公开(公告)号：US09293974B2

公开(公告)日：2016-03-22

申请号：US14054955

申请日：2013-10-16

Applicant: FANUC CORPORATION

Inventor： Takuya Maeda ,  Reo Arai

IPC: H02K7/04 ,  H02K29/03 ,  H02K1/16

CPC classification number: H02K29/03 ,  H02K1/16 ,  H02K7/04 ,  H02K2201/06 ,  H02K2213/03

Abstract: An electric motor includes a stator having a core back which varies in width in a circumferential direction, and a rotor provided with permanent magnets. In the electric motor, cogging torque is generated M times during one revolution of the rotor, due to the number of magnetic poles of the rotor and the varied shape of the core back. The core back is provided with a step shift by an angle obtained by multiplying (360/M/2) degrees with an odd number. According to one embodiment, the core back may be provided with holes, concave portions or convex portions, so as to provide the core back with the step shift.

Abstract translation: 电动机包括具有在周向上宽度变化的芯背的定子和设置有永磁体的转子。 在电动机中，由于转子的磁极数和芯背的变化形状，在转子的一转期间齿槽转矩产生M次。 芯背设置有通过将（360 / M / 2）度与奇数相乘得到的角度的阶跃移位。 根据一个实施例，芯背可以设置有孔，凹部或凸部，以便使芯返回步进位移。

公开(公告)号：US20140103755A1

公开(公告)日：2014-04-17

申请号：US14054955

申请日：2013-10-16

Applicant: FANUC CORPORATION

Inventor： Takuya Maeda ,  Reo Arai

IPC: H02K7/04

CPC classification number: H02K29/03 ,  H02K1/16 ,  H02K7/04 ,  H02K2201/06 ,  H02K2213/03

Abstract: An electric motor includes a stator having a core back which varies in width in a circumferential direction, and a rotor provided with permanent magnets. In the electric motor, cogging torque is generated M times during one revolution of the rotor, due to the number of magnetic poles of the rotor and the varied shape of the core back. The core back is provided with a step shift by an angle obtained by multiplying (360/M/2) degrees with an odd number. According to one embodiment, the core back may be provided with holes, concave portions or convex portions, so as to provide the core back with the step shift.

Abstract translation: 电动机包括具有在周向上宽度变化的芯背的定子和设置有永磁体的转子。 在电动机中，由于转子的磁极数和芯背的变化形状，在转子的一转期间齿槽转矩产生M次。 芯背设置有通过将（360 / M / 2）度与奇数相乘得到的角度的阶跃移位。 根据一个实施例，芯背可以设置有孔，凹部或凸部，以便使芯返回步进位移。