Modeling and simulation of brushless permanent magnet DC motor in dynamic conditions by time stepping technique

A method of modeling and simulation of a brushless permanent magnet DC motor using time stepping finite element method is presented. In the proposed model, the electromagnetic field equations, the stator circuit equation and the motion equation are solved simultaneously at each time step; thus the eddy current effect, the saturation, rotor movement and the nonsinusoidal quantities can all be taken into account directly in the system of equations. Dynamic conditions of the motor at starting, step voltage variation and load torque changes are investigated by using the proposed dynamic model.