| Abstract |
A more realistic simulation of a PWM driven DC motor switching at different frequencies is performed, and the corresponding switching current spikes, inductive current ripples, rms power delivered to the motor, and harmonic power loss are calculated. The optimal chopping frequency can then be selected based on the above results with the criteria of minimum current spikes, minimum current ripples, minimum harmonic power loss and maximum rms power delivered to the motor. It is found that the faster the rise and fall times of the PWM, the higher the switching current spikes and this determines the highest switching frequency. A more realistic model of the DC motor with high frequency effects is used [1] in the simulation. The equivalent circuit of the armature winding is obtained by the curve fitting method using the software package MATLAB. The software used for simulation is PSPICE which is a circuit simulation tool. |
