JP3131100U - Power converter - Google Patents

Abstract

Provided is a power conversion device that can obtain a high rotational driving force regardless of the positional relationship of a rotating part with respect to a fixed part and can be driven to rotate with high efficiency.
A rotating shaft 31, a plurality of internal magnetic means 33, and a plurality of external magnetic means 50 are provided. Here, the internal magnetic means 33 is integrally connected to the rotary shaft 31 and is provided along the circular orbit 201, and a straight line connecting the N pole and the S pole in each of the circular orbits 201 at each location. The tangent and the direction of each other are substantially matched. The external magnetic means 50 is provided in a state surrounding the outer periphery of the 201 circular orbit and is magnetized by receiving external power supply, and is a straight line connecting the N pole and the S pole when magnetized. However, the tangent line of the circular orbit 201 at the installation location substantially coincides with each other, and the internal magnetic means 33 is configured to generate an attractive force or a repulsive force.
[Selection] Figure 1

Description

  The present invention relates to a power conversion device, and more particularly to a technique for converting 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. Then, 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. A DC motor converts electricity into a rotational driving force by the mechanism described above.
JP 05-176509 A

  However, in the motor according to the prior art including the above-mentioned Patent Document 1, the repulsive force acting between the rotor and the stator greatly fluctuates, and the rotational driving force cannot be obtained with high efficiency. In other words, the repulsive force acting between the stator and the rotor becomes the 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, so that 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 problem, and provides a power conversion device that can obtain a high rotational driving force regardless of the positional relationship of the rotating portion with respect to the fixed portion and can be rotationally driven with high efficiency. For the purpose.

  In order to achieve the above object, a power converter according to the present invention includes a rotating shaft, a plurality of internal magnetic means, and external magnetic means. Here, the plurality of internal magnetic means are integrally connected to the rotating shaft, and are provided along a circular orbit centered on the rotating shaft, and a straight line connecting the N pole and the S pole in each portion. The tangent of the circular orbit and the direction of each other substantially coincide with each other. The external magnetic means is provided in a state surrounding the outer periphery of the circular orbit, and is magnetized by receiving external power supply. A straight line connecting the N pole and the S pole when magnetized is provided. The tangent line of the circular orbit at the installation location and the direction of each other substantially coincide with each other, and an attractive force or a repulsive force is generated with respect to the internal magnetic means. In the power converter according to the present invention, the internal magnetic means rotates around the rotation axis by the action of the attractive force or the repulsive force with the magnetized external magnetic means.

In the power conversion device according to the present invention, the following variations can be adopted.
In the power conversion device according to the present invention, in the cross section orthogonal to the orbital axis of the circular orbit, the external magnetic means surrounds the internal magnetic means and opens in the direction of the rotating shaft, and the C-shaped electromagnetic coil It is possible to adopt a configuration in which
Further, in the power conversion device according to the present invention, a plurality of the external magnetic means are provided in a region surrounding the outer periphery of the circular orbit and spaced apart from each other, and each of the plurality of electromagnetic coils has a rotating shaft. It is possible to adopt a configuration that has a shape that forms a circular arc as a center and that is intermittently supplied with a direct current.

Further, the power conversion device according to the present invention adopts a configuration in which a plurality of electromagnetic coils constituting the external magnetic means are held and housed in a housing provided in a state surrounding the outer periphery of the circular orbit. Can do.
In the power conversion device according to the present invention, the housing is configured by a combination of a first shell member and a second shell member that are divided on a plane formed by a circular track. can do.

Further, the power conversion device according to the present invention may employ a configuration in which sensing means for detecting the position of the internal magnetic means is provided between the electromagnetic coils held and housed in the housing. .
Further, in 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 adjacent to each other in the circumferential direction of the circular orbit. It is possible to adopt a configuration in which the same polarities are arranged in a state satisfying the facing relationship.

  Further, the power conversion device according to the present invention may employ 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 according to the present invention, a straight line connecting the north pole and south pole of each internal magnetic means (movement direction of each internal magnetic means) and the north pole and south pole of the external magnetic means are connected. The internal magnetic means and the external magnetic means are provided so that the directions of the straight lines substantially coincide with the cut lines of the circular orbits around the rotation axis at each location. And in the power converter device which concerns on this invention, by employ | adopting the said structure, each internal magnetic means rotates with an attractive force or a repulsive force between external magnetic means.

  Therefore, in 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 power conversion device according to the present invention, when an output equivalent to that of the conventional DC motor is to be obtained, the power conversion device can be made smaller and lighter than the DC motor according to the related art.

Hereinafter, an example of a power converter 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. Operation of Power Conversion Device According to the Present Embodiment Next, the operation of the power conversion device according to the present embodiment having the above 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 direction of the magnetic field thereof is the tangential direction of the circular orbit 201, and each external magnetic means 50 is also a current. Since the straight line connecting the N pole and the S pole of the magnetic field generated at the time of supply is magnetized so as to substantially coincide with the cut line direction of the circular orbit 201 at each installation location, each approaching magnetic pole always follows the circular orbit 201. Since they face each other in the direction, they are rotationally driven with high efficiency by the respective attractive force or repulsive force. Therefore, in the power conversion device according to the present embodiment, it is possible to obtain a rotational driving force with higher efficiency than in a conventional DC motor.

  In addition, in the power converter device according to the present embodiment, it may be difficult to start up when it 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.

  In the above-described embodiment, the opening of the coil 52 is configured to face the rotating shaft 31. However, the shape of the spoke 32 does not necessarily require the opening to face the rotating shaft 31.

  The present invention is useful for realizing motors used for 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. 4 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 (8)

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 power conversion device having means,
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 by receiving external power supply, and a straight line connecting the N pole and the S pole when magnetized is mutually connected to the tangent of the circular orbit at the installation location. The direction is substantially matched and is configured to generate an attractive force or a repulsive force against the internal magnetic means,
The power conversion device, wherein the internal magnetic means rotates around the rotation axis by the action of the attractive force or the repulsive force with the magnetized external magnetic means. The external magnetic means has a C-shaped electromagnetic coil that surrounds the internal magnetic means and opens toward the rotating shaft in a cross section perpendicular to the orbital axis of the circular orbit. The power conversion device according to claim 1. In the region surrounding the outer periphery of the circular orbit, a plurality of the external magnetic means are provided at intervals from each other,
The power conversion device according to claim 2, wherein each of the plurality of electromagnetic coils has a shape that forms an arc centered on the rotation axis, and is intermittently supplied with a direct current. The power conversion device according to claim 3, wherein the plurality of electromagnetic coils are held and housed in a housing provided in a state surrounding an outer periphery of the circular orbit. The power conversion device according to claim 4, wherein the housing is configured by a combination of a first shell member and a second shell member that are divided in a plane formed by the circular raceway. The power conversion device according to claim 4 or 5, wherein a sensing means for detecting a position of the internal magnetic means is provided between the electromagnetic coils in the housing. The internal magnetic means is provided with an even number, each of which is a permanent magnet,
7. 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. A power conversion device according to any one of the above. The power converter according to any one of claims 1 to 7, wherein the same number of the internal magnetic means and the external magnetic means are provided.

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