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WO2020008979A1 - Rotor et moteur - Google Patents

Rotor et moteur Download PDF

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Publication number
WO2020008979A1
WO2020008979A1 PCT/JP2019/025426 JP2019025426W WO2020008979A1 WO 2020008979 A1 WO2020008979 A1 WO 2020008979A1 JP 2019025426 W JP2019025426 W JP 2019025426W WO 2020008979 A1 WO2020008979 A1 WO 2020008979A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnet
radial
rotor
axial direction
magnet portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/025426
Other languages
English (en)
Japanese (ja)
Inventor
明 一円
秀幸 金城
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Priority to CN201980043694.8A priority Critical patent/CN112368910B/zh
Priority to JP2020528822A priority patent/JP7363783B2/ja
Publication of WO2020008979A1 publication Critical patent/WO2020008979A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a rotor and a motor.
  • a motor has a rotor and a stator.
  • the rotor has at least one magnet. To reduce vibration and noise generated by the motor, it is necessary to reduce both cogging torque and torque ripple.
  • the conventional motor reduces the cogging torque by providing a projection or skew that causes phase inversion.
  • the skew is disclosed, for example, in Japanese Patent Laid-Open Publication No. 2014-112265. Also, the torque ripple was reduced by increasing the sine wave ratio of the induced voltage.
  • the cogging torque is a general measure to cancel the phase by generating an opposite phase by applying skew.
  • applying the skew causes a decrease in torque.
  • the cogging torque and the torque ripple have a trade-off relationship with respect to the skew angle, and it is difficult to reduce both the cogging torque and the torque ripple.
  • One aspect of the rotor of the present invention is a shaft having a central axis, a rotor core fixed to the shaft, a plurality of magnet units arranged in a circumferential direction and an axial direction on a radially outer surface of the rotor core, wherein the plurality of magnet parts are a first magnet part, and a radial position of a radial outer surface is radially inner than a radial position of a radial outer surface of the first magnet part.
  • a first magnet portion and a second magnet portion arranged in the axial direction.
  • One aspect of the present invention is a motor including the rotor described above and a stator that faces the rotor with a gap in the radial direction, wherein the stator has an annular shape centered on the central axis.
  • the radial outer surface of the second magnet portion and the radial inner surface of the tooth The radial gap between them is large.
  • the cogging torque can be reduced while suppressing the torque reduction, and the torque ripple can be reduced.
  • FIG. 1 is a schematic sectional view of a rotor and a motor according to one embodiment.
  • FIG. 2 is a perspective view of a rotor according to one embodiment.
  • FIG. 3 is an enlarged sectional view showing a part of the section taken along the line III-III of FIG.
  • FIG. 4 is an enlarged sectional view showing a part of the IV-IV section of FIG.
  • FIG. 5 is a graph showing a waveform of a cogging torque of the motor according to the embodiment.
  • FIG. 6 is a graph showing a waveform of a torque ripple of the motor according to the embodiment.
  • FIG. 7 is a schematic diagram illustrating an electric power steering device using a motor according to one embodiment.
  • FIG. 1 is a schematic sectional view of a rotor and a motor according to one embodiment.
  • FIG. 2 is a perspective view of a rotor according to one embodiment.
  • FIG. 3 is an enlarged sectional view showing a part of the section taken along the line III
  • FIG. 8 is a schematic cross-sectional view illustrating a modified example of the rotor and the motor according to the embodiment.
  • FIG. 9 is a perspective view illustrating a rotor according to a modification of the embodiment.
  • FIG. 10 is an enlarged cross-sectional view showing a part of the cross section of the first portion of the rotor of FIG.
  • FIG. 11 is an enlarged cross-sectional view showing a part of a cross section of a second portion of the rotor of FIG. 9.
  • the axial direction of the central axis J that is, a direction parallel to the vertical direction is simply referred to as “axial direction”
  • the radial direction around the central axis J is simply referred to as “radial direction”
  • the upper side (+ Z) corresponds to one side in the axial direction
  • the lower side (-Z) corresponds to the other side in the axial direction.
