Abstract:In order to solve the problem of the loss of iron core and saturation inductance in the optimization control of constant power and wide speed of internal permanent magnet synchronous motor for electric vehicle，a new method of minimum loss control for a permanent magnet synchronous motor is proposed. This strategy uses synchronous motor loss model is simplified，and the iron loss and variable inductor saturation effect on the system performance is considered，this control strategy simplified minimum loss efficiency optimization control conditions.The simulation and experimental results show thatthe proposed method is simple and effective，has higher efficiency and better energy saving effect，and has good application value in the value of new energy electric vehicles.