PROJECT TITLE :

Novel PWM Schemes With Multi SVPWM of Sensorless IPMSM Drives for Reducing Current Ripple

ABSTRACT:

This paper proposes novel pulsewidth modulation (PWM) schemes for multi-house-vector pulsewidth modulation (MSVPWM), that is utilized in position sensorless management of interior permanent-magnet synchronous motor drives. The estimation of the rotor position relies on magnetic saliency and employs high-frequency elements of voltage and current, that are excited by MSVPWM. The distinction between the instantaneously applied voltage vector and the reference voltage vector causes current ripple. Since six or four voltage vectors are generated throughout a PWM period, the sequences of the error voltage vectors cause totally different types of current ripples. In this paper, the proposed MSVPWM schemes use six sequences for zero-/low-speed operation and 24 sequences for top-speed operation to scale back line current ripple. Experimental results confirm that the proposed MSVPWM schemes cause vital reduction in harmonic current while maintaining high performance of sensorless estimation.