Investigation on Voltage Boosting Technique in Four Phase SR Motor Drive with Front End Converter

In this work, a quasi-impedance source (QIS) converter is employed as a front-end converter for four-phase switched reluctance (SR) motor drive. The QIS converter is used for dc-link voltage boosting and to enhance the dynamicperformance. The proposed converter can increase the power output in each stage, by increasing the excitation voltage and controlling based on the drive specifications. The demagnetisation terminal is separated from the excitation terminal, and then the voltage is increased further to achieve the quick commutation. Therefore, with the proposed converter, the SR motor can operate with higher voltages at each interval to reach the end goal of faster excitation and commutation. Thus, it eliminates the production of negative torque and reduces the torque ripple. Initially, the steady-state characteristics have been analyzed with the classical asymmetric bridge (CAB) converter and the proposed converter. According to the steady-state characteristics, the proposed converter can provide higher torque and increased power output than the CAB converter. The effectiveness of the proposed converter is validated in a MATLAB/Simulink environment and compared with the CAB converter. Finally, the experimental response is tested using Xilinx SPARTAN 6 FPGA processor and compared with the simulation results.