JP2019161698A - Rotor assembly of rotary electric machine, and rotary electric machine thereof - Google Patents

Abstract

An object of the present invention is to provide a rotor assembly of a rotating electrical machine having a simple configuration and capable of obtaining an excellent torque ripple reduction effect. A rotor assembly (16) of a rotating electric machine (11) according to the present invention includes first and second rotor units (17, 19) having magnetic pole portions (33) sharing a field magnet (31) coaxially parallel and coaxial. It is composed of a plurality of combinations. A first groove 37 extending in the axial direction is provided on the outer peripheral surface 35 of the first rotor unit 17. A second groove 39 extending in the axial direction is provided on the outer peripheral surface 35 of the second rotor unit 19 so as to be shifted to a position that does not overlap the first groove 37 in the circumferential direction. The first magnetic pole center 40 of the magnetic pole portion 33 provided in the first rotor unit 17 and the second magnetic pole center 42 of the magnetic pole portion 33 provided in the second rotor unit 19 are positioned d-axis symmetrically. [Selection diagram] FIG.

Description

  The present invention relates to a rotor assembly for a rotating electrical machine capable of reducing torque ripple and the rotating electrical machine.

  In recent years, as an approach for realizing a low-carbon society, vehicles equipped with rotating electrical machines have become widespread in addition to or instead of the internal combustion engine that is a driving source of the vehicle. Such vehicles are hybrid vehicles (Hybrid Electric Vehicles) and electric vehicles (Electric Vehicles).

  The rotating electrical machine includes an annular stator and a cylindrical rotor. The stator is configured by providing a stator coil in each of a plurality of slots provided in the stator core. The rotor is rotatably provided with a slight gap with respect to the inner peripheral surface of the stator. A plurality of permanent magnets are arranged at equal intervals in the circumferential direction on the rotor core provided in the rotor.

  In a rotating electrical machine, it is required to reduce torque ripple (torque pulsation) in order to reduce noise and vibration generated during its operation.

Patent Document 1 describes an invention of a rotating electrical machine that can reduce torque ripple.
A rotating electrical machine according to Patent Document 1 includes a stator having a stator winding, and a rotor that is rotatably arranged with respect to the stator and is provided with a plurality of magnets. In the magnetic auxiliary salient pole portion provided in the rotor and formed between the poles of the magnet, a magnetic gap (magnetoresistance changing portion) is formed along the axial direction at a position shifted in the circumferential direction from the q axis passing through the salient pole center. ) To reduce cogging torque and torque pulsation during energization.
According to the rotating electrical machine according to Patent Document 1, torque ripple can be reduced.

JP 2013-176292 A

  However, in the rotating electrical machine according to Patent Document 1, the amount of deviation from the q-axis of the magnetoresistive change portion is appropriately determined according to the position of the magnetic auxiliary salient pole in consideration that the torque pulsations during energization cancel each other. It needs to be different. For this reason, there is a problem to be solved in that the man-hours for setting the amount of deviation from the q-axis of the magnetoresistive change portion according to the position of the magnetic auxiliary salient pole cannot withstand.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotor assembly of a rotating electrical machine and a rotating electrical machine that have a simple configuration and can obtain an excellent torque ripple reduction effect.

  In order to achieve the above object, an invention according to claim 1 is a rotating electrical machine configured by combining a plurality of rotor units each having a magnetic pole portion having a field magnet extending in the axial direction in parallel and coaxially in the axial direction. In the rotor assembly, the plurality of rotor units include at least first and second rotor units, and the magnetic pole portions provided in the first and second rotor units share the field magnet. A first groove portion extending in the axial direction is provided on the outer peripheral surface of the first rotor unit, and a second groove portion extending in the axial direction is provided on the outer peripheral surface of the second rotor unit in the circumferential direction with respect to the first groove portion. The first magnetic pole center of the magnetic pole part provided in the first rotor unit and the second magnetic pole center of the magnetic pole part provided in the second rotor unit are provided in a shifted position so as not to overlap with each other, and are symmetrical with respect to the d axis. It is location, and the most important feature it.

  In the invention according to claim 1, the first groove portion extending in the axial direction is provided on the outer peripheral surface of the first rotor unit. On the other hand, on the outer peripheral surface of the second rotor unit, the second groove portion extending in the axial direction is provided at a position where it does not overlap with the first groove portion in the circumferential direction. The first magnetic pole center of the magnetic pole part provided in the first rotor unit and the second magnetic pole center of the magnetic pole part provided in the second rotor unit are positioned symmetrically with respect to the d axis.

