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Comparative Study of SPWM and SVPWM Based Closed Loop Speed Control of PMSM

Sudesh Nain

The PMSM motors have been increasingly applied in drive applications due to its simple structure and efficiency. With advances in solid-state power electronic devices and microprocessors, various inverter control techniques employing pulse width modulation (PWM) techniques are becoming increasingly popular in AC motor drive application. These PWM-based drives are used to control both the frequency and the magnitude of the voltage applied to motors. Various PWM techniques have been developed in past two decades. This paper analysis the closed loop speed control of a PMSM with the two PWM techniques namely, sinusoidal PWM and Space vector PWM. Both the control scheme is simulated in the Matlab/Simulink software environment. The simulation result shows that the speed control of PMSM with SVPWM is better than with SPWM technique. It also shows that the whole control system has less harmonic distortion and lower switching losses.