Rotor for rotary electric machine and rotary electric machine

Abstract

The purpose of the present invention is to provide: a rotor for a rotary electric machine, the rotor being capable of reducing torque ripple while suppressing a decrease in maximum torque; and a rotary electric machine. This rotor 3 comprises a rotor core 31 having: magnets; magnet insertion holes into which the magnets are inserted; and flux barriers provided around the magnets. The magnets include: first magnets 32; and second magnets 33 that are arranged in roughly a V-shape inwardly of the first magnets 32 in the radial direction. The flux barriers include: first flux barriers 34a that face the side surfaces 33a of the second magnets 33 at the outer sides thereof in the radial direction; and second flux barriers 34b that are arranged outwardly of the first flux barriers 34a in the radial direction. Each second flux barrier 34b comprises: a first side 34b1 which follows an outer peripheral surface tangent line TL of the rotor core 31; and a second side 34b2 which is located inwardly of the first side 34b1 in the radial direction and of which at least a part is formed along a side 34a1 of the first flux barrier 34a at the outer side thereof in the radial direction.

Description

Rotor of rotating electric machine and rotating electric machine

[0001] The present invention relates to a rotor for a rotating electric machine and a rotating electric machine.

[0002] The abstract of Patent Document 1 describes a rotor having a flux barrier that communicates with a mounting hole in which a permanent magnet is embedded. The flux barrier is formed with a partition that divides the interior of the flux barrier into multiple regions (resin-filled regions and gaps) along the axial direction. Furthermore, paragraph 0034 and Figure 3 of Patent Document 1 describe a configuration in which both ends of the partition are connected to the inner wall on the outer periphery. When viewed from the axial direction of the rotor, the partition has an arc shape that bulges toward the permanent magnet, and is formed so that the outer periphery facing the end of the permanent magnet is larger.

[0003] JP 2014-212589 A

[0004] In the rotor of Patent Document 1, the flux barrier reduces the short-circuit magnetic flux of the permanent magnet. Furthermore, because the flux barrier is partitioned by a partition into a resin-filled portion and a gap, the amount of resin material required for the resin-filled portion can be reduced. As a result, the rotor of Patent Document 1 can achieve both reduced manufacturing costs by reducing the amount of resin material and improved performance by providing a flux barrier. However, Patent Document 1 does not give sufficient consideration to reducing torque ripple, and the partition does not contribute to reducing torque ripple.

[0005] Furthermore, in a rotating electrical machine, there is a trade-off between maximum torque and torque ripple, so reducing torque ripple while maintaining maximum torque has been a major challenge.

[0006] An object of the present invention is to provide a rotor for a rotating electric machine and a rotating electric machine that can reduce torque ripple while suppressing a decrease in maximum torque by utilizing a partition (bridge) between two flux barriers.

[0007] In order to achieve the above object, the stator of the rotating electric machine of the present invention is a rotor of a rotating electric machine comprising a rotor core having a magnet, a magnet insertion hole into which the magnet is inserted, and a flux barrier provided around the magnet, wherein the magnet includes a first magnet and a second magnet arranged in an approximately V-shape radially inward of the first magnet, and the flux barrier includes a first flux barrier facing the radially outer side surface of the second magnet and a second flux barrier arranged radially outward of the first flux barrier, and the second flux barrier has a first edge along the outer circumferential tangent line of the rotor core, and a second edge located radially inward from the first edge, at least a portion of which is formed along the radially outer edge of the first flux barrier.

[0008] According to the present invention, it is possible to provide a rotor for a rotating electric machine and a rotating electric machine that can reduce torque ripple while suppressing a decrease in maximum torque by utilizing a partition (bridge) between two flux barriers. Objects, configurations, and effects other than those described above will become clear from the following description of the embodiment of the invention.

[0009] 1. A perspective view showing a rotating electric machine according to an embodiment of the present invention. 2. A plan view showing an enlarged portion of a rotor according to an embodiment of the present invention. 3. An enlarged view of part III of FIG. 2. 4. A plan view showing an enlarged portion of a rotor according to an embodiment of the present invention. 5. A diagram for explaining the effects of the present invention, comparing the present invention with a conventional example in terms of changes in torque relative to the rotation angle of the rotor. 6. A plan view showing an enlarged portion of a rotor according to a first comparative example to the present invention. 7. A diagram for explaining the effects of the present invention, comparing the present invention with the first comparative example in terms of changes in torque relative to the rotation angle of the rotor. 8. A plan view showing an enlarged portion of a rotor according to a second comparative example to the present invention. 9. A diagram for explaining the effects of the present invention, comparing the present invention with the second comparative example in terms of changes in torque relative to the rotation angle of the rotor. 10. A diagram extracted from FIG. 9. 11. A plan view showing an enlarged portion of a rotor according to a third comparative example to the present invention. 12. A diagram for explaining the effects of the present invention, comparing the present invention with the third comparative example in terms of changes in torque relative to the rotation angle of the rotor. 13. A diagram extracted from FIG. 12.

