JP2007215289A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine for inhibiting an induced voltage from being excessive when a rotor is rotated at a high speed, and having coils easily assembled to teeth. <P>SOLUTION: The teeth member 16 is disposed on an outer circumference of the rotor 13 having a plurality of permanent magnets 14. The teeth member 16 has a plurality of the teeth 15 circumferentially disposed at a regular interval, radially extended and internally coupled. An annular yoke 18 is turnably provided outside the teeth 15 relative to the teeth member 16, and alternately provided with a portion 18a for easily flowing a magnetic flux, and a portion 18b for difficultly flowing the magnetic flux at a circumferential interval of the teeth 15. The yoke 18 has teeth 22 on an outer circumference, and is rotated by a motor 24 through a rotating shaft 26 having a gear 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electric machine, and more particularly to a rotating electric machine having a permanent magnet in a rotor.

  Many electric motors in which a permanent magnet is embedded in a rotor are used for reasons such as low loss, high efficiency, and high output. In this electric motor, the magnetic flux from the rotor is constant. Therefore, in order to prevent the induced voltage from becoming excessive during high-speed rotation, the field-weakening current is applied during high-speed rotation. However, the efficiency during high-speed rotation is deteriorated by passing a field weakening current.

There has been proposed a magnetic flux control device for a permanent magnet electric motor capable of suppressing an induced voltage from becoming excessive during high-speed rotation (see Patent Document 1). The magnetic flux control device of the permanent magnet type motor includes a rotor rotatably supported by a housing and provided with a permanent magnet, a comb portion (tooth portion) fixed to the housing on the outer peripheral side of the rotor, and a space between the comb portions. A stator core having a slot portion, and a stator composed of a winding (coil) wound around the slot portion. The outer peripheral side of the stator has a cylindrical member whose inner peripheral surface is disposed so as to be rotatable relative to the stator and has a circular cross section, and a drive device that moves the cylindrical member relative to the stator. Yes. The cylindrical member is formed with magnetic path control concave grooves extending in the longitudinal direction with inner circumferential surfaces cut out at equal intervals in the circumferential direction, and the inner circumferential surfaces of the convex portions between the concave grooves are A surface that slides in close contact with the outer peripheral surface of the stator is formed. In this device, the flow of magnetic flux is reduced when the concave groove corresponds to the comb portion of the stator core in the radial direction, and the flow of magnetic flux increases when the convex portion corresponds to the comb portion in the radial direction. Therefore, it is possible to prevent the induced voltage from becoming excessive by causing the concave groove to correspond to the comb portion of the stator core in the radial direction during high-speed rotation of the rotor.
JP 2002-204556 A

  However, in the device described in Patent Literature 1, the stator core is formed in an annular shape as a whole by connecting the comb portions on the outside. Since the comb portions have a constant width and the interval between the comb portions becomes narrower toward the inner side, it is difficult to wind the winding around the comb portions (tooth portions). Further, in a so-called IPM (interior Permanent Magnetic) motor in which a permanent magnet is embedded in a rotor, it is desirable to widen the inner portion of the comb portion, that is, to reduce the interval between adjacent comb portions in order to reduce torque ripple. In the configuration of Document 1, in that case, it is more difficult to wind the winding around the comb portion.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to suppress an induced voltage from becoming excessive during high-speed rotation of the rotor and to easily form a coil with respect to the tooth portion. It is in providing the rotary electric machine which can be assembled | attached to.

  In order to achieve the above object, the invention according to claim 1 is a rotating electrical machine including a rotor having a plurality of permanent magnets, and is disposed on the outer peripheral side of the rotor, and the plurality of teeth portions are arranged in the circumferential direction. A tooth member formed in a radially extending state at a predetermined interval and connected inward, a support member for supporting the tooth member, a coil wound around the tooth portion, and a tooth member Provided on the outside so as to be relatively rotatable with the tooth member, and are provided with an annular portion and a portion where the magnetic flux easily flows between the tooth portion and a portion where it is difficult to flow corresponding to the circumferential interval of the teeth portion. And a drive means for relatively rotating the tooth member and the yoke part.

