WO2025220155A1 - Rotating electric machine - Google Patents

Abstract

Provided is a rotating electric machine comprising: a stator 1 having a slot 9 and a winding 10; and a rotor 2 having a permanent magnet 3 and a rotor core 12, the rotor being disposed with an air gap 13 between the rotor and the stator 1. The permanent magnet 3 comprises: a main magnet 31 that is arranged at a magnetic pole center and that has a magnetic pole oriented in a radial direction of the rotor 2; and an auxiliary magnet 32 that is adjacent to the main magnet 31 and that has a magnetic pole oriented in a circumferential direction. The main magnet 31 and the auxiliary magnet 32 are alternately arranged on an outer peripheral side of the rotor core 12 according to a Halbach array. In a radial direction cross section of the rotor 2, the main magnet 31 is formed in a trapezoidal shape in which the length of one side facing the stator 1 is shorter than the length of the other side located on the side opposite the stator 1. The rotor core 12 has, on the stator 1-side surface thereof, a groove-shaped main magnet fixation part 21 that is formed so as to correspond to the cross-sectional shape of the main magnet 31, and the main magnet 31 is fitted into and fixed to the main magnet fixation part 21.

Description

Rotating electric machines

The present invention relates to a rotating electric machine.

JP2022-161445A discloses a rotating electric machine equipped with an outer rotor in which permanent magnets consisting of main magnets and auxiliary magnets are arranged in a Halbach array.

The rotating electric machine described in the above document has a configuration in which the main magnets and auxiliary magnets are fixed to the surface of the rotor with adhesive or the like. With this configuration, the permanent magnets are held in place by the adhesive, which limits how much holding strength can be increased, and there is a problem in that durability cannot be sufficiently increased.

The present invention was made in consideration of these problems, and aims to provide a rotating electric machine that can improve durability by increasing the holding strength of permanent magnets.

One aspect of the present invention provides a rotating electric machine comprising a stator having slots and windings, and a rotor having permanent magnets and a rotor core, with an air gap between it and the stator. The permanent magnets comprise main magnets arranged at the pole center with their magnetic poles oriented in the radial direction of the rotor, and auxiliary magnets adjacent to the main magnets with their magnetic poles oriented in the circumferential direction, with the main magnets and auxiliary magnets arranged alternately on the outer periphery of the rotor core in a Halbach array. In a radial cross section of the rotor, the main magnets are formed in a trapezoidal shape with one side facing the stator being shorter than the other side on the opposite side from the stator. The rotor core has groove-shaped main magnet fixing portions formed on its surface facing the stator to correspond to the cross-sectional shape of the main magnets, and the main magnets are fitted and fixed into the main magnet fixing portions.

FIG. 1 is a cross-sectional view of a rotating electrical machine according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the rotating electrical machine of the present invention. FIG. 3 is a cross-sectional view of a rotating electrical machine according to a modified example of the present invention. FIG. 4 is a cross-sectional view of a rotating electrical machine according to another modified example of the present invention. FIG. 5 is a cross-sectional view of a rotating electrical machine according to still another modified example of the present invention. FIG. 6 is a cross-sectional view of a rotating electrical machine according to still another modified example of the present invention. FIG. 7 is a cross-sectional view of a rotating electrical machine according to still another modified example of the present invention. FIG. 8 is a cross-sectional view of a rotating electrical machine according to still another modified example of the present invention. FIG. 9 is a cross-sectional view of a rotating electric machine according to still another modified example of the present invention. FIG. 10 is a cross-sectional view of a rotating electric machine according to still another modified example of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 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, showing a portion of the overall configuration. The remaining portions of the overall configuration are continuous repeats of the partial configuration shown in FIG. 1.

The rotating electric machine 100 of this embodiment comprises a ring-shaped stator 1, a rotor 2 that is concentric with the stator 1 and is arranged on the outer periphery of the stator 1 with an air gap 13 between it and the rotor 2, and a permanent magnet 3 that is arranged on the inner periphery of the rotor 2, facing the air gap 13. The permanent magnet 3 consists of a main magnet 31 and an auxiliary magnet 32. The main magnets 31 and auxiliary magnets 32 are arranged alternately in the circumferential direction according to a Halbach array.

The rotating electric machine 100 of this embodiment is mounted on an electric vehicle and functions as an electric motor that drives the wheels. It also functions as a generator that generates electricity (regeneratively) using the rotation of the wheels. It may also be used as a drive device for devices other than automobiles, such as various electrical appliances or industrial machinery.

