Rotating electric machine

Abstract

To provide a rotating electric machine that can further reduce iron loss under low load conditions and improve efficiency. [Solution] The rotor 2 comprises a rotor core 12, a first permanent magnet 30 (31) arranged to cross the d-axis and embedded in the rotor core, a first magnetic barrier 21 formed at the circumferential end of the first permanent magnet and extending inward from the first permanent magnet, a second magnetic barrier 22 arranged to cross the q-axis and formed between the first magnetic barriers 21 at adjacent magnetic poles, and a third magnetic barrier 23 arranged to cross the d-axis and positioned inward from the first permanent magnet. A first leakage flux path 16 is formed between the first magnetic barrier 21 and the second magnetic barrier 22. A second leakage flux path 24 is formed between the first magnetic barrier 21 and the third magnetic barrier 23.

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a rotating electrical machine that forms a leakage magnetic flux path by a magnetic barrier provided on a rotor to improve efficiency in a low load region.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The structure described in Patent Document 1 forms a leakage magnetic flux path by a magnetic barrier provided near (between magnetic poles) a permanent magnet. However, since the magnetic barrier is arranged near the outer diameter side of the rotor core, it is impossible to control the leakage magnetic flux flowing to the inner diameter side more than 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 capable of more effectively reducing iron loss during low load by more appropriately controlling leakage magnetic flux of a rotor and improving efficiency.

[0006] According to one aspect of the present invention, it is applied to a rotating electric machine equipped with a rotor. The rotor comprises a rotor core, a first permanent magnet arranged to cross the d-axis and embedded in the rotor core, a first magnetic barrier formed at the circumferential end of the first permanent magnet and extending inward from the first permanent magnet, a second magnetic barrier arranged to cross the q-axis and formed between the first magnetic barriers at adjacent magnetic poles, and a third magnetic barrier arranged to cross the d-axis and positioned inward from the first permanent magnet. A first leakage flux path is formed between the first magnetic barrier and the second magnetic barrier. A second leakage flux path is formed between the first magnetic barrier and the third magnetic barrier.

[0007] According to the present invention, the short-circuit magnetic flux between the inner and outer diameter sides of the first permanent magnet flows not only through the first leakage flux path but also through the second leakage flux path formed between the first and third magnetic barriers, thereby enabling magnetic saturation in both the first and second leakage flux paths. This allows the stator's flux linkage to be reduced more effectively than in conventional designs under low-load conditions. As a result, iron loss in the stator can be reduced more effectively, improving the efficiency of the rotating electric machine under low-load conditions. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a partial cross-sectional view of a rotating electric machine according to an embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the main part of the rotor. [Figure 3] Figure 3 is a cross-sectional view of the main part of a modified rotor. [Figure 4] Figure 4 is a cross-sectional view of the main part of another modified rotor. [Figure 5] Figure 5 is a cross-sectional view of the main part of another modified rotor. [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 a rotating electric machine 100 according to an embodiment of the present invention.

[0011] As shown in Figure 1, the rotating electric machine 100 of this embodiment comprises an annular stator 1, a rotor 2 arranged concentrically with the stator 1 and rotatably connected via an air gap 13, and a rotating shaft 15 passing through the center of the rotor 2.

[0012] The rotating electric machine 100 is mounted on an electric vehicle and functions as an electric motor that drives the wheels. It 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 stator 1 has a ring-shaped stator core 11, a plurality of teeth 8 protruding inward from the stator core 11, and slots 9 which are spaces between adjacent teeth 8. Stator windings 10 are wound around the teeth 8. The stator core 11 is constructed by laminating electromagnetic steel sheets punched into predetermined shapes.

[0014] The rotor 2 consists of a rotor core 12 and permanent magnets 30 inserted into magnet holes 20 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 constructed by laminating electromagnetic steel sheets punched into predetermined shapes. The magnet holes 20 are formed at equal intervals in the circumferential direction of the rotor core 12, and a permanent magnet 30 is embedded in each of the magnet holes 20.

[0015] On the rotor 2, 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 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.

