Rotating electric machines

Abstract

A rotating electrical machine (100) includes a stator (1) and a rotor (2), wherein the rotor (2) includes a plurality of rotor units (201) and (202) stacked in an axial direction. Each of the rotor units (201) and (202) includes a pair of permanent magnets (21) and one or more rows of gaps (22a) and (22b). The gaps (22a) and (22b) have an arc shape, and both ends of the arc shape are arranged on the outer peripheral side of the rotor (2). When the angle formed by two straight lines connecting the positions of the two ends of the arc shape and the center of the rotation axis of the rotor (2) is defined as the arc angle, at least one of the arc angle and the number of rows of the gaps (22a) is different between at least two rotor units (201) and (202).

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine including a rotor and a stator. Background Art

[0002] In a rotating electrical machine, as a method of reducing torque ripple, there is generally a technique of shifting the magnetic center angle of a rotor by the angle of one slot of a stator in the rotation direction.

[0003] However, there is a technical problem that when the magnetic center angle of the rotor is tilted, the magnetic resistance difference at the rotational position becomes smaller, so the output torque decreases.

[0004] In addition, as another method for reducing torque ripple, the following scheme has been proposed: by gradually changing the area of ​​the non-magnetic region of the rotor in the stacking direction, the change of the magnetic flux of the magnet interlinked with the stator is mitigated. According to this method, the torque fluctuation can be suppressed, and thus the torque ripple can be reduced (for example, refer to Patent Document 1).

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2009-219291 Summary of the invention

[0008] Technical issues to be solved by the invention

[0009] As described above, according to the rotating electrical machine of Patent Document 1, it is possible to reduce torque ripple caused by the magnetic flux of the magnet. However, there is a technical problem that the output torque is reduced as a result of the reduction of the magnetic flux of the magnet.

[0010] The present invention has been made to solve the technical problem, and an object of the present invention is to provide a rotating electric machine capable of reducing torque ripple and suppressing a decrease in output torque.

[0011] Technical solutions for solving technical problems

[0012] The rotating electric machine of the present invention comprises an annular stator and a rotor arranged on the inner side of the stator, the rotor having a multi-stage rotor unit stacked in the axial direction, each rotor unit of the multi-stage rotor unit having a pair of permanent magnets and more than one row of gaps arranged in the radial direction between the pair of permanent magnets, the gap having an arc shape extending in the circumferential direction and being convex in the inner diameter direction, and when the angle formed by two straight lines connecting the positions of the two ends of the arc shape and the center of the rotation axis of the rotor is set as the arc angle of the gap, at least either one of the arc angle of the gap and the number of rows of the gap is different between at least two rotor units.

[0013] Effects of the Invention

[0014] According to the rotating electrical machine of the present invention, it is possible to reduce torque ripple and suppress a decrease in output torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view showing the overall structure of the rotating electrical machine according to the first embodiment of the present invention.

[0016] Figure 2 It is a perspective view showing the structure of the rotating electrical machine according to the first embodiment of the present invention.

[0017] Figure 3 for Figure 1 Sectional view at AA.

[0018] Figure 4 It is a perspective view showing the structure of a rotor of a rotating electrical machine according to Embodiment 1 of the present invention.

[0019] Figure 5 This is an exploded perspective view showing the structure of one pole of the rotor of the rotating electrical machine according to the first embodiment of the present invention.

[0020] Figure 6 To show Figure 5 A partial cross-sectional view of the first rotor unit shown.

[0021] Figure 7 To show Figure 5 A partial cross-sectional view of the second rotor unit shown.

[0022] Figure 8 This is a diagram showing a graph of analysis results for verifying the torque ripple of the rotating electrical machine according to the first embodiment of the present invention.

[0023] Fig. 9 It is a partial cross-sectional view of a first rotor unit of a rotating electrical machine according to Embodiment 2 of the present invention.

[0024] Fig.10 It is a partial cross-sectional view of a second rotor unit of a rotating electrical machine according to Embodiment 2 of the present invention.

[0025] Fig.11 It is a diagram showing the flow of magnetic flux from the stator in the first rotor unit of the rotating electrical machine according to Embodiment 2 of the present invention.

[0026] Fig.12 It is a diagram showing the flow of magnetic flux from the stator in the first rotor unit of the rotating electrical machine according to Embodiment 2 of the present invention.

[0027] Fig.13It is a diagram showing the flow of magnetic flux from the stator in the second rotor unit of the rotating electrical machine according to the second embodiment of the present invention.

[0028] Fig.14 It is a diagram showing the flow of magnetic flux from the stator in the second rotor unit of the rotating electrical machine according to the second embodiment of the present invention.

[0029] Fig.15 It is a partial cross-sectional view of a first rotor unit of a rotating electrical machine according to Embodiment 3 of the present invention.

[0030] Fig.16 It is a partial cross-sectional view of a second rotor unit of a rotating electrical machine according to Embodiment 3 of the present invention.

[0031] Fig.17 It is an exploded perspective view showing the structure of one pole of a rotor of a rotating electrical machine according to a fourth embodiment of the present invention.

[0032] Fig.18 It is an exploded perspective view showing the structure of one pole of a rotor of a rotating electrical machine according to Embodiment 5 of the present invention.

[0033] Fig.19 It is a partial cross-sectional view of a first rotor unit of a rotating electrical machine according to a sixth embodiment of the present invention.

[0034] Fig. 20 It is a partial cross-sectional view of a second rotor unit of a rotating electrical machine according to Embodiment 6 of the present invention.

[0035] Fig.21 To show the structure of the rotating electrical machine according to the seventh embodiment of the present invention Figure 1 Sectional view at AA.

[0036] Fig. 22 It is a partial cross-sectional view of a first rotor unit of a rotating electrical machine according to a seventh embodiment of the present invention.

[0037] Fig.23 It is a partial cross-sectional view of a second rotor unit of a rotating electrical machine according to a seventh embodiment of the present invention.

[0038] Fig.24 It is an exploded perspective view showing the structure of one pole of a rotor of a rotating electrical machine according to an eighth embodiment of the present invention.

[0039] Fig.25 It is an exploded perspective view showing the structure of one pole of a rotor of a rotating electrical machine according to an eighth embodiment of the present invention.

[0040] Reference numerals

[0041] 1: stator; 2: rotor; 4: spindle; 5: bearing; 9A: first housing; 9B: second housing; 10: stator core; 12: stator coil; 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j: permanent magnet; 22, 22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h, 22i, 22j: gap; 23a, 23b, 23c, 23d, 23e, 23f, 23g, 23h, 23i, 23j: flux barrier; 41: stator; 42: rotor; 60: d-axis; 100, 100A: rotating motor; 101: core back; 102: slot; 103: tooth; 201, 203: 1st rotor unit; 202, 204: 2nd rotor unit; 250: main shaft insertion hole. DETAILED DESCRIPTION

[0042] Hereinafter, embodiments of the rotating electrical machine according to the present invention will be described using the drawings.

[0043] Implementation method 1.

[0044] Figure 1 It is a cross-sectional view showing the overall structure of the rotating electrical machine according to the first embodiment of the present invention. Figure 2 for Figure 1 The three-dimensional view of the rotating electrical machine shown in FIG. Figure 2 In, yes Figure 1 Some structural elements such as the housing 9A and 9B, the main shaft 4, etc. are omitted from the illustration. Figure 3 for Figure 1 Sectional view at AA.

[0045] In the first embodiment, a three-phase permanent magnet rotating electrical machine of distributed winding type with 8 poles and 48 slots is taken as an example and described as the rotating electrical machine 100 .

[0046] like Figure 1 to Figure 3 As shown in FIG. 1 , the rotating electrical machine 100 is configured to include a ring-shaped stator 1 and a cylindrical rotor 2 disposed inside the stator 1. A gap is provided between the inner peripheral surface of the stator 1 and the outer peripheral surface of the rotor 2. Figure 2 As shown, a main shaft insertion hole 250 is provided in the central portion of the rotor 2. The main shaft insertion hole 250 is a through hole that penetrates the rotor 2 in the axial direction. The main shaft 4 is inserted into the main shaft insertion hole 250. The main shaft 4 is fixed to the rotor 2.

[0047] like Figure 1 As shown, two bearings 5 ​​are engaged with the outer circumferential surfaces at both ends of the main shaft 4 in the axial direction. The outer circumferential surfaces of the bearings 5 ​​are engaged with the inner circumferential surface of the first housing 9A, so that the bearings 5 ​​are held by the first housing 9A. Thus, the main shaft 4 is supported by the first housing 9A.

