JP2001045730A - Plane-counterfaced motor and coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the torque of and reduce the cost of a plane-counterfaced motor. SOLUTION: Portions of coils 22 on stator 21 side, having no effect in producing driving force in the motor 11, are positioned outside the areas of rotor 31 side permanent magnets 32, where magnetic gaps are formed. As a result, only the effective portions of the coils are placed on the peripheral side contributing to torque of the motor, and the torque can be increased. When the coils are formed using signal-phase printed coils, the coil in one phase is formed in one layer, and a three-phase motor is formed in three layers, and thereby the number of through-holes formed in the board can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat opposed motor and a coil usable for the motor.

[0002]

2. Description of the Related Art A conventional flat opposed motor will be described with reference to the drawings. FIG. 1A is a plan view showing a positional relationship between a coil and a field of a conventional flat opposed motor,
(B) is a side sectional view of the motor. The planar opposed motor 11 has a stator 21 on which a coil 22 is disposed and a rotor 31 on which a permanent magnet 32 is disposed. Coil 22
Are arranged around the bearing 24 to form a three-phase coil. The permanent magnet 32 is divided into eight parts around the rotation axis 33 in the circumferential direction,
The poles and the south poles are alternately magnetized to form a quadrupole field.
The stator 21 and the rotor 31 are formed of a magnetic material. There are various types of poles and coils other than the above.

[0003] In the conventional flat opposed motor 11,
As shown in FIGS. 1A and 1B, the coil 22 was arranged to face the permanent magnet 32 so as to fit in the area 12 where the gap of the magnetic circuit was formed. The force generated in the coil 22 will be described with reference to FIG. It is assumed that the coil 22 is divided into areas a to f. In this figure, in the areas b and e of the coil 22, the magnetic flux 3
4 shows a case where the directions are different.

When a current i flows through the coil 22, forces Fa to f are generated in the areas a to f by the current i and the magnetic flux 34 in the illustrated direction (Fleming's left hand rule). Here, of the forces Fa to f, only the forces Fb and e generated in the areas b and e are in the direction contributing to the driving of the motor. The forces Fa, c, d, generated in the remaining areas a, c, d, f
f occurs in a direction that does not contribute to driving the motor. In other words, the areas 22b, e arranged in the radial direction can be called effective portions for generating the driving force, and the remaining areas 22a, c, d, f
Can be called an invalid part.

[0005] Next, conventionally, in the planar opposed motor, as the coil 22, both a wound coil in which a conductive wire is wound by a winding machine and a printed coil formed by printing a coil pattern on an insulating substrate. Is used.
As the print coil, usually, a multilayer print coil in which multilayer print coils are stacked to increase the number of turns of the coil is used.

Referring to FIG. 3, the structure of the multilayer printed coil will be described. FIG. 3A is a plan view of the multilayer printed coil as viewed from above, FIG. 3B is a side view, and FIG. 3C is a diagram showing a connection state of each coil. The multilayer printed coil 41
As shown in (A), a coil 43 is placed on an insulating substrate 42.
Is printed, and a plurality of substrates 42 are laminated and formed as shown in FIG. The coil 43 is similar to the example of FIG.
A three-phase coil is formed for each layer. Each coil 43
Are the coils 43 at the same upper and lower positions in the stacked state.
Connected to

(C) shows coils 4 located at the same position in the upper and lower directions.
3 shows the connection status between the three. A through hole 44 is formed in the substrate 42, and the connection conductor 45 connects the coils 43 through the through hole 44. Thus, the coils 43 of each layer are connected in series. Here, in the case of a six-layer coil, three through holes 44 are required inside the coil 43 and two outside holes as shown in FIG. In addition,
In (A), in order to make the drawing easier to see, one coil 4
Although only the through holes 44 are shown in FIG. 3, the through holes 44 are actually formed in all the coils 43.

[0008]

As shown in FIG. 1, in a conventional flat opposed motor, a coil 22 is disposed in an area 12 where a gap of a magnetic circuit is formed. For this reason, as shown in FIG. 2, the invalid portions a, c, d, and
f is also arranged in the area 12 where the gap of the magnetic circuit is formed. In particular, in order to increase the torque of the motor 11, it is desirable to generate the driving force F on the outer peripheral side of the magnetic circuit. However, in the conventional motor 11, the invalid portion a of the coil 22 is located on the outermost peripheral side of the magnetic circuit. , F are arranged.

