CN111919361B - Rotor, motor, and electric power steering device - Google Patents
Rotor, motor, and electric power steering device Download PDFInfo
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- CN111919361B CN111919361B CN201980022271.8A CN201980022271A CN111919361B CN 111919361 B CN111919361 B CN 111919361B CN 201980022271 A CN201980022271 A CN 201980022271A CN 111919361 B CN111919361 B CN 111919361B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The rotor according to one embodiment of the present invention includes: a shaft having a central axis; a rotor core fixed to the shaft; and a magnet portion provided on a radially outer side surface of the rotor core. The rotor core has a plurality of recesses recessed radially inward from a radially outer side surface of the rotor core and facing the magnet portions in a radial direction. The plurality of recesses include a 1 st recess and a 2 nd recess as recesses, and the 1 st recess and the 2 nd recess are arranged at different positions in the axial direction so as to be offset from each other in the circumferential direction.
Description
Technical Field
The present invention relates to a rotor, a motor, and an electric power steering apparatus.
Background
In order to reduce cogging torque, a structure is known in which a skew is applied to a rotor. For example, international publication No. 2011/114574 describes a structure in which continuous inclination is applied to a ring magnet of a rotor.
Prior art literature
Patent literature
Patent document 1: international publication No. 2011/114574
Disclosure of Invention
Problems to be solved by the invention
However, in the case of applying continuous tilting as described above, it is necessary to tilt the magnetization of the ring magnet, which may take time. On the other hand, as another example described in international publication No. 2011/114574, the following method is also considered: the magnets are divided in the axial direction and the poles are circumferentially offset, whereby a step tilt is applied to the rotor. However, in this case, a plurality of magnets may be required to be mounted so as to be shifted in the circumferential direction, which may take time. As described above, when the rotor is inclined, the work for manufacturing the rotor may be increased.
In view of the above, an object of the present invention is to provide a rotor having a structure capable of reducing cogging torque and suppressing an increase in manufacturing effort. Another object of the present invention is to provide a motor having such a rotor. Another object of the present invention is to provide an electric power steering apparatus having such a motor.
Means for solving the problems
The rotor according to one embodiment of the present invention includes: a shaft having a central axis; a rotor core fixed to the shaft; and a magnet portion provided on a radially outer side surface of the rotor core. The rotor core has a plurality of recesses recessed radially inward from a radially outer side surface of the rotor core and facing the magnet portions in a radial direction. The plurality of concave portions include a 1 st concave portion and a 2 nd concave portion as the concave portions, and the 1 st concave portion and the 2 nd concave portion are arranged at different positions in the axial direction so as to be offset from each other in the circumferential direction.
The motor according to one embodiment of the present invention includes: the rotor; and a stator that is opposed to the rotor with a gap therebetween in a radial direction.
An electric power steering apparatus according to an embodiment of the present invention includes the motor.
Effects of the invention
According to one embodiment of the present invention, the cogging torque of the rotor can be reduced, and the increase in labor for manufacturing the rotor can be suppressed. In addition, since the cogging torque of the rotor is reduced, vibration and noise of the motor and the electric power steering apparatus can be suppressed.
Drawings
Fig. 1 is a cross-sectional view showing a motor of embodiment 1.
Fig. 2 is a perspective view showing a part of the rotor core according to embodiment 1.
Fig. 3 is a view showing a part of the rotor of embodiment 1, and is a sectional view taken along line III-III in fig. 1.
Fig. 4 is a graph showing an example of waveforms of cogging torque of the motor according to embodiment 1.
Fig. 5 is a perspective view showing a part of a rotor core according to a modification of embodiment 1.
Fig. 6 is a perspective view showing a part of the rotor core according to embodiment 2.
Fig. 7 is a cross-sectional view showing a part of the rotor of embodiment 2.
Fig. 8 is a graph showing an example of waveforms of cogging torque of the motor according to embodiment 2.
Fig. 9 is a graph showing an example of a waveform of motor torque of the motor according to embodiment 2.
Fig. 10 is a schematic diagram showing a schematic configuration of the electric power steering apparatus according to the present embodiment.
Detailed Description
The Z-axis direction appropriately shown in each drawing is a vertical direction with the positive side as the upper side and the negative side as the lower side. The central axis J shown in each figure is a virtual line extending in a direction parallel to the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the up-down direction is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". In each figure, the circumferential direction is appropriately indicated by an arrow θ.
In the circumferential direction, a side that advances counterclockwise when viewed from the upper side toward the lower side, that is, a side that advances in the direction of the arrow θ is referred to as a "circumferential side". The side that advances clockwise when viewed from the upper side toward the lower side in the circumferential direction, that is, the side that advances opposite to the direction of the arrow θ is referred to as the "circumferential other side". In the present embodiment, the upper side corresponds to one axial side. The terms "up and down", "upper side", and "lower side" are merely names for describing the relative positional relationship of the respective parts, and the actual arrangement relationship and the like may be other than the arrangement relationship and the like shown by these names.
As shown in fig. 1, the motor 10 of the present embodiment includes a rotor 20, a stator 30, a housing 11, a plurality of bearings 15 and 16, and a bearing holder 40. The rotor 20 includes a shaft 21, a rotor core 22, and a plurality of magnet portions 23, wherein the shaft 21 has a central axis J.
The shaft 21 extends in the up-down direction along the central axis J. In the example of the present embodiment, the shaft 21 has a cylindrical shape extending in the axial direction. The shaft 21 is rotatably supported about the central axis J by a plurality of bearings 15 and 16. The plurality of bearings 15, 16 are disposed at intervals in the axial direction and supported by the housing 11. The bearing 15 is held by the bearing holder 40, and is supported by the housing 11 via the bearing holder 40. The housing 11 has a cylindrical shape.
The rotor core 22 is a magnetic member. The rotor core 22 is, for example, a laminated steel sheet formed by laminating a plurality of electromagnetic steel sheets in the axial direction. The rotor core 22 has a cylindrical shape. As shown in fig. 2 and 3, the rotor core 22 has a polygonal outer shape when viewed in the axial direction. The radially outer side surface of rotor core 22 has a plurality of planar portions 22a arranged in the circumferential direction. Although not shown, in the example of the present embodiment, the rotor core 22 has an octagonal outer shape. The radially outer side surface of the rotor core 22 has 8 planar portions 22a arranged in the circumferential direction. The planar portion 22a is formed in a planar shape extending in a direction perpendicular to the radial direction. Planar portion 22a extends in the axial direction on the radially outer side surface of rotor core 22. Planar portion 22a is disposed over the entire axial length of the radially outer surface of rotor core 22. In the example of the present embodiment, the axial length of the planar portion 22a is greater than the circumferential length of the planar portion 22a. The planar portion 22a has a rectangular shape when viewed from the radially outer side.