The stator 1 is composed of a ring-shaped stator core 11 and stator windings 10 wound around slots 9 formed in the stator core 11. The stator core 11 is formed with multiple teeth 8 that protrude toward the outer periphery (toward the rotor 2) and slots 9 that are the spaces between adjacent teeth 8. The stator core 11 is composed of laminated electromagnetic steel sheets.

The rotor 2 has a rotor core 12. The rotor core 12 is constructed by laminating electromagnetic steel sheets. A main magnet 31 and an auxiliary magnet 32 are fixed to the inner circumferential surface (the surface facing the stator 1) of the rotor core 12. The rotor 2 is connected to the rotor shaft via a connecting part (not shown).

In the rotor 2 of this embodiment, the main magnets 31 and auxiliary magnets 32 are arranged alternately in the circumferential direction along the inner surface of the rotor core 12 in a Halbach array. The main magnets 31 are arranged so that their magnetic poles are in the radial direction of the rotor 2, and adjacent main magnets 31 are arranged so that their magnetic poles are opposite. The auxiliary magnets 32 are arranged so that their magnetic poles are in the circumferential direction of the rotor 2, i.e., so that their magnetic poles are perpendicular to those of the main magnets 31. With this configuration, the magnetic flux of the main magnet 31, which is the magnetic pole center, is deflected by the auxiliary magnets 32 toward the stator 1, increasing the magnetic flux linking with the stator 1, thereby improving the torque efficiency of the rotating electric machine 100.

Furthermore, the rotor 2 has magnetic poles formed by two circumferentially adjacent main magnets 31 and the auxiliary magnet 32 between them; in Figure 1, four main magnets 31 form four magnetic poles. The opposing stator 1 has three teeth 8 and three slots 9, with two magnetic poles facing each tooth 8.

In this way, the rotating electric machine 100 is configured so that two magnetic poles face each other for one slot 9. The relationship between these is S = R ± P, where S is the number of slots, R is the number of pole pairs of the permanent magnets 3, and P is the number of pole pairs of the stator winding 10 of the stator 1. In this embodiment, by configuring the rotating electric machine 100 in this way, modulated flux linkage is generated in the stator 1 when the rotor 2 rotates, and a magnetic field is generated in the stator 1 in synchronization with the modulated flux linkage. As a result, the magnetic field of the stator 1 advances the electrical angle, and this effect is added to the magnetic flux of the rotor 2, thereby increasing the torque of the rotating electric machine 100.

Next, we will explain how to fix the permanent magnets 3 in the rotor 2 configured in this way.

As shown in Figure 2, the main magnet 31 is formed so that its radial cross-sectional shape is a trapezoid with long sides in the circumferential direction, and the length of one side (top side) 31d facing the stator 1 is shorter than the length of the other side (bottom side) 31a on the side opposite the stator 1. The auxiliary magnet 32 is disposed between the main magnets 31, and its radial cross-sectional shape is a rectangle with a circumferential long side shorter than that of the main magnet 31.

The main magnet 31 is fitted and fixed in a main magnet fixing portion 21 formed on the inner circumferential surface of the rotor core 12. The main magnet fixing portion 21 is configured as a groove that opens toward the inner circumferential surface of the rotor core 12, and its radial cross section is configured as a trapezoidal groove that corresponds to the shape of the main magnet 31. The main magnet fixing portion 21 has circumferential side portions 21b, 21c that are tapered and inclined, increasing in diameter toward the outer periphery of the rotor core 12, and this inclination is configured to correspond to the side shape of the main magnet 31. When the main magnet 31 is fitted in the main magnet fixing portion 21, the side surfaces 31b, 31c of the main magnet 31 abut and are supported by the side portions 21b, 21c of the main magnet fixing portion 21, so the main magnet 31 is firmly fixed to the rotor core 12 without shifting radially. This increases the holding strength of the main magnet 31 and enables the durability of the rotor 2 to be improved.

Furthermore, because the main magnet 31 is fitted and fixed in the groove-shaped main magnet fixing portion 21, the main magnet 31 can be positioned so that it is exposed on the surface of the rotor 2, and can be brought as close as possible to the surface of the stator 1 (the surface facing the tips of the teeth 8). In other words, the distance of the air gap 13 can be reduced. This increases the efficiency with which the magnetic flux of the rotor 2 acts on the stator 1, thereby improving the torque efficiency of the rotating electric machine 100.

