JP2006074989A - Axial gap type rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial-gap rotary electric machine upgrading availability of rotor cores, increasing the reluctance torque, as well as increasing total torque with magnet torque even if the reluctance torque is increased. <P>SOLUTION: An axial-gap rotary-electric machine includes a rotor having a permanent magnet, and a stator having stator coils, and has a construction in which at least one rotor and at least one stator are disposed in axial direction. The rotor 23 is provided with a permanent magnet 32-1, magnetized in the circumferential direction relative to a rotating shaft, and a permanent magnet 32-2 magnetized in the radial direction relative to the rotating shaft and a rotor 23, as well as a stator 24-3 separate from stators 24-1, 24-2 in the axial direction at outer circumference portion in radial direction and/or inner circumferential portion in radial direction of the rotor 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an axial gap type rotating electrical machine including a rotor having a permanent magnet and a stator having a stator coil, and having a structure in which at least one rotor and at least one stator are arranged in an axial direction. is there.

2. Description of the Related Art Conventionally, an axial gap type rotating electrical machine including a rotor having a permanent magnet and a stator having a stator coil and having a structure in which at least one rotor and at least one stator are arranged in the axial direction has various configurations. Are known (for example, see Patent Document 1).
JP 2003-88032 A

  FIGS. 7A and 7B are diagrams for explaining an example of a rotor in a conventional axial gap type rotating electrical machine. Here, FIG. 7A shows a plan view of a conventional axial gap type rotating electric machine, and FIG. 7B shows a cross-sectional view taken along line AA of FIG. 7A. In the example shown in FIGS. 7A and 7B, the conventional rotor 51 is configured by arranging a plurality of fan-shaped permanent magnets 53 in the circumferential direction of the rotor core 52. The permanent magnets 53 are magnetized parallel to the rotation axis direction in each permanent magnet 53, and the magnetization directions of the adjacent permanent magnets 53 are alternately reversed.

  In the conventional axial gap type rotating electrical machine as shown in FIGS. 7A and 7B described above, the rotor 51 is magnetized in the direction of the rotation axis, so that if the reluctance torque is increased, the magnet torque decreases. As a result, there is a problem that the torque decreases in total.

  An object of the present invention is to solve the above-mentioned problems, improve the utilization rate of the rotor core, increase the reluctance torque, and increase the total torque with the magnet torque even if the reluctance torque is increased. It is intended to provide a rotating electrical machine.

  An axial gap type rotating electrical machine according to the present invention is composed of a rotor having a permanent magnet and a stator having a stator coil, and an axial gap having a structure in which at least one rotor and at least one stator are arranged in the axial direction. In the rotary electric machine, a permanent magnet that is magnetized in the circumferential direction with respect to the rotating shaft and a permanent magnet that is magnetized in the radial direction with respect to the rotating shaft are provided on the rotor, and the radial outer periphery of the rotor and / or A stator different from the stator in the axial direction is provided on the radially inner periphery.

  According to the axial gap type rotating electrical machine of the present invention, the rotor is composed of a permanent magnet that is magnetized in the circumferential direction with respect to the rotating shaft and a permanent magnet that is magnetized in the radial direction with respect to the rotating shaft. The utilization rate of the rotor core can be improved, and the reluctance torque can be increased. Further, the torque can be increased by providing a stator different from the stator in the axial direction on the inner peripheral portion and / or the outer peripheral portion of the rotor.

  In addition, as a suitable example of the axial gap type rotating electrical machine of the present invention, a permanent magnet magnetized in the circumferential direction with respect to the rotating shaft and a diameter with respect to the rotating shaft arranged in the outer peripheral portion are arranged in the radial direction. A rotor having a configuration in which a triangular space is formed with permanent magnets magnetized in the direction and the triangular permanent magnets are arranged so that the same magnetic poles face each other in the axial direction by the first stator and the second stator. While arrange | positioning so that it may pinch | interpose, a 3rd stator can be arrange | positioned to a radial direction outer peripheral part. By comprising in this way, a reluctance torque and a total torque can be increased more effectively.

