Phase-shifted and interleaved angle control for doubly salient electro-magnetic machine

Abstract

Doubly salient electro-magnetic machine using traditional control method has large torque ripple for dead-time during commutation process and its special structure. During commutation, electro-magnetic torque and power will decrease quickly due to all switches are off states. In order to avoid the problem, a novel phase-shifted and interleaved angel control strategy was proposed in this paper. The control algorithm can eliminate dead-time and shape phase current of electric machine to improve output power and reduce torque ripple by adjusting phase-shifted angle and interleaved angle. In this paper, the mathematical model of the machine and working principle of the control strategy were described in detail. Moreover, phase-shifted and interleaved angle optimum method based on low torque ripple and large output power was also given. Finally, a “field-circuit” co-simulation model of motor driving system based on novel control method was built by electro-magnetic finite element analysis and transient solver of control circuit, and simulation results verify theory analysis.