  In the present invention, the teeth member and the yoke portion are relatively rotated by the operation of the driving means. By changing the relative rotation amount of the tooth member and the yoke portion from the reference position, the positional relationship between the tooth portion and the portion of the yoke portion where the magnetic flux hardly flows changes. As the area of the teeth portion and the portion of the yoke portion where the magnetic flux does not easily flow is larger, the magnetic flux is less likely to flow between the tooth portion and the yoke portion. Therefore, by adjusting the relative rotation amount of the teeth member and the yoke portion so that the area where the teeth portion and the portion where the magnetic flux of the yoke portion is difficult to flow is increased during high-speed rotation, the field weakening is reduced during high-speed rotation of the rotor. Even if the current is reduced, the induced voltage can be suppressed from becoming excessive. In addition, since each tooth portion is connected on the inside, that is, opened on the outside, an operation of assembling a coil with respect to the tooth portion, that is, winding a direct winding around the tooth portion to form a coil, or winding it in another place in advance. The operation | work which fits the assembled coil in the teeth part and assembles can be performed easily.

  According to a second aspect of the present invention, in the first aspect of the present invention, the tooth member is fixed at a predetermined position, and the yoke portion is rotatable by the driving means. Therefore, in the present invention, the structure is simplified as compared with a configuration in which the positional relationship between the tooth portion and the portion where the magnetic flux of the yoke portion is difficult to flow is changed by rotating the tooth member.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the tooth member is supported by the support member at both axial ends of the tooth portion. In this invention, it becomes easy to hold | maintain a teeth member in the stable state compared with the structure which hold | maintains a teeth member in a cantilever state.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the tooth portion has an inner width wider than an outer width. Therefore, in the present invention, torque ripple can be reduced as compared with the case where the width of the tooth portion is constant.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the portion where the magnetic flux easily flows is configured by a convex portion protruding toward the teeth portion side. Yes. In this invention, since the distance between the tooth portion and the yoke portion is close in a state where the tooth portion is opposed to the convex portion, the magnetic flux easily flows between the tooth portion and the yoke portion in the portion, and both sides of the convex portion are Magnetic flux is difficult to flow. Protruding parts on the yoke part make it difficult for the magnetic flux to flow by forming a part of the yoke part from another material or modifying it, and the part adjacent to the part where the magnetic flux is difficult to flow is relatively It can be made simpler than the configuration in which the magnetic flux easily flows.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to suppress that an induced voltage becomes excessive at the time of high-speed rotation of a rotor, a coil can be easily assembled | attached with respect to a teeth part.

Hereinafter, an embodiment in which the present invention is embodied in an electric motor will be described with reference to FIGS.
As shown in FIG. 1, a rotor 13 fixed to a rotary shaft 12 is rotatably supported by a housing 11 of an electric motor 10 via a bearing (not shown). Four permanent magnets 14 are embedded in the rotor 13 at regular intervals in the circumferential direction. That is, the rotor 13 has a plurality of permanent magnets 14.

  On the outer peripheral side of the rotor 13, a tooth member 16 is disposed in which a plurality of tooth portions 15 extend radially in the circumferential direction and are connected inward. Each teeth portion 15 is formed so that the inner width (side closer to the rotor 13) is wider than the outer width. More specifically, each tooth portion 15 does not gradually increase in width from the outside to the inside, but most (for example, 90%) has a constant width, and only the portion close to the inside gradually increases in width. Is formed. A coil 17 is wound around each tooth portion 15 by concentrated winding. In the figure, the hatching of the rotor 13 is omitted, and the tooth portion 15 and the coil 17 are shown without being broken.

  A yoke portion 18 is provided outside the teeth portion 15 so as to be rotatable relative to the tooth member 16. In this embodiment, the tooth member 16 is fixed, and the yoke portion 18 is configured to be rotatable. The yoke portion 18 is formed in an annular shape and is rotatably supported by the housing 11. The yoke portion 18 is provided with alternately the portions 18a in which the magnetic flux easily flows between the yoke portions 18 and the portions 18b in which the magnetic flux hardly flows corresponding to the circumferential interval of the teeth portions 15. Six portions 18a and 18b that are difficult to flow are provided. In this embodiment, the part 18a in which the magnetic flux easily flows is constituted by a convex part protruding toward the tooth part 15 side, and the circumferential length of the part facing the outer end part of the tooth part 15, that is, the convex part The circumferential length of the tip is formed to be the same as the width of the outer end of the tooth portion 15.