  • the terms “upper direction”, “upper side” and “lower side” are simply names for describing the relative positional relationships of the respective parts, and the actual arrangement relations and the like are arrangement relations other than the arrangement relations and the like indicated by these names. You may.
  • the motor 10 of the present embodiment includes a rotor 20, a stator 30, a housing 11, and a plurality of bearings 15, 16.
  • the rotor 20 includes a shaft 21 having a central axis J, a rotor core 22, and a plurality of magnet parts 23 and 24.
  • the shaft 21 extends vertically along the central axis J.
  • the shaft 21 has a cylindrical shape extending in the axial direction.
  • the shaft 21 is rotatably supported around a central axis J by a plurality of bearings 15 and 16.
  • the plurality of bearings 15 and 16 are arranged at intervals in the axial direction, and are supported by the housing 11.
  • the housing 11 is cylindrical.
  • the shaft 21 is fixed to the rotor core 22 by press-fitting or bonding. That is, the rotor core 22 is fixed to the shaft 21.
  • the shaft 21 may be fixed to the rotor core 22 via a resin member or the like. That is, the shaft 21 is directly or indirectly fixed to the rotor core 22.
  • the shaft 21 is not limited to the above-mentioned cylindrical shape, and may be, for example, a cylindrical shape.
  • 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 is cylindrical.
  • the outer shape of the rotor core 22 is polygonal when viewed from the axial direction.
  • the radially outer surface of the rotor core 22 has a plurality of mounting surface portions 22a arranged in the circumferential direction.
  • the outer shape of the rotor core 22 is an octagon.
  • the radial outer surface of the rotor core 22 has eight mounting surface portions 22a arranged in the circumferential direction.
  • the mounting surface portion 22a is a flat surface extending in a direction perpendicular to the radial direction.
  • the mounting surface 22a has a square shape when viewed from the outside in the radial direction.
  • the mounting surface portion 22a extends in the axial direction on a radially outer surface of the rotor core 22.
  • the mounting surface portion 22a is disposed on the radially outer surface of the rotor core 22 over the entire axial length.
  • the axial length of the mounting surface 22a is larger than the circumferential length.
  • the rotor core 22 has a through hole 22h, a hole 22b, and a groove 22c. When viewed from the axial direction, the through hole 22h is arranged at the center of the rotor core 22. The through hole 22h penetrates the rotor core 22 in the axial direction. The shaft 21 is inserted into the through hole 22h.
  • the hole 22b penetrates the rotor core 22 in the axial direction.
  • the plurality of holes 22b are arranged on the rotor core 22 at intervals in the circumferential direction.
  • the holes 22b are arranged in the rotor core 22 at equal intervals in the circumferential direction.
  • the hole 22b has a circular shape.
  • the present invention is not limited thereto, and the hole 22b may have a shape other than the circular shape, such as a polygonal shape or an elliptical shape, as viewed from the axial direction.
  • the rotor core 22 is lightened by the holes 22b, so that the weight and material cost of the rotor core 22 can be reduced.
  • the groove 22c is recessed radially inward from the radially outer surface of the rotor core 22 and extends in the axial direction.
  • the groove 22c is arranged on the radially outer surface of the rotor core 22 over the entire length in the axial direction.
  • the groove portion 22c is disposed between a pair of circumferentially adjacent mounting surface portions 22a on the radially outer surface of the rotor core 22 and opens radially outward.
  • the plurality of grooves 22c are arranged on the rotor core 22 at intervals in the circumferential direction.
  • the grooves 22c are arranged on the rotor core 22 at equal intervals in the circumferential direction.
  • the groove width of the groove portion 22c decreases toward the outside in the radial direction.
  • the groove 22c has a wedge shape.
  • the groove 22c may have a shape other than the wedge shape.
  • the magnet parts 23 and 24 are permanent magnets.
  • a plurality of magnet parts 23 and 24 are provided on the radial outer surface of the rotor core 22.
