Rotary electric machine rotor

Abstract

To realize a rotary electric machine rotor in which a function other than a function for fixing a permanent magnet can be given to a filling resin.SOLUTION: A rotor core 1 includes a bridge part 13 that is formed in a position between a pair of magnet arrangement holes 10 adjacent to each other in a circumferential direction C. The magnet arrangement hole 10 includes a specific region P disposed on the bridge part 13 side relative to a magnet arrangement region 10A. A specific resin part 30 that is a part of a filling resin 3 disposed in the specific region P includes a first engagement part 31 that is engaged with an outer adjacent region 14 which is a region of the rotor core 1 adjacent to an outer side of the magnet arrangement region 10A in a radial direction R, a second engagement part 32 that is engaged with an inner adjacent region 15 which is a region of the rotor core 1 adjacent to an inner side of the magnet arrangement region 10A in the radial direction R, and a connection part 33 connecting the first engagement part 31 and the second engagement part 32.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotor for a rotating electric machine comprising a rotor core, permanent magnets arranged in each of a plurality of magnet arrangement holes formed in the rotor core, and a filling resin filled in each of the plurality of magnet arrangement holes. [Background technology]

[0002] As disclosed in JP 2021-164216 A (Patent Document 1), in a so-called magnet-embedded type rotor for a rotating electric machine in which a permanent magnet is arranged in a magnet arrangement hole of a rotor core, the permanent magnet may be fixed to the rotor core by filling the magnet arrangement hole with resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-164216 A Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, the filled resin filled in the magnet arrangement holes has the function of fixing the permanent magnets to the rotor core. However, by providing the filled resin with additional value in addition to fixing the permanent magnets, the performance of the rotor for a rotating electric machine can be improved.

[0005] Therefore, it is desirable to realize a rotor for a rotating electric machine that allows the filled resin to have functions other than fixing the permanent magnets. [Means for solving the problem]

[0006] A rotor core; a permanent magnet disposed in each of a plurality of magnet arrangement holes formed in the rotor core; a filling resin filled in each of the magnet arrangement holes, A direction perpendicular to the rotation axis of the rotor core is defined as a radial direction, and a direction going around the rotation axis is defined as a circumferential direction, the rotor core includes a bridge portion formed at a position sandwiched between a pair of the magnet arrangement holes adjacent to each other in the circumferential direction, the magnet arrangement hole includes a magnet arrangement region in which the permanent magnet is arranged, and a specific region formed continuously with the magnet arrangement region and arranged on the bridge portion side with respect to the magnet arrangement region, The specific resin portion, which is a portion of the filled resin arranged in the specific region, is provided with a first engagement portion that engages with an outer adjacent region, which is a region of the rotor core adjacent to the radial outside of the magnet arrangement region, a second engagement portion that engages with an inner adjacent region, which is a region of the rotor core adjacent to the radial inside of the magnet arrangement region, and a connecting portion that connects the first engagement portion and the second engagement portion.

[0007] According to this configuration, the outer adjacent region and the inner adjacent region of the rotor core can be connected by the specific resin portion. Therefore, the radial stress acting on the bridge portion during rotation of the rotor can be shared by the specific resin portion. This makes it possible to, for example, narrow the circumferential dimension of the bridge portion, and obtain a highly efficient rotor for a rotating electric machine with less magnetic flux passing through the bridge portion. As described above, according to this configuration, in addition to the function of fixing the permanent magnets, the filled resin can be given the function of sharing the stress acting on the bridge portion, and as a result, it is easy to realize a highly efficient rotor for a rotating electric machine.

[0008] Further features and advantages of the techniques disclosed herein will become more apparent from the following description of exemplary and non-limiting embodiments, which proceeds with reference to the drawings. [Brief description of the drawings]

[0009] [Figure 1] Partial cross-sectional view of a rotor for a rotating electrical machine [Diagram 2] Enlarged view of the bridge area [Diagram 3]FIG. 13 is an enlarged view showing the periphery of the bridge portion in another embodiment. [Figure 4] FIG. 13 is a partial cross-sectional view of a rotor for a rotating electric machine according to another embodiment. [Diagram 5] FIG. 13 is a partial cross-sectional view of a rotor for a rotating electric machine according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a rotor for a rotating electric machine will be described with reference to the drawings.