  Next, the support state of the tooth member 16 and the yoke portion 18 will be described in detail. As shown in FIG. 3, the tooth member 16 has a cylindrical portion 16a, and convex portions 16b are provided on the outer side of the cylindrical portion 16a in a radial direction so that the tooth portion 15 and the supported portion 19 are formed. ing. The supported portion 19 is provided at the center of each convex portion 16 b and is formed integrally with the tooth portion 15, and is longer in the radial direction than the tooth portion 15. Although the coil 17 is wound around the tooth portion 15 and assembled with the support member 20 and the yoke portion 18, the coil 17 is not shown in FIG. 3 and FIG.

  The support member 20 that supports the tooth member 16 is formed in an annular shape with the same thickness as the length of the tooth member 16 in the axial direction of the supported portion 19, and is fitted to each supported portion 19 inside. A portion 20a is formed. As shown in FIG. 2, the support member 20 is housed in a housing portion 23 a having a substantially circular cross section provided in the housing 11, and is fixed to the housing 11 via bolts 21 at the outer peripheral portion. The support member 20 supports the tooth member 16 in a state where the fitting portion 20 a is fitted to the supported portion 19. That is, the tooth member 16 is supported by the support member 20 at the center.

  As shown in FIG. 3, two yoke portions 18 are provided, and each yoke portion 18 is disposed on both sides of a support member 20 that supports the tooth member 16. The yoke portion 18 has a tooth portion 22 formed on a part of the outer periphery. The tooth portion 22 is formed over a wider range than the angle range corresponding to the maximum amount of rotation of the yoke portion 18. As shown in FIG. 1, the yoke portion 18 is rotatably accommodated in a housing portion 23b having a substantially circular cross section provided in the housing 11 on the outer peripheral surface thereof with a part of the tooth portion 22 exposed. ing. The accommodating portion 23b is formed coaxially with the accommodating portion 23a of the tooth member 16, and in this embodiment, the accommodating portions 23a and 23b are formed to have the same diameter.

  As shown in FIG. 1, a motor 24 that can be driven to rotate in the forward and reverse directions is fixed to the housing 11 and constitutes a driving means for relatively rotating the tooth member 16 and the yoke portion 18. Further, the housing 11 is provided with a rotating shaft 26 provided with a gear 25 that is rotated by a motor 24 and meshes with the tooth portion 22 of each yoke portion 18. Then, the rotating shaft 26 is rotated by the motor 24, whereby the yoke portion 18 is rotated. The tooth portion 22, the motor 24, the gear 25 and the rotating shaft 26 constitute driving means for relatively rotating the tooth member 16 and the yoke portion 18.

  The teeth member 16 and the yoke portion 18 configured as described above constitute a stator of the electric motor 10. That is, the stator generates a path of magnetic flux that is generated by the permanent magnet 14 of the rotor 13 and flows into the yoke part 18 through the tooth part 15 and a path of magnetic flux that flows from the yoke part 18 into another tooth part 15. Is rotated with respect to the tooth member 16 so that the magnetic flux can be easily and easily adjusted.

  Next, an electrical configuration for controlling the electric motor 10 configured as described above will be described with reference to FIG. The electric motor 10 is connected to the inverter 30. The controller 31 that controls the inverter 30 includes a CPU (Central Processing Unit) 32 and a memory 33. The controller 31 is electrically connected to a rotation sensor 34 that detects the rotational speed of the rotor, a current sensor 35 that detects a current value of a current supplied from the inverter 30 to the electric motor 10, and a voltage sensor 36 that detects a terminal voltage of the electric motor 10. Connected and the detection signal of each sensor is inputted. The CPU 32 of the controller 31 controls the electric motor 10 to be a target output based on detection signals from the sensors 34, 35, and 36.