  As a preferred example of the axial gap type rotating electrical machine of the present invention, a permanent magnet arranged in the radial direction and magnetized in the circumferential direction with respect to the rotating shaft, and a rotating shaft arranged in the inner peripheral portion. A rotor having a configuration in which a U-shaped space having an opening on the outer peripheral side is configured with a permanent magnet magnetized in the radial direction, and the U-shaped permanent magnet is disposed so that the same magnetic poles face each other. The first stator and the second stator can be disposed so as to be sandwiched in the axial direction, and the third stator can be disposed on the radial outer periphery and / or the radial inner periphery. By comprising in this way, a reluctance torque and a total torque can be increased more effectively.

  Furthermore, as a suitable example of the axial gap type rotating electrical machine of the present invention, a permanent magnet that is arranged in the radial direction and is magnetized in the circumferential direction with respect to the rotating shaft, and a diameter that is arranged on the outer peripheral portion with respect to the rotating shaft. A rotor having a U-shaped space having an opening on the inner peripheral side, and a U-shaped permanent magnet arranged so that the same magnetic poles face each other. The first stator and the second stator can be disposed so as to be sandwiched in the axial direction, and the third stator can be disposed on the radial outer periphery and / or the radial inner periphery. By comprising in this way, a reluctance torque and a total torque can be increased more effectively.

  Furthermore, as a preferred example of the axial gap type rotating electrical machine of the present invention, a permanent magnet arranged in the radial direction with respect to the rotating shaft and a rotating shaft arranged in the inner peripheral portion are arranged in the radial direction. On the other hand, a permanent magnet magnetized in the radial direction and a permanent magnet magnetized in the radial direction with respect to the rotating shaft are arranged on the outer periphery to form a rectangular space, and the rectangular permanent magnet is the same. A rotor having a configuration in which the magnetic poles are arranged to face each other is arranged so as to be sandwiched between the first stator and the second stator in the axial direction, and a third stator is arranged at the radial outer periphery and / or the radial inner periphery. can do. By comprising in this way, a reluctance torque and a total torque can be increased more effectively.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a view for explaining an example of an axial gap type rotating electrical machine of the present invention. In the example shown in FIG. 1, a rotor shaft 2 serving as a rotation shaft, a disk-shaped rotor 3 fixed to the rotor shaft 2, and two stators 4-1 and 4-2 provided to face the rotor 3. Is housed in the housing 5 to constitute the axial gap type rotating electrical machine 1. In this example, the rotor shaft 2 is rotatably mounted on the housing 5 via bearings 6-1, 6-2. The rotor 3 includes a rotor core 7 and permanent magnets 8-1 and 8-2 provided on both sides of the rotor core 7. Further, each of the stators 4-1 and 4-2 has stator teeth 11-1 and 11-2 in which coils 10-1 and 10-2 are wound in cylindrical stator cores 9-1 and 9-2. A plurality of parts are arranged circumferentially at equal intervals.

  The axial gap type rotating electrical machine according to the present invention is characterized in that, in the axial gap type rotating electrical machine having the above-described configuration, the configuration of the permanent magnet and the configuration of the stator are changed and magnetized in the circumferential direction with respect to the rotating shaft. A permanent magnet that is magnetized in the radial direction with respect to the rotating shaft and a stator that is separate from the axial stator on the radial outer periphery and / or radial inner periphery of the rotor. It is the point which comprised so that it might provide. Hereinafter, those changes will be described in detail.

  2 (a) and 2 (b) are diagrams for explaining an example of the axial gap type rotating electrical machine of the present invention. Here, FIG. 2 (a) is a view showing a part of the rotor and the added stator in a longitudinal section in order to simplify the explanation of the changes in the rotor and the stator, and FIG. 2 (b) is a view in FIG. 2 (a). It is a figure which shows the cross section along XX in. In the example shown in FIGS. 2A and 2B, the axial gap type rotating electric machine 21 of the present invention is opposed to a disc-shaped rotor 23 fixed to a rotor shaft (not shown) and the rotor 23 in the axial direction. The first stator 24-1 and the second stator 24-2 provided in this manner, and the third stator 24-3 disposed on the outer peripheral portion in the radial direction with respect to the rotor 23 are accommodated in the housing 25. Configured.