[0011] In this specification, the term "rotating electric machine" is used as a concept that includes both motors, generators, and motor-generators that function as both a motor and a generator as necessary.

[0012] In this specification, a direction perpendicular to the rotation axis of the rotor core is defined as a "radial direction R", and a direction going around the rotation axis is defined as a "circumferential direction C".

[0013] 1, the rotor 100 for a rotating electric machine includes a rotor core 1, a permanent magnet 2 arranged in each of a plurality of magnet arrangement holes 10 formed in the rotor core 1, and a filled resin 3 filled in each of the plurality of magnet arrangement holes 10. In this embodiment, the rotor 100 for a rotating electric machine is an inner rotor type rotor for a rotating electric machine. Therefore, the rotor 100 for a rotating electric machine is arranged on the inside in the radial direction R with respect to a stator (not shown).

[0014] In this embodiment, the rotor core 1 has a cylindrical core outer peripheral surface F1. The rotor core 1 is formed, for example, by stacking a plurality of annular plate-shaped magnetic bodies (e.g., electromagnetic steel plates, etc.) in the axial direction, or is formed mainly from a compressed powder material obtained by pressure-molding a powdered magnetic body. Although not shown in detail, a shaft insertion hole into which a rotor shaft is inserted is provided along the axial direction of the rotor core 1 at the center portion of the radial direction R of the rotor core 1.

[0015] The magnet arrangement hole 10 is a space in which the permanent magnet 2 is arranged. The magnet arrangement hole 10 is formed in the rotor core 1 so as to extend along the axial direction. The shape of a cross section of the magnet arrangement hole 10 perpendicular to the axial direction is formed uniformly along the axial direction.

[0016] The magnet arrangement hole 10 includes a magnet arrangement region 10A in which a permanent magnet 2 is arranged, and a magnetic flux limiting region 10B formed contiguous with the magnet arrangement region 10A. The magnetic flux limiting region 10B is configured to be less permeable to magnetic flux than the rotor core 1 made of a magnetic material. The magnetic flux limiting region 10B is arranged at a position that divides the magnetic path connecting a pair of magnetic pole faces F2a of the permanent magnet 2. The magnetic flux limiting region 10B includes a specific region P, which will be described later.

[0017] A permanent magnet 2 is arranged in each magnet arrangement hole 10. In this embodiment, the permanent magnet 2 has a rectangular cross section perpendicular to the axial direction. The axial length of the permanent magnet 2 is equal to the axial length of the magnet arrangement hole 10.

[0018] The permanent magnets 2 are elements that constitute the magnetic poles of the rotor 100 for a rotating electric machine. The rotor 100 for a rotating electric machine has a plurality of magnetic poles that are distributed and arranged along the circumferential direction C. FIG. 1 shows one of the plurality of magnetic poles that the rotor 100 for a rotating electric machine has. One magnetic pole is formed using a plurality of permanent magnets 2 (six permanent magnets 2 in the illustrated example). A reference plane S shown in FIG. 1 is a virtual plane that extends along the axial direction at the center position of one magnetic pole in the circumferential direction C. In this embodiment, the plurality of permanent magnets 2 are arranged at positions that are symmetrical with respect to the reference plane S when viewed in the axial direction.

[0019] The filled resin 3 is disposed in the magnet arrangement hole 10 in an area other than the magnet arrangement region 10A. As described above, the magnet arrangement hole 10 includes the magnet arrangement region 10A and the magnetic flux limiting region 10B. Therefore, most of the filled resin 3 filled in the magnet arrangement hole 10 is disposed in the magnetic flux limiting region 10B. With this configuration, the filled resin 3 has the function of fixing the permanent magnet 2 to the rotor core 1.

