Rotating electric machine

Abstract

To provide a rotating electric machine that can properly fix a permanent magnet without affecting the magnetic circuit of the permanent magnet. [Solution] A rotating electric machine equipped with a rotor in which permanent magnets are embedded. The rotor comprises a rotor core having magnet holes formed along the axial direction, and permanent magnets inserted into the magnet holes. The magnet holes are formed such that, in an axial view, their inner circumference is in close contact with the first surface on the outer diameter side of the permanent magnets. A separate core made of the same material as the rotor core is placed between the second surface on the inner diameter side of the permanent magnets and the inner surface of the magnet holes facing the second surface, and the separate core is in close contact with the second surface of the permanent magnets.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine.

Background Art

[0002] Patent Document 1 discloses a rotor of a rotating electrical machine in which a pin-shaped member is inserted into a through-hole formed on the radially inner side of a permanent magnet inserted into a rotor core to plastically deform the rotor core and caulking-fix the permanent magnet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] In the rotor described in Patent Document 1, there is a problem that a process and separate parts for plastically deforming the rotor core are required, increasing the cost of manufacturing the rotor. Instead of caulking-fixing the permanent magnet, it is also possible to fix it using an adhesive, but in this case, since an adhesive, which is a non-magnetic material, intervenes between the permanent magnet and the rotor core, it affects the magnetic circuit of the permanent magnet.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a rotating electrical machine that can appropriately fix a permanent magnet without affecting the magnetic circuit of the permanent magnet.

[0006] According to an aspect of the present invention, it is applied to a rotating electrical machine provided with a rotor. The rotor includes a rotor core having magnet holes formed along the axial direction of the rotor, a permanent magnet inserted into the magnet holes, and a separate core made of the same material as the rotor core inserted into the magnet holes and arranged to be in close contact with the permanent magnet on the inner diameter side of the permanent magnet. In an axial view, the first surface on the outer diameter side of the permanent magnet is in close contact with the inner peripheral surface of the magnet hole by magnetic force, and the second surface on the inner diameter side is in close contact with the outer peripheral surface of the separate core by magnetic force.

[0007] According to the present invention, since the magnet hole in which the separate core is not placed is sufficiently large relative to the radial thickness of the permanent magnet, the permanent magnet can be easily inserted into the magnet hole. Furthermore, because the magnetic force of the permanent magnet causes the rotor core and the separate core, which are core components, to be in close contact with the permanent magnet without any gaps, it is possible to properly fix the permanent magnet in the magnet hole without affecting the magnetic circuit of the permanent magnet. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view of the main part of a rotor core according to an embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the main part of a modified rotor core. [Figure 3] Figure 3 is a cross-sectional view of the main part of another modified rotor core. [Figure 4] Figure 4 is a cross-sectional view of the main part of another modified rotor core. [Figure 5] Figure 5 is a cross-sectional view of the main part of another modified rotor core. [Figure 6] Figure 6 is a cross-sectional view of the main part of another modified rotor core. [Figure 7] Figure 7 is a cross-sectional view of the main part of another modified rotor core. [Figure 8] Figure 8 is a cross-sectional view of the main part of another modified rotor core. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings and other documents.

[0010] Figure 1 is a cross-sectional view perpendicular to the axial direction of the rotor 10 in a rotating electric machine according to an embodiment of the present invention.

[0011] As shown in Figure 1, the rotating electric machine of this embodiment is configured to include a rotor 10 that is concentric with a ring-shaped stator (not shown) and rotatably arranged via an air gap, and a rotating shaft 15 that passes through the center of the rotor 10.

[0012] Rotating electric machines are mounted on electric vehicles and function as electric motors that drive the wheels. They may also be used in devices other than automobiles, such as drive systems or power generators for various electrical equipment or industrial machinery.

[0013] The rotor 10 consists of a rotor core 12 and permanent magnets 30 inserted into magnet holes 11 formed in the rotor core 12. A rotating shaft 15 is fixed to the center of the rotor core 12. The rotor core 12 is a core member formed by laminating electromagnetic steel sheets punched into predetermined shapes. The magnet holes 11 are formed along the axial direction of the rotor core 12 and penetrate the rotor core 12.

