Rotor for rotating electric machines

Abstract

Disclosed is a rotor for a rotary electric machine, the rotor including: a rotor core; a first permanent magnet in a first magnet hole; and a second permanent magnet in a second magnet hole. In the first magnet hole, on one side in a circumferential direction with respect to a d-axis, a first hole portion on a side closer to the d-axis and a second hole portion on a side farther from the d-axis protrude inward in a core radial direction when viewed in the axial direction, and first hole portions on both sides in the circumferential direction with respect to the d-axis protrude outward in the core radial direction, with the d-axis as the center, when viewed in the axial direction. The first permanent magnet extends in at least part of each of the first hole portion and the second hole portion of the first magnet hole.

Description

Technical Field

[0001] The present disclosure relates to a rotor for a rotating electrical machine.

Background Art

[0002] A two-layer arrangement structure in which a plurality of permanent magnets are arranged in two layers in a rotor core is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the case of such a two-layer arrangement structure (the same applies to a multi-layer arrangement structure of three layers or more), in order to cope with an increase in centrifugal force accompanying a high-speed rotation of the rotating electrical machine, the magnet holes related to the radially outer layer may be formed in a convex shape radially outward around the d-axis when viewed axially. However, in such a configuration, due to such a convex shape radially outward, on the side far from the d-axis (the outer peripheral side of the rotor core), the distance (the width of the bridge) between the magnet hole and the outer peripheral surface of the rotor core becomes large, and leakage magnetic flux is likely to become a problem. On the other hand, in order to narrow the width of such a bridge, it is also possible to take measures to extend the magnet hole toward the outer peripheral surface (measures to expand the flux barrier portion), but in such measures, the volume of the void portion other than the permanent magnet is likely to become relatively large.

[0005] Therefore, on one side, an object of the present disclosure is to enable high-speed rotation of a rotating electrical machine while reducing leakage magnetic flux and increasing the occupancy rate of permanent magnets in magnet holes.

Means for Solving the Problems

[0006] In one aspect, the rotor core is formed such that the first magnet hole is formed symmetrically with respect to the d-axis when viewed in the axial direction, and the second magnet hole, which includes two or more hole portions in a manner that is continuous in the circumferential direction, is formed symmetrically with respect to the d-axis when viewed in the axial direction. A first permanent magnet is placed in the first magnet hole, The invention includes a second permanent magnet disposed within the second magnet hole, The rotor core includes a first portion located radially outward from the first magnet hole and forming the outer circumferential surface of the rotor core, a second portion extending circumferentially from the first magnet hole to the outer circumferential surface of the rotor core through the space between the first magnet hole and the second magnet hole, and a third portion extending circumferentially from the second magnet hole to the outer circumferential surface of the rotor core. The first magnet hole, on one side in the circumferential direction with respect to the d-axis, has a first hole portion on the side closer to the d-axis and a second hole portion on the side further from the d-axis, which, when viewed in the axial direction, have a convex shape toward the second portion, and the first hole portions on both sides in the circumferential direction with respect to the d-axis, when viewed in the axial direction, have a convex shape toward the first portion with respect to the d-axis as the center. A rotor for a rotating electric machine is provided, wherein the first permanent magnet extends into at least a portion of the first and second hole portions of the first magnet hole. [Effects of the Invention]

[0007] In one respect, this disclosure enables higher rotational speeds for rotating electric machines while reducing leakage flux and increasing the occupancy rate of permanent magnets in magnet holes. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic cross-sectional view showing the cross-sectional structure of a motor according to one embodiment. [Figure 2] This is a cross-sectional view of the rotor. [Figure 3] This is an enlarged view of the portion related to one of the magnetic poles shown in Figure 2. [Figure 3A] This is an explanatory diagram of a modified example (part 1) of the configuration shown in Figure 3. [Figure 3B]This is an explanatory diagram of a modified example (part 2) of the configuration shown in Figure 3. [Figure 4] Figure 3 shows lines illustrating the shape characteristics. [Figure 5] This is a diagram showing the configuration of the first comparative example. [Figure 6] This figure shows the configuration of the second comparative example. [Figure 7] This is an explanatory diagram of the effects of this embodiment. [Modes for carrying out the invention]

[0009] The following describes each embodiment in detail with reference to the attached drawings. Note that the dimensional ratios in the drawings are merely examples and are not exhaustive. Furthermore, some shapes and other details in the drawings may be exaggerated for illustrative purposes.

