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CN-113904471-B - Rotor, motor, and method for manufacturing rotor

CN113904471BCN 113904471 BCN113904471 BCN 113904471BCN-113904471-B

Abstract

Provided are a rotor, a motor, and a method for manufacturing the rotor, wherein the rotor has stable magnetic properties. The rotor according to the embodiment rotates around a rotation axis. The rotor is arranged on the motor. The rotor is opposed to the stator. The rotor has a plurality of main magnets, a plurality of auxiliary magnets, and a holding portion. The plurality of main magnets are magnetically oriented in a radial direction. The plurality of main magnets are arranged in the circumferential direction. The plurality of auxiliary magnets are magnetically oriented in a circumferential direction. The plurality of auxiliary magnets are arranged between the main magnets. The holding portion is formed of a resin material, and embeds the main magnet and the auxiliary magnet. The 1 st exposed surface is provided on the surface of the main magnet. The 1 st exposure surface is exposed from the holding portion.

Inventors

  • JI YONGXIAN
  • SHI XIAN

Assignees

  • 东芝生活电器株式会社

Dates

Publication Date
20260505
Application Date
20210426
Priority Date
20200622

Claims (9)

  1. 1. A rotor provided in a motor, facing a stator and rotating around a rotation axis, is provided with: a plurality of main magnets magnetically oriented in a radial direction and arranged in a circumferential direction; A plurality of auxiliary magnets magnetically oriented in the circumferential direction and arranged between the main magnets, and A holding part formed of a resin material and embedding the main magnet and the auxiliary magnet, The 1 st exposed surface exposed from the holding portion is provided on the surface of the main magnet, The auxiliary magnet is located at a position opposite to the 1 st exposed surface of the stator, The surface of the auxiliary magnet is provided with a2 nd exposure surface exposed from the holding part, The 2 nd exposure surface is provided locally on the auxiliary magnet, A pair of 3 rd exposed surfaces facing both sides in the circumferential direction are provided on the surface of the main magnet, The 4 th exposed surface is provided on the surface of the auxiliary magnet, The holding portion is provided with a recess portion, The 3 rd exposed surface and the 4 th exposed surface are exposed in the recess.
  2. 2. The rotor according to claim 1, wherein, The 1 st exposed surface faces in the radial direction.
  3. 3. The rotor according to claim 1 or 2, wherein, The main magnet has a1 st opposing surface opposing the stator, The 1 st exposed surface is located on the 1 st opposed surface.
  4. 4. The rotor according to claim 3, wherein, The holding portion is provided with a gate mark, The gate mark is disposed so as to be offset from the center of the holding portion in the radial direction toward the opposite side of the stator.
  5. 5. The rotor according to claim 3, wherein, The 1 st opposing surface is provided with embedded surfaces for embedding the holding portion on both sides of the 1 st exposed surface in the circumferential direction.
  6. 6. The rotor according to claim 3, wherein, The 1 st exposed surface is provided over the entire axial length of the main magnet.
  7. 7. The rotor according to claim 1, wherein, The auxiliary magnet has a2 nd facing surface facing the stator, The 2 nd exposure surface is provided only on a part of the 2 nd facing surface.
  8. 8. The rotor according to claim 1, wherein, The auxiliary magnets have exposed surfaces on the surfaces facing both sides in the radial direction.
  9. 9. A motor is provided with: the rotor according to claim 1 to 8, and The stator.

Description

Rotor, motor, and method for manufacturing rotor Technical Field Embodiments of the present invention relate to a rotor, a motor, and a method of manufacturing a rotor. Background A motor is known in which the drive torque is increased by arranging magnets of a rotor in a halbach array. In such a rotor, the positional accuracy of the magnet greatly affects the magnetic characteristics of the rotor. However, the conventional technique has a problem that it is difficult to improve the positional accuracy of the magnet and to stabilize the magnetic characteristics of the rotor. Patent document 1 International publication No. 2013/008284 Disclosure of Invention The invention provides a rotor with stable magnetic characteristics, a motor and a method for manufacturing the rotor. The rotor according to the embodiment rotates around a rotation axis. The rotor is arranged on the motor. The rotor is opposed to the stator. The rotor has a plurality of main magnets, a plurality of auxiliary magnets, and a holding portion. The plurality of main magnets are magnetically oriented in a radial direction. The plurality of main magnets are arranged in the circumferential direction. The plurality of auxiliary magnets are magnetically oriented in a circumferential direction. The plurality of auxiliary magnets are arranged between the main magnets. The holding portion is formed of a resin material, and embeds the main magnet and the auxiliary magnet. The 1 st exposed surface is provided on the surface of the main magnet. The 1 st exposure surface is exposed from the holding portion. Effects of the invention The motor magnet material can be set at a predetermined position. Drawings Fig. 1 is a sectional view of a washing machine having a motor of one embodiment. Fig. 2 is a cross-sectional perspective view of a rotor and a stator of one embodiment. Fig. 3 is a schematic partial sectional view of a peripheral wall portion of a rotor according to an embodiment. Fig. 4 is a schematic view of a rotor of an embodiment as viewed from the stator side. Fig. 5 is a schematic partial sectional view of a mold for molding a holding portion of a rotor according to an embodiment. Fig. 6 is a schematic diagram illustrating a homopolar excitation process according to an embodiment. Fig. 7 is a schematic diagram illustrating a heteropolar excitation process according to an embodiment. Description of the reference numerals The mold, 10g, gate, 16, motor, 20, rotor, 30, stator, 70, holding part, 70g, gate trace, 74, 2 nd recess (concave), 80, main magnet, 80A, 1 st magnetic member, 81, 1 st opposite face, 86, 1 st exposed face, 87, 1 st embedded face (embedded face), 88, 3 rd exposed face, 90, auxiliary magnet, 90A, 2 nd magnetic member, 91, 2 nd opposite face, 96, 2 nd exposed face, 98, 4 th exposed face, c, circumferential direction, o, rotation axis, r Detailed Description Hereinafter, a rotor, a motor, and a method of manufacturing the rotor according to the embodiments will be described with reference to the drawings. In the following description, the same reference numerals are given to structures having the same or similar functions. Further, a repetitive description of these structures may be omitted. Fig. 1 is a sectional view of a washing machine having a motor of the present embodiment. In the following description, a vertical lower side, which is a side of the installation surface of the washing machine, is referred to as a lower side of the washing machine, and a vertical upper side, which is an opposite side of the installation surface, is referred to as an upper side of the washing machine. The left and right sides are defined with reference to a direction in which the washing machine is viewed from a user standing on the front side of the washing machine. The side closer to the user standing on the front of the washing machine as viewed from the washing machine is defined as "front", and the side farther therefrom is defined as "rear". In the present specification, "lateral direction" means a left-right direction in the above definition. In the present specification, the "depth direction" means the front-rear direction in the above definition. In the figure, +X direction is right direction, -X direction is left direction, +Y direction is back direction, -Y direction is front direction, +Z direction is up direction, -Z direction is down direction. Fig. 1 is a sectional view of a washing machine 1 perpendicular to a front-rear direction. The washing machine 1 includes, for example, a casing 11, a top cover 12, a water tub 13, a rotary tub 14, a pulsator 15, and a motor 16. The washing machine 1 is a so-called vertical axis type washing machine in which the rotation axis O of the spin basket 14 is oriented in the vertical direction. The washing machine 1 is not limited to the vertical axis type, and may be a so-called drum type washing machine in which the rotation axis of the rotary tub is inclined downward in the horizontal directio