  The rotor 23 is disposed in the rotor core 31 composed of a soft magnetic material or the like, and is disposed in the outer circumferential portion and the permanent magnet 32-1 that is disposed in the circumferential direction with respect to the rotating shaft. A triangular space is formed by the permanent magnet 32-2 that is attached in the radial direction with respect to the rotation axis, and the two permanent magnets 32-1 and 32-1 of the triangle have the same magnetic pole (for example, N or S). The configuration of each of the first stator 24-1, the second stator 24-2, and the third stator 24-3 is basically the same as the stator structure of a conventional axial gap rotating electrical machine. That is, the position of the first stator 24-1 and the second stator 24-2 facing the outer surface of the rotor 23 in the circumferential direction of the surface facing the rotor 23 and the third stator 24-3. In addition, a stator is configured by disposing stator teeth 34 each having a stator coil 33 wound at a predetermined interval.

  The state of the triangular space by the permanent magnets 32-1 and 32-2 in the rotor core 31 in this example is three-dimensionally shown as a perspective view in FIG. In this embodiment, a permanent magnet 32-2, a stator 24-3, a magnetic flux loop as a radial gap motor that forms a magnetic flux flow to the adjacent permanent magnet 32-2, a permanent magnet 32-2, and a permanent magnet. Magnetic flux is generated by a magnetic flux loop as an axial gap type motor that forms a magnetic flux flow through the stator 24-1 with different magnetic poles surrounded by 32-1, and the magnetic flux flow peculiar to this example is shown in FIG. Shown in (b). As shown in FIG. 2B, the inner side of the rotor of the permanent magnet 32-2 is surrounded by the permanent magnet 32-1 arranged in the radial direction of the same pole. The inner side of the rotor is an S pole, and the magnetic flux that moves the permanent magnet 32-2 in the rotor radial direction from the inner side of the rotor is attracted to the stator 24-3 by generating a magnetic flux in the same direction in the stator teeth 34 by the coil 33. Further, the flow of magnetic flux is controlled by the stator 24-1 via the back yoke 25 to the adjacent phase that is the S pole surrounded by the permanent magnet 32-2 and the permanent magnet 32-1. The phase with the N pole on the rotor inner side is controlled so that the magnetic flux flows to the phase adjacent to the N pole on the rotor inner side via the stator 24-1, the back yoke 25, and the stator 24-3. That is, the magnet torque can be increased by the amount of increase in the magnet amount.

  In the example shown in FIGS. 2A, 2 </ b> B, and 3, the permanent magnet 32-2 and the permanent magnet 32 are changed by changing the arrangement of the permanent magnets 32-1 and 32-2 in the rotor 23 as described above. The reluctance torque can be increased by ensuring the area of the soft magnetic body of the road tercore 31 surrounded by -1 facing the stator 24-1. Therefore, as described above, the magnet torque can be increased, the reluctance torque can be increased, and the torque of the entire rotating electrical machine can be increased.

  4 (a) and 4 (b) are diagrams for explaining other examples of the axial gap type rotating electrical machine of the present invention. Here, FIG. 4 (a) is a view showing a part of the rotor and the added stator in a longitudinal section for simplifying the description of the changes in the rotor and the stator, and FIG. 4 (b) is a view of FIG. 4 (a). It is a figure which shows the cross section along OX in. In the example shown in FIGS. 4A and 4B, the same members as those in the example shown in FIGS. 2A and 2B are denoted by the same reference numerals, and the description thereof is omitted.

  4 (a) and 4 (b) is different from the example shown in FIGS. 2 (a) and 2 (b) in that the arrangement of the permanent magnets in the rotor core 31 constituting the rotor 23 is arranged in the radial direction. The permanent magnet 32-1 magnetized in the circumferential direction with respect to the rotating shaft, and the permanent magnet 32-2 magnetized in the radial direction with respect to the rotating shaft disposed in the inner peripheral portion. A U-shaped space having an opening on the outer peripheral side is formed, and U-shaped permanent magnets are arranged so that the magnetic poles face each other. Reference numeral 41 denotes a shaft that is connected to the rotor 23 and serves as a rotating shaft.

  In the example shown in FIGS. 4A and 4B, the rotor core utilization can be improved by changing the arrangement of the permanent magnets 32-1 and 32-2 in the rotor 23 as described above, and the reluctance torque can be improved. Can be increased. Further, in addition to the first stator 24-1 and the second stator 24-2 provided with the rotor 23 sandwiched in the axial direction, a third stator 24-3 is provided on the outer peripheral portion of the rotor 23, thereby rotating the rotor 23. The torque of the entire electric machine can be increased.

