公开(公告)号：US11316403B2

公开(公告)日：2022-04-26

申请号：US16324135

申请日：2017-07-13

Applicant: DENSO CORPORATION

Inventor： Masao Tokunaga ,  Masanori Yasuda ,  Koji Ito

IPC: H02K7/09 ,  F16C32/04 ,  H02K11/215

Abstract: An electric motor system includes a rotary shaft having an axis line displaceable relative to a rotation center, a magnetic bearing for supporting the rotary shaft, a permanent magnet mounted on the rotary shaft and having a plurality of magnetic poles arranged in a circumferential direction around the axis line of the rotary shaft, three detection elements arranged in the circumferential direction around the rotation center for detecting a magnetic flux generated from the permanent magnet, and a coordinate detection section for determining coordinates of the axis line of the rotary shaft based on output values of two detection elements selected out of the three detection elements in accordance with a rotation angle of the rotary shaft.

公开(公告)号：US10958133B2

公开(公告)日：2021-03-23

申请号：US15523269

申请日：2015-10-29

Applicant: DENSO CORPORATION ,  SOKEN, INC. ,  National University Corporation Shizuoka University

Inventor： Koji Ito ,  Masanori Yasuda ,  Shinji Makita ,  Jun Yamaoka ,  Masao Tokunaga ,  Etsuro Yoshino ,  Junichi Asama

IPC: H02K7/09 ,  H02P1/00 ,  H02K11/20 ,  F16C39/06 ,  F16C32/04 ,  H02P6/16 ,  H02K11/21 ,  H02K21/22 ,  H02K5/16 ,  F16C19/06 ,  H02K29/06

Abstract: In an electric motor, a magnetic bearing generates an electromagnetic force between multiple permanent magnets and a coil and rotatably supports an other side of a rotation shaft in an axis line direction. The rotation shaft is configured to be capable of being inclined with a rotation center line using a bearing side of the rotation shaft as a fulcrum. An electronic control device controls a current that flows to the coil such that an axis line of the rotation shaft approaches the rotation center line due to a supporting force which is the electromagnetic force between the multiple permanent magnets and the coil. Accordingly, the rotation shaft is rotatably supported to be freely rotatable by a magnetic bearing and the bearing.