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Regenerative Braking Efficiency Enhancement using Pole-Changing Induction Motor

Research on electrical motors is important while developing an overall efficient powertrain of electric vehicle. Even though permanent magnet synchronous motors (PMSMs) exhibit greater efficiency in the low and medium speed region, the performance of such motors degrade in the field weakening region. Therefore, there is a need to explore alternatives for extended speed range of operation. Traditional squirrel cage induction motors have limited speed range due to their high leakage factor. Use of pole reconfiguration techniques can help such motors to extend the speed range of operation. This work investigates the efficiency improvement of regenerative braking controller by extending the constant power region through the method of pole changing. Criteria for selection of pole in regenerative mode of operation has been proposed. Simulation studies conducted through MATLAB/Simulink has been reported. Experimental validation of pole-changing controller has been conducted and sample experimental result has been shown.