JP2022153918A - rotor and motor - Google Patents

Abstract

To provide a rotor and a motor that achieve further miniaturization and higher torque.SOLUTION: A rotor includes a rotor core having an inner core portion 31 arranged circumferentially on the radially outer side of a shaft and a plurality of outer core portions 32 arranged separately from each other along the radially outer side of the inner core portion along the circumferential direction, and magnets 40 arranged alternately with the outer core portions along the circumferential direction on the radially outer side of the shaft. The rotor core includes a first gap portion 33 located between the inner core portion and the outer core portion in the radial direction when viewed in the axial direction and located in the center of the outer core portion in the circumferential direction, a second gap portion 34 positioned radially inside the magnet and having a circumferential dimension shorter than the circumferential dimension of the magnet, and a bridge portion 42 connecting the inner core portion and the outer core portion. The two bridge portions are arranged in the circumferential direction with the second gap portion interposed therebetween, and from among the radially inner end faces of the magnet, the end on one side in the circumferential direction and the end on the other side in the circumferential direction are covered from the radially inner side.SELECTED DRAWING: Figure 4

Description

The present invention relates to rotors and motors.

Conventionally, a spoke-type motor is known in which permanent magnets are arranged radially around the central axis of a shaft. For example, Patent Literature 1 discloses a rotor having a rotor core provided with an annular inner core portion and a plurality of outer core portions alternately arranged with magnets along the circumferential direction. In order to achieve small size and high torque in a motor, it is necessary to efficiently flow a large amount of magnet magnetic flux to the stator. In the rotor core described in Patent Document 1, since the bridge portion connecting the inner core portion and the outer core portion is arranged on the q-axis between the magnetic poles, the magnetic flux from the magnets on both sides in the circumferential direction sandwiching the q-axis is It flows into the inner core through the bridge.

In Patent Document 2, a first magnetic flux barrier portion is provided on the q-axis between the magnetic poles, and a second magnetic flux barrier portion is provided radially inward of the magnet, thereby connecting the inner core portion and the outer core portion. A rotor having channels is disclosed.

Japanese Patent Publication No. 2012-517209 Japanese Patent No. 6385712

However, in the rotor core described in Patent Document 2, since the entire end surface located radially inside of the magnet is in contact with the second magnetic flux barrier portion, demagnetization occurs at the circumferential end portion of the end surface, resulting in poor torque performance. may decline. In the rotor core described in Patent Literature 2, the magnetic path of the bridge portion connecting the inner core portion and the outer core portion is linearly connected to the outer core portion in the radial direction. It cannot be said that the suppression of the flowing magnetic flux is sufficient.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and an object of the present invention is to achieve further miniaturization and higher torque in rotors and motors.

One aspect of the rotor of the present invention includes a shaft arranged along a central axis extending in the vertical direction, an inner core portion arranged radially outwardly of the shaft along the circumferential direction, and the inner core portion. A rotor core having a plurality of outer core portions arranged separately along the radially outer side along the circumferential direction, and magnets arranged alternately with the outer core portions along the radially outer side of the shaft along the circumferential direction. , wherein the rotor core includes a first gap portion radially positioned between the inner core portion and the outer core portion when viewed in the axial direction and positioned at the center of the outer core portion in the circumferential direction; a second gap portion positioned radially inside the magnet and having a circumferential dimension shorter than the circumferential dimension of the magnet; and a bridge portion connecting the inner core portion and the outer core portion, The two bridge portions are arranged in the circumferential direction with the second gap portion interposed therebetween, and each bridge portion connects an end portion on one side in the circumferential direction and an end portion on the other side in the circumferential direction of the radially inner end surface of the magnet. Cover from the inside in the radial direction.

One aspect of the motor of the present invention has the rotor described above and a stator facing the rotor in the radial direction with a gap therebetween.

According to one aspect of the present invention, further miniaturization and higher torque can be achieved in rotors and motors.

FIG. 1 is a cross-sectional view schematically showing the motor of this embodiment. FIG. 2 is a cross-sectional view showing part of the motor of this embodiment, taken along the line II--II in FIG. FIG. 3 is a sectional view showing part of the rotor of this embodiment. FIG. 4 is a cross-sectional view enlarging the periphery of the radially inner end of one of the plurality of magnets 40 . FIG. 5 is a cross-sectional view showing a modification of this embodiment.

Hereinafter, rotors and motors according to embodiments of the present invention will be described with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Also, in the drawings below, in order to make each configuration easier to understand, there are cases where the actual structure and the scale, number, etc. of each structure are different.

