公开(公告)号：US20210218299A1

公开(公告)日：2021-07-15

申请号：US16967379

申请日：2019-03-26

Applicant: DENSO CORPORATION

Inventor： Koji MIKAMI ,  Akihiro UTSUMI ,  Yoshiaki TAKEMOTO ,  Koji HOTTA

IPC: H02K1/27 ,  H02K21/16

Abstract: A motor includes a rotation shaft, a rotor, and a stator. The rotor includes a rotor core and magnetic pole portions respectively including permanent magnets embedded in the rotor core. The magnetic pole portions have polarities that differ alternately in a circumferential direction. A projection projecting radially outward from an outer circumferential portion of the rotor core is arranged between the magnetic pole portions having different polarities. In a radial opposing relationship of the rotor core and the teeth taken at different times while the rotor is revolved once, at a certain time, a quantity of the teeth that oppose one of the magnetic pole portions and do not oppose the projection is greater than a quantity of the teeth that simultaneously oppose two of the magnetic pole portions adjacent to each other in the circumferential direction and the projection located in between the magnetic pole portions.

公开(公告)号：US20200244195A1

公开(公告)日：2020-07-30

申请号：US16610564

申请日：2018-06-07

Applicant: DENSO CORPORATION

Inventor： Kazunori SHIMADA ,  Toshihiro UCHIDA ,  Yoshiaki TAKEMOTO

IPC: H02P6/10 ,  H02P23/04

Abstract: A motor control device controls a two-phase motor. The two-phase motor obtains a combined torque, which serves as an output torque. The A-phase and B-phase motor portions being joined having a phase difference in terms of structure. The motor control device sets each of A-phase and B-phase drive currents supplied to the A-phase and B-phase motor portions to control the two-phase motor. The motor control device includes a fundamental wave setting unit that sets a sinusoidal fundamental wave current of the A-phase and B-phase drive currents, and a superimposing wave setting unit that sets a high-order harmonic current superimposed on the fundamental wave current. The superimposing wave setting unit sets the high-order harmonic current of at least one of “4n+1”th-order and “4n−1”th-order to reduce a component of “4n”th-order in torque pulsation of the combined torque, and “n” is a natural number.