[0010] In the following description, the same reference numerals are used to designate similar components in each drawing to avoid duplication of explanation. In addition, when there are differences between components with the same reference numerals, the differences will be explained.

[0011] A rotating electric machine 1 according to an embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a perspective view showing the rotating electric machine 1 according to an embodiment of the present invention. A dashed-dotted line 38a represents the central axis (shaft center) of a rotating shaft (not shown).

[0012] In the following description, the direction along the central axis 38a of the rotating shaft will be referred to as the "axial direction." Furthermore, the terms "circumferential direction" and "radial direction" refer to the "circumferential direction" and "radial direction" of the rotating electric machine (stator core, rotor core) unless otherwise specified.

[0013] The rotating electric machine 1 has a stator 2 and a rotor 3. In this embodiment, an inner-rotor type rotating electric machine 1 in which the rotor 3 is disposed on the inner circumferential side of the stator 2 will be described.

[0014] The stator 2 has a stator core 21. The stator core 21 has teeth 22 arranged at intervals in the circumferential direction, slots 23 formed between adjacent teeth 22, and a yoke 24. The yoke 24 forms the outer periphery of the stator core 21, and the teeth 22 are provided so as to protrude from the yoke 24 toward the inner periphery.

[0015] The stator core 21 is accommodated in and supported by a housing (not shown). The stator 2 is arranged so that its inner peripheral surface (the tip surfaces of the teeth 22) faces the outer peripheral surface of the rotor core 31. A gap G is provided between the inner peripheral surface of the stator core 21 and the outer peripheral surface of the rotor core 31.

[0016] Coils (not shown) are wound in the slots 22 of adjacent stator cores 21. A portion of the coil is inserted into a slot 23, and the portion exposed outside the slot 23 constitutes a coil end portion.

[0017] The rotor 3 includes a rotor core 31, magnets (permanent magnets) 32 and 33 that form magnetic poles, and a rotating shaft (not shown). The rotor core 31 is appropriately provided with through holes 34 that penetrate in the axial direction to reduce weight.

[0018] The rotor 3 will be described with reference to Figures 2 and 3. Figure 2 is an enlarged plan view of a portion of the rotor 3 according to one embodiment of the present invention. Figure 3 is an enlarged view of part III in Figure 2. Note that Figure 2 also includes an enlarged view of part III enclosed in a dotted square. Figures 2 and 3 illustrate the configuration as seen from an end face or cross section perpendicular to the central axis 38a of the rotating shaft, and the following description will be based on the configuration illustrated in these figures.

[0019] As shown in FIG. 2 , the rotor 3 of this embodiment includes a rotor core 31 having magnets 32 and 33, magnet insertion holes 35 and 36 into which the magnets 32 and 33 are inserted, and flux barriers 34 a, 34 b, and 34 c provided around the magnets 32 and 33. The magnets 32 and 33 include a first magnet 32 ​​and a second magnet 33 arranged radially inward of the first magnet 32 ​​in a substantially V-shape. The second magnets 33 are arranged symmetrically across the d-axis. In this case, the second magnets 33 are arranged inclined with respect to the d-axis so that the end 33 a on the q-axis side is located closer to the outer circumferential surface of the rotor core 31 than the end 33 b on the d-axis side. The term "substantially V-shaped" refers to this arrangement. In this embodiment, the magnets 32 and 33 are also arranged in a substantially V-shape, similar to the magnets 33.

[0020] The end 33a on the q-axis side and the end 33b on the d-axis side of the second magnet 33 have side surfaces that connect the two magnetic pole faces 33c of the second magnet 33. The end 33a on the q-axis side forms the radially outer side surface, and the end 33b on the d-axis side forms the radially inner side surface.

[0021] The magnet insertion holes 35, 36 include a first magnet hole 35 into which the first magnet 32 ​​is inserted and a second magnet hole 36 into which the second magnet 33 is inserted.

