Title:
永久磁石内蔵型回転モータの極弧率の決定方法及び永久磁石内蔵型回転モータ
Document Type and Number:
Japanese Patent JP3638944
Kind Code:
B1
Abstract:
There is provided an interior permanent magnet rotary motor that can reduce cogging torque and can also reduce the amount of permanent magnet used, without reducing torque. In an interior permanent magnet rotary motor having N slots (306) and P permanent magnet magnetic poles (311), in which P/N is set in the range of 2/3 to 43/45 and Po in a irreducible fraction Po/No of the P/N is set to be an odd number, an pole arc ratio È p is defined to be the ratio of ¸pp/¸p where the angle between two line segments assumed for a pair of flux barriers (321), each of which connects the center of a rotor core (309) and one of the corners of a flux barrier that is closest to the surface of the rotor core (309) is indicated by ¸pp and the angle obtained by dividing the full circumference angle (360°) of the rotor core by the number of the permanent magnet poles is indicated by ¸p.
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Inventors:
Toshihito Miyashita
Satoru Onodera
Satoru Onodera
Application Number:
JP2004194149A
Publication Date:
April 13, 2005
Filing Date:
June 30, 2004
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
H02K1/27; H02K21/14; H02K29/03; H02K1/22; (IPC1-7): H02K1/27; H02K1/22; H02K21/14
Domestic Patent References:
| JP11299199A | ||||
| JP2000253633A |
Attorney, Agent or Firm:
西浦 ▲嗣▼晴