  The controller 31 drives the motor 24 so that the portion 18a where the magnetic flux of the yoke portion 18 easily flows is opposed to the teeth portion 15 over the entire surface, that is, the state shown in FIG. The position of the yoke portion 18 is set by control. The controller 31 outputs the normal rotation command or the reverse rotation command to the motor 24 with the position in the state of FIG. 1 as the reference position of the yoke portion 18 and rotates the yoke portion 18 so that the magnetic flux in the yoke portion 18 is easy to flow. The opposing area of 18a and the outer end surface of the teeth part 15 is changed. In order to prevent the induced voltage from becoming excessive in the medium speed range and the high speed range, the controller 31 rotates the yoke portion 18 from the reference position so that the portion 18b where the magnetic flux does not easily flow is opposed to the teeth portion 15 in part. Place it at the position you want. In the high speed range, the electric motor 10 is controlled by a known field weakening control as necessary.

  An induced voltage is generated at the terminal of the electric motor 10 as the rotor 13 rotates, and the induced voltage increases as the rotational speed increases. In addition, the induced voltage increases as the facing area between the portion 18 a where the magnetic flux of the yoke portion 18 easily flows and the outer end surface of the tooth portion 15 is larger. These relationships are as shown in FIG. 5A, for example. That is, the induced voltage is proportional to the rotation speed, and the induced voltage decreases as the angle of displacement of the yoke portion 18 from the reference position is increased.

  Further, the hybrid motor travel motor has a required characteristic of rotational speed-torque as shown in FIG. 5B, for example. That is, the torque decreases in inverse proportion to the rotational speed so that the maximum torque is ensured in the low speed range and the constant output is obtained in the medium speed range and the high speed range. FIG. 5C shows an example of the terminal voltage of the electric motor 10 with respect to the rotation speed when the field weakening control is performed in the medium speed range and the high speed range, and the terminal voltage of the electric motor 10 is controlled to the upper limit value or less. The upper limit value is determined by the DC link voltage of the inverter 30.

  A map showing the relationship between the rotational speed created based on FIGS. 5A to 5C and the shifting angle of the stator, that is, the rotational angle from the reference position of the yoke portion 18 and the rotational speed, for example, FIG. A map shown in a) is stored in the memory 33. Based on the map, the controller 31 determines the stator shift angles in the low speed range, medium speed range, and high speed range corresponding to the required rotational speed, and outputs a control command to the motor 24 so that the shift angles are obtained. It has become. In addition, when the electric motor 10 rotates, the controller 31 controls the motor 24 so that the stator 18 is positioned at a position where the portion 18 a does not face the tooth portion 15 regardless of the rotational speed of the rotor 13. A control command is output to. The case where the electric motor 10 rotates is a case where, for example, the electric motor 10 is used as a traveling motor of a hybrid vehicle, and the rotor 13 rotates by traveling of the vehicle without supplying current from the inverter 30 to the electric motor 10. May be.

Next, the operation of the electric motor 10 configured as described above will be described.
The electric motor 10 is basically started from a state where the stator shift angle is 0 degrees, that is, from the state in which the teeth portion 15 and the yoke portion 18 are arranged as shown in FIG. In this state, the end face of the tooth portion 15 and the portion 18a where the magnetic flux of the yoke portion 18 easily flows are opposed to each other, and the magnetic flux is a conventional IPM configured such that the tooth member 16 and the yoke portion 18 do not rotate relative to each other. Like the motor, it flows so as to pass through the entire end surface of the tooth portion 15.

  The controller 31 confirms the rotational speed of the rotor 13 from the detection signal of the rotation sensor 34, and when the rotational speed increases to the middle speed range, the stator shift angle corresponding to the rotational speed is based on the map shown in FIG. A control command is output to the motor 24 so that When the motor 24 is driven, the gear 25 is rotated together with the rotating shaft 26, and the rotation of the gear 25 is transmitted to the tooth portion 22 of the yoke portion 18 so that both yoke portions 18 are rotated in the same direction. . Then, the electric motor 10 is operated in a state where the stator shift angle is set to a predetermined value. In other words, in the middle speed range and the high speed range, the shifting angle is controlled to increase in proportion to the rotation speed, and field weakening is performed.

