Rotor structure

Abstract

The purpose of the present invention is to provide a rotor structure capable of suppressing temperature rise.　A rotor structure of a rotary electric machine includes: a rotor (10) provided with a magnet housing part (14) for housing a magnet (17); and an end plate (30) for suppressing movement of the magnet (17) in a rotor axial direction. The end plate (30) has a recess (31) having an outer periphery recessed radially inward. The recess overlaps with a part of the magnet when viewed in the rotor axial direction.

Description

Rotor structure

[0001] The present invention relates to a rotor structure.

[0002] Conventionally, a rotor is provided with a magnet housing portion penetrating in the axial direction. By providing end plates at both axial ends of the rotor, the magnets housed in the magnet housing portion are prevented from slipping out in the axial direction (see, for example, Patent Document 1).

[0003] Japanese Unexamined Patent Publication No. 2013-99051

[0004] However, when the magnets housed in the magnet housing portion are clamped by the end plates as in the conventional rotor, eddy current is generated between the end plates and the magnets, which causes heat generation and increases the temperature of the rotor. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotor structure capable of suppressing temperature rise.

[0005] In order to achieve the above object, the rotor structure of a rotating electrical machine according to the present invention is a rotor structure comprising: a rotor provided with a magnet housing portion for housing a magnet; and an end plate that suppresses movement of the magnet in the rotor axial direction, wherein the end plate has a recess whose outer periphery is recessed radially inward, and the recess overlaps a part of the magnet when viewed in the rotor axial direction.

[0006] According to the present invention, since the magnet is partially supported by the end plate so as to overlap the recess, movement of the magnet in the axial direction can be suppressed, and a part of the magnet is exposed from the end plate, so that cooling efficiency can be improved, and temperature rise of the rotor structure can be suppressed.

[0007] Figure 1 is a perspective view of a rotor. Figure 2 is a view of the rotor viewed from the rotor axial direction. Figure 3 is a cross-sectional view taken along line III-III in Figure 2. Figure 4 is an enlarged view of area A in Figure 2.

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0009] Figure 1 is a perspective view showing the rotor 10 of a rotating electric machine in Embodiment 1. Figure 2 is a view of the rotor 10 from the direction of the rotor axis. Figure 3 is a cross-sectional view taken along line III-III of Figure 2. The rotor 10 is used in the rotor structure of a rotating electric machine (not shown). The rotor 10 is a substantially annular shape with the rotor axis C as its axis. The rotating electric machine is, for example, a drive motor for a mobile vehicle such as a saddle-type vehicle, but it may also be a motor other than a drive motor, or a motor used for purposes other than mobile vehicles. Furthermore, the rotating electric machine may also be used as a generator.

[0010] As shown in Figures 1 and 2, the rotor 10 has an annular rotor body 11. The rotor body 11 is constructed by stacking a plurality of annular plates in the direction of the rotor axis. An axial hole 11a (see Figure 3) is provided in the center of the rotor body 11, penetrating in the direction of the rotor axis. A retaining member 20 passes through the axial hole 11a.

[0011] As shown in Figure 3, the retaining member 20 has a cylindrical shaft retaining portion 21 extending in the direction of the rotor axis, and fixing portions 22 that extend outward in the radial direction of the rotor at both ends of the shaft retaining portion 21. The fixing portions 22 fix the position of the rotor body 11 and the retaining member 20, preventing the retaining member 20 from falling off. The outer diameter of the shaft retaining portion 21 is approximately the same as the inner diameter of the shaft hole 11a. The rotor body 11 holds a rotor shaft (not shown) via the retaining member 20, and the rotor shaft passes through the rotor body 11.

