The Analysis of the Influences of Switching Opportunity for a Novel 6/8 Pole Changing Line-Start Permanent Magnet Synchronous Motor

This paper presents a novel 6/8 pole changing line-start permanent magnet synchronous motor (LSPMSM) which can decrease braking torque and pulsating torque fundamentally and improve starting capability effectively. The impedance parameters of 6-pole winding and 8-pole winding are calculated in use of two-dimensional (2D) finite element analysis (FEA). Then the bipolar dynamic simulation model is built based on MATLAB/Simulink. And finally, in use of the simulation model, the influences of switching speeds and phase differences between induced electromotive force of 8-pole winding and applied voltage (Delta theta) on impulse currents and synchronization when switching are analyzed, and the results show that the impulse currents are related to Delta theta and the synchronization is related to both Delta theta and switching speeds.