  In the middle speed range, the arrangement of the portion 18a through which the magnetic flux easily flows and the outer end face of the tooth portion 15 is in the state shown in FIG. 7, for example. In this state, the shifting angle of the stator is approximately 12 degrees, and the area where the end surface of the teeth portion 15 and the portion 18a where the magnetic flux of the yoke portion 18 easily flows is approximately half that when the shifting angle is 0 degrees, The flow of magnetic flux is limited. As a result, the field can be weakened in the same manner as when the gap between the rotor 13 and the stator is widened, and the increase of the induced voltage can be suppressed, so that the weakening field current can be reduced or zero.

  In the high speed region, as shown in FIG. 8, the portion 18 a where the magnetic flux easily flows and the outer end face of the tooth portion 15 are arranged in a slightly corresponding state. In this state, the area where the end face of the tooth portion 15 and the portion 18a at which the magnetic flux of the yoke portion 18 easily flows is smaller than when the shift angle is 12 degrees, and the flow of the magnetic flux is further restricted. Become. As a result, the increase of the induced voltage is further suppressed, and the field weakening current can be further reduced.

  FIG. 6B shows the relationship among the rotational speed of the rotor 13, the shift angle, and the input current to the electric motor 10. As can be seen from FIG. 6B, when the operation is performed from the low speed range to the high speed range with the shift angle being constant, the input current becomes smaller as the shift angle is smaller when the rotation speed is lower than the predetermined rotation speed in the medium speed range. When the rotation speed exceeds a predetermined rotational speed in the middle speed range, the input current increases as the shift angle decreases. However, by increasing the stator shift angle corresponding to the rotational speed, the electric motor 10 operates so that the input current becomes as shown by the bold line in FIG. 6B as the rotational speed increases. As compared with the case where the shift angle is 0 degree, the field-weakening current becomes smaller. As a result, the amount of current supplied to the electric motor 10 can be reduced, and copper loss can be reduced.

  When the electric motor 10 is in a rotating state, the controller 31 stops the current supply to the electric motor 10 and changes the stator shift angle as shown in FIG. 9 regardless of the rotational speed of the rotor 13. A control command is output to the motor 24 so that 18a becomes a shift angle (for example, 30 degrees) of a stator arranged at a position not facing the tooth portion 15.

According to this embodiment, the following effects can be obtained.
(1) The teeth member 16 and the yoke portion 18 are relatively rotated by the operation of the motor 24, and the magnetic flux between the teeth portion 15 and the yoke portion 18 is changed by changing the relative rotation amount of the yoke portion 18 from the reference position. The positional relationship with the portion 18a that easily flows changes. Therefore, the rotor 13 is adjusted by adjusting the relative rotation amount of the tooth member 16 and the yoke portion 18 so that the area where the teeth portion 15 and the portion 18b where the magnetic flux of the yoke portion 18 does not flow easily increases during high-speed rotation. Even if the field-weakening current is reduced during high-speed rotation, the induced voltage can be prevented from becoming excessive. As a result, the amount of current supplied to the electric motor 10 is reduced, the copper loss is reduced, and the efficiency of the electric motor 10 is improved.

  (2) Since each tooth part 15 is connected inside, the work of assembling the coil 17 with respect to the tooth part 15, that is, winding the direct winding around the tooth part 15 to form the coil 17, or winding it in another place in advance. The operation | work which fits the assembled coil 17 in the teeth part 15 and assembles | assembles can be performed easily.

  (3) The teeth member 16 is fixed at a predetermined position, and the yoke portion 18 can be rotated by the motor 24. Therefore, the structure is simplified as compared with the configuration in which the tooth member 16 is rotated to change the positional relationship between the tooth portion 15 and the portion 18a through which the magnetic flux of the yoke portion 18 easily flows.

  (4) The teeth member 16 is supported by the support member 20 at the center thereof. Therefore, it becomes easier to hold the tooth member 16 in a stable state as compared with the configuration in which the tooth member 16 is held in a cantilever state.

