Analysis of pwm strategies for open-end winding motor drives

Open-end winding machine configurations provide better fault tolerance and flexibility in control compared with a conventional three-phase neutral connected electric motor drives. In this thesis, three pulse width modulation (PWM) schemes namely, sinusoidal PWM, space vector PWM and symmetrical sinusoidal PWM, for open-end winding induction motor drives are derived, analyzed and examined. The three PWM schemes are simulated in MATLAB/Simulink environment; their harmonic spectrums are investigated in both linear range and over modulation range. The PWM schemes are experimentally verified on an open-end winding induction motor model in Simulink environment. Finally, the schemes are discussed based on harmonic content, switching losses, steady state performances on open-end winding induction motor and ease of implementation.