  According to the first aspect of the present invention, the torque waveform related to the first rotor unit and the torque waveform related to the second rotor unit when the motor current is passed through the stator coil of the stator are in an opposite phase relationship to each other. Therefore, the torque fluctuation range is suppressed in the torque waveform obtained by combining these. As a result, an excellent torque ripple reduction effect can be obtained with a simple configuration.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor assembly of the rotary electric machine which can obtain the outstanding torque ripple reduction effect with a simple structure can be provided.

It is a rotary electric machine which concerns on this invention, Comprising: It is a front view of the rotary electric machine provided with the 1st rotor unit. It is a figure which expands and represents the periphery of the magnetic pole part provided in the 1st rotor unit with which the rotary electric machine shown to FIG. 1A is equipped. It is a rotary electric machine which concerns on this invention, Comprising: It is a front view of the rotary electric machine provided with a 2nd rotor unit. It is a figure which expands and represents the periphery of the magnetic pole part provided in the 2nd rotor unit with which the rotary electric machine shown to FIG. 2A is equipped. 1 is a perspective view of a rotor assembly of a rotating electrical machine according to the present invention, which is configured by combining first and second rotor units. It is explanatory drawing showing the torque ripple reduction effect of the rotary electric machine which concerns on this invention. It is a schematic block diagram of the 1st rotary electric machine which concerns on 1st Embodiment of this invention. It is a schematic block diagram of the 2nd rotary electric machine which concerns on 2nd Embodiment of this invention. It is a schematic block diagram of the 3rd rotary electric machine which concerns on 3rd Embodiment of this invention. It is a schematic block diagram of the 4th rotary electric machine which concerns on 4th Embodiment of this invention. It is a schematic block diagram of the 5th rotary electric machine which concerns on 5th Embodiment of this invention. It is a schematic block diagram of the 6th rotary electric machine which concerns on 6th Embodiment of this invention. It is a schematic block diagram of the 7th rotary electric machine which concerns on 7th Embodiment of this invention. It is a schematic block diagram of the 8th rotary electric machine which concerns on 8th Embodiment of this invention. It is a rotary electric machine which concerns on this invention, Comprising: It is a front view of the rotary electric machine provided with a 3rd rotor unit. It is a figure which expands and represents the periphery of the magnetic pole part provided in the 3rd rotor unit with which the rotary electric machine shown to FIG. 6A is equipped.

Hereinafter, a rotor assembly of a rotating electrical machine and a plurality of embodiments of the rotating electrical machine according to the present invention will be described in detail with reference to appropriate drawings.
In addition, in drawing shown below, the same referential mark is attached | subjected between the same members or corresponding members. In addition, the size and shape of the member may be schematically represented by being modified or exaggerated for convenience of explanation.

[Basic configuration of rotating electrical machine 11 according to the present invention]
First, the basic configuration of the rotating electrical machine 11 according to the present invention will be described in detail with reference to FIGS. 1A, 1B, 2A, 2B, and 3. FIG.
FIG. 1A is a front view of a rotating electrical machine 11 according to the present invention, which is provided with a first rotor unit 17. FIG. 1B is an enlarged view of the periphery of the magnetic pole portion 33 provided in the first rotor unit 17 provided in the rotating electrical machine 11 shown in FIG. 1A. FIG. 2A is a front view of the rotating electrical machine 11 according to the present invention, which is provided with the second rotor unit 19. FIG. 2B is an enlarged view showing the periphery of the magnetic pole portion 33 provided in the second rotor unit 19 provided in the rotating electrical machine 11 shown in FIG. 2A. FIG. 3 is a perspective view of the rotor assembly 16 of the rotating electrical machine 11 according to the present invention, which is configured by combining the first and second rotor units 17 and 19.

  As shown in FIGS. 1A, 2A, and 3, the rotary electric machine 11 according to the present invention includes an annular stator 13 and a rotor assembly 16 (see FIG. 3).

  As shown in FIGS. 1A, 1B, 2A, and 2B, the stator 13 includes a stator core 21, a plurality of slots 22 provided in the stator core 21, and a stator coil 23 provided in each of the plurality of slots 22. It is configured.

  The stator core 21 is formed in a cylindrical shape as a whole, as shown in FIGS. 1A and 2A. The stator core 21 is configured by, for example, laminating a plurality of electromagnetic steel plates formed in an annular shape in the axial direction.

