An improved dtc induction motor for electric vehicle propulsion: An intention to provide a comfortable ride

This chapter presents a comparison study between two Direct Torque Control (DTC) strategies dedicated to electric vehicle applications: the basic DTC strategy with uncontrolled switching frequency using hysteresis controllers and a new strategy with fixed switching strategy using PWM torque controller. The proposed DTC strategy is developed in order to gain reduction of torque ripples and to fix torque switching frequency. The chapter also presents the obtained simulation results, dealing with both transient and steady-state operations. In order to highlight the performances gained by the improved DTC approach, the chapter considers the transient behavior of the induction motor under a reference speed, which allows its start-up, acceleration, and then deceleration. The resulting features are compared to those obtained following the implementation of the conventional DTC approach, which is considered the case of a constant load torque characterizing electric and hybrid propulsion applications.