The auxiliary magnets 32 are fixed to the rotor core 12 by being inserted into auxiliary magnet fixing portions 22, which serve as magnet fixing holes (through holes) formed axially through the rotor core 12. The auxiliary magnet fixing portions 22 are formed between adjacent main magnet fixing portions 21 on the rotor core 12. This allows the auxiliary magnets 32 to be firmly fixed to the rotor core 12.

Note that the shapes of the main magnet 31 and main magnet fixing portion 21 may vary due to manufacturing tolerances. If these tolerances cause the inclination of the side portions 21b, 21c of the main magnet fixing portion 21 and the inclination of the side surfaces 31b, 31c of the main magnet 31 to deviate from the design values, the main magnet 31 may protrude more than necessary from the surface of the rotor 2.

To prevent this, as shown in Figure 2, it is desirable to make the angle θ1 formed between the bottom 21a of the main magnet fixing portion 21 and the side portions 21b, 21c at both ends in the circumferential direction more acute than the angle θ2 formed between the other side (bottom side) 31a of the main magnet 31 and the side surfaces 31b, 31c at both ends in the circumferential direction, i.e., θ1 < θ2. As an example, θ1 is set to 80 degrees and θ2 is set to 85 degrees.

By configuring it in this way, even if the tolerance between the main magnet 31 and the main magnet fixing portion 21 becomes relatively large, protrusion of the main magnet 31 can be suppressed, and the distance of the air gap 13 can be reduced to a necessary and sufficient extent.

As such, the rotating electric machine 100 of this embodiment comprises a stator 1 having slots 9 and stator windings 10, and a rotor 2 having permanent magnets 3 and a rotor core 12 and arranged with an air gap 13 between it and the stator 1. The permanent magnets 3 comprise main magnets 31 arranged at the magnetic pole center with their magnetic poles oriented in the radial direction of the rotor 2, and auxiliary magnets 32 adjacent to the main magnets 31 with their magnetic poles oriented in the circumferential direction, with the main magnets 31 and auxiliary magnets 32 arranged alternately on the surface of the rotor core 12 in a Halbach array. In a radial cross section of the rotor 2, the main magnets 31 are formed in a trapezoidal shape with the length of one side 31d facing the stator 1 being shorter than the length of the other side 31a located opposite the stator 1. The rotor core 12 has main magnet fixing portions 21 formed to correspond to the cross-sectional shape of the main magnets 31 on its surface facing the stator 1, and the main magnets 31 are fitted into the main magnet fixing portions 21.

In this configuration, by forming the main magnet 31 into a trapezoidal shape and fixing it to the main magnet fixing portion 21, the main magnet 31 is firmly fixed to the rotor core 12, increasing the holding strength of the main magnet 31 and making it possible to increase the durability of the rotor 2. Furthermore, because the main magnet 31 can be positioned so that it is exposed on the surface of the rotor 2, the main magnet 31 can be placed as close as possible to the surface of the stator 1 (the surface facing the tips of the teeth 8).

The rotating electric machine 100 of this embodiment realizes an outer rotor in which the rotor 2 is positioned on the outer diameter side of the stator 1.

Next, we will explain a modified example of this embodiment.

Figure 3 is a cross-sectional view perpendicular to the axial direction of a rotating electric machine 100 according to a modified example of this embodiment, showing part of the overall configuration.

The configuration shown in Figure 3 differs in that the auxiliary magnets 32 are fixed to the inner surface of the rotor core 12 and are arranged so that they are exposed on the surface of the rotor 2.

The auxiliary magnet 32 is located between adjacent main magnets 31, with the surface on the side opposite the stator 1 abutting against the auxiliary magnet fixing portion 22 of the rotor core 12 and fixed in place with adhesive.

The main magnets 31 are fixed by being fitted into groove-shaped main magnet fixing portions 21 formed in the rotor core 12. In the configuration shown in Figure 3, the groove depth of the main magnet fixing portions 21 is shorter in the radial direction compared to the configuration shown in Figure 1.

In this modified example, the auxiliary magnets 32 can be positioned so that they are exposed on the surface of the rotor 2, thereby increasing the effect of deflecting the magnetic flux of the main magnets 31 toward the stator 1 by the auxiliary magnets 32.

Figure 4 is a cross-sectional view perpendicular to the axial direction of a rotating electric machine 100 according to another modified example of this embodiment, showing part of the overall configuration.

The configuration shown in Figure 4 differs in that both circumferential side surfaces of the auxiliary magnet 32 abut against both circumferential side surfaces of the main magnet 31.

