COMPARATIVE EVALUATION OF ASYMMETRIC HALF BRIDGE DRIVE MODES FOR SRM

This paper discusses the mathematical model, constructional aspects, functional aspects, simulation parameters of switched reluctance motor along with its simulation. Constructional aspects include stroke angle, step angle, inductors overlap ratio and inductance versus rotor position at different angles. Functional aspects deal with mathematical expression of Switched Reluctance Motor including torque generation, calculation of flux linkage and other parameters like saturation current, base speed, electrical and mechanical motion are also discussed. These parameters are well tabulated for simulation. Once the constructional and functional parameters are defined then simulation is carried out. In this part model is tested with asymmetric half bridge converter model as power drive, three modes of operation based on applied voltage method, single pulse, soft chopping along with hard chopping are simulated at different speeds and results are demonstrated. Torque and current relationship is observed to find out which mode is suitable for smooth torque operation and have better speed control.