The hole 22b penetrates the rotor core 22 in the axial direction. As shown in fig. 2 and 3, a plurality of hole portions 22b are arranged in rotor core 22 at intervals in the circumferential direction. Although not shown in the drawings, in the example of the present embodiment, the hole portions 22b are arranged at equal intervals in the circumferential direction in the rotor core 22. The plurality of hole portions 22b are located radially inward of the respective planar portions 22a. The hole 22b is circular in shape when viewed in the axial direction. According to the present embodiment, the weight of rotor core 22 is reduced by hole 22b, and thus, rotor core 22 can be reduced in weight and material cost.
The groove 22c is recessed radially inward from the radially outer side surface of the rotor core 22 and extends in the axial direction. Slot 22c is disposed over the entire axial length of the radially outer surface of rotor core 22. The groove 22c is disposed between a pair of planar portions 22a adjacent to each other in the circumferential direction on the radially outer side surface of the rotor core 22, and opens radially outward. A plurality of slots 22c are arranged in rotor core 22 at intervals in the circumferential direction. Although not shown, the slots 22c are arranged at equal intervals in the circumferential direction in the rotor core. The groove width of the groove portion 22c becomes smaller as it goes radially outward. The groove 22c has a wedge shape when viewed in the axial direction.
As shown in fig. 2, a plurality of 1 st concave portions 24a, 2 nd concave portions 24b, and 3 rd concave portions 24c are provided in the circumferential direction. The 1 st concave portion 24a, the 2 nd concave portion 24b, and the 3 rd concave portion 24c are provided for each planar portion 22a, respectively. That is, in the present embodiment, 8 1 st concave portion 24a, 2 nd concave portion 24b, and 3 rd concave portion 24c are provided. The 1 st concave portion 24a, the 2 nd concave portion 24b, and the 3 rd concave portion 24c are rectangular when viewed from the radially outer side.
The 1 st concave portion 24a, the 2 nd concave portion 24b, and the 3 rd concave portion 24c are arranged at different positions in the axial direction so as to be offset from each other in the circumferential direction. The 1 st concave portion 24a is located at the end portion on the other side in the circumferential direction in the lower side portion of the planar portion 22a. The 1 st recess 24a opens on the lower surface of the rotor core 22.
The 2 nd concave portion 24b is located above the 1 st concave portion 24a and on the circumferential side of the 1 st concave portion 24a. The 2 nd concave portion 24b is located at a central portion in the circumferential direction among central portions in the axial direction of the planar portion 22a. The other end portion in the circumferential direction of the 2 nd concave portion 24b is located at substantially the same position in the circumferential direction as the one end portion in the circumferential direction of the 1 st concave portion 24a. The lower end of the 2 nd recess 24b is located at substantially the same position in the axial direction as the upper end of the 1 st recess 24a.
The 3 rd recess 24c is located above the 2 nd recess 24b and on the circumferential side of the 2 nd recess 24b. The 3 rd recess 24c is located at one end in the circumferential direction in the upper side portion of the planar portion 22a. The 3 rd recess 24c is open on the upper surface of the rotor core 22. The end portion on the other side in the circumferential direction of the 3 rd concave portion 24c is located at substantially the same position in the circumferential direction as the end portion on the one side in the circumferential direction of the 2 nd concave portion 24b. The lower end of the 3 rd recess 24c is located at substantially the same position in the axial direction as the upper end of the 2 nd recess 24b.
In the present embodiment, the 1 st concave portion 24a, the 2 nd concave portion 24b, and the 3 rd concave portion 24c are arranged along the diagonal line of the rectangular planar portion 22a in each planar portion 22a. The 1 st concave portion 24a and the 3 rd concave portion 24c are arranged at the corner of the planar portion 22a. The 1 st concave portion 24a and the 3 rd concave portion 24c are arranged at positions symmetrical with respect to the 2 nd concave portion 24b as a center when viewed from the radial outside. In the present embodiment, the shape of the 1 st concave portion 24a and the shape of the 3 rd concave portion 24c are identical to each other.
In the present embodiment, the circumferential dimension of the 2 nd recess 24b is larger than the circumferential dimension of the 1 st recess 24a and the circumferential dimension of the 3 rd recess 24c. In the present embodiment, the axial dimensions of the 1 st concave portion 24a, the 2 nd concave portion 24b, and the 3 rd concave portion 24c are the same as each other. The inside of the 1 st concave portion 24a, the inside of the 2 nd concave portion 24b, and the inside of the 3 rd concave portion 24c are separated from each other.
As shown in fig. 3, the recess 24 is filled with an adhesive 28. The adhesive 28 contacts the bottom surface of the recess 24 and the radially inner surface of the magnet portion 23, and fixes the rotor core 22 and the magnet portion 23. This can improve the fixing strength between magnet unit 23 and rotor core 22.
As shown in fig. 2, a portion of rotor core 22 having the same axial position as that of 1 st recess 24a is referred to as 1 st portion 27a. A portion of rotor core 22 having the same axial position as that of 2 nd recess 24b is referred to as a 2 nd portion 27b. A portion of rotor core 22 having the same axial position as that of 3 rd recess 24c is referred to as 3 rd portion 27c, and 1 st portion 27a, 2 nd portion 27b, and 3 rd portion 27c are arranged in this order from the lower side toward the upper side. Part 1a is a lower side portion of rotor core 22. The 2 nd portion 27b is a central portion in the axial direction of the rotor core 22. Part 3b 27c is an upper side part of rotor core 22.
In the present embodiment, the magnet portion 23 is, for example, a permanent magnet. As shown in fig. 1 and 3, the magnet portion 23 has a columnar shape extending in the axial direction. As shown in fig. 3, the cross-sectional shape of the magnet portion 23 perpendicular to the axial direction is a substantially quadrangular shape that is long in the circumferential direction. The radially inner surface of the magnet portion 23 is a flat surface perpendicular to the radial direction. The radially outer surface of the magnet portion 23b is a curved surface protruding radially outward when viewed in the axial direction.