The Z-axis direction appropriately shown in each figure is a vertical direction in which the positive side is the "upper side" and the negative side is the "lower side." A central axis J appropriately shown in each figure is a virtual line parallel to the Z-axis direction and extending in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as the "axial direction", the radial direction around the central axis J is simply referred to as the "radial direction", and the central axis J is simply referred to as the "circumferential direction".

It should be noted that the vertical direction, upper side, and lower side are simply names for explaining the arrangement relationship of each part, and the actual arrangement relationship is not the arrangement relationship indicated by these names. There may be.

As shown in FIGS. 1 and 2, the motor 10 of this embodiment includes a housing 2, a rotor 20, a stator 60, a bearing holder 4, and bearings 5a and 5b. Housing 2 accommodates rotor 20, stator 60, bearing holder 4 and bearings 5a, 5b. The stator 60 faces the radially outer side of the rotor 20 with a gap therebetween. The stator 60 has a stator core 60a, an insulator 60b, and a plurality of coils 60c. A plurality of coils 60c are attached to the stator core 60a via insulators 60b. The bearing holder 4 holds the bearing 5b.

The rotor 20 of this embodiment is rotatable around the central axis J. As shown in FIG. The rotor 20 has a shaft 50 and a rotor body 12 . The shaft 50 has a columnar shape extending in the axial direction around the central axis J. As shown in FIG. The shaft 50 is rotatably supported around the central axis J by bearings 5a and 5b. The rotor body 12 is fixed to the outer peripheral surface of the shaft 50 . As shown in FIG. 2 , the rotor body 12 includes a rotor core 30 and multiple magnets 40 . That is, the rotor 20 includes a rotor core 30 and multiple magnets 40 .

The multiple magnets 40 are permanent magnets. As shown in FIG. 3, the plurality of magnets 40 are arranged at intervals in the circumferential direction. In this embodiment, the plurality of magnets 40 are arranged at regular intervals along the circumferential direction. The magnet 40 has an N pole and an S pole as magnetic poles arranged along the circumferential direction. The magnetic poles of the magnets 40 adjacent in the circumferential direction face each other with the same poles in the circumferential direction. That is, in a pair of magnets 40 adjacent in the circumferential direction, for example, when the magnetic pole on the other circumferential side of the magnet 40 positioned on one side in the circumferential direction is the N pole, the magnetic pole on the other side in the circumferential direction of the magnet 40 positioned on the other side in the circumferential direction The magnetic pole on the side is the north pole. Further, for example, when the magnetic pole on the other side in the circumferential direction of the magnet 40 positioned on the one side in the circumferential direction is the S pole, the magnetic pole on the one side in the circumferential direction of the magnet 40 positioned on the other side in the circumferential direction is the S pole. The magnet 40 has, for example, a rectangular parallelepiped shape. The magnet 40 has a rectangular shape extending radially when viewed along the axial direction.

Rotor core 30 is a magnetic body that is excited by magnet 40 . The rotor core 30 has an inner core portion 31 , a plurality of outer core portions 32 , a plurality of first gap portions 33 , a plurality of second gap portions 34 , and a plurality of bridge portions 42 .

As shown in FIG. 3 , the inner core portion 31 is arranged radially outward of the shaft 50 along the circumferential direction. The inner core portion 31 has an annular shape along the circumferential direction. In this embodiment, the inner core portion 31 has an annular shape centering on the central axis J. As shown in FIG. A shaft 50 is passed through the radially inner side of the inner core portion 31 . The inner core portion 31 and the shaft 50 are fixed by, for example, press fitting. The inner core portion 31 is arranged radially inwardly away from the plurality of magnets 40 .

The plurality of outer core portions 32 are arranged radially outward of the inner core portion 31 so as to be separated from each other along the circumferential direction. The plurality of outer core portions 32 are arranged at intervals in the circumferential direction. In this embodiment, the plurality of outer core portions 32 are arranged at regular intervals along the circumferential direction. The outer core portions 32 are arranged alternately with the magnets 40 along the circumferential direction. The outer core portion 32 is positioned radially outwardly away from the inner core portion 31 . The outer core portion 32 extends radially.