  In the present example, the third stator 24-3 is provided on the radially outer peripheral portion of the rotor 23, but the present invention is not limited to this configuration. For example, even if the third stator 24-3 is provided on the radially inner periphery of the rotor 23, or the third stator 24-3 is provided on each of the radially outer periphery and the radially inner periphery of the rotor 23. However, the same effect can be obtained.

  FIGS. 5A and 5B are views for explaining still another example of the axial gap type rotating electrical machine of the present invention. Here, FIG. 5 (a) is a view showing a part of the rotor and the added stator in a longitudinal section in order to simplify the description of the changes in the rotor and the stator, and FIG. 5 (b) is a diagram of FIG. 5 (a). It is a figure which shows the cross section along OX in. In the examples shown in FIGS. 5A and 5B, the same members as those in the examples shown in FIGS. 2A and 2B are denoted by the same reference numerals, and the description thereof is omitted.

  5A and 5B is different from the example shown in FIGS. 2A and 2B in that the arrangement of the permanent magnets in the rotor core 31 constituting the rotor 23 is arranged in the radial direction. Permanent magnet 32-1 magnetized in the circumferential direction with respect to the rotating shaft, and permanent magnet 32-2 disposed in the outer peripheral portion and magnetized in the radial direction with respect to the rotating shaft. A U-shaped space having an opening on the side is formed, and U-shaped permanent magnets are arranged so that the same magnetic poles face each other, and the third stator 24-3 is disposed on the radially inner periphery of the rotor 23. This is the point. Reference numeral 41 denotes a shaft that is connected to the rotor 23 and serves as a rotating shaft.

  Also in the example shown in FIGS. 5A and 5B, the rotor core utilization can be improved by changing the arrangement of the permanent magnets 32-1 and 32-2 in the rotor 23 as described above, and the reluctance torque can be improved. Can be increased. Further, in addition to the first stator 24-1 and the second stator 24-2 provided with the rotor 23 sandwiched in the axial direction, a third stator 24-3 is provided on the inner peripheral portion of the rotor 23. The torque of the entire rotating electrical machine can be increased.

  In the present example, the third stator 24-3 is provided on the radially inner periphery of the rotor 23, but the present invention is not limited to this configuration. For example, even if the third stator 24-3 is provided on the radial outer peripheral portion of the rotor 23, or the third stator 24-3 is provided on each of the radial outer peripheral portion and the radial inner peripheral portion of the rotor 23. The same effect can be obtained.

  FIGS. 6A and 6B are views for explaining still another example of the axial gap type rotating electrical machine of the present invention. Here, FIG. 6A is a view showing a part of the rotor and the added stator in a longitudinal section for simplifying the description of the changes in the rotor and the stator, and FIG. It is a figure which shows the cross section along OX in. In the example shown in FIGS. 6A and 6B, the same members as those in the example shown in FIGS. 2A and 2B are denoted by the same reference numerals, and the description thereof is omitted.

  6 (a) and 6 (b) is different from the example shown in FIGS. 2 (a) and 2 (b) in that the arrangement of the permanent magnets in the rotor core 31 constituting the rotor 23 is arranged in the radial direction. The permanent magnet 32-1 magnetized in the circumferential direction with respect to the rotating shaft, the permanent magnet 32-2 magnetized in the radial direction with respect to the rotating shaft, arranged on the inner peripheral portion, and the outer periphery And a permanent magnet 32-2 magnetized in the radial direction with respect to the rotating shaft, a rectangular space is formed, and the rectangular permanent magnet is disposed so that the magnetic poles face each other, and the rotor 23 The third stator 24-3 is provided on each of the radial inner periphery and the radial outer periphery. In this example, the first stator 24-1 is not provided, and a shaft 41 that is connected to the rotor 23 and serves as a rotating shaft is provided in that portion.

  In the example shown in FIGS. 6A and 6B, the rotor core utilization can be improved by changing the arrangement of the permanent magnets 32-1 and 32-2 in the rotor 23 as described above, and the reluctance torque can be improved. Can be increased. Further, in addition to the first stator 24-1 and the second stator 24-2 provided with the rotor 23 sandwiched in the axial direction, a third stator 24-3 is provided on the inner peripheral portion of the rotor 23. The torque of the entire rotating electrical machine can be increased.

  In this example, the third stator 24-3 is provided in each of the radially inner peripheral portion and the radially outer main portion of the rotor 23. However, the present invention is not limited to this configuration. For example, even if the third stator 24-3 is provided only in the radial outer peripheral portion of the rotor 23, or the third stator 24-3 is provided only in the radial inner peripheral portion of the rotor 23, the same effect is obtained. Can be obtained.

