Abstract
AbstractThis paper analyses energy conversion in BLDC motors during regenerative braking for an electric three-wheeler. For a BLDC motor to act in braking mode the back emf generated should be greater than the terminal voltage. So, the back emf is boosted to a high voltage so that braking can be applied to lower speeds. The step-up of the back emf is accomplished by modifying the switching scheme to the inverter, utilizing the winding inductance. This ultimately acts as a boost converter which eliminates the use of an extra inductor and converter. MATLAB Simulink model is developed for BLDC motor in drive mode and regenerative braking mode. A driving scenario that incorporated both running and braking modes is considered. The simulation results verify the regenerative braking operation of the proposed system. Energy recovery calculations showing how much this strategy is useful are depicted. Moreover, a hardware prototype is developed and tested in the laboratory.KeywordsBLDC motorElectric vehicleRegenerative braking
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