[0014] On the rotor 10, magnetic poles 35, each composed of a permanent magnet 30, are arranged at predetermined intervals in the circumferential direction. In the configuration shown in Figure 1, one permanent magnet 30 constitutes one magnetic pole 35, and an example is shown where eight magnetic poles 35 are arranged in the circumferential direction. The magnetic center d-axis of each magnetic pole 35 is set at its center, and adjacent magnetic poles 35 are separated by the q-axis, which is magnetically perpendicular to the d-axis.

[0015] The permanent magnet 30 is positioned symmetrically with respect to the d-axis, such that, in an axial view of the rotor 10, its shape is rectangular and its longer side is perpendicular to the d-axis. The permanent magnet 30 is fixed within the magnet hole 11 formed in the rotor core 12.

[0016] The magnet hole 11 is a rectangular hole that penetrates the rotor core 12 in the axial direction. The circumferential width of the magnet hole 11 is formed to be substantially the same as the longitudinal width of the permanent magnet 30. The first surface 11a on the outer diameter side of the inner circumferential surface of the magnet hole 11 is in close contact with the first surface 30a on the outer diameter side of the permanent magnet 30. The second surface 30b on the inner diameter side of the permanent magnet 30 does not closely contact the second surface 11b on the inner circumferential side of the magnet hole 11. Therefore, a gap is formed between the second surface 11b of the magnet hole 11 and the second surface 30b of the permanent magnet 30, and a separate core 19 is disposed in this gap.

[0017] The separate core 19 is a core member formed by laminating electromagnetic steel sheets punched into a predetermined shape similar to the rotor core 12. The radially outer surface of the separate core 19 contacts the second surface 30b of the permanent magnet 30, both circumferential side surfaces thereof contact both side surfaces of the magnet hole 11, and its radially inner surface is disposed at a position having a gap with respect to the second surface 11b of the magnet hole 11.

[0018] In the present embodiment, both circumferential side surfaces (the third surface 30c and the fourth surface 30d) of the permanent magnet 30 and both side surfaces (the third surface 11c and the fourth surface 11d) of the magnet hole 11 are configured to be in close contact, but a gap (flux barrier) may be provided between the width direction end portions of the permanent magnet 30 and the third surface 11c and the fourth surface 11d of the magnet hole 11.

[0019] Since the permanent magnet 30 has a magnetic force, it adheres to the magnetic rotor core 12 by the magnetic force. Therefore, the permanent magnet 30 adheres to the inner circumferential surface of the magnet hole 11 by the magnetic force. That is, in a state where the permanent magnet 30 is inserted into the magnet hole 11, the first surface 30a of the permanent magnet 30 and the first surface 11a of the magnet hole 11 are in close contact by the magnetic force, and the second surface 30b of the permanent magnet 30 and the outer circumferential surface of the separate core 19 are in close contact by the magnetic force.

[0020] With such a configuration, positioning of the permanent magnet 30 in the magnet hole 11, particularly positioning in the radial direction, becomes easy.

[0021] More specifically, the magnet hole 11 where the separate core 19 is not arranged is sufficiently larger than the radial thickness of the permanent magnet 30. Therefore, the permanent magnet 30 can be easily inserted into the magnet hole 11. When the permanent magnet 30 is inserted into the magnet hole 11, due to the magnetic force of the permanent magnet 30, the first surface 30a of the permanent magnet 30 adheres closely to the first surface 11a of the magnet hole 11. Then, by inserting the separate core 19 between the second surface 11b of the magnet hole 11 and the second surface 30b of the permanent magnet 30, the separate core 19 adheres closely to the second surface 30b of the permanent magnet 30 due to the magnetic force of the permanent magnet 30.

[0022] In this way, since the separate core 19 adheres closely to the permanent magnet 30 without any gaps due to the magnetic force, it does not affect the magnetic circuit of the permanent magnet 30 in the rotor 10. Furthermore, an adhesive for fixing the permanent magnet 30 and a working process for caulking the permanent magnet 30 are not required.

[0023] In the embodiment described above, a rotating electric machine includes a rotor 10. The rotor 10 includes a rotor core 12 having a magnet hole 11 formed along the axial direction of the rotor 10, a permanent magnet 30 inserted into the magnet hole 11, and a separate core 19 made of the same material as the rotor core 12, which is inserted into the magnet hole 11 and arranged to adhere closely to the permanent magnet 30 on the inner diameter side of the permanent magnet 30. In the axial view, the first surface 30a on the outer diameter side of the permanent magnet 30 adheres closely to the first surface 11a on the inner circumference of the magnet hole 11 due to the magnetic force, and the second surface 30b on the inner diameter side adheres closely to the outer circumferential surface of the separate core 19 due to the magnetic force.

