A novel technique for eliminating switching transients of variable reluctance drive inverter / Mohd. Shahrunnizam Sampul

This thesis describes a new method for eliminating switching transients of variable reluctance drive inverter [7]. In standard VR converter, rapid current commutation is achieved by forcing the motor phase current against the supply voltage via a pair of diodes. Hence the commutation diodes tend to chop the phase current and as a consequence a small amount of residue energy remains in the phase winding. The experimentally observed high frequency transient immediately after current chopping is mainly due to this residue energy. The proposed technique is based on modifying the basic half-bridge inverter circuit by adding a suitably sized resistor in parallel with the load to provide a path for the residue energy to dissipate smoothly. This project includes the experimental and simulation results, the parameters that affect this type of transient and proposes procedures for designing such transient eliminating circuit.