As shown in FIG. 3, the rotor assembly 16 according to the present invention includes first and second rotor units 17 and 19 provided on a rotating shaft 15 (see FIGS. 1A and 2A) of an axis 20 in the axial direction. Are combined in parallel and coaxially. Each of the first and second rotor units 17 and 19 includes a magnetic pole portion 33 having a pair of field magnets 31 (see FIGS. 1B and 2B) extending straight in the axial direction. The magnetic pole portions 33 provided in the first and second rotor units 17 and 19 share the field magnet 31. In the example of FIG. 1B, the set of field magnets 31 includes, for example, three field magnets 31a, 31b, and 31c.
Hereinafter, when the field magnets 31a, 31b, and 31c are collectively referred to, they may be simply referred to as “field magnets (permanent magnets) 31”.

  Although it does not specifically limit as the permanent magnet 31, For example, rare earth magnets, such as a neodymium magnet which has a high magnetic characteristic, can be used suitably aiming at high torque density. As shown in FIG. 3, the length of the permanent magnet 31 is set to a length equivalent to the total axial length of the rotor assembly 16.

  As shown in FIGS. 1A and 1B, the first rotor unit 17 constituting a part of the rotor assembly 16 is rotatably provided in a hollow portion existing on the inner diameter side of the stator 13 through a slight gap. As shown in FIGS. 1A and 3, the first rotor unit 17 is formed in a cylindrical shape as a whole. The first rotor unit 17 may be configured by, for example, laminating a plurality of electromagnetic steel plates formed in an annular shape in the axial direction.

As shown in FIG. 1B, a plurality of sets of magnet slots 29 penetrating in the axial direction (see FIG. 1A) are provided in the first rotor unit 17 at equal intervals in the circumferential direction (see FIG. 1A). . In the example of FIG. 1B, the set of magnet slots 29 includes, for example, three magnet slots 29a, 29b, and 29c. Rectangular magnetic field magnets (permanent magnets) 31a, 31b, and 31c are inserted and fixed in the magnet slots 29a, 29b, and 29c, respectively. The cross section of the pair of magnet slots 29 is formed, for example, in a substantially V shape that opens outward in the radial direction of the first rotor unit 17 (see FIGS. 1A and 1B).
Hereinafter, when the magnet slots 29a, 29b, and 29c are collectively referred to, they may be simply referred to as “magnet slots 29”.

  In the first rotor unit 17, the magnetic pole portion 33 is configured by embedding the permanent magnet 31 in the magnet slot 29.

  As shown in FIGS. 1A, 1B, and 3, first groove portions 37 extending in the axial direction are provided on the outer circumferential surface (general surface) 35 of the first rotor unit 17 at equal intervals in the circumferential direction. Yes. As shown in FIG. 1B and FIG. 3, the first groove portion 37 includes a bottom wall portion 37 a positioned parallel to the outer peripheral surface 35 and slightly recessed, and first and second side walls facing the circumferential direction. With parts 37b1 and 37b2. The first groove portion 37 is formed in a substantially rectangular shape as a whole when viewed from the axial direction.

As shown in FIG. 1B, the first side wall 37b1 of the first groove portion 37 is located at the location of the outer peripheral surface 35 corresponding to the d-axis 30 that is the standard magnetic pole center of the magnetic pole portion 33.
On the other hand, as shown in FIG. 1B, the second side wall portion 37b2 of the first groove portion 37 is between the d-axis 30 and the q-axis (not shown) and is the outer peripheral surface 35 in the clockwise direction with respect to the d-axis 30. Located in the place.

  Due to the presence of the first groove portion 37, the first magnetic pole center 40 of the magnetic pole portion 33 provided in the first rotor unit 17 is shifted in the counterclockwise direction with respect to the d-axis 30 as shown in FIGS. 1A and 1B. is doing.

  The depth dimension (diameter dimension) of the first groove portion 37 is a result of obtaining the effect of the first groove portion 37 on the torque variation characteristic of the first rotor unit 17 through experiments and simulations, and the target torque variation characteristic. It is only necessary to set appropriate dimensions after comparing the weights.

  The width dimension (circumferential dimension) of the first groove portion 37 is the same as described above, and the result of obtaining the effect of the first groove portion 37 on the torque fluctuation characteristics of the first rotor unit 17 through experiments and simulations, and the target torque. Appropriate dimensions may be set after comparing the fluctuation characteristics.

  Similarly to the above, the shape of the first groove portion 37 is a comparative measure of the results obtained by experiment / simulation of the influence of the first groove portion 37 on the torque fluctuation characteristics of the first rotor unit 17 and the target torque fluctuation characteristics. In addition, an appropriate dimension may be set. Although it does not specifically limit as a shape of the 1st groove part 37, For example, seeing from an axial direction, V shape, a semicircle shape, trapezoid shape, etc. can be illustrated.