The magnet portion 23 is provided on the radially outer side surface of the rotor core 22. In the present embodiment, the magnet portion 23 is provided for each planar portion 22a. That is, in the present embodiment, 8 magnets are provided, for example. Although not shown, the plurality of magnet portions 23 are arranged at equal intervals along the circumferential direction over the entire circumference. The magnet portions 23 provided to each of the planar portions 22a are each an independent member.
Each magnet portion 23 is fixed so that the radially inner side surface thereof contacts the planar portion 22a. The circumferential dimension of the radially inner side surface of the magnet portion 23 is smaller than the circumferential dimension of the planar portion 22a. As shown in fig. 1, the axial dimension of the magnet portion 23 is the same as the axial dimension of the planar portion 22a.
Each magnet portion 23 is opposed to a plurality of concave portions 24 provided for each planar portion 22a in the radial direction. In the present embodiment, each magnet portion 23 is opposed to the 1 st concave portion 24a, the 2 nd concave portion 24b, and the 3 rd concave portion 24c provided in each planar portion 22a in the radial direction. The radially inner side surface of the magnet portion 23 closes the radially outer opening of each recess 24.
Fig. 4 is a graph showing an example of waveforms of cogging torque CT of the motor 10 according to the present embodiment. In fig. 4, the horizontal axis represents the rotation angle Φ in the circumferential direction, and the vertical axis represents the cogging torque CT. In fig. 4, the cogging torque CT1 generated in the 1 st portion 27a, the cogging torque CT2 generated in the 2 nd portion 27b, the cogging torque CT3 generated in the 3 rd portion 27c, and the cogging torque CTta generated in the rotor 20 as a whole are shown. The cogging torque CTta generated in the rotor 20 as a whole is a value obtained by adding the cogging torque CT1, the cogging torque CT2, and the cogging torque CT 3.
As shown in fig. 4, cogging torques CT1, CT2, and CT3 generated in the respective portions are phase-shifted from each other. This is considered to be because the recesses 24 that are offset in the circumferential direction are provided in each portion. Specifically, in the 1 st portion 27a, the 1 st concave portion 24a is provided on the other side in the circumferential direction. Therefore, the circumferential center of the magnetic flux density distribution of the magnetic flux that comes out from the magnet portion 23 to the radial outside or the magnetic flux that enters the magnet portion 23 from the radial outside is shifted to the circumferential side than the circumferential center of the planar portion 22a. In the following description, the "magnetic flux density distribution of the magnetic flux that comes out from the magnet portion 23 to the radial outside or the magnetic flux that enters the magnet portion 23 from the radial outside" will be simply referred to as "magnetic flux density distribution".
In the 2 nd portion 27b, a 2 nd concave portion 24b is provided at the center in the circumferential direction of the planar portion 22a. Therefore, the circumferential center of the magnetic flux density distribution coincides with the circumferential center of the planar portion 22a. In the 3 rd portion 27c, a 3 rd recess 24c is provided on one side in the circumferential direction. Therefore, the circumferential center of the magnetic flux density distribution is shifted to the other side in the circumferential direction than the circumferential center of the planar portion 22a. Thus, the circumferential centers of the magnetic flux density distribution are arranged so as to be shifted from each other in the circumferential direction in the 1 st, 2 nd and 3 rd portions 27a, 27b and 27c having different axial positions. Therefore, the phases of the cogging torque CT generated in the respective sections are offset from each other, and the cogging torque CTta generated in the rotor 20 as a whole can be reduced.
As described above, according to the present embodiment, the plurality of recesses 24 arranged offset from each other in the circumferential direction are provided at different positions in the axial direction on the radially outer side surface of the rotor core 22, so that the cogging torque CTta generated on the entire rotor 20 can be reduced. Therefore, no inclination needs to be applied to the rotor 20. Therefore, the cogging torque CTta generated in the entire rotor 20 can be reduced, and an increase in labor for manufacturing the rotor 20 can be suppressed.
Further, according to the present embodiment, the magnet portion 23 and the concave portions 24 are provided for each of the planar portions 22a. Therefore, the cogging torque CT can be reduced at each planar portion 22a, and the cogging torque CTta generated in the rotor 20 as a whole can be further reduced.
In addition, according to the present embodiment, the magnet portions 23 provided on the respective planar portions 22a are each one member, and are radially opposed to the plurality of concave portions 24 provided on the respective planar portions 22a. Therefore, the number of magnet portions 23 can be reduced as compared with the case where the magnet portions 23 are divided in the axial direction and the inclination is applied. This can suppress an increase in the number of components of the rotor 20, and further suppress an increase in the labor for manufacturing the rotor 20.
As described above, in the present embodiment, the recess 24 can reduce the cogging torque CT, and therefore, the magnet portion 23 does not need to be divided, and the magnetization of the magnet portion 23 does not need to be inclined. Therefore, the magnet portion 23 can be easily manufactured and the magnet portion 23 can be attached to the rotor core 22.
Further, according to the present embodiment, as the recess 24, a 1 st recess 24a, a 2 nd recess 24b, and a 3 rd recess 24c are provided, the circumferential positions of which are sequentially shifted from the other circumferential side to the one circumferential side. Therefore, the circumferential center of the magnetic flux density distribution can be gently changed in the axial direction, and the cogging torque CTta can be more appropriately reduced.
At the central portion in the axial direction of the planar portion 22a, the magnetic flux density of the magnetic flux passing through the portions on both sides in the circumferential direction of the 2 nd concave portion 24b is larger than the magnetic flux density of the magnetic flux passing through the 2 nd concave portion 24b. Further, the portions on both sides in the circumferential direction of the 2 nd recess 24b are connected to the portion on one side in the circumferential direction of the 1 st recess 24a and the portion on the other side in the circumferential direction of the 3 rd recess 24c, respectively. Therefore, the magnetic flux density distribution at the portion on the circumferential side of the 1 st concave portion 24a is easily made closer to the circumferential side by the magnetic flux passing through the portion on the circumferential side of the 2 nd concave portion 24b. In addition, the magnetic flux density distribution of the portion on the other circumferential side of the 3 rd concave portion 24c is easily made closer to the other circumferential side by the magnetic flux passing through the portion on the other circumferential side of the 2 nd concave portion 24b. Thus, the circumferential centers of the magnetic flux density distribution can be appropriately shifted in the circumferential direction in the 1 st portion 27a and the 3 rd portion 27c. Therefore, the cogging torque CT of each portion can be appropriately phase-shifted, and the cogging torque CTta of the rotor 20 as a whole can be further reduced.