[0048] like Figure 1 As shown, the stator 1 is configured to include a stator core 10 and a stator coil 12. The stator core 10 is composed of an armature core. The stator 1 is fixed to the second housing 9B by engaging the outer circumferential surface of the stator core 10 with the inner circumferential surface of the second housing 9B. In addition, the first housing 9A and the second housing 9B constitute a housing as a frame of the rotating electrical machine 100.

[0049] With the above configuration, the rotor 2 is supported by the main shaft 4 so as to be rotatable relative to the stator 1. The rotor 2 rotates around the main shaft 4. Hereinafter, the center line of the main shaft 4 in the axial direction is referred to as the rotation axis X.

[0050] Next use Figure 3 , the structure of the stator core 10 of the stator 1 is described. The stator core 10 is configured to include a core back 101 in an annular shape, 48 teeth 103 protruding from the core back 101 toward the rotor 2 side, and 48 slots 102 formed between the teeth 103. The teeth 103 are arranged at intervals in the circumferential direction along the inner circumference of the stator core 10. The teeth 103 are arranged, for example, at equal intervals. In order to reduce eddy currents, the stator core 10 is formed by stacking a plurality of stator core sheets of the same shape in the axial direction. The stator core sheets are formed by stamping the same shape from electromagnetic steel sheets. The top end of each tooth 103 of the stator core 10 is opposite to the outer peripheral surface of the rotor 2 via a gap. The stator coil 12 is composed of 48 windings. The 48 windings are accommodated in the slots 102. Each winding is wound around the stator core 10 in a distributed winding manner. The so-called distributed winding method is a method in which the winding is wound across a plurality of teeth 103. Each phase of the stator coil 12 is composed of 16 windings. Therefore, the stator coil 12 is composed of 48 windings in total for 3 phases. The 48 windings are connected. Each winding is connected to an inverter (not shown) as a power converter. By passing a three-phase AC current from the inverter to the stator coil 12, a rotating magnetic field is generated from the stator 1 to the air gap, thereby generating torque in the rotor 2.

[0051] Figure 4 FIG. 2 is an overall view of the rotor 2 of the first embodiment. Figure 4 As shown, the rotor 2 is configured to include a first rotor unit 201 and a second rotor unit 202. The second rotor unit 202 is stacked on the first rotor unit 201. The first rotor unit 201 and the second rotor unit 202 have the same outer dimensions.

[0052] As will be described later, the rotor 2 has eight pairs of permanent magnets 21. The eight pairs of permanent magnets form magnetic poles. Therefore, the rotor 2 has eight magnetic poles. The central angles of the eight magnetic poles of the rotor 2 are equal. Therefore, in the first embodiment, the central angles of the eight magnetic poles are 45 degrees. Figure 5FIG. 1 is an exploded perspective view showing one magnetic pole portion among the eight magnetic poles of the rotor 2 of the first embodiment. Figure 5 As shown in FIG. 1 , the first rotor unit 201 and the second rotor unit 202 constituting one magnetic pole have basically the same structure, but the structures of the gaps 22a and 22b to be described later are different. In the following description, corresponding structural elements in the first rotor unit 201 and the second rotor unit 202 are represented by recording the same number followed by a lowercase letter, such as "22a" and "22b".

[0053] Figure 6 To show Figure 5 The cross-sectional shape of the first rotor unit 201 is shown in FIG. Figure 6 A portion of one of the eight magnetic poles of the rotor 2 is shown. Figure 6 FIG. 2 shows a cross section of the first rotor unit 201 along a plane perpendicular to the axial direction. Since the eight magnetic poles of the rotor 2 have the same structure, only the structure of one magnetic pole portion will be described below. Figure 6 As shown, the first rotor unit 201 is configured to include a pair of permanent magnets 21 a for each magnetic pole, a gap 22 a formed between the pair of permanent magnets 21 a , and a pair of flux barriers 23 a .

[0054] A pair of permanent magnets 21a are inserted and fixed in the magnet insertion hole 24a. Here, the center line of the magnetic pole formed by the pair of permanent magnets 21a is called the d-axis 60. The pair of permanent magnets 21a are arranged in a V-shape to be linearly symmetrical with respect to the d-axis 60. Specifically, the distance between the pair of permanent magnets 21a gradually increases from the center of the rotor 2 to the outer periphery. However, the pair of permanent magnets 21a are separated from each other and do not contact. In addition, three rows of gaps 22a extending in the circumferential direction are formed between the pair of permanent magnets 21a. Each gap 22a is a gap having an arc shape that bends inward. The opening of the arc-shaped gap 22a is opposite to the inner circumference of the stator 1. The three rows of gaps 22a are arranged in a concentric circle. Each gap 22a is formed into a shape that is linearly symmetrical with the d-axis 60 as the center. In addition, the inner diameter side of each gap 22a is convex. That is, in each slit 22a, both ends of the arc shape are arranged on the outer peripheral side of the rotor 2, and the central part of the arc shape is arranged closer to the center side of the rotor 2 than the both ends. In addition, among the three rows of slits 22a, the circumferential length of the slit 22a arranged on the outermost peripheral side of the rotor 2 is the shortest, and the circumferential length of the slit 22a arranged on the innermost side of the rotor 2 is the longest. However, the widths of the three rows of slits 22a are the same. In addition, a pair of flux barriers 23a are provided on the outer peripheral portion of the rotor 2. Each flux barrier 23a is formed to be connected to the magnet insertion hole 24a of the permanent magnet 21a.

[0055] Here, Figure 3The intersection of the cross section of the rotor 2 shown in FIG. 1 and the rotation axis X is referred to as the rotation axis center O. Figure 6 Although the rotation axis center O is not shown in the figure, the angle between the two straight lines connecting the outermost positions of the two ends of the gap 22a and the rotation axis center O is defined as the "arc angle". Figure 6 As shown in FIG. 1 , the slots 22a are arranged in three rows, and the arc angles of the slots 22a are θ1, θ2, and θ3, respectively. In addition, the angle between the innermost position of the two ends of the outer circumference of the flux barrier 23a and the straight line connecting the center O of the rotation axis is defined as the "angle formed by a pair of flux barriers". In this case, Figure 6 As shown, the pair of flux barriers 23a are formed so that the angle between the pair of flux barriers 23a is θm.

[0056] in addition, Figure 7 To show Figure 5 The cross-sectional shape of the second rotor unit 202 is shown in FIG. Figure 7 A portion of one of the eight magnetic poles of the rotor 2 is shown. Figure 7 FIG. 2 shows a cross section of the second rotor unit 202 along a plane perpendicular to the axial direction. Figure 7 As shown, the second rotor unit 202 is configured to include a pair of permanent magnets 21 b for each magnetic pole, a gap 22 b formed between the pair of permanent magnets 21 b, and a magnetic flux barrier 23 b.

[0057] A pair of permanent magnets 21b are inserted and fixed in the magnet insertion hole 24b. Here, the center line of the magnetic pole formed by the pair of permanent magnets 21b is called the d-axis 60. The pair of permanent magnets 21b are arranged in a V-shape to be linearly symmetrical with respect to the d-axis 60. Specifically, the distance between the pair of permanent magnets 21b gradually increases from the center of the rotor 2 to the periphery. However, the pair of permanent magnets 21b are separated from each other and do not contact. In addition, two rows of gaps 22b are formed between the pair of permanent magnets 21b. Each gap 22b is a gap having an arc shape that bends inward. The opening of the arc-shaped gap 22b is opposite to the inner circumference of the stator 1. The two rows of gaps 22b are arranged in a concentric circle. Each gap 22b is formed into a shape that is linearly symmetrical with the d-axis 60 as the center. In addition, the inner diameter side of each gap 22b is convex. That is, each slit 22b is configured so that the two ends of the arc shape are close to the outer peripheral side of the rotor 2, and the central part of the arc shape is closer to the center side of the rotor 2 than the two ends. In addition, among the two rows of slits 22b, the circumferential length of the slit 22b set on the outermost peripheral side of the rotor 2 is the shortest, and the circumferential length of the slit 22b set on the innermost side of the rotor 2 is the longest. However, the widths of the two rows of slits 22b are the same. In addition, a pair of flux barriers 23b are provided on the outer peripheral portion of the rotor 2. Each flux barrier 23b is formed to be connected to the magnet insertion hole 24b of the permanent magnet 21b.