[0016] The rotor core 12 has a plurality of magnet holes 20, which are voids formed to penetrate in the axial direction, and magnetic barriers (first magnetic barrier 21, second magnetic barrier 22, third magnetic barrier 23). The inner circumferential shape of the magnet holes 20 is formed to be substantially the same as the outer shape of the permanent magnet 30. The first magnetic barrier 21 is formed as a void that is continuous from the end of the magnet hole 20. The second magnetic barrier 22 is a void that is formed independently of the magnet holes 20 and the first magnetic barrier 21.

[0017] The permanent magnet 30 (also referred to as the first permanent magnet 31) has a rectangular cross-sectional shape when viewed in the axial direction of the rotor 2. The permanent magnet 30 is arranged symmetrically with respect to the d-axis, so as to cross the d-axis. The permanent magnet 30 is fixed in the magnet hole 20 formed in the rotor core 12.

[0018] The first magnetic barrier 21 and the second magnetic barrier 22 are formed as voids containing air. Since air has a lower relative permeability and higher magnetic resistance than electromagnetic steel sheets, it acts as a barrier to magnetic flux in the magnetic circuit formed by the permanent magnet 30 in the rotor 2.

[0019] The first magnetic barrier 21 consists of a first magnetic barrier 21a formed on one end of the permanent magnet 30 and a first magnetic barrier 21b formed on the other end of the permanent magnet 30. The first magnetic barrier 21 is positioned in a region closer to the center of rotation than the second magnetic barrier 22 and extends from the circumferential end of the permanent magnet 30 toward the inner diameter side of the permanent magnet 30. More specifically, the first magnetic barrier 21 is formed to approach the q-axis as it moves toward the inner diameter side. The width of the first magnetic barrier 21 in the circumferential direction differs between the outer and inner diameter sides, with the tip being narrower.

[0020] The second magnetic barrier 22 is formed between adjacent permanent magnets 30, more specifically, between the first magnetic barrier 21a of one magnetic pole 35 and the first magnetic barrier 21b of the other magnetic pole 35. The second magnetic barrier 22 is arranged at a position symmetric about the q-axis so as to cross the q-axis. The second magnetic barrier 22 is located near the outer periphery of the rotor core 12 and has a substantially triangular cross-sectional shape with a narrower width on the inner diameter side than on the outer diameter side in the axial view.

[0021] Note that the shapes of these first magnetic barriers 21 and second magnetic barrier 22 are not limited to the shapes shown in the figure as long as the functions of this embodiment are achieved.

[0022] The constricted portion of the rotor core 12 formed between these first magnetic barriers 21 (21a, 21b) and the second magnetic barrier 22 functions as the first leakage magnetic flux path 16. A part of the magnetic flux of the permanent magnet 30 passes through the first leakage magnetic flux path 16.

[0023] The rotating electrical machine 100 is configured as a variable magnetic flux type rotating electrical machine by including the first leakage magnetic flux path 16. The variable magnetic flux type rotating electrical machine is characterized in that it can reduce iron loss by changing the magnetic path of a part (leakage magnetic flux) of the magnetic flux of the permanent magnet 30 of the rotor 2 by the action of the load current (stator current) applied to the stator winding 10 of the stator 1.

[0024] Specifically, when the current flowing through the stator winding 10 is small, such as at no load or low load, the ratio of the leakage magnetic flux flowing through the first leakage magnetic flux path 16 in the magnetic flux of the permanent magnet 30 increases, so that the permanent magnet 30 acts to reduce the residual magnetic flux density of the magnetic circuit formed in the rotor 2. As a result, the magnetic flux linked to the stator 1 decreases, and the iron loss of the stator 1 is reduced. By reducing the iron loss of the stator 1, the induced voltage decreases, and the variable speed range in the low torque region can be expanded, so that the efficiency of the rotating electrical machine 100 can be improved.

[0025] Furthermore, increasing the current supplied to the stator winding 10, as in high-load conditions, increases the magnetic flux component linked from the permanent magnet 30 to the stator 1, thereby increasing the torque of the rotating electric machine 100.