In a radial cross section of the rotor 2, the auxiliary magnet 32 is formed in a trapezoidal shape, with one side facing the stator 1 being longer than the other side located opposite the stator 1. Both side surfaces of this trapezoid are formed with an inclination that follows the side surfaces of the main magnet 31.

The main magnet 31 is fitted into and fixed in the groove-shaped main magnet fixing portion 21. In the configuration shown in Figure 4, the radial groove depth of the main magnet fixing portion 21 is configured to be short in the radial direction, similar to the configuration shown in Figure 3. Both side surfaces of the main magnet 31 are fitted into the main magnet fixing portion 21 near the other side (bottom side) located opposite the stator 1, and the area closer to the stator 1 than that is not in contact with the rotor core 12.

The auxiliary magnets 32 are arranged between the main magnets 31, and are configured so that both side surfaces of the main magnets 31 that do not contact the rotor core 12 abut against both side surfaces of the auxiliary magnets 32.

In this modified example, the main magnet 31 and auxiliary magnet 32 can be arranged without any gaps, which further enhances the effect of deflecting the magnetic flux of the main magnet 31 toward the stator 1 by the auxiliary magnet 32.

Figure 5 is a cross-sectional view perpendicular to the axial direction of a rotating electric machine 100 according to yet another modification of this embodiment, showing part of the overall configuration.

The configuration shown in Figure 5 is similar to that shown in Figure 4, but differs in that the auxiliary magnet 32 has an anchor portion 34 that protrudes radially outward from the rotor 2.

Similar to the configuration shown in Figure 4, the auxiliary magnet 32 is formed in a trapezoidal shape in a radial cross section of the rotor 2, with the length of one side facing the stator 1 being longer than the length of the other side located opposite the stator 1. Also, similar to the configuration described in Figure 4, the auxiliary magnet 32 is positioned so that both side surfaces abut against both side surfaces of the main magnet 31.

Furthermore, the auxiliary magnet 32 has an anchor portion 34 that protrudes radially outward from the other side located opposite the stator 1. The anchor portion 34 has a tapered shape that widens in diameter as it moves away from the stator 1. In other words, the anchor portion 34 is formed so that its width increases toward its tip. The rotor core 12 has a groove-shaped anchor groove 44 that is recessed from the auxiliary magnet 32 on the side opposite the stator 1.

When the anchor portion 34 of the auxiliary magnet 32 is fitted into the anchor groove 44 of the rotor core 12, the anchor portion 34 is supported on the inclined surface of the anchor groove 44, and the auxiliary magnet 32 is firmly fixed to the rotor core 12. This increases the holding strength of the auxiliary magnet 32 while positioning it so that it is exposed on the surface of the rotor 2.

Figure 6 is a cross-sectional view perpendicular to the axial direction of the rotating electric machine 100 of yet another modified example of this embodiment, showing part of the overall configuration.

The configuration shown in Figure 6 differs in that both side surfaces of the auxiliary magnet 32 are not in contact with the main magnet 31, but are in contact only with the inside of the auxiliary magnet fixing portion 22 formed in the rotor core 12.

As shown in FIG. 6, the inner circumferential surface of the rotor core 12 is formed with a main magnet fixing portion 21 that fixes the main magnet 31, and an auxiliary magnet fixing portion 22 that fixes the auxiliary magnet 32. The main magnet fixing portion 21 is configured as a groove that opens toward the inner circumferential surface of the rotor core 12, and its radial cross section is configured as a trapezoidal groove that corresponds to the shape of the main magnet 31. The auxiliary magnet fixing portion 22 is similarly configured as a groove that opens toward the inner circumferential surface of the rotor core 12, and its radial cross section is configured as a trapezoidal groove that corresponds to the shape of the auxiliary magnet 32 and is oriented in the opposite direction to the main magnet fixing portion 21.

A wall-like portion 211 is formed between the main magnet fixing portion 21 and the auxiliary magnet fixing portion 22, protruding toward the stator 1 to separate them. One circumferential side of the wall-like portion 211 is inclined to follow the side of the main magnet 31, and the other side is inclined to follow the side of the auxiliary magnet 32. These one and other sides are parallel to each other.

The auxiliary magnet 32 is fitted into the auxiliary magnet fixing portion 22, which is formed in a groove on the inner periphery of the rotor core 12, and fixed in place with adhesive or the like.