[0010] Figure 1 is a schematic cross-sectional view showing the cross-sectional structure of motor 1 according to one embodiment. Figure 2 is a cross-sectional view of rotor 30 (a cross-sectional view taken from a plane perpendicular to the axial direction). Note that in Figure 2 and other figures, for ease of viewing, only some of the parts with the same attribute that exist in multiple locations may be assigned reference numerals.

[0011] Figure 1 shows the rotation axis 12 of motor 1. In the following explanation, axial direction refers to the direction in which the rotation axis (center of rotation) 12 of motor 1 extends, and radial direction refers to the radial direction centered on the rotation axis 12. Therefore, radially outward refers to the side away from the rotation axis 12, and radially inward refers to the side toward the rotation axis 12. Furthermore, circumferential direction corresponds to the direction of rotation around the rotation axis 12.

[0012] Motor 1 may be, for example, a vehicle drive motor used in hybrid vehicles or electric vehicles. However, Motor 1 may be used for any other purpose.

[0013] The motor 1 is of the inner rotor type, and the stator 21 is provided so as to surround the outer side in the radial direction of the rotor 30. The outer side in the radial direction of the stator 21 is fixed to the motor housing 10. The stator 21 includes a stator core 211 made of, for example, a laminated steel sheet of an annular magnetic material. A plurality of slots (not shown) around which coils 22 are wound are formed on the inner side in the radial direction of the stator core 211.

[0014] The rotor 30 is arranged on the inner side in the radial direction of the stator 21.

[0015] The rotor 30 includes a rotor core 32, a rotor shaft 34, end plates 35A and 35B, and permanent magnets 61 and 62.

[0016] The rotor core 32 is fixed to the surface on the outer side in the radial direction of the rotor shaft 34 and rotates integrally with the rotor shaft 34. The rotor core 32 has a shaft hole 320 (see FIG. 2), and the rotor shaft 34 is fitted into the shaft hole 320. The rotor core 32 may be fixed to the rotor shaft 34 by shrink fitting, press fitting, or the like. For example, the rotor core 32 may be coupled to the rotor shaft 34 by a key connection or a spline connection. The rotor shaft 34 is rotatably supported by the motor housing 10 via bearings 14a and 14b. Note that the rotor shaft 34 defines the rotation axis 12 of the motor 1.

[0017] The rotor core 32 is formed of, for example, a laminated steel sheet of an annular magnetic material. Permanent magnets 61 and 62 (see FIG. 2) are embedded inside the rotor core 32. That is, the rotor core 32 has magnet holes 321 and 322 (see FIG. 2) penetrating in the axial direction, and the permanent magnets 61 and 62 are inserted and fixed into the magnet holes 321 and 322. In a modified example, the rotor core 32 may be formed of a compacted body in which magnetic powder is compressed and solidified.

[0018] The rotor core 32 has an annular shape when viewed in the axial direction, and the outer circumferential surface 328 of the rotor core 32 includes a portion having a constant outer diameter. In modified examples, the circular shape of the rotor core 32 does not need to be a perfect circle; for example, it may be a circular shape with a notch (e.g., a welding groove) in part.

[0019] As shown in Figure 2, the rotor core 32 has a rotationally symmetrical configuration with respect to the rotation axis 12 when viewed in the axial direction. In the example shown in Figure 2, the rotor core 32 is configured such that each pair of permanent magnets 61 and 62 overlaps every 45 degrees of rotation around the rotation axis 12.

[0020] Multiple permanent magnets 61, 62 may be formed from neodymium or the like. Multiple permanent magnets 61, 62 may be sintered magnets, or they may be formed from a bonded magnet material (hereinafter also simply referred to as "bonded magnet material") which is a mixture of magnetic powder and a binder. In this embodiment, as an example, as shown in Figure 2, the multiple permanent magnets 61, 62 are arranged in pairs when viewed in the axial direction. In this case, a common magnetic pole is formed between the pair of permanent magnets 61 and between the pair of permanent magnets 62. The multiple permanent magnets 61, 62 are arranged in such a manner that south poles and north poles appear alternately in the circumferential direction. In this embodiment, there are eight magnetic poles, but the number of magnetic poles is arbitrary.

[0021] Although Figure 1 shows a motor 1 with a specific structure, the structure of the motor 1 is not limited to this specific structure. For example, in Figure 1, the rotor shaft 34 is hollow, but it may be solid.