[0024] In this configuration, the magnet hole 11, where the separate core 19 is not located, is sufficiently large relative to the radial thickness of the permanent magnet 30, allowing the permanent magnet 30 to be easily inserted into the magnet hole 11. Furthermore, the magnetic force of the permanent magnet 30 ensures that the rotor core 12 and the separate core 19, which are core components, are in close contact with the permanent magnet 30 without any gaps, thus securely fixing the permanent magnet 30 to the rotor core 12. This makes it possible to properly fix the permanent magnet 30 within the magnet hole 11 without affecting the magnetic circuit of the permanent magnet 30. When the rotor 10 rotates, centrifugal force biases the permanent magnet 30 to be in closer contact with the rotor core 12 and the separate core 19. Alternatively, the separate core 19 may be fixed by filling the gap between the separate core 19 and the second surface 11b of the magnet hole 11 with adhesive or the like.

[0025] Furthermore, in this embodiment, the permanent magnet 30 has a rectangular shape in an axial view, with the first surface 30a on the outer diameter side in close contact with the first surface 11a on the outer diameter side of the magnet hole 11, and the second surface 30b of the permanent magnet 30 in close contact with the outer peripheral surface on the outer diameter side of the separate core 19.

[0026] In this configuration, the rotor core 12 and the separate core 19, which are core components, can be easily brought into close contact with the rectangular permanent magnet 30. That is, since the magnet hole 11 has the same width in the radial direction, the separate core 19 can easily move and come into close contact with the permanent magnet 30.

[0027] Next, a modified example of this embodiment will be described with reference to the figures. Figure 2 is a cross-sectional view of the rotor 10 of the modified example of this embodiment, perpendicular to the axial direction.

[0028] The modified example shown in Figure 2 illustrates an example where the magnetic pole 35 is composed of two permanent magnets 30 (a first permanent magnet 31 and a second permanent magnet 32).

[0029] The two permanent magnets 31 and 32 are positioned symmetrically with respect to the d-axis. The first permanent magnet 31 is positioned to the left of the d-axis in the circumferential direction (towards the direction of rotation) in Figure 2, and is tilted with respect to the d-axis so that it approaches the d-axis as it approaches the outer diameter. The second permanent magnet 32 ​​is positioned to the right of the d-axis in the circumferential direction (opposite side of the direction of rotation) in Figure 2, and is tilted with respect to the d-axis so that it approaches the d-axis as it approaches the outer diameter. In other words, the first permanent magnet 31 and the second permanent magnet 32 ​​are positioned so that they move further apart from each other as they move towards the inner diameter with respect to the d-axis.

[0030] The magnet hole 11 is formed in a substantially trapezoidal shape with the d-axis as the center, where the circumferential length of the second surface 11b on the inner diameter side is greater than the circumferential length of the first surface 11a on the outer diameter side, and the third surface 11c and fourth surface 11d on the sides are inclined with respect to the d-axis. The first surface 31a on the outer diameter side of the first permanent magnet 31 is in close contact with the third surface 11c of the magnet hole 11. The first surface 30a of the second permanent magnet 32 ​​is in close contact with the fourth surface 11d of the magnet hole 11. A separate core 19 is positioned so as to be in close contact with the second surface 31b on the inner diameter side of the first permanent magnet 31 and the second surface 32b of the second permanent magnet 32.

[0031] The separate core 19 has a trapezoidal shape so as to be inscribed within the magnet hole 11, in relation to the first permanent magnet 31 and the second permanent magnet 32, respectively. That is, the separate core 19 has its circumferential surfaces, the third surface 19c and the fourth surface 19d, inclined so as to be in close contact with the second surface 31b of the first permanent magnet 31 and the second surface 32b of the second permanent magnet 32, which are arranged at an inclination. On the other hand, the first surface 19a on the outer diameter side and the second surface 19b on the inner diameter side are formed parallel to the first surface 11a and the second surface 11b of the magnet hole 11, respectively.