  • the plurality of magnet portions 23 and 24 are arranged on the radially outer surface of the rotor core 22 in the circumferential direction and the axial direction, respectively.
  • the magnets 23 and 24 are provided on the mounting surface 22a.
  • the magnet portions 23 and 24 arranged in the axial direction are arranged without any gap in the axial direction.
  • the magnet portions 23 and 24 arranged in the circumferential direction are arranged at intervals in the circumferential direction.
  • a groove 22c is arranged between a pair of circumferentially adjacent magnets 23 and 24.
  • the magnet parts 23 and 24 are plate-shaped.
  • the plate surfaces of the magnet parts 23 and 24 face the radial direction.
  • the magnet parts 23 and 24 are square when viewed from the radial direction.
  • the magnet portions 23 and 24 have a circumferential length greater than a radial length.
  • the radial thickness of the magnet portions 23 and 24 increases from the both ends in the circumferential direction of the magnet portions 23 and 24 toward the central portion in the circumferential direction (inward in the circumferential direction).
  • the radial inner surfaces of the magnet portions 23 and 24 are linear.
  • the radially inner side surfaces of the magnet portions 23 and 24 have a flat shape extending in a direction perpendicular to the radial direction.
  • the radially inner side surfaces of the magnet portions 23 and 24 have a square shape when viewed from the radially inner side.
  • the radial inner surfaces of the magnet parts 23 and 24 come into contact with the mounting surface part 22a.
  • the radially outer surfaces of the magnet portions 23 and 24 When viewed from the -axis direction, the radially outer surfaces of the magnet portions 23 and 24 have a convex curve shape.
  • the radially outer surfaces of the magnet portions 23 and 24 have a curved surface that protrudes radially outward when viewed from the axial direction.
  • the radial outer surfaces of the magnet portions 23 and 24 have the same shape.
  • the radius of curvature of the radially outer surface of the magnet portion 23 and the radius of curvature of the radially outer surface of the magnet portion 24 are the same.
  • the radially outer surfaces of the magnet portions 23 and 24 are square when viewed from the radially outer side.
  • the radially outer surfaces of the magnet portions 23 and 24 radially oppose teeth 31 b of the stator 30, which will be described later.
  • the radial positions at both ends in the circumferential direction are radially inner than the radial positions at the central portion in the circumferential direction.
  • the radially outer surfaces of the magnet portions 23 and 24 are located at the radially outermost portion in the circumferential direction, and extend from the central portion in the circumferential direction to both sides (one side and the other side) in the circumferential direction. Located inside.
  • the plurality of magnet units 23, 24 have a first magnet unit 23 and a second magnet unit 24.
  • a plurality of first magnet portions 23 are provided on a radially outer surface of the rotor core 22.
  • the plurality of second magnet portions 24 are provided on the radially outer surface of the rotor core 22.
  • the axial length of the first magnet portion 23 and the axial length of the second magnet portion 24 are the same.
  • the circumferential length of the first magnet portion 23 and the circumferential length of the second magnet portion 24 are the same.
  • the radial position of the portion where the first magnet portion 23 is arranged and the radial position of the portion where the second magnet portion 24 is arranged are the same among the radial outer surfaces of the rotor core 22. It is. That is, the radial position of the mounting surface portion 22a where the first magnet portion 23 is disposed is the same as the radial position of the mounting surface portion 22a where the second magnet portion 24 is disposed. According to the present embodiment, the structure of the rotor core 22 can be simplified since the mounting surface portion 22a is disposed at a predetermined position in the radial direction regardless of the type of the magnet portions 23 and 24 mounted on the mounting surface portion 22a.
  • the radial thickness of the second magnet portion 24 is smaller than the radial thickness of the first magnet portion 23.
  • the radial position of the radial outer surface 24a of the second magnet portion 24 is radially inner than the radial position of the radial outer surface 23a of the first magnet portion 23.
  • the circumferential central portion of the radial outer surface 24a of the second magnet portion 24 is located radially inward with respect to the radial central portion of the radial outer surface 23a of the first magnet portion 23.
