Zero torque control of switched reluctance motors for charging reactor of electric vehicles

In this paper keeping position and zero torque (KP-ZT) control of switched reluctance motor (SRM) drives is proposed to avoid any movement when used for charging reactor in electric vehicles. A sliding mode position control technique as an outer loop and zero torque control method as an inner loop are used to attain this. Whereas, power factor correction (PFC) and voltage regulation is achieved with buck type integrated SRM drive by conventional boost converter for wide input and output voltage range. In this two stage PFC topology, multi-phase SRM drive operates as a high power interleaved buck converter to reduce cost, size, weight, and volume of battery charger with high reliability, improved power quality and low battery current ripple. Then, In order to implement the proposed ZT control, an online method is proposed to calculate current reference in each phase with regarding to zero torque condition. Finally, Lagrange optimization method is used for copper loss minimization during battery charging and results are compared with the case of using an extra clutch to let the motor to move.