[0020] In this embodiment, the filled resin 3 is a fiber-reinforced resin. Examples of such fiber-reinforced resin include glass fiber-reinforced resin, carbon fiber-reinforced resin, aramid fiber-reinforced resin, and Kevlar (registered trademark) fiber-reinforced resin. As the filled resin 3, a fiber-reinforced resin in which the base resin is a thermosetting resin (i.e., a fiber-reinforced thermosetting resin) can also be used.

[0021] The rotor core 1 has a bridge portion 13 formed at a position sandwiched between a pair of magnet arrangement holes 10 adjacent in the circumferential direction C. In this embodiment, the bridge portion 13 is formed between a pair of magnet arrangement holes 10 adjacent in the circumferential direction C, with a reference plane S in between. The bridge portion 13 extends along the radial direction R. In this example, a plurality of bridge portions 13 are arranged along the reference plane S. At least a portion of these plurality of bridge portions 13 is set as a target bridge portion 13T. In this embodiment, the target bridge portion 13T corresponds to the "bridge portion."

[0022] In this specification, one of a pair of magnet arrangement holes 10 arranged on both sides of the target bridge portion 13T in the circumferential direction C is defined as a first magnet arrangement hole 11, and the other is defined as a second magnet arrangement hole 12. When there is no particular distinction between the first magnet arrangement hole 11 and the second magnet arrangement hole 12, they may be collectively referred to simply as "magnet arrangement hole 10."

[0023] In this embodiment, at least one of the first magnet arrangement hole 11 and the second magnet arrangement hole 12 is arranged so as to move away from the target bridge portion 13T in the circumferential direction C as it moves outward in the radial direction R. In the illustrated example, both the first magnet arrangement hole 11 and the second magnet arrangement hole 12 are arranged so as to move away from the target bridge portion 13T in the circumferential direction C as it moves outward in the radial direction R.

[0024] 2, the magnet arrangement hole 10 is formed contiguous with the magnet arrangement area 10A and includes a specific area P disposed on the target bridge portion 13T side of the magnet arrangement area 10A. The specific area P is included in the magnetic flux restriction area 10B described above.

[0025] The specific resin part 30, which is a part arranged in the specific region P of the filled resin 3, is provided with a first engagement part 31 that engages with an outer adjacent region 14, which is a region of the rotor core 1 adjacent to the magnet arrangement region 10A on the outside in the radial direction R, a second engagement part 32 that engages with an inner adjacent region 15, which is a region of the rotor core 1 adjacent to the magnet arrangement region 10A on the inside in the radial direction R, and a connecting part 33 that connects the first engagement part 31 and the second engagement part 32.

[0026] The outer adjacent region 14 is a region adjacent to the outer side in the radial direction R of the portion of the magnet arrangement region 10A adjacent to the specific region P (the end of the permanent magnet 2 on the specific region P side). The inner adjacent region 15 is a region adjacent to the inner side in the radial direction R of the portion of the magnet arrangement region 10A adjacent to the specific region P (the end of the permanent magnet 2 on the specific region P side).

[0027] As described above, the rotor 100 for a rotating electric machine has the following features: Rotor core 1, A permanent magnet 2 arranged in each of a plurality of magnet arrangement holes 10 formed in a rotor core 1; A rotor for a rotating electric machine (100) including a filled resin (3) filled into each of a plurality of magnet arrangement holes (10), The direction perpendicular to the rotation axis of the rotor core 1 is defined as a radial direction R, and the direction going around the rotation axis is defined as a circumferential direction C. The rotor core 1 includes a bridge portion 13 (target bridge portion 13T) formed at a position sandwiched between a pair of magnet arrangement holes 10 adjacent to each other in the circumferential direction C, The magnet arrangement hole 10 includes a magnet arrangement region 10A in which a permanent magnet 2 is arranged, and a specific region P that is formed continuously with the magnet arrangement region 10A and is arranged on the bridge portion 13 (target bridge portion 13T) side of the magnet arrangement region 10A, The specific resin part 30, which is a part arranged in the specific region P of the filled resin 3, is provided with a first engagement part 31 that engages with an outer adjacent region 14, which is a region of the rotor core 1 adjacent to the magnet arrangement region 10A on the outside in the radial direction R, a second engagement part 32 that engages with an inner adjacent region 15, which is a region of the rotor core 1 adjacent to the magnet arrangement region 10A on the inside in the radial direction R, and a connecting part 33 that connects the first engagement part 31 and the second engagement part 32.