[0012] As shown in Figure 2, the rotor body 11 has communication passages 13 formed on the outer side of the rotor radially from the shaft hole 11a. The communication passages 13 are arranged at regular intervals with respect to the rotor circumferential direction. In this embodiment, eight communication passages 13 are provided. In other words, in this embodiment, communication passages 13 are formed at 45-degree intervals with respect to the rotor circumferential direction. Cooling air and lubricating oil flow through the communication passages 13. By forming the communication passages 13 in this way, the contact area between the cooling air and oil increases compared to when the communication passages 13 are not provided, and the cooling efficiency of the rotor 10 can be improved. Therefore, the temperature rise of the rotor 10 can be suppressed.

[0013] Furthermore, in the circumferential direction of the rotor, second communication passages 12 are formed between some of the communication passages 13. The second communication passages 12 are smaller than the size of the communication passages 13 when viewed in the axial direction of the rotor 10. In this embodiment, three second communication passages 12 are arranged at 45-degree intervals, and then three more are arranged at 45-degree intervals with a 90-degree gap. In other words, six second communication passages 12 are provided. Cooling air and oil flow through the second communication passages 12, just like the communication passages 13.

[0014] Multiple magnet housings 14 are formed in the rotor body 11, penetrating in the direction of the rotor axis. The magnet housings 14 are formed so as to be between the connecting passages 13 in the rotor circumferential direction, and outside the connecting passages 13 and the second connecting passage 12 in the rotor radial direction. Multiple magnet housings 14 are provided at regular intervals with respect to the rotor circumferential direction. In this embodiment, eight magnet housings 14 are provided. In other words, in this embodiment, magnet housings 14 are provided at 45-degree intervals with respect to the rotor circumferential direction, and the magnet housings 14 and the connecting passages 13 are arranged alternately at 22.5-degree intervals.

[0015] Figure 4 is an enlarged view of region A in Figure 2. The magnet housing section 14 is composed of a magnet housing hole 15 on the inner side in the rotor radial direction and a magnet housing groove 16 on the outer side in the rotor radial direction. The magnet housing section 14 is arranged in a V-shape such that the distance between the magnet housing hole 15 and the magnet housing groove 16 widens towards the outer side in the rotor radial direction and narrows towards the inner side in the rotor radial direction. In other words, the magnet housing section 14 is spaced further apart towards the outer side in the rotor radial direction relative to the straight line L1.

[0016] The magnet housing section 14 has V-shaped magnet housing holes 15 such that, when viewed in the direction of the rotor axis, the distance between the magnets widens as it moves outward in the rotor radial direction and narrows as it moves inward in the rotor radial direction. In other words, the magnet housing holes 15 are V-shaped holes formed by an extension hole portion 15a extending in one direction (direction of the line L2) from the line L1, an extension hole portion 15b extending in the other direction (direction of the line L3), and an intersecting hole portion 15c where the extension holes 15a and 15b intersect on the line L1.

[0017] Furthermore, the magnet housing section 14 is positioned outside the magnet housing hole 15 in the rotor radial direction and has magnet housing grooves 16 extending in one direction and the other direction of the magnet housing hole 15. The magnet housing grooves 16 are exposed on the outer side in the rotor radial direction and are not covered by the rotor body 11.

[0018] Magnets 17 are arranged in the magnet housing section 14. The magnets 17 are rectangular in shape when viewed in the direction of the rotor axis, and more specifically, they are prism-shaped magnets that extend across the entire surface of the magnet housing hole 15 and magnet housing groove 16 in the direction of the rotor axis. For example, permanent magnets are used for the magnets 17. In this embodiment, one magnet 17 is arranged in the magnet housing groove 16. In addition, in the magnet housing hole 15, one magnet 17 is arranged in the extension hole 15a on one side and one in the extension hole 15b on the other side, so as to be symmetrical with respect to the axis (straight line L1) of the object. Therefore, four magnets are arranged in the magnet housing section 14, and a total of 32 magnets 17 are provided in the rotor 10 as a whole.

