power transmission coil 30 is formed by winding one conductive wire clockwise from the outside to the inside to form the coil portion 31a, extending from the end of the coil portion 31a. An existing conducting wire is wound counterclockwise from the outside to the inside to form the coil portion 31b, and the conducting wire extending from the end of the coil portion 31b is wound clockwise from the outside to the inside. Thus, a coil part 31c is formed, and a coil part 31d is formed by winding a conducting wire extending from the end of the coil part 31c counterclockwise from the outside to the inside.

  As a result, in the power transmission coil 30, in the adjacent coil portions 31, one coil portion 31 and the other coil portion 31 flow in the opposite directions around the coil axis Zb. For example, when an even number of the plurality of coil portions 31 are provided, the power transmission coil 30 has one coil portion 31 and the other coil portion 31 centered on the coil axis Zb with respect to each other in the combination of all adjacent coil portions 31. Current flows in the reverse direction. For example, as shown in FIG. 3, when the power transmission coil 30 is viewed from the mounting surface 11 side, a clockwise current flows through the coil portion 31a, and a counterclockwise current flows through the coil portion 31b adjacent to the coil portion 31a. Flows, a clockwise current flows in the coil part 31c adjacent to the coil part 31b, and a counterclockwise current flows in the coil part 31d adjacent to the coil part 31c. As a result, in the power transmission coil 30, in each of the adjacent coil portions 31, one coil portion 31 and the other coil portion 31 have different magnetic field directions. For example, in the power transmission coil 30, the direction of the magnetic field generated in the coil part 31a is opposite to the direction of the magnetic field generated in the coil part 31b adjacent to the coil part 31a. The direction is opposite to the direction of the magnetic field generated in the coil part 31c adjacent to the coil part 31b, and the direction of the magnetic field generated in the coil part 31c is generated in the coil part 31d adjacent to the coil part 31c. The direction of the magnetic field is opposite. Thereby, since the direction of a magnetic field is mutually reverse in the coil part 31 adjacent to the power transmission coil 30, it can suppress the radiation magnetic field of the arrangement direction (direction perpendicular to the reference line Za) of the coil part 31 (cancellation). it can). FIG. 4 shows a power transmission coil as a comparative example formed by conducting wires having the same length, and the radiation magnetic field of the power transmission coil having the same direction of the magnetic field of adjacent coil portions and the power transmission coil 30 of the embodiment. It is the example which compared. According to FIG. 4, the power transmission coil 30 of the embodiment has a radiated magnetic field suppressed by about 10 dB compared to the power transmission coil of the comparative example. The radiation magnetic field according to the embodiment is a value measured at a position about 30 cm away from the outer periphery of the power transmission coil 30. Similarly, the radiation magnetic field which concerns on a comparative example is the value measured in the position about 30 cm away from the outer peripheral part of the power transmission coil of a comparative example.

  As described above, the non-contact power transmission unit 1 and the non-contact power transmission system 100 according to the embodiment include the communication coupler 20 provided on the reference line Za and a plurality of spiral coils provided around the reference line Za. Part 31 and the adjacent coil part 31 flows in the opposite direction to each other. Thereby, in the non-contact power transmission unit 1 and the non-contact power transmission system 100, since the direction of the current flowing through the adjacent coil portions 31 is reversed, the direction of the magnetic field of the adjacent coil portions 31 is reversed. Therefore, the non-contact power transmission unit 1 and the non-contact power transmission system 100 can suppress (cancel) the radiated magnetic field in the direction in which the coil portions 31a to 31d are arranged (the direction perpendicular to the reference line Za). Thereby, the non-contact power transmission unit 1 and the non-contact power transmission system 100 can suppress the radiation magnetic field from affecting the communication coupler 20 and other devices around. Therefore, the non-contact power transmission unit 1 and the non-contact power transmission system 100 can suppress the increase in size of the unit because the communication coupler 20 can be provided at the center of the plurality of coil portions 31. In the non-contact power transmission unit 1 and the non-contact power transmission system 100, the communication coupler 20 maintains the center position of the power transmission coil 30 even when the non-contact power transmission unit 1 is rotated around the reference line Za. Therefore, alignment with the counterpart communication coupler 20 is facilitated, and the installation property of the contact power transmission unit 1 can be improved.

  In the non-contact power transmission unit 1, the plurality of coil portions 31 are formed by winding one conductive wire along a direction orthogonal to the reference line Za. Thereby, the non-contact electric power transmission unit 1 can flow an electric current through each coil part 31a-31d by flowing an electric current through one conducting wire.

  In the non-contact power transmission unit 1, the plurality of coil portions 31 are adjacent to each other in a direction intersecting the reference line Za. Thereby, the non-contact electric power transmission unit 1 can provide each coil part 31a-31d, without each coil part 31a-31d overlapping in the direction of the reference line Za.

  Further, in the non-contact power transmission unit 1, the plurality of coil portions 31 are adjacent to each other when the coil axis lines Zb are shifted from the reference line Za and viewed from the direction along the reference line Za. . Thereby, since the non-contact power transmission unit 1 can be provided with the coil portions 31 a to 31 d around the communication coupler 20, the size of the unit can be suppressed.

  Further, in the non-contact power transmission unit 1, the power transmission coil 30 is provided with an even number of a plurality of coil parts 31, and one coil part 31 and the other coil part 31 are arranged in a combination of all adjacent coil parts 31. Currents flow in the opposite directions around the coil axis Zb. Thereby, since the direction of a magnetic field turns into a reverse direction in the combination of all the adjacent coil parts 31, the non-contact electric power transmission unit 1 can suppress a radiation magnetic field effectively.

[Modification 1]
Next, Modification 1 of the embodiment will be described. The non-contact power transmission units 1 </ b> A to 1 </ b> M according to the modified example 1 are formed from one conductive wire having the same length as that of the power transmission coil 30 according to the embodiment, and the shape and number of each coil portion are different. In the power transmission coils 30 </ b> A to 30 </ b> M, each coil portion is formed in a spiral shape around the coil axis Zb. The power transmission coils 30 </ b> A to 30 </ b> M are formed in a planar shape in which one conductive wire is wound along an orthogonal direction orthogonal to the reference line Za (coil axis Zb). In the power transmission coils 30A to 30M, each coil portion is provided around the reference line Za. For example, each of the power transmission coils 30 </ b> A to 30 </ b> M is provided with each coil portion on the mounting surface 11 of the substrate 10 around the communication coupler 20. In other words, the power transmission coils 30 </ b> A to 30 </ b> M are positioned so that the coil axis Zb of each coil part is shifted from the reference line Za and the coil parts are mutually connected when viewed from the direction along the reference line Za. Adjacent to. The power transmission coils 30 </ b> A to 30 </ b> M are adjacent to each other in a direction in which each coil portion intersects the reference line Za. Typically, the power transmission coils 30 </ b> A to 30 </ b> M are adjacent to each other in the orthogonal direction in which the coil portions are orthogonal to the reference line Za. In addition, the non-contact power transmission units 1A to 1M according to the modification 1 schematically illustrate the shapes of the power transmission coils 30A to 30M, and a description common to the embodiment is omitted.