[0058] Here, as mentioned above, Figure 3 As shown in FIG. 1 , the rotation axis center through which the rotation axis X of the rotor 2 passes is referred to as the rotation axis center O. Figure 7 Although the rotation axis center O is not shown in the figure, the angle between the outermost positions of the two ends of the gap 22b and the rotation axis center O is defined as the "arc angle". Figure 7 As shown, the slots 22b are arranged so that the arc angles of the two rows of slots 22b are respectively θ'1 and θ'2. In addition, a pair of flux barriers 23b are formed so that the angle between the innermost position of the two ends of the outer circumference of the rotor 2 of the flux barriers 23b and the straight line of the rotation axis center O is θm.

[0059] In addition, here Figure 6 and Figure 7 In the embodiment, although the arc angles θ1, θ2, θ3, θ'1, and θ'2 are set as the angles between the straight line connecting the outermost positions of the two ends of the gaps 22a and 22b and the rotation axis center O, it is not limited to this case, and it may be set as the angle between the straight line connecting the innermost positions of the two ends of the gaps 22a and 22b and the rotation axis center O. In addition, similarly, although the angle θm is set as the angle between the straight line connecting the innermost positions of the two ends of the flux barriers 23a and 23b and the rotation axis center O, it is not limited to this case, and it may be set as the angle between the straight line connecting the outermost positions of the two ends of the flux barriers 23a and 23b and the rotation axis center O. Furthermore, in the first embodiment, although the angle θm is defined by the positions of the two ends of the flux barriers 23a and 23b, it is not limited to this case, and the angle θm may be defined by the positions of the two ends of the permanent magnets 21a and 21b.

[0060] As described above, the arc angles and the number of rows of the gaps 22a and 22b are different between the first rotor unit 201 and the second rotor unit 202 that are adjacent in the axial direction. Accordingly, the magnetic path through which the magnetic flux of the first rotor unit 201 passes is different from the magnetic path through which the magnetic flux of the second rotor unit 202 passes. Therefore, in the first embodiment, the magnetic fluxes of the permanent magnets 21a and 21b are different from each other between the rotor units 201 and 202.

[0061] In addition, although the first embodiment shows a case where both the arc angle and the number of rows between the slits 22a and the slits 22b are different in the first rotor unit 201 and the second rotor unit 202, the present invention is not limited to this case, as long as at least one of the arc angle and the number of rows is different.

[0062] On the other hand, the shapes and positions of the magnet insertion holes 24a into which the pair of permanent magnets 21a are inserted and the magnet insertion holes 24b into which the pair of permanent magnets 21b are inserted are the same in the first rotor unit 201 and the second rotor unit 202. In addition, the shapes of the pair of permanent magnets 21a and the pair of permanent magnets 21b are also the same in the first rotor unit 201 and the second rotor unit 202.

[0063] The following is a description of the effects obtained by the rotating electrical machine 100 according to the first embodiment. As shown in the following formula (1), the electromagnetic force F is proportional to the square of the gap magnetic flux density B, and the magnetic flux density can be expressed as a function of the spatial harmonic order k and the temporal harmonic order v. Here, θ is set as the circumferential position, t is set as the time, and ω is set as the angular frequency. In addition, A(k, v) represents the amplitude for the spatial harmonic order and the temporal harmonic order, and φ(k, v) represents the phase for the harmonic spatial order and the harmonic temporal order.

[0064] [Mathematical formula 1]

[0065]

[0066]

[0067] Furthermore, the gap magnetic flux density B is calculated based on the multiplication result of the magnetic permeance of the rotor 2 and the magnetomotive force of the permanent magnets 21a and 21b. The magnetic permeability is the density of the magnetic resistance. The amplitude and phase of the harmonic component of the magnetic permeance of the rotor 2 vary according to the arc angle and number of the gaps 22a and 22b and the flux barriers 23a and 23b. As a result, the amplitude A (k, v) and phase φ (k, v) of the gap magnetic flux density vary. Here, the torque fluctuation is a form of electromagnetic force F that can be represented by the spatial order 0 and the time order v. Therefore, it can be said that the amplitude and phase vary under the influence of the arc angle and number of the gaps 22a and 22b and the flux barriers 23a and 23b.

[0068] Furthermore, in a permanent magnet rotating electric machine, the multiplication result of the magnetomotive force and the magnetic permeability has a great influence on the gap magnetic flux density B. Therefore, by changing the shapes of the gaps 22a and 22b and the magnetic flux barriers 23a and 23b so that the magnetic paths through which the magnetic flux of the magnet passes are different, the amplitude and phase of the torque fluctuation can be changed. In addition, by setting the gaps 22a and 22b to arc-shaped gaps, it is possible to form a d-axis where the magnetic flux is difficult to flow and a q-axis perpendicular to the d-axis where the magnetic flux is easy to flow. As a result, it has the effect of increasing the reluctance torque.

[0069] Figure 8 FIG. 2 shows the change in torque of the rotating electrical machine 100 according to the first embodiment analyzed by the finite element method. The horizontal axis represents the electrical angle, and the vertical axis represents the torque. Figure 8 In FIG. 8 , the solid line 80 shows the torque pulsation generated in the first rotor unit 201, the dotted line 81 shows the torque pulsation generated in the second rotor unit 202, and the single-point chain line 82 shows the torque pulsation generated in the rotor 2 formed by combining the first rotor unit 201 and the second rotor unit 202. In the first rotor unit 201 and the second rotor unit 202, the amplitude and phase of a certain order of torque pulsation generated under the same current condition are different. Therefore, the axial length ratio is set in such a way that the amplitude of a specific order of torque pulsation of the first rotor unit 201 and the second rotor unit 202 is the same and the phase is reversed, so that as a whole rotor unit, the torque fluctuation can be offset without reducing the electrical angle average torque. Here, the so-called axial length ratio is the ratio of the heights of each rotor unit.

[0070] In addition, in the above description, although the slits 22a and 22b are described as having an arc shape, this is not limited to the case. The slits 22a and 22b only need to be U-shaped extending in the circumferential direction and convex on the inner diameter side, and thus may be a shape formed by combining three or more straight lines, a shape formed by combining three or more curves, or may be composed of one arc.

[0071] As described above, in the first embodiment, the rotor 2 has two-stage rotor units stacked in the axial direction, namely, the first rotor unit 201 and the second rotor unit 202. The first rotor unit 201 and the second rotor unit 202 each have a pair of permanent magnets 21a and 21b and one or more rows of arc-shaped slits 22a and 22b respectively provided between the pair of permanent magnets 21a and 21b. At this time, when the angle formed by the positions of the two ends of the arc-shaped slits 22a and 22b and the two straight lines of the rotation axis center O of the rotor 2 is defined as the arc angle, at least one of the arc angle of the slits 22a and 22b and the number of rows of the slits 22a and 22b is different between the first rotor unit 201 and the second rotor unit 202 adjacent in the axial direction. According to this structure, since the phase of the torque ripple generated in each rotor unit is different, the torque ripple when the rotor 2 is regarded as a whole can be offset. According to this, the torque ripple can be reduced. In addition, in the first embodiment, since the rotor 2 is not skewed, the reduction in output torque can be suppressed without reducing the output torque. Furthermore, in the first embodiment, since the magnetic flux of the gap and the magnetic flux of the flux barrier are taken into consideration, the reduction in torque output caused by the reduction in magnetic flux can also be suppressed.

[0072] Implementation method 2.

[0073] Fig. 9 and Fig.10 It is a cross-sectional view of a first rotor unit 201 and a second rotor unit 202 of a rotating electrical machine according to Embodiment 2 of the present invention. Fig. 9 and Fig.10 With the above Figure 6 and Figure 7 Likewise, one magnetic pole portion of the eight magnetic poles of the rotor 2 is shown. Fig. 9 FIG. 2 shows a cross section of the first rotor unit 201 along a plane perpendicular to the axial direction. Fig.10 A cross section of the second rotor unit 202 along a plane perpendicular to the axial direction is shown.

[0074] The difference between the above-mentioned first embodiment and the present second embodiment will be described.

[0075] In the first embodiment, the slits 22a of the first rotor unit 201 are in three rows and the slits 22b of the second rotor unit 202 are in two rows. However, in the second embodiment, the slits 22c of the first rotor unit 201 and the slits 22d of the second rotor unit 202 are each in one row.

