Comparative study of induction motor efficiency optimization control strategy for electric vehicle

Electric vehicles must extremely improve its electric drive system efficiency and effectively use its limited energy. In this paper, a structure diagram of the induction motor in synchronously rotating frame of reference including iron loss is given at first, the losses of induction motor in operation is discussed and an efficiency optimization control strategy of induction motor driving system based on loss model is proposed. then a comprehensive analysis of the efficiency optimization control strategy based on search, minimum stator current and loss model respectively is presented to discuss the distinction and links among them. The experiment system is built with DSP TMS320LF2407A, the experimental results show that the loss model based efficiency optimization control strategy can reach global optimum without additional hardware. It has a fast optimization speed and a fairly stable torque and speed in the optimization process.