In the following description, a circumferential centerline C1 is shown as a virtual line passing through the center of the magnet 40 in the circumferential direction. The circumferential centerline C1 extends in a radial direction passing through the circumferential center of the magnet 40 . A circumferential centerline C1 is a magnetic pole centerline passing through the magnetic pole center. Both circumferential side surfaces of the magnet 40 are flat surfaces parallel to the axial direction and parallel to the circumferential centerline C1. In the magnet 40, the circumferential side away from the circumferential center line C1 is called "circumferential outer side", and the circumferential side near the circumferential center line C1 is called "circumferential inner side". In FIG. 3, the circumferential centerline C1 of one magnet 40 out of the plurality of magnets 40 is shown. A circumferential centerline C2 is shown as a virtual line passing through the center of the outer core portion 32 in the circumferential direction. The circumferential centerline C2 extends in a radial direction passing through the circumferential center of the outer core portion 32 . FIG. 3 shows the circumferential centerline C2 of the outer core portion 32 that is circumferentially adjacent to the magnet 40 whose circumferential centerline C1 is shown.

The circumferential dimension of the outer core portion 32 increases radially outward. The side surfaces on both sides in the circumferential direction of the outer core portion 32 are flat surfaces parallel to the axial direction and inclined to each other. The side surfaces on both sides in the circumferential direction of the outer core portion 32 are inclined in a direction away from the circumferential center line C2 toward the radially outer side when viewed along the axial direction. In the present embodiment, the side surface on one side in the circumferential direction of the outer core portion 32 is parallel to the center line C1 in the circumferential direction of the magnet 40 adjacent to the one side in the circumferential direction of the outer core portion 32 . In the present embodiment, the side surface of the outer core portion 32 on the other circumferential side is parallel to the circumferential center line C1 of the magnet 40 adjacent to the outer core portion 32 on the other circumferential side.

Protrusions 32 a and 32 b that protrude away from the circumferential center line C<b>2 are provided at radially outer end portions of both circumferential side surfaces of the outer core portion 32 . Although not shown, the protrusions 32a and 32b extend from the axially upper end of the outer core portion 32 to the lower end thereof. The radially outer end surface of the outer core portion 32 is a curved surface that is convex radially outward when viewed along the axial direction. A radially outer end surface of the outer core portion 32 is an arc-shaped curved surface centered on the central axis J. As shown in FIG. The protrusions 32a and 32b cover the magnet 40 from the radially outer side. Therefore, the corners including both circumferential ends on the radially outer side of the magnet 40 are covered with the outer core portion 32 and the projecting portions 32a and 32b. Therefore, the magnets 40 are prevented from protruding radially outward due to the centrifugal force that accompanies the rotation of the rotor 20 . When the corners of the magnet 40 are separated from the rotor core 30, demagnetization occurs and the magnetic properties tend to deteriorate. According to the present embodiment, since the corners of the magnet 40 are covered with the outer core portion 32 and the projecting portions 32a and 32b, deterioration of magnetic properties is suppressed.

When viewed in the axial direction, the second gap 34 is positioned radially inside the magnet 40 . The second gap 34 has a rectangular shape extending in the circumferential direction. The center of the second gap 34 in the circumferential direction is positioned on the circumferential centerline C1. The second gap portion 34 includes a side surface 34a located on one side in the circumferential direction, a side surface 34b located on the other side in the circumferential direction, an end surface 41 on the radially inner side of the magnet 40 located on the radially outer side, and the inner core portion 31. is surrounded by the radially outer surface of the The side surfaces 34a and 34b are parallel to the circumferential centerline C1. The circumferential dimension of the second gap portion 34 is shorter than the circumferential dimension of the magnet 40 . The side surface 34 a is positioned inside in the circumferential direction of the side surface positioned on one side in the circumferential direction of the magnet 40 . The side surface 34b is located on the inner side in the circumferential direction of the side surface located on the other side in the circumferential direction of the magnet 40 . Therefore, the end surface 41 of the magnet 40 faces the second gap portion 34 except for the circumferential end portion.

According to this embodiment, the circumferentially inner region of the end surface 41 of the magnet 40 faces the second gap portion 34 having a lower magnetic permeability than the rotor core 30 . The second gap 34 functions as a flux barrier. Therefore, the flow of magnetic flux radially inward from the magnetic pole (magnet 40 ) is blocked by the second gap portion 34 . For this reason, the magnetic flux can easily flow radially outward from the magnetic poles, and a decrease in drive torque can be suppressed.

The first gap portion 33 is located between the inner core portion 31 and the outer core portion 32 in the radial direction. The circumferential center of the first gap portion 33 is located on the circumferential centerline C2. When viewed in the axial direction, the outer circumference of the first gap 33 is a pentagonal shape that is symmetrical about the circumferential centerline C2.

