Electric Differential with Svpwm Direct Torque Control Using Five-leg Inverter for Electric Vehicles

The stability control of two separate electric vehicle (EV) motors by using only single five-leg inverter (FLI) is the motivation of this study. This paper proposes an electric differential (ED) in a FLI to serve dual separate induction motor (IM) drive-based wheels of an EV traction drive system. FLI is developed to replace the two normal three-phase voltage source inverters that need to independently control the two separate IMs at each of the EV wheels. Stability problem will be tackled by electric differential (ED) algorithm. The proposed traction drive employs space vector pulse width modulation direct torque control (SVPWM DTC) modulator with duty cycle merging algorithm as the switching sequence of the FLI. This technique allowed any portion of DC bus voltage to be allocated to any motor. Simulations were performed. The resulting control performance; speed, torque, and current verified the stability and robustness of the system. This study implies that there is possibility of using only one inverter (FLI) in order to drive two separate IM drive-based wheels without jeopardizes the system stability and robustness.