  For example, in the non-contact power transmission unit 1A shown in FIG. 5, the power transmission coil 30A is formed by winding one conductive wire to form two spiral coil portions 32a and 32b. In the power transmission coil 30A, the coil portions 32a and 32b are formed in a rectangular shape and the same size, and the coil portion 32a and the coil portion 32b are opposed to each other. When viewed from the direction of the reference line Za, the outer shape of the power transmission coil 30A is rectangular. The power transmission coil 30A is mounted on the mounting surface 11 with the coil portion 32a and the coil portion 32b being adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30A has a coil portion 32a formed by winding one conductive wire clockwise, and the conductive wire extending from the end of the coil portion 32a is counterclockwise. The coil portion 32b is formed by being wound around.

  Thereby, when the power transmission coil 30A is viewed from the mounting surface 11, the clockwise current flows in the coil portion 32a and the counterclockwise current flows in the coil portion 32b. As a result, in the power transmission coil 30A, the direction of the magnetic field generated in the coil part 32a is opposite to the direction of the magnetic field generated in the coil part 32b. Accordingly, in the power transmission coil 30A, the directions of the magnetic fields are opposite to each other in the adjacent coil portions 32a and 32b, and therefore, the radiation in the direction in which the coil portions 32a and 32b are arranged (direction perpendicular to the reference line Za). The magnetic field can be suppressed (can be canceled). Thereby, the power transmission coil 30 </ b> A can suppress a radiating magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1B shown in FIG. 6, the power transmission coil 30B is formed with eight spiral coil portions 33a to 33h by winding one conductive wire. In the power transmission coil 30B, the coil portions 33a to 33h are rectangular and have the same size. When the power transmission coil 30B is viewed from the direction of the reference line Za, the outer periphery of the power transmission coil 30B has a rectangular shape. In the power transmission coil 30 </ b> B, three coil portions 33 a to 33 h are arranged vertically and horizontally along the circumferential direction of the outer periphery. As shown in FIG. 6, the power transmission coil 30 </ b> B is mounted on the mounting surface 11 so that the coil portions 33 a to 33 h are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30B has a coil portion 33a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 33a is a watch. A coil portion 33b is formed by being wound around, and a coil portion 33c is formed by winding a conductive wire extending from the end portion of the coil portion 33b counterclockwise, and an end portion of the coil portion 33c. A coil portion 33d is formed by winding a conductive wire extending from the coil clockwise, and a coil portion 33e is formed by winding a conductive wire extending from the end of the coil portion 33d counterclockwise. The conductive wire extending from the end portion of the coil portion 33e is wound clockwise to form the coil portion 33f, and the conductive wire extending from the end portion of the coil portion 33f is wound counterclockwise. 33g formed And which, conductors extending from the end portion of the coil portion 33g is formed wound a coil portion 33h in the clockwise direction.

  As a result, when the power transmission coil 30B is viewed from the mounting surface 11, the coil portions 33a, 33c, 33e, and 33g have counterclockwise currents, and the coil portions 33b, 33d, 33f, and 33h have clockwise currents. Flows. As a result, in the power transmission coil 30B, the direction of the magnetic field generated in the coil part 33a is opposite to the direction of the magnetic field generated in the coil part 33b, and the direction of the magnetic field generated in the coil part 33b is generated in the coil part 33c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 33c is opposite to the direction of the magnetic field generated in the coil part 33d, and the direction of the magnetic field generated in the coil part 33d and the coil part 33e are reversed. The direction of the magnetic field generated in the coil part 33e is reversed, the direction of the magnetic field generated in the coil part 33e and the direction of the magnetic field generated in the coil part 33f are reversed, and the direction of the magnetic field generated in the coil part 33f and the coil The direction of the magnetic field generated in the part 33g is reversed, the direction of the magnetic field generated in the coil part 33g and the direction of the magnetic field generated in the coil part 33h are reversed, and the coil part 33h And the direction of the magnetic field generated in the raw to the direction of the magnetic field and the coil portion 33a is opposite. Thereby, since the direction of a magnetic field turns into mutually reverse direction in each coil part 33a-33h adjacent to the power transmission coil 30B, the radiation magnetic field of the arrangement direction of each coil part 33a-33h can be suppressed. Thereby, the power transmission coil 30 </ b> B can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1C shown in FIG. 7, the power transmission coil 30C is formed with two spiral coil portions 34a and 34b by winding one conductive wire. In the power transmission coil 30C, the coil portions 34a and 34b are formed in a triangular shape and the same size, and the coil portion 34a and the coil portion 34b are opposed to each other. When the power transmission coil 30C is viewed from the direction of the reference line Za, the shape of the outer periphery of the power transmission coil 30C is rectangular. The power transmission coil 30C is mounted on the mounting surface 11 with the coil portion 34a and the coil portion 34b being adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30C has a coil portion 34a formed by winding one lead wire clockwise, and the lead wire extending from the end of the coil portion 34a is counterclockwise. The coil part 34b is formed by being wound around.

