JP2008199691A - Method of driving power conversion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of driving a power conversion apparatus, capable of obtaining high rotational driving force irrespective of the positional relation between a fixed portion and a rotating portion and efficiently rotating and driving the power conversion apparatus. <P>SOLUTION: The power conversion apparatus has a rotary shaft 31, a plurality of internal magnetic means 33 and a plurality of external magnetic means 50. In this case, the internal magnetic means 33 are connected integrally with the rotary shaft 31, provided along a circle orbit 201, and is constituted so that the direction of a straight line connecting an N-pole to an S-pole matches the direction of a tangent of the circle orbit 201 in each of the magnetic means 33. The external magnetic means 50 is provided so as to surround the external circumference of the circle orbit 201, magnetized by being supplied with power from the outside, and is constituted so that the direction of a straight line connecting the N-pole to the S-pole in magnetization matches the direction of the tangent of the circle orbit 201 at the installation site and a suction force or a repulsive force is generated for the internal magnetic means 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a driving method for a power converter, and more particularly to a driving method in a power converter that converts electricity into a rotational driving force.

The configuration of the DC motor according to the prior art will be described with reference to FIG.
As shown in FIG. 4, the DC motor has a pair of anisotropic magnets 412 facing each other as a stator that is a fixed portion, and a rotor 414 as a rotor that is a rotating portion. Note that the pair of anisotropic magnets 412 is attached to the yoke 420.
The rotor 414 has a plurality of cores 416, and a coil 418 is wound around each of the plurality of cores 416. When the DC motor is driven, a current whose polarity changes in a constant cycle is supplied to the coil 418, and the plurality of cores 416 that have received the current become electromagnets whose polarity is switched. Each of the plurality of cores 416 generates a repulsive force with the anisotropic magnet 412 having the same polarity as the magnetism is switched, so that the rotor 414 becomes an anisotropic magnet. It rotates in the magnetic field generated by 412. In a DC motor, electricity is converted into a rotational driving force by the mechanism as described above.
JP 05-176509 A

  However, in the DC motor according to the prior art including the above-mentioned Patent Document 1, the repulsive force acting between the rotor and the stator varies greatly, and the rotational driving force cannot be obtained with high efficiency. That is, the repulsive force acting between the stator and the rotor becomes strongest when the rotor approaches the stator along the tangential direction and the directions of the magnetic lines of force are facing each other. Becomes the normal direction and does not coincide with the rotation direction of the rotor, and therefore the torque is minimized.

On the other hand, when the magnetic pole of the rotor is already separated from the corresponding magnetic pole of the stator, the direction of action of the repulsive force coincides with the rotational direction of the rotor, but the direction of the magnetic lines of force between the rotor and the stator is a radial direction that is substantially orthogonal. Therefore, the repulsive force is already reduced to near zero. As described above, the conventional direct current motor cannot obtain the rotational driving force with high efficiency.
The present invention has been made to solve the above problems, and can obtain a high rotational driving force regardless of the positional relationship of the rotating part with respect to the fixed part, and a driving method of a power conversion device that can be rotationally driven with high efficiency. The purpose is to provide.

  In order to achieve the above object, a driving method for a power conversion device according to the present invention includes a rotating shaft, and a plurality of driving devices connected to the rotating shaft and provided along a circular orbit centered on the rotating shaft. This is a method of driving a power conversion device having internal magnetic means and external magnetic means provided in a state surrounding the outer periphery of a circular orbit. The plurality of internal magnetic means are configured such that a straight line connecting the N pole and the S pole in each is substantially coincident with the tangent of the circular orbit, and the external magnetic means supplies power. In response, the straight line connecting the N pole and the S pole is magnetized so that the directions of the tangents of the circular orbit are substantially coincident with each other, and attraction or repulsive force between the plurality of internal magnetic means in the magnetized state Will occur.

