According to the mathematical model of the three-phase asynchronous motor on the three-phase static axis system(ABC),it can be determined that the three-phase asynchronous motor is a nonlinear and strongly coupled complex system.In order to achieve vector control,the dynamic mathematical model of linear decoupling of asynchronous motor on rotating axis system(MT)is obtained by means of coordinate shafting transformation under the condition of rotor flux orientation,and the speed and flux closed-loop vector control speed regulation system with inner torque loop is constructed on this basis.In order to further improve the performance of the control system,the link of flux observer and current hysteresis comparator are designed.The simulation results show that the vector control speed regulation system has good performance such as fast response speed,strong anti-interference abili-ty and good robustness.
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