JP2006174552A - Rotor structure for axial gap type dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor structure for axial gap type dynamo-electric machine which can increase the strength of retaining a permanent magnet without enlarging the thickness of a rotor or increasing the parts count and also can reduce the cogging torque. <P>SOLUTION: In an axial gap type dynamo-electric machine which is equipped with a rotor 2 where permanent magnets 12 and 12 are arranged and stators 3 and 3 which have a stator core 14 and stator coils 16, and whose rotor 2 and stators 3 and 3 are arranged axially, the permanent magnets 12 and 12 arranged in the above rotor 2 are mounted in plural numbers on a rotor plate 11, with their polarity alternated in its circumferential direction, and besides the mounting faces of the above permanent magnets 12 and 12 to the above rotor plate 11 constitute inclined mounting faces 12a and 12a which have tilt angles θ1 to the axial direction of the rotor. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to a technical field of a rotor structure of an axial gap type rotating electrical machine in which a stator and a rotor are arranged to face each other in the axial direction.

  The permanent magnet synchronous motor (IPMSM: Interior Permanent Magnet Synchronus Motor) with a permanent magnet embedded in the rotor and the surface magnet synchronous motor (SPMSM: Surface Permanent Magnet Synchronus Motor) with a permanent magnet attached to the rotor surface have low loss. Due to its high efficiency and large output (in addition to magnet torque, reluctance torque can also be used), its application range has been expanded to applications such as electric vehicle motors and hybrid vehicle motors.

Such a permanent magnet synchronous motor, in which an axial gap type motor in which a stator and a rotor are arranged to face each other in the axial direction, can be reduced in thickness and is used for applications where layout is limited (for example, patents) Reference 1).
Japanese Patent Laid-Open No. 11-187635

However, in the conventional axial gap type motor, since the permanent magnet is mounted on the surface of the rotor plate or is inserted by fitting in the axial direction, the rotor plate mounting surface of the permanent magnet is in the rotor axial direction. And the permanent magnet mounting area is limited and narrowed by the rotor thickness, so the retention strength of the permanent magnet to the rotor plate is low, peeling occurs at the magnet mounting part, and the axial direction of the permanent magnet There was a problem that omission might occur.
In addition, a plurality of permanent magnets are disposed in the circumferential direction with respect to the rotor plate. However, a large difference in magnetic attractive force is generated at the boundary between the permanent magnet portion and the rotor plate portion. There has been a problem that the generation of cogging torque due to a difference in static magnetic attraction force becomes large.
These problems are major issues for increasing the rotational speed and torque of the axial gap motor.

  The present invention has been made paying attention to the above problems, and can increase the holding strength of the permanent magnet and reduce the cogging torque without increasing the rotor thickness or increasing the number of parts. An object of the present invention is to provide a rotor structure for a gap type rotating electrical machine.

In order to achieve the above object, according to the present invention, an axial gap type rotating electrical machine includes a rotor having a permanent magnet disposed thereon, a stator having a stator core and a stator coil, and the rotor and the stator are disposed in an axial direction. ,
A plurality of permanent magnets arranged on the rotor are mounted on the rotor plate while alternately changing the polarity in the circumferential direction, and the mounting surface of the permanent magnet with respect to the rotor plate is inclined with respect to the rotor axial direction. An inclined mounting surface with a corner was used.

  Therefore, in the rotor structure of the axial gap type rotating electric machine according to the present invention, the permanent magnets mounted on the rotor plate while alternately changing the polarities in the circumferential direction have a mounting surface with respect to the rotor plate. The inclined mounting surface is inclined with respect to the direction. That is, the rotor plate mounting surface of the permanent magnet does not coincide with the rotor axial direction (magnet removal direction), and a large area can be secured without changing the rotor thickness, so the permanent magnet holding strength against the rotor plate Becomes higher. In addition, a plurality of permanent magnets are arranged in the circumferential direction with respect to the rotor plate. However, in the boundary area between the permanent magnet portion and the rotor plate portion, the magnetic attractive force is positioned in the circumferential direction by the inclined mounting surface of the permanent magnet. It exhibits a characteristic that changes smoothly with respect to the change, and the generation of cogging torque is suppressed. As a result, the holding strength of the permanent magnet can be increased and the cogging torque can be reduced without increasing the rotor thickness or increasing the number of parts.