According to the present embodiment, the 1 st concave portion 24a and the 3 rd concave portion 24c are arranged in point symmetry with respect to the 2 nd concave portion 24b as a center when viewed from the radially outer side. Therefore, the circumferential centers of the magnetic flux density distributions of the 1 st, 2 nd and 3 rd portions 27a, 27b and 27c are easily shifted at equal intervals in the circumferential direction. This can reduce the cogging torque CTta more appropriately. The shape of the 1 st portion 27a and the shape of the 3 rd portion 27c are easily taken as symmetrical shapes in the axial direction. Therefore, when the rotor core 22 is manufactured by laminating electromagnetic steel sheets, the 1 st portion 27a and the 3 rd portion 27c can be formed by using the same-shaped electromagnetic steel sheets by turning them in the axial direction. Therefore, the cost of manufacturing rotor core 22 can be reduced.
According to the present embodiment, the circumferential dimension of the 2 nd recess 24b is larger than the circumferential dimension of the 1 st recess 24a and the circumferential dimension of the 3 rd recess 24c. Therefore, the portions on both sides in the circumferential direction of the 2 nd concave portion 24b can be arranged farther apart in the circumferential direction at the planar portion 22a of the 2 nd portion 27b. Thus, the magnetic flux density distribution in the portion on the circumferential side of the 1 st concave portion 24a is easily made closer to the circumferential side by the magnetic flux passing through the portion on the circumferential side of the 2 nd concave portion 24b. The magnetic flux density distribution of the portion on the other circumferential side of the 3 rd concave portion 24c is easily made closer to the other circumferential side by the magnetic flux passing through the portion on the other circumferential side of the 2 nd concave portion 24b. Thus, the circumferential centers of the magnetic flux density distribution can be shifted more appropriately in the circumferential direction in the 1 st portion 27a and the 3 rd portion 27c. Therefore, the cogging torque CTta of the rotor 20 as a whole can be further reduced.
As shown in fig. 3, the rotor 20 also has a resin mold 26. The resin mold 26 covers at least a portion of the rotor core 22 and at least a portion of the magnet portion 23. At least a part of the resin mold 26 is located between circumferentially adjacent magnet portions 23. The resin molded portion 26 is manufactured by insert molding the rotor core 22 and the magnet portion 23 as insert members.
The resin mold portion 26 has an anchor portion 26a and a movement suppressing portion 26b. The anchor portion 26a is a portion provided in each groove portion 22c. The anchor portion 26a is produced by filling the groove portion 22c with a molten resin and solidifying the resin. The anchor portion 26a extends in the axial direction. The circumferential width of the anchor portion 26a becomes larger as it goes radially inward.
The movement suppressing portion 26b is located radially outward of the anchor portion 26a and is connected to the anchor portion 26 a. The movement suppressing portion 26b is disposed at an end portion of the resin mold portion 26 radially outward. The movement suppressing portions 26b protrude toward both sides in the circumferential direction with respect to the anchor portions 26a, respectively. The movement suppressing portion 26b has a plate shape with a plate surface facing in the radial direction. The movement suppressing portion 26b extends in the axial direction. The movement suppressing portion 26b is disposed radially outward of the planar portion 22a with a gap from the planar portion 22a. The movement suppressing portion 26b is disposed so as to overlap the planar portion 22a when viewed in the radial direction. The movement suppressing portion 26b contacts the radially outer surface of the magnet portion 23 b.
According to the present embodiment, a wedge-shaped groove 22c is provided on the radially outer side surface of rotor core 22. Thereby, the anchor portion 26a can be caught by the groove portion 22c in the radial direction. Therefore, the resin molded portion 26 can be prevented from falling off radially outward with respect to the rotor core 22. The movement suppressing portion 26b can press the magnet portion 23 from the radial outside. Therefore, detachment of the magnet portion 23 from the rotor core 22 can be suppressed by the resin mold portion 26.
As shown in fig. 1, the stator 30 includes a stator core 31, an insulator 30Z, and a plurality of coils 30C. Stator core 31 has a ring shape centered on central axis J. The stator core 31 surrounds the rotor 20 radially outside the rotor 20. The stator core 31 and the rotor 20 are opposed to each other with a gap therebetween in the radial direction. That is, the stator 30 and the rotor 20 are opposed to each other with a gap therebetween in the radial direction. The rotor core 22 is, for example, a laminated steel sheet formed by laminating a plurality of electromagnetic steel sheets in the axial direction.
The insulator 30Z is attached to the stator core 31. The insulator 30Z has a portion covering the teeth 31b. The material of the insulator 30Z is, for example, an insulating material such as a resin. The coil 30C is mounted to the stator core 31. The plurality of coils 30C are mounted on the stator core 31 via an insulator 30Z. The plurality of coils 30C are formed by winding wires around the teeth 31b via the insulators 30Z.
(modification of embodiment 1)
As shown in fig. 5, in the rotor core 122 of the present modification, the shape of the 1 st concave portion 124a and the shape of the 3 rd concave portion 124c are the same as the shape of the 2 nd concave portion 24b. That is, the shapes of the plurality of concave portions 124 are the same shape as each other. According to this structure, the plurality of concave portions 124 can be easily formed. In the rotor core 122, the recesses 124 arranged offset in the circumferential direction have portions with the same circumferential position. When viewed in the axial direction, the portion on one circumferential side of the 1 st concave portion 124a and the portion on the other circumferential side of the 2 nd concave portion 24b overlap each other. When viewed in the axial direction, the portion on the one circumferential side of the 2 nd concave portion 24b and the portion on the other circumferential side of the 3 rd concave portion 124c overlap each other. In the rotor core 122, the inside of the 1 st recess 124a and the inside of the 2 nd recess 24b are connected to each other. The inside of the 2 nd recess 24b and the inside of the 3 rd recess 124c are connected to each other. According to this structure, the circumferential dimension of each concave portion 124 is easily increased. Therefore, it is easier to shift the circumferential center of the magnetic flux density distribution in the circumferential direction.