[0028] According to this configuration, the outer adjacent region 14 and the inner adjacent region 15 of the rotor core 1 can be connected by the specific resin portion 30. Therefore, the stress in the radial direction R acting on the bridge portion 13 (target bridge portion 13T) during rotation of the rotor 100 can be shared by the specific resin portion 30. As a result, for example, the circumferential dimension of the bridge portion 13 (target bridge portion 13T) can be narrowed, and a highly efficient rotor for a rotating electric machine 100 with less magnetic flux passing through the bridge portion 13 (target bridge portion 13T) can be obtained. As described above, according to this configuration, in addition to the function of fixing the permanent magnet 2, the filled resin 3 can be given the function of sharing the stress acting on the bridge portion 13 (target bridge portion 13T), and as a result, a highly efficient rotor for a rotating electric machine 100 can be easily realized.

[0029] In addition, in this embodiment, The rotor core 1 has a cylindrical core outer peripheral surface F1. One of a pair of magnet arrangement holes 10 arranged on both sides of the bridge portion 13 (target bridge portion 13T) in the circumferential direction C is designated as a first magnet arrangement hole 11, and the other is designated as a second magnet arrangement hole 12. At least one of the first magnet arrangement hole 11 and the second magnet arrangement hole 12 is arranged so that as it moves outward in the radial direction R, it moves away from the bridge portion 13 (target bridge portion 13T) in the circumferential direction C (see Figure 1).

[0030] According to this configuration, it is easy to effectively utilize reluctance torque in a rotating electric machine having a rotor. On the other hand, in such a configuration, the outer part of the rotor core 1 in the radial direction R with respect to the magnet arrangement hole 10 is divided by the multiple magnet arrangement holes 10 from the inner part of the rotor core 1 in the radial direction R, and there is likely to be little room to provide a bridge part or the like that supports the centrifugal force acting on the outer part. Therefore, high rigidity is required for each bridge part, which tends to lead to an increase in size of the bridge part. However, according to this configuration, the stress in the radial direction R acting on the bridge part 13 (target bridge part 13T) can be shared by the specific resin part 30, so that it is easy to narrow the dimension of the bridge part 13 (target bridge part 13T) in the circumferential direction C without increasing the size of the bridge part 13 (target bridge part 13T).

[0031] Here, in this specification, "the first engagement portion 31 engages with the outer adjacent region 14" means that the first engagement portion 31 engages with the outer adjacent region 14 so as to be able to transmit a load in the radial direction R. The first engagement portion 31 has a portion that contacts at least the outer adjacent region 14 in the radial direction R.

[0032] The same applies to the second engagement portion 32. That is, in this specification, "the second engagement portion 32 engages with the inner adjacent region 15" means that the second engagement portion 32 engages with the inner adjacent region 15 so as to be able to transmit a load in the radial direction R. The second engagement portion 32 has a portion that contacts at least the inner adjacent region 15 in the radial direction R.

[0033] In this embodiment, the first engagement portion 31 includes a first boundary portion 31a which is a boundary with the connecting portion 33, and a first protruding portion 31b disposed on the outside of the first boundary portion 31a in the radial direction R. A dimension Db1 of the first protruding portion 31b in the circumferential direction C is larger than a dimension Da1 of the first boundary portion 31a in the circumferential direction C. As a result, a hook portion is formed around the first boundary portion 31a, and the first engagement portion 31 is in partial contact with the outer adjacent region 14 in the radial direction R.

[0034] In this embodiment, the second engagement portion 32 includes a second boundary portion 32a that is a boundary with the connecting portion 33, and a second protruding portion 32b that is disposed inside the second boundary portion 32a in the radial direction R. A dimension Db2 in the circumferential direction C of the second protruding portion 32b is larger than a dimension Da2 in the circumferential direction C of the second boundary portion 32a. As a result, a hook portion is formed around the second boundary portion 32a, and the second engagement portion 32 is in partial contact with the inner adjacent region 15 in the radial direction R.