In the driving method of the power conversion device according to the present invention, power supply is intermittently executed to the external magnetic means, and the internal magnetic means has an attractive force or a repulsive force generated when the external magnetic means is magnetized. Then, both the inertial action and the inertial action when the power supply to the external magnetic means is stopped are alternately received and rotated around the rotation axis.
In the driving method of the power conversion device according to the present invention, the following variations can be adopted.

  In the driving method of the power conversion device according to the present invention, a plurality of external magnetic means in the power conversion device are provided in a region surrounding the outer periphery of the circular orbit, spaced apart from each other, and each of the plurality of external magnetic means is , Comprising a C-shaped electromagnetic coil that surrounds the internal magnetic means in a cross section perpendicular to the orbital axis of the circular orbit and opens toward the rotating shaft, and direct current is applied to the electromagnetic coil. A method of intermittent supply can be employed.

Further, the driving method of the power conversion device according to the present invention employs a configuration in which a plurality of electromagnetic coils in the power conversion device are held and accommodated in a housing provided in a state surrounding the outer periphery of the circular orbit. be able to.
In the driving method of the power conversion device according to the present invention, a sensing means for detecting the position of the internal magnetic means is provided between the electromagnetic coils in the housing, and intermittent DC current is supplied to the electromagnetic coils. It is possible to adopt a method of executing based on the sensing result regarding the position of the internal magnetic means in the sensing means.

Further, in the driving method of the power conversion device according to the present invention, an even number of internal magnetic means are provided, each of which is a permanent magnet, and the even number of permanent magnets are arranged around the circumference of the circular orbit. It is possible to adopt a configuration in which the same polarities are arranged so as to satisfy the relationship in which the same polarities are opposite to each other in the direction adjacent to each other.
Further, in the driving method of the power conversion device according to the present invention, it is possible to adopt a configuration in which the same number of internal magnetic means and external magnetic means are provided.

  As described above, in the power conversion device targeted by the driving method according to the present invention, the straight line connecting the N pole and the S pole of each internal magnetic means (movement direction of each internal magnetic means) and the N pole of the external magnetic means The internal magnetic means and the external magnetic means are provided so that the straight line connecting the S pole and the S pole substantially coincides with the cut line of the circular orbit centering on the rotation axis at each location. In the driving method of the power conversion device according to the present invention, the power is intermittently supplied to the external magnetic means, the action of the attractive force or the repulsive force on the internal magnetic means when the power is supplied, and the power The internal magnetic means is rotated around the rotation axis by exerting both actions of inertia acting on the internal magnetic means when the supply is stopped.

In the driving method of the power conversion device according to the present invention, unlike the DC motor according to Patent Document 1, the rotational driving force does not change greatly depending on the mutual positional relationship between the fixed portion and the rotating portion, and the efficiency is high. A rotational driving force can be obtained.
Therefore, in the driving method of the power conversion device according to the present invention, it is possible to convert the rotational driving force more efficiently and obtain a stronger output without increasing the volume and the number of parts with respect to the conventional DC motor. . Further, in the driving method of the power conversion device according to the present invention, when an output equivalent to that of the conventional DC motor is to be obtained, the size and weight can be reduced as compared with the DC motor according to the related art.

Hereinafter, an example of the power conversion device according to the present invention will be described in detail with reference to the drawings.
1. Schematic Structure of Power Conversion Device A schematic structure of the power conversion device according to the embodiment will be described with reference to FIG. FIG. 1 is a partial cross-sectional view showing the structure of the power conversion device according to the present embodiment.
As shown in FIG. 1, the power conversion device according to the present embodiment includes a rotating unit 30 and a fixed unit 1 as main elements. The rotating unit 30 includes six internal magnetic means 33 that rotate about the rotating shaft 31.