[0076] In the first embodiment, the widths of the three rows of slits 22a and the two rows of slits 22b are all the same, but in the second embodiment, the width of slits 22c is different from the width of slits 22d. Specifically, the width of slits 22c is larger than the width of slits 22d.

[0077] Since the other structures are the same as those in the first embodiment, the description thereof will be omitted here.

[0078] The second embodiment will be described in detail below.

[0079] like Fig. 9 As shown in FIG. 1 , similarly to the first embodiment, the first rotor unit 201 is configured to include a pair of permanent magnets 21c, a gap 22c, and a pair of flux barriers 23c. Fig.10 As shown, similarly to the first embodiment, the second rotor unit 202 is configured to include a pair of permanent magnets 21d, a gap 22d, and a pair of flux barriers 23d.

[0080] The arc angle of the slit 22c of the first rotor unit 201 is θ1. On the other hand, the arc angle of the slit 22d of the second rotor unit 202 is θ2. Here, the arc angle θ1 is larger than the arc angle θ2. In addition, as described above, the width of the slit 22c is larger than the width of the slit 22d. Here, the ends of the slits 22c and 22d located at the outer periphery of the rotor 2 are referred to as "outer periphery ends". The edges of the outer periphery ends of the slits 22c and 22d are arranged along the outer periphery of the rotor 2. At this time, the circumferential distance w1 indicating the width of the outer periphery end of the slit 22c is larger than the circumferential distance w2 indicating the width of the outer periphery end of the slit 22d. In addition, in the above description, it is described that the width of the slit 22c is larger than the width of the slit 22d as a whole. However, it is not limited to this case, as long as at least the width of the outer periphery end of the slit 22c is larger than the width of the outer periphery end of the slit 22d.

[0081] Fig.11 and Fig.12 1 is a diagram showing a part of the flow of magnetic flux from the stator 1 at time t=T1 and time t=T2 in the first rotor unit 201 in the second embodiment. Fig.11 and Fig.12 In FIG. 2 , the mark “×” written on the arrow indicates that the flow of magnetic flux is blocked by the gap 22 c.

[0082] Fig.13 and Fig.14 : is a diagram showing a part of the flow of magnetic flux from the stator 1 at the time t=T1 and the time t=T2 in the second rotor unit 202 in the second embodiment. Fig.14 In FIG. 2 , the mark “△” written on the arrow indicates a state in which the flow of magnetic flux is not completely blocked by the gap 22 d.

[0083] First, the first rotor unit 201 is shown. Fig.11 and Fig.12 At time t = T1 Fig.11 In the figure, the right side of the two arrows is marked with an "×". Fig.12 In FIG. 1 , the left side of the two arrows is marked with an “×”. Therefore, it can be seen that the timing at which the gap 22c blocks the magnetic flux from the stator 1 varies depending on the position.

[0084] Next, for the same time t = T1 Fig.11 The gap 22c and Fig.13 The gap 22d is compared. Fig.11 In the gap 22c, one of the two arrows is marked with an "×", indicating that the flow of magnetic flux is blocked by the gap 22c. Fig.13In the gap 22d, there is no "X" mark on both sides of the two arrows, so it can be seen that the flow of magnetic flux is not blocked by the gap 22d.

[0085] Similarly, for other times at the same time t = T2 Fig.12 The gap 22c and Fig.14 The gap 22d is compared. Fig.12 In the gap 22c, one of the two arrows has an "×" mark, which shows that the flow of magnetic flux is blocked by the gap 22c. Fig.14 In the gap 22d, there is a "△" mark on one of the two arrows, which shows that the flow of magnetic flux is not completely blocked by the gap 22d.

[0086] As can be seen, at any time between time t=T1 and time t=T2, the gap 22c of the first rotor unit 201 blocks the flow of magnetic flux from the stator 1 more efficiently than the gap 22d of the second rotor unit 202. The reason for this is that the circumferential distance w1 of the outer peripheral end of the gap 22c is greater than the circumferential distance w2 of the outer peripheral end of the gap 22d. That is, as the circumferential distance of the outer peripheral end of the gap increases, the flow of magnetic flux from the stator 1 is more efficiently blocked.

[0087] As described above, by changing the circumferential distance between the outer peripheral ends of the slots 22c and 22d, the timing at which the magnetic flux from the stator 1 is blocked can be changed. Therefore, in the second embodiment, the circumferential distances w1 and w2 between the outer peripheral ends of the slots 22c and 22d are set to different values. By appropriately setting the circumferential distances w1 and w2 between the outer peripheral ends of the slots 22c and 22d to appropriate values, the phase of the torque ripple generated in each of the first rotor unit 201 and the second rotor unit 202 can be appropriately adjusted.

[0088] As described above, in the second embodiment, the circumferential distances w1 and w2 of the outer peripheral ends of the arc-shaped gaps 22c and 22d are different from each other between the first rotor unit 201 and the second rotor unit 202 adjacent in the axial direction. Therefore, the phase of the torque ripple generated in each rotor unit is different, so when the rotor 2 is regarded as a whole, the torque ripple can be offset. As a result, the reduction in torque output can be suppressed and the torque ripple can be reduced.

[0089] Implementation method 3.

[0090] Fig.15 and Fig.16 It is a cross-sectional view of a first rotor unit 201 and a second rotor unit 202 of a rotating electrical machine according to Embodiment 3 of the present invention. Fig.15 and Fig.16 With the above Figure 6 and Figure 7 Likewise, one magnetic pole portion of the eight magnetic poles of the rotor 2 is shown. Fig.15 FIG. 2 shows a cross section of the first rotor unit 201 along a plane perpendicular to the axial direction. Fig.16 A cross section of the second rotor unit 202 along a plane perpendicular to the axial direction is shown.

[0091] The differences between the above-mentioned first and second embodiments and the present third embodiment will be described.

[0092] In the first embodiment, the angle θm formed by the pair of magnetic flux barriers 23a of the first rotor unit 201 is the same as the angle θm formed by the pair of magnetic flux barriers of the second rotor unit 202. However, in the third embodiment, the angle θm1 formed by the pair of magnetic flux barriers 23e of the first rotor unit 201 is different from the angle θm2 formed by the pair of magnetic flux barriers 23f of the second rotor unit 202.

[0093] In the first embodiment, the slits 22a of the first rotor unit 201 are in three rows and the slits 22b of the second rotor unit 202 are in two rows. However, in the third embodiment, the slits 22e of the first rotor unit 201 and the slits 22f of the second rotor unit 202 are each in one row.

[0094] In the second embodiment, the width of the slit 22c of the first rotor unit 201 is different from the width of the slit 22d of the second rotor unit 202. However, in the third embodiment, the width of the slit 22e of the first rotor unit 201 is the same as the width of the slit 22f of the second rotor unit 202.

[0095] Since other structures are the same as those in Embodiment 1 or 2, their description is omitted here.

[0096] The third embodiment will be described in detail below.

[0097] like Fig.15 As shown in FIG. 1 , similarly to the first embodiment, the first rotor unit 201 is configured to include a pair of permanent magnets 21e, a gap 22e, and a pair of flux barriers 23e. Fig.16 As shown in FIG. 1 , the second rotor unit 202 is configured to include a pair of permanent magnets 21 f , a gap 22 f , and a pair of flux barriers 23 f .

[0098] As described above, in the third embodiment, the angle θm1 formed by the pair of magnetic flux barriers 23e of the first rotor unit 201 is different from the angle θm2 formed by the pair of magnetic flux barriers 23f of the second rotor unit 202. In addition, in the third embodiment, the arc angle θ1 of the gap 22e of the first rotor unit 201 is different from the arc angle θ2 of the gap 22f of the second rotor unit 202.

[0099] As a result, the magnetic paths of the magnetic flux passing through the outer circumference of the rotor 2 are different. Therefore, the magnetic flux from the stator 1 passes differently in each of the first rotor unit 201 and the second rotor unit 202. As a result, the pulsation of the generated torque ripple can be reduced.

[0100] As described above, in the third embodiment, the angle θm1 formed by the pair of magnetic flux barriers 23e of the first rotor unit 201 is different from the angle θm2 formed by the pair of magnetic flux barriers 23f of the second rotor unit 202. In addition, in the third embodiment, the arc angle θ1 of the gap 22e of the first rotor unit 201 is different from the arc angle θ2 of the gap 22f of the second rotor unit 202. Therefore, since the phase of the torque ripple generated in each rotor unit is different, when the rotor 2 is regarded as a whole, the torque ripple can be offset. As a result, the reduction in torque output can be suppressed and the torque ripple can be reduced.