< embodiment 2 >
As shown in fig. 6, in the rotor core 222 according to embodiment 1, the shape and arrangement of the concave portions 224 are different from those of the rotor core 222 according to embodiment 1. The rotor core 222 has a 1 st part 227a and a 2 nd part 227b. The 1 st part 227a is a lower side portion of the rotor core 222. The 2 nd part 227b is an upper side part of the rotor core 222. The 2 nd part 227b is located on the upper side of the 1 st part 227 a. In the present embodiment, the rotor core 222 is constituted only by the 1 st part 227a and the 2 nd part 227b. The 1 st part 227a and the 2 nd part 227b are identical in shape and axial dimensions to each other, and the 1 st part 227a and the 2 nd part 227b are stacked with a 45 ° offset in the circumferential direction. Therefore, according to the present embodiment, the 1 st part 227a and the 2 nd part 227b can be manufactured by stacking the same number of electromagnetic steel sheets of the same shape. Accordingly, the electromagnetic steel sheet constituting the rotor core 222 can be made of one type of electromagnetic steel sheet, and the labor and cost for manufacturing the rotor core 222 can be reduced.
In the present embodiment, each of the planar portions 222a is formed by connecting a radially outer side surface of the 1 st part 227a and a radially outer side surface of the 2 nd part 227b in the axial direction. In the example of the present embodiment, the axial length of the planar portion 222a is smaller than the circumferential length of the planar portion 222a. In the present embodiment, only one recess 224 out of the 1 st recess 224a and the 2 nd recess 224b is provided in each planar portion 222a. That is, in the present embodiment, the plurality of planar portions 222a include, as the planar portions 222a, a 1 st planar portion 222d provided with the 1 st concave portion 224a and a 2 nd planar portion 222e provided with the 2 nd concave portion 224b. The 1 st plane portion 222d and the 2 nd plane portion 222e are alternately arranged in the circumferential direction.
The 1 st concave portion 224a is provided on the radially outer side surface of the 1 st part 227a in the 1 st plane portion 222d. The 2 nd concave portion 224b is provided on the radially outer side surface of the 2 nd part 227b in the 2 nd planar portion 222e. Thus, the 1 st concave portion 224a is provided in plurality at intervals over the entire circumferential range in the circumferential direction on the radially outer side surface of the 1 st part 227 a. The 2 nd concave portion 224b is provided in plurality at intervals over the entire circumference in the circumferential direction on the radially outer side surface of the 2 nd part 227b. The 1 st concave portion 224a and the 2 nd concave portion 224b are alternately arranged in the circumferential direction as viewed in the axial direction. That is, when the plurality of concave portions 224 are viewed in the axial direction, the concave portions 224 adjacent to both circumferential sides of the 1 st concave portion 224a are the 2 nd concave portions 224b, and the concave portions 224 adjacent to both circumferential sides of the 2 nd concave portion 224b are the 1 st concave portions 224a.
The 1 st concave portion 224a and the 2 nd concave portion 224b are each rectangular in shape long in the circumferential direction when viewed from the radially outer side. The 1 st recess 224a is opened at the lower side. In the present embodiment, the 1 st concave portion 224a is provided on the entire surface of the 1 st plane portion 222d of the 1 st part 227a except for the edge portions on both sides in the circumferential direction. As shown in fig. 7, the 1 st concave portion 224a has a circumferential dimension substantially equal to that of the magnet portion 23 provided in the 1 st planar portion 222d. In the present embodiment, the 1 st concave portion 224a has a circumferential dimension slightly smaller than the circumferential dimension of the magnet portion 23 provided in the 1 st planar portion 222d. The radial dimension of the 1 st concave portion 224a is uniform over the entire range of the 1 st concave portion 224a.
The 2 nd recess 224b is open at the upper side. As shown in fig. 6, in the present embodiment, the 2 nd concave portion 224b is provided on the entire surface of the 2 nd plane portion 222e of the 2 nd portion 227b except for the edge portions on both sides in the circumferential direction. As shown in fig. 7, the circumferential dimension of the 2 nd concave portion 224b is substantially the same as the circumferential dimension of the magnet portion 23 provided in the 2 nd planar portion 222e. In the present embodiment, the circumferential dimension of the 2 nd concave portion 224b is slightly smaller than the circumferential dimension of the magnet portion 23 provided in the 2 nd planar portion 222e. The radial dimension of the 2 nd recess 224b is uniform over the entire range of the 2 nd recess 224b.
The circumferential dimensions of the 1 st concave portion 224a and the 2 nd concave portion 224b are the same as each other. The radial dimension of the 1 st concave portion 224a and the radial dimension of the 2 nd concave portion 224b are the same as each other. As shown in fig. 6, the axial dimension of the 1 st concave portion 224a and the axial dimension of the 2 nd concave portion 224b are identical to each other. The upper end of the 1 st concave portion 224a and the lower end of the 2 nd concave portion 224b are located at the same position as each other in the axial direction. As shown in fig. 7, in the present embodiment, the inside of the 2 nd concave portion 224b is a void. Although not shown, the inside of the 1 st concave portion 224a is also a void.
Fig. 8 is a graph showing an example of waveforms of cogging torque CT of the motor according to the present embodiment. In fig. 8, the horizontal axis represents the rotation angle Φ in the circumferential direction, and the vertical axis represents the cogging torque CT. In fig. 8, the cogging torque CT4 generated at the 1 st segment 227a, the cogging torque CT5 generated at the 2 nd segment 227b, and the cogging torque CTtb generated at the rotor 220 as a whole are shown. The cogging torque CTtb generated in the rotor 220 as a whole is a value obtained by adding the cogging torque CT4 and the cogging torque CT 5.
Fig. 9 is a graph showing an example of waveforms of the motor torque MT of the motor of the present embodiment. In fig. 9, the horizontal axis represents the rotation angle Φ in the circumferential direction, and the vertical axis represents the motor torque MT. In fig. 9, motor torque MT4 generated at section 1a, motor torque MT5 generated at section 2 227b, and motor torque MTt generated at rotor 220 as a whole are shown. The motor torque MTt generated in the rotor 220 as a whole is a value obtained by adding the motor torque MT4 and the motor torque MT 5.
