Study on Optimal Current Allocation Strategy for Doubly Salient Electromagnetic Machine based on Particle Swarm Optimization

The magnetic field of doubly salient electromagnetic machine (DSEM) can be controlled by the field current, and it can be used in flux-weakening control of motor and voltage control of generator [1]. However, due to the existence of field windings, the efficiency of DSEM is lower. And the efficiency optimization control is needed. The research focuses on two aspects: based on loss model and on-line searching technology [2], [3]. Based on asymmetric current control, this paper builds the loss model of a four-phase DSEM, defines the torque constraint and improves efficiency by particle swarm optimization (PSO). In the end, validity is confirmed by simulation and experiment.