FIG. 4 is a cross-sectional view enlarging the periphery of the radially inner end of one of the plurality of magnets 40 . In the following description, the first gap 33 on one side in the circumferential direction of the first gaps 33 positioned on both sides in the circumferential direction across the circumferential center line C1 of one magnet 40 among the plurality of first gaps 33 is called a first gap portion 33A, and the first gap portion 33 on the other side in the circumferential direction is called a first gap portion 33B. 33 A of 1st space|gap parts are located between 32 A of outer core parts and the inner core part 31 which are located in the circumferential direction one side from the circumferential direction centerline C1. The first gap portion 33B is located between the outer core portion 32B and the inner core portion 31 located on the other side in the circumferential direction with respect to the circumferential center line C1. Regarding the first gap portion 33A and the first gap portion 33B, the side away from the circumferential centerline C1 in the circumferential direction is called "circumferential outer side", and the side closer to the circumferential centerline C1 is called "circumferential inner side". call.

As shown in FIG. 4, the outer peripheries of the first gap portion 33A and the first gap portion 33B have sides 35a and 35b. The sides 35a and 35b are positioned circumferentially inward from the circumferential centerline C2. Side 35 a is parallel to side 34 a and side 34 b of second gap 34 . The side 35 a is positioned radially inward of the end face 41 of the magnet 40 . The position of the side 35a in the first gap portion 33A in the circumferential direction is circumferentially outer than the side surface 34a and circumferentially inner than the side surface of the magnet 40 on one side in the circumferential direction. That is, the outer circumference of the first gap portion 33</b>A positioned on one side in the circumferential direction of the magnet 40 on the side of the magnetic pole center is positioned on the other side in the circumferential direction of the end face 41 on the one side in the circumferential direction. As a result, the rotor core 30 has a constant circumferential width along the circumferential centerline C1 between the side surface 34a and the side 35a of the first gap 33A radially inward of the end surface 41 of the magnet 40. A region is provided that extends Therefore, it is possible to suppress the decrease in mechanical strength caused by the partial narrowing of the width of the region between the side surface 34a and the side 35a of the first cavity 33A.

The circumferential position of the side 35a of the first gap portion 33B is circumferentially outside the side surface 34b and circumferentially inside the side surface of the magnet 40 on the other side in the circumferential direction. That is, the outer circumference of the first gap portion 33</b>B positioned on the other side in the circumferential direction of the magnet 40 on the side of the magnetic pole center is positioned on the one side in the circumferential direction with respect to the end portion of the end surface 41 on the other side in the circumferential direction. As a result, the rotor core 30 has a constant circumferential width along the circumferential centerline C1 between the side surface 34b and the side 35a of the first gap 33B on the radially inner side of the end surface 41 of the magnet 40. A region is provided that extends Therefore, it is possible to suppress the decrease in the mechanical strength due to the partial narrowing of the width of the region between the side surface 34b and the side 35a of the first cavity 33B.

The side 35b is positioned radially inward of the end face 41 of the magnet 40 . Side 35 b is parallel to end surface 41 . The side 35b extends circumferentially outward from the radially outer end of the side 35a. Accordingly, the circumferentially inner end portion of the side 35b of the first gap portion 33A is located circumferentially outside the side surface 34a and circumferentially inside one side surface of the magnet 40 in the circumferential direction. That is, the radially outer periphery of the first gap portion 33</b>A positioned on one side in the circumferential direction of the magnet 40 is positioned radially inwardly of the end portion of the end surface 41 on the one side in the circumferential direction. As a result, in the rotor core 30, a region having a constant radial width extending along the end face 41 is formed between the end face 41 and the side 35b of the first gap portion 33A on the radially inner side of the end face 41 of the magnet 40. is provided. Therefore, it is possible to prevent the mechanical strength from deteriorating due to the partial narrowing of the width of the region between the end surface 41 and the side 35b of the first cavity 33A.

The circumferentially inner end of the side 35b of the first gap portion 33B is positioned circumferentially outside the side surface 34b and circumferentially inside the side surface of the magnet 40 on the other side in the circumferential direction. That is, the radially outer periphery of the first gap portion 33</b>B positioned on the other side in the circumferential direction of the magnet 40 is positioned radially inwardly of the end portion of the end surface 41 on the other side in the circumferential direction. As a result, in the rotor core 30, a region having a constant radial width extending along the end face 41 is provided between the end face 41 and the side 35b of the first gap portion 33B on the radially inner side of the end face 41 of the magnet 40. is provided. Therefore, it is possible to prevent the mechanical strength from deteriorating due to the partial narrowing of the width of the region between the end surface 41 and the side 35b of the first cavity 33B.