  Accordingly, when viewed from the mounting surface 11 side, the power transmission coil 30C has a clockwise current flowing in the coil portion 34a and a counterclockwise current flowing in the coil portion 34b. As a result, in the power transmission coil 30C, the direction of the magnetic field generated in the coil part 34a is opposite to the direction of the magnetic field generated in the coil part 34b. As a result, in the power transmission coil 30C, the directions of the magnetic fields in the adjacent coil portions 34a and 34b are opposite to each other, so that the radiation magnetic field in the arrangement direction of the coil portions 34a and 34b can be suppressed. Thereby, the power transmission coil 30 </ b> C can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1D shown in FIG. 8, the power transmission coil 30D is formed with four spiral coil portions 35a to 35d by winding one conductive wire. As for power transmission coil 30D, each coil part 35a-35d is trapezoid shape, and is formed in the equivalent size. When viewed from the direction of the reference line Za, the outer shape of the power transmission coil 30D is a rectangular shape. In the power transmission coil 30D, the coil part 35a and the coil part 35c face each other, and the coil part 35b and the coil part 35d face each other. As shown in FIG. 8, the power transmission coil 30 </ b> D is mounted on the mounting surface 11 so that the coil portions 35 a to 35 d are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30D has a coil portion 35a formed by winding one conductive wire clockwise, and the conductive wire extending from the end of the coil portion 35a is counterclockwise. A coil portion 35b is formed by being wound around, and a coil wire 35c is formed by winding a conductive wire extending from the end portion of the coil portion 35b in a clockwise direction, from the end portion of the coil portion 35c. The extending conducting wire is wound counterclockwise to form a coil portion 35d.

  Accordingly, when viewed from the mounting surface 11 side, the power transmission coil 30D has a clockwise current flowing through the coil portions 35a and 35c, and a counterclockwise current flows through the coil portions 35b and 35d. As a result, in the power transmission coil 30D, the direction of the magnetic field generated in the coil part 35a is opposite to the direction of the magnetic field generated in the coil part 35b, and the direction of the magnetic field generated in the coil part 35b and the direction of the magnetic field generated in the coil part 35c are generated. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 35c is opposite to the direction of the magnetic field generated in the coil part 35d, and the direction of the magnetic field generated in the coil part 35d and the coil part 35a are reversed. The direction of the magnetic field generated in the reverse direction. Thereby, since the direction of a magnetic field turns into mutually reverse direction in each coil part 35a-35d which adjoins electric power transmission coil 30D, the radiation magnetic field of the arrangement direction of each coil part 35a-35d can be suppressed. As a result, the power transmission coil 30 </ b> D can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1E shown in FIG. 9, the power transmission coil 30E is formed with eight spiral coil portions 36a to 36h by winding one conductive wire. In the power transmission coil 30E, each of the coil portions 36a to 36h has a trapezoidal shape and is formed in an equivalent size. When the power transmission coil 30E is viewed from the direction of the reference line Za, the shape of the outer periphery of the power transmission coil 30E is rectangular. In the power transmission coil 30E, the coil portions 36a to 36h are arranged along the circumferential direction of the outer periphery. As shown in FIG. 9, the power transmission coil 30E is mounted on the mounting surface 11 so that the coil portions 36a to 36h are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30E has a coil portion 36a formed by winding one conductive wire clockwise, and the conductive wire extending from the end of the coil portion 36a is counterclockwise. A coil portion 36b is formed by being wound around, and a coil wire 36c is formed by winding a conductive wire extending from the end portion of the coil portion 36b in a clockwise direction, from the end portion of the coil portion 36c. The extending conducting wire is wound counterclockwise to form a coil portion 36d, and the extending conducting wire from the end of the coil portion 36d is wound clockwise to form a coil portion 36e. The conducting wire extending from the end of the coil portion 36e is wound counterclockwise to form the coil portion 36f, and the conducting wire extending from the end of the coil portion 36f is wound clockwise to form the coil portion. 36g formed Cage, are formed coil portion 36h conductor extending from an end portion of the coil portion 36g is wound counterclockwise.

  As a result, when the power transmission coil 30E is viewed from the mounting surface 11, the coils 36a, 36c, 36e, and 36g flow clockwise, and the coils 36b, 36d, 36f, and 36h are counterclockwise. Current flows. As a result, in the power transmission coil 30E, the direction of the magnetic field generated in the coil part 36a is opposite to the direction of the magnetic field generated in the coil part 36b, and the direction of the magnetic field generated in the coil part 36b and the direction of the magnetic field generated in the coil part 36c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 36c is opposite to the direction of the magnetic field generated in the coil part 36d, and the direction of the magnetic field generated in the coil part 36d and the coil part 36e are reversed. The direction of the magnetic field generated in the coil portion 36e is opposite to the direction of the magnetic field generated in the coil portion 36e, and the direction of the magnetic field generated in the coil portion 36f is reversed. The direction of the magnetic field generated in the part 36g is reversed, the direction of the magnetic field generated in the coil part 36g is opposite to the direction of the magnetic field generated in the coil part 36h, and the coil part 36h And the direction of the magnetic field generated in the raw to the direction of the magnetic field and the coil portion 36a is opposite. Thereby, since the direction of a magnetic field turns into mutually reverse direction in each coil part 36a-36h adjacent to the electric power transmission coil 30E, it can suppress the radiation magnetic field of the arrangement direction of each coil part 36a-36h. Thereby, the power transmission coil 30 </ b> E can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1F shown in FIG. 10, the power transmission coil 30F is formed with four spiral coil portions 37a to 37d by winding one conductive wire. In the power transmission coil 30F, each of the coil portions 37a to 37d is formed in a rectangular shape and includes different sizes. In the power transmission coil 30F, the coil part 37a and the coil part 37c having the same shape are opposed to each other, and the coil part 37b and the coil part 37d having the same shape are opposed to each other. When the power transmission coil 30F is viewed from the direction of the reference line Za, the outer periphery of the power transmission coil 30F has a rectangular shape. As shown in FIG. 10, the power transmission coil 30 </ b> F is mounted on the mounting surface 11 so that the coil portions 37 a to 37 d are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30F has a coil portion 37a formed by winding one conductive wire clockwise, and the conductive wire extending from the end of the coil portion 37a is counterclockwise. The coil portion 37b is formed by being wound around, and the coil portion 37c is formed by winding the conductive wire extending from the end portion of the coil portion 37b in the clockwise direction, from the end portion of the coil portion 37c. The extending conducting wire is wound counterclockwise to form a coil portion 37d.

  Accordingly, when viewed from the mounting surface 11 side, the power transmission coil 30F has a clockwise current flowing through the coil portions 37a and 37c, and a counterclockwise current flows through the coil portions 37b and 37d. As a result, in the power transmission coil 30F, the direction of the magnetic field generated in the coil part 37a is opposite to the direction of the magnetic field generated in the coil part 37b, and the direction of the magnetic field generated in the coil part 37b and the direction of the magnetic field generated in the coil part 37c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 37c is opposite to the direction of the magnetic field generated in the coil part 37d, and the direction of the magnetic field generated in the coil part 37d and the coil part 37a are reversed. The direction of the magnetic field generated in the reverse direction. Thereby, since the direction of a magnetic field is mutually reverse in each coil part 37a-37d adjacent to the electric power transmission coil 30F, it can suppress the radiation magnetic field of the arrangement direction of each coil part 37a-37d. Thereby, the power transmission coil 30 </ b> F can suppress the radiation magnetic field that affects the communication coupler 20.