From the rotating shaft 31, six spokes 32 extending radially through a hub are joined on a plane orthogonal to the axis, and an internal magnetic means 33 is attached to each tip. The six spokes 32 extending radially are provided at an angle of 60 [°].
The six internal magnetic means 33 are arranged on the same circumference (circular orbit 201) with the rotation axis 31 as the center, and each is formed in an arc shape with the same radius of curvature as the circular orbit 201. Yes. The internal magnetic means 33 is specifically a permanent magnet, and when the straight line connecting the north pole and the south pole is considered, the direction thereof is configured to coincide with the tangential direction of the circular orbit 201 at each location. ing. The six internal magnetic means 33 can integrally rotate an annular circular track 201 centered on the rotation shaft 31.

On the other hand, the fixed portion 1 has a configuration including six external magnetic means 50 and three magnetic sensing means 60. Specifically, the six external magnetic means 50 and the magnetic sensing means 60 are attached to the housing 20 provided on the outer peripheral portion surrounding the circular orbit 201 around which the internal magnetic means 33 rotates.
Each of the six external magnetic means 50 includes a core 51 made of a magnetic sheet such as iron, and a number of coils 52 that magnetize the core 51 by supplying current. The specific structure of the external magnetic means 50 will be described later.

Each of the three magnetic sensing means 60 senses the adjacent internal magnetic means 33 and outputs a signal to the ON / OFF control unit 204 (not shown in FIG. 1, refer to FIG. 2). As the specific magnetic sensing means 60, for example, a Hall IC or a detection coil can be employed.
2. Structure of External Magnetic Means 50 and Housing 20 The detailed structure of the external magnetic means 50 and the housing 20 in the fixed portion 1 will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view showing the configuration of the main part.

  As shown in FIG. 2, the housing 20 has a structure in which a first shell member 21 and a second shell member 22 are combined. The first shell member 21 and the second shell member 22 are joined on a plane formed by the circular track 201, and are substantially C-shaped surrounding the internal magnetic means 33 that rotates on the circular track 201. The cross-sectional shape is as follows. The opening 231 in the housing 20 is provided so as not to interfere with the spoke 32 joined to each internal magnetic means 33. The housing 20 has a donut shape surrounding the outer periphery of the circular track 201 as shown in FIG. 1 with the cross-sectional shape shown in FIG.

The housing 20 does not necessarily have to adopt the two-divided configuration of the first shell member 21 and the second shell member 22 as in the present embodiment. From this point of view, it is desirable to have a two-part configuration.
Next, the external magnetic means 50 attached to the housing 20 is composed of the combination of the core 51 and the coil 52 as described above, and rotates the circular track 201 as shown in FIG. It is arranged in the state close to the outside of the internal magnetic means 33. Further, the same number of external magnetic means 50 as the internal magnetic means 33 are provided, and are attached to the donut-shaped housing 20 at equal intervals.

The core 51 in the external magnetic means 50 has a C-shaped cross section that is slightly smaller than the housing 20. The core 51 is attached to the housing 20 in the vicinity of the opening 231 and is opened so as not to interfere with the spokes 32 as in the housing 20.
As shown in FIG. 2, the coil 52 is composed of a plurality of coil elements each formed in a C shape along the outer wall of the core 51. A plurality of coil elements constituting the coil 52 are connected in parallel to the power source 203.

As shown in FIG. 1, three magnetic sensing means 60 are arranged at equal intervals so as to face the circular orbit 201 on the inner peripheral surface of the housing 20.
According to this configuration, when electricity in the same direction is supplied to all the coils 52, the external magnetic means 50 whose axial center line is on the circular orbit 201 has a straight line connecting its N pole and S pole at each installation location. This substantially coincides with the tangential direction of the circular orbit 201.

  The magnetic sensing means 60 attached to the housing 20 outputs a signal to the ON / OFF control unit 204 when the internal magnetic means 33 is sensed. As shown in FIG. 2, the ON / OFF control unit 204 is inserted in one of the connection paths between the power source 203 and the coil 52, and is based on the sensing signal input from the magnetic sensing means 60. Perform ON / OFF control. Specific control executed by the ON / OFF control unit 204 will be described later.