[0022] The flux barriers 34a, 34b, 34c include a first flux barrier 34a facing the radially outer side surface 33a of the second magnet 33, a second flux barrier 34b arranged radially outward of the first flux barrier 34a, and a third flux barrier 34c provided around the second magnet 33. The first flux barrier 34a and the second flux barrier 34b are provided around the first magnet 32.

[0023] The second flux barrier 34b includes a first side 34b1 that is aligned with a tangent line TL to the outer peripheral surface 31a of the rotor core 31, and a second side 34b2 that is positioned radially inward from the first side 34b1 and that at least a portion of which is formed along the radially outer side 34a1 of the first flux barrier 34a. When a central angle θ34b1 defined by two radii passing through both ends of the first side 34b1 is set, the tangent line TL is a straight line that is tangent to the outer peripheral surface 31a at a midpoint P1 of a portion (arc) of the outer peripheral surface 31a that is within the range of this central angle θ34b1. In this embodiment, almost the entire second side 34b2 is formed along the side 34a1.

[0024] The first edge 34b1 extends along the tangent line TL, maintaining a predetermined distance from the tangent line TL and not too far from the tangent line TL. This includes a configuration in which the first edge 34b1 is parallel to the tangent line TL as well as a configuration in which the first edge 34b1 is non-parallel to the tangent line TL. The first edge 34b1 may be formed in a straight or curved shape. In this embodiment, the first edge 34b1 of the second flux barrier 34b is formed substantially parallel to the outer circumferential tangent line TL of the rotor core 31. In this case, the first edge 34b1 is formed in a substantially straight shape, but it may also be formed in an arc shape, for example. When the first edge 34b1 is formed in an arc shape, the first edge 34b1 may be formed parallel to the outer circumferential surface 31a of the rotor core 31 or non-parallel to the outer circumferential surface 31a.

[0025] The second side 34b2 is aligned along the side 34a1 of the first flux barrier 34a, thereby maintaining a predetermined distance from the side 34a1 and not being too far away from the side 34a1. This includes a configuration in which the second side 34b2 is parallel to the side 34a1 as well as a configuration in which the second side 34b2 is not parallel to the side 34a1.

[0026] A bridge 37a is formed between the second side 34b2 of the second flux barrier 34b and the radially outer side 34a1 of the first flux barrier 34a, dividing the flux barriers 34a, 34b into two sections 34a, 34b.

[0027] The second flux barrier 34b has a triangular cross section. Therefore, the angle θ1 formed between the first side 34b1 and the second side 34b2 of the second flux barrier 34b on the magnetic pole boundary side (q-axis side) of the magnet is an acute angle. This allows the first flux barrier 34a, the second flux barrier 34b, and the bridge 37a to be positioned comfortably to the side of the radially outer side surface 33a of the second magnet 33. Furthermore, the width of the magnetic path formed on the first side 34b1 side and the width of the magnetic path formed on the second side 34b2 side can be narrowed over a certain length, making it easy to control the magnetic flux.

[0028] As shown in Figure 3, the radially outer edge 34a1 of the first flux barrier 34a is connected to the edge 36a facing the radially outer side surface 33a of the second magnet 33 in the second magnet hole 36, and the first flux barrier 34a is formed as a hole portion communicating with the second magnet hole 36.

[0029] The bridge 37a in this embodiment is formed in a substantially straight line without any significant bends. In this case, "substantially straight line" refers to a form in which a straight line can be drawn extending from one end of the bridge 37a to the other end without touching the second side 34b2 of the second flux barrier 34b or the side 34a1 of the first flux barrier 34a. In Figure 3, this straight line is shown by a dashed line.

[0030] In addition, in this embodiment, the distance L37b between the outer circumferential surface TL of the rotor core 31 and the first edge 34b1 of the second flux barrier 34b is formed to be approximately equal to the distance L37a between the radially outer edge 34a1 of the first flux barrier 34a and the second edge 34b2 of the second flux barrier 34b.

[0031] In the rotor 3 of the present embodiment described above, of the magnets 32, 33 arranged in a double V-shape, diagonal bridges 37 are provided on the flux barriers 34a, 34b located between the magnet 33 near the inner diameter side (center) of the rotor core 31 and the outer peripheral surface 31a. This causes the magnetic path (path of magnetic flux) near the rotor core outer peripheral circle 31a to branch into two (outer diameter side 37b and inner diameter side 37a) midway, and magnetically saturates the magnetic path near the rotor core outer peripheral circle 31a, thereby making it possible to effectively control the level of magnetic flux density at each rotational position of the rotor 3 and reduce torque ripple.

