US 12,267,028 B2
Control apparatus of three-phase AC motor
Satoshi Eguchi, Aichi (JP)
Assigned to OKUMA CORPORATION, Niwa-gun (JP)
Filed by OKUMA Corporation, Aichi (JP)
Filed on May 24, 2023, as Appl. No. 18/323,033.
Claims priority of application No. 2022-089349 (JP), filed on Jun. 1, 2022.
Prior Publication US 2023/0396195 A1, Dec. 7, 2023
Int. Cl. G05B 5/00 (2006.01); H02H 7/08 (2006.01); H02P 1/00 (2006.01); H02P 21/05 (2006.01); H02P 21/22 (2016.01)
CPC H02P 21/05 (2013.01) [H02P 21/22 (2016.02)] 4 Claims
OG exemplary drawing
 
1. A control apparatus of a three-phase AC motor, which detects currents of processing object phases being at least two phases among currents of three phases which flow through a three-phase AC motor,
applies offset compensation processing with respect to current detected values of the processing object phases based on offset compensation amounts obtained in advance, and
controls the three-phase AC motor based on the current detected values of the processing object phases after the offset compensation processing, wherein
the processing of obtaining the offset compensation amounts includes:
processing of obtaining a Fourier coefficient of a frequency component of a torque ripple with respect to a torque command value signal to the three-phase AC motor;
processing of obtaining torque amplitude components of the processing object phases of the three-phase AC motor based on the Fourier coefficient and an electrical angle of the three-phase AC motor at a reference time of the torque command value signal; and
processing of obtaining the offset compensation amounts with respect to the processing object phases based on the torque amplitude components of the processing object phases.