Sensorless Control Of PMSM Based On Fuzzy Sliding Mode Algorithm

Permanent magnet synchronous motor is widely used in industry,agriculture and life.In this paper,a new combination improv ing approach law and a speed loop sliding mode variable structure controller with intuitionistic fuzzy PID are proposed in this paper,and a PMSM sensorless sensor is formed with a sliding mode observer.The control system reduces the volume and weight of the motor,shortens the adjustment time and improves the response speed,and improves the steady-state accuracy and other performances.On the basis of several common vector control methods,a new kind of control of constant flux linkage control based on new method is proposed,which improves the precision of current loo p control and system security performance.Secondly,a new sliding mode variable structure controller based on improved approach law is proposed for the traditional sliding mode variable structure control of permanent magnet synchronous motor with speed ri ng.The motion quality of the system is improved under the sliding mode variable structure control.The response speed curve of the motor has the advantages of near no overshoot and high steady state precision,but there is still a sound response.The