Two bridge portions 42 are arranged with the second gap portion 34 interposed therebetween in the circumferential direction. The two bridge portions 42 connect both ends of the outer core portion 32 in the circumferential direction and the inner core portion 31 . Therefore, the outer core portion 32 can be firmly connected to the inner core portion 31 . Therefore, the strength of rotor core 30 can be improved.

The bridge portion 42 has bridge portions 42A and 42B. 42 A of bridge|bridging parts are located in the circumferential direction one side of the 2nd space|gap part 34. As shown in FIG. The bridge portion 42B is located on the other circumferential side of the second gap portion 34 . The bridge portion 42A and the bridge portion 42B are line-symmetrical with respect to the circumferential centerline C1. Hereinafter, the description of the bridge portion 42B may be omitted for the same configuration as that of the bridge portion 42A except that it is linearly symmetrical with respect to the circumferential center line C1.

The bridge portion 42A has a first bridge portion 43A and a second bridge portion 44A. The first bridge portion 43A is a region of the rotor core 30 located between the end face 41 of the magnet 40 and the side 35b of the first gap portion 33A. According to the present embodiment, since the side 35b and the end surface 41 are parallel, the first bridge portion 43A has a constant radial width and extends in a direction perpendicular to the circumferential centerline C1. Therefore, it is possible to prevent the mechanical strength from deteriorating due to the partial narrowing of the width of the first bridge portion 43A.

The circumferentially inner end portion of the first bridge portion 43A is located circumferentially outside the side surface 34a and circumferentially inside the one side surface of the magnet 40 in the circumferential direction. A circumferentially outer end portion of the first bridge portion 43A is connected to the outer core portion 32A. That is, one end in the circumferential direction of the first bridge portion 43A is connected to the outer core portion 32A, and extends from the outer end portion in the circumferential direction of the end face 41 toward the magnetic pole center in the circumferential direction along the end face 41 .

The first bridge portion 43A covers the end face 41 of the magnet 40 from the inside in the radial direction. According to the present embodiment, since the first bridge portion 43A covers the end surface 41 from the radially inner side, it is possible to suppress demagnetization that tends to occur when the magnet 40 is separated from the rotor core 30, thereby suppressing deterioration in magnetic properties. According to this embodiment, the radially inner side of the magnet 40 can be positioned by covering the end face 41 of the magnet 40 from the radially inner side.

For example, when the bridge portion is linearly arranged on the circumferential center line C2, the magnetic flux from the magnets 40 located on both sides of the circumferential center line C2 in the circumferential direction is likely to escape radially inward. In contrast, according to the present embodiment, the first bridge portion 43A extending in the direction intersecting the circumferential centerline C2 is bent and connected to the outer core portion 32A extending along the circumferential centerline C2. Therefore, the flow of magnetic flux from the outer core portion 32A to the first bridge portion 43A is suppressed. For this reason, the magnetic flux can easily flow radially outward from the magnetic poles, and the torque can be increased.

The second bridge portion 44A is a region of the rotor core 30 located between the side surface 34a of the second gap 34 and the side 35a of the first gap 33A. According to the present embodiment, since the side surface 34a and the side 35a are parallel, the second bridge portion 44A has a constant width in the circumferential direction and extends parallel to the circumferential centerline C1. Therefore, it is possible to prevent the mechanical strength from deteriorating due to the partial narrowing of the width of the second bridge portion 44A.

The radially outer end of the second bridge portion 44A is connected to the circumferentially inner end of the first bridge portion 43A. A radial inner end portion of the second bridge portion 44A is connected to the inner core portion 31 . That is, the second bridge portion 44A extends radially inward from the other end of the first bridge portion 43A located on the magnetic pole center side and connects to the inner core portion 31 . The second bridge portion 44A crosses the first bridge portion 43A. The intersection angle between the first bridge portion 43A and the second bridge portion 44A is 90°. According to the present embodiment, the second bridge portion 44A extending radially inward in parallel with the circumferential centerline C1 intersects the first bridge portion 43A extending along the end surface 41 at an intersection angle of 90°. This suppresses the flow of magnetic flux from the first bridge portion 43A to the second bridge portion 44A. For this reason, the magnetic flux can easily flow radially outward from the magnetic poles, and the torque can be increased.

