Performance analysis and optimization of digital PWM controllers for surface-mounted PMSM drives

The paper presents performance analysis and optimization of digital pulse width modulation (PWM) techniques for surface-mounted permanent magnet synchronous motors (SPMSM). Three specific PWM techniques such as sinusoidal PWM (SPWM), space vector PWM (SVPWM), and hysteresis PWM (HPWM) are designed and implemented for three-phase voltage source inverter-fed SPMSM drive. Each of the PWM technique is designed and modeled for three-phase inverters. The PWM models are integrated and implemented with the SPMSM drive using the Simulink software. The software is used for simulation tests of the SPMSM drive. The performance of the SPMSM drive using various PWM techniques is investigated for the ramp change in speed and for the step change in load. The power factor (PF) and total harmonic distortion (THD) of the drive are estimated for low and rated speed conditions at no load and rated load conditions. Based on the PF and THD analyses, two optimization algorithms are presented in order to select a PWM for the SPMSM drive with different operating conditions.