Sliding Mode High Speed Control of PMSM for Electric Vehicle Based on Flux-weakening Control Strategy

To broaden the speed range of PMSM (Permanent Magnet Synchronous Motor) for the electric vehicles and to improve the stability in the high speed and small torque operating conditions of the electric vehicles, the control strategy based on flux-weakening control algorithm, using voltage feedback method, combined with SMVSC (Sliding Mode Variable Structure Control) algorithm, using the improved exponential reaching law and variable rate reaching law, is applied to the vector control system of PMSM for the electric vehicles. To solve the hysteretic nature caused by the introduction of integral link to the SMVSC algorithm, the method of the integral signal times the saturation function is adopted. Then the response speed and stability of the system are improved. Simulation results show that the good anti-jamming capability is achieved and the working conditions requirement of wide speed range is met.