电动汽车永磁同步电机最优弱磁控制策略

In this paper, a field-weakening control strategy for electric vehicles is proposed with torque control as objective. The characteristic curves of the peak torque and switching torque of motor are obtained by off-line calculation. On this basis and based on feedback speed and target torque, the field-weakened working points in d-q coordinates of motor are constantly updated and move within the region with the curve of the ratio of peak torque over current, current limit circle and the curve of the ratio of peak torque over voltage as boundaries. As a result, the torque response speed and operating efficiency of motor under complex working conditions are enhanced. Simulation with Matlab/Simulink verifies the feasibility of the control strategy proposed and the improvement of vehicle performance.