[0035] As described above, in this embodiment, The first engagement portion 31 includes a first boundary portion 31a which is a boundary with the connecting portion 33, and a first protruding portion 31b which is disposed on the outer side of the first boundary portion 31a in the radial direction R. The second engagement portion 32 includes a second boundary portion 32a that is a boundary with the connecting portion 33, and a second protruding portion 32b that is disposed on the inner side in the radial direction R of the second boundary portion 32a. A dimension Db1 of the first protruding portion 31b in the circumferential direction C is larger than a dimension Da1 of the first boundary portion 31a in the circumferential direction C, A dimension Db2 in the circumferential direction C of the second protruding portion 32b is greater than a dimension Da2 in the circumferential direction C of the second boundary portion 32a.

[0036] According to this configuration, the first protrusion 31b can be properly engaged with the outer adjacent region 14 of the rotor core 1, and the second protrusion 32b can be properly engaged with the inner adjacent region 15 of the rotor core 1, so that the radial R stress acting on the bridge portion 13 adjacent thereto (target bridge portion 13T) can be properly supported.

[0037] In this embodiment, the connecting portion 33 is formed so as to bulge inward in the circumferential direction C with respect to the first boundary portion 31a and the second boundary portion 32a. In this example, the connecting portion 33 includes a first connecting bulge portion 331 that is continuous with the first boundary portion 31a and bulges inward in the circumferential direction C with respect to the first boundary portion 31a, and a second connecting bulge portion 332 that is continuous with the second boundary portion 32a and bulges inward in the circumferential direction C with respect to the second boundary portion 32a. In this embodiment, the connecting portion 33 is formed so as to bulge outward in the circumferential direction C as well with respect to the first boundary portion 31a and the second boundary portion 32a. In this example, the connecting portion 33 includes a third connecting bulge portion 333 that is continuous with the first boundary portion 31a and bulges outward in the circumferential direction C from the first boundary portion 31a, and a fourth connecting bulge portion 334 that is continuous with the second boundary portion 32a and bulges outward in the circumferential direction C from the second boundary portion 32a.

[0038] The second connecting bulge 332 can support a stress (centrifugal force) acting outward in the radial direction R on the bridge portion 13 (target bridge portion 13T) during rotation of the rotor 100. Therefore, the stress acting outward in the radial direction R on the bridge portion 13 (target bridge portion 13T) is supported not only by the first engaging portion 31 but also by the second connecting bulge 332. Therefore, it is easy to disperse the stress in the radial direction R acting on the bridge portion 13 (target bridge portion 13T).

[0039] On the other hand, the first connecting bulge 331 can support a stress (a reaction force against a centrifugal force) acting inward in the radial direction R on the bridge portion 13 (target bridge portion 13T) during rotation of the rotor 100. Therefore, the stress acting inward in the radial direction R on the bridge portion 13 (target bridge portion 13T) is supported not only by the second engaging portion 32 but also by the first connecting bulge 331. Therefore, it is easy to disperse the stress in the radial direction R acting on the bridge portion 13 (target bridge portion 13T).

[0040] In this embodiment, the first engagement portion 31 and the second engagement portion 32 have mirror symmetrical shapes with respect to the connecting portion 33. This makes it easy to make the engagement force of the first engagement portion 31 and the engagement force of the second engagement portion 32 equal. Therefore, the stress in the radial direction R acting on the target bridge portion 13T can be easily supported in a well-balanced manner by the first engagement portion 31 and the second engagement portion 32.

[0041] In this embodiment, the first protruding portion 31b constituting a part of the first engaging portion 31 bulges inward in the circumferential direction C (toward the reference plane S) from the first boundary portion 31a, and also bulges outward in the circumferential direction C (toward the opposite side to the reference plane S) from the first boundary portion 31a. This makes it easier for the first engaging portion 31 to support in a balanced manner the stress acting on the outer adjacent region 14 in the radial direction R.