  On the other hand, as shown in FIGS. 2A and 2B, the second rotor unit 19 constituting a part of the rotor assembly 16 is rotatably provided in a hollow portion on the inner diameter side of the stator 13 through a slight gap. It is done. As shown in FIGS. 2A and 3, the second rotor unit 19 is formed in a cylindrical shape as a whole. Similarly to the first rotor unit 17, the second rotor unit 19 may be configured by, for example, laminating a plurality of electromagnetic steel plates formed in an annular shape in the axial direction.

  As shown in FIG. 2B, in the second rotor unit 19, as in the first rotor unit 17, a plurality of sets of magnet slots 29 penetrating in the axial direction (see FIG. 2A) are equal to the circumferential direction (see FIG. 2A). It is provided at intervals. A rectangular bar-like permanent magnet 31 is inserted and fixed in the magnet slot 29. The cross section of the pair of magnet slots 29 is formed in, for example, a substantially V shape that opens outward in the radial direction of the second rotor unit 19 (see FIGS. 2A and 2B).

  In the second rotor unit 19, similarly to the first rotor unit 17, the magnetic pole portion 33 is configured by embedding a permanent magnet 31 in the magnet slot 29.

  As shown in FIG. 2A, FIG. 2B, and FIG. 3, the second groove part 39 extending in the axial direction is shifted to a position where it does not overlap the first groove part 37 in the circumferential direction on the outer circumferential surface 35 of the second rotor unit 19, They are provided at equal intervals in the circumferential direction.

  As shown in FIGS. 2B and 3, the second groove portion 39 includes a bottom wall portion 39 a that is parallel to the outer peripheral surface 35 and slightly recessed, and first and second side walls that face the circumferential direction. With portions 39b1 and 39b2. Similarly to the first groove portion 37, the second groove portion 39 is formed in a substantially rectangular shape as a whole when viewed from the axial direction.

As shown in FIG. 2B, the first side wall 39 b 1 of the second groove 39 is located at the location of the outer peripheral surface 35 corresponding to the d-axis 30 that is the standard magnetic pole center of the magnetic pole 33.
On the other hand, as shown in FIG. 2B, the second side wall 39 b 2 of the second groove 39 is between the d-axis 30 and the q-axis (not shown) and is an outer circumferential surface in the counterclockwise direction with respect to the d-axis 30. Located at 35 locations.

  Due to the presence of the second groove portion 39, the second magnetic pole center 42 of the magnetic pole portion 33 provided in the second rotor unit 19 is positioned so as to be shifted in the clockwise direction with respect to the d-axis 30 as shown in FIGS. 2A and 2B. ing.

  The depth dimension (radial dimension) of the second groove portion 39 is obtained by determining the influence of the second groove portion 39 on the torque fluctuation characteristics of the second rotor unit 19 through experiments and simulations, and the target torque fluctuation characteristics. It is only necessary to set appropriate dimensions after comparing the weights.

  Similarly to the above, the width dimension (circumferential dimension) of the second groove 39 is the result of obtaining the effect of the second groove 39 on the torque fluctuation characteristics of the second rotor unit 19 through experiments and simulations, and the target torque. Appropriate dimensions may be set after comparing the fluctuation characteristics.

  Similarly to the above, the shape of the second groove portion 39 is also a comparative measure of the results obtained through experiments and simulations of the influence of the second groove portion 39 on the torque fluctuation characteristics of the second rotor unit 19 and the target torque fluctuation characteristics. In addition, an appropriate dimension may be set. Although it does not specifically limit as a shape of the 2nd groove part 39, For example, seeing from an axial direction, V shape, semicircle shape, trapezoid shape, etc. can be illustrated.

  The second rotor unit 19 may be formed using a magnetic steel sheet in which the front and back surfaces of the magnetic steel sheet according to the first rotor unit 17 are reversed.

Actually, the first groove portion 37 and the second groove portion 39 are positioned symmetrically with respect to the d axis as shown in comparison with FIGS. 1B and 2B.
In other words, the first magnetic pole center 40 (see FIG. 1B) of the magnetic pole portion 33 provided in the first rotor unit 17 and the second magnetic pole center 42 (see FIG. 2B) of the magnetic pole portion 33 provided in the second rotor unit 19 are. , D axis symmetry.

[Effects of rotating electrical machine 11 (rotor assembly 16) according to the present invention]
Next, the effect of the rotary electric machine 11 (the rotor assembly 16) according to the present invention will be described with reference to FIG. FIG. 4 is an explanatory diagram showing the torque ripple reduction effect of the rotating electrical machine 11 (the rotor assembly 16 thereof) according to the present invention.