Therefore, in the conventional motor 11, the magnetic circuit is not effectively used for generating the driving force, and a sufficiently large driving force is not generated. In the multilayer printed coil 41 described with reference to FIG. 3, it is necessary to provide a large number of through holes 44 inside and outside the coil 41. This causes an increase in manufacturing cost, and also imposes a restriction on increasing the effective length of the coil 43 because the coil is arranged so as to avoid the through hole.

SUMMARY OF THE INVENTION It is an object of the present invention to increase the torque in a flat opposed motor. Also,
An object of the present invention is to make it possible to reduce the manufacturing cost of a multilayer printed coil used in a flat opposed motor, and further to provide a novel multilayer printed coil therefor. Is what you do.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. According to the present invention, in a planar opposed motor, a portion of a coil constituting a portion which is not effective in generating a driving force of the motor is disposed at a position outside an area where a gap of a magnetic circuit is formed.

According to the present invention, the effective length of the coil in the gap of the magnetic circuit can be increased, so that the torque of the motor can be increased. In particular, it is effective to increase the torque to remove the invalid portion of the coil on the outer peripheral side of the coil from the area where the gap of the magnetic circuit is formed. Further, in the present invention, the multi-phase coil of the planar opposed motor is formed by a multilayer print coil formed by laminating a plurality of single-phase print coils out of phase, and the single-phase print coil is: A portion that is effective for driving force generation is arranged at a position that has the same phase relationship with respect to the multipole field, and its outer peripheral portion is connected to the effective portion of one adjacent coil, and its inner peripheral portion is the other. Is connected to the effective part of the adjacent coil, so that the effective part of the coil is connected in series.

According to the present invention, the single-phase coils formed in one layer can be connected to each other without passing through the through holes. Therefore, the number of through holes and connection conductors can be reduced, and the manufacturing cost can be reduced. further,
The multilayer printed coil is used not only for a flat opposed motor, but also for various types of other motors, for example,
The present invention is also applicable to a cylindrical air-core coil.

[0014]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 4A shows an 8-pole 6 to which the present invention is applied.
FIG. 3 is a plan view showing a positional relationship between a coil and a field of a coil-plane opposed motor, and FIG. 4B is a side sectional view of the motor.

The planar opposed motor 11 has a stator 21 having a bearing 24 and a rotor 31 having a rotating shaft 33 rotatably supported by the bearing 24. Six coils 51 are arranged on the upper surface of the stator 21 around the bearing 24. The coil 51 may be a wound coil in which a conductive wire is wound by a winding machine or a printed coil formed by printed wiring. The six coils 51 are appropriately connected to form a three-phase coil. Each coil 22 is supplied with a current having a predetermined waveform from an excitation circuit. The connection between the coils 22, the configuration of the excitation circuit, and the like are well-known and have no direct relationship with the present invention.

A disk-shaped permanent magnet 32 is arranged on the rotor 31 around a rotation shaft 33. The permanent magnet 32
As shown by the broken line in (A), the N-pole and the S-pole are alternately magnetized into eight in the circumferential direction, and a four-pole field is formed. The stator 21 and the rotor 31 are formed of a magnetic material. In the planar opposed motor 11 according to the present embodiment, the coil 22 has a portion effective for generating the driving force of the motor 11 disposed in the area 12 where the gap of the magnetic circuit is formed, and an invalid portion having the gap formed. Area 1
2 outside. This will be described with reference to FIG.

FIG. 5 shows a state of generation of a force F for each portion of one coil 22. It is assumed that the coil 22 is divided into areas a to f. In the case of the flat opposed motor 11, for example, when it is at the position shown in FIG.
The direction of the coil 22 is set differently.
Is controlled, and a rotational force is always generated at some position.

When a current i flows through the coil 22, forces Fb, c, and Fb are applied to the areas b, c, d, and e arranged in the area 12 where the gap of the magnetic circuit is formed.
d and e occur. Forces Fb and e generated in areas b and e
Is the same as the rotation direction of the motor 11, and the forces Fc and d generated in the areas c and d do not match. Areas a and f correspond to area 1 where the gap of the magnetic circuit is formed.
2, no force is generated. That is, the areas b and e arranged in the radial direction can be called effective parts for generating the driving force, and the remaining areas a, c, d and f can be called invalid parts.