  • Both circumferential ends of the radial outer surface 24a of the second magnet portion 24 are located radially inward with respect to circumferential ends of the radial outer surface 23a of the first magnet portion 23.
  • the center of the central axis J is passed through a portion (a central portion in the circumferential direction in the present embodiment) of the radially outer surface 23a of the first magnet portion 23 that is located on the radially outer side.
  • the entire radially outer surface 24a of the second magnet portion 24 is arranged radially inward.
  • the first magnet section 23 and the second magnet section 24 are arranged in the axial direction. When viewed from the axial direction, the first magnet section 23 and the second magnet section 24 are arranged so as to overlap each other.
  • the first magnet portion 23 and the second magnet portion 24 arranged in the axial direction are arranged such that their respective central portions in the circumferential direction overlap each other when viewed from the axial direction.
  • the first magnet portion 23 and the second magnet portion 24 arranged in the axial direction are arranged such that both ends in the circumferential direction overlap with each other when viewed from the axial direction.
  • first magnet part 23 and the second magnet part 24 arranged in the axial direction one end in the circumferential direction of the first magnet part 23 and one end in the circumferential direction of the second magnet part 24 Overlap each other when viewed from the axial direction.
  • first magnet part 23 and the second magnet part 24 arranged in the axial direction the other end in the circumferential direction of the first magnet part 23 and the other end in the circumferential direction of the second magnet part 24 Overlap each other when viewed from the axial direction. For this reason, no skew is applied to the plurality of magnet sections 23, 24, and the first magnet section 23 and the second magnet section 24 are arranged straight in the axial direction.
  • first portion S1 In the first portion (first step, first area) S1 along the axial direction of the radially outer surface of the rotor core 22, the first magnet portions 23 and the second magnet portions 24 alternate in the circumferential direction.
  • Array In the first portion S1, a plurality of magnet portions 23 and 24 are arranged on the radially outer surface of the rotor core 22 at equal intervals in the circumferential direction.
  • second portion S2 of the radial outer surface of the rotor core 22 that is different from the first portion S1 along the axial direction, the first magnet portion 23 and the second magnet portion 24 are provided. Are alternately arranged in the circumferential direction.
  • a plurality of magnet portions 23 and 24 are arranged on the radially outer surface of the rotor core 22 at equal intervals in the circumferential direction. That is, the radially outer surface of the rotor core 22 has the first portion S1 and the second portion S2.
  • the first magnet portion 23 of the first portion S1 and the second magnet portion 24 of the second portion S2 are arranged so as to overlap.
  • the second magnet portion 24 of the first portion S1 and the first magnet portion 23 of the second portion S2 are arranged so as to overlap.
  • the first magnet portion 23 is disposed on one of the first portion S1 and the second portion S2, and the second magnet portion 24 , One of the first portion S1 and the second portion S2.
  • both ends of the first magnet portion 23 in the circumferential direction and both ends of the mounting surface portion 22a in the circumferential direction are arranged so as to overlap when viewed from the radial direction.
  • each circumferential position at both ends in the circumferential direction of the mounting surface portion 22a is slightly outside in the circumferential direction from each circumferential position at both ends in the circumferential direction of the first magnet portion 23. You. That is, the circumferential length of the mounting surface portion 22a is larger than the circumferential length of the first magnet portion 23.
  • both ends in the circumferential direction of the second magnet portion 24 and both ends in the circumferential direction of the mounting surface portion 22a are arranged so as to overlap when viewed from the radial direction.
  • the respective circumferential positions at both ends in the circumferential direction of the mounting surface portion 22a are respectively arranged slightly outside in the circumferential direction than the respective circumferential positions at both ends in the circumferential direction of the second magnet portion 24. You. That is, the circumferential length of the mounting surface portion 22a is larger than the circumferential length of the second magnet portion 24.
  • FIG. 5 is a graph showing a cogging torque waveform of the motor 10 including the rotor 20 of the present embodiment.