  Hereinafter, the best mode for carrying out the rotor structure of an axial gap type rotating electrical machine of the present invention will be described based on Examples 1 to 4 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall cross-sectional view showing a 1 rotor / 2 stator type axial gap rotating electrical machine to which the rotor structure of the first embodiment is applied, and FIG. 2 shows an axial gap rotating electrical machine to which the rotor structure of the first embodiment is applied. It is a front view which shows a stator.
The axial gap type rotating electrical machine according to the first embodiment includes a rotor shaft 1, a rotor 2, a pair of stators 3 and 3, and a rotating electrical machine case 4, and the rotor 2 and the pair of stators 3 and 3. Are arranged opposite to each other in the axial direction.

  The rotor shaft 1 is provided between a first bearing 5 provided between the rotating electrical machine case 4 (front side case 4a) and a second electrical machine case 4 (rear side case 4b). The bearing 6 is rotatably supported. The rotor shaft 1 communicates with an axial oil passage 7, a first radial oil passage 8 that communicates with the axial oil passage 7 and cools the front stator 3, and the axial oil passage 7. A second radial oil passage 9 that cools the rear stator 3 and the second bearing 6, and a third radial oil passage 10 that communicates with the axial oil passage 7 and cools the first bearing 5. Is formed.

  The rotor 2 is fixed to the rotor shaft 1, and the fixed position is a position sandwiched between the pair of stators 3 and 3. The rotor 2 has a rotor plate 11 made of a ferromagnetic material fixed to the rotor shaft 1, and a plurality of permanent magnets 12 and 12 embedded in the circumferential direction at positions facing the pair of stators 3 and 3. Configured. The plurality of permanent magnets 12 and 12 are adjacent to each other so that a reaction force is generated in the permanent magnets 12 and 12 with respect to the rotating magnetic flux applied from the pair of stators 3 and 3 and the rotor shaft 1 is rotated. The surface magnetic poles (N pole, S pole) are arranged so as to be different from each other. Here, an axial gap called an air gap exists between the rotor 2 and the stators 3 and 3 and does not contact each other.

  The stators 3 and 3 are fixed to a front side case 4 a and a rear side case 4 b of the rotating electrical machine case 4, respectively. The stator 3 includes a stator case 13 that is bolted to the side cases 4a and 4b, a stator core 14 made of a laminated steel plate, and a stator coil 16 that is wound around the stator core 14 via an insulator 15. Configured. As shown in FIG. 2, twelve stator cores 14 with stator coils 16 are arranged at equal intervals in the circumferential direction. In addition to the above components, the stator 3 is connected to a core base 17 provided at the base of the stator core 14, a bus bar laminated body 18 that is a feeding structure to the stator coil 16, and the bus bar laminated body 18. A power transmission terminal 19, a refrigerant gallery 20 formed in the stator case 13, a stator core 14 with the stator coil 16, and a resin mold portion 21 that fills the space of the bus bar laminate 18. In the motor mode, the power transmission terminal 19 converts a direct current from the battery into a three-phase alternating current through a high-voltage unit (not shown) having an inverter, and this three-phase alternating current is converted into a stator via the bus bar laminate 18. Power is supplied to the coil 16. In the generator mode, the three-phase alternating current generated by the stator coil 16 is supplied to a high-power unit (not shown) having an inverter, converted into direct-current by the high-power unit, and charged to the battery.

  The rotating electrical machine case 4 includes a front side case 4a, a rear side case 4b, and an outer case 4c that is bolted to both side cases 4a and 4b. As shown in FIG. 1, the front side case 4 a and the rear side case 4 b include a refrigerant supply port 22 that supplies a refrigerant (for example, cooling oil) to the refrigerant gallery 20, and a refrigerant gallery 20. A refrigerant discharge port 23 for discharging the refrigerant that has taken heat from the stator 3 is formed.

