Title:
モータ
Document Type and Number:
Japanese Patent JP5888490
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a structure capable of reducing a cogging torque by arranging ferrite magnets radially.SOLUTION: A rotation part 3A of a motor 1A has a core rotor having a plurality of core pieces 51A, and a plurality of magnets 52A. The plurality of core pieces 51A and the plurality of magnets 52A are arrayed alternately in a peripheral direction. A radially outer surface of a core piece 51A has a small-diameter surface 512A and a large-diameter surface 511A larger in distance from a center axis than the small-diameter surface. When such a configuration is employed, a motor having small cogging torque is obtained only by suitably setting extent and arrangement of the large-diameter surface 511A. Further, the large-diameter surface 511A is arcuate having its center at the center axis on a section orthogonal to the center axis. Consequently, the whole large-diameter surface can be put close to teeth 412A, and magnetic flux density between the teeth 412A and the large-diameter surface 511A can be increased.
More Like This:
Inventors:
Toshinobu Shinohara
Yoshihiro Uchiya
Yoshihiro Uchiya
Application Number:
JP2011246975A
Publication Date:
March 22, 2016
Filing Date:
November 10, 2011
Export Citation:
Assignee:
Nidec Corporation
International Classes:
H02K1/27; H02K1/22; H02K1/28; H02K21/16
Domestic Patent References:
| JP2001211582A | ||||
| JP2010213457A | ||||
| JP2001204146A | ||||
| JP7312852A | ||||
| JP51050408A | ||||
| JP2006522578A |
Foreign References:
| US20110254399 | ||||
| US5063318 | ||||
| US20030062792 |
Attorney, Agent or Firm:
Takami Nishida