Multi-dimension SVPWM-based sensorless control of 7-phase PMSM drives

Abstract

A new control technique for the 7-phase permanent magnet synchronous machine (PMSM) when a failure in the speed sensor is introduced. This will make the whole drive system more robust and at the same time reduce the cost. The speed and the position of the shaft of the motor are obtained by tracking the saturation saliency of the 7-phase motor when a failure in speed sensor is occurred. The proposed saliency-tracking algorithm is based on measuring the derivative of the stator currents of the 7-phase motor after the switching of the insulated gate bipolar transistor (IGBT) of the 7-phase inverter due to the implementation of the multi-dimension space vector pulse width modulation (SVPWM). This modulation technique is used in the 7-phase drives to suppress the 3rd and 5th harmonics. Simulation results show that the 7-phase motor drive could track the reference speed at different load conditions when a failure in the speed sensor is occurred without compromising the performance.

A novel 7-level reduced-switch MLI topology fed PMSM drive for electric vehicle system

“…To establish the major objective, the novel RSMLI topology for the PMSM drive-fed EV system has been proposed with reduced switching devices and dis-integration of high-frequency isolated transformers [23], [24]. Most of the MLI topologies are controlled by pulse-width modulation (PWM) control methods, and some regular PWM methods are sinusoidal phase-shift PWM (SPSPWM) and level-shift PWM (SLSPWM) control methods [25] [30]. But, it involves more carrier signals and complex drive circuitry for designing switching patterns to generate required output voltage levels [31] [38].…”