The forces Fb, c, generated by Fleming's law
Of the torques d and e, the portion on the outer peripheral side works effectively as the torque of the motor 11. According to the present embodiment, the invalid portions a and f of the coil 22 are removed from the area 12 where the gap of the magnetic circuit is formed, and the effective areas 22 b and e are arranged on the outer peripheral side of the area 12 where the gap is formed. Therefore, a sufficiently large torque can be obtained.

In the present embodiment, the inner coil 2
2 invalid areas c and d are replaced with area 1 where a gap is formed.
2, because the inner peripheral side has little effect on the increase or decrease of the torque of the motor 11. The invalid areas c and d can be arranged outside the area 12 where the gap is formed. Inner coil invalid areas c and d
Can be determined in the area 12 where the gap is formed or outside the gap 12 for design reasons or the like.

According to the motor 11 of the embodiment described above, the force generated by the Fleming's rule can be effectively used for driving the motor, and the torque of the motor can be increased. (Embodiment 2) An embodiment in which the coil in Embodiment 1 is formed by a multilayer printed coil will be described.

FIG. 6 is a diagram for explaining the principle of the present embodiment. FIG. 6A illustrates one-phase one-half of the coil 22 of the flat opposed motor 11 described in the first embodiment.
Only the coils 22 of the set are taken out and the relationship with the magnetic pole position of the permanent magnet 32 is shown. If the magnetic pole is 4 poles,
Regarding the magnetic pole position of the permanent magnet 32, the same pattern appears every 90 °. Therefore, as shown in FIG. 6 (B), another in-phase coil 22 is connected to the field at the same timing.
They can be arranged in pairs. The plurality of in-phase coils 22
As shown in FIG. 6C, by devising the connection between the coils, the connection can be made on the same surface without the need for a through hole.

FIG. 7 shows the structure of the coil 53 of FIG. 6C in detail. (A) is a plan view seen from above, and (B) is a side view. The coil wire is printed on the insulating substrate 52 to form the coil 53. The coil 53 includes a connecting portion 5 that connects between the effective portion 53a arranged in the radial direction and the adjacent effective portion 53a on the outer peripheral side.
3b, a connecting portion 53c for connecting the other adjacent effective portion 53a on the inner peripheral side, and ends 53d and e serving as a starting end and a terminating end of the coil 53.

An end 53d formed outside the coil 53
Is led out of the substrate 52 as it is. Coil 53
The end 53e formed inside the substrate 52 is led out to a through hole 44 formed in the substrate 52. Note that FIG. 7 does not show the relationship between the coil 53 and the field, but as already described with reference to FIGS.
Are arranged outside the area 12 where the gap of the magnetic circuit is formed.

The effective portion 53a of the coil 53 is composed of a plurality of wires arranged in parallel to form a group, and for each wire, the adjacent effective portions 5a are connected by connecting portions 53b and 53c.
3a. Thereby, the effective portions 53a provided on one surface of the substrate 52 are connected in series, and one single-phase coil 53 is formed. As shown in FIG. 7B, a multilayer printed coil 51 is formed by laminating substrates 52 of respective layers. The connection relationship of the coil 53 when forming the multilayer print coil 51 will be described later.

The configuration of the coil 53 for one layer will be further described with reference to FIG. FIG. 8A shows a case where the coils 53 are formed on both surfaces of the substrate 52. Ends 53 e formed inside the coil 53 are connected to each other through through holes 44 formed in the substrate 52. Thereby, the coils 53 on both sides are connected in series. An end 53d formed outside the coil 53 is drawn out on both sides of the substrate 52 to form a terminal 57.

When the coils 53 are formed on both surfaces of the substrate 52, the effective portions 53a of the coils 53 are arranged at the same position with respect to the field on both the front side and the back side. Further, the effective portion 54a and the connection portion 5 are so arranged that the direction of the current flowing through the effective portion 53a is the same on both surfaces.
The connection relationship between 4b and 54c is determined. FIG. 8 (B)
The case where the coil 53 is formed only on one side of the substrate 52 is shown. In this case, the connection conductor 56 is formed on the back side of the substrate 52 by printing. The inner end 53 of the coil 53 is connected to the connection conductor 56 through the through hole 44. The connection conductor 56 is drawn out to a terminal 57 outside the substrate.

FIG. 9 is a diagram showing that a multilayer printed coil 51 for a three-phase motor is formed by the three-layered coil 53. The single-phase coil 53 shown in FIG.
Three layers are prepared for the V phase and the W phase. At this time, the coils 53 of each phase are arranged so as to be shifted from each other by a predetermined phase. Each substrate 52 is stacked and adhered with an adhesive to form one multilayer printed coil 51. The coil 53 of each phase is connected to the excitation circuit.