[0026] In conventional variable flux rotating electric machines, the first magnetic barrier, the second magnetic barrier, and the first leakage flux path are arranged near the outer diameter side of the rotor core where the permanent magnets are located. With this configuration, it was not possible to control the leakage flux flowing to the inner diameter side of the permanent magnets.

[0027] Therefore, in this embodiment, the magnetic flux flowing to the inner diameter side of the permanent magnet 30 is controlled, as will be explained below.

[0028] Figure 2 is a cross-sectional view of the main part of the rotor 2 of this embodiment, perpendicular to the axial direction.

[0029] As shown in Figure 2, the rotor core 12 is provided with a third magnetic barrier 23, which is a void, on the inner diameter side of the permanent magnet 30. The third magnetic barrier 23 has a rectangular cross-section when viewed in the axial direction of the rotor 2. The third magnetic barrier 23 is positioned symmetrically with respect to the d-axis, so as to cross the d-axis. The third magnetic barrier 23 is positioned on the inner diameter side of the permanent magnet 30 and is substantially parallel to the permanent magnet 30.

[0030] The third magnetic barrier 23 is formed such that its longitudinal (circumferential) end faces the inner surface of the tip portion of the first magnetic barrier 21, and the constricted portion of the rotor core 12 sandwiched between the first magnetic barrier 21 (21a, 21b) and the third magnetic barrier 23 functions as the second leakage flux path 24.

[0031] The third magnetic barrier 23, like the first magnetic barrier 21 and the second magnetic barrier 22, is a void containing air, and therefore acts as a barrier to magnetic flux in the magnetic circuit formed by the permanent magnet 30.

[0032] In this configuration, the magnetic flux that short - circuits from the outer diameter side to the inner diameter side of the permanent magnet 30 passes through the outer diameter side of the second magnetic barrier 22 of the rotor core 12 and the first leakage magnetic flux path 16, then passes between the first magnetic barriers 21 between adjacent magnetic poles 35, and heads toward the inner diameter side of the third magnetic barrier 23. This magnetic flux returns to the permanent magnet 30 through the second leakage magnetic flux path 24. When the poles of the permanent magnet 30 are reversed, the direction in which the magnetic flux heads is the opposite of this.

[0033] Here, when the current flowing through the stator winding 10 is small, such as at low load, not only the first leakage magnetic flux path 16 but also the width of the second leakage magnetic flux path 24 is narrow, causing magnetic saturation to occur in the second leakage magnetic flux path 24. In addition to the increase in magnetic resistance in the first leakage magnetic flux path 16, the magnetic resistance in the second leakage magnetic flux path 24 also increases. As a result, the residual magnetic flux density of the magnetic circuit formed by the permanent magnet 30 in the rotor 2 further decreases in addition to the effect in the aforementioned first leakage magnetic flux path 16. Thereby, the magnetic flux linked to the stator 1 significantly decreases, and the iron loss of the stator 1 can be more effectively reduced. As a result, the variable - speed range in the low - torque region expands, and the efficiency of the rotating electrical machine 100 can be further improved.

[0034] At high load, as described above, since the magnetic - flux component linked from the permanent magnet 30 to the stator 1 increases, even when the third magnetic barrier 23 is provided, the torque can be increased.

[0035] It is desirable that the width of the second leakage magnetic flux path 24 in the axial - direction view, that is, the distance L between the third magnetic barrier 23 and the first magnetic barrier 21, is configured to be smaller than the sum (X + Y) of the distance X between the second magnetic barrier 22 and the outer peripheral surface of the rotor core 12 and the width of the first leakage magnetic flux path 16, that is, the distance Y between the first magnetic barrier 21 and the second magnetic barrier 22 (L < X + Y).

[0036] In other words, the magnetic flux emanating from the outer surface of the permanent magnet 30 passes through the outer diameter side of the second magnetic barrier 22 of the rotor core 12 and the first leakage flux path 16 before flowing into the second leakage flux path 24. Therefore, the flow of magnetic flux short-circuiting from the outer diameter side to the inner diameter side of the permanent magnet 30 is limited by these cross-sectional areas, causing magnetic saturation in the first leakage flux path 16. The magnetic flux that has passed through the first leakage flux path 16 then passes through the second leakage flux path 24, which has a cross-sectional area smaller than the sum of these cross-sectional areas, causing magnetic saturation in the second leakage flux path 24 as well.

