US 12,074,551 B2
Motor control device, electromechanical unit, electric vehicle system, and motor control method
Takafumi Hara, Tokyo (JP); Toshiyuki Ajima, Tokyo (JP); Takaya Tsukagoshi, Tokyo (JP); and Katsuhiro Hoshino, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Appl. No. 17/918,197
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Jan. 22, 2021, PCT No. PCT/JP2021/002147
§ 371(c)(1), (2) Date Oct. 11, 2022,
PCT Pub. No. WO2021/210232, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-073617 (JP), filed on Apr. 16, 2020.
Prior Publication US 2023/0141601 A1, May 11, 2023
Int. Cl. H02P 27/08 (2006.01); B60L 53/20 (2019.01); H02P 23/14 (2006.01)
CPC H02P 27/08 (2013.01) [B60L 53/20 (2019.02); H02P 23/14 (2013.01); B60L 2210/40 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A motor control device connected to a power converter that performs power conversion from direct current power to alternating current power, and configured to control drive of an alternating current motor driven with the alternating current power,
the motor control device comprising:
a current control unit configured to generate a voltage command in accordance with a torque command;
a carrier wave generation unit configured to generate a carrier wave;
a carrier wave frequency adjusting unit configured to adjust a frequency of the carrier wave; and
a gate signal generation unit configured to perform pulse width modulation of the voltage command based on the carrier wave, so as to generate a gate signal to control an operation of the power converter, wherein
the carrier wave frequency adjusting unit adjusts the frequency of the carrier wave, so as to change a phase difference between a phase of the voltage command and a phase of the carrier wave, and
the current control unit corrects an amplitude of the voltage command and the phase of the voltage command based on the phase of the carrier wave, when a modulation rate in accordance with a voltage amplitude ratio between the direct current power and the alternating current power exceeds a predetermined value.