(5) The teeth portion 15 is formed so that the inner width is wider than the outer width. Therefore, torque ripple can be reduced as compared with the case where the width of the tooth portion 15 is constant.
(6) The part 18a formed in the yoke part 18 where the magnetic flux easily flows is formed by a convex part protruding toward the tooth part 15 side. Therefore, since the distance between the tooth portion 15 and the yoke portion 18 is reduced in a state where the tooth portion 15 faces the convex portion, the magnetic flux easily flows between the tooth portion 15 and the yoke portion 18. Protruding portions are provided on the yoke portion 18 because a portion of the yoke portion 18 is formed of a different material or modified to make it difficult for the magnetic flux to flow, and the portion adjacent to the portion 18b where the magnetic flux does not flow easily. By making the magnetic flux relatively easy to flow, the portion 18a where the magnetic flux easily flows and the portion 18b where the magnetic flux hardly flows can be simplified as compared with the configuration in which the magnetic flux is relatively easy to flow.

  (7) The portion 18 a where the magnetic flux easily flows is formed so that the circumferential length of the portion facing the outer end portion of the tooth portion 15 is the same as the width of the outer end portion of the tooth portion 15. Therefore, the ease of passing the magnetic flux can be changed in proportion to the amount of rotation of the yoke portion 18 from the reference position, that is, the stator shift angle.

  (8) The tooth member 16 is formed so that the supported portion 19 protrudes outward from the tooth portion 15, and is supported by being fitted to the fitting portion 20 a of the support member 20 at the protruding portion. Therefore, the support member 20 does not interfere with the coil 17.

  (9) The tooth member 16 is formed such that the supported portion 19 is positioned in the same straight line as each tooth portion 15 with the same thickness as the tooth portion 15. Accordingly, when forming the tooth portion 15 and the supported portion 19 by processing the cylindrical member, the processing becomes easier as compared to the case where the supported portion 19 and the tooth portion 15 are not located on the same straight line.

  (10) When the electric motor 10 is rotated, the yoke portion 18 is disposed at a position where the portion 18 b where the magnetic flux hardly flows is opposed to the tooth portion 15. Therefore, it is possible to suppress heat generation due to iron loss particularly in a high speed region.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The teeth member 16 is not limited to the structure supported by the support member 20 at the center, and may be a structure supported in a cantilever state or a structure supported on both sides. Correspondingly, the number of yoke portions 18 is one. As a structure in which the tooth member 16 is supported in a cantilever state, for example, there is a structure in which the tooth portion 15 provided on one side of the supported portion 19 in the embodiment is eliminated.

  As a structure in which the tooth member 16 is supported on both sides, for example, as shown in FIG. 10 (a), the tooth portion 15 is disposed at the center of the tooth member 16, and the supported portion 19 is continuous on both sides. The structure is formed as follows. Then, both supported portions 19 are supported by an annular support member 20. Further, the outer diameter of the yoke portion 18 is formed to be slightly larger than the outer diameter of the support member 20, the yoke portion 18 is rotatably supported on the housing 11, and the support member 20 is fixed to the housing 11 with bolts 21. When the teeth member 16 or the like is assembled to the housing 11, the yoke part 18 is disposed outside the tooth part 15, and the assembly is performed with the support member 20 fitted to the supported part 19 with the yoke part 18 interposed therebetween. Is assembled to the housing 11. When the tooth member 16 is inserted into the yoke portion 18, the supported portion 19 is inserted at a position corresponding to the portion 18b where the magnetic flux hardly flows so that the supported portion 19 does not interfere with the portion 18a where the magnetic flux easily flows. good. Thereafter, the rotating shaft 26 and the motor 24 are assembled to the housing 11. The tooth member 16 is supported by the support member 20 at both axial ends of the tooth portion 15. Also in this case, the tooth member 16 can be held in a stable state as compared with the configuration in which the tooth member 16 is held in a cantilever state, and the tooth member 16 is held in a more stable state than when the tooth member 16 is supported at the center. can do.