3 is a perspective view showing the rotor structure of the axial gap type rotating electrical machine of the first embodiment, and FIG. 4 is a view in the direction of arrow A in FIG. 3 showing the rotor structure of the axial gap type rotating electrical machine of the first embodiment. Hereinafter, the rotor structure of Example 1 will be described.
A plurality of permanent magnets 12, 12 arranged on the rotor 2 are mounted on the rotor plate 11 while alternately changing the polarities (N pole and S pole) in the circumferential direction, and the permanent magnets 12, 12 As shown in FIG. 4, the mounting surfaces for the rotor plate 11 are inclined mounting surfaces 12a and 12a having an inclination angle θ1 with respect to the rotor axial direction.

  As shown in FIG. 3, the rotor plate 11 is cut off from the outer peripheral side toward the inner peripheral side, thereby being surrounded by a pair of inclined fitting surfaces 32a and 32a and a radial stopper surface 32b. A plurality of magnet mounting grooves 32 are formed in the circumferential direction.

  The permanent magnet 12 is mounted on the pair of inclined fitting surfaces 32a and 12a and the radial stopper surface 32b by fitting into the magnet mounting groove 32. An inner diameter mounting surface 12b, and a magnetic pole surface 12c that is the same as the stator facing surfaces 11a, 11a of the rotor plate 11.

  The rotor 2 is sandwiched between a pair of stators 3 and 3 so as to be opposed to each other in the axial direction, and a rotor center plane perpendicular to the rotor shaft 1 is a coupling surface C of the magnet mounting groove 32 of the rotor plate 11. A pair of permanent magnets 12 and 12 having different polarities are fitted.

Next, the operation will be described.
In the conventional axial gap type motor, the permanent magnet is mounted on the surface of the rotor plate, or is inserted by fitting in the axial direction, so that the rotor plate mounting surface of the permanent magnet matches the rotor axial direction, Since the permanent magnet mounting area is limited and narrowed by the rotor thickness, the retention strength of the permanent magnet to the rotor plate is low, and peeling may occur at the magnet mounting part or the permanent magnet may be pulled out in the axial direction. There is sex.
In addition, a plurality of permanent magnets are disposed in the circumferential direction with respect to the rotor plate. However, since the permanent magnet portion and the rotor plate portion are completely separated in the circumferential direction, the boundary between the permanent magnet portion and the rotor plate portion is present. In this case, a large difference in magnetic attractive force occurs. For this reason, generation | occurrence | production of the cogging torque resulting from the difference of the static magnetic attraction force of the stator and rotor by a rotor position will become large.
And these problems are a big subject with respect to high-speed rotation and high torque, when it is going to employ | adopt an axial gap type motor as power sources, such as a hybrid vehicle and an electric vehicle, for example.

  On the other hand, in the rotor structure of the axial gap type rotating electric machine according to the first embodiment, a plurality of permanent magnets 12 and 12 arranged on the rotor 2 are mounted on the rotor plate 11 while alternately changing the polarities in the circumferential direction. The mounting surfaces of the permanent magnets 12 and 12 with respect to the rotor plate 11 are inclined mounting surfaces 12a and 12a having an inclination angle θ1 with respect to the rotor axial direction.

  Accordingly, the rotor plate mounting surface of the permanent magnets 12 and 12 does not coincide with the rotor axial direction (magnet removal direction), and the mounting area of the permanent magnets 12 and 12 can be secured without changing the rotor thickness. The holding strength of the permanent magnets 12 and 12 with respect to 11 is increased. For example, when the inclination angle θ1 is 45 °, the mounting area is doubled with the same rotor thickness.

  In addition, a plurality of permanent magnets 12 and 12 are arranged in the circumferential direction with respect to the rotor plate 11, but in the boundary region between the permanent magnet portion and the rotor plate portion, the inclined mounting surfaces 12 a and 12 a of the permanent magnet 12 are used. The magnetic attractive force (magnetic flux) changes smoothly with respect to the circumferential position change, such as moving to the rotor plate part while reducing the magnet thickness in the rotor axial direction, and the generation of cogging torque is kept low. It is done.