[0022] Next, the rotor core 32 and permanent magnets 61 and 62 will be described in more detail with reference to Figure 3 and subsequent figures. The following description will focus on the configuration for one magnetic pole, but the configuration for other magnetic poles may be similar.

[0023] Figure 3 is an enlarged view of the portion related to one of the magnetic poles shown in Figure 2. The configuration related to one of the magnetic poles is basically symmetrical with respect to the d-axis (referred to as "d-axis" in Figure 3), which corresponds to the direction of the principal magnetic flux (direction of the field pole). Hereafter, the side farther from the d-axis refers to the side away from the d-axis, and the side closer to the d-axis refers to the side approaching the d-axis. Also, both sides in the circumferential direction of the d-axis refer to both sides in the circumferential direction with respect to the d-axis as the center.

[0024] The rotor core 32 has a radially outer magnet hole 321 (hereinafter referred to as the "first magnet hole 321") and a radially inner magnet hole 322 (hereinafter referred to as the "second magnet hole 322").

[0025] The first magnet hole 321 is formed by two hole portions in pairs on both sides of the circumferential direction of the d-axis. However, in a modified example, the first magnet hole 321 may have a hole portion on the d-axis and hole portions separated on both sides of the circumferential direction of the d-axis. Alternatively, the first magnet hole 321 may be formed by a collection of many small hole portions. In this case, the form of the first magnet hole 321 corresponds to the form or arrangement of the collection of many small hole portions as a whole. A permanent magnet 61 is provided in each hole portion of the first magnet hole 321. Furthermore, multiple permanent magnets 61 may be arranged in one hole portion of the first magnet hole 321. For example, as shown in the rotor 30A in Figure 3A, two permanent magnets 61A may be arranged in one hole portion of the first magnet hole 321, or as shown in the rotor 30B in Figure 3B, four permanent magnets 61B may be arranged in one hole portion of the first magnet hole 321. In either case, within one portion of the first magnet hole 321, the multiple permanent magnets 61A or 61B may be arranged spaced apart from each other as shown in the figure, or they may be arranged in contact, although this differs from the figure. Furthermore, as shown in the rotor 30A in Figure 3A and the rotor 30B in Figure 3B, within one portion of the first magnet hole 321, the multiple permanent magnets 61A or 61B may not extend to both ends in the circumferential direction of the single hole portion, and non-magnetic portions (e.g., cavities) may be formed at both ends in the circumferential direction of the single hole portion. Alternatively, although this differs from the figure, the multiple permanent magnets 61A or 61B may extend to both ends in the circumferential direction of the single hole portion within one portion of the first magnet hole 321.

[0026] The second magnet hole 322 is located radially inward from the first magnet hole 321. The second magnet hole 322 is formed in a manner that is symmetrical with respect to the d-axis, similar to the first magnet hole 321. The second magnet holes 322 on both sides of the d-axis in the circumferential direction have a wider circumferential extension range than the first magnet holes 321 on both sides of the d-axis in the circumferential direction.

[0027] In this embodiment, the second magnet hole 322 includes a total of four hole portions, each formed in pairs on both sides of the circumferential direction of the d-axis. That is, the second magnet hole 322 has two hole portions formed on one side of the d-axis in the circumferential direction, and two hole portions formed on the other side of the d-axis in the circumferential direction. In this way, in this embodiment, a total of four hole portions form the second magnet hole 322 for one magnetic pole. However, in a modified example, the second magnet hole 322 may consist of a hole portion on the d-axis and two hole portions located in pairs on both sides of the circumferential direction of the d-axis. Alternatively, the second magnet hole 322 may be formed by a collection of a larger number of smaller hole portions. In either case, the form of the second magnet hole 322 corresponds to the form or arrangement of the collection of multiple hole portions as a whole. A permanent magnet 62 is provided in each hole portion of the second magnet hole 322. In this case, a gap may be provided between the second magnet hole 322 and the permanent magnet 62 at both longitudinal ends of the permanent magnet 62. This gap may be hollow or filled with resin or the like. Furthermore, multiple permanent magnets 62 may be placed in one portion of the second magnet hole 322.

[0028] The rotor core 32 has such a first magnet hole 321 and a second magnet hole 322, and has three parts 3211, 3212, and 3213 (hereinafter also referred to as the first part 3211, the second part 3212, and the third part 3213) that are connected only radially via a bridge.

[0029] Specifically, the first portion 3211 extends radially outward from the first magnet hole 321. The first portion 3211 forms part of the outer circumferential surface 328 of the rotor core 32.