[0042] In this embodiment, the second protruding portion 32b constituting a part of the second engaging portion 32 bulges inward in the circumferential direction C (toward the reference plane S) from the second boundary portion 32a, and also bulges outward in the circumferential direction C (toward the opposite side to the reference plane S) from the second boundary portion 32a. This makes it easier for the second engaging portion 32 to support in a balanced manner the stress acting on the inner adjacent region 15 in the radial direction R.

[0043] In this embodiment, the first boundary portion 31a is disposed further outward in the radial direction R than the magnetic pole face F2a (magnetic pole face F2a facing outward in the radial direction R; the same applies below) of the permanent magnet 2 disposed in the magnet arrangement area 10A continuous with the specific area P. Specifically, as illustrated, the first boundary portion 31a is disposed further outward in the radial direction R than a line extending from the magnetic pole face F2a of the permanent magnet 2.

[0044] In this embodiment, the second boundary portion 32a is disposed further outward in the radial direction R than the magnetic pole face F2a (magnetic pole face F2a facing inward in the radial direction R; the same applies below) of the permanent magnet 2 disposed in the magnet arrangement area 10A continuous with the specific area P. Specifically, as illustrated, the second boundary portion 32a is disposed further outward in the radial direction R than a line extending from the magnetic pole face F2a of the permanent magnet 2.

[0045] As described above, according to the rotor 100 for a rotating electric machine according to the present disclosure, the first engagement portion 31 engages with the outer adjacent region 14 of the rotor core 1, and the second engagement portion 32 engages with the inner adjacent region 15 of the rotor core 1. Therefore, the stress in the radial direction R acting on the bridge portion 13 (target bridge portion 13T) during rotation of the rotor 100 can be shared by the specific resin portion 30. Therefore, it is possible to provide the filled resin 3 with functions other than fixing the permanent magnets 2.

[0046] As described above, in this embodiment, The filled resin 3 is a fiber reinforced resin.

[0047] According to this configuration, it is easy to minimize the elongation of the specific resin part 30 when stress acts by ensuring the rigidity of the specific resin part 30. Therefore, it is easy to increase the proportion of the stress acting on the bridge part 13 (target bridge part 13T) that can be borne by the specific resin part 30.

[0048] Other embodiments Next, other embodiments will be described.

[0049] (1) In the above embodiment, the connecting portion 33 is formed to bulge inward in the circumferential direction C with respect to the first boundary 31a and the second boundary 32a. However, the present invention is not limited to such a configuration, and the connecting portion 33 may not bulge with respect to the first boundary 31a and the second boundary 32a, for example, as shown in Fig. 3. In other words, the dimension of the connecting portion 33 in the circumferential direction C may be equal to the dimension Da1 of the first boundary 31a in the circumferential direction C and the dimension Da2 of the second boundary 32a in the circumferential direction C, or may be smaller than these dimensions Da1 and Da2.

[0050] (2) In the above embodiment, the number of permanent magnets 2 constituting one magnetic pole is six. However, the present invention is not limited to such a configuration, and one magnetic pole may be formed by two permanent magnets 2, as shown in FIG. 4. In the example shown in FIG. 4, a pair of permanent magnets 2 are arranged in a "V" shape at positions symmetrical with respect to the reference plane S when viewed in the axial direction. A bridge portion 13 is formed between the pair of permanent magnets 2 in the circumferential direction C, and a specific resin portion 30 adjacent to the bridge portion 13 in the circumferential direction C is arranged in each of the pair of permanent magnets 2. Also, different from this example, for example, a configuration as shown in FIG. 5 may be used. That is, one magnetic pole may be formed by three permanent magnets 2. In the example shown in FIG. 5, three permanent magnets 2 are arranged side by side, and the central permanent magnet 2, which is arranged so that the magnetic pole surface F2a is perpendicular to the radial direction R, is arranged so as to overlap with the reference plane S. Each of the pair of permanent magnets 2 arranged on either side of the central permanent magnet 2 in the circumferential direction C is arranged so as to move away from the central permanent magnet 2 in the circumferential direction C as it moves outward in the radial direction R. A bridge portion 13 is formed between each permanent magnet 2, and a specific resin portion 30 is arranged adjacent to each bridge portion 13 in the circumferential direction C.