  The supported portion 19 is not limited to a configuration in which the supported portion 19 has the same thickness as the tooth portion 15 and is continuous with each tooth portion 15. For example, as shown in FIGS. 10B and 10C, a gap may be formed between each tooth portion 15. In the case where there is a gap between each tooth portion 15 and the supported portion 19, the coil 17 may be wound only on the tooth portion 15 without being wound around the supported portion 19. Each tooth part 15 and the supported part 19 may have a shape that is not located on the same straight line extending in parallel with the axial direction of the tooth member 16. However, processing is easier when the shape is located on the same straight line.

The support member 20 is not limited to the annular shape, and the supported portion 19 may be held by the support member 20 divided into a plurality of parts.
The support member 20 is not limited to a configuration that supports the tooth member 16 by fitting the fitting portion 20a, but may be supported by adhesion, welding, screwing, or the like. In this case, the supported portion 19 does not need to protrude.

  The yoke portion 18 may be fixed at a predetermined position, and the tooth member 16 may be configured to be rotatable by driving means. For example, in each of the above embodiments, the yoke portion 18 is fixed to the housing 11 with the bolt 21, the support member 20 is rotatably supported on the housing 11, and a tooth portion is formed on a part of the outer peripheral surface thereof. A rotating shaft 26 having a gear 25 that meshes with the tooth portion is driven by a motor 24.

  The two yoke portions 18 are not limited to be configured to be rotated in the same direction, and may be configured to be rotated in different directions. A motor 24 may be provided for each yoke portion 18, but a configuration in which both yoke portions 18 are rotated by a single rotating shaft 26 is preferable. For example, different numbers of gears are provided between the rotating shaft 26 and the tooth portion 22. In this case, since each yoke part 18 is rotated in the opposite direction synchronously, the forces in the direction of returning the yoke part 18 generated by bending the magnetic flux flow when the yoke part 18 is rotated are mutually connected. Therefore, the force required for the motor 24 to rotate the yoke portion 18 may be smaller than when the two yoke portions 18 are rotated in the same direction.

  The portion 18a that is provided on the inner side of the yoke portion 18 and through which the magnetic flux easily flows is not limited to the one formed by the convex portion. For example, the inner surface of the yoke portion 18 is formed as a curved surface having a constant distance from the central axis, and a portion 18b in which magnetic flux does not easily flow by embedding a material having a lower magnetic permeability than other portions at a predetermined interval with the surface exposed. The portion adjacent to the material having a low magnetic permeability may be a portion 18a where the magnetic flux easily flows. As a material with low magnetic permeability, a nonmagnetic material is preferable, and a nonmagnetic metal is more preferable. Therefore, for example, aluminum or the like is preferably used as the material of the portion 18b where the magnetic flux does not easily flow.

  The yoke portion 18 only needs to include the portion 18a in which the magnetic flux easily flows and the portion 18b in which the magnetic flux hardly flows corresponding to the circumferential interval of the teeth portion 15 in the inner portion, and the circumference of the portion 18a where the magnetic flux easily flows. The length in the direction is not limited to the width of the outer end portion of the tooth portion 15, and may be longer or shorter than the width. However, when the length is the same as the width, the tooth member 16 and the yoke portion 18 are rotated relative to each other, and the tooth member 15 is wasted when the area where the end surface of the tooth portion 15 faces the portion 18a is changed. There is no need to relatively rotate 16 and the yoke portion 18, and the control becomes simple.

  The motor 10 is not limited to the combination of the rotor 13 having four poles and the number of teeth 15 being six, that is, four poles and six slots. In that case, the relationship between the number of poles of the rotor 13 and the number of teeth portions 15 is generally 2: 3. When the number of teeth 15, that is, the number of slots is NS, the maximum value of the stator shift angle is 360 / NS / 2.

  The yoke portion 18 may be circular and the inner side is almost circular, and the outer shape does not need to be circular. In the configuration in which the tooth member 16 is rotatable with the yoke portion 18 fixed, it is easier to fix the yoke portion 18 at a predetermined position when the outer shape is other than a circle.

○ When the shape of the tooth portion 15 is a shape in which the inner width is formed wider than the outer width, the teeth portion 15 may be formed so as to gradually become wider from the outer side toward the inner side.
O It is good also considering the teeth part 15 as a shape of fixed width from the outside to the inside.