[0101] Implementation method 4.

[0102] Fig.17 This is an exploded perspective view of the rotor 2 according to the fourth embodiment of the present invention. Fig.17 FIG. 2 shows a portion of one of the eight magnetic poles of the rotor 2. Fig.17 As shown, in the fourth embodiment, the rotor 2 is configured as a rotor unit having three stages. The other structures are the same as those of the first embodiment.

[0103] like Fig.17 As shown, among the three-stage rotor units, the rotor units of the first and third stages from the bottom have the same shape, and the rotor units of the first and second stages have different shapes. Specifically, for example, the rotor units of the first and third stages are constituted by the second rotor unit 202 shown in the above-mentioned embodiment 1, and the rotor units of the second stage are constituted by the first rotor unit 201 shown in the above-mentioned embodiment 1. In this way, the rotor units of multiple stages are constituted by two types of the first rotor unit 201 and the second rotor unit 202, and the first rotor unit 201 and the second rotor unit 202 are alternately stacked.

[0104] The phase of the generated torque fluctuation changes depending on the axial position of the rotating shaft of the rotor 2. Specifically, the phase of the torque fluctuation is opposite at both ends and the center of the rotating shaft of the rotor 2. Therefore, the rotor 2 is composed of three-stage rotor units, and only the second-stage rotor unit is set to a different structure, so that the mode of vibration generated in a manner that bends the rotating shaft X of the rotor 2 in a direction perpendicular to the rotating shaft X can be changed. Therefore, the rotor 2 is designed using the three-stage rotor unit in a manner that does not coincide with the mode of the resonant frequency of the rotor 2, so that vibration and noise can be reduced.

[0105] As described above, in the present embodiment 4, the rotor 2 is constituted by three-stage rotor units. In addition, the first rotor unit 201 and the second rotor unit 202 are alternately stacked. According to this, since the phase of the torque fluctuation generated in each rotor unit is different, when the rotor 2 is regarded as a whole, the torque fluctuation can be offset. Therefore, the torque fluctuation can be reduced. In addition, since the electromagnetic force generated in each rotor unit is different, when viewed in the height direction of the rotating shaft, the mode of the resonant frequency that deforms the rotating shaft X can be changed, and vibration and noise can be reduced.

[0106] In the fourth embodiment, an example of stacking three rotor units is described, but any number of rotor units may be stacked as long as the number is an odd number. In this case, the same effect can be obtained.

[0107] In addition, in the present fourth embodiment, the rotor unit of the second stage is set to a structure different from the rotor units of the first and third stages. In addition, without being limited to this case, the rotor unit of the third stage may be set to a structure different from the rotor units of the first and second stages, or the rotor unit of the first stage may be set to a structure different from the rotor units of the second and third stages. Further, the rotor units may be set to three types, and the rotor units of the first stage, the rotor units of the second stage, and the rotor units of the third stage may all be set to structures different from each other. As such, in the present fourth embodiment, it is sufficient to make at least one of the arc angle of the gap and the number of rows of the gaps between at least two rotor units different.

[0108] Implementation method 5.

[0109] Fig.18 This is an exploded perspective view of the rotor 2 according to the fifth embodiment of the present invention. Fig.18 FIG. 2 shows a portion of one of the eight magnetic poles of the rotor 2. Fig.18 As shown, in the fifth embodiment, the rotor 2 is configured as a rotor unit having four stages. The other configurations are the same as those of the first embodiment.

[0110] like Fig.18 As shown, among the four-stage rotor units, the rotor units of the first and third stages, counted from the bottom, are of the same shape, and the rotor units of the second and fourth stages are of the same shape. However, the shapes of the rotor units of the first and second stages are different. Specifically, for example, the rotor units of the first and third stages are constituted by the second rotor unit 202 shown in the above-mentioned embodiment 1, and the rotor units of the second and fourth stages are constituted by the first rotor unit 201 shown in the above-mentioned embodiment 1. In this way, the rotor units of multiple stages are constituted by two types, the first rotor unit 201 and the second rotor unit 202, so that the first rotor unit 201 and the second rotor unit 202 are alternately stacked.

[0111] The phase of the generated torque fluctuation changes depending on the axial position of the rotating shaft of the rotor 2. Specifically, the phase of the torque fluctuation is opposite at both ends and the center of the rotating shaft of the rotor 2. Therefore, the rotor 2 is composed of four-stage rotor units and only the second-stage and fourth-stage rotor units are set to different structures, so that the mode of vibration generated in a manner that bends the rotating shaft of the rotor 2 in a direction perpendicular to the rotating shaft can be changed. Therefore, the rotor 2 is designed using the four-stage rotor unit in a manner that does not coincide with the mode of the resonant frequency of the rotor 2, so that vibration and noise can be reduced.

[0112] As described above, in the fifth embodiment, the rotor 2 is composed of four-stage rotor units. In addition, the first rotor unit 201 and the second rotor unit 202 are alternately stacked. According to this, since the phase of the torque fluctuation generated in each rotor unit is different, when the rotor 2 is regarded as a whole, the torque fluctuation can be offset. Therefore, the torque fluctuation can be reduced. In addition, since the electromagnetic force generated in each rotor unit is different, when viewed in the height direction of the rotating shaft, the mode of the resonant frequency that deforms the rotating shaft X can be changed, and vibration and noise can be reduced.

[0113] In the fifth embodiment, an example of stacking rotor units in four stages is described, but any number of stages is acceptable as long as the number is an even number. In this case, the same effect can be obtained.

[0114] In addition, in the fifth embodiment, the case where the first rotor unit 201 and the second rotor unit 202 are alternately stacked is described. However, it is not limited to this case. For example, the first rotor unit 201, the second rotor unit 202, the second rotor unit 202 and the first rotor unit 201 can be stacked from the bottom. In addition, the rotor units can be set to three types, and the first rotor unit 201, the second rotor unit 202, the second rotor unit 202 and the third rotor unit can be stacked from the bottom. Or the first rotor unit 201, the first rotor unit 201, the second rotor unit 202 and the third rotor unit can be stacked from the bottom. Further, the rotor units can be set to four types, and all the rotor units from the first stage to the fourth stage are set to different structures from each other. In addition, the stacking order can be any order. As such, in the fifth embodiment, as long as at least one of the arc angle of the gap and the number of rows of the gap between at least two rotor units is different, it is sufficient.

[0115] Implementation method 6.

[0116] Fig.19 It is a diagram showing the cross-sectional shape of the first rotor unit 201 of the rotor 2 according to the sixth embodiment of the present invention. Fig.19A portion of one of the eight magnetic poles of the rotor 2 is shown. Fig.19 A cross section of the first rotor unit 201 along a plane perpendicular to the axial direction is shown.

[0117] Fig. 20 It is a diagram showing the cross-sectional shape of the second rotor unit 202 of the rotor 2 according to the sixth embodiment of the present invention. Fig. 20 A portion of one of the eight magnetic poles of the rotor 2 is shown. Fig. 20 A cross section of the second rotor unit 202 along a plane perpendicular to the axial direction is shown.

[0118] The difference between the above-mentioned third embodiment and the sixth embodiment will be described.

[0119] In the above-mentioned third embodiment, the gap 22e of the first rotor unit 201 and the gap 22f of the second rotor unit 202 are both linearly symmetrical shapes relative to the d-axis 60, but in this sixth embodiment, the gap 22g of the first rotor unit 201 and the gap 22h of the second rotor unit 202 are not linearly symmetrical shapes relative to the d-axis 60.

[0120] In addition, in the above-mentioned embodiment 3, the angle θm1 formed by a pair of magnetic flux barriers 23e of the first rotor unit 201 is different from the angle θm2 formed by a pair of magnetic flux barriers 23f of the second rotor unit 202, and the arc angle θ1 of the gap 22e of the first rotor unit 201 is different from the arc angle θ2 of the gap 22f of the second rotor unit 202.

[0121] In contrast, in the sixth embodiment, the angle θm formed by a pair of magnetic flux barriers 23g of the first rotor unit 201 is the same as the angle θm formed by a pair of magnetic flux barriers 23h of the second rotor unit 202, and the arc angle θ1 of the gap 22g of the first rotor unit 201 is the same as the arc angle θ2 of the gap 22h of the second rotor unit 202.