  In the rotating electrical machine 11 (the rotor assembly 16) according to the present invention, the outer peripheral surface 35 of the first rotor unit 17 is provided with a first groove portion 37 extending in the axial direction. On the other hand, the second groove portion 39 extending in the axial direction is provided on the outer peripheral surface 35 of the second rotor unit 19 at a position that does not overlap the first groove portion 37 in the circumferential direction. The first magnetic pole center 40 of the magnetic pole part 33 provided in the first rotor unit 17 and the second magnetic pole center 42 of the magnetic pole part 33 provided in the second rotor unit 19 are positioned symmetrically with respect to the d axis.

  In the rotating electrical machine 11 according to the present invention, when a motor current is passed through the stator coil 23, a rotating magnetic field is generated in the stator 13. Thus, the rotating magnetic field generated in the stator 13 interacts with the magnetic field by the magnetic pole portion 33 (see FIGS. 1A, 2A, and 3) provided in the first and second rotor units 17 and 19, respectively. The rotor assembly 16 is driven to rotate.

  According to the rotating electrical machine 11 (rotor assembly 16) of the present invention, as shown in FIG. 4, the torque waveform of the first rotor unit 17 when a motor current is passed through the stator coil 23 of the stator 13 Since the torque waveform related to the second rotor unit 19 is in an opposite phase relationship, the torque fluctuation range is suppressed in the combined torque waveform. As a result, an excellent torque ripple reduction effect can be obtained with a simple configuration.

  In particular, if a configuration (see FIG. 3) in which the first groove portion 37 and the second groove portion 39 are disposed adjacent to each other with the d-axis 30 interposed therebetween, the torque fluctuation range is suppressed as much as possible, and excellent torque is achieved. A ripple reduction effect can be obtained.

[Rotating electrical machines 11A to 11H according to first to eighth embodiments of the present invention]
Next, the rotating electrical machines 11A to 11H according to the first to eighth embodiments of the present invention will be described with reference to FIGS. 5A to 5H, 6A, and 6B.
5A to 5H are schematic configuration diagrams of the first to eighth rotating electric machines 11A to 11H according to the first to eighth embodiments of the present invention. FIG. 6A shows third, fourth, seventh, and eighth rotating electrical machines 11C, 11D, 11G, and 11H according to the third, fourth, seventh, and eighth embodiments of the present invention. FIG. 3 is a front view of a rotating electrical machine provided with a unit 18. 6B is an enlarged view of the periphery of the magnetic pole portion 33 provided in the third rotor unit 18 provided in the third, fourth, seventh, and eighth rotating electric machines 11C, 11D, 11G, and 11H illustrated in FIG. 6A. It is.

[Configuration and operation effect of first rotating electrical machine 11A]
As shown in FIG. 5A, the first rotating electrical machine 11 </ b> A is configured by rotatably providing a first rotor assembly 16 </ b> A provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. 16 A of 1st rotor assemblies are comprised combining the said 1st and 2nd rotor units 17 and 19 which exhibit a mutually common axial direction dimension so that it may be parallelly and coaxially joined to an axial direction.

  According to the first rotating electrical machine 11A (the first rotor assembly 16A), the torque waveform related to the first rotor unit 17 when the motor current is passed through the stator coil 23 of the stator 13, and the second rotor unit 19 Since the torque waveform is in an opposite phase relationship to each other, the torque fluctuation range is suppressed in the combined torque waveform. As a result, an excellent torque ripple reduction effect can be obtained with a simple configuration.

  Further, according to the first rotating electrical machine 11A (the first rotor assembly 16A), even if the first and second rotor units 17 and 19 are configured using materials having different magnetic permeability. The same excellent torque ripple reduction effect can be obtained as when the first and second rotor units 17 and 19 are made of materials having the same magnetic permeability.

[Configuration and effect of second rotating electrical machine 11B]
As shown in FIG. 5B, the second rotating electrical machine 11 </ b> B is configured by rotatably providing a second rotor assembly 16 </ b> B provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. The second rotor assembly 16B includes a plurality of (in the example of FIG. 5B, 3 in the example shown in FIG. Set), and is composed of alternating combinations.

  According to the second rotating electrical machine 11B (of the second rotor assembly 16B), as with the first rotating electrical machine 11A (of the first rotor assembly 16A), when a motor current is passed through the stator coil 23 of the stator 13, Since the torque waveform related to the first rotor unit 17 and the torque waveform related to the second rotor unit 19 are in an opposite phase relationship, the torque fluctuation range is suppressed in the combined torque waveform. As a result, an excellent torque ripple reduction effect can be obtained with a simple configuration.