[0037] The rotating electric machine 100 of this embodiment described above includes a rotor 2. The rotor 2 includes a rotor core 12, a permanent magnet 30 arranged to cross the d-axis and embedded in the rotor core 12, a first magnetic barrier 21 formed at the circumferential end of the permanent magnet 30 and extending inward from the permanent magnet 30, a second magnetic barrier 22 arranged to cross the q-axis and formed between the first magnetic barrier 21 at adjacent magnetic poles 35, and a third magnetic barrier 23 arranged to cross the d-axis and positioned inward from the permanent magnet 30. A first leakage flux path 16 is formed between the first magnetic barrier 21 and the second magnetic barrier 22. A second leakage flux path 24 is formed between the first magnetic barrier 21 and the third magnetic barrier 23.

[0038] In this configuration, the short-circuit flux between the outer and inner diameter sides of the permanent magnet 30 is passed not only through the first leakage flux path 16 but also through the second leakage flux path 24 formed between the first magnetic barrier 21 and the third magnetic barrier 23. This allows for magnetic saturation in both the first and second leakage flux paths 16 and 24. As a result, the flux linkage of the stator 1 can be reduced compared to conventional designs under low-load conditions. Consequently, the iron loss of the stator 1 can be reduced more efficiently, thereby improving the efficiency of the rotating electric machine 100 under low-load conditions.

[0039] Furthermore, in this embodiment, the sum of the distance X between the second magnetic barrier 22 and the outer surface of the rotor 2, and the distance Y between the first magnetic barrier 21 and the second magnetic barrier 22, is greater than the distance L between the third magnetic barrier 23 and the first magnetic barrier 21.

[0040] In this configuration, the magnetic flux that exits the permanent magnet 30 and passes through the first leakage flux path 16 passes through the second leakage flux path 24, which is an even narrower constriction. This makes it easier for magnetic saturation to occur in the second leakage flux path 24, thus reducing the flux linkage of the stator 1 under low load conditions.

[0041] Furthermore, in this embodiment, since the third magnetic barrier 23 is configured as an void, the air, which has high magnetic resistance, causes the third magnetic barrier 23 to act as a barrier against magnetic flux.

[0042] Next, a modified example of this embodiment will be described with reference to the figures. Figure 3 is a cross-sectional view perpendicular to the axial direction of the main part of the rotor 2 of the modified example of this embodiment.

[0043] The modified example shown in Figure 3 illustrates a case where the second permanent magnet 32 ​​is embedded within the third magnetic barrier 23.

[0044] The second permanent magnet 32 ​​is fitted into the third magnetic barrier 23. The second permanent magnet 32 ​​has a substantially rectangular cross-section when viewed in the axial direction of the rotor 2, and is arranged to cross the d-axis and be symmetrical with respect to the d-axis. End spaces of the third magnetic barrier 23 remain at both longitudinal ends of the second permanent magnet 32, and as explained in Figure 2, a second leakage flux path 24 is formed sandwiched between the first magnetic barrier 21 and the third magnetic barrier 23.

[0045] In this configuration, the magnetic pole 35 is composed of two permanent magnets 30, a first permanent magnet 31 and a second permanent magnet 32. The sum of their magnetic fluxes acts on the stator 1, thereby improving the torque of the rotating electric machine 100 compared to the configurations shown in Figures 1 and 2.

[0046] Furthermore, the second permanent magnet 32 ​​has a lower relative permeability and higher magnetic resistance than the electromagnetic steel sheet. Therefore, even when the second permanent magnet 32 ​​is fitted into the third magnetic barrier 23, it acts as a magnetic barrier against magnetic flux, similar to the case where the third magnetic barrier 23 is an empty space as explained in Figures 1 and 2, thus more effectively reducing the iron loss of the stator 1.