  • the waveform C1 of the cogging torque generated in the first portion S1 and the waveform C2 of the cogging torque generated in the second portion S2 are generated in phases opposite to each other.
  • the fluctuation width of CS (the difference between the maximum value and the minimum value of the combined cogging torque waveform CS) can be suppressed to a small value.
  • FIG. 6 is a graph showing the waveform of the torque ripple of the motor 10 of the present embodiment. As shown in FIG.
  • an opposite phase can be generated in the torque ripple. That is, since the waveform T1 of the torque ripple generated in the first portion S1 and the waveform T2 of the torque ripple generated in the second portion S2 are generated in phases opposite to each other, they cancel each other out, and a combined torque ripple waveform.
  • the variation width of TS (the difference between the maximum value and the minimum value of the combined torque ripple waveform TS) can be suppressed to a small value. Therefore, according to the present embodiment, the cogging torque can be reduced while suppressing the torque reduction, and the torque ripple can be reduced. Then, vibration and noise generated by the motor 10 can be reduced.
  • the same number of the first portions S1 and the second portions S2 are arranged alternately in the axial direction on the radially outer surface of the rotor core 22. That is, the sum of the number of the first portions S1 and the number of the second portions S2 is an even number, and the first portions S1 and the second portions S2 are alternately arranged in the axial direction.
  • the first portion S1 and the second portion S2 are arranged on the radially outer surface of the rotor core 22 one by one in the axial direction. Therefore, the above-described effects can be obtained with a simple structure.
  • the stator 30 has a stator core 31, an insulator 30Z, and a plurality of coils 30C.
  • Stator core 31 is annular with center axis J as the center.
  • Stator core 31 surrounds rotor 20 radially outside rotor 20.
  • the stator core 31 faces the rotor 20 with a gap in the radial direction. That is, the stator 30 faces the rotor 20 with a gap in the radial direction.
  • the stator core 31 is, for example, a laminated steel sheet formed by laminating a plurality of electromagnetic steel sheets in the axial direction.
  • the stator core 31 has a core back 31a and a plurality of teeth 31b. That is, the stator 30 has the core back 31a and the plurality of teeth 31b.
  • the core back 31a is annular with the center axis as the center.
  • the radially outer surface of the core back 31 a is fixed to the inner peripheral surface of the peripheral wall of the housing 11.
  • the teeth 31b extend radially inward from the radially inner side surface 31c of the core back 31a.
  • the plurality of teeth 31b are arranged on the radially inner side surface 31c of the core back 31a at intervals in the circumferential direction. In the present embodiment, the teeth 31b are arranged at equal intervals in the circumferential direction.
  • the plurality of teeth 31b radially oppose the magnet parts 23 and 24. That is, the radial inner surface of the teeth 31b faces the radial outer surfaces of the magnet portions 23 and 24 from the radial outer side. Compared with the radial gap G1 between the radial outer surface 23a of the first magnet portion 23 and the radial inner surface of the teeth 31b, the radial outer surface 24a of the second magnet portion 24 and the teeth 31b The dimension G2 of the gap in the radial direction between the inner surface and the inner surface in the radial direction is large. Thereby, the above-described effects can be obtained. That is, according to the present embodiment, the cogging torque can be reduced while suppressing the torque reduction, and the torque ripple can be reduced.
  • the insulator 30 ⁇ / b> Z is mounted on the stator core 31.
  • the insulator 30Z has a portion that covers the teeth 31b.
  • the material of the insulator 30Z is, for example, an insulating material such as a resin.
  • the coil 30C is attached to the stator core 31.
  • the plurality of coils 30C are mounted on the stator core 31 via the insulator 30Z.
  • the plurality of coils 30C are configured by winding a conductive wire around each tooth 31b via the insulator 30Z.
  • the electric power steering device 100 is mounted on a steering mechanism of a vehicle wheel.
  • the electric power steering device 100 is a device that reduces the steering force by hydraulic pressure.
  • the electric power steering apparatus 100 includes the motor 10, a steering shaft 114, an oil pump 116, and a control valve 117.