[0030] The second portion 3212 extends circumferentially from the second magnet hole 322 to the outer circumferential surface 328 of the rotor core 32, passing between the second magnet hole 322 and the first magnet hole 321. On both circumferential sides of the first portion 3212, the second portion 3212 forms a part of the outer circumferential surface 328 of the rotor core 32. The second portion 3212 forms a magnetic path for the q-axis magnetic flux. Specifically, the q-axis magnetic flux flows from one end of the second portion 3212 to the other, passing between the second magnet hole 322 and the first magnet hole 321 (see arrow M5 schematically shown in Figure 4).

[0031] The third portion 3213 extends radially inward from the second magnet hole 322, with both sides extending circumferentially to the outer circumferential surface 328 of the rotor core 32. On both sides circumferentially of the second portion 3212, the third portion 3213 forms a part of the outer circumferential surface 328 of the rotor core 32.

[0032] In this embodiment, the mass of the third part 3213 is significantly larger than the mass of the second part 3212, and the mass of the second part 3212 is significantly larger than the mass of the first part 3211.

[0033] Furthermore, the rotor core 32, having these three parts 3211, 3212, and 3213, has multiple bridges 41, 42, 43, 44, and 45 connecting the three parts 3211, 3212, and 3213.

[0034] The bridge 41 (hereinafter referred to as "first bridge 41") supports the first portion 3211 radially outward relative to the second portion 3212. That is, the first bridge 41 connects the second portion 3212 and the first portion 3211 and extends in the circumferential direction. The first bridge 41 is provided in pairs on both sides of the first portion 3211 in the circumferential direction.

[0035] The bridge 42 (hereinafter referred to as the "second bridge 42") supports the second portion 3212 radially outward from the third portion 3213. That is, the second bridge 42 connects the third portion 3213 and the second portion 3212 and extends in the circumferential direction. The second bridge 42 is provided in pairs on both sides of the second portion 3212 in the circumferential direction.

[0036] Bridge 43 supports the first portion 3211 relative to the second portion 3212, radially inward from the first bridge 41.

[0037] The bridge 44 (hereinafter referred to as "center bridge 44") supports the second portion 3212 on the d axis with respect to the third portion 3213.

[0038] The bridge 45 (hereinafter referred to as the "intermediate bridge 45") supports the second portion 3212 with respect to the third portion 3213, radially outward (farther from the d-axis) than the center bridge 44 and radially inward than the second bridge 42.

[0039] Next, with reference to Figures 4 and onward, further characteristic configurations of this embodiment will be described. Figure 4 is a diagram illustrating the lines used to explain the shape features in Figure 3. Figure 5 shows the configuration of the first comparative example, Figure 6 shows the configuration of the second comparative example, and Figure 7 is a diagram illustrating some of the effects of this embodiment in comparison with the first and second comparative examples. Figures 5 to 7 schematically show the flow of magnetic flux (magnetic flux due to magnetic poles) in each case, indicated by R5 to R7.

[0040] In the following descriptions, unless otherwise specified, the various arrangements and forms refer to the arrangement or form viewed along the axis.

[0041] In this embodiment, the first magnet hole 321 has a W-shape centered on the d-axis. Specifically, the hole portion 321-1 (hereinafter also referred to as "first hole portion 321-1") on the side closer to the d-axis has a convex shape extending radially outward with respect to the d-axis, while the hole portion 321-2 (hereinafter also referred to as "second hole portion 321-2") on the side further from the d-axis, in combination with the first hole portion 321-1 on one side of the d-axis, has a convex shape extending radially inward.

[0042] According to this embodiment, since the first magnet hole 321 has a W-shape, the mass of the first part 3211 can be efficiently reduced compared to the case where it is not. This effectively reduces the stress in each bridge 41, 43 caused by centrifugal force.

[0043] Furthermore, if the first hole portion 321-1 of the first magnet hole 321 has a convex shape that extends radially outward with respect to the d-axis, then, as shown in Figure 4, the angle β between the shape center line L5 of the portion closer to the d-axis and the d-axis becomes acute radially inward.

[0044] In this embodiment, the permanent magnets 61 are placed in the first hole portion 321-1 and the second hole portion 321-2 of the first magnet hole 321. In this case, the permanent magnets 61 may be placed in a part of the first hole portion 321-1 and the second hole portion 321-2, or they may be placed in the entirety of one of the first hole portion 321-1 and the second hole portion 321-2 and in a part of the other. In this embodiment, as an example, the permanent magnets 61 are placed in the entirety of the first hole portion 321-1 and the second hole portion 321-2, as shown in Figure 4.