[0047] Furthermore, in the configuration shown in Figure 3, it is desirable that the circumferential width L1o of the outer diameter side of the first permanent magnet 31 be larger than the circumferential width L2i of the inner diameter side of the second permanent magnet 32 ​​(L1o > L2i).

[0048] In other words, the magnetic flux emanating from the outer surface of the first permanent magnet 31 passes through the outer diameter side of the second magnetic barrier 22 of the rotor core 12 and the first leakage flux path 16, before heading towards the inner circumference side of the second permanent magnet 32. By making the circumferential width L1o of the outer diameter side of the first permanent magnet 31 larger than the circumferential width L2i of the inner diameter side of the second permanent magnet 32, the magnetic flux concentrates in the constricted second leakage flux path 24 as it moves from the outer surface of the first permanent magnet 31, which has a larger cross-sectional area, to the inner surface of the second permanent magnet 32, which has a smaller cross-sectional area. This makes magnetic saturation in the second leakage flux path 24 more likely to occur.

[0049] Alternatively, the first permanent magnet 31 may have a trapezoidal shape in which the circumferential width L1o of the outer diameter side is greater than the circumferential width L1i of the inner diameter side, and the second permanent magnet 32 ​​may have a trapezoidal shape in which the circumferential width L2o of the outer diameter side is greater than the circumferential width L2i of the inner diameter side. With this configuration, the circumferential width of the first permanent magnet 31 gradually decreases from the outer diameter side towards the inner diameter side, and from the outer diameter side towards the inner diameter side of the second permanent magnet 32.

[0050] Figure 4 is a cross-sectional view perpendicular to the axial direction of the main part of the rotor 2 of another modified example of this embodiment.

[0051] The modified example shown in Figure 4 is a modification of the configuration in Figure 3, and shows an example in which the first permanent magnet 31 and the second permanent magnet 32 ​​are configured as arc shapes that bulge outwards on the outer diameter side.

[0052] In this configuration, similar to the configuration described in Figure 3, the magnetic pole 35 is composed of two permanent magnets 30, a first permanent magnet 31 and a second permanent magnet 32. The sum of their magnetic fluxes acts on the stator 1, thereby improving the torque of the rotating electric machine 100 compared to the configurations shown in Figures 1 and 2.

[0053] Furthermore, by making the first permanent magnet 31 and the second permanent magnet 32 ​​have an arc shape that bulges outwards, the magnetic flux acting on the opposing stator 1 approaches a sine wave, thereby reducing harmonic components and suppressing torque ripple.

[0054] Furthermore, by making the first permanent magnet 31 and the second permanent magnet 32 ​​arc-shaped, the circumferential width (width of the curved surface) of the outer diameter side of the first permanent magnet 31 is made larger than the circumferential width of the inner diameter side of the second permanent magnet 32. As a result, similar to the configuration described in Figure 3, as the magnetic flux moves from the outer surface of the first permanent magnet 31, which has a larger cross-sectional area, to the inner surface of the second permanent magnet 32, which has a smaller cross-sectional area, the magnetic flux concentrates in the constricted second leakage flux path 24, making magnetic saturation in the second leakage flux path 24 more likely to occur.

[0055] Figure 5 is a cross-sectional view perpendicular to the axial direction of the main part of the rotor 2 of yet another modification of this embodiment.

[0056] The modified configuration shown in Figure 5 is a variation of the configuration in Figure 4, and shows an example in which the second permanent magnet 32 ​​is divided into a first segment magnet 32a and a second segment magnet 32b.

[0057] The third magnetic barrier 23 is divided into two parts: a third magnetic barrier 23a formed to the left of the circumferential direction (rotation direction side) of the d-axis, and a third magnetic barrier 23b formed to the right of the circumferential direction (opposite side of the rotation direction) of the d-axis. The second permanent magnet 32 ​​consists of two parts: a first segment magnet 32a inserted into the third magnetic barrier 23a, and a second segment magnet 32b inserted into the third magnetic barrier 23b. A bridge portion 25, which is part of the rotor core 12, is formed between the third magnetic barrier 23a and the third magnetic barrier 23b.