  • the steering shaft 114 transmits an input from the steering 111 to an axle 113 having wheels 112.
  • the oil pump 116 generates a hydraulic pressure in the power cylinder 115 that transmits the driving force of the hydraulic pressure to the axle 113.
  • the control valve 117 controls the oil of the oil pump 116.
  • the motor 10 is mounted as a drive source of the oil pump 116.
  • the electric power steering device 100 according to the present embodiment includes the motor 10 according to the present embodiment. For this reason, the electric power steering device 100 having the same effect as the above-described motor 10 can be obtained.
  • the present invention is not limited to the above-described embodiment, and for example, as described below, a configuration change or the like can be made without departing from the spirit of the present invention.
  • first portion S1 and the second portion S2 are arranged one by one on the radially outer surface of the rotor core 22 in the axial direction, but the invention is not limited to this.
  • At least one first portion S1 and at least one second portion S2 may be arranged on the radially outer surface of the rotor core 22 so as to be three in a row in the axial direction.
  • the effects of the present invention can be obtained even when a total of three first parts S1 and two second parts S2 are arranged in the axial direction.
  • the radially inner surfaces of the magnet portions 23 and 24 are planar in a direction extending in a direction perpendicular to the radial direction.
  • the radial inner surfaces of the magnet portions 23 and 24 may have a concave curve shape. That is, the radial inner surfaces of the magnet portions 23 and 24 may have a curved surface that is depressed radially outward when viewed from the axial direction.
  • the plate-like magnet portions 23 and 24 also include (arc-shaped) magnet portions 23 and 24 extending in an arc shape in the circumferential direction as viewed from the axial direction.
  • the plate-like magnet portions 23 and 24 include shapes other than the bow shape when viewed from the axial direction.
  • the mounting surface portion 22a is not limited to a flat shape extending in a direction perpendicular to the radial direction.
  • the radial inner surfaces of the magnet portions 23 and 24 have a curved surface that is depressed outward in the radial direction when viewed from the axial direction
  • the mounting surface portion 22a is convex outward in the radial direction when viewed from the axial direction. It may be curved.
  • the radial outer surface 23a of the first magnet portion 23 and the radial outer surface 24a of the second magnet portion 24 have the same shape.
  • Each of the radially outer surfaces 23a and 24a has a central portion in the circumferential direction positioned at the outermost side in the radial direction.
  • the present invention is not limited to this, and the portion located on the radially outermost side of the radially outer surfaces 23a, 24a may be a portion other than the circumferential center of the radially outer surfaces 23a, 24a.
  • the portion located on the radially outermost side may be a portion located on one side in the circumferential direction from the central portion in the circumferential direction. May also be a portion located on the other side in the circumferential direction. Also in this case, the function and effect of the present invention can be obtained.
  • the radial position of the portion where the first magnet portion 23 is disposed and the radial position of the portion where the second magnet portion 24 is disposed on the radial outer surface of the rotor core 22. May be different from each other. That is, the radial position of the mounting surface portion 22a where the first magnet portion 23 is disposed is different from the radial position of the mounting surface portion 22a where the second magnet portion 24 is disposed. Specifically, in the radial outer surface of the rotor core 22, the radial position of the portion where the second magnet portion 24 is disposed is larger than the radial position of the portion where the first magnet portion 23 is disposed. It is.
  • the radial thickness of the first magnet part 23 and the radial thickness of the second magnet part 24 are the same. Therefore, the radial position of the radial outer surface 24a of the second magnet portion 24 is radially inner than the radial position of the radial outer surface 23a of the first magnet portion 23. According to this modification, the same operation and effect as in the above-described embodiment can be obtained while using the first magnet part 23 and the second magnet part 24 as common components.
  • any one of the first magnet portion 23 and the second magnet portion 24 is used in the first portion S1 along the axial direction on the radially outer surface of the rotor core 22 in the first portion S1 along the axial direction on the radially outer surface of the rotor core 22.
