Volume -I , Issue -III, February 2014

MODELING AND DETERMINATION OF OPTIMALS WITCHING ANGLES FOR SWITCHED RELUCTANCE MOTOR DRIVESv

Karthik. V and V. V. Narsimha Murthy

We present a lookup table based model for switched reluctance motors (SRMs). The model uses four coefficients, which are rotor position dependent and calculated from the flux-current-angle data using curve fitting. The four coefficients are further represented with sixth degree polynomials, which can be calculated effectively with Qin Jiushao's method. Simulated results show that the magnetic characteristics calculated with our model agree well with the original flux-current angle data. Also a method is proposed to produce optimal switching angles, based on a non-linear inductance model of low inductance region for switched reluctance motor (SRM). The optimal turn-on angle is derived from the non-linear model and electrical equation of SRM while optimal turn-off angle is derived from the turn-on angle. The proposed method has more accuracy than the conventional analytical method and improves the efficiency of the drive. Simulation results demonstrate the validity and effectiveness of the proposed method.

Modeling and determination, Motor Drives, switched reluctance motors

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