As shown in fig. 8, the cogging torques CT4 and CT5 generated in the respective portions are phase-shifted from each other. This is considered to be because, as in embodiment 1, recesses 224 offset in the circumferential direction are provided in each portion. As a result, the phases of the cogging torque CT generated in the respective sections are offset from each other, and the cogging torque CTtb generated in the rotor 220 as a whole can be reduced. Therefore, no inclination needs to be applied to the rotor 220. Therefore, the cogging torque CTtb generated in the entire rotor 220 can be reduced, and an increase in labor for manufacturing the rotor 220 can be suppressed.
According to the present embodiment, the 1 st concave portions 224a and the 2 nd concave portions 224b provided at mutually different axial positions are alternately provided in the circumferential direction as viewed in the axial direction. Therefore, the phase of the cogging torque CT4 and the phase of the cogging torque CT5 are easily shifted by half a cycle to be inverted phases. Accordingly, the cogging torque CT4 and the cogging torque CT5 are easily appropriately offset, and the cogging torque CTtb generated in the rotor 220 as a whole can be more appropriately reduced.
According to the present embodiment, the 1 st planar portion 222d provided with the 1 st concave portion 224a and the 2 nd planar portion 222e provided with the 2 nd concave portion 224b are alternately arranged in the circumferential direction. The 1 st concave portion 224a is provided on the 1 st plane portion 222d of the 1 st part 227a, and the 2 nd concave portion 224b is provided on the 2 nd plane portion 222e of the 2 nd part 227b. Thus, in the 1 st part 227a, the portion where the 1 st concave portion 224a is provided and the portion where the concave portion 224 is not provided are alternately arranged in the circumferential direction. Here, the magnetic flux is less likely to pass through the inside of the 1 st concave portion 224a than the rotor core 222 as a magnetic member. Therefore, the 1 st planar portion 222d of the 1 st part 227a provided with the 1 st concave portion 224a is smaller in magnetic flux passing between the magnet portion 23 and the stator 30 than the 2 nd planar portion 222e of the 1 st part 227a provided with no concave portion 224. Thus, in the 1 st part 227a, the magnetic flux passing between the magnet part 23 and the stator 30 increases and decreases in the circumferential direction according to the planar part 222a and the magnet part 23. Therefore, as shown in fig. 9, the motor torque MT4 of the 1 st part 227a is periodically increased or decreased according to the rotation angle Φ.
On the other hand, in the 2 nd part 227b, a portion where the 2 nd concave portion 224b is provided and a portion where the concave portion 224 is not provided are alternately provided in the circumferential direction. Here, similarly to the inside of the 1 st concave portion 224a, the magnetic flux does not easily pass through the inside of the 2 nd concave portion 224b as compared with the rotor core 222 as a magnetic member. Therefore, similarly to the motor torque MT4 of the 1 st part 227a, the motor torque MT5 of the 2 nd part 227b is also periodically increased or decreased according to the rotation angle Φ.
The 1 st and 2 nd planar portions 222d and 222e are alternately arranged in the circumferential direction, and the 1 st and 2 nd concave portions 224a and 224b are alternately arranged in the circumferential direction as viewed in the axial direction. Therefore, when viewed in the axial direction, the portion in which the magnetic flux between the magnet portion 23 and the stator 30 in the 1 st part 227a is reduced and the portion in which the magnetic flux between the magnet portion 23 and the stator 30 in the 2 nd part 227b is reduced are alternately arranged in the circumferential direction. Thus, the phase of the motor torque MT4 and the phase of the motor torque MT5 are likely to be shifted by half a cycle to become reverse phases, and the fluctuation range of the motor torque MT4 and the fluctuation range of the motor torque MT5 cancel each other out. This can reduce the fluctuation range of the motor torque MTt of the entire rotor 220, and can reduce torque ripple.
The decrease in motor torque MT caused by the provision of the recess 224 is substantially equivalent to an increase in the radial distance between the stator 30 and the magnet portion 23 where the recess 224 is provided. In other words, according to the present embodiment, the recess 224 is provided appropriately without changing the radial distance between the magnet portion 23 and the stator 30, and the same effect as that obtained by changing the radial distance between the magnet portion 23 and the stator 30 can be obtained.
In addition, according to the present embodiment, the 1 st concave portion 224a is provided on the entire surface of the 1 st plane portion 222d of the 1 st part 227a except for the edge portions on both sides in the circumferential direction. Therefore, in the 1 st section 227a, the circumferential dimension of the 1 st concave portion 224a of the 1 st planar portion 222d can be made substantially the same as the circumferential dimension of the 2 nd planar portion 222e where the concave portion 224 is not provided. Thus, in the waveform of the motor torque MT4 of the 1 st part 227a, the period width of the increase in the motor torque MT4 and the period width of the decrease in the motor torque MT4 can be made substantially the same.
The 2 nd concave portion 224b is provided on the entire surface of the 2 nd flat portion 222e of the 2 nd part 227b except for the edges on both sides in the circumferential direction. Therefore, in the 2 nd part 227b, the circumferential dimension of the 2 nd concave portion 224b in the 2 nd plane portion 222e and the circumferential dimension of the 1 st plane portion 222d in which the concave portion 224 is not provided can be made substantially the same. Thus, in the waveform of the motor torque MT5 of the 2 nd part 227b, the period width of the increase in the motor torque MT5 and the period width of the decrease in the motor torque MT5 can be made substantially the same. Therefore, by shifting the waveform of the motor torque MT4 and the waveform of the motor torque MT5 by half a period, the phases are more likely to be inverted, and torque ripple can be more appropriately reduced.
In the waveforms of the cogging torques CT4 and CT5, the period width of the positive value of the cogging torque CT can be made substantially the same as the period width of the negative value of the cogging torque CT. Therefore, the waveform of the cogging torque CT4 and the waveform of the cogging torque CT5 are shifted by half a period, so that the phases are more likely to be inverted, and the cogging torque CTtb can be more suitably reduced.
In addition, the 1 st concave portion 224a is not provided at the edge portions on both circumferential sides in the 1 st plane portion 222d of the 1 st part 227 a. Therefore, the magnet portion 23 provided in the 1 st planar portion 222d can be supported from the radially inner side by the edge portions on the both sides in the circumferential direction of the 1 st concave portion 224a. This can hold the magnet portion 23 more stably in the 1 st plane portion 222d.