[0045] In this case, the permanent magnet 61 may be formed from a bonded magnet material. When the permanent magnet 61 is formed from a bonded magnet material, it is also possible to fill (place) the permanent magnet 61 without any gaps in the first magnet hole 321. Alternatively, the permanent magnet 61 may be formed from a combination of a magnet portion and a sintered magnet made from a bonded magnet material. In this case, the sintered magnet may be placed in the first hole portion 321-1, which has a relatively rectangular shape, and the magnet portion related to the bonded magnet material may be placed in the second hole portion 321-2, which may have a relatively complex shape. In other words, by using a bonded magnet material, the permanent magnet 61 can be formed even in spaces that were previously used as flux barriers (especially spaces with shapes that make it difficult to insert a sintered magnet when viewed in the axial direction).

[0046] With this arrangement of permanent magnets 61, the portion of the permanent magnet 61 positioned in the second hole portion 321-2 is closer to the outer circumferential surface 328 of the rotor core 32 than the portion positioned in the first hole portion 321-1 (in terms of radial distance or shortest distance). This makes it possible to increase the occupancy rate of the permanent magnets 61 in the first magnet hole 321 while minimizing leakage flux through the first bridge 41, as will be described later.

[0047] In this embodiment, the second magnet hole 322 has a W-shape centered on the d-axis. Specifically, the portion of the second magnet hole 322 closer to the d-axis has a convex shape extending radially outward around the d-axis, while the portion further from the d-axis, in combination with the portion closer to the d-axis, has a convex shape extending radially inward. In this embodiment, the portion closer to the d-axis corresponds to the hole portions 322-1 on both sides in the circumferential direction, with the center bridge 44 in between, and the portion further from the d-axis corresponds to the hole portions 322-2 on both sides in the circumferential direction, with the intermediate bridge 45 in between.

[0048] Furthermore, if the portion of the second magnet hole 322 closest to the d-axis has a convex shape extending radially outward with respect to the d-axis, then, as shown in Figure 4, the angle α between the shape center line L4 of the portion closest to the d-axis and the d-axis becomes an acute angle radially inward. Note that, if the portion of the second magnet hole 322 closest to the d-axis has the shape of a circular arc, as shown in Figure 4, the shape center line L4 may be tangential to the d-axis side end (the end closest to the d-axis) of the arc.

[0049] In this embodiment, the permanent magnet 62 may be placed throughout the entire second magnet hole 322, or it may be placed in a part of the second magnet hole 322.

[0050] In this embodiment, as shown in Figure 4, the radially inward convex shape of the second magnet hole 322 has a curved portion (see R41, R42) with its center of curvature on the d-axis side (radially outward). In the example shown in Figure 4, the second magnet hole 322 has curved portions (see R41, R42) on both sides of the intermediate bridge 45, but it is also possible that only one side has a curved portion (R41 or R42). Furthermore, the entire second magnet hole 322 does not need to be a curved portion; for example, only the portion close to the intermediate bridge 45 may be curved. Also, the radius of curvature of the curved portion may be constant or may vary within a single curved portion.

[0051] Furthermore, the radially inward convex shape of the first magnet hole 321 may also have a curved portion with its center of curvature on the d-axis side (radially outward).

[0052] According to this embodiment, since the second magnet hole 322 has a W-shape together with the first magnet hole 321, the mass of the first part 3211 and the second part 3212 can be efficiently reduced. This effectively reduces the stress in each bridge (bridges 41, 42, 43, 44, 45) caused by centrifugal force.

[0053] Here, the rotor 32" of the first comparative example shown in Figure 5 differs from this embodiment in that the first magnet hole 321 is replaced by the first magnet hole 321"". The first magnet hole 321" differs from the first magnet hole 321 in this embodiment in that it does not have a portion corresponding to the second hole portion 321-2. The permanent magnet 61" has a form corresponding to the first magnet hole 321". In this case, the first portion 3211" is supported by a relatively large bridge 41". As schematically shown by arrow R5 in Figure 5, there is a problem that the leakage flux through the bridge 41" becomes significantly larger.