[0032] In this modified example, the permanent magnet 30 consists of a first permanent magnet 31 and a second permanent magnet 32, which are rectangular in shape when viewed in the axial direction. The first permanent magnet 31 and the second permanent magnet 32 ​​are arranged symmetrically with respect to the d-axis, which is the center of the magnetic pole 35, and are spaced further apart from each other as they move toward the inner diameter. A separate core 19 is positioned between the second surface 31b on the inner diameter side of the first permanent magnet 31 and the second surface 32b on the inner diameter side of the second permanent magnet 32, and the inner surface of the magnet hole 11 located further inward than these second surfaces. The separate core 19 is trapezoidal in shape and is in close contact with the second surface 31b on the inner diameter side of the first permanent magnet 31 and the second surface 32b on the inner diameter side of the second permanent magnet 32, respectively.

[0033] Thus, when one magnetic pole 35 is composed of two permanent magnets 30, by arranging the separate core 19 so as to be in close contact with the second surfaces 31b and 32b of the two permanent magnets 31 and 32, it becomes possible to properly fix the permanent magnets 30 in the magnet hole 11 without affecting the magnetic circuit of the permanent magnets 30, similar to the configuration in Figure 1 described above.

[0034] Figure 3 is a cross-sectional view perpendicular to the axial direction of the rotor 10 of another modified example of this embodiment.

[0035] The modified example shown in Figure 3 illustrates an example in which the permanent magnet 30 placed on the magnetic pole 35 has an arc shape that bulges outwards on the outer diameter side.

[0036] In an axial view of the rotor 10, the first surface 30a on the outer diameter side and the second surface 30b on the inner diameter side are curved arcs that curve toward the outer diameter side. In addition, both end faces (third surface 30c, fourth surface 30d) of the permanent magnet 30 are composed of surfaces perpendicular to the d-axis.

[0037] Of the inner circumferential surfaces of the magnet hole 11, the first surface 11a on the outer diameter side has an arc shape corresponding to the first surface 30a of the permanent magnet 30. The second surface 11b on the inner circumferential side of the magnet hole 11 does not directly contact the second surface 30b on the inner diameter side of the permanent magnet 30, and there is a gap between them.

[0038] The separate core 19 is in close contact with the second surface 30b of the permanent magnet 30 without any gaps. The first surface 19a on the outer diameter side of the separate core 19 has an arc shape corresponding to the first surface 30a, the third surface 30c, and the fourth surface 30d of the permanent magnet 30, and is in close contact with the inner diameter side of the permanent magnet 30.

[0039] In this way, by giving the permanent magnet 30 an arc shape that bulges outwards, the magnetic flux acting on the opposing stator approaches a sine wave, thereby reducing harmonic components and suppressing torque ripple. Even with this configuration, it is possible to properly fix the permanent magnet 30 in the magnet hole 11 without affecting the magnetic circuit of the permanent magnet 30.

[0040] Figure 4 is a cross-sectional view perpendicular to the axial direction of the rotor 10 of yet another modification of this embodiment.

[0041] The configuration shown in Figure 4 is a modified version of the configuration shown in Figure 3, and shows an example in which the permanent magnet 30 has an arc shape that bulges outwards on the inner diameter side.

[0042] When the permanent magnet 30 has an arc shape that bulges inward in this way, the first surface 11a on the outer diameter side of the magnet hole 11 has an arc shape that corresponds to the first surface 30a, third surface 30c, and fourth surface 30d of the permanent magnet 30 that curve inward. The first surface 19a on the radially outer side of the separate core 19 has an arc shape that corresponds to the first surface 30a of the permanent magnet 30 that curves inward.

[0043] In this way, by giving the permanent magnet 30 an arc shape that bulges inward, the magnetic flux acting on the opposing stator approaches a sine wave, thereby reducing harmonic components and suppressing torque ripple. Even with this configuration, it is possible to properly fix the permanent magnet 30 in the magnet hole 11 without affecting the magnetic circuit of the permanent magnet 30.

[0044] Figure 5 is a cross-sectional view perpendicular to the axial direction of the rotor 10 of yet another modification of this embodiment.

[0045] The configuration shown in Figure 5 illustrates an example in which the magnetic pole 35 is composed of two arc-shaped permanent magnets 30 (third permanent magnet 33 and fourth permanent magnet 34).