  Furthermore, in the rotor structure of the first embodiment, the rotor plate 11 is cut in three directions by a pair of inclined fitting surfaces 32a and 32a and a radial stopper surface 32b by cutting away from the outer peripheral side to the inner peripheral side. Since the plurality of magnet mounting grooves 32 surrounded by a plurality of grooves are formed in the circumferential direction, the machining of the magnet mounting grooves 32 can be easily performed from the outer peripheral side of the rotor plate 11.

  In the rotor structure of the first embodiment, the permanent magnet 12 includes a pair of inclined mounting surfaces 12a and 12a mounted on the pair of inclined mounting surfaces 32a and 32a and a radial stopper surface. Since it has the inner diameter mounting surface 12b to be mounted on 32b and the magnetic pole surface 12c that is the same as the stator facing surfaces 11a, 11a of the rotor plate 11, no irregularities are formed on the surface of the rotor plate 11, The rotor 2 which integrates the permanent magnets 12 and 12 can be configured.

  In the rotor structure of the first embodiment, the rotor 2 is sandwiched between the pair of stators 3 and 3 so as to be opposed to each other in the axial direction, and the rotor mounting surface 32 of the rotor plate 11 has a rotor center plane perpendicular to the rotor shaft 1. Since the pair of permanent magnets 12 and 12 having different polarities as the coupling surfaces C are fitted to each other, the pair of permanent magnets 12 and 12 are formed in the same magnet mounting groove 32 penetrating the stator facing surfaces 11a and 11a in the axial direction. The magnet areas on both sides in the axial direction can be easily equalized only by fitting 12.

Next, the effect will be described.
In the rotor structure of the axial gap type rotating electrical machine of the first embodiment, the effects listed below can be obtained.

  (1) Axial in which the rotor 2 having the permanent magnets 12 and 12 disposed thereon and the stators 3 and 3 having the stator core 14 and the stator coil 16 are disposed, and the rotor 2 and the stators 3 and 3 are disposed in the axial direction. In the gap-type rotating electrical machine, a plurality of permanent magnets 12 and 12 arranged on the rotor 2 are mounted on the rotor plate 11 with the polarities being alternately changed in the circumferential direction, and the permanent magnets 12 and 12 Since the mounting surfaces for the rotor plate 11 are inclined mounting surfaces 12a and 12a having an inclination angle θ1 with respect to the rotor axial direction, the permanent magnets 12 and 12 can be formed without increasing the rotor thickness or the number of parts. The holding strength can be increased and the cogging torque can be reduced.

  (2) The rotor plate 11 is cut from the outer peripheral side toward the inner peripheral side, so that a magnet mounting groove surrounded on three sides by the pair of inclined fitting surfaces 32a and 32a and the radial stopper surface 32b. 32 are formed in a circumferential direction, and the permanent magnet 12 includes a pair of inclined mounting surfaces 12a and 12a attached to the pair of inclined fitting surfaces 32a and 32a by fitting into the magnet mounting groove 32; Since the inner diameter mounting surface 12b mounted on the radial stopper surface 32b and the magnetic pole surface 12c that is the same as the stator facing surfaces 11a and 11a of the rotor plate 11 are provided, the groove mounting of the magnet mounting groove 32 is performed. It is easy, and the rotor 2 without the surface unevenness | corrugation which integrates the permanent magnets 12 and 12 can be comprised.

  (3) The rotor 2 is sandwiched between a pair of stators 3 and 3 so as to face each other in the axial direction, and the rotor center plane perpendicular to the rotor shaft 1 is connected to the magnet mounting groove 32 of the rotor plate 11. Since the pair of permanent magnets 12 and 12 having different polarities C are fitted, the magnet areas on both axial sides can be easily equalized only by fitting the pair of permanent magnets 12 and 12 to the same magnet mounting groove 32. it can.

  Example 2 is an example in which the inclination angle with respect to the rotor axis direction is set to be larger than the inclination angle with respect to the rotor axis orthogonal direction, and permanent magnets having different magnetism are alternately arranged in the circumferential direction with the magnetic pole surface as the inclined mounting surface. It is.