  Further, according to the second rotating electrical machine 11B (the second rotor assembly 16B), similarly to the first rotating electrical machine 11A (the first rotor assembly 16A), temporarily using materials having different magnetic permeability. Even when the first and second rotor units 17 and 19 are configured, excellent torque is the same as when the first and second rotor units 17 and 19 are configured using materials having the same magnetic permeability. A ripple reduction effect can be obtained.

[Configuration and operation effect of third rotating electrical machine 11C]
As shown in FIG. 5C, the third rotating electrical machine 11 </ b> C is configured by rotatably providing a third rotor assembly 16 </ b> C provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. The third rotor assembly 16C sandwiches a third rotor unit 18 (see FIGS. 6A and 6B) between the first and second rotor units 17 and 19 that exhibit the same axial dimension. They are combined to be joined in parallel and coaxially in the axial direction.

In the third rotor unit 18, as shown in FIGS. 6A and 6B, some groove portions (a first groove portion 37 and a second groove portion 39) are provided on the outer peripheral surface (general surface) 35 along the circumferential direction. Not. Further, the axial dimension of the third rotor unit 18 is set larger than the axial dimension of the first and second rotor units 17 and 19.
Incidentally, the third magnetic pole center of the magnetic pole portion 33 provided in the third rotor unit 18 coincides with the d-axis 30.

  According to the third rotating electrical machine 11C (the third rotor assembly 16C), compared with the first and second rotating electrical machines 11A, 11B (the first and second rotor assemblies 16A, 16B), the torque ripple reduction effect. Can be relaxed.

[Configuration and operational effect of fourth rotating electrical machine 11D]
As shown in FIG. 5D, the fourth rotating electrical machine 11 </ b> D is configured by rotatably providing a fourth rotor assembly 16 </ b> D provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. The fourth rotor assembly 16D has a third rotor unit 18 (see FIG. 6A and FIG. 6B) positioned beside the first and second rotor units 17 and 19 that have a common axial dimension. Are combined in such a manner that they are joined in parallel and coaxially in the axial direction.

  According to the fourth rotating electrical machine 11D (the fourth rotor assembly 16D), similarly to the third rotating electrical machine 11C (the third rotor assembly 16C), the first and second rotating electrical machines 11A, 11B (the first thereof). , The torque ripple reduction effect can be mitigated as compared with the second rotor assemblies 16A, 16B).

[Configuration and effect of fifth rotating electrical machine 11E]
As shown in FIG. 5E, the fifth rotating electrical machine 11E is configured by rotatably providing a fifth rotor assembly 16E provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. Similar to the first rotor assembly 16A, the fifth rotor assembly 16E is configured by combining the first and second rotor units 17 and 19 so as to be joined in parallel and coaxially in the axial direction.

  However, in the first rotor assembly 16A of the first rotating electrical machine 11A, the first and second rotor units 17 and 19 have a common axial dimension, but the fifth rotor set of the fifth rotating electrical machine 11E. In the solid body 16E, the first rotor unit 17 differs from the second rotor unit 19 in that the axial dimension of the first rotor unit 17 is set larger than the axial dimension of the second rotor unit 19.

  In the first rotor assembly 16A of the first rotating electrical machine 11A, the first and second rotor units 17 and 19 are made of a material exhibiting a common magnetic permeability, but the fifth rotor of the fifth rotating electrical machine 11E. In the assembly 16E, first, the magnetic permeability exhibited by the first rotor unit 17 is lower than the magnetic permeability exhibited by the second rotor unit 19, and second, the motor is applied to the stator coil 23 of the stator 13. Considering that the torque fluctuation range of the torque waveform obtained by synthesizing the torque waveform related to the first rotor unit 17 and the torque waveform related to the second rotor unit 19 when current is passed is sufficiently suppressed. , The material, and the axial dimensions of the first and second rotor units 17 and 19 are set.

  According to the fifth rotating electrical machine 11E (the fifth rotor assembly 16E), similarly to the first rotating electrical machine 11A (the first rotor assembly 16A), when the motor current is passed through the stator coil 23 of the stator 13, Since the torque waveform related to the first rotor unit 17 and the torque waveform related to the second rotor unit 19 are in an opposite phase relationship, the torque fluctuation range is sufficiently suppressed in the combined torque waveform. The As a result, an excellent torque ripple reduction effect can be obtained with a simple configuration.

[Configuration and operational effect of sixth rotating electrical machine 11F]
As shown in FIG. 5F, the sixth rotating electrical machine 11 </ b> F is configured by rotatably providing a sixth rotor assembly 16 </ b> F provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. Similar to the first rotor assembly 16A, the sixth rotor assembly 16F is configured by combining the first and second rotor units 17 and 19 so as to be joined in parallel and coaxially in the axial direction.