[0058] Even when the second permanent magnet 32 ​​on the inner diameter side is divided into two, the magnetic pole 35 is composed of two permanent magnets 30, the first permanent magnet 31 and the second permanent magnet 32, similar to the configuration described in Figure 3. The sum of their magnetic fluxes acts on the stator 1, thereby improving the torque of the rotating electric machine 100 compared to the configurations shown in Figures 1 and 2.

[0059] Furthermore, similar to the configuration described in Figure 4, by making the first permanent magnet 31 and the second permanent magnet 32 ​​arc-shaped and bulging outwards, the magnetic flux acting on the opposing stator 1 approaches a sine wave, thereby reducing harmonic components and suppressing torque ripple.

[0060] Furthermore, the formation of a bridge portion 25 between the first segment magnet 32a and the second segment magnet 32b reduces the cross-sectional area of ​​the third magnetic barrier 23 (23a, 23b), which is a void, thereby increasing the strength of the rotor core 12. As a result, stress concentration at high rotational speeds of the rotor 2 is alleviated, making it possible to increase the maximum rotational speed of the rotating electric machine 100.

[0061] Furthermore, the magnetic flux emitted from the first permanent magnet 31 is concentrated on the inner diameter side of the second permanent magnet 32, near the end of the second permanent magnet 32, that is, near the third magnetic barrier 23. Therefore, the presence of the bridge portion 25 does not affect the magnetic circuit that the permanent magnet 30 forms in the rotor 2.

[0062] 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.

[0063] As explained in Figure 5, the configuration shown is in which the arc-shaped second permanent magnet 32 ​​is divided into two segment magnets, but it is not limited to this, and the rectangular second permanent magnet 32 ​​as explained in Figure 3 may be divided into two segment magnets and a bridge portion 25 may be formed between them. [Explanation of symbols]

[0064] 1: Stator, 2: Rotor, 12: Rotor core, 16: Leakage flux path, 20: Magnet hole, 21: First magnetic barrier, 22: Second magnetic barrier, 23: Third magnetic barrier, 24: Leakage flux path, 25: Bridge section, 30: Permanent magnet, 31: First permanent magnet, 32: Second permanent magnet, 32a: First segment magnet, 32b: Second segment magnet, 35: Magnetic pole, 100: Rotating electric machine

Claims

1. A rotating electric machine equipped with a rotor, The rotor is Rotor core and A first permanent magnet is positioned to cross the d-axis and embedded in the rotor core, A first magnetic barrier is formed at the circumferential end of the first permanent magnet and extends inward from the first permanent magnet, A second magnetic barrier is positioned so as to cross the q-axis and is formed between the first magnetic barriers at adjacent magnetic poles, The system comprises a third magnetic barrier positioned so as to cross the d-axis and positioned on the inner diameter side of the first permanent magnet, A first leakage flux path is formed between the first magnetic barrier and the second magnetic barrier. A second leakage flux path is formed between the first magnetic barrier and the third magnetic barrier. Rotating electric machine.

2. A rotating electric machine according to claim 1, The distance between the second magnetic barrier and the outer surface of the rotor, and the sum of the distances between the first magnetic barrier and the second magnetic barrier, are greater than the distance between the third magnetic barrier and the first magnetic barrier. Rotating electric machine.

3. A rotating electric machine according to claim 1, The third magnetic barrier is configured as a void. Rotating electric machine.

4. A rotating electric machine according to claim 3, A second permanent magnet having a lower relative permeability than the rotor core is fitted into the void in the third magnetic barrier. Rotating electric machine.

5. A rotating electric machine according to claim 4, The first permanent magnet and the second permanent magnet are formed with a rectangular cross-section in an axial view. The circumferential width of the outer diameter side of the first permanent magnet is greater than the circumferential width of the inner diameter side of the second permanent magnet. Rotating electric machine.

6. A rotating electric machine according to claim 4, The first and second permanent magnets have an arc shape that bulges outwards in an axial view. Rotating electric machine.

7. A rotating electric machine according to claim 4, The second permanent magnet consists of two segment magnets divided in the circumferential direction, A bridge portion is formed between the two segment magnets. Rotating electric machine.

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