[0051] (3) In the above embodiment, the filling resin 3 is a fiber-reinforced resin. However, the filling resin 3 is not limited to this configuration, and a thermosetting resin such as an epoxy resin may be used as the filling resin 3.

[0052] (4) The configurations disclosed in the above-described embodiments can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. As for other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications can be made as appropriate within the scope of the present disclosure. [Industrial Applicability]

[0053] The technology disclosed herein can be utilized in a rotor for a rotating electric machine comprising a rotor core, permanent magnets arranged in each of a plurality of magnet arrangement holes formed in the rotor core, and a filling resin filled in each of the plurality of magnet arrangement holes. [Explanation of symbols]

[0054] 100: rotor for rotating electric machine, 1: rotor core, 10: magnet arrangement hole, 10A: magnet arrangement region, 11: first magnet arrangement hole, 12: second magnet arrangement hole, 13: bridge portion, 14: outer adjacent region, 15: inner adjacent region, 2: permanent magnet, 3: filled resin, 30: specific resin portion, 31: first engagement portion, 31a: first boundary portion, 31b: first protruding portion, 32: second engagement portion, 32a: second boundary portion, 32b: second protruding portion, 33: connecting portion, C: circumferential direction, Da1: circumferential dimension of first boundary portion, Da2: circumferential dimension of second boundary portion, Db1: circumferential dimension of first protruding portion, Db2: circumferential dimension of second protruding portion, F1: core outer peripheral surface, P: specific region, R: radial direction

Claims

1. A rotor core; a permanent magnet disposed in each of a plurality of magnet arrangement holes formed in the rotor core; a filling resin filled in each of the magnet arrangement holes, A direction perpendicular to the rotation axis of the rotor core is defined as a radial direction, and a direction going around the rotation axis is defined as a circumferential direction, the rotor core includes a bridge portion formed at a position sandwiched between a pair of the magnet arrangement holes adjacent to each other in the circumferential direction, the magnet arrangement hole includes a magnet arrangement region in which the permanent magnet is arranged, and a specific region formed continuously with the magnet arrangement region and arranged on the bridge portion side with respect to the magnet arrangement region, A rotor for a rotating electric machine, wherein a specific resin portion, which is a portion of the filled resin arranged in the specific region, is provided with a first engagement portion that engages with an outer adjacent region, which is a region of the rotor core adjacent to the radial outside of the magnet arrangement region, a second engagement portion that engages with an inner adjacent region, which is a region of the rotor core adjacent to the radial inside of the magnet arrangement region, and a connecting portion that connects the first engagement portion and the second engagement portion.

2. The first engagement portion includes a first boundary portion that is a boundary with the connecting portion, and a first protrusion portion that is disposed radially outward from the first boundary portion, The second engagement portion includes a second boundary portion that is a boundary with the connecting portion, and a second protruding portion that is disposed radially inward relative to the second boundary portion, A circumferential dimension of the first protruding portion is greater than a circumferential dimension of the first boundary portion, The rotor for a rotating electric machine according to claim 1 , wherein a dimension of the second protruding portion in the circumferential direction is larger than a dimension of the second boundary portion in the circumferential direction.

3. The rotor core has a cylindrical core outer circumferential surface, one of the pair of magnet arrangement holes arranged on both sides in the circumferential direction with the bridge portion therebetween is a first magnet arrangement hole and the other is a second magnet arrangement hole, 3. The rotor for a rotating electric machine according to claim 1, wherein at least one of the first magnet arrangement hole and the second magnet arrangement hole is arranged so as to move away from the bridge portion in the circumferential direction as it moves radially outward.

4. 3. The rotor for a rotating electric machine according to claim 1, wherein the filled resin is a fiber reinforced resin.

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