[0019] Figure 4 is an enlarged view of region A in Figure 2. In a view along the rotor axis, parts of the magnet housing holes 15 and magnet housing grooves 16 are not embedded in the magnets 17, forming gaps 15a1, 15b1, 15c1, and 16a. More specifically, the surfaces of the magnet housing grooves 16 in the extending direction (linear L2 direction and linear L3 direction) do not contact the magnets 17, forming a gap 16a. In addition, in the magnet housing holes 15, no magnets 17 are placed in the intersecting holes 15c, forming a gap 15c1, and the surfaces of the extending holes 15a and 15b in the extending direction do not contact the magnets 17, forming gaps 15a1 and 15b1. In other words, the magnet housing holes 15 have gaps at both ends of the magnets 17 in the extending direction. Cooling air and oil flow through these gaps 15a1, 15b1, 15c1, and 16a, similar to the communication passage 13. In this way, by forming gaps 15a1, 15b1, 15c1, and 16a, the contact area with cooling air and oil increases, similar to when forming the communication passage 13, and the cooling efficiency of the rotor 10 can be improved. Therefore, the temperature rise of the rotor 10 can be suppressed.

[0020] In this embodiment, when the magnet 17 is housed in the magnet housing groove 16, the magnet 17 is exposed on the radially outer side of the rotor. Therefore, the rotor body 11 is provided with a magnet retaining portion 19 to prevent the magnet 17 housed in the magnet housing groove 16 from protruding radially outward from the rotor body 11.

[0021] The magnet retaining portion 19 is formed on a protruding portion 18 that, when viewed in the direction of the rotor axis, is between the magnet housing portions 14 and is not covered by the end plate 30 (described later), and protrudes from the end plate 30 (specifically the convex portion 32, described later). The magnet retaining portion 19 is substantially L-shaped. The magnet retaining portion 19 extends from the surface of the protruding portion 18 in the rotor circumferential direction toward the rotor circumferential direction, and then extends toward the rotor radial center. The magnet retaining portion 19 holds the magnet 17 from the outside in the extending direction by the surface extending toward the rotor radial center. The magnet retaining portions 19 are provided at both ends of the protruding portion 18 in the rotor circumferential direction. The magnet retaining portions 19 prevent the magnets 17, which are housed in the magnet housing grooves 16 adjacent to each protruding portion 18, from flying out in the rotor radial direction.

[0022] Since the magnet retaining portion 19 is substantially L-shaped, a second cooling gap 19a is provided, surrounded by the magnet retaining portion 19, the protruding portion 18, and the magnet in the magnet housing groove 16. Cooling air and oil flow through the second cooling gap 19a, just like the communication passage 13 and gaps 15a1, 15b1, 15c1, and 16a. By forming the second cooling gap 19a in this way, the contact area with cooling air and oil increases, similar to when the communication passage 13 and gaps 15a1, 15b1, 15c1, and 16a are formed, thereby improving the cooling efficiency of the rotor 10. Therefore, the temperature rise of the rotor 10 can be suppressed.

[0023] The rotor 10 includes end plates 30 which are substantially disc-shaped non-magnetic plates. The end plates 30 are provided at both ends of the rotor body 11 in the direction of the rotor axis. If a magnetic material were used for the end plates 30, eddy currents would be generated by the current flowing between the end plates 30 and the magnets 17, which would increase the amount of heat generated by the rotor 10 and could cause the rotor 10 to overheat. In contrast, in this embodiment, since non-magnetic end plates 30 are used, the generation of eddy currents can be suppressed and the amount of heat generated by the rotor 10 can be reduced.

[0024] The outer diameter of the end plate 30 is smaller than the outer diameter of the rotor body 11. When viewed in the direction of the rotor axis, a portion of the end plate 30 overlaps with the magnet 17, preventing the magnet 17 from protruding in the direction of the rotor axis.

[0025] The end plate 30 is provided with a substantially V-shaped recess 31 corresponding to the magnet housing portion 14 of the rotor body 11. In other words, the end plate 30 has a convex portion 32 between the recesses 31 of the end plate 30, which is convex with respect to the rotor radial direction.

