An efficiency optimization strategy of induction motors for electric vehicles

The electric vehicle needs the induction motor to run efficiently over the entire speed range, the dynamic torque response should also be good. Based on analyzing vector control and minimum losses control of induction motor, an efficiency optimization strategy of induction motors over wide speed range taking the dynamic torque response into account is presented in the issue. The strategy applies the decoupling idea of vector control to minimum losses control, so the efficiency and the dynamic torque response performance of motor are both considered; meanwhile, it adopts a method that compensates the rotor flux observed position in terms of reactive power in order to improve the control performance over the entire speed range especially in the field weakening region. Simulation and experimental results indicate that the strategy can increase the efficiency of induction motor and provide a good dynamic torque response performance.