  FIG. 5 is a perspective view showing the rotor structure of the axial gap type rotating electrical machine of the second embodiment, and FIG. 6 is a view in the direction of arrow A in FIG. 5 showing the rotor structure of the axial gap type rotating electrical machine of the second embodiment. Hereinafter, the rotor structure of Example 2 will be described.

  The inclined mounting surfaces 12a and 12a of the permanent magnets 12 and 12 are set such that the inclination angle θ1 with respect to the rotor axis direction is larger than the inclination angle θ2 with respect to the rotor axis orthogonal direction.

  The rotor 2 is sandwiched between a pair of stators 3 and 3 and opposed to each other in the axial direction. As shown in FIG. 6, the rotor 2 has a magnet mounting groove 32 from the pair of inclined mounting surfaces 12 a and 12 a. A pair of permanent magnets 12 and 12 having different polarities with the parallel center plane D having the same distance as each other's coupling surface are fitted. That is, the magnetic pole surfaces of the permanent magnets 12 and 12 are inclined mounting surfaces 12a and 12a.

  Then, a set of permanent magnets 12 and 12 having the same polarity sandwiching the inter-groove portion 11b of the rotor plate 11 is used as a magnet unit, and the magnet units are alternately arranged in the circumferential direction while being alternately changed in polarity. Yes. For example, in the case of FIG. 6, a magnet unit is composed of a pair of permanent magnets 12 and 12 with N poles sandwiching the inter-groove portion 11b, and the N pole magnet unit and the S pole magnet unit overlap in the circumferential direction. While being held, they are alternately arranged with the parallel central plane D as a boundary. Since other configurations are the same as those of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation will be described. In the rotor structure of the second embodiment, the inclined mounting surfaces 12a and 12a of the permanent magnets 12 and 12 have an inclination angle θ1 with respect to the rotor axis direction larger than the inclination angle θ2 with respect to the rotor axis orthogonal direction. The angle is set. By setting the inclination angle relationship θ1> θ2, the interfacial frictional force between the permanent magnet 12 and the rotor plate 11 generated by the electromagnetic force in the axial direction acting on the permanent magnet 12 is increased, and the permanent magnet 12 is further compared to the first embodiment. , 12 can be increased.

The rotor 2 is sandwiched between a pair of stators 3 and 3 so as to be opposed to each other in the axial direction, and a parallel center plane D having the same distance from the pair of inclined mounting surfaces 12a and 12a is formed in the magnet mounting groove 32 of the rotor plate 11. A pair of permanent magnets 12 and 12 having different polarities as coupling surfaces are fitted into each other, and a pair of permanent magnets 12 and 12 having the same polarity sandwiching the inter-groove portion 11b of the rotor plate 11 is used as a magnet unit. The magnet units are continuously arranged in the circumferential direction while alternately changing the polarities of the magnet units. As a result, the leakage magnetic flux path between the circumferentially adjacent permanent magnets 12 and 12 (for example, as shown in FIG. 6, the magnetic flux leakage from the N pole inter-groove portion 11b to the adjacent S pole inter-groove portion 11b. By providing an air layer having a high magnetic resistance in the path), the leakage magnetic flux is reduced and the torque is increased as compared with the first embodiment.
Further, since the forces (arrows in FIG. 6) acting on the pair of permanent magnets 12 and 12 act on the rotor plate 11 in different directions, the two forces are canceled each other. For this reason, deformation and vibration of the rotor plate 11 can be reduced. Since other operations are the same as those of the first embodiment, description thereof is omitted.

  Next, the effect will be described. In the rotor structure of the axial gap type rotating electrical machine of the second embodiment, the following effect can be obtained in addition to the effect (1) of the first embodiment.

  (4) Since the inclined mounting surfaces 12a and 12a of the permanent magnets 12 and 12 are set such that the inclination angle θ1 with respect to the rotor axis direction is larger than the inclination angle θ2 with respect to the rotor axis orthogonal direction, compared to the first embodiment, The holding strength of the permanent magnets 12 and 12 can be increased.