In addition, the 2 nd concave portion 224b is not provided at the edge portions on both circumferential sides in the 2 nd planar portion 222e of the 2 nd part 227b. Therefore, the magnet portion 23 provided in the 2 nd planar portion 222e can be supported from the radially inner side by the edge portions on both sides in the circumferential direction of the 2 nd concave portion 224b. This can hold the magnet portion 23 more stably in the 2 nd plane portion 222e.
In addition, according to the present embodiment, the 1 st part 227a and the 2 nd part 227b are identical in shape and axial dimension to each other, and the 1 st part 227a and the 2 nd part 227b are stacked in a staggered manner in the circumferential direction. Therefore, the period and amplitude of the waveform of the cogging torque CT of each section are substantially the same as each other. Thus, the waveform of the cogging torque CT4 and the waveform of the cogging torque CT5 are inverted phases, and the cogging torque CTtb can be more appropriately reduced. Similarly, the motor torque MT waveforms of the respective portions have substantially the same period and amplitude. Thus, the waveform of the motor torque MT4 and the waveform of the motor torque MT5 are in the reverse phase, so that torque ripple can be reduced more appropriately.
The present invention is not limited to the above embodiment, and other configurations may be adopted. The structure of the recess is not particularly limited as long as at least one 1 st recess and one 2 nd recess are provided at different positions in the axial direction so as to be offset from each other in the circumferential direction. The recesses arranged at different positions in the axial direction may be offset from each other in the axial direction, or may have a part of the same axial positions. For example, in the example of embodiment 1, the upper portions of the 1 st concave portions 24a and 124a and the lower portion of the 2 nd concave portion 24b may be located at the same position in the axial direction. The upper portion of the 2 nd recess 24b and the lower portions of the 3 rd recesses 24c and 124c may be located at the same position in the axial direction.
In embodiment 1, the 3 rd recess 24c may not be provided. In this case, for example, in the planar portion, the 1 st concave portion may be provided on the other side in the circumferential direction, and the 2 nd concave portion may be provided on one side in the circumferential direction. For example, in embodiment 1, the 2 nd recess 24b may not be provided, and only the 1 st recess 24a and the 3 rd recess 24c may be provided. In this case, for example, the 3 rd concave portion 24c corresponds to the 2 nd concave portion. The concave portion may not be provided in a part of the planar portion. The number of concave portions provided to each planar portion may also be different.
The shape of the plurality of concave portions is not particularly limited. The shape of the concave portion may be a circular shape or a polygonal shape other than a quadrangular shape. The inside of the recess may be filled with a non-magnetic member other than an adhesive, or may be a void. For example, in embodiment 1, the inside of the concave portion 24, 124 may be a void. In embodiment 2, a nonmagnetic member such as an adhesive may be filled in the recess 224.
The rotor core may be provided with 1 st and 2 nd recesses, and may have any structure. For example, in embodiment 1, rotor cores 22 and 122 may have a 2-stage structure or may have a 4-stage or more structure. For example, in embodiment 2, the rotor core 222 may have a 3-stage structure or more. In embodiment 2, in the case of the 3-stage structure, for example, a portion in which the 1 st recess is provided in the 1 st planar portion like the 1 st portion 227a is laminated on the upper side of the 2 nd portion 227b. In embodiment 2, in the case of the structure of 4 or more steps, for example, a portion in which the 1 st concave portion is provided in the 1 st plane portion like the 1 st portion 227a and a portion in which the 2 nd concave portion is provided in the 2 nd plane portion like the 2 nd portion 227b are alternately laminated on the upper side of the 2 nd portion 227b. In embodiment 2, in the case of the configuration of 3 or more steps, the total of the axial dimensions of the portions in which the 1 st concave portions are provided in the 1 st plane portion is made the same as the total of the axial dimensions of the portions in which the 2 nd concave portions are provided in the 2 nd plane portion, so that the cogging torque CT and the motor torque MT of each portion can be appropriately canceled, and the cogging torque CT and the torque ripple can be appropriately reduced.
The magnet portion provided on each planar portion may be divided into a plurality of portions in the axial direction. The shape of the rotor core is not particularly limited. The rotor core may have a cylindrical shape, for example. In this case, the magnet portion may be a cylindrical member. In this case, for example, a plurality of concave portions may be provided at positions radially opposed to the respective magnetic poles of the magnet portion.
The application of the motor according to the above embodiment is not particularly limited. The motor according to the above embodiment can be used for various devices such as a pump, a brake, a clutch, a vacuum cleaner, a dryer, a ceiling fan, a washing machine, and a refrigerator. As an example, an example in which the motor 10 according to the above embodiment is mounted in an electric power steering apparatus will be described.
As shown in fig. 10, the electric power steering apparatus 1 is mounted on a steering mechanism of a wheel of an automobile. The electric power steering device 1 is a device that reduces steering force by hydraulic pressure. The electric power steering device 1 of the present embodiment includes a motor 10, a steering shaft 314, an oil pump 316, and a control valve 317. Steering shaft 314 transmits input from steering wheel 311 to axle 313 having wheels 312. The oil pump 316 generates hydraulic pressure in the power cylinder 315, and the power cylinder 315 transmits a driving force based on the hydraulic pressure to the axle 313. The control valve 317 controls the oil of the oil pump 316. The electric power steering device 1 is equipped with a motor 10 as a driving source of an oil pump 316. The electric power steering apparatus 1 of the present embodiment includes the motor 10 of the present embodiment. Thus, the electric power steering apparatus 1 that achieves the same effects as the motor 10 described above is obtained. The motor mounted in the electric power steering apparatus 1 may be a motor having the rotor core 122 shown in fig. 5 or a motor having the rotor core 222 shown in fig. 6.
The above-described structures can be appropriately combined within a range not contradicting each other.
Claims (12)
1. A rotor, having:
a shaft having a central axis;
a rotor core fixed to the shaft; and
a magnet part provided on a radially outer side surface of the rotor core,
the rotor core has a plurality of recesses recessed from a radially outer side surface of the rotor core toward a radially inner side and opposed to the magnet portion in a radial direction,
the plurality of concave portions include a 1 st concave portion and a 2 nd concave portion as the concave portions, the 1 st concave portion and the 2 nd concave portion being arranged at different positions in the axial direction so as to be offset from each other in the circumferential direction,
the rotor core has:
part 1; and
a part 2 located on one axial side of the part 1,
when being observed along the axial direction, the appearance of the rotor iron core is polygonal,
the radially outer side surface of the rotor core has a plurality of planar portions arranged in the circumferential direction,
the magnet portion is provided at each of the planar portions,
the plurality of flat portions include a 1 st flat portion provided with the 1 st concave portion on a radially outer side surface of the 1 st portion and a 2 nd flat portion provided with the 2 nd concave portion on a radially outer side surface of the 2 nd portion as the flat portions,
the 1 st plane portion and the 2 nd plane portion are alternately arranged in the circumferential direction.
2. The rotor according to claim 1, wherein,
each of the magnets provided in each of the planar portions is a single member, and each of the magnets is radially opposed to the 1 st recess or the 2 nd recess provided in the planar portion.
3. The rotor according to claim 1 or 2, wherein,
the rotor core has a groove portion recessed from a radially outer side surface of the rotor core toward a radially inner side and extending in an axial direction,
the groove portions are arranged between a pair of the planar portions adjacent in the circumferential direction on the radially outer side surface of the rotor core, and open radially outward, and the groove widths of the groove portions become smaller as going radially outward.
4. The rotor according to claim 1 or 2, wherein,
the 1 st concave portion is provided with a plurality of concave portions at intervals apart from each other over the entire circumference in the circumferential direction on the radially outer side face of the 1 st portion,
the 2 nd concave portion is provided with a plurality of concave portions at intervals apart from each other over the entire circumference in the circumferential direction on the radially outer side face of the 2 nd portion,
the 1 st concave portion and the 2 nd concave portion are alternately arranged in the circumferential direction as viewed in the axial direction.
5. The rotor according to claim 1 or 2, wherein,
the 1 st concave portion is provided on the entire surface of the 1 st plane portion of the 1 st portion except for the edge portions on both sides in the circumferential direction,
the 2 nd concave portion is provided on the entire surface of the 2 nd planar portion of the 2 nd portion except for the edge portions on both sides in the circumferential direction.
6. The rotor according to claim 1 or 2, wherein,
the 1 st part and the 2 nd part have the same shape and axial dimensions as each other, and the 1 st part and the 2 nd part are stacked so as to be offset in the circumferential direction.
7. The rotor according to claim 1 or 2, wherein,
the inside of the 1 st concave portion and the inside of the 2 nd concave portion are connected to each other.
8. The rotor according to claim 1 or 2, wherein,
the shape of the plurality of concave portions is the same as each other.
9. The rotor according to claim 1 or 2, wherein,
the recess is filled with an adhesive.
10. The rotor according to claim 1 or 2, wherein,
the rotor core has a hole portion penetrating the rotor core in an axial direction,
the hole portions are arranged at intervals in the circumferential direction in the rotor core.
11. A motor, comprising:
the rotor of any one of claims 1 to 10; and
and a stator that faces the rotor with a gap therebetween in a radial direction.
12. An electric power steering apparatus having the motor according to claim 11.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-067714 | 2018-03-30 | ||
| JP2018067714 | 2018-03-30 | ||
| JP2018-119049 | 2018-06-22 | ||
| JP2018119049 | 2018-06-22 | ||
| PCT/JP2019/013098 WO2019189313A1 (en) | 2018-03-30 | 2019-03-27 | Rotor, motor, and electric power steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111919361A CN111919361A (en) | 2020-11-10 |
| CN111919361B true CN111919361B (en) | 2023-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980022271.8A Active CN111919361B (en) | 2018-03-30 | 2019-03-27 | Rotor, motor, and electric power steering device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7275436B2 (en) |
| CN (1) | CN111919361B (en) |
| WO (1) | WO2019189313A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022038727A1 (en) * | 2020-08-20 | 2022-02-24 | 三菱電機株式会社 | Rotor of rotating electric machine and rotating electric machine |
| WO2022244113A1 (en) * | 2021-05-18 | 2022-11-24 | 三菱電機株式会社 | Electric motor, compressor, and refrigeration circuit device |
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|---|---|---|---|---|
| JP2004023864A (en) * | 2002-06-14 | 2004-01-22 | Meidensha Corp | Rotor of permanent magnet rotary electric machine |
| CN1551462A (en) * | 2003-02-14 | 2004-12-01 | 株式会社萌力克 | Magnetic field type of rotary electric apparatus |
| CN101938204A (en) * | 2009-06-30 | 2011-01-05 | 株式会社日立制作所 | Permanent magnet rotary motor and elevator device employing the same |
| CN105229906A (en) * | 2013-04-22 | 2016-01-06 | 三菱电机株式会社 | Permanent magnet-type motor |
| CN106253517A (en) * | 2015-06-10 | 2016-12-21 | 日本电产高科电机株式会社 | The manufacture method of rotor, motor and rotor |
| CN205911850U (en) * | 2015-08-10 | 2017-01-25 | 日本电产株式会社 | Rotor and motor |
-
2019
- 2019-03-27 WO PCT/JP2019/013098 patent/WO2019189313A1/en active Application Filing
- 2019-03-27 CN CN201980022271.8A patent/CN111919361B/en active Active
- 2019-03-27 JP JP2020509165A patent/JP7275436B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004023864A (en) * | 2002-06-14 | 2004-01-22 | Meidensha Corp | Rotor of permanent magnet rotary electric machine |
| CN1551462A (en) * | 2003-02-14 | 2004-12-01 | 株式会社萌力克 | Magnetic field type of rotary electric apparatus |
| CN101938204A (en) * | 2009-06-30 | 2011-01-05 | 株式会社日立制作所 | Permanent magnet rotary motor and elevator device employing the same |
| CN105229906A (en) * | 2013-04-22 | 2016-01-06 | 三菱电机株式会社 | Permanent magnet-type motor |
| CN106253517A (en) * | 2015-06-10 | 2016-12-21 | 日本电产高科电机株式会社 | The manufacture method of rotor, motor and rotor |
| CN205911850U (en) * | 2015-08-10 | 2017-01-25 | 日本电产株式会社 | Rotor and motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2019189313A1 (en) | 2021-03-25 |
| JP7275436B2 (en) | 2023-05-18 |
| WO2019189313A1 (en) | 2019-10-03 |
| CN111919361A (en) | 2020-11-10 |
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