  The control system of the electric motor 10 is not limited to the configuration in which both the current sensor 35 and the voltage sensor 36 are provided, and one of the sensors is provided, and the value to be detected by the other sensor is the detection signal of the one sensor. You may make it calculate | require based on calculation.

The rotation speed may be calculated from the detection signal of the current sensor 35 or the voltage sensor 36 without providing the rotation sensor 34.
○ The coil 17 may be distributed winding instead of concentrated winding. In this case as well, the operation of assembling the coil 17 is simplified as compared with the conventional configuration in which the teeth 15 are connected on the outside.

  The electric motor 10 is not limited to the IPM motor in which the permanent magnet 14 is embedded in the rotor 13. For example, an SPM (Surface Permanent Magnet) motor in which a permanent magnet is disposed on the outer peripheral surface of the rotor, a PRM (Permanent Magnet Reluctance) motor having a salient pole on the rotor, or the like may be used.

O You may apply not only to the electric motor 10 but to a generator.
The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 5, in the portion where the magnetic flux easily flows, the circumferential length of the portion facing the outer end portion of the teeth portion is the teeth portion. It is formed to be the same as the width of the outer end portion.

  (2) In the invention according to any one of claims 1 to 5 and the technical idea (1), the support member is configured so that the teeth member has the same thickness as the teeth portion and each teeth portion. They are supported by supported portions provided so as to be positioned on the same straight line.

Sectional drawing of the electric motor in one Embodiment. Sectional drawing of the electric motor in the position corresponding to a supporting member. The disassembled perspective view which shows the relationship between a teeth member, a yoke part, and a supporting member. The block diagram which shows the control system of an electric motor. (A) is a graph which shows the relationship between a rotational speed and an induced voltage, (b) is a graph which shows the required characteristic of the travel motor for hybrid vehicles, (c) is a graph which shows the relationship between a rotational speed and terminal voltage. (A) is a map showing the relationship between the rotation speed and the stator shifting angle, and (b) is a graph showing the relationship between the rotation speed, the stator shifting angle and the input current. Sectional drawing of the electric motor which shows the relationship between the teeth part and yoke part in a medium speed area. Sectional drawing of the electric motor which shows the relationship between the teeth part and yoke part in a high speed region. Sectional drawing of the electric motor which shows the relationship between the teeth part and yoke part at the time of accompanying rotation. (A) is a disassembled perspective view which shows the relationship of the teeth member in another embodiment, a yoke part, and a supporting member, (b), (c) is a perspective view of the teeth member in another embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Electric motor as rotary electric machine, 13 ... Rotor, 14 ... Permanent magnet, 15 ... Teeth part, 16 ... Teeth member, 16b ... Convex part, 17 ... Coil, 18 ... Yoke part, 18a ... Part where magnetic flux easily flows, 18b A portion where magnetic flux does not easily flow, 20 a supporting member, 22 a tooth portion constituting a driving means, 24 a motor, 25 a gear, 26 a rotating shaft.

Claims (5)

A rotating electrical machine including a rotor having a plurality of permanent magnets,
A tooth member that is disposed on the outer peripheral side of the rotor and that is formed in a state in which a plurality of tooth portions extend radially in the circumferential direction and connected inward.
A support member for supporting the tooth member;
A coil wound around the teeth portion;
An outer portion of the tooth portion is provided so as to be rotatable relative to the teeth member, and an annular portion where magnetic flux easily flows between the teeth portion and a portion where magnetic flux does not easily flow correspond to the circumferential interval of the teeth portion. And the yoke part prepared alternately,
A rotating electrical machine comprising: a driving means for relatively rotating the tooth member and the yoke portion.   The rotating electrical machine according to claim 1, wherein the tooth member is fixed at a predetermined position, and the yoke portion is rotatable by the driving means.   The rotating electrical machine according to claim 1, wherein the tooth member is supported by the support member at both axial end portions of the tooth portion.   The rotating electrical machine according to any one of claims 1 to 3, wherein the teeth portion has an inner width wider than an outer width.   The rotating electrical machine according to any one of claims 1 to 4, wherein the portion in which the magnetic flux easily flows is configured by a convex portion that protrudes toward the teeth portion side.

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