[0026] In a view along the rotor axis, the outer periphery lines 31L2 and 31L3 that constitute the recess 31 of the end plate 30 extend along the magnet 17. That is, the outer periphery lines 31L2 and 31L3 of the recess 31 extend in the direction of extension of the magnet housing 14 (in the straight line L2 direction and the straight line L3 direction).

[0027] In this case, the recess 31 is formed such that more than half the area of ​​the magnet 17 is exposed from the end plate 30. Also, the corner (curved portion) 31a (which can also be called the corner of the convex portion) and the corner portion 31b of the recess 31 are curved. This curvature of the corner portion 31a of the end plate 30 overlaps with the magnet 17 housed in the magnet housing groove 16 when viewed in the direction of the rotor axis. In other words, the outer portion (corner portion 31a) of each recess 31 of the end plate 30 that overlaps with the magnet 17 (outer circumference lines 31L2, 31L3) is located inward in the rotor radial direction from the outer edge of the magnet 17 in the rotor radial direction.

[0028] Thus, when viewed in the direction of the rotor axis, the end plate 30 does not completely cover the magnet 17, leaving the magnet 17 exposed. This allows for efficient cooling of the magnet 17 and suppresses the temperature rise of the rotor 10. Furthermore, by reducing the area over which the end plate 30 presses against the magnet 17, the generation of eddy currents in the end plate 30 can be suppressed, thereby suppressing the temperature rise of the rotor 10.

[0029] Furthermore, the corner portion 31a of the recess 31 is located inward in the rotor radial direction from the outer end of the magnet 17 in the rotor radial direction. This prevents the magnet 17 from protruding in the rotor axial direction without covering it more than necessary, and by forming the recess 31 in the end plate 30, it is possible to make the end plate 30 smaller and lighter.

[0030] The end plate 30 has an opening 33 that corresponds to the communication passage 13. A second opening 34 is also formed that corresponds to the second communication passage 12. Specifically, the opening 33 of the end plate 30 is formed to overlap with the communication passage 13 of the rotor body 11 when viewed in the direction of the rotor axis. Similarly, the second opening 34 of the end plate 30 is formed to overlap with the second communication passage 12 when viewed in the direction of the rotor axis. This allows cooling air and oil to flow through the communication passage 13 and the second communication passage 12 even when the end plate 30 is attached to the rotor body 11.

[0031] By forming a recess 31, the end plate 30 does not cover the gaps 15a1, 15b1, 15c1, 16a and the second cooling gap 19a, even when attached to both ends of the rotor body 11. Therefore, even when the end plate 30 is attached to the rotor body 11, cooling air and oil can still flow through the communication passage 13, the gaps 15a1, 15b1, 15c1, 16a and the second cooling gap 19a.

[0032] As described above, in a rotor structure comprising a rotor 10 provided with a magnet housing portion 14 for housing magnets 17, and an end plate 30 that suppresses the movement of magnets 17 in the rotor axial direction, the end plate 30 has a recess 31 on its outer circumference that is recessed inward in the rotor radial direction, and in a view in the rotor axial direction, the recess 31 overlaps with a part of the magnet 17. With this configuration, in a view in the rotor axial direction, the magnet 17 is supported so as to overlap with the recess 31, so the movement of magnets 17 in the rotor axial direction can be suppressed, and since a part of the magnet 17 is exposed from the end plate 30, the cooling efficiency can be improved, and by reducing the area in which the end plate 30 presses against the magnet 17, the generation of eddy currents generated in the end plate 30 can be suppressed, and the temperature rise of the rotor structure can be suppressed. Furthermore, the recess 31 formed in the end plate 30 makes it possible to reduce the weight of the end plate 30.