[0122] The other structures are the same as those of any of the first to fifth embodiments.

[0123] Implementation 6 is described in detail below.

[0124] like Fig.19 As shown in FIG. 1 , similarly to the first embodiment, the first rotor unit 201 is configured to include a pair of permanent magnets 21g, a gap 22g, and a pair of flux barriers 23g. Fig. 20 As shown in FIG. 1 , the second rotor unit 202 is configured to include a pair of permanent magnets 21 h , a gap 22 h , and a pair of flux barriers 23 h .

[0125] As described above, in the sixth embodiment, the gap 22g of the first rotor unit 201 is not line-symmetrical with respect to the d-axis 60. Therefore, in the following description, Fig.19 As shown, the arc angle of the gap 22g is divided into two parts with the d-axis as the boundary line, and the arc angle on the forward side of the rotation direction is called θ11, and the arc angle on the return side of the rotation direction is called θ12. Therefore, the arc angle of the gap 22g is θ11+θ12. At this time, the arc angle θ11 on the forward side of the rotation direction is different from the arc angle θ12 on the return side of the rotation direction.

[0126] Similarly, the gap 22h of the second rotor unit 202 is not line-symmetrical with respect to the d-axis 60. Therefore, in the following description, Fig. 20 As shown, the arc angle of the gap 22h is divided into two parts with the d-axis as the boundary line, and the arc angle on the forward side of the rotation direction is called θ21, and the arc angle on the return side of the rotation direction is called θ22. Therefore, the arc angle of the gap 22h is θ21+θ22. At this time, the arc angle θ21 on the forward side of the rotation direction is different from the arc angle θ22 on the return side of the rotation direction.

[0127] In addition, when comparing Fig.19 and Fig. 20 hour, Fig.19 The arc angle θ11 of the gap 22g shown in the rotation direction is Fig. 20 The arc angle θ21 of the rotation direction advancing side of the gap 22h shown is different. Fig.19 The arc angle θ12 of the rotation direction return side of the gap 22g shown is Fig. 20 The arc angle θ22 of the rotation direction return side of the slit 22h shown is different.

[0128] In this embodiment 6, for each rotor unit of the first rotor unit 201 and the second rotor unit 202, the arc angle of the gap 22g and the arc angle of the gap 22h are set to different angles, so that the phase of the torque fluctuation generated in the first rotor unit 201 and the phase of the torque fluctuation generated in the second rotor unit 202 can be changed.

[0129] In addition, in the sixth embodiment, in each of the first rotor unit 201 and the second rotor unit 202, the arc angle on the forward side of the rotation direction and the arc angle on the return side of the rotation direction are set to different angles, so that the current advance angle at which the reluctance torque is the peak value can be offset. Accordingly, the current advance angle at which the reluctance torque is the peak value can be made close to the current advance angle at which the magnet torque is the peak value. As a result, the maximum torque can be improved.

[0130] As described above, in the sixth embodiment, in the first rotor unit 201, the arc angle θ11 on the forward side of the rotation direction is different from the arc angle θ12 on the return side of the rotation direction, and in the second rotor unit 202, the arc angle θ21 on the forward side of the rotation direction is different from the arc angle θ22 on the return side of the rotation direction. Further, the arc angle θ11 on the forward side of the rotation direction of the first rotor unit 201 is different from the arc angle θ21 on the forward side of the rotation direction of the second rotor unit 202, and the arc angle θ12 on the return side of the rotation direction of the first rotor unit 201 is different from the arc angle θ22 on the return side of the rotation direction of the second rotor unit. Accordingly, since the phase of the torque fluctuation generated in each rotor unit is different, when the rotor 2 is regarded as a whole, the torque fluctuation can be offset. Furthermore, by changing the arc angle of the gap on the forward side of the rotation direction and the return side of the rotation direction, the phase of the magnetic flux can be biased toward the forward side of the rotation direction, and the phase of the magnetic resistance flux can be biased toward the return side of the rotation direction. As a result, the current advance angle at which the magnet torque becomes a peak and the current advance angle at which the reluctance torque becomes a peak can be made close to each other, and the output torque can be increased.

[0131] Implementation method 7.

[0132] Fig.21 To show the structure of the rotating electrical machine according to the seventh embodiment of the present invention Figure 1 The rotary electric machine 100A of the seventh embodiment includes a stator 41 and a rotor 42. In the seventh embodiment, a 12-pole 18-slot concentrated winding three-phase permanent magnet rotary electric machine is described as an example of the rotary electric machine 100A.

[0133] The overall structure of the rotating electrical machine 100A of the seventh embodiment is similar to Figure 1 They are basically the same, so their description is omitted here.

[0134] In addition, the structures of the stator 41 and the rotor 42 of the rotating electric machine 100A of the seventh embodiment are basically the same as the stator 1 and the rotor 2 described in the first embodiment, although the number of poles and the number of slots are different, so the description thereof is omitted here. However, in the above-mentioned first embodiment, the stator coil 12 is wound around each tooth 103 provided in the stator core 10 by a distributed winding method, while in the seventh embodiment, the stator coil 12 is wound around each tooth 103 provided in the stator core 10 by a concentrated winding method, which is different in this respect.

[0135] In the seventh embodiment, the rotor 42 is constituted by stacking two stages of rotor units in the axial direction, similarly to the first embodiment. Hereinafter, the first stage rotor unit is referred to as the first rotor unit 203 , and the second stage rotor unit is referred to as the second rotor unit 204 .

[0136] Fig. 22It is a diagram showing the cross-sectional shape of the first rotor unit 203 of the rotor 42 according to the seventh embodiment of the present invention. Fig. 22 One magnetic pole portion of the 12 magnetic poles of the rotor 42 is shown. Fig. 22 A cross section of the first rotor unit 203 along a plane perpendicular to the axial direction is shown.

[0137] Fig.23 It is a diagram showing the cross-sectional shape of the second rotor unit 204 of the rotor 42 according to the seventh embodiment of the present invention. Fig.23 One magnetic pole portion of the 12 magnetic poles of the rotor 42 is shown. Fig.23 A cross section of the second rotor unit 204 along a plane perpendicular to the axial direction is shown.

[0138] like Fig. 22 As shown, the first rotor unit 203 is configured to include a pair of permanent magnets 21i, a gap 22i provided between the pair of permanent magnets 21i, and a pair of flux barriers 23i. The pair of permanent magnets 21i are inserted and fixed in the magnet insertion holes 24i. The pair of permanent magnets 21i are arranged in a V-shape and are line-symmetrical with respect to the d-axis 60.

[0139] In the seventh embodiment, the slit 22i has a strip shape. Fig. 22 In the figure, a point on the side of the permanent magnet 21i arranged on the return side of the rotation direction in a pair of permanent magnets 21i is set as point P. A gap is set between point P and the permanent magnet 21i. Point P is arranged along one of the two sides in the long side direction of the permanent magnet 21i that is close to the outer peripheral side. In addition, a point on the outer peripheral side of the rotor 2 that is offset to the forward side in the rotation direction relative to point P is set as point Q. The gap 22i is formed along the straight line connecting point P and point Q. That is, the distance in the long side direction of the gap 22i is the same as the straight line distance between point P and point Q. At this time, the angle formed by the straight line 61 connecting point Q and the center O of the rotation axis and the d-axis 60 is called the deflection angle of the strip-shaped gap 22i, and is set as the deflection angle θ31. In addition, it is preferred that point P is arranged on the return side in the rotation direction relative to the d-axis 60, and point Q is arranged on the forward side in the rotation direction relative to the d-axis 60. In addition, as Fig. 22 As shown, when the distance from the intersection of one side of the permanent magnet 21i on the side where the point P is arranged and the straight line connecting the point Q and the point P to the end of the permanent magnet 21i is defined as a distance L, the distance L is appropriately set to an arbitrary value.

[0140] In this way, in the first rotor unit 203, by arranging the outer peripheral end of the gap 22i in a tilted manner in the rotation direction relative to the d-axis 60, the phase of the magnetic flux can be biased toward the forward side of the rotation direction, and the phase of the magnetic resistance flux can be biased toward the return side of the rotation direction. Accordingly, during power operation, the current advance angle at which the magnetic torque is a peak and the current advance angle at which the magnetic resistance torque is a peak can be made close to each other, resulting in an increase in torque.