As shown in FIG. 9, in this embodiment, one through hole 44 is formed in one substrate 52.
Is merely formed. Therefore, according to the present embodiment, the number of through holes 44 can be reduced, and the manufacturing cost can be reduced. Further, since the space for disposing the through hole 44 is reduced, the degree of freedom in disposing the hall sensor and the like is increased.

FIG. 10 shows an example in which the number of turns of the single-phase coil is increased. In the example of FIG. 8A, the number of turns of the coil can be increased as compared with the example of FIG. Further, when it is desired to increase the number of turns of the coil, as shown in FIG. 10, two or more layers of the coil 53 shown in FIG. 8 are prepared. In this case, two coils 5
3 need to be formed in the same phase without shifting the phases. The terminals 57 of the two coils 53 are connected to the connection conductor 5
8, the two coils 5
3 are connected in series.

The coil in the second embodiment can be applied not only to a flat opposed motor but also to other types of motors. For example, the present invention can be applied to a motor in which a stator and a rotor are formed in a cylindrical shape, in which an effective portion of a coil is arranged in an axial direction of a cylindrical insulating substrate.

[0032]

According to the present invention, the torque can be increased in the flat opposed motor. Further, according to the present invention, it is possible to reduce the manufacturing cost of the multilayer printed coil used for the motor.

[Brief description of the drawings]

FIG. 1 is a diagram showing the structure of a conventional flat-facing motor.

FIG. 2 is a diagram showing a situation where a force is generated for each portion in the coil of FIG. 1;

FIG. 3 is a diagram illustrating a multilayer printed coil used in a conventional motor.

FIG. 4 is a diagram showing the structure of a flat opposed motor according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a situation where a force is generated for each part of the coil of FIG. 4;

FIG. 6 is a view for explaining the principle of the second embodiment of the present invention.

FIG. 7 is a diagram showing a structure of a coil according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of one layer of the coil of FIG. 7;

FIG. 9 is a diagram showing a method of forming the multilayer printed coil of FIG. 7;

FIG. 10 is a view showing a modification of the coil of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Planar opposed motor 12 ... Area where a gap is formed 21 ... Stator 22 ... Coil 24 ... Bearing 31 ... Rotor 32 ... Permanent magnet 33 ... Rotating shaft 34 ... Magnetic flux 41 ... Polyphase print coil 42 ... Substrate 43 ... Coil 44 ... Through hole 45 ... Connection conductor 51 ... Multilayer printed coil 52 ... Substrate 53 ... Coil 53a ... Effective part of coil wire 53b, c ... Connection part 53d, e ... End 57 ... Terminal 58 ... Connection conductor a to f … Each area of the coil

Claims (6)

[Claims] In a planar opposed motor, a portion of a coil constituting a portion which is not effective for generating a driving force of the motor is located at a position outside an area where a gap of a magnetic circuit is formed. Flat opposed motor. 2. The flat opposed motor according to claim 1, wherein the portion that is not effective in generating the driving force of the coil is an outer peripheral portion of the coil. 3. The planar opposed motor, wherein the coil is constituted by a multilayer printed coil formed by laminating a plurality of single-phase printed coils out of phase with each other, wherein the single-phase printed coil is a multipole field coil. A portion effective for driving force generation is arranged at a position having the same phase relationship with respect to the magnet, and its outer peripheral portion is connected to the effective portion of one adjacent coil, and the inner peripheral portion has the other adjacent coil. Wherein the effective portion of the coil is connected in series by being connected to the effective portion. 4. The single-phase printed coil is formed on both surfaces of a single printed circuit board, and the single-phase coils on the two surfaces are connected through through holes formed in the substrate inside the printed coil. The flat opposed motor according to claim 3. 5. The flat opposed motor according to claim 2, wherein a connection portion connecting the adjacent effective portions is disposed at a position outside a gap of the magnetic circuit. 6. A multilayer print coil formed by laminating a plurality of single-phase print coils out of phase with each other, wherein the single-phase print coil has the same phase relationship with a multipolar field. A portion effective for driving force generation is arranged at a certain position, one end of which is connected to the effective portion of one adjacent coil, and the other end thereof is connected to the effective portion of the other adjacent coil, A multi-phase printed coil, wherein the effective parts of the coil are connected in series.