A torque ripple reduction method for the aircraft wound-rotor synchronous starter/generator in the starting mode

This paper proposes a torque ripple reduction method for the aircraft wound-rotor synchronous starter/generator in the starting mode. The high-frequency injection method which is commonly used in sensorless control and parameter identification algorithms yields significant torque ripple on the main generator (MG). Since the main exciter (ME) and the MG are mounted on the same shaft, in this paper, the torque of the ME is controlled to compensate the torque ripple of the MG, so that the ripple on the output torque can be reduced. A method which integrates the open-loop control of the field current of the MG into the closed-loop control of the torque of the ME is proposed. The effectiveness of this method is verified by experimental results.