Modulation method to restrain commutation torque ripple of high speed momentum wheel

WU Qidong, ZHANG Xiang, LIAO Wenhe

（School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China）

Abstract: Aiming at the problem that the torque fluctuation was increased and the average torque was decreased during the commutation of the momentum wheel, the cause of the torque ripple during the commutation of the high speed momentum wheel was studied and the phase current changed during the commutation process of the momentum wheel was analyzed. A new commutation method based on current PWM modulation was proposed, and the lead commutation angle was deduced. The driving control model was established by Saber and Simulink cosimulation platform, and the torque during commutation of momentum wheel was tested. The results show that the control of the duty cycle in the current modulation period can effectively restrain the torque ripple generates during commutation of the momentum wheel at high speed and make the output torque more stable.

Key words: momentum wheel; torque ripple; current control; PWM modulation