MOTOR AND METHOD OF MANUFACTURING MOTOR

WIPO Patent Application WO/2013/042341

A1

A stationary portion of a motor includes a stator core, insulators, and coils. The stator core includes a core back bent into an annular shape, and a plurality of teeth arranged to extend radially inward from the core back. A radially inner end portion of each tooth is arranged to have a circumferential width substantially equal to or smaller than a circumferential width of a remaining portion of the tooth. The core back includes, between adjacent ones of the teeth, a protruding portion arranged to protrude radially inward, a cut arranged to extend radially outward from the protruding portion, and a through hole arranged to extend in an axial direction through the core back, and defined at a radially outer end portion of the cut. The protruding portion is arranged to locally increase a radial dimension of the core back. A reduction in magnetic reluctance of the core back is thereby achieved in the vicinity of the cut.

UCHITANI YOSHIHIRO (JP)
TANAKA YUJI (JP)
YOKOGAWA TOMOYOSHI (JP)

PCT/JP2012/005879

March 28, 2013

September 14, 2012

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NIDEC CORP (JP)
UCHITANI YOSHIHIRO (JP)
TANAKA YUJI (JP)
YOKOGAWA TOMOYOSHI (JP)

H02K1/18

JPH11299134A	1999-10-29
JPH03159531A	1991-07-09
JP2010193715A	2010-09-02
JPS5674939U	1981-06-19
JP2008306816A	2008-12-18
JP2000014057A	2000-01-14
JP2009136091A	2009-06-18

KITAMURA, Hideaki (338 Kuzetonoshiro-cho, Minami-ku, Kyoto-sh, Kyoto 05, JP)

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