[0032] Modifications of the first flux barrier 34a and the second flux barrier 34b will be described using Fig. 4. Fig. 4 is an enlarged plan view of a portion of the rotor 3 according to an embodiment of the present invention. Fig. 4 illustrates a configuration that can be seen from an end face perpendicular to the central axis 38a of the rotating shaft or from a cross section, and the following description will be based on the configuration illustrated in these figures.

[0033] In this example, the radially outer side 34a1 of the first flux barrier 34a is curved. Specifically, the side 34a1 is arc-shaped. The second side 34b2 of the second flux barrier 34b is also curved. Either the side 34a1 or the second side 34b2 may be linear. Even with such a shape, the same effects as those described above can be obtained.

[0034] The effects of this embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram for explaining the effects of the present invention, comparing the present invention with a conventional example in terms of changes in torque relative to the rotation angle of the rotor 3.

[0035] At a rotation angle a1, the magnetic path (path of magnetic flux) near the rotor core outer circumferential circle 31a is split into two (on the outer diameter side 37b and the inner diameter side 37a) midway, and the outer diameter side magnetic path 37b is magnetically saturated, causing magnetic flux to flow into the stator core 21 from the part just before the magnetically saturated point, thereby increasing the torque.

[0036] Although a technique for controlling the flow of magnetic flux density by providing axial grooves in the outer peripheral surface 31a of the rotor core 31 is known, in this embodiment, the flow of magnetic flux density can be effectively controlled by the first flux barrier 34a and the second flux barrier 34b, so there is no need to provide axial grooves in the outer peripheral surface 31a of the rotor core 31. This prevents the axial grooves from making it difficult for magnetic flux to flow through the stator core 21, making it possible to increase torque.

[0037] At rotation angle a2, the magnetic path 37b near the rotor core outer circumferential circle 31a is narrowed and magnetically saturated, which reduces the torque by making it difficult for magnetic flux to flow from the magnetically saturated portion to the stator core 21. In addition, the magnetic path near the rotor core outer circumferential circle 31a is split into two (outer diameter side 37b and inner diameter side 37a) midway, which causes the magnetic path near the rotor core outer circumferential circle 31a to become magnetically saturated, making it difficult for magnetic flux to flow from the magnetically saturated portion to the stator core 21, which reduces the torque.

[0038] At rotation angle a3, the magnetic path near the rotor core outer circumferential circle 31a is split into two (outer diameter side 37b and inner diameter side 37a) midway, and the magnetic path near the rotor core outer circumferential circle 31a is magnetically saturated, causing magnetic flux to flow into the stator core 21 from the part just before the magnetically saturated point, thereby increasing torque.

[0039] Due to the above-mentioned action, the torque at the rotation angle of the rotor 3, which is small in the conventional configuration, can be increased in the configuration of this embodiment, and torque ripple can be reduced while suppressing a decrease in maximum torque.

[0040] Comparative Example 1 of the present invention will be described using Fig. 6, and the effects of this embodiment will be described using Fig. 7. Fig. 6 is a plan view showing an enlarged portion of a rotor 3' according to Comparative Example 1 of the present invention. Fig. 7 is a diagram illustrating the effects of the present invention, comparing the present invention with Comparative Example 1 in terms of changes in torque relative to the rotation angle of the rotor 3.

[0041] Fig. 6 shows Comparative Example 1 in which the second flux barrier 34b is eliminated. In Comparative Example 1, by eliminating the triangular second flux barrier 34b, the effect of magnetically saturating the magnetic path is lost, and torque ripple increases, as shown in Fig. 7.

[0042] Comparative Example 2 of the present invention will be described using Fig. 8, and the effects of this embodiment will be described using Figs. 9 and 10. Fig. 8 is an enlarged plan view of a portion of a rotor 3' according to Comparative Example 2 of the present invention. Fig. 9 is a diagram illustrating the effects of the present invention, comparing the present invention with Comparative Example 2 in terms of changes in torque relative to the rotation angle of the rotor 3. Fig. 10 is a diagram extracted from Fig. 9.