  In the non-contact power transmission unit 1G shown in FIG. 11, the power transmission coil 30G is formed with 12 spiral coil portions 38a to 38m by winding one conductive wire. In the power transmission coil 30G, each of the coil portions 38a to 38m has a rectangular shape or a triangular shape, and is formed in an equal size in the same shape. When the power transmission coil 30G is viewed from the direction of the reference line Za, the outer periphery of the power transmission coil 30G has a rectangular shape. In the power transmission coil 30G, the coil portions 38a to 38m are arranged along the circumferential direction of the outer periphery. For example, as illustrated in FIG. 11, the power transmission coil 30 </ b> G is mounted on the mounting surface 11 so that the coil portions 38 a to 38 m are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30G has a coil portion 38a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 38a is a watch. A coil portion 38b is formed by being wound around, and a conductive wire extending from the end portion of the coil portion 38b is wound counterclockwise to form a coil portion 38c. The end portion of the coil portion 38c A coil wire 38d is formed by winding a conductive wire extending from the coil clockwise, and a coil portion 38e is formed by winding a conductive wire extending from the end of the coil portion 38d counterclockwise. The conductive wire extending from the end portion of the coil portion 38e is wound clockwise to form the coil portion 38f, and the conductive wire extending from the end portion of the coil portion 38f is wound counterclockwise. 38g formed The coil extending from the end of the coil part 38g is wound clockwise to form the coil part 38h, and the conductor extending from the end of the coil part 38h is wound counterclockwise. The coil portion 38i is formed, the conductive wire extending from the end portion of the coil portion 38i is wound clockwise to form the coil portion 38j, and the conductive wire extending from the end portion of the coil portion 38j is A coil portion 38k is formed by being wound counterclockwise, and a coil portion 38m is formed by winding a conductive wire extending from the end of the coil portion 38k in a clockwise direction.

  Thereby, when the power transmission coil 30G is viewed from the mounting surface 11, the coil portions 38a, 38c, 38e, 38g, 38i, and 38k have counterclockwise currents flowing, and the coil portions 38b, 38d, 38f, 38h, A clockwise current flows through 38j and 38m.

  As a result, in the power transmission coil 30G, the direction of the magnetic field generated in the coil part 38a is opposite to the direction of the magnetic field generated in the coil part 38b, and the direction of the magnetic field generated in the coil part 38b and the direction of the magnetic field generated in the coil part 38c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil unit 38c is opposite to the direction of the magnetic field generated in the coil unit 38d, and the direction of the magnetic field generated in the coil unit 38d and the coil unit 38e. The direction of the magnetic field generated in the coil part 38e is reversed, the direction of the magnetic field generated in the coil part 38e and the direction of the magnetic field generated in the coil part 38f are reversed, and the direction of the magnetic field generated in the coil part 38f and the coil The direction of the magnetic field generated in the portion 38g is reversed, the direction of the magnetic field generated in the coil portion 38g is opposite to the direction of the magnetic field generated in the coil portion 38h, and the coil portion 38h The direction of the generated magnetic field is opposite to the direction of the magnetic field generated in the coil part 38i, the direction of the magnetic field generated in the coil part 38i is opposite to the direction of the magnetic field generated in the coil part 38j, and the coil part The direction of the magnetic field generated in 38j and the direction of the magnetic field generated in the coil part 38k are reversed, the direction of the magnetic field generated in the coil part 38k and the direction of the magnetic field generated in the coil part 38m are reversed, The direction of the magnetic field generated in the coil part 38m is opposite to the direction of the magnetic field generated in the coil part 38a. Thereby, since the direction of a magnetic field turns into mutually reverse direction in each coil part 38a-38m adjacent to the power transmission coil 30G, the radiation magnetic field of the arrangement direction of each coil part 38a-38m can be suppressed. Thereby, the power transmission coil 30 </ b> G can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1H shown in FIG. 12, the power transmission coil 30H is formed with eight spiral coil portions 39a to 39h by winding one conductive wire. In the power transmission coil 30H, each of the coil portions 39a to 39h has a triangular shape or a trapezoidal shape, and is formed in an equivalent size in the same shape. When viewed from the direction of the reference line Za, the outer shape of the power transmission coil 30H is rectangular. In the power transmission coil 30H, the coil portions 39a to 39h are alternately arranged with triangular coil portions 39a and the like and trapezoidal coil portions 39b and the like along the circumferential direction of the outer periphery. For example, as shown in FIG. 12, the power transmission coil 30H is mounted on the mounting surface 11 so that the coil portions 39a to 39h are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30H has a coil portion 39a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 39a is a watch. A coil part 39b is formed by being wound around, and a coil part 39c is formed by winding a conductive wire extending from the end part of the coil part 39b counterclockwise, and an end part of the coil part 39c. A coil portion 39d is formed by winding a conducting wire extending from the coil clockwise, and a coil portion 39e is formed by winding a conducting wire extending from the end of the coil portion 39d counterclockwise. The conductive wire extending from the end of the coil portion 39e is wound clockwise to form a coil portion 39f, and the conductive wire extending from the end of the coil portion 39f is wound counterclockwise. Part 39g is formed And which, conductors extending from the end portion of the coil portion 39g is formed wound a coil portion 39h in the clockwise direction.