  The power source 203 supplies a direct current to each coil element of the coil 52. As described above, the direct current from the power source 203 is pulsed by the ON / OFF control by the ON / OFF control unit 204, and the pulsed current is supplied to the coil 52, whereby the external magnetic means 50. Will be intermittently magnetized. As shown in FIG. 1, the magnetic poles of the external magnetic means 50 when a current is supplied to the coil 52 have the same polarity (N pole and N pole) between the external magnetic means 50 adjacent in the direction along the circular orbit 201. Poles, S poles and S poles) face each other.

In the power conversion device according to the present embodiment, the internal magnetic means 33 rotates counterclockwise in FIG.
3. Next, a driving method of the power conversion device according to the present embodiment having the above-described configuration will be described with reference to FIGS. FIG. 3 is a schematic cross-sectional view showing a state in which the internal magnetic means 33 passes through the external magnetic means 50.

(A) Start-up First, the drive of the power converter stopped in the state shown in FIG. 1 is started. In the state shown in FIG. 1, since the magnetic sensing means 60 senses the internal magnetic means 33, a sensing signal is output to the ON / OFF control unit 204 (see FIG. 2). The ON / OFF control unit 204 that has received an input of a sensing signal from the magnetic sensing means 60 turns on the circuit of the power source 203 and the coil 52. As described above, when a current is supplied to the coil 52, the external magnetic means 50 is magnetized with the polarity shown in FIG.

  As shown in FIG. 1, when the external magnetic means 50 is magnetized, each of the six internal magnetic means 33 has a different polarity from the adjacent external magnetic means 50 in the rotation direction (counterclockwise) front. Attracting force (attraction force) is generated, and repulsive force is generated with the same polarity at the rear in the rotation direction. The six internal magnetic means 33 start to rotate counterclockwise (counterclockwise) due to the attractive force / repulsive force with the external magnetic means 50. In this way, the power conversion device according to the present embodiment is activated.

(B) After activation In the power conversion device activated as described above, the internal magnetic means 33 rotates counterclockwise, and each internal magnetic means 33 faces the external magnetic means 50 as shown in FIG. The ON / OFF control unit 204 stops supplying the current to the coil 52 immediately before reaching the position. When the current supply to the coil 52 is stopped and the magnetic force of the external magnetic means 50 disappears, the internal magnetic means 33 does not interact with the external magnetic means 50, and the external magnetic means 50 remains as it is according to inertia. Pass through.

When the internal magnetic means 33 that rotates according to inertia reaches the position shown in FIG. 1 again, the magnetic sensing means 60 outputs a sensing signal to the ON / OFF control unit 204 again. Then, the ON / OFF control unit 204 turns on the circuit of the power source 203 and the coil 52 so that the external magnetic means 50 is magnetized and the internal magnetic means 33 obtains rotational force.
In the power conversion device according to the present embodiment, the rotation continues until the main switch of power supply 203 is turned off.

4). Advantages As described above, in the power conversion device according to the present embodiment, each internal magnetic means 33 is configured such that the straight line connecting the north pole and the south pole substantially matches the cut line direction of the circular orbit 201. Each of the external magnetic means 50 is also magnetized so that the straight line connecting the N pole and the S pole when the current is supplied substantially coincides with the direction of the cut line at each location in the circular orbit 201. Since the magnetic poles always face each other in the direction along the circular orbit 201, the magnetic poles are rotationally driven with high efficiency by the respective attractive force or repulsive force. Therefore, in the driving method of the power conversion device according to the present embodiment, the rotational driving force can be obtained with higher efficiency than the conventional DC motor.

  In the driving method of the power conversion device according to the present embodiment, it may be difficult to start up when the vehicle is stopped in the state of FIG. 3, but such a situation is rare. . However, it is desirable to take the following measures. In other words, it is desirable to take measures such as adding an encoder or the like to always stop in the state shown in FIG. 1 or adding another means for assisting activation.

5. Other Matters The power conversion device according to the above-described embodiment is employed as an example for easy understanding of the configuration, operation, and effect of the present invention, and is not limited thereto. For example, in the above-described embodiment, the magnetic sensing means 60 provided in the housing 20 is employed to detect the position of the internal magnetic means 33. The position of the magnetic means 33 can be detected.