  (5) The rotor 2 is disposed between the pair of stators 3 and 3 so as to face each other in the axial direction, and is parallel to the magnet mounting groove 32 of the rotor plate 11 with the same distance from the pair of inclined mounting surfaces 12a and 12a. A pair of permanent magnets 12, 12 having different polarities with the center plane D as a coupling surface are fitted, and a pair of permanent magnets 12, 12 with the same polarity sandwiching the inter-groove portion 11 b of the rotor plate 11. Since the magnet units are arranged continuously in the circumferential direction while alternately changing the polarities of the magnet units, the torque can be increased by reducing the leakage magnetic flux, and the deformation and vibration of the rotor plate 11 can be reduced.

  The third embodiment is an example in which the pair of permanent magnets in the second embodiment is rectangular when viewed from the radial direction.

FIG. 7 is a perspective view showing the rotor structure of the axial gap type rotating electrical machine of the third embodiment, and FIG. 8 is a view in the direction of arrow A in FIG. 7 showing the rotor structure of the axial gap type rotating electrical machine of the third embodiment. Hereinafter, the rotor structure of Example 3 will be described.
The pair of permanent magnets 12, 12 mounted in the magnet mounting groove 32 of the third embodiment has a rectangular shape as viewed from the radial direction, and has a short side substantially matching the groove width of the magnet mounting groove 32, The rotor plate 11 has long sides that do not protrude from the pair of stator facing surfaces 11a, 11a formed on both sides of the rotor plate 11. Since other configurations are the same as those of the second embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation will be described. Since the pair of permanent magnets 12, 12 mounted in the magnet mounting groove 32 of the third embodiment has a rectangular shape as viewed from the radial direction, the permanent magnet 12, The portion of the triangular prism which is disadvantageous in terms of strength is eliminated, and the strength of the permanent magnets 12 and 12 is ensured. In addition, when the permanent magnets 12 and 12 are manufactured, if they have an inclined surface as in the second embodiment, a complicatedly shaped die is required, and it takes time to fill the material, resulting in an increase in cost. In contrast, the rectangular shape can reduce the cost. Other operations are the same as those in the second embodiment.

  Next, the effect will be described. In the rotor structure of the axial gap type rotating electric machine of the third embodiment, the following effects can be obtained in addition to the effects of the second embodiment.

  (6) The pair of permanent magnets 12, 12 mounted in the magnet mounting groove 32 has a rectangular shape when viewed from the radial direction, and has a short side substantially matching the groove width of the magnet mounting groove 32, Since it has the long side which does not protrude from a pair of stator opposing surface 11a, 11a formed in the both sides of the rotor plate 11, the intensity | strength of the permanent magnets 12 and 12 can be ensured and cost reduction can also be achieved.

  The fourth embodiment is an example in which the permanent magnet is mounted in the magnet mounting groove while the permanent magnet is mounted in the magnet mounting hole in the third embodiment.

  FIG. 9 is a perspective view showing a rotor structure of an axial gap type rotating electric machine according to the fourth embodiment, and FIG. 10 is a sectional view taken along line BB of FIG. 9 showing a rotor structure of the axial gap type rotating electric machine according to the fourth embodiment. Hereinafter, the rotor structure of Example 4 will be described.

  The rotor plate 11 has a pair of inclined fitting surfaces 33a and 33a and a pair of radial stopper surfaces 33b and 33b by cutting through a pair of stator facing surfaces 11a and 11a formed on both sides. A plurality of magnet mounting holes 33 surrounded by four directions are formed in the circumferential direction, and the permanent magnets 12 and 12 are mounted on the pair of inclined fitting surfaces 33a and 33a by fitting into the magnet mounting holes 33. A pair of inclined mounting surfaces 12a, 12a, and a pair of inner and outer diameter mounting surfaces 12d, 12e mounted on the pair of radial stopper surfaces 33b, 33b. Since other configurations are the same as those of the third embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation will be described. In the rotor structure of the fourth embodiment, the centrifugal force acting on the permanent magnet 12 is supported by the stator plate 11 itself, and the holding strength of the permanent magnet 12 on the stator plate 11 in the high rotation range is increased. be able to. In this case, the stator plate 11 can be manufactured by cutting from a solid material, laminating thin electromagnetic steel plates with the phase shifted in the circumferential direction, or by using a sintered material or the like. . Since other operations are the same as those of the third embodiment, description thereof is omitted.

