Implementation of Magnetizing-Freewheeling Control Strategy to Increase SRM Regenerative Braking Performance in a Low-Speed Operation

Switched reluctance machine is a modern electric motor that is suitable for an electric vehicle. It is widely used in electric vehicles because it has a simple rotor construction and wide speed range that can be operated at high temperatures making it suitable for electric vehicles. Conventional Braking causes energy lost in an electric vehicle. Regenerative braking takes advantage of the excess kinetic energy wasted when doing conventional braking and then flows it back to the battery for charging. Regenerative braking on the SRM takes advantage of the negative torque. The low-speed conditions will be very ineffective for SRM because the negative torque value becomes small. This paper will propose a braking method using a magnetizing-freewheeling control strategy. This method can improve regenerative braking performance by increasing the negative torque due to low-speed operation.