FEM simulation and harmonic torque analysis of six-phase BLDC motor

This paper introduces a time stepping finite element analysis (FEA) model coupling circuit-field and movement used in analyzing multi-phase permanent magnet brushless DC (BLDC) motors, presents the element analysis about the coupling problem of control circuit and field, adopts the interpolation moving boundary method to solve rotation problem of the rotor, and employs the above model to analyze the performance of a multi-phase BLDC motor. Simulation and experiment research on the key factors producing the torque - back EMF and current waveform are performed, and the harmonic torques of six-phase BLDC motor are analyzed and deduced. Finally the conclusion is obtained that the sinusoidal harmonic torques can be decreased or removed by reducing the lagging angles of current.