A DSP-based vector control of five-phase synchronous reluctance motor

Abstract

In this paper, the mathematical model of a five-phase synchronous reluctance motor (SynRel) is given. The well known winding function method is used to derive the winding inductances in order to develop the dynamic equations of SynRel in yhe 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 (d-q-D-Q-n) reference frame is developed to remove the angular dependency of the inductances. Later, voltage equations for the five-phase SynRel 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. Indirect rotor flux field-oriented control is then developed for the five-phase SynRel motor followed by simulation results using Matlab/Simulink The control block diagram of the proposed indirect vector control is also given in this paper. A five-phase SynRel motor plus a five phase current regulated space vector PWM (SVPWM) inverter are designed and fabricated in the laboratory. The control method is implemented using the floating-point digital signal processor board TMS320C32 to verify the validity of the developed control strategy.