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公开(公告)号:US09893575B2
公开(公告)日:2018-02-13
申请号:US14778575
申请日:2014-03-20
Inventor: Kiyomi Kawamura , Hiroaki Kawasaki , Yuichi Yoshikawa , Yasushi Kato , Haruhiko Kado , Noritaka Aso
CPC classification number: H02K1/2706 , H02K1/02 , H02K1/14 , H02K1/16 , H02K1/276 , H02K3/12 , H02K15/03 , H02K2213/03
Abstract: A permanent-magnet-embedded electric motor includes a stator having a coil wound on a stator core, and a rotor disposed rotatably inside the stator through a gap to an inner circumferential surface of the stator core. The rotor is provided with a rotor core formed of laminated steel plates having a plurality of magnet-embedding holes, and a permanent magnet housed and retained in each of the magnet-embedding holes. A thickness of the bridge portions formed between edges of the magnet-embedding holes and an outer circumference of the rotor core, and a thickness of a thinned link portion connecting adjoining two of the bridge portions are thinner than a thickness of the steel plates.
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公开(公告)号:US10348141B2
公开(公告)日:2019-07-09
申请号:US15266587
申请日:2016-09-15
Inventor: Hu Li , Yuichi Yoshikawa , Hiroshi Murakami , Haruhiko Kado , Kiyomi Kawamura
Abstract: A motor of this invention comprises a rotor having a permanent magnet, the number of which magnet poles is P, and a stator including M pcs of teeth, the teeth arranged in a circumferential direction in a manner to face the permanent magnet through a spatial gap, wherein the stator includes stator core having the number M of the teeth, and a winding wire wound about each of the tooth, wherein the number P of the magnet poles and the number M of the teeth have a relation defined by formulae (2/3)M
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