A method of modeling and numerical simulation of a brushless permanent-magnet dc motor using time-stepping finite-element technique 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 effect, the 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 using the proposed dynamic model. Index Terms-Brushless permanent-magnet dc (BLDC) motor, dynamic analysis, time-stepping finite-element method (FEM).

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An analysis of the starting process of the disk drive spindle motor using the time stepping finite element method (FEM) is presented. The electromagnetic field is coupled with the stator circuit and motion equations and solved simultaneously at each time step. The model also includes control elements. By coupling the control loop features with the time stepping FEM model, the stator winding can be fed with the actual output voltages from the inverter, as in an actual system. The saturation effects, the eddy current effects, the harmonic effects, and the control nonlinearities are all taken into account in the system of equations. Torque, speed, and current with different set limits in the starting regime are investigated in this paper.Index Terms-Disk drive spindle motor, starting process, time stepping finite element method.

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