Implementation of Optimum Switched Reluctance Machine Regenerative Braking Using Magnetizing-Demagnetizing Control with Duty Cycle Settings

Abstract

Switched Reluctance Machines (SRM) is one of the machines that are used for electric vehicles due to its several benefits, including a simple structure without winding installation on the rotor and without the use of permanent magnets. Energies during conventional braking are wasted into heat, so regenerative braking is used to reduce wasted energy when braking. There are several methods for regenerative braking for SRM, but a method is needed to increase braking efficiency for low speeds. The regenerative braking method using PWM magnetizing-demagnetizing with duty cycle settings is proposed in this paper. With precise excitation to the SRM stator winding and proper duty cycle setting for magnetizing-demagnetizing method, an optimum regenerative braking can be obtained. This method can optimize the braking speed and charging current to the battery even at a low speed. Experimental work has been done to demonstrate the impact of changing the duty cycle on regenerative braking.