[0046] The third permanent magnet 33 and the fourth permanent magnet 34 both have an arc shape that curves outward, as explained in Figure 3. The two permanent magnets 33 and 34 are arranged opposite each other and overlap radially with respect to the d-axis. The fourth permanent magnet 34 is positioned on the inner diameter side of the third permanent magnet 33. Two separate cores 19 (first separate core 191 and second separate core 192) are placed in the magnet hole 11.

[0047] A first separate core 191 is positioned between the third permanent magnet 33 and the fourth permanent magnet 34. The first separate core 191 is shaped to fill the gap between them and is in close contact with the second surface 33b of the third permanent magnet 33 and the first surface 34a of the fourth permanent magnet 34 without any gaps.

[0048] The second separate core 192 is in close contact with the second surface 33b of the third permanent magnet 33 without any gaps.

[0049] In this modified example, the permanent magnet 30 consists of a third permanent magnet 33 and a fourth permanent magnet 34, the third permanent magnet 33 and the fourth permanent magnet 34 being substantially identical in shape and arranged in a stack in the radial direction. A first separate core 191 and a second separate core 192 are positioned between the third permanent magnet 33 and the fourth permanent magnet 34, and on the inner diameter side of the fourth permanent magnet 34, respectively.

[0050] According to this modified example, by arranging two arc-shaped permanent magnets 30 in parallel in the radial direction, the magnetic flux density at the magnetic poles 35 can be increased, thereby increasing the torque of the rotating electric machine. Even with this configuration, by making the magnet holes 11 and the separate core 19 the same shape as the permanent magnets 30, the core members can be tightly attached to the permanent magnets 30 without any gaps.

[0051] Figure 6 is a cross-sectional view perpendicular to the axial direction of the rotor 10 of yet another modification of this embodiment.

[0052] The configuration shown in Figure 6 is a modified version of the configuration shown in Figure 5, and shows an example in which two arc-shaped permanent magnets 30 (third permanent magnet 33, fourth permanent magnet 34) are curved toward the inner diameter.

[0053] Even with this configuration, as explained in Figure 5, a first separate core 191 is placed between the third permanent magnet 33 and the fourth permanent magnet 34 to fill the gap between them, and a second separate core 192 is placed on the second surface 33b of the third permanent magnet 33.

[0054] In this modified example as well, the magnetic flux density at the magnetic pole 35 can be increased to increase the torque of the rotating electric machine. Even with this configuration, by shaping the magnet hole 11 and the separate core 19 to correspond to the permanent magnet 30, the core member can be tightly attached to the permanent magnet 30 without any gaps.

[0055] Figure 7 is a cross-sectional view perpendicular to the axial direction of the rotor 10 of yet another modification of this embodiment.

[0056] The configuration shown in Figure 7 is a modified version of the configuration shown in Figure 1, and is characterized by the separate core 19 having a non-contact portion 21. The other configurations are the same as those described in Figure 1.

[0057] In the separate core 19, non-contact portions 21 (21a, 21b) that do not come into contact with the permanent magnet 30 are formed along the axial direction of the separate core 19 at the locations where they would otherwise be in contact with the circumferential magnet ends of the permanent magnet 30. The non-contact portions 21 are formed by cutting out the separate core 19 along the axial direction near the magnet ends of the permanent magnet 30.

[0058] The non-contact portion 21a is provided at a location adjacent to the angle formed by the second surface 30b and the third surface 30c of the permanent magnet 30, and the non-contact portion 21b is provided at a location adjacent to the angle formed by the second surface 30b and the fourth surface 30d of the permanent magnet 30. In the configuration of Figure 8, the magnet hole 11 is open to the outside of the rotor core 12 near the d-axis, but the magnet hole 11 may be an independent hole, as in the configuration of Figure 2. Also, in the configuration of Figure 2, the magnet hole 11 may be open to the outside of the rotor core 12 near the d-axis.

[0059] In this way, by providing a non-contact portion 21 between the magnetic end of the permanent magnet 30 and the separate core 19 (core member), the magnetic flux of the stator acting on the magnetic end of the permanent magnet 30 is suppressed, making it possible to suppress irreversible demagnetization of the permanent magnet 30 that occurs at this location.

[0060] Figure 8 is a cross-sectional view perpendicular to the axial direction of the rotor 10 of yet another modification of this embodiment.