[0033] The magnets 17 are arranged along an inclination angle that increases towards the outer side of the rotor in the radial direction relative to a straight line L1 extending from the rotor axis in the rotor radial direction when viewed in the direction of the rotor axis, and the recess 31 is shaped to match the arrangement of the magnets 17. With this configuration, since the recess 31 of the end plate 30 is formed along the arrangement of the magnets 17, the end plate 30 prevents the magnets 17 from protruding radially and also exposes the magnets 17 to improve cooling efficiency, thereby suppressing the temperature rise of the rotor 10. In addition, the end plate 30 can be made lighter by forming the recess 31.

[0034] The magnet housing section 14 houses the magnets 17 along an inclination angle that increases with respect to the straight line L1 extending radially from the rotor axis, with the straight line L1 in the rotor radial direction in the view along the rotor axis. There are gaps 15a1, 15b1, 15c1, and 16a between the magnets 17 that penetrate in the direction of the rotor axis, and these gaps 15a1, 15b1, 15c1, and 16a do not overlap with the end plate 30 in the direction of the rotor axis. With this configuration, by providing gaps 15a1, 15b1, 15c1, and 16a, cooling air and oil can be flowed through the gaps 15a1, 15b1, 15c1, and 16a, increasing the contact area between the rotor structure and the cooling air and oil. Therefore, the rotor structure can be cooled efficiently, and the temperature rise of the rotor structure can be suppressed.

[0035] The end plate 30 has an opening 33 that penetrates in the direction of the rotor axis, and the rotor 10 has a connecting passage 13 that penetrates in the direction of the rotor axis, with the opening 33 and the connecting passage 13 overlapping in the direction of the rotor axis. With this configuration, the opening 33 of the end plate 30 and the connecting passage 13 of the rotor 10 overlap, allowing cooling air or oil to flow through the opening 33 and the connecting passage 13. Therefore, the cooling efficiency of the rotor 10 can be increased, and the temperature rise of the rotor 10 can be suppressed.

[0036] The end plate 30 has recesses 31 spaced apart in the circumferential direction of the rotor. When viewed in the direction of the rotor axis, the portion of each recess 31 of the end plate 30 that overlaps with the magnet 17 is formed as a corner portion 31a that protrudes outward in the direction of the rotor axis. The portion between each corner portion 31a that forms the space between each recess 31 of the end plate is located inward in the direction of the rotor axis than the outer end of the magnet 17 in the direction of the rotor axis. With this configuration, the corner portion 31a reduces the overlap between the end plate 30 and the magnet 17 when viewed in the direction of the rotor axis, allowing more of the magnet 17 to be exposed. Therefore, the rotor 10 can be cooled efficiently, and the temperature rise of the rotor 10 can be suppressed. In addition, the end plate 30 can be made smaller and lighter while preventing the magnet 17 from protruding in the direction of the rotor axis.

[0037] The rotor 10 is provided with a magnet retaining portion 19 that extends from the outer side to the inner side in the radial direction of the rotor of the magnet 17. A second cooling gap 19a is provided between the magnet retaining portion 19 and the magnet 17, and at least a portion of the second cooling gap 19a does not overlap with the end plate 30 when viewed in the direction of the rotor axis. With this configuration, by providing the second cooling gap 19a in a position that does not overlap with the end plate 30, cooling air or oil can be flowed into the second cooling gap 19a. Therefore, the cooling efficiency can be increased and the temperature rise of the rotor 10 can be suppressed.

[0038] The end plate 30 is made of a non-magnetic material. With this configuration, by using a non-magnetic end plate 30, the eddy currents generated between the end plate 30 and the magnet 17 can be reduced. Therefore, heat generation on the rotor 10 side can be suppressed, and the temperature rise of the rotor 10 can be suppressed.

[0039] [Other Embodiments] The embodiments described above are merely one aspect of the present invention and can be modified and applied as needed without departing from the spirit of the present invention.

[0040] In the above-described embodiment, an example was explained in which a V-shaped magnet housing portion 14 is provided. However, the shape of the magnet housing portion and the number of magnets housed in the magnet housing portion are not particularly limited. For example, the magnet housing holes and magnet housing grooves may be arranged in a U-shape, resulting in a U-shaped magnet housing portion.