  However, in the first rotor assembly 16A of the first rotating electrical machine 11A, the first and second rotor units 17 and 19 have a common axial dimension, but the fifth rotor set of the fifth rotating electrical machine 11E. In the solid body 16E, the first rotor unit 17 differs from the second rotor unit 19 in that the axial dimension of the first rotor unit 17 is set smaller than the axial dimension of the second rotor unit 19. However, the first and second rotor units 17 and 19 have the same axial dimensions as the fifth rotating electrical machine 11E.

  In the first rotor assembly 16A of the first rotating electrical machine 11A, the first and second rotor units 17 and 19 are made of a material exhibiting a common magnetic permeability, but the fifth rotor of the fifth rotating electrical machine 11E. In the assembly 16E, first, the magnetic permeability exhibited by the first rotor unit 17 is higher than the magnetic permeability exhibited by the second rotor unit 19, and second, the motor is applied to the stator coil 23 of the stator 13. Considering that the torque fluctuation range of the torque waveform obtained by synthesizing the torque waveform related to the first rotor unit 17 and the torque waveform related to the second rotor unit 19 when current is passed is sufficiently suppressed. , The material, and the axial dimensions of the first and second rotor units 17 and 19 are set.

  According to the sixth rotating electrical machine 11F (the sixth rotor assembly 16F), similarly to the fifth rotating electrical machine 11E (the fifth rotor assembly 16E), an excellent torque ripple reduction effect can be obtained with a simple configuration. Can do.

[Configuration and operational effect of seventh rotating electrical machine 11G]
As shown in FIG. 5G, the seventh rotating electrical machine 11G is configured by rotatably providing a seventh rotor assembly 16G provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. Similarly to the fifth rotor assembly 16E, the seventh rotor assembly 16G has first and second rotor units 17 and 19 having different axial dimensions (however, the axial dimension of the first rotor unit 17> the second rotor). The unit 19 is configured such that the axial dimensions of the unit 19 are joined in parallel and coaxially in the axial direction.

  However, in the fifth rotor assembly 16E of the fifth rotating electrical machine 11E, when the fifth rotor assembly 16E is configured by joining and combining only the first and second rotor units 17 and 19, the seventh rotation In the seventh rotor assembly 16G of the electric machine 11G, a third rotor unit 18 (see FIGS. 6A and 6B) is sandwiched between the first and second rotor units 17 and 19 having different axial dimensions. Are different from each other in that they are combined so as to be joined in parallel and coaxially in the axial direction.

  In the seventh rotor assembly 16G of the seventh rotating electrical machine 11G, first, the magnetic permeability exhibited by the first rotor unit 17 is lower than the magnetic permeability exhibited by the second rotor unit 19, 2, the torque fluctuation range of the torque waveform obtained by combining the torque waveform related to the first rotor unit 17 and the torque waveform related to the second rotor unit 19 when a motor current is passed through the stator coil 23 of the stator 13. In consideration of being sufficiently suppressed, the material and the axial dimensions of the first and second rotor units 17 and 19 are set in that the fifth rotor assembly 16E of the fifth rotating electrical machine 11E. Is the same.

  According to the seventh rotating electrical machine 11G (the seventh rotor assembly 16G), the torque ripple reduction effect can be reduced compared to the fifth rotating electrical machine 11E (the fifth rotor assembly 16E).

[Configuration and operation effect of the eighth rotating electrical machine 11H]
As shown in FIG. 5H, the eighth rotating electrical machine 11H is configured by rotatably providing an eighth rotor assembly 16H provided on the rotating shaft 15 in a hollow space provided in the annular stator 13. Similarly to the sixth rotor assembly 16F, the eighth rotor assembly 16H includes first and second rotor units 17 and 19 having different axial dimensions (however, the axial dimension of the first rotor unit 17 <the second rotor). The unit 19 is configured such that the axial dimensions of the unit 19 are joined in parallel and coaxially in the axial direction.

  However, in the sixth rotor assembly 16F of the sixth rotating electrical machine 11F, when the sixth rotor assembly 16F is configured by joining and combining only the first and second rotor units 17 and 19, the eighth rotation In the eighth rotor assembly 16H of the electric machine 11H, the third rotor unit 18 (see FIGS. 6A and 6B) is positioned beside the first and second rotor units 17 and 19 having different axial dimensions. The two are different in that they are configured to be joined in parallel and coaxially in the axial direction.