[0054] In the rotor 32' of the second comparative example shown in Figure 6, the permanent magnet 61 is replaced with a permanent magnet 61', which is different from the present embodiment. The permanent magnet 61' differs from the permanent magnet 61 in the present embodiment in that it is not placed in the second hole portion 321-2. That is, in the second comparative example, the second hole portion 321-2 functions as a flux barrier. In such a second comparative example, the volume of the void portion other than the permanent magnet 61' in the first magnet hole 321 tends to be relatively large.

[0055] In contrast, in this embodiment, as described above, the permanent magnet 61 is provided throughout the entire W-shaped first magnet hole 321, so that leakage flux can be reduced and the occupancy rate of the permanent magnet 61 in the magnet hole 321 can be increased. That is, in this embodiment, by extending the magnet hole 321 to the part where a relatively large amount of leakage flux occurs in the first comparative example, the leakage flux can be reduced. Furthermore, in this embodiment, by extending the permanent magnet 61 to the air gap portion used as a flux barrier in the second comparative example, the occupancy rate of the permanent magnet 61 in the magnet hole 321 can be increased. As a result, in this embodiment, as schematically shown by arrow R7 in Figure 7, the magnetic flux related to the permanent magnet 61 can be increased compared to the case of the second comparative example schematically shown by arrow R6 in Figure 6, and the torque characteristics of the motor 1 can be improved.

[0056] In particular, according to this embodiment, by extending the permanent magnet 61 throughout the entire gap portion used as a flux barrier (i.e., the entire second hole portion 321-2), the magnetic flux related to the permanent magnet 61 can be maximized.

[0057] Although each embodiment has been described in detail above, the invention is not limited to any particular embodiment, and various modifications and changes are possible within the scope described in the claims. Furthermore, it is possible to combine all or more of the components of the embodiments described above. For example, in the above-described embodiment 1 (and similarly in other embodiments), the first magnet hole 321 includes two or more hole portions that are connected circumferentially in a manner symmetrical with respect to the d-axis when viewed in the axial direction, but the first magnet hole 321 may be formed by a single hole portion. [Explanation of Symbols]

[0058] 30...Rotor (rotor for rotating electric machine), 32...Rotor core, 3211...First part, 3212...Second part, 3213...Third part, 321...First magnet hole, 321-1...First hole section, 321-2...Second hole section, 322...Second magnet hole, 61...Permanent magnet (first permanent magnet), 62...Permanent magnet (second permanent magnet)

Claims

1. A rotor core in which a first magnet hole is formed symmetrically with respect to the d-axis when viewed in the axial direction, and a second magnet hole including two or more hole portions is formed symmetrically with respect to the d-axis when viewed in the axial direction, in a manner that is continuous in the circumferential direction, A first permanent magnet is placed in the first magnet hole, The system includes a second permanent magnet disposed within the second magnet hole, The rotor core includes a first portion located radially outward from the first magnet hole and forming the outer circumferential surface of the rotor core, a second portion extending circumferentially from the first magnet hole to the outer circumferential surface of the rotor core through the space between the first magnet hole and the second magnet hole, and a third portion extending circumferentially from the second magnet hole to the outer circumferential surface of the rotor core. The first magnet hole, on one side in the circumferential direction with respect to the d-axis, has a first hole portion on the side closer to the d-axis and a second hole portion on the side further from the d-axis, which, when viewed in the axial direction, have a convex shape toward the second portion, and the first hole portions on both sides in the circumferential direction with respect to the d-axis, when viewed in the axial direction, have a convex shape toward the first portion with respect to the d-axis as the center. The first permanent magnet extends into at least a portion of the first and second hole portions of the first magnet hole, and is a rotor for a rotating electric machine.

2. The first hole portion and the second hole portion are continuous. The rotor for a rotating electric machine according to claim 1, wherein the first permanent magnet extends over the entire second bore portion.

3. The rotor for a rotating electric machine according to claim 1, wherein the magnetic portion of the first permanent magnet within the second hole is closer to the outer surface of the rotor core in the axial direction than the magnetic portion of the first permanent magnet within the first hole.

4. The rotor for a rotating electric machine according to any one of claims 1 to 3, wherein the portion of the second magnet hole that extends circumferentially on both sides of the d-axis, either straddling or passing through the d-axis, has a convex shape toward the second portion side with respect to the d-axis when viewed in the axial direction.

5. Rotor for a rotating electric machine according to claim 4, wherein at least the magnetic portion of the first permanent magnet extending to the second hole portion is formed of a bonded magnet material.

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