[0061] The configuration shown in Figure 8 is a modified version of the configuration shown in Figure 2, and is characterized by the separate core 19 having non-contact portions 22 and 23. The other configurations are the same as those described in Figure 2.

[0062] Similar to the configuration described in Figure 7, non-contact portions 22 (22a, 22b) are formed at the location where the magnet end of the first permanent magnet 31 and the separate core 19 come into contact, and non-contact portions 23 (23a, 23b) are formed at the location where the magnet end of the second permanent magnet 32 ​​comes into contact with the separate core 19.

[0063] Thus, even when the magnetic pole 35 is composed of multiple permanent magnets 30, by providing a non-contact area between the magnetic ends of the permanent magnets 30 and the separate core 19 (core member), the magnetic flux of the stator acting on the magnetic ends of the permanent magnets 30 is suppressed, making it possible to suppress irreversible demagnetization of the permanent magnets 30 that occurs at this location.

[0064] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0065] In this embodiment, the permanent magnet 30 is inserted into the magnet hole 11, and its magnetic force causes it to adhere closely to the inner circumference of the magnet hole 11 and the separate core 19. However, the permanent magnet 30 may be inserted into the magnet hole 11 together with the separate core 19 before magnetization, and then magnetized. [Explanation of Symbols]

[0066] 10: Rotor, 11: Magnet hole, 11a: First surface, 11b: Second surface, 12: Rotor core, 19: Separate core, 19a: First surface, 19b: Second surface, 21: Non-contact part, 30: Permanent magnet, 30a: First surface, 30b: Second surface, 31: First permanent magnet, 32: Second permanent magnet, 33: Third permanent magnet, 34: Fourth permanent magnet, 191: First separate core, 192: Second separate core.

Claims

1. A rotating electric machine equipped with a rotor, The rotor is A rotor core having magnetic holes formed along the axial direction of the rotor, A permanent magnet inserted into the aforementioned magnet hole, The rotor comprises a separate core made of the same material as the rotor core, which is inserted into the magnet hole and positioned so as to be in close contact with the permanent magnet on the inner diameter side of the permanent magnet, In an axial view, the first surface of the permanent magnet on the outer diameter side is in close contact with the inner circumferential surface of the magnet hole by magnetic force, and the second surface on the inner diameter side is in close contact with the outer circumferential surface of the separate core by magnetic force. Rotating electric machine.

2. A rotating electric machine according to claim 1, The permanent magnet has a rectangular shape in an axial view, with the first surface in close contact with the inner circumferential surface on the outer diameter side of the magnet hole, and the second surface in close contact with the outer circumferential surface on the outer diameter side of the separate core. Rotating electric machine.

3. A rotating electric machine according to claim 1, The aforementioned permanent magnet consists of a first permanent magnet and a second permanent magnet, both having a rectangular shape when viewed in the axial direction. The first permanent magnet and the second permanent magnet are arranged symmetrically with respect to the d-axis, which is the magnetic pole center of the permanent magnet, and are spaced further apart from each other as they move toward the inner diameter. The separate core is positioned between the second surface on the inner diameter side of the first permanent magnet and the second surface on the inner diameter side of the second permanent magnet, and the inner surface of the magnet hole located on the inner diameter side of the second surface. The separate core has a trapezoidal shape and is in close contact with the second surface of the first permanent magnet and the second surface of the second permanent magnet, respectively. Rotating electric machine.

4. A rotating electric machine according to claim 1, The aforementioned permanent magnet has an arc shape that bulges outwards in an axial view. Rotating electric machine.

5. A rotating electric machine according to claim 1, The aforementioned permanent magnet has an arc shape that bulges inward when viewed in the axial direction. Rotating electric machine.

6. A rotating electric machine according to claim 4 or 5, The aforementioned permanent magnet consists of a third permanent magnet and a fourth permanent magnet. The third permanent magnet and the fourth permanent magnet are substantially the same shape and are arranged in a stack in the radial direction. The separate core is positioned between the third permanent magnet and the fourth permanent magnet, and on the second surface on the inner diameter side of the fourth permanent magnet, respectively. Rotating electric machine.

7. A rotating electric machine according to claim 1, The aforementioned permanent magnet has a rectangular shape when viewed in the axial direction. The separate core has a non-contact portion that does not come into contact with the longitudinal end of the permanent magnet. Rotating electric machine.

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