  As a result, when the power transmission coil 30H is viewed from the mounting surface 11, the coil portions 39a, 39c, 39e, and 39g have counterclockwise currents, and the coil portions 39b, 39d, 39f, and 39h have clockwise currents. Flows. As a result, in the power transmission coil 30H, the direction of the magnetic field generated in the coil part 39a is opposite to the direction of the magnetic field generated in the coil part 39b, and the direction of the magnetic field generated in the coil part 39b is generated in the coil part 39c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 39c is opposite to the direction of the magnetic field generated in the coil part 39d, and the direction of the magnetic field generated in the coil part 39d and the coil part 39e are reversed. The direction of the magnetic field generated in the coil part 39e is opposite to the direction of the magnetic field generated in the coil part 39e and the direction of the magnetic field generated in the coil part 39f is reversed, and the direction of the magnetic field generated in the coil part 39f and the coil The direction of the magnetic field generated in the part 39g is reversed, the direction of the magnetic field generated in the coil part 39g is opposite to the direction of the magnetic field generated in the coil part 39h, and the coil part 39h And the direction of the magnetic field generated in the raw to the direction of the magnetic field and the coil portion 39a is opposite. Thereby, since the direction of a magnetic field is mutually reverse in each coil part 39a-39h which adjoins the power transmission coil 30H, the radiation magnetic field of the arrangement direction of each coil part 39a-39h can be suppressed. Thereby, the power transmission coil 30 </ b> H can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1I shown in FIG. 13, the power transmission coil 30I is formed with two spiral coil portions 310a and 310b by winding one conductive wire. In the power transmission coil 30I, the coil portions 310a and 310b are formed in a semicircular shape and the same size, and the coil portion 310a and the coil portion 310b face each other. When the power transmission coil 30I is viewed from the direction of the reference line Za, the outer periphery of the power transmission coil 30I has a circular shape. The power transmission coil 30I is mounted on the mounting surface 11 with the coil portion 310a and the coil portion 310b being adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30I has a coil portion 310a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 310a is a watch. The coil part 310b is formed by being wound around.

  Thereby, when the power transmission coil 30I is viewed from the mounting surface 11, the counterclockwise current flows through the coil portion 310a, and the clockwise current flows through the coil portion 310b. As a result, in the power transmission coil 30I, the direction of the magnetic field generated in the coil part 310a is opposite to the direction of the magnetic field generated in the coil part 310b. Thereby, in the power transmission coil 30I, the directions of the magnetic fields in the adjacent coil portions 310a and 310b are opposite to each other, so that the radiation magnetic field in the direction in which the coil portions 310a and 310b are arranged can be suppressed. Thereby, the power transmission coil 30I can suppress the radiation magnetic field that affects the communication coupler 20.

  In the non-contact power transmission unit 1J shown in FIG. 14, the power transmission coil 30J is wound with one conductive wire to form four spiral coil portions 320a to 320d. In the power transmission coil 30J, each of the coil portions 320a to 320d is formed in a fan shape and an equivalent size, the coil portion 320a and the coil portion 320c face each other, and the coil portion 320b and the coil portion 320d face each other. When the power transmission coil 30J is viewed from the direction of the reference line Za, the outer periphery of the power transmission coil 30J has a circular shape. As shown in FIG. 14, the power transmission coil 30 </ b> J is mounted on the mounting surface 11 so that the coil portions 320 a to 320 d are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30J has a coil portion 320a formed by winding one lead wire clockwise, and the lead wire extending from the end of the coil portion 320a is counterclockwise. A coil portion 320b is formed by being wound around, and a coil wire 320c is formed by winding a conductive wire extending from the end portion of the coil portion 320b in a clockwise direction, from the end portion of the coil portion 320c. The extending conducting wire is wound counterclockwise to form a coil portion 320d.

  Thus, when viewed from the mounting surface 11 side, the power transmission coil 30J has a clockwise current flowing through the coil portions 320a and 320c, and a counterclockwise current flows through the coil portions 320b and 320d. As a result, in the power transmission coil 30J, the direction of the magnetic field generated in the coil part 320a is opposite to the direction of the magnetic field generated in the coil part 320b, and the direction of the magnetic field generated in the coil part 320b is generated in the coil part 320c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 320c is opposite to the direction of the magnetic field generated in the coil part 320d, and the direction of the magnetic field generated in the coil part 320d and the coil part 320a are reversed. The direction of the magnetic field generated in the reverse direction. Thereby, since the direction of a magnetic field is mutually reverse in each coil part 320a-320d adjacent to the power transmission coil 30J, the radiation magnetic field of the arrangement direction of each coil part 320a-320d can be suppressed. Thereby, the power transmission coil 30J can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1K shown in FIG. 15, the power transmission coil 30K is formed with eight spiral coil portions 330a to 330h by winding one conductive wire. In the power transmission coil 30K, the coil portions 330a to 330h are formed in a fan shape and an equivalent size. When the power transmission coil 30K is viewed from the direction of the reference line Za, the outer periphery of the power transmission coil 30K has a circular shape. In the power transmission coil 30K, the coil portions 330a to 330h are arranged along the circumferential direction of the outer periphery. As shown in FIG. 15, the power transmission coil 30 </ b> K is mounted on the mounting surface 11 such that the coil portions 330 a to 330 h are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30K has a coil portion 330a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 330a is a watch. A coil portion 330b is formed by being wound around, and a coil wire 330c is formed by winding a conductive wire extending from the end portion of the coil portion 330b counterclockwise, and an end portion of the coil portion 330c. A coil portion 330d is formed by winding a conducting wire extending from the coil clockwise, and a coil portion 330e is formed by winding a conducting wire extending from the end of the coil portion 330d counterclockwise. The conducting wire extending from the end of the coil portion 330e is wound clockwise to form the coil portion 330f, and the conducting wire extending from the end of the coil portion 330f is wound counterclockwise. Coil portion 330g is formed, wires extending from the end portion of the coil portion 330g is formed wound a coil portion 330h clockwise.

  As a result, when the power transmission coil 30K is viewed from the mounting surface 11, the coil portions 330a, 330c, 330e, and 330g have counterclockwise currents, and the coil portions 330b, 330d, 330f, and 330h have clockwise currents. Flows. As a result, in the power transmission coil 30K, the direction of the magnetic field generated in the coil part 330a is opposite to the direction of the magnetic field generated in the coil part 330b, and the direction of the magnetic field generated in the coil part 330b is generated in the coil part 330c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 330c is opposite to the direction of the magnetic field generated in the coil part 330d, and the direction of the magnetic field generated in the coil part 330d and the coil part 330e are reversed. The direction of the magnetic field generated in the coil part 330e is reversed, the direction of the magnetic field generated in the coil part 330e and the direction of the magnetic field generated in the coil part 330f are reversed, and the direction of the magnetic field generated in the coil part 330f and the coil The direction of the magnetic field generated in the part 330g is opposite, and the direction of the magnetic field generated in the coil part 330g is opposite to the direction of the magnetic field generated in the coil part 330h. Worried, and the direction of the magnetic field generated in the magnetic field direction and the coil unit 330a generated in the coil portion 330h is opposite. Thereby, since the direction of a magnetic field is mutually reverse in each coil part 330a-330h adjacent to the power transmission coil 30K, the radiation magnetic field of the arrangement direction of each coil part 330a-330h can be suppressed. Thereby, the power transmission coil 30 </ b> K can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1L shown in FIG. 16, the power transmission coil 30L is formed with three spiral coil portions 340a to 340c by winding one conductive wire. In the power transmission coil 30L, the coil portions 340a to 340c are formed in a diamond shape and an equivalent size. When viewed from the direction of the reference line Za, the power transmission coil 30L has a polygonal outer shape, for example, a regular hexagonal shape. In the power transmission coil 30L, the coil portions 340a to 340c are arranged so that the outer periphery has a regular hexagonal shape. As shown in FIG. 16, the power transmission coil 30 </ b> L is mounted on the mounting surface 11 so that the coil portions 340 a to 340 c are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30L has a coil portion 340a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 340a is a watch. A coil portion 340b is formed by being wound around, and a conductive wire extending from the end of the coil portion 340b is wound clockwise to form a coil portion 340c.

