公开(公告)号：US20170288517A1

公开(公告)日：2017-10-05

申请号：US15510462

申请日：2015-09-14

Applicant: MITSUBA Corporation

Inventor： Hirotatsu IKENO ,  Takamasa AOKI ,  Yuya OGAWA

IPC: H02K21/14 ,  H02K1/27 ,  H02K1/16

CPC classification number: H02K21/14 ,  H02K1/146 ,  H02K1/16 ,  H02K1/278 ,  H02K21/16 ,  H02K2201/03 ,  H02K2213/03

Abstract: A brushless motor including a toothed part with a tooth main body and a tip part. Protruding slant parts are formed on both sides of the tooth tip part. A tip surface is formed on the inner diameter of the tip part to face a magnet. A groove part is recessed in the center of the tip surface and extends in the axial direction. A depth d of the groove part satisfies 0 Wg≧Wt/2 (Lx: distance between rotor center and a tooth/slant intersection X; X: intersection between an extension line P of a circumferential side surface of the tooth main body and an extension line Q of a slope of the slant part; Rt: radius of the inner diameter of the tooth tip surface; Wt: width of the tooth main body).