In this modified example, the auxiliary magnets 32 are configured to be fixed to the groove-shaped auxiliary magnet fixing portions 22, which allows the auxiliary magnets 32 to be positioned so that they are exposed on the surface of the rotor 2, while increasing the holding strength of the auxiliary magnets 32.

Figure 7 is a cross-sectional view perpendicular to the axial direction of a rotating electric machine 100 according to yet another modification of this embodiment, showing part of the overall configuration. Figure 8 is an enlarged view of part A in Figure 7.

The configuration shown in Figure 7 is similar to that shown in Figure 6, but differs in that the rotor core 12 is configured with claw portions 45 on the inner surface of the auxiliary magnets 32 that hold the auxiliary magnets 32 in the radial direction.

As described in Figure 6, the rotor core 12 is formed with a main magnet fixing portion 21 that fixes the main magnet 31 and an auxiliary magnet fixing portion 22 that fixes the auxiliary magnet 32.

As shown in Figure 8, a pair of claws 45 (45a, 45b) are formed on the surface side of the auxiliary magnet fixing portion 22, protruding circumferentially from both ends of the auxiliary magnet 32 to hold the auxiliary magnet 32 in the radial direction. Claws 45a and 45b are spaced apart, and the auxiliary magnet 32 is exposed to the stator 1 side between these claws 45a and 45b.

In this modified example, the auxiliary magnet fixing portion 22 has claw portions 45 that extend from the circumferential direction toward the circumferential center of the auxiliary magnet 32. This allows the auxiliary magnet 32 to be held by the claw portions 45 of the auxiliary magnet fixing portion 22, and the auxiliary magnet 32 can be positioned so that it is exposed on the surface of the rotor 2, further increasing the holding strength of the auxiliary magnet 32.

Furthermore, in the configuration shown in FIG. 8, the auxiliary magnet 32 is configured to be radially spaced away from the air gap 13 compared to the main magnet 31 due to the claw portion 45. This configuration prevents the magnetic flux of the auxiliary magnet 32 from acting on the stator 1 and causing iron loss in the stator 1. By reducing iron loss in the stator 1, it is possible to improve the torque efficiency of the rotating electric machine 100.

Figure 9 shows yet another variation of this embodiment, and is an enlarged view of the area corresponding to part A in Figure 7.

In the configuration shown in Figure 9, the auxiliary magnets 32 are fixed to the rotor core 12 by being inserted into auxiliary magnet fixing portions 22 formed to penetrate the rotor core 12 in the axial direction. The outer peripheral side of the auxiliary magnet fixing portions 22 (the surface facing the tips of the teeth 8) of the stator 1 is configured with curved portions 46 that curve in an arc from both ends of the auxiliary magnet 32 to the center toward the opposite side from the stator 1.

In this modified example, the curved portion 46, which is part of the rotor core 12 located between the auxiliary magnet 32 and the air gap 13 in the auxiliary magnet fixing portion 22 of the rotor core 12, is formed so as to curve toward the center of the auxiliary magnet 32. With this configuration, the cross-sectional area of the rotor core 12 located between the auxiliary magnet 32 and the air gap 13 decreases as the curved portion 46 approaches the center. This prevents the magnetic flux of the auxiliary magnet 32 from acting on the rotor core 12 and causing iron loss, while further increasing the holding strength of the auxiliary magnet 32 compared to the configurations shown in Figures 7 and 8 described above.

Figure 10 is a cross-sectional view perpendicular to the axial direction of a rotating electric machine 100 according to yet another modification of this embodiment.

The configuration shown in Figure 10 is an inner rotor type rotating electric machine 100 in which the rotor 2 is arranged on the outer periphery of the stator 1.

More specifically, as shown in FIG. 10, the rotating electric machine 100 comprises a circular stator 1 and a rotor 2 that is concentric with the stator 1 and is positioned on the inner periphery of the stator 1 with an air gap 13 between them. The inner periphery of the rotor 2 comprises a shaft hole 14 to which a rotor shaft 15 is fixed.

The main magnet 31 has a cross-sectional shape along its radial direction that is similar to that described in Figure 1, with long sides in the circumferential direction, and is formed into a trapezoid shape with the length of one side facing the stator 1 being shorter than the length of the other side located on the opposite side from the stator 1. The main magnet 31 is fixed to a main magnet fixing portion 21 formed to correspond to the shape of the main magnet 31 on the outer peripheral surface side of the rotor core 12.

The auxiliary magnets 32 are positioned between the main magnets 31 and have a rectangular cross-sectional shape along the radial direction. The auxiliary magnets 32 are fixed to the rotor core 12 by being inserted into the auxiliary magnet fixing portions 22 formed through the rotor core 12.