[0141] In addition, if Fig.23 As shown, the second rotor unit 204 is configured to include a pair of permanent magnets 21j, a gap 22j provided between the pair of permanent magnets 21j, and a pair of flux barriers 23j. The pair of permanent magnets 21j are inserted and fixed in the magnet insertion holes 24j. The pair of permanent magnets 21j are arranged in a V-shape to be line-symmetrical with respect to the d-axis 60.

[0142] In the seventh embodiment, the slit 22j has a strip shape. Fig.23 In the figure, a point on the side of the permanent magnet 21j on the return side of the rotation direction among a pair of permanent magnets 21j is set as point P. A gap is provided between point P and the permanent magnet 21j. Point P is arranged along one of the two sides in the long side direction of the permanent magnet 21i that is close to the outer peripheral side. In addition, a point on the forward side in the rotation direction relative to point P and on the outer peripheral side of the rotor 2 is set as point Q. The gap 22j is formed along the straight line connecting point P and point Q. That is, the distance in the long side direction of the gap 22j is the same as the distance between point P and point Q. At this time, the angle formed by the straight line 61 connecting point Q and the center O of the rotation axis and the d-axis 60 is called the deflection angle of the strip-shaped gap 22j, and is set as the deflection angle θ32. In addition, it is preferred that point P is arranged on the return side in the rotation direction relative to the d-axis 60, and point Q is arranged on the forward side in the rotation direction relative to the d-axis 60. In addition, as Fig. 22 As shown in FIG. 1 , when the distance from the intersection of one side of the permanent magnet 21i on the side where the point P is arranged and the straight line connecting the point Q and the point P to the end of the permanent magnet 21i is set as the distance L, the distance L is appropriately set to an arbitrary value. Fig. 22 The deflection angle θ31 and Fig.23 The deflection angle θ32 is set to θ31≠θ32.

[0143] As described above, in the second rotor unit 204, the outer peripheral end of the slot 22j is arranged to be tilted in the rotation direction relative to the d-axis 60, so that the phase of the magnetic flux can be distributed toward the forward side of the rotation direction, and the phase of the magnetic resistance flux can be distributed toward the return side of the rotation direction. Accordingly, during power operation, the current advance angle at which the magnetic torque is a peak and the current advance angle at which the magnetic resistance torque is a peak can be made close to each other, resulting in an increase in torque.

[0144] In addition, as described above, in this embodiment 7, Fig. 22 The deflection angle θ31 and Fig.23 The deflection angle θ32 is set to θ31≠θ32. In this way, by setting the deflection angle θ31 of the gap 22i and the deflection angle θ32 of the gap 22j to different angles in each of the first rotor unit 203 and the second rotor unit 204, the magnetic path of the magnetic flux changes, and the amplitude and phase of the magnetic permeance harmonic of the rotor 42 change. Therefore, the phase of the torque ripple generated in the first rotor unit 203 and the phase of the torque ripple generated in the second rotor unit 204 can be changed. As a result, the torque ripple can be offset as the rotor 42 as a whole.

[0145] As described above, in the present embodiment 7, by making the outer peripheral end portions of the gaps 22i and 22j inclined toward the rotation direction, the phase of the magnetic flux can be biased toward the forward side of the rotation direction, and the phase of the magnetic resistance flux can be biased toward the return side of the rotation direction. Therefore, during power operation, the current advance angle at which the magnetic torque is the peak and the current advance angle at which the magnetic resistance torque is the peak can be made close to each other, and the output torque can be increased.

[0146] Furthermore, since the deflection angle θ31 of the gap 22i in the first rotor unit 203 and the deflection angle θ32 of the gap 22j in the second rotor unit 204 are set to different angles, the magnetic path of the magnetic flux changes, and the amplitude and phase of the magnetic permeance harmonic of the rotor 42 change. Therefore, since the phase of the torque ripple generated in the first rotor unit 203 and the phase of the torque ripple generated in the second rotor unit 204 can be changed, the torque ripple can be offset as the rotor 42 as a whole. As a result, the torque ripple can be reduced.

[0147] In the seventh embodiment, the number of rows of the slots 22i and 22j is set to 1, but the present invention is not limited to this case, and the number of rows of the slots 22i and 22j may be set to any value greater than 2. In addition, although the number of stages of the rotor unit is described as two, it may be set to any number. The rotor 42 is configured so that at least one of the deflection angle of the slots 22i and 22j having a strip shape and the number of rows of the slots 22i and 22j is different between the rotor units adjacent in the axial direction.

[0148] Implementation method 8.

[0149] Fig.241 is an exploded perspective view showing one pole of a rotor of a rotary electric machine according to an eighth embodiment of the present invention. The rotor includes a first rotor unit 401 and a second rotor unit 402. The first rotor unit 401 has three rows of magnetic slits 43a, and the second rotor unit 402 has two rows of magnetic slits 43b, each having a different cross-sectional shape. The magnetic slits 43a in the first rotor unit 401 have a symmetry axis 63 for each pole. In addition, the magnetic slits 43b in the second rotor unit 402 have a symmetry axis 64 for each pole.

[0150] In the first rotor unit 401, as Fig.24 As shown, the pair of magnets 44 a , the pair of magnet insertion holes 45 a , the flux barriers 46 a , and the magnetic slits 43 a are arranged line-symmetrically with respect to the symmetry axis 63 .

[0151] Similarly, in the second rotor unit 402, as Fig.24 As shown, the pair of magnets 44 b , the pair of magnet insertion holes 45 b , the flux barriers 46 b , and the magnetic slits 43 b are arranged line-symmetrically with respect to the symmetry axis 64 .

[0152] In the eighth embodiment, the first rotor unit 401 is arranged offset with respect to the second rotor unit 402 so that the symmetric axis 63 of the first rotor unit 401 is located at a position rotated counterclockwise by an angle δ [deg] with respect to the symmetric axis 64 of the second rotor unit 402 about the rotation axis of the rotor.

[0153] In this way, by rotating and shifting the first rotor unit 401 and the second rotor unit 402 to form a skewed rotor unit, the spatial phase of the magnetomotive force of the magnet itself can be shifted between the first rotor unit 401 and the second rotor unit 402. As a result, since the phases of the torque ripples generated in the first rotor unit 401 and the second rotor unit 402 can be shifted, the torque ripples can be reduced as a whole rotor.

[0154] In addition, this embodiment 8 is not limited to Fig.24 structure.

[0155] For example, it can be Fig.25 The structure shown. That is, Fig.25 As shown, when viewed from the height direction of the rotation axis, the position of the magnet 47a of the first rotor unit 403 and the position of the magnet 47b of the second rotor unit 404 can be the same. In this case, the symmetry axis of the magnetic gap 48a of the first rotor unit 403 is set as the symmetry axis 65, and the symmetry axis of the magnetic gap 48b of the second rotor unit 404 is set as the symmetry axis 66. At this time, the symmetry axis 65 is arranged at a position rotated counterclockwise by an angle δ [deg] with respect to the symmetry axis 66 with the rotation axis of the rotor as the center. That is, Fig.25In the embodiment, when viewed from the height direction of the rotation axis, the symmetry axis 65 is arranged at a position offset from the symmetry axis 66 rather than at the same position as the symmetry axis 66 .

[0156] Like this, Fig.25 As shown in the example, by setting the position of the magnet 47a of the first rotor unit 403 and the position of the magnet 47b of the second rotor unit 404 to be the same, the magnets 47a and 47b can be inserted into the first rotor unit 403 and the second rotor unit 404 from the rotation axis height direction during manufacturing. In addition, the leakage magnetic flux between the first rotor unit 403 and the second rotor unit 404 caused by the magnets 47a and 47b can also be reduced. In addition, the symmetry axis 65 of the magnetic gap 48a of the first rotor unit 403 and the symmetry axis 66 of the magnetic gap 48b of the second rotor unit 404 are offset by an angle δ [deg], so that the non-magnetic area can be unevenly distributed relative to the magnetic pole center. According to this, since the magnetic flux can be offset on the forward side and the return side in the rotation direction, the phase of the magnetic flux of the first rotor unit 403 and the second rotor unit 404 can be offset. As a result, the torque ripple caused by the magnetic flux can be reduced.

[0157] Furthermore, in the description of the above-mentioned Embodiment 8, Fig.24 and Fig.25 In the above description, the case where there are two rotor units is cited as an example, but the number of rotor units can be more than 3. In this case, each rotor unit can be arranged in such a way that the symmetry axis of the magnetic gap of at least one rotor unit in the multi-stage rotor unit is offset by a preset angle δ [deg] relative to the symmetry axis of the magnetic gap of the other rotor units in the rotation direction with the rotation axis as the axis center.

