Interior Permanent Magnet Synchronous Motor has the advantages of wide speed range,large torque current ratio,high power density,high efficiency,high power factor and low noise,etc.It has been widely applied to industrial areas such as in electric vehicles now.The basic requirements for vehicle’s Interior Permanent Magnet Synchronous Motor driving system are: at lower speed,it can output large torque to meet the performance requirements of starting-up,acceleration and climbing etc.And,at higher speed,it should have wide speed range to meet the performance requirements of high-speed driving,overtaking etc.This paper designs a kind of Flux-weakening Control method basing on speed loop Sliding Mode Variable Structure Controller for Interior Permanent Magnet Synchronous Motor,by combining Maximum Torque Per Ampere and vector control strategies to control Interior Permanent Magnet Synchronous Motor.In the low speed running stage,this paper researches the Maximum Torque Per Ampere control strategy to coordinate the relationship between torque and current.And,in the high speed running stage,this paper studies the Flux-weakening control strategy to coordinate magnetic flux with speed.During the Flux-weakening Control phase above the base speed,the Anti-windup Integral Controller is introduced into the current loop to prevent the current regulator entering the saturated state.At the same time,in order to further improve the utilization rate of the dc bus voltage and expand the flux-weakening operating range at high speed,a SVPWM over-modulation unit is introduced to contravariant the dc bus voltage.By comparing to the simulation results of the conventional PI controller,more reliable control performance of the proposed sliding mode control algorithm is demonstrated.In comparison with the simulation results of the traditional lead angle method,more prominent flux-weakening performance of the proposed flux-weakening method in this paper is illustrated. |