Vector control of five-phase synchronous reluctance motor with space vector pulse width modulation (SVPWM) for minimum switching losses

Abstract

In this paper, the mathematical model of a five-phase synchronous reluctance (5SynRel) motor is first given. The well known winding function method is employed to derive the winding inductances in order to develop the dynamic equations of 5SynRel machine in a natural frame of reference (a-b-c-d-e). The five-phase transformation from the stationary (a-b-c-d-e) reference frame to a rotating (q-d-Q-D-n) reference frame is developed to remove the angular dependency of the inductances. Later, voltage equations for the 5SynRel machine in synchronous rotating reference frame are developed. Based on the developed voltage equations, the equivalent circuits in the synchronous reference frame are also presented to better understand the operation of the motor drive. The torque in terms of currents is then obtained using the magnetic co-energy method. Rotor field oriented control is then developed for the 5SynRel motor followed by simulation results using Matlab/Simulink. The control block diagram of the proposed vector control is also given in this paper. A five-phase SynRel motor plus a five-phase current regulated space vector PWM (SVPWM) inverter is designed and fabricated in the laboratory. The control method is implemented on a floating-point digital signal processor board, TMS320C32, to verify the validity of the developed control strategy.