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Rotor and Motor

a rotor and motor technology, applied in the direction of dynamo-electric machines, magnetic circuit rotating parts, dynamo-electric machines, etc., can solve the problems of lowering the rotation performance and unbalance of magnetic forces, and achieve the effect of optimizing the shape of each salient pole and improving rotation performan

Inactive Publication Date: 2010-12-02
ASMO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]It is an object of the present invention to provide a rotor and a motor that optimizes the shape of each salient pole and magnet and improves the rotation performance.

Problems solved by technology

Thus, there is a tendency for a magnetic unbalance to occur in the consequent pole type structure rotor.
This increases torque ripple or the like and thereby lowers the rotation performance.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0049]A first embodiment of the present invention will now be discussed with reference to FIGS. 1 to 3.

[0050]FIGS. 1 and 2 show an inner rotor type brushless motor M. The motor M of the first embodiment uses a rotor 10A including a substantially annular rotor core 12, which is formed from a magnetic metal material and fixed to an outer circumferential surface of a rotation shaft 11, four N-pole magnets 13, which are arranged along the circumferential direction of the rotor core 12, and salient poles 12a, which are formed integrally with the rotor core 12 and arranged between adjacent ones of the magnets 13 in the circumferential direction. The salient poles 12a function as S-poles. In other words, the rotor 10A is a so-called consequent pole type having eight magnetic pole portions. A stator 20 includes a stator core 21, which has twelve teeth 21a, and coils 22, which are wound around the teeth 21a. Slots for accommodating the coils 22 are formed between the teeth 21a that are adjac...

second embodiment

[0067]A second embodiment of the present invention will now be discussed with reference to FIGS. 4 to 8.

[0068]In the second embodiment, the quantity of magnetic pole portions in the rotor differs from the first embodiment. Accordingly, the same reference numerals are given to those components that are the same as the corresponding components of the first embodiment. Such components will not be described in detail.

[0069]As shown in FIGS. 4 and 5, the motor M of the second embodiment uses a rotor 10B includes five N-pole magnets 13, which are arranged along the circumferential direction of the rotor core 12, and five salient poles 12a, arranged between adjacent ones of the magnets 13 in the circumferential direction. The salient poles 12a function as the S-poles. In other words, the rotor 10B is a so-called consequent pole type having ten magnetic pole portions. The stator 20 includes twelve teeth 21a in the same manner as in the first embodiment. That is, the ratio X1:X2 of the magne...

third embodiment

[0092]A third embodiment of the present invention will now be discussed with reference to FIGS. 9 to 11.

[0093]In the third embodiment, the quantity of magnetic pole portions of the rotor differs from the first embodiment. Accordingly, the same reference numerals are given to those components that are the same as the corresponding components of the first embodiment. Such components will not be described in detail.

[0094]As shown in FIGS. 9 and 10, the motor M of the third embodiment uses a rotor 10C including seven N-pole magnets 13, which are arranged along the circumferential direction of the rotor core 12, and seven salient poles 12a, which are arranged between adjacent ones of the magnets 13 in the circumferential direction. The salient poles 12a function as the S-poles. In other words, the rotor 10C is a so-called consequent pole type having fourteen magnetic pole portions. The stator 20 includes twelve teeth 21a in the same manner as the first embodiment. That is, in the brushle...

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Abstract

A motor includes a rotor and a stator. The rotor includes a plurality of magnets, which function as first magnetic poles, and salient poles, which function as second magnetic poles. A ratio X1:X2 of a quantity X1 of magnetic pole portions of the rotor, which is the sum of the quantity of the magnets and the quantity of the salient poles, and the quantity X2 of slots is 2n:3n (n being a natural number). The sum of a magnetic pole occupying angle θ1 of the magnet and a magnetic pole occupying angle θ2 of the salient pole is 360°. The magnetic pole occupying angle θ1 is set in a range of 180°<θ1≦230°.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a rotor having a consequent pole type structure and a motor including such a rotor.[0002]Japanese Laid-Open Patent Publication No. 9-327139 discloses a rotor having the so-called consequent pole type structure as one example of a rotor used in a motor. The rotor described in the publication includes a plurality of magnets, which are arranged in a circumferential direction of a rotor core, and salient poles, which are arranged between the magnets and formed integrally with the rotor core. The plurality of magnets function as one magnetic pole, and the plurality of salient poles function as the other magnetic pole.[0003]The rotor having the consequent pole type structure that is disclosed in the publication includes the magnets, which generate a magnetic flux, and the salient poles, which do not generate a magnetic flux. Thus, there is a tendency for a magnetic unbalance to occur in the consequent pole type structure ro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K21/16
CPCH02K1/2746H02K21/16H02K1/24H02K2213/03H02K29/03
Inventor YAMADA, YOJIYOKOYAMA, SEIYAKATO, SHIGEMASATAKEMOTO, YOSHIAKITATEISHI, YOKO
Owner ASMO CO LTD
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