[0158] In addition, the angle δ [deg] is not particularly limited and may be appropriately set to any angle.

[0159] In addition, in the above-mentioned embodiments 1 to 8, the case where the gap 22 is hollow is cited as an example for explanation, but the present invention is not limited to this case. For example, the gap 22 may be filled with a resin or a heat dissipation material having a transmittance lower than the transmittance of the raw material constituting the first rotor unit 201 and the second rotor unit 202.

Claims

1. A rotating electrical machine comprising: a ring-shaped stator; and a rotor arranged inside the stator, in, The rotor has a plurality of rotor units stacked in the axial direction. Each of the multi-stage rotor units has a pair of permanent magnets and gaps arranged in one or more rows in the radial direction between the pair of permanent magnets. The shape of the pair of permanent magnets arranged in each of the multi-stage rotor units is the same in each of the multi-stage rotor units. The slot has an arc shape that is convex and curved toward the inner diameter and extends in the circumferential direction, and the opening of the slot faces the inner circumferential surface of the stator. When the angle formed by two straight lines connecting the positions of the two ends of the arc shape and the center of the rotation axis of the rotor is set as the arc angle of the gap, The arc angle of the gap is different between at least two rotor units, so that the magnetic path of the reluctance flux is different between at least two rotor units.

2. The rotating electrical machine according to claim 1, wherein: Positions of the pair of permanent magnets disposed in each of the rotor units of the multi-stage rotor units are the same in all of the rotor units of the multi-stage rotor units.

3. The rotating electrical machine according to claim 1 or 2, wherein: The shapes and positions of the magnet insertion holes, into which the pair of permanent magnets arranged in the respective rotor units of the multi-stage rotor units are inserted, are the same in all the rotor units of the multi-stage rotor units.

4. The rotating electrical machine according to claim 1 or 2, wherein: The positions of the ends of the slits arranged in the respective rotor units of the multi-stage rotor units are different between the rotor units.

5. The rotating electrical machine according to claim 1 or 2, wherein: Each of the gaps is formed so as to pass through a center line of a magnetic pole formed by a pair of permanent magnets.

6. The rotating electrical machine according to claim 1 or 2, wherein: Widths of at least two ends of the gap are different between at least two rotor units.

7. The rotating electrical machine according to claim 1 or 2, wherein: Each rotor unit of the multi-stage rotor unit further comprises: a pair of magnet insertion holes into which the pair of permanent magnets are inserted; and A pair of flux barriers are provided in connection with the pair of magnet insertion holes, When the angle formed by two straight lines respectively connecting the outer peripheral end portions of the pair of magnetic flux barriers and the center of the rotation axis is set as the angle formed by the pair of magnetic flux barriers, The angle formed by the pair of flux barriers is different between at least two rotor units.

8. The rotating electrical machine according to claim 1 or 2, wherein: The symmetric axis of the gap of at least one rotor unit among the multi-stage rotor units is arranged to be offset in a rotation direction around the rotation axis of the rotor with respect to the symmetric axis of the gap of the other rotor units.

9. The rotating electrical machine according to claim 7, wherein: The shapes and positions of the pair of magnet insertion holes are the same between the rotor units of the multiple stages.

10. The rotating electrical machine according to claim 1 or 2, wherein: The number of stages of the multi-stage rotor unit is 3 or more.

11. The rotating electrical machine according to claim 1 or 2, wherein: The multi-stage rotor unit includes two types: a first rotor unit and a second rotor unit. The first rotor units and the second rotor units are alternately stacked.

12. The rotating electrical machine according to claim 1 or 2, wherein: When the arc angle of the gap is divided into two parts from the center line of the magnetic pole formed by the pair of permanent magnets, one part is set as the arc angle of the forward side in the rotation direction, and the other part is set as the arc angle of the return side in the rotation direction, In each of the multi-stage rotor units, an arc angle on the forward side of the rotation direction and an arc angle on the return side of the rotation direction are different from each other. The arc angle of the forward side of the rotation direction is different between at least two rotor units, The arc angle of the rotation direction return side is different between at least two rotor units.

13. The rotating electric machine according to claim 1, wherein: The number of rows of the slots is different between at least two rotor units, so that the magnetic path of the reluctance flux is different between at least two rotor units, wherein the number of rows of the slots is the number of rows of slots arranged in the radial direction between the pair of permanent magnets.

14. A rotating electrical machine comprising: a ring-shaped stator; and a rotor arranged inside the stator, in, The rotor has a plurality of rotor units stacked in the axial direction. Each of the multi-stage rotor units has a pair of permanent magnets and gaps arranged in one or more rows in the radial direction between the pair of permanent magnets. The shape of the pair of permanent magnets arranged in each of the multi-stage rotor units is the same in each of the multi-stage rotor units. The slot has an arc shape that is convex and curved toward the inner diameter and extends in the circumferential direction, and the opening of the slot faces the inner circumferential surface of the stator. When the angle formed by two straight lines connecting the positions of the two ends of the arc shape and the center of the rotation axis of the rotor is set as the arc angle of the gap, At least one of the arc angle of the slot and the number of slot rows is different between at least two rotor units, so that the magnetic path of the magnetic reluctance flux is different between at least two rotor units. Each rotor unit of the multi-stage rotor unit further comprises: a pair of magnet insertion holes into which the pair of permanent magnets are inserted; and A pair of flux barriers are provided in connection with the pair of magnet insertion holes, When the angle formed by two straight lines respectively connecting the outer peripheral end portions of the pair of magnetic flux barriers and the center of the rotation axis is set as the angle formed by the pair of magnetic flux barriers, The angle formed by the pair of flux barriers is different between at least two rotor units.

15. A rotating electrical machine comprising: a ring-shaped stator; and a rotor arranged inside the stator, in, The rotor has a plurality of rotor units stacked in the axial direction. Each of the multi-stage rotor units has a pair of permanent magnets and gaps arranged in one or more rows in the radial direction between the pair of permanent magnets. The shape of the pair of permanent magnets arranged in each of the multi-stage rotor units is the same in each of the multi-stage rotor units. The slot has an arc shape that is convex and curved toward the inner diameter and extends in the circumferential direction, and the opening of the slot faces the inner circumferential surface of the stator. When the angle formed by two straight lines connecting the positions of the two ends of the arc shape and the center of the rotation axis of the rotor is set as the arc angle of the gap, At least one of the arc angle of the slot and the number of slot rows is different between at least two rotor units, so that the magnetic path of the magnetic reluctance flux is different between at least two rotor units. When the arc angle of the gap is divided into two parts from the center line of the magnetic pole formed by the pair of permanent magnets, one part is set as the arc angle of the forward side in the rotation direction, and the other part is set as the arc angle of the return side in the rotation direction, In each of the multi-stage rotor units, an arc angle on the forward side of the rotation direction and an arc angle on the return side of the rotation direction are different from each other. The arc angle of the forward side of the rotation direction is different between at least two rotor units, The arc angle of the rotation direction return side is different between at least two rotor units.

16. A rotating electrical machine comprising: a ring-shaped stator; and a rotor arranged inside the stator, in, The rotor has a plurality of rotor units stacked in the axial direction. Each of the multi-stage rotor units has a pair of permanent magnets and one or more strip-shaped gaps disposed between the pair of permanent magnets and extending linearly. The shape of the pair of permanent magnets arranged in each of the multi-stage rotor units is the same in each of the multi-stage rotor units. The first end of the strip-shaped gap is arranged on the side of the permanent magnet of the pair of permanent magnets that is arranged on the return side in the rotation direction. The second end of the strip-shaped slit is offset toward the forward side in the rotation direction compared to the first end, and is arranged on the outer peripheral side of the rotor. When the angle formed by the straight line connecting the second end and the center of the rotation axis of the rotor and the center line of the magnetic pole formed by the pair of permanent magnets is defined as the deflection angle of the gap, The deflection angle of the strip-shaped gap is different between at least two rotor units, so that the magnetic path of the reluctance flux is different between at least two rotor units.

17. The rotating electrical machine according to claim 16, wherein: The number of rows of the slots is different between at least two rotor units, so that the magnetic path of the reluctance flux is different between at least two rotor units, wherein the number of rows of the slots is the number of rows of the slots in a band shape provided between the pair of permanent magnets.

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