  Next, the effects will be described. In the rotor structure of the axial gap type rotating electric machine of the fourth embodiment, the following effects can be obtained in addition to the effects of the third embodiment.

  (7) The rotor plate 11 has a pair of inclined fitting surfaces 33a and 33a and a pair of radial stopper surfaces 33b by cutting through a pair of stator facing surfaces 11a and 11a formed on both sides. A plurality of magnet mounting holes 33 surrounded by four directions are formed in the circumferential direction, and the permanent magnets 12 and 12 are fitted into the magnet mounting holes 33 so that the pair of inclined fitting surfaces 33a, Since it has a pair of inclined mounting surfaces 12a and 12a to be mounted on 33a and a pair of inner and outer diameter mounting surfaces 12d and 12e to be mounted on the pair of radial stopper surfaces 33b and 33b, it is permanent in a high rotation range. The holding strength of the magnet 12 with respect to the stator plate 11 can be increased.

  As described above, the rotor structure of the axial gap type rotating electrical machine of the present invention has been described based on the first to fourth embodiments. However, the specific configuration is not limited to these embodiments, and the claims are not limited thereto. Modifications and additions of the design are permitted without departing from the spirit of the invention according to the claims.

  For example, in Examples 1 to 4, an example in which a stator is provided on both sides of one rotor has been shown. However, in the case of having a stator on only one side, in addition to this shape, a permanent magnet and a rotor plate are wrapped in the axial direction. If it has a shape having an inclined mounting surface, the same effect can be obtained.

  In the fourth embodiment, the magnet mounting hole is used instead of the magnet mounting groove in the third embodiment. However, in the first embodiment, the magnet mounting hole may be used instead of the magnet mounting groove. In the second embodiment, the magnet mounting groove may be used. It is good also as a magnet mounting hole instead.

  In Examples 1 to 4, as an axial gap type rotating electrical machine, an example in which an axial air gap is provided between the rotor and the stator has been shown. However, for example, an axial gap by an oil film is provided between the rotor and the stator. The present invention can also be applied to an axial gap type rotating electrical machine in which there is substantially no air gap.

  In the first to fourth embodiments, an axial gap type rotating electric machine is described. However, it may be applied as an axial gap type motor, or may be applied as an axial gap type generator. In the first to fourth embodiments, an example of application to a 1 rotor / 2 stator type axial gap type rotating electrical machine has been shown. However, a 1 rotor / 1 stator type, 2 rotor / 1 stator type, 2 rotor / 2 stator type The present invention can also be applied to an axial gap type rotating electrical machine in which the number of stators and rotors is different from that of the embodiment.

It is a whole sectional view showing an axial gap type rotating electrical machine to which the rotor structure of Example 1 is applied. It is a figure which shows the stator to which the rotor structure of the axial gap type rotary electric machine of Example 1 was applied. 1 is a perspective view showing a rotor structure of an axial gap type rotating electric machine according to Embodiment 1. FIG. FIG. 4 is a view in the direction of arrow A in FIG. 3 illustrating the rotor structure of the axial gap type rotating electric machine according to the first embodiment. 6 is a perspective view showing a rotor structure of an axial gap type rotating electric machine according to Embodiment 2. FIG. FIG. 6 is a view in the direction of arrow A in FIG. 5 illustrating the rotor structure of the axial gap type rotating electric machine according to the second embodiment. FIG. 6 is a perspective view showing a rotor structure of an axial gap type rotating electric machine according to a third embodiment. FIG. 8 is a view in the direction of arrow A in FIG. 7 showing the rotor structure of the axial gap type rotating electrical machine of the third embodiment. FIG. 6 is a perspective view showing a rotor structure of an axial gap type rotating electric machine according to a fourth embodiment. FIG. 10 is a cross-sectional view taken along line B-B in FIG. 9 illustrating the rotor structure of the axial gap type rotating electric machine according to the fourth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor shaft 2 Rotor 3 Stator 4 Rotating electrical machine case 5 1st bearing 6 2nd bearing 7 Axial center oil path 8 1st radial direction oil path 9 2nd radial direction oil path 10 3rd radial direction oil path 11 Rotor plate 11a Stator Opposing surface 12 Permanent magnet 12a Inclined mounting surface 12b Inner diameter mounting surface 12c Magnetic pole surfaces 12d and 12e Inner and outer diameter mounting surfaces 13 Stator case 14 Stator core 15 Insulator 16 Stator coil 17 Core base 18 Bus bar laminated body 19 Power transmission terminals θ1, θ2 Inclination angle 32 Magnet mounting groove 32a Inclined fitting surface 32b Radial stopper surface 33 Magnet mounting hole 33a Inclined fitting surface 33b Radial stopper surface

