公开(公告)号：US20230223824A1

公开(公告)日：2023-07-13

申请号：US18009894

申请日：2021-03-01

Applicant: Hitachi, Ltd.

Inventor： Takafumi HARA ,  Makoto ITO ,  Akeshi TAKAHASHI ,  Toshiyuki AJIMA

IPC: H02K11/33 ,  H02K7/116 ,  H02M7/48 ,  H02P21/06 ,  H02P27/08

CPC classification number: H02K11/33 ,  H02K7/116 ,  H02M7/48 ,  H02P21/06 ,  H02P27/08

Abstract: A motor control device of the present invention is connected to a power converter for converting power from direct current power to alternating current power, and controls the drive of an alternating current motor that is driven using said alternating current power, and the motor control device is provided with: a carrier wave generator; a carrier wave frequency adjuster that adjusts the frequency of the carrier wave; and a gate signal generator that uses the carrier wave to pulse width modulate a voltage command according to a torque command, and generates a gate signal for controlling operation of the power converter, wherein the carrier wave frequency adjuster adjusts the voltage command and carrier wave phase difference to reduce eddy current loss generated in rotor magnets of the alternating current motor according to a d-axis current flowing to the alternating current motor and the rotational speed of the alternating current motor.