Analysis and experiment of multi-phase induction motor drives for electrical propulsion

In this paper, a new direct torque control (DTC) method of multi-phase induction motor for electrical propulsion is proposed. The classical DTC method for three phase induction motor uses the hysteresis-loop controller based on the switching table, in which the stator flux and torque ripple exists obviously. The new DTC method mentioned above applies the space vector PWM (SVPWM), which can achieve fast torque response with low ripple in the stator flux and torque. This method is applied to five-phase induction motor drives, and then the SVPWM algorithm based on the nearest four vectors of five-phase inverter is studied. Experimental results clearly demonstrate that five-phase induction motor drives for electrical propulsion have a better dynamic and steady state performance.