[0043] Fig. 8 shows Comparative Example 2, in which the first flux barrier 34a and the second flux barrier 34b are combined into one. In Comparative Example 2, by combining the first flux barrier 34a and the second flux barrier 34b into one, the torque increases by suppressing leakage flux, but the torque ripple also increases, as shown in Fig. 9.

[0044] 10 , in the example of the present invention, the magnetic path near the rotor core outer circumferential circle 31a is split into two (on the outer diameter side 37b and the inner diameter side 37a) midway to disperse the magnetic flux, thereby reducing the magnetic flux flowing through the stator core 21 and reducing the torque compared to Comparative Example 2. In this case, the torque reduction effect at rotation angle a2 is smaller than the torque reduction effect at rotation angle a1.

[0045] In the example of the present invention, the maximum torque is smaller than in Comparative Example 2, but the decrease in maximum torque is suppressed compared to the conventional example, and the effect of reducing torque ripple is greater than in the conventional example and Comparative Example 2.

[0046] Comparative Example 3 of the present invention will be described using Fig. 11, and the effects of this embodiment will be described using Figs. 12 and 13. Fig. 11 is a plan view showing an enlarged portion of a rotor 3' according to Comparative Example 3 of the present invention. Fig. 12 is a diagram illustrating the effects of the present invention, comparing the present invention with Comparative Example 3 in terms of changes in torque relative to the rotation angle of the rotor 3. Fig. 13 is a diagram extracted from Fig. 12.

[0047] 11 shows Comparative Example 3, in which the first side 34b1 and the second side 34b2 of the second flux barrier 34b are spaced apart by a distance d on the q-axis side. In Comparative Example 3, by spaced apart the first side 34b1 and the second side 34b2 by the distance d, the maximum torque increases, but magnetic saturation is alleviated, resulting in increased torque ripple, as shown in FIG.

[0048] At rotation angle a5 in Figure 13, in an embodiment of the present invention, by shortening the distance between the branch points of the outer diameter side magnetic path 37b and the inner diameter side magnetic path 37a, magnetic saturation becomes more likely to occur, making it more difficult for magnetic flux to flow through the stator core 21, and therefore reducing torque.

[0049] In the example of the present invention, the maximum torque is smaller than in Comparative Example 3, but the decrease in maximum torque is suppressed compared to the conventional example, and the effect of reducing torque ripple is greater than in the conventional example and Comparative Example 3.

[0050] As described above, in the rotating motor 1 of this embodiment, the second flux barrier 34b is formed so that, at a predetermined rotational position of the rotor 3, a magnetic saturation region is formed between the first edge 34b1 of the second flux barrier 34b and the magnetic pole boundary (q-axis) of the rotor core 31.

[0051] The rotor 3 of the rotating electric machine 1 of the present embodiment described above has the following features: (1) The rotor 3 of the rotating electric machine 1 includes a rotor core 31 having magnets 32, 33, magnet insertion holes 35, 36 into which the magnets 32, 33 are inserted, and flux barriers 34a, 34b provided around the magnets 32, 33, wherein the magnets 32, 33 include a first magnet 32 ​​and a second magnet 33 arranged in a substantially V-shape radially inward of the first magnet 32, and the flux barriers 34a, 34b include a first flux barrier 34a facing a radially outer side surface 33a of the second magnet 33 and a second flux barrier 34b arranged radially outward of the first flux barrier 34a, The second flux barrier 34b has a first edge 34b1 that runs along the outer circumferential surface TL of the rotor core 31, and a second edge 34b2 that is located radially inward from the first edge 34b1 and at least a portion of which is formed along the radially outer edge 34a1 of the first flux barrier 34a.

[0052] (2) The first side 34 b 1 of the second flux barrier 34 b is formed substantially parallel to the outer circumferential surface TL of the rotor core 31 .

[0053] (3) The distance L37b between the outer circumferential surface TL of the rotor core 31 and the first edge 34b1 of the second flux barrier 34b is formed to be approximately equal to the distance L37a between the radially outer edge 34a1 of the first flux barrier 34a and the second edge 34b2 of the second flux barrier 34b.

[0054] (4) The magnet insertion hole includes a first magnet hole 35 into which the first magnet 32 ​​is inserted and a second magnet hole 36 into which the second magnet 33 is inserted, and the radially outer edge 34a1 of the first flux barrier 34a is connected to an edge 36a facing the radially outer side surface 33a of the second magnet 33 in the second magnet hole 36.

[0055] (5) The angle θ1 formed between the first side 34b1 and the second side 34b2 of the second flux barrier 34b on the magnetic pole boundary (q-axis) side of the magnets 32 and 33 is an acute angle.