  Thereby, when the power transmission coil 30L is viewed from the mounting surface 11 side, a counterclockwise current flows through the coil portion 340a, and a clockwise current flows through the coil portions 340b and 340c. As a result, in the power transmission coil 30L, the direction of the magnetic field generated in the coil unit 340a is opposite to the direction of the magnetic field generated in the coil unit 340b, and the direction of the magnetic field generated in the coil unit 340b and the direction of the magnetic field generated in the coil unit 340c are generated. The direction of the magnetic field to be generated is the same direction, and the direction of the magnetic field generated in the coil unit 340c is opposite to the direction of the magnetic field generated in the coil unit 340a. Thereby, in the power transmission coil 30L, the directions of the magnetic fields are opposite to each other in the adjacent coil portions 340a and 340b, and in the coil portions 340a and 340c, so that the radiation in the arrangement direction of the coil portions 340a to 340c is performed. The magnetic field can be suppressed. Thereby, the power transmission coil 30L can suppress the radiation magnetic field that affects the communication coupler 20.

  In the non-contact power transmission unit 1M shown in FIG. 17, the power transmission coil 30M is formed with six spiral coil portions 350a to 350f by winding one conductive wire. In the power transmission coil 30M, the coil portions 350a to 350f are formed in a triangular shape and an equivalent size. When viewed from the direction of the reference line Za, the power transmission coil 30M has a polygonal outer shape, for example, a regular hexagonal shape. In the power transmission coil 30M, the coil portions 350a to 350f are arranged along the circumferential direction of the outer periphery. As shown in FIG. 17, the power transmission coil 30M is mounted on the mounting surface 11 such that the coil portions 350a to 350f are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30M has a coil portion 350a formed by winding one conductive wire counterclockwise, and the conductive wire extending from the end of the coil portion 350a is a watch. A coil portion 350b is formed by being wound around, and a coil portion 350c is formed by winding a conductive wire extending from an end portion of the coil portion 350b counterclockwise, and an end portion of the coil portion 350c. A coil portion 350d is formed by winding a conducting wire extending from the coil clockwise, and a coil portion 350e is formed by winding a conducting wire extending from the end of the coil portion 350d counterclockwise. A conductive wire extending from the end of the coil portion 350e is wound clockwise to form a coil portion 350f.

  As a result, when the power transmission coil 30M is viewed from the mounting surface 11, the coil portions 350a, 350c, and 350e flow counterclockwise current, and the coil portions 350b, 350d, and 350f flow clockwise current. As a result, in the power transmission coil 30M, the direction of the magnetic field generated in the coil part 350a is opposite to the direction of the magnetic field generated in the coil part 350b, and the direction of the magnetic field generated in the coil part 350b is generated in the coil part 350c. The direction of the magnetic field generated is reversed, the direction of the magnetic field generated in the coil part 350c and the direction of the magnetic field generated in the coil part 350d are reversed, and the direction of the magnetic field generated in the coil part 350d and the coil part 350e. The direction of the magnetic field generated in the coil part 350e is reversed, the direction of the magnetic field generated in the coil part 350e and the direction of the magnetic field generated in the coil part 350f are reversed, and the direction of the magnetic field generated in the coil part 350f and the coil The direction of the magnetic field generated in the portion 350a is opposite. Thereby, since the direction of a magnetic field is mutually reverse in each coil part 350a-350f adjacent to the power transmission coil 30M, the radiation magnetic field of the arrangement direction of each coil part 350a-350f can be suppressed. Thereby, the power transmission coil 30 </ b> M can suppress the radiation magnetic field that affects the communication coupler 20.

[Modification 2]
Next, a second modification of the embodiment will be described. The non-contact power transmission units 1N and 1P according to the modified example 2 are formed from one conductive wire having the same length as that of the power transmission coil 30 according to the embodiment, and the shape and number of each coil portion are different. In the power transmission coils 30N and 30P, each coil portion is formed in a spiral shape around the coil axis Zb. The power transmission coils 30N and 30P are formed in a planar shape in which one conductive wire is wound along an orthogonal direction orthogonal to the reference line Za (coil axis Zb). Each of the power transmission coils 30N and 30P is provided around the reference line Za. For example, each of the power transmission coils 30N and 30P is provided with a coil portion on the mounting surface 11 around the communication coupler 20 through which the reference line Za passes. In other words, in the power transmission coils 30N and 30P, the plurality of coil portions are annularly formed with different sizes, and the respective coil axis lines Zb are positioned coaxially with the reference line Za. When viewed from the direction along the reference line Za, the plurality of coil portions have one coil portion located on the inner side and the other coil portion located on the outer side in adjacent coil portions. The power transmission coils 30N and 30P are adjacent to each other in a direction in which each coil portion intersects the reference line Za. Typically, the power transmission coils 30N and 30P are adjacent to each other in the orthogonal direction in which the coil portions are orthogonal to the reference line Za. In addition, the non-contact power transmission units 1N and 1P according to the modification 2 schematically illustrate the shapes of the power transmission coils 30N and 30P, and a description common to the embodiment is omitted.

