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Self-Optimizing Control of Commutation Angle for DSEM Based on Three-phase Nine-state Control

The current closed loop of three-phase nine-state control is an effective method to suppress torque ripple of doubly salient electromagnetic motor. In this paper, the commutation process in “three-phase nine-state” conduction mode is analyzed in detail, and the influence of different commutation angles on torque ripple is compared. On this basis, a self-optimizing control of commutation angle for DSEM is proposed, in which the initial commutation angle is set first. Then, according to the feedback of each phase current, the angle is continuously adjusted by iterative control, so that at the end of commutation, the current of conduction phase just reaches the reference current value, and the optimal commutation angle is reached at this time to reduce torque ripple. Finally, the experiment was carried out based on 18/12-pole DSEM, and the experimental results verify the effectiveness of the method. With no requirement for system parameters, this method can obtain the commutation angle required to suppress the torque ripple under different working conditions online.