According to the present embodiment, two bridge portions 42 connecting the inner core portion 31 and the outer core portion 32 are arranged with the second gap portion 34 interposed in the circumferential direction, and the radially inner end surface 41 of the magnet 40 is provided. By covering both ends in the circumferential direction from the inner side in the radial direction, the flow of magnetic flux to the inner side in the circumferential direction can be suppressed while suppressing demagnetization. Therefore, according to this embodiment, high torque and miniaturization can be achieved.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. The various shapes, combinations, etc., of the constituent members shown in the above examples are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

Although the second bridge portions 44A and 44B extend parallel to the circumferential centerline C1 in the above embodiment, the present invention is not limited to this configuration.
FIG. 5 is a cross-sectional view showing a modification of this embodiment.
As shown in FIG. 5, the second bridge portions 44A and 44B gradually incline outward in the circumferential direction as they move radially inward from the circumferentially inner end portions of the first bridge portions 43A and 43B. It may be configured to intersect with the portions 43A and 43B at an acute angle.
By adopting this configuration, the magnetic flux from the first bridge portions 43A, 43B to the second bridge portions 44A, 44B becomes more difficult to flow. Therefore, according to this modified example, it becomes easier for the magnetic flux to flow radially outward from the magnetic pole, and it is possible to further increase the torque and reduce the size.

DESCRIPTION OF SYMBOLS 10... Motor 20... Rotor 30... Rotor core 31... Inner core part 32... Outer core part 33, 33A, 33B... First gap part 34... Second gap part 34a, 34b... Side surface 35a, 35b... Side 40... Magnet 41... End surface 42, 42A, 42B... Bridge part 43A, 43B... First bridge part 44A, 44B... Second bridge part 50... Shaft 60... Stator J... Center shaft

Claims (6)

a shaft arranged along a vertically extending central axis;
a rotor core having an inner core portion circumferentially disposed radially outwardly of the shaft and a plurality of outer core portions circumferentially circumferentially circumferentially disposed radially outwardly of the inner core portion; ,
magnets arranged alternately with the outer core portion along the circumferential direction on the radially outer side of the shaft;
with
The rotor core is
a first gap portion located between the inner core portion and the outer core portion in the radial direction when viewed in the axial direction and located in the center of the outer core portion in the circumferential direction;
a second gap portion positioned radially inside the magnet and having a circumferential dimension shorter than the circumferential dimension of the magnet;
a bridge portion connecting the inner core portion and the outer core portion;
has
The two bridge portions are arranged in the circumferential direction with the second gap portion interposed therebetween, and each bridge portion connects an end portion on one side in the circumferential direction and an end portion on the other side in the circumferential direction of the radially inner end surface of the magnet. A rotor that covers from the inside in the radial direction. The bridge portion
a first bridge portion that is connected to the outer core portion at one end in the axial direction in the circumferential direction and extends from the circumferential end portion of the end face toward the center of the magnetic pole in the circumferential direction along the end face;
a second bridge portion that intersects with the first bridge portion and extends radially inward from the other end of the first bridge portion located on the magnetic pole center side and connected to the inner core portion;
having
A rotor according to claim 1 . The first gap located on one side in the circumferential direction of the magnet when viewed in the axial direction,
the outer periphery on the magnetic pole center side in the circumferential direction is positioned on the other circumferential side of the end face on the one circumferential direction side,
the radially outer periphery is located radially inwardly of the one end portion of the end face in the circumferential direction;
The first gap located on the other side in the circumferential direction of the magnet,
the outer circumference on the magnetic pole center side in the circumferential direction is located on one circumferential side of the end face on the other circumferential direction side,
The outer circumference on the radially outer side is positioned radially inwardly of the end portion on the other circumferential side of the end surface,
3. A rotor according to claim 2. When viewed in the axial direction, both side surfaces in the circumferential direction of the second gap are parallel to a straight line extending in the radial direction and passing through the center of the magnetic pole,
The outer circumference of the first gap is
sides parallel to the side surfaces of the second gaps adjacent in the circumferential direction;
sides parallel to the end faces of the magnets adjacent in the circumferential direction;
is a pentagon with
A rotor according to claim 3. The intersection angle between the first bridge portion and the second bridge portion is 90°.
A rotor according to any one of claims 2 to 4. A rotor according to any one of claims 1 to 5;
a stator facing the rotor in the radial direction with a gap therebetween;
a motor.

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