PERMANENT-MAGNET-FIELD DC MOTOR AS WELL AS STATOR THEREFOR AND RARE EARTH ANISOTROPIC BOND MAGNET THEREFOR

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 (JP)
HASHIMOTO YOJI (JP)
ISHIDA REN (JP)

Application Number:

PCT/JP2018/017107

Publication Date:

November 01, 2018

Filing Date:

April 27, 2018

Export Citation:

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Assignee:

AICHI STEEL CORP (JP)

International Classes:

H02K1/17; H02K15/03; H02K23/40

Foreign References:

JP2010288337A	2010-12-24
JPH11103564A	1999-04-13
JP2004023915A	2004-01-22
JP2013051821A	2013-03-14
JPH09224337A	1997-08-26
JPS5326908A	1978-03-13