[0041] In the embodiment described above, an example was described in which eight magnet housings 14 are provided. However, the number of magnet housings is not limited to eight; there may be fewer than eight magnet housings or more than eight magnet housings. Furthermore, the number of communication passages formed in the rotor and the openings formed in the end plates are not limited and can be changed as appropriate.

[0042] [Configurations supported by the above embodiment] The above embodiment supports the following configurations.

[0043] (Configuration 1) A rotor structure for a rotating electric machine, comprising: a rotor provided with a magnet accommodating portion that accommodates a magnet; and an end plate that suppresses movement of the magnet in a rotor axial direction, wherein the end plate has a recess whose outer periphery is recessed radially inward of the rotor, and the recess overlaps a part of the magnet when viewed in the rotor axial direction. According to this configuration, since the magnet is supported so as to overlap the recess when viewed in the rotor axial direction, movement of the magnet in the rotor axial direction can be suppressed, and a part of the magnet is exposed from the end plate, whereby cooling efficiency can be improved. In addition, by reducing the area where the end plate presses the magnet, the generation of eddy currents occurring in the end plate can be suppressed, and the temperature rise of the rotor structure can be suppressed. Further, the recess formed in the end plate enables weight reduction of the end plate.

[0044] (Configuration 2) The rotor structure for a rotating electric machine according to Configuration 1, wherein the magnet is arranged along an inclination angle that increases in distance toward the outer side in the rotor radial direction with respect to a straight line extending radially of the rotor from an axis of the rotor when viewed in the rotor axial direction, and the recess has a shape conforming to the arrangement of the magnet. According to this configuration, since the recess of the end plate is formed along the arrangement of the magnet, the end plate can prevent the magnet from protruding outward in the rotor radial direction, and exposes the magnet to improve cooling efficiency, whereby the temperature rise of the rotor structure can be suppressed. Further, forming the recess enables weight reduction of the end plate.

[0045] (Configuration 3) The rotor structure of a rotating electric machine according to Configuration 1 or 2, wherein the magnet housing section houses the magnets along an inclination angle that is further away from the rotor radial direction than the straight line extending from the rotor axis in the rotor radial direction when viewed in the rotor axial direction, and has gaps between the magnets that penetrate in the rotor axial direction, and the gaps do not overlap with the end plate in the rotor axial direction.

[0046] (Configuration 4) A rotor structure for a rotating electric machine according to any one of Configurations 1 to 3, wherein the end plate has an opening that penetrates in the direction of the rotor axis and the rotor has a connecting passage that penetrates in the direction of the rotor axis, and the opening and the connecting passage overlap in the direction of the rotor axis. With this configuration, the opening of the end plate and the connecting passage of the rotor overlap, allowing cooling air or oil to flow through the opening and the connecting passage. Therefore, the cooling efficiency of the rotor can be increased and the temperature rise of the rotor structure can be suppressed.

[0047] (Configuration 5) The rotor structure of a rotating electric machine according to any one of Configurations 1 to 4, wherein the end plate has recesses spaced apart in the circumferential direction of the rotor, and in a view in the direction of the rotor axis, the portion of each recess of the end plate that overlaps with the magnet is formed into a curved portion that protrudes outward in the direction of the rotor diameter, and the portion between each curved portion that constitutes the space between each recess of the end plate is located inward in the direction of the rotor diameter from the outer end of the magnet in the direction of the rotor diameter. With this configuration, the curved portion reduces the overlap between the end plate and the magnet in a view in the direction of the rotor axis, and more of the magnet can be exposed. Therefore, the rotor structure can be cooled efficiently and the temperature rise of the rotor structure can be suppressed. In addition, the end plate can be made smaller and lighter while preventing the magnet from protruding in the direction of the rotor diameter.

