Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Torque Ripple Reduction Algorithm of PM Synchronous Motor at High Speed Operation
Authors Jong-Hyun Kim ; Kwan-Yuhl Cho ; Hag-Wone Kim
DOI 10.6113/TKPE/2015.20.5.429
Page pp.429-436
ISSN 1229-2214
Keywords Torque ripple compensation; Back emf harmonics; PMSM; Voltage compensation
Abstract Torque ripples generate mechanical vibration at low speed and acoustic noise at high speed. The back emf harmonics of a PM synchronous motor is one of the main sources of torque ripples. To reduce torque ripples resulting from back emf harmonics, dq-axis harmonic currents that reduce the torque ripples are generally compensated to the current controller. Harmonic current compensation is effective at low speed, but it is not applicable at high speed because of the limited bandwidth of the current controller. In this study, dq-axis harmonic voltage compensation that can reduce torque ripples at high speed is proposed. The dq-axis harmonic voltages are calculated from the motor speed and the dq-axis harmonic currents. The effectiveness of the proposed method in reducing torque ripple is verified by a simulation and experiments.