Claims (7)

In an axial gap type rotating electrical machine including a rotor having a permanent magnet, a stator having a stator core and a stator coil, and the rotor and the stator are disposed in an axial direction.
A plurality of permanent magnets arranged on the rotor are mounted on the rotor plate while alternately changing the polarity in the circumferential direction, and the mounting surface of the permanent magnet with respect to the rotor plate is inclined with respect to the rotor axial direction. A rotor structure for an axial gap type rotating electrical machine, characterized in that the mounting surface has an inclined mounting surface. In the rotor structure of the axial gap type rotating electrical machine according to claim 1,
The rotor plate is cut from the outer peripheral side toward the inner peripheral side, so that a plurality of magnet mounting grooves surrounded by three sides by a pair of inclined fitting surfaces and a radial stopper surface are formed in the circumferential direction. ,
The permanent magnet includes a pair of inclined mounting surfaces that are mounted on the pair of inclined fitting surfaces, an inner diameter mounting surface that is mounted on the radial stopper surface, and the rotor plate. A rotor structure for an axial gap type rotating electrical machine, comprising: a magnetic pole surface that is flush with the stator facing surface. In the rotor structure of the axial gap type rotating electrical machine according to claim 2,
The rotor is disposed between the pair of stators so as to face each other in the axial direction,
A rotor structure of an axial gap type rotating electrical machine, wherein a pair of permanent magnets having different polarities having a rotor center plane perpendicular to the rotor axis as a coupling surface are fitted in the magnet mounting groove of the rotor plate. In the rotor structure of the axial gap type rotating electrical machine according to claim 2 or 3,
The rotor structure of the axial gap type rotating electrical machine, wherein the inclined mounting surface of the permanent magnet has an inclination angle with respect to the rotor axis direction larger than an inclination angle with respect to the rotor axis orthogonal direction. In the rotor structure of the axial gap type rotating electrical machine according to claim 4,
The rotor is disposed between the pair of stators so as to face each other in the axial direction,
A pair of permanent magnets having different polarities, each having a parallel center plane with the same distance from the pair of inclined mounting surfaces as the coupling surfaces, are fitted in the magnet mounting grooves of the rotor plate, and the groove portion of the rotor plate A rotor structure of an axial gap type rotating electrical machine, wherein a pair of permanent magnets having the same polarity sandwiching the magnet is used as a magnet unit, and the magnet units are continuously arranged in the circumferential direction with different polarities. In the rotor structure of the axial gap type rotating electrical machine according to claim 4 or 5,
The pair of permanent magnets mounted in the magnet mounting groove has a rectangular shape when viewed from the radial direction, and is formed on both sides of the rotor plate and a short side substantially matching the groove width of the magnet mounting groove. A rotor structure of an axial gap type rotating electrical machine having a long side that does not protrude from a pair of stator facing surfaces. In the rotor structure of the axial gap type rotating electrical machine according to claim 1,
The rotor plate has a magnet mounting hole surrounded in four directions by a pair of inclined fitting surfaces and a pair of radial stopper surfaces by cutting through a pair of stator facing surfaces formed on both sides. Form multiple in the circumferential direction,
The permanent magnet has a pair of inclined mounting surfaces mounted on the pair of inclined fitting surfaces and a pair of inner and outer diameter mounting surfaces mounted on the pair of radial stopper surfaces by fitting into the magnet mounting holes. And a rotor structure for an axial gap type rotating electrical machine.

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