  The axial gap type rotating electrical machine of the present invention is an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are disposed so as to face each other along the rotation axis, and can improve the rotor core utilization rate and increase the reluctance torque. Even if the reluctance torque is increased, it can be suitably used for an application that can increase the total torque with the magnet torque.

It is a figure for demonstrating an example of the axial gap type rotary electric machine of this invention. (A), (b) is a figure for demonstrating an example of the axial gap type rotary electric machine of this invention, respectively. It is a figure which shows the state of the triangular space by the permanent magnet in the rotor core in the example shown in FIG. (A), (b) is a figure for demonstrating the other example of the axial gap type rotary electric machine of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of the axial gap type rotary electric machine of this invention, respectively. (A), (b) is a figure for demonstrating the further another example of the axial gap type rotary electric machine of this invention, respectively. (A), (b) is a figure for demonstrating an example of the rotor in the conventional axial gap type rotary electric machine, respectively.

Explanation of symbols

1, 21 Axial gap type rotating electrical machine 2 Rotor shaft 3, 23 Rotor 4-1, 4-2, 24-1, 24-2, 24-3 Stator 5, 25 Housing 5a Peripheral wall 6-1, 6-2 Bearing 7 , 31 Rotor core 8-1, 8-2, 32-1, 32-2 Magnet 9-1, 9-2 Stator core 10-1, 10-2, 33 Coil 11-1, 11-2, 34 Stator teeth 41 Shaft

Claims (5)

  An axial gap type rotating electrical machine comprising a rotor having a permanent magnet and a stator having a stator coil and having a structure in which at least one rotor and at least one stator are arranged in an axial direction. A permanent magnet magnetized in the direction and a permanent magnet magnetized in the radial direction with respect to the rotating shaft are provided on the rotor, and the radial outer periphery and / or the radial inner periphery of the rotor are arranged in the axial direction. An axial gap type rotating electrical machine characterized in that a stator different from the stator is provided.   A triangular space with a permanent magnet arranged in the circumferential direction with respect to the rotating shaft and a permanent magnet arranged in the outer periphery with a magnet magnetized in the radial direction with respect to the rotating shaft The rotor having a configuration in which triangular permanent magnets are arranged so that the same magnetic poles face each other is disposed so as to be sandwiched between the first stator and the second stator in the axial direction, and the third stator is disposed on the outer peripheral portion in the radial direction. The axial gap type rotating electrical machine according to claim 1, wherein:   A permanent magnet that is arranged in the radial direction and is magnetized in the circumferential direction with respect to the rotation axis, and a permanent magnet that is arranged in the inner circumference and is magnetized in the radial direction with respect to the rotation axis. A U-shaped space having an opening is formed, and a rotor having a U-shaped permanent magnet arranged so that the magnetic poles face each other is sandwiched between the first stator and the second stator in the axial direction. 2. The axial gap type rotating electric machine according to claim 1, wherein the third stator is disposed on the radially outer peripheral portion and / or the radial inner peripheral portion.   A permanent magnet that is arranged in the radial direction and is magnetized in the circumferential direction with respect to the rotation axis, and a permanent magnet that is arranged in the outer circumference and is magnetized in the radial direction with respect to the rotation axis. A U-shaped space having an opening is formed, and a rotor having a U-shaped permanent magnet arranged so that the magnetic poles face each other is sandwiched between the first stator and the second stator in the axial direction. 2. The axial gap type rotating electric machine according to claim 1, wherein the third stator is disposed on the radially outer peripheral portion and / or the radial inner peripheral portion.   Permanent magnets that are radially arranged with respect to the rotational axis, permanent magnets that are radially arranged with respect to the rotational axis, and permanent magnets that are radially arranged with respect to the rotational axis. A rotor having a configuration in which a rectangular space is formed by the arranged permanent magnets that are magnetized in a radial direction with respect to the rotation shaft, and the rectangular permanent magnets are arranged so that the same magnetic poles face each other, is used as the first stator. 2. The axial gap type rotation according to claim 1, wherein the third stator is disposed in the radial direction outer peripheral portion and / or the radial direction inner peripheral portion while being disposed so as to be sandwiched between the second stator and the second stator in the axial direction. Electric.

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