Direct Torque Control Of Permanent Magnet Synchronous Motor Based On Adaptive And Fuzzy

Because of small volume,light weight,high efficiency,torque and power densities, maintenance convenience,Permanent magnet synchronous motor becomes the best choice in many applications servo motor,especially in high torque,high-precision the occasion required response.With direct torque control method for structure is simple,for the dynamic response is swift and easy to realize the algorithm.Therefore,the direct torque control in Permanent magnet synchronous motor has become the research focus in the field of AC drive.This paper takes the direct torque control in Permanent magnet synchronous motor as the main research topic, the structure and classification of Permanent magnet synchronous motor is introduced first, and then its application prospects are summarized, and the development of its control technique is discussed.On the analysis of the three-phase to two phase of coordinate transformation is presented, based on which the simple mathematical model and the equations of motion are build.Then thoroughly discusses the theory of the direct torque control in Permanent magnet synchronous motor,and detailed analysis of its torque ripple and weak anti-interference ability and robustness problems.To solve this problem,take a new method based on adaptive fuzzy control technique on the direct torque control.One feature of the method is the choice of the space vector based on fuzzy, and the applied space vector after the chain and torques error were fuzzied and defuzzied.The other feature of this method is making the use of the ADRC to replace the traditional PID controller at the speed circle.By putting the transition process for speed and estimating the realtime'state'of the load,the accurate reference of the toque signal is get.Last,with the help of MATLAB/SIMULINK tool set up a complete simulation model and simulate this system. The simulation experiment verify the avaliable of the adaptive fuzzy control strategy,by comparing with the normal direct torque control, the new method of control is better than that of the conventional direct torque control,not only in the reduction of permanent magnet synchronous motor torque ripple,and its anti-interference ability and robustness are enhanced.,the quality of the dynamic and static practicability are improved.and the new controller has a great practicality.