In the above-described embodiment, a configuration having six internal magnetic means 33 and six external magnetic means 50 is employed. However, the number of internal magnetic means 33 and external magnetic means 50 is not limited thereto. In the above embodiment, the number of the internal magnetic means 33 and the number of the external magnetic means 50 are the same. However, it is not always necessary that the numbers are the same.
Moreover, in the said embodiment, although the housing 20 of the structure which consists of a combination of the 1st shell member 21 and the 2nd shell member 22 was employ | adopted from a viewpoint of ensuring ease of manufacture, a division | segmentation structure is necessarily employ | adopted. There is no need, and a larger number of divided configurations can be used.

  INDUSTRIAL APPLICABILITY The present invention is useful for realizing motors used in a wide range of applications such as electric tools, electric appliances, hybrid vehicles, and electric vehicles.

In the power converter device according to the embodiment, it is a schematic cross-sectional view cut along a plane orthogonal to the rotation shaft 31. FIG. In the power converter device which concerns on embodiment, it is a schematic cross section which shows the structure of the principal part. FIG. 5 is a schematic cross-sectional view showing a state in which each internal magnetic means 33 passes through the external magnetic means 50 in the power conversion device according to the embodiment. It is a schematic cross section which shows the structure of the DC motor which concerns on a prior art.

Explanation of symbols

1. Fixed part 20. Housing 21. First shell member 22. Second shell member 30. Rotating unit 31. Rotating shaft 32. Spokes 33. Internal magnetic means 50. External magnetic means 51. Core 52. Coil 60. Magnetic sensing means 201. Rotational trajectory 203. Power supply 204. ON / OFF control unit 231. Aperture

Claims (6)

A rotating shaft, a plurality of internal magnetic means connected to the rotating shaft and provided along a circular orbit centered on the rotating shaft, and an external magnet provided to surround the outer periphery of the circular orbit A method of driving a power conversion device comprising:
The plurality of internal magnetic means is configured such that a straight line connecting the N pole and the S pole in each of the tangents of the circular orbit substantially coincides with each other.
The external magnetic means is magnetized in a state in which a straight line connecting the N pole and the S pole is supplied with electric power so that the directions of the tangents of the circular orbit substantially coincide with each other, and the plurality of internal magnets are magnetized in the magnetized state. An attractive force or repulsive force is generated between the magnetic means,
The power supply to the external magnetic means is intermittent,
The internal magnetic means alternately receives both an action of an attractive force or a repulsive force generated when the external magnetic means is magnetized and an inertial action when power supply to the external magnetic means is stopped. And rotating around the rotation axis. A plurality of the external magnetic means in the power conversion device are provided at a distance from each other in a region surrounding the outer circumference of the circular orbit,
Each of the plurality of external magnetic means includes a C-shaped electromagnetic coil that surrounds the internal magnetic means and opens toward the rotating shaft in a cross section orthogonal to the orbital axis of the circular orbit. It is prepared
The method for driving a power converter according to claim 1, wherein a direct current is intermittently supplied to the electromagnetic coil. The driving method of the power conversion device according to claim 2, wherein the plurality of electromagnetic coils in the power conversion device are held and housed in a housing provided in a state surrounding an outer periphery of the circular orbit. Sensing means for detecting the position of the internal magnetic means is provided between each of the electromagnetic coils in the housing,
The driving method of the power conversion device according to claim 3, wherein a direct current is intermittently supplied to the electromagnetic coil based on a sensing result of the position in the sensing means. The internal magnetic means is provided with an even number, each of which is a permanent magnet,
5. The even number of permanent magnets are arranged in a state satisfying a relationship in which the same polarities face each other between adjacent ones in the circumferential direction of the circular orbit. The drive method of the power converter device described in 2. The driving method of the power conversion device according to any one of claims 1 to 5, wherein the same number of the internal magnetic means and the external magnetic means are provided.

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