  In the eighth rotor assembly 16H of the eighth rotating electrical machine 11H, firstly, the magnetic permeability exhibited by the first rotor unit 17 is higher than the magnetic permeability exhibited by the second rotor unit 19, 2, the torque fluctuation range of the torque waveform obtained by combining the torque waveform related to the first rotor unit 17 and the torque waveform related to the second rotor unit 19 when a motor current is passed through the stator coil 23 of the stator 13. The material and the axial dimensions of the first and second rotor units 17 and 19 are set in consideration of being sufficiently restrained. The sixth rotor assembly 16F of the sixth rotating electrical machine 11F is Is the same.

  According to the eighth rotating electrical machine 11H (the eighth rotor assembly 16H), the torque ripple reduction effect can be mitigated compared to the sixth rotating electrical machine 11F (the sixth rotor assembly 16F).

[Other Embodiments]
The plurality of embodiments described above show examples of realization of the present invention. Therefore, the technical scope of the present invention should not be limitedly interpreted by these. This is because the present invention can be implemented in various forms without departing from the gist or main features thereof.

For example, in the description of the basic configuration of the rotating electrical machine 11 according to the present invention, the first and second rotor units 17 and 19 include three magnet slots 29 and permanent magnets 31 that are components of the magnetic pole portion 33, respectively. Although it has been described by exemplifying the configuration that is set and formed in a substantially V shape that opens outward in the radial direction, the present invention is not limited to this example.
The number and shape of the magnet slot 29 and the permanent magnet 31 that are components of the magnetic pole portion 33 may be any number and shape as long as the rotating electrical machine 11 does not hinder the rotational performance.

Further, in the description of the basic configuration of the rotating electrical machine 11 according to the present invention, the configuration including the 12 magnetic pole portions and the 72 slots 22 has been described by way of example of the rotating electrical machine 11, but the present invention is not limited to this example.
The number of magnetic pole portions / slots may be any number as long as the rotating electrical machine 11 does not hinder the rotational performance.

DESCRIPTION OF SYMBOLS 11 Rotating electric machine 11A-11H 1st-8th rotating electric machine 13 Stator 15 Rotating shaft 16 Rotor assembly 16A-16H 1st-8th rotor assembly 17 1st rotor unit 18 3rd rotor unit 19 2nd Rotor unit 21 Stator core 23 Stator coil (coil)
30 d-axis 31 permanent magnet (field magnet)
33 Magnetic pole part 35 Outer peripheral surface 37 First groove part 39 Second groove part 40 First magnetic pole center 42 Second magnetic pole center

Claims (7)

A rotor assembly of a rotating electrical machine constituted by combining a plurality of rotor units each having a magnetic pole portion having a field magnet extending in the axial direction in parallel and coaxially in the axial direction,
The plurality of rotor units include at least first and second rotor units,
The magnetic pole portions provided in the first and second rotor units share the field magnet,
A first groove extending in the axial direction is provided on the outer peripheral surface of the first rotor unit,
On the outer peripheral surface of the second rotor unit, a second groove portion extending in the axial direction is provided at a position that does not overlap the first groove portion in the circumferential direction,
The first magnetic pole center of the magnetic pole part provided in the first rotor unit and the second magnetic pole center of the magnetic pole part provided in the second rotor unit are positioned symmetrically with respect to the d axis.
A rotor assembly for a rotating electrical machine. A rotor assembly for a rotating electrical machine according to claim 1,
The dimensions of the first and second rotor units in the axial direction are set to be equal to each other. A rotor assembly for a rotating electrical machine according to claim 1 or 2,
A plurality of sets of the first and second rotor units are provided. A rotor assembly for a rotating electrical machine. A rotor assembly for a rotating electrical machine according to any one of claims 1 to 3,
The plurality of rotor units further include a third rotor unit having no groove on an outer peripheral surface, and the first, second, and third rotor units are combined in parallel and coaxially in the axial direction. A rotor assembly of a rotating electrical machine. A rotor assembly for a rotating electrical machine according to any one of claims 1 to 4,
The first and second rotor units are formed by laminating steel plates having the same shape,
The rotor assembly of a rotating electrical machine, wherein the second rotor unit is formed using a steel plate in a state where the front and back surfaces of the steel plate according to the first rotor unit are reversed. A rotor assembly for a rotating electrical machine according to claim 5,
The dimension in the axial direction of the first rotor unit is set to a smaller value than the dimension in the axial direction of the second rotor unit,
The steel plate according to the first rotor unit and the steel plate according to the second rotor unit are made of materials exhibiting mutually different magnetic permeability,
A rotor assembly for a rotating electrical machine, wherein a magnetic permeability of a steel plate according to the first rotor unit is set to be higher than a magnetic permeability of a steel plate according to the second rotor unit. A rotor assembly for a rotating electrical machine according to any one of claims 1 to 6,
And a cylindrical stator having a stator core provided with a coil.

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