  For example, in the non-contact power transmission unit 1N shown in FIG. 18, the power transmission coil 30N is formed with two spiral coil portions 360a and 360b by winding one conductive wire. In the power transmission coil 30N, the coil axis lines Zb of the coil portions 360a and 360b are positioned coaxially with the reference line Za. In the power transmission coil 30N, each of the coil portions 360a and 360b is formed in a rectangular ring shape, and is formed in different sizes. For example, in the power transmission coil 30N, the coil part 360a is formed smaller than the coil part 360b, and the coil part 360a is located inside the coil part 360b. In the power transmission coil 30N, the communication coupler 20 is located inside the coil portion 360a. When the power transmission coil 30N is viewed from the direction of the reference line Za, the shape of the outer periphery of the power transmission coil 30N is rectangular. The power transmission coil 30N is mounted on the mounting surface 11 with the coil portion 360a and the coil portion 360b being adjacent to each other on the inner side and the outer side. When viewed from the mounting surface 11 side, the power transmission coil 30N has a coil portion 360a formed by winding one conductive wire clockwise, and the conductive wire extending from the end of the coil portion 360a is counterclockwise. The coil part 360b is formed by being wound around.

  Thus, when viewed from the mounting surface 11 side, the power transmission coil 30N has a clockwise current flowing in the coil portion 360a and a counterclockwise current flowing in the coil portion 360b. As a result, in the power transmission coil 30N, the direction of the magnetic field generated in the coil part 360a is opposite to the direction of the magnetic field generated in the coil part 360b. Thereby, in the power transmission coil 30N, since the directions of the magnetic fields are opposite to each other in the adjacent coil portions 360a and 360b, the radiation magnetic field in the arrangement direction of the coil portions 360a and 360b can be suppressed. Thereby, the power transmission coil 30N can suppress the radiation magnetic field that affects the communication coupler 20.

  In the non-contact power transmission unit 1P shown in FIG. 19, the power transmission coil 30P is formed with four spiral coil portions 370a to 370d by winding one conductive wire. In the power transmission coil 30P, the coil axis lines Zb of the coil portions 370a to 370d are positioned coaxially with the reference line Za. In the power transmission coil 30P, the coil portions 370a to 370d are formed in a rectangular ring shape and are formed in different sizes. For example, in the power transmission coil 30P, the coil part 370a is formed smaller than the coil part 370b, the coil part 370b is formed smaller than the coil part 370c, and the coil part 370c is formed smaller than the coil part 370d. In the power transmission coil 30P, the coil part 370a is located inside the coil part 370b, the coil part 370b is located inside the coil part 370c, and the coil part 370c is located inside the coil part 370d. In the power transmission coil 30P, the communication coupler 20 is located inside the coil portion 370a. When the power transmission coil 30P is viewed from the direction of the reference line Za, the shape of the outer periphery of the power transmission coil 30P is rectangular. As shown in FIG. 19, the power transmission coil 30P is mounted on the mounting surface 11 so that the coil portions 370a to 370d are adjacent to each other on the inner side and the outer side. When viewed from the mounting surface 11 side, the power transmission coil 30P has a coil portion 370a formed by winding one lead wire clockwise, and the lead wire extending from the end of the coil portion 370a is counterclockwise. A coil portion 370b is formed by being wound around, a conductive wire extending from an end portion of the coil portion 370b is wound clockwise to form a coil portion 370c, and an end portion of the coil portion 370c is formed. The extending conducting wire is wound counterclockwise to form a coil portion 370d.

  Thus, when viewed from the mounting surface 11 side, the power transmission coil 30P has a clockwise current flowing through the coil portions 370a and 370c, and a counterclockwise current flows through the coil portions 370b and 370d. As a result, in the power transmission coil 30P, the direction of the magnetic field generated in the coil unit 370a and the direction of the magnetic field generated in the coil unit 370b are opposite to each other, and the direction of the magnetic field generated in the coil unit 370b and the coil unit 370c are generated. The direction of the magnetic field generated is reversed, and the direction of the magnetic field generated in the coil unit 370c and the direction of the magnetic field generated in the coil unit 370d are reversed. Thereby, since the direction of a magnetic field turns into mutually reverse direction in each coil part 370a-370d adjacent to the power transmission coil 30P, the radiation magnetic field of the arrangement direction of each coil part 370a-370d can be suppressed. Thereby, the power transmission coil 30 </ b> P can suppress the radiation magnetic field that affects the communication coupler 20.

[Modification 3]
Next, Modification 3 of the embodiment will be described. The non-contact power transmission units 1Q and 1R according to the modified example 3 are formed from one conductive wire having the same length as that of the power transmission coil 30 according to the embodiment, and the shape and number of each coil portion are different. The non-contact power transmission units 1Q and 1R according to the modification 3 include a coil portion in which the coil axis line Zb is positioned coaxially with the reference line Za, and a coil portion in which the coil axis line Zb is positioned on an axis different from the reference line Za. And both. Note that the non-contact power transmission units 1Q and 1R according to the modification 3 schematically illustrate the shapes of the power transmission coils 30Q and 30R, and a description common to the embodiment is omitted.

  For example, in the non-contact power transmission unit 1Q shown in FIG. 20, the power transmission coil 30Q is formed with five spiral coil portions 380a to 380e by winding one conductive wire. In the power transmission coil 30Q, the coil axis Zb of the coil part 380a is positioned coaxially with the reference line Za, and the coil axis Zb of the coil parts 380b to 380e is positioned on an axis different from the reference line Za. In the power transmission coil 30Q, the coil portion 380a is formed in a rectangular ring shape, and the coil portions 380b to 380e are formed in a rectangular shape. When viewed from the direction of the reference line Za, the shape of the outer periphery of the power transmission coil 30Q is rectangular. In the power transmission coil 30Q, the coil portion 380b and the coil portion 380d are opposed to each other with the coil portion 380a interposed therebetween, and the coil portion 380c and the coil portion 380e are opposed to each other with the coil portion 380a interposed therebetween. As shown in FIG. 20, the power transmission coil 30Q is mounted on the mounting surface 11 so that the coil portion 380a and the coil portions 380b to 380e are adjacent to each other. Furthermore, the power transmission coil 30Q is mounted on the mounting surface 11 so that the coil portions 380b to 370e are adjacent to each other. When viewed from the mounting surface 11 side, the power transmission coil 30Q has a coil portion 380a formed by winding one conductive wire clockwise, and the conductive wire extending from the end of the coil portion 380a is counterclockwise. A coil portion 380b is formed by being wound around, a conductive wire extending from an end portion of the coil portion 380b is wound counterclockwise to form a coil portion 380c, and an end portion of the coil portion 380c A coil portion 380d is formed by winding a conducting wire extending from the end in a counterclockwise direction, and a coil portion 380e is formed by winding a conducting wire extending from the end of the coil portion 380d in a counterclockwise direction. Yes.

