Using D-Q transformation to variable switching frequency PWM control for interior permanent magnet synchronous motor drives

Variable switching frequency PWM (VSFPWM) control has been adopted in the induction motor drive in recent work. Due to the position-related phase inductance, interior permanent magnet synchronous motors (IPMSM) have the difficulty to adopt VSFPWM. In contrast to using thevenin theory from previous work, this paper applies d-q transformation to IPMSM drives to predict the phase-current ripple and applies VSFPWM to control the current ripple of IPMSM. Simulation results validated the effectiveness of the theoretical analysis.