In this way, in the modified example shown in Figure 10, the rotor 2 is configured as an inner rotor placed inside the stator 1. Even in this configuration, the main magnet 31 is supported on the inclined surface of the main magnet fixing portion 21, so the main magnet 31 is firmly fixed to the rotor core 12. This increases the holding strength of the main magnet 31, making it possible to increase the durability of the rotor 2.

The above describes embodiments of the present invention, but these embodiments merely illustrate some 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.

Furthermore, although the main magnet 31 in this embodiment is rectangular, the upper surface facing the stator 1 may be formed in an arc shape to correspond to the shape of the outer peripheral surface of the stator 1 (the tip surfaces of the teeth 8).

Furthermore, the configurations of the main magnet 31 and auxiliary magnet 32 described in Figures 3 to 9 can also be applied to an inner rotor type rotating electric machine 100 as shown in Figure 10.

Claims (12)

A rotating electric machine comprising: a stator having slots and windings; and a rotor having a permanent magnet and a rotor core, the rotor being disposed between the stator and the rotor and an air gap being interposed therebetween,
The permanent magnets include main magnets arranged at the magnetic pole centers and having magnetic poles oriented in the radial direction of the rotor, and auxiliary magnets adjacent to the main magnets and having magnetic poles oriented in the circumferential direction, the main magnets and the auxiliary magnets being arranged alternately on the outer periphery of the rotor core in a Halbach array,
the main magnet is formed in a trapezoidal shape in a radial cross section of the rotor, with one side facing the stator being shorter than the other side positioned on the opposite side from the stator;
the rotor core has a groove-shaped main magnet fixing portion formed on the surface facing the stator in correspondence with the cross-sectional shape of the main magnet,
The main magnet is fitted into and fixed to the main magnet fixing portion.
Rotating electric motor. 2. The rotating electric machine according to claim 1,
The auxiliary magnet is formed in a trapezoidal shape in which the length of one side facing the stator is longer than the length of the other side located on the opposite side from the stator in a radial cross section of the rotor.
Rotating electric motor. 3. The rotating electric machine according to claim 2,
the main magnet is disposed so as to protrude from the main magnet fixing portion toward the stator side,
The auxiliary magnet has a side surface that abuts against a side surface of the main magnet that protrudes from the main magnet fixing portion.
Rotating electric motor. 2. The rotating electric machine according to claim 1,
the auxiliary magnet includes an anchor portion protruding in a radial direction from a surface opposite to a surface facing the stator, the anchor portion being formed so as to increase in width toward a tip thereof,
The rotor core has an anchor groove into which the anchor portion is fitted.
Rotating electric motor. 2. The rotating electric machine according to claim 1,
The rotor core includes a groove-shaped auxiliary magnet fixing portion formed on a surface facing the stator in accordance with a cross-sectional shape of the auxiliary magnet.
Rotating electric motor. 6. The rotating electric machine according to claim 5,
The auxiliary magnet is fitted into the auxiliary magnet fixing portion and fixed thereto, and one side of the auxiliary magnet facing the stator is exposed to the air gap.
Rotating electric motor. 6. The rotating electric machine according to claim 5,
The auxiliary magnet fixing portion has a claw portion extending from the circumferential direction toward the center of the auxiliary magnet in the circumferential direction.
Rotating electric motor. 2. The rotating electric machine according to claim 1,
the rotor core includes an auxiliary magnet fixing portion formed as a through hole,
The auxiliary magnet is embedded and fixed in the auxiliary magnet fixing portion.
Rotating electric motor. 8. The rotating electric machine according to claim 7,
a surface of the auxiliary magnet fixing portion facing the stator that is curved in an arc shape toward the auxiliary magnet;
Rotating electric motor. 2. The rotating electric machine according to claim 1,
the angles formed between the bottom of the main magnet fixing portion and the side portions at both ends in the circumferential direction are acuter than the angles formed between the other sides of the main magnet and the side surfaces at both ends in the circumferential direction,
Rotating electric motor. 2. The rotating electric machine according to claim 1,
When the number of slots of the stator is S, the number of magnet pole pairs of the rotor is R, and the number of pole pairs of the stator is P, S = R ± P.
Rotating electric motor. A rotating electric machine according to any one of claims 1 to 11,
The rotor is configured as an outer rotor disposed on the outer diameter side of the stator.
Rotating electric motor.