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Title:
PERMANENT-MAGNET-FIELD DC MOTOR AS WELL AS STATOR THEREFOR AND RARE EARTH ANISOTROPIC BOND MAGNET THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/199271
Kind Code:
A1
Abstract:
The present invention provides a permanent-magnet-field DC motor that increases to a higher output, and reduces the supply current or reduces the spark that occurs between a brush and a commutator, while reducing the usage amount of an expensive rare earth anisotropic magnetic powder. The present invention is a permanent-magnet-field DC motor comprising: a rotor having an armature; a stator (S1) surrounding the rotor, the stator having a permanent magnet as a field magnet source; a commutator linking to a coil of the armature; and a brush in sliding contact with the commutator, the brush supplying DC power to the coil. The stator according to the present invention has a cylindrical yoke (12) having a substantially cylindrical outer circumferential surface, and a cylindrical rare earth anisotropic bond magnet (11) secured to the inner-circumferential-surface side of the yoke. This rare earth anisotropic bond magnet comprises an inner circumferential surface comprising a cylindrical surface, and an outer circumferential surface having a smooth curved surface that bulges outward further in the diameter-increasing direction relative to the boundary between magnetic poles having adjacent centers.

Inventors:
KAYANO Masahiro (1 Wano-wari, Arao-machi, Tokai-sh, Aichi 66, 〒4768666, JP)
HASHIMOTO Yoji (1 Wano-wari, Arao-machi, Tokai-sh, Aichi 66, 〒4768666, JP)
ISHIDA Ren (1 Wano-wari, Arao-machi, Tokai-sh, Aichi 66, 〒4768666, JP)
Application Number:
JP2018/017107
Publication Date:
November 01, 2018
Filing Date:
April 27, 2018
Export Citation:
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Assignee:
AICHI STEEL CORPORATION (1 Wano-wari, Arao-machi Tokai-sh, Aichi 66, 〒4768666, JP)
International Classes:
H02K1/17; H02K15/03; H02K23/40
Foreign References:
JP2010288337A2010-12-24
JPH11103564A1999-04-13
JP2004023915A2004-01-22
JP2013051821A2013-03-14
JPH09224337A1997-08-26
JPS5326908A1978-03-13
Attorney, Agent or Firm:
MORIOKA Masayuki et al. (SANSUI PATENT FIRM, Meieki Forest Bldg. 6F 23-17, Meieki 5-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
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