Abstract
This paper proposes novel switched reluctance (SR) inverter for four-phase SR drive which generates high output torque without compromise in efficiency for medium and high speed operations. In proposed SR inverter drive, the recovered energy of phase windings circulates with help of two boost capacitors. The circulation of energy between two alternate working phase winding provides charging of boost capacitors without phase current overlapping. The de-energization of phase windings makes either of boost capacitor and dc-bus voltage in series. Thus, the phase windings are de-energized with twice negative dc-bus voltage during entire process until SR drive working under absolute torque region. The de-energizing current reduces to zero at faster rate, and therefore proposed SR inverter drive operates at high dwell time as well as utilization of effective torque region. So, the extension of constant torque range generates high output torque without compromise in efficiency. It requires two less no. of IGBTs and additional two capacitors and four diodes as compare to conventional SR inverter. The analysis of working states is presented. The high output torque of proposed SR inverter drive without compromise in efficiency is justified from comparison of both simulation and experimental results with conventional SR inverter drive.
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