[0056] (6) The second flux barrier 34b has a triangular cross section.

[0057] (7) A rotor in which the radially outer side 34a1 of the first flux barrier 34a has a curved shape.

[0058] (8) The second side 34b2 of the second flux barrier 34b has a curved shape.

[0059] (9) The radially outer side 34a1 of the first flux barrier 34a and the second side 34b2 of the second flux barrier 34b are curved.

[0060] (10) The second flux barrier 34b is formed so that, at a predetermined rotational position of the rotor 3, a magnetically saturated region is formed between the first edge 34b1 of the second flux barrier 34b and the magnetic pole boundary (q-axis) of the rotor core 31.

[0061] (11) The rotating electric machine 1 includes the rotor 3 described in any one of (1) to (10) and the stator 2 facing the rotor 3 with a gap G therebetween.

[0062] The present invention is not limited to the above-described embodiments and modifications, but includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the configurations. Furthermore, it is possible to add, delete, or replace part of the configurations of the embodiments and modifications with other configurations.

[0063] (1) 1... rotating electric machine, 2... stator, 3... rotor, 31... rotor core, 32... first magnet, 33... second magnet, 34a... first flux barrier, 34a1... radially outer edge of first flux barrier 34a, 34b... second flux barrier, 34b1... first edge of second flux barrier, 34b2... second edge of second flux barrier, 35... first magnet hole, 36... second magnet hole, 36a... radially outer side of second magnet 33 in second magnet hole 36 The edge facing the side surface 33a, L37a...the distance between the radially outer edge 34a1 of the first flux barrier 34a and the second edge 34b2 of the second flux barrier 34b, L37b...the distance between the outer circumferential tangent line TL and the first edge 34b1 of the second flux barrier 34b, TL...the outer circumferential tangent line of the rotor core 31, θ1...the angle on the magnetic pole boundary (q-axis) side of the magnets 32, 33 formed between the first edge 34b1 and the second edge 34b2 of the second flux barrier 34b.

Claims

1. A rotor for a rotating electric machine comprising a rotor core having a magnet, a magnet insertion hole into which the magnet is inserted, and a flux barrier arranged around the magnet, wherein the magnet includes a first magnet and a second magnet arranged in a roughly V-shape radially inward of the first magnet, and the flux barrier includes a first flux barrier facing the radially outer side surface of the second magnet, and a second flux barrier arranged radially outward of the first flux barrier, and the second flux barrier has a first side that follows the outer circumferential tangent line of the rotor core, and a second side that is located radially inward from the first side and has at least a portion formed along the radially outer side of the first flux barrier.

2. A rotor for a rotating electric machine according to claim 1, wherein the first side of the second flux barrier is formed substantially parallel to an outer circumferential tangent line of the rotor core.

3. A rotor for a rotating electric machine as described in claim 1, wherein the distance between the outer circumferential surface of the rotor core and the first edge of the second flux barrier is formed to be approximately equal to the distance between the radially outer edge of the first flux barrier and the second edge of the second flux barrier.

4. A rotor for a rotating electric machine as described in claim 1, wherein the magnet insertion hole includes a first magnet hole into which the first magnet is inserted and a second magnet hole into which the second magnet is inserted, and the radially outer edge of the first flux barrier is connected to the edge of the second magnet hole that faces the radially outer side surface of the second magnet.

5. A rotor for a rotating electric machine according to claim 1, wherein the angle formed between the first side and the second side of the second flux barrier on the magnetic pole boundary side of the magnet is an acute angle.

6. A rotor for a rotating electric machine according to claim 1, wherein the second flux barrier has a triangular cross section.

7. A rotor for a rotating electric machine according to claim 1, wherein the radially outer side of the first flux barrier has a curved shape.

8. A rotor for a rotating electric machine according to claim 1, wherein the second side of the second flux barrier has a curved shape.

9. A rotor for a rotating electric machine according to claim 1, wherein the radially outer side of the first flux barrier and the second side of the second flux barrier are curved.

10. A rotor for a rotating electric machine as described in claim 1, wherein the second flux barrier is formed so that, at a predetermined rotational position of the rotor, a magnetically saturated region is formed between the first edge of the second flux barrier and the magnetic pole boundary of the rotor core.

11. A rotating electric machine comprising the rotor of claim 1 and a stator facing the rotor across an air gap.

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