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Motor

A motor and magnet technology, applied in the field of inner rotor type motors, can solve problems such as difficulties, achieve the effect of stabilizing the back electromotive force waveform and suppressing the axial size

Inactive Publication Date: 2015-04-08
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been difficult to laminate a plurality of steel sheets to a cylindrical yoke with a cover like in JP-A-2006-109575

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0054] figure 1 It is a longitudinal sectional view of a motor 1A according to the first embodiment of the present invention. like figure 1 As shown, the motor 1A has a stationary part 2A and a rotating part 3A. The rotating part 3A rotates around the central axis 9A extending up and down.

[0055] The rotating unit 3A has a shaft 31A, a magnet holder 32A, and a plurality of magnets 33A. The shaft 31A is arranged along the central axis 9A. The magnet holder 32A has a cover portion 321A and a cylindrical portion 322A. The cover portion 321A is fixed to the shaft 31A. The cylindrical portion 322A extends downward from the outer peripheral portion of the cover portion 321A. The magnet 33A is fixed to the outer peripheral surface of the magnet holder 32A.

[0056] The stationary part 2A has a case 21A, a stator core 22A, a coil 23A, and a bearing part 27A. The coil 23A is disposed radially outside the magnet 33A. The stator core 22A has a plurality of teeth 222A serving a...

no. 2 Embodiment approach

[0060]

[0061] Next, a second embodiment of the present invention will be described.

[0062] The motor of the present embodiment is installed in home appliances such as air conditioners and refrigerators, and is used as a drive source for fans and pumps. However, the motor of the invention may also be a motor for other known applications. For example, the motor of the present invention may be installed in OA (Office Automation) equipment, medical equipment, automobiles, etc., and generate various driving forces. Hereinafter, the device on which the motor 1 is mounted is referred to as a "drive device".

[0063] figure 2 It is a vertical cross-sectional view of the motor 1 according to this embodiment. like figure 2 As shown, the motor 1 has a stationary part 2 and a rotating part 3 . The stationary part 2 is fixed to the frame of the driving device. The rotating part 3 is rotatably supported with respect to the stationary part 2 .

[0064] The stationary part 2 of t...

no. 3 Embodiment approach

[0110] Next, the third embodiment of the present invention will be described focusing on the differences from the second embodiment. Figure 7 It is a vertical cross-sectional view of a motor 1B according to the third embodiment. Figure 7 The motor 1B differs from the motor 1 of the second embodiment in terms of the configuration of the magnet holder 32B and the presence of the encoder 28B.

[0111] First, the configuration of the magnet holder 32B will be described. Figure 7 The magnet holder 32B has a rotor core 81B and a positioning plate 82B. The rotor core 81B has a cover portion 321B and a cylindrical portion 322B. The cover portion 321B is a substantially disk-shaped portion that expands radially above the bearing portion 27B. The inner peripheral portion of the cover portion 321B is fixed to the outer peripheral surface of the shaft 31B. The cylindrical portion 322B is a substantially cylindrical portion extending downward from the outer peripheral portion of the...

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Abstract

Provided is a motor. A bearing part of the motor is disposed in a radial inner side of a cylinder-shaped magnet holder having a cover, and thereby the axial position of the magnet can overlap with that of the bearing part. The axial size of the motor can be limited. The magnet holder comprises a positioning plate having a plurality of protruding parts protruding from the radial inner side of the magnet to the outer side. The plurality of magnets are disposed at the circumferential position defined by a plurality of protruding parts. Accordingly, circumferential positioning of the magnet can be conducted with high accuracy, and the back electromotive force (EMF) waveform of the motor becomes stable.

Description

technical field [0001] The present invention relates to an inner rotor type motor. Background technique [0002] Conventionally, an inner rotor type motor in which a rotating portion having a magnet is rotated inside a coil has been known. For example, Japanese Patent Laid-Open No. 2006-109575 describes a brushless motor including a rotor and a stator. The rotor has magnets, and the stator is arranged on the outer peripheral side of the rotor. In addition, Japanese Patent Application Laid-Open No. 2009-261191 describes a motor including a stator fixed inside a motor casing and a rotor having a plurality of separated magnets arranged so as to be in contact with the inner surface of the stator core. opposite. [0003] In Japanese Patent Application Laid-Open No. 2006-109575, a magnet is fitted to the outer peripheral surface of the yoke (paragraph 0049). However, if a plurality of magnets are mounted on the outer peripheral surface of the yoke disclosed in JP-A-2006-109575...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/28H02K1/27H02K1/14
CPCH02K1/30H02K1/278H02K21/16H02K7/085
Inventor 北垣宏本田武浦上齐
Owner NIDEC CORP
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