US 11,855,566 B2
Electric motor control apparatus and electric motor control method
Takahiro Mizuguchi, Kanagawa (JP); and Mitsuhiro Shouji, Kanagawa (JP)
Assigned to NISSAN MOTOR CO., LTD., Yokohama (JP)
Appl. No. 17/629,096
Filed by NISSAN MOTOR CO., LTD., Yokohama (JP)
PCT Filed Aug. 28, 2020, PCT No. PCT/JP2020/032780
§ 371(c)(1), (2) Date Jan. 21, 2022,
PCT Pub. No. WO2022/044299, PCT Pub. Date Mar. 3, 2022.
Prior Publication US 2022/0368264 A1, Nov. 17, 2022
Int. Cl. H02P 21/00 (2016.01); H02P 27/08 (2006.01); H02P 21/22 (2016.01)
CPC H02P 27/085 (2013.01) [H02P 21/22 (2016.02)] 6 Claims
OG exemplary drawing
 
1. An electric motor control apparatus, wherein the electric motor control apparatus is configured to:
alternately switch a modulation mode between an asynchronous pulse-width modulation (PWM) control, which controls an electric motor by fixing a PWM frequency, and a synchronous PWM control, which controls the electric motor by making the PWM frequency proportional to a drive frequency of the electric motor;
immediately before switching the modulation mode, obtain a state quantity that correlates with a component in a rotating coordinate system of a voltage applied to the electric motor;
when switching the modulation mode, calculate a compensation value based on the state quantity; and
immediately after switching the modulation mode, compensate for the voltage by the compensation value,
wherein the compensation value includes a voltage norm compensation value and a voltage phase compensation value.