  Thereby, when the power transmission coil 30Q is viewed from the mounting surface 11, the clockwise current flows through the coil portion 380a, and the counterclockwise current flows through the respective coil portions 380b to 380e. As a result, in the power transmission coil 30Q, the direction of the magnetic field generated in the coil unit 380a is opposite to the direction of the magnetic field generated in each of the coil units 380b to 380e. Thus, in the power transmission coil 30Q, the directions of the magnetic fields in the adjacent coil portions 380a and the respective coil portions 380b to 380e are opposite to each other, so that the radiation in the arrangement direction of the coil portions 380a and the respective coil portions 380b to 380e is performed. The magnetic field can be suppressed. Thereby, the power transmission coil 30 </ b> Q can suppress the radiation magnetic field that affects the communication coupler 20.

  Further, in the non-contact power transmission unit 1R shown in FIG. 21, the power transmission coil 30R is formed with 13 spiral coil portions 390a to 390n by winding one conductive wire. In the power transmission coil 30R, the coil axis Zb of the coil part 390a is located coaxially with the reference line Za, and the coil axis Zb of the coil parts 390b to 390n is located on an axis different from the reference line Za. In the power transmission coil 30R, the coil portion 390a is formed in a rectangular ring shape, and the coil portions 390b to 390n are formed in a rectangular shape. When viewed from the direction of the reference line Za, the outer shape of the power transmission coil 30R is rectangular. In the power transmission coil 30R, an annular coil portion 390a is disposed at the center, and the coil portions 390b to 390n are disposed around the annular coil portion 390a. As shown in FIG. 21, the power transmission coil 30R is mounted on the mounting surface 11 so that the coil portion 390a and the coil portions 390b to 390n are adjacent to each other. Furthermore, the power transmission coil 30R is mounted on the mounting surface 11 so that the coil portions 390b to 390n are adjacent to each other.

  When viewed from the mounting surface 11 side, the power transmission coil 30R has a coil portion 390a formed by winding one lead wire clockwise, and the lead wire extending from the end of the coil portion 390a is counterclockwise. A coil portion 390b is formed by being wound around, a conductive wire extending from the end portion of the coil portion 390b is wound counterclockwise to form a coil portion 390c, and an end portion of the coil portion 390c A coil portion 390d is formed by winding a conducting wire extending from the end in a counterclockwise direction, and a coil portion 390e is formed by winding a conducting wire extending from the end of the coil portion 390d in a counterclockwise direction. The coil extending from the end of the coil part 390e is wound counterclockwise to form the coil part 390f, and the conductor extending from the end of the coil part 390f is wound counterclockwise. Thus, a coil portion 390g is formed, a conductive wire extending from the end portion of the coil portion 390g is wound counterclockwise to form a coil portion 390h, and extends from the end portion of the coil portion 390h. A conducting wire is wound counterclockwise to form a coil portion 390i, a conducting wire extending from the end of the coil portion 390i is wound counterclockwise to form a coil portion 390j, and the coil portion A conducting wire extending from the end of 390j is wound counterclockwise to form a coil portion 390k, and a conducting wire extending from the end of the coil portion 390k is wound counterclockwise to form a coil portion 390m. The conductive wire extending from the end of the coil portion 390m is wound counterclockwise to form the coil portion 390n.

  Thereby, when viewed from the mounting surface 11 side, the power transmission coil 30R has a clockwise current flowing in the coil portion 390a and a counterclockwise current flowing in each of the coil portions 390b to 390n. As a result, in the power transmission coil 30R, the direction of the magnetic field generated in the coil part 390a is opposite to the direction of the magnetic field generated in each of the coil parts 390b to 390n. Thus, in the power transmission coil 30R, the directions of the magnetic fields in the adjacent coil portions 390a and the respective coil portions 390b to 390n are opposite to each other, so that the radiation in the arrangement direction of the coil portions 390a and the respective coil portions 390b to 390n is performed. The magnetic field can be suppressed. Thereby, the power transmission coil 30 </ b> R can suppress the radiation magnetic field that affects the communication coupler 20.

  In addition, the some coil part 31 grade | etc., May not be formed from one conducting wire, and may be formed from several conducting wire. In this case, a current is simultaneously applied to each conductor.

  Further, in the planar shape of the plurality of coil portions 31 and the like, the conducting wire may be stacked in the direction of the coil axis Zb and wound in two or more stages. Further, the number of the plurality of coil portions 31 and the like is not limited to the exemplified number.

  In addition, the non-contact power transmission system 100 only needs to include the power transmission coil 30 or the like in which at least one of the non-contact power transmission units on the power transmission side or the power reception side flows in the reverse direction in the adjacent coil unit 31 or the like. .

1-1R Non-contact power transmission unit 20 Communication coupler (communication unit)
30 to 30R power transmission coils 31 to 390n coil unit 100 non-contact power transmission system Za reference line Zb coil axis

Claims (5)

A communication unit that is provided on a preset reference line and transmits or receives a signal;
Each coil axis along the reference line is formed in a spiral shape, and has a plurality of coil portions provided around the reference line, and at least one set of the adjacent ones viewed from the direction along the reference line In the coil part, the one coil part and the other coil part flow in a reverse direction around the coil axis, and transmit power in a non-contact manner,
A non-contact power transmission unit comprising: The plurality of coil portions are:
The non-contact power transmission unit according to claim 1, wherein one conductive wire is formed by being wound along a direction orthogonal to the reference line. The power transmission coil is
An even number of the plurality of coil portions is provided, and in a combination of all the adjacent coil portions, one coil portion and the other coil portion flow in a reverse direction around the coil axis. The contactless power transmission unit according to 1 or 2. The plurality of coil portions are:
Each coil axis is located coaxially with the reference line, and when viewed from the direction along the reference line, one of the coil parts is located on the inner side of the adjacent coil parts, and the other coil part The non-contact power transmission unit according to claim 1 or 2, wherein is located outside. A contactless power transmission unit on the power transmission side for transmitting power in a contactless manner;
A power-receiving-side non-contact power transmission unit that receives power transmitted from the power-transmission-side non-contact power transmission unit, and
At least one of the contactless power transmission unit on the power transmission side or the contactless power transmission unit on the power reception side is:
A communication unit that is provided on a preset reference line and transmits or receives a signal;
Each coil axis along the reference line is formed in a spiral shape, and has a plurality of coil portions provided around the reference line, and at least one set of the adjacent ones viewed from the direction along the reference line In the coil part, the one coil part and the other coil part flow in a reverse direction around the coil axis, and transmit power in a non-contact manner,
A contactless power transmission system comprising:

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