[0048] (Configuration 6) The rotor is provided with a magnet pressing portion that extends from the outer side in the rotor radial direction of the magnet toward the inner side, a second cooling gap is provided between the magnet pressing portion and the magnet, and at least a part of the second cooling gap does not overlap with the end plate when viewed in the rotor axial direction. The rotor structure of a rotary electric machine according to any one of Configurations 1 to 5. According to this configuration, by providing the second cooling gap at a position that does not overlap with the end plate, cooling air or oil can flow through the second cooling gap. Therefore, cooling efficiency can be improved, and temperature rise of the rotor structure can be suppressed.

[0049] (Configuration 7) The end plate is a non-magnetic material. The rotor structure of a rotary electric machine according to any one of Configurations 1 to 6. According to this configuration, by using a non-magnetic end plate, eddy current generated between the end plate and the magnet can be reduced. Therefore, heat generation on the rotor side can be suppressed, and temperature rise of the rotor structure can be suppressed.

[0050] 10 Rotor 13 Communication passage 14 Magnet housing portion 16a Gap 17 Magnet 19 Magnet pressing portion 30 End plate 31 Recessed portion 31a Corner portion (curved portion) 33 Opening portion C Rotor axis (axis of rotor, axis) L1 Straight line

Claims

1. A rotor structure for a rotating electric machine comprising a rotor (10) provided with a magnet housing portion (14) for housing a magnet (17), and an end plate (30) that suppresses the movement of the magnet (17) in the direction of the rotor axis, wherein the end plate (30) has a recess (31) on its outer circumference that is recessed inward in the direction of the rotor diameter, and in a view in the direction of the rotor axis, the recess (31) overlaps with a part of the magnet (17).

2. The rotor structure of a rotating electric machine according to claim 1, wherein the magnet (17) is arranged along an inclination angle that is further away from the rotor radially outward with respect to a straight line (L1) extending in the rotor radial direction from the axis (C) of the rotor (10) when viewed in the direction of the rotor axis, and the recess (31) is shaped in accordance with the arrangement of the magnet (17).

3. The magnet housing portion (14), when viewed in the direction of the rotor axis, houses the magnets (17) along an inclination angle that is further away from the straight line (L1) extending radially from the axis (C) of the rotor (10) towards the outer side of the rotor radial direction, and has a gap (16a) between the magnets (17) that penetrates in the direction of the rotor axis, and the gap (16a) does not overlap with the end plate (30) in the direction of the rotor axis, the rotor structure of a rotating electric machine according to claim 1.

4. The rotor structure of a rotating electric machine according to claim 1, having an opening (33) that penetrates the end plate (30) in the direction of the rotor axis and a connecting passage (13) that penetrates the rotor (10) in the direction of the rotor axis, wherein the opening (33) and the connecting passage (13) overlap in the direction of the rotor axis.

5. The rotor structure of a rotating electric machine according to claim 2, wherein the end plate (30) has recesses (31) spaced apart in the circumferential direction of the rotor, and in a view in the direction of the rotor axis, the portion of each recess (31) of the end plate (30) that overlaps with the magnet (17) is formed as a curved portion (31a) that protrudes outward in the radial direction of the rotor, and the portion between each curved portion (31a) that constitutes the space between each recess (31) of the end plate (30) is located inward in the radial direction of the rotor from the outer end of the magnet (17) in the radial direction of the rotor.

6. The rotor (10) is provided with a magnet retaining portion (19) extending from the outer side in the radial direction of the rotor toward the inner side of the magnet (17), a second cooling gap (16a) is provided between the magnet retaining portion (19) and the magnet (17), and at least a portion of the second cooling gap (16a) does not overlap with the end plate (30) when viewed in the direction of the rotor axis, the rotor structure of the rotating electric machine according to claim 1.

7. The rotor structure of a rotating electric machine according to any one of claims 1 to 6, wherein the end plate (30) is made of a non-magnetic material.

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