  • Either one of the first magnet portion 23 and the second magnet portion 24 is arranged in the circumferential direction in the second portion S2 along the axial direction of the radially outer surface of the rotor core 22. May be.
  • a plurality of first magnet units 23 are arranged in the circumferential direction in the first portion S1
  • a plurality of second magnet units 24 are arranged in the circumferential direction in the second portion S2.
  • the plurality of second magnet portions 24 may be arranged in the circumferential direction in the first portion S1, and the plurality of first magnet portions 23 may be arranged in the circumferential direction in the second portion S2. Also in this modified example, since the radial positions of the radial outer surfaces 23a and 24a of the first magnet portion 23 and the second magnet portion 24 arranged in the axial direction are different from each other, the same operation and effect as in the above-described embodiment. Is obtained.
  • the first magnet portion 23 and the second magnet portion 24 arranged in the axial direction are separate members from each other, but the present invention is not limited to this.
  • the first magnet portion 23 and the second magnet portion 24 arranged in the axial direction may be a single member. That is, the first magnet portion 23 of the first portion S1 and the second magnet portion 24 of the second portion S2 arranged in the axial direction are portions of a single member. Further, the second magnet portion 24 of the first portion S1 and the first magnet portion 23 of the second portion S2 arranged in the axial direction are a single member.
  • magnet members extending over the entire length of the mounting surface 22a in the axial direction are respectively provided on the plurality of mounting surfaces 22a on the radially outer surface of the rotor core 22.
  • the second magnet portion 24 is arranged in the second portion S2. That is, in this case, in the magnet member, the first portion S1 corresponds to the first magnet portion 23, and the second portion S2 corresponds to the second magnet portion 24.
  • the first magnet portion 23 is arranged in the second portion S2.
  • the first portion S1 of the magnet member corresponds to the second magnet portion 24, and the second portion S2 corresponds to the first magnet portion 23.
  • the plurality of magnet members are one type of magnet member. According to the present embodiment, the number of components can be reduced, and manufacturing is easy.
  • the motor 10 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.
  • SYMBOLS 10 ... Motor, 20 ... Rotor, 21 ... Shaft, 22 ... Rotor core, 23 ... 1st magnet part (magnet part), 23a, 24a ... Radial outer surface, 24 ... 2nd magnet part (magnet part), 30 ... Stator 31a: core back, 31b: teeth, 31c: radial inner surface, G1, G2: gap size in the radial direction, J: central axis, S1: first part, S2: second part

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Selon un aspect, la présente invention concerne un rotor qui comprend : un arbre ayant un axe central ; un noyau de rotor fixé à l'arbre ; et une pluralité de parties aimant disposées, respectivement, dans la direction circonférentielle et dans la direction axiale sur la surface radialement extérieure du noyau de rotor. La pluralité de parties aimant comprennent chacune : une première partie aimant ; et une seconde partie aimant, dont la position dans la direction radiale sur la surface radialement extérieure du noyau de rotor se situe du côté radialement intérieur par rapport à la position dans la direction radiale de la première partie aimant sur la surface radialement extérieure. La première partie aimant et la seconde partie aimant sont alignées dans la direction axiale.
PCT/JP2019/025426 2018-07-02 2019-06-26 Rotor et moteur Ceased WO2020008979A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201980043694.8A CN112368910B (zh) 2018-07-02 2019-06-26 转子和马达
JP2020528822A JP7363783B2 (ja) 2018-07-02 2019-06-26 ロータおよびモータ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-125891 2018-07-02
JP2018125891 2018-07-02

Publications (1)

Publication Number Publication Date
WO2020008979A1 true WO2020008979A1 (fr) 2020-01-09

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PCT/JP2019/025426 Ceased WO2020008979A1 (fr) 2018-07-02 2019-06-26 Rotor et moteur

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JP (1) JP7363783B2 (fr)
CN (1) CN112368910B (fr)
WO (1) WO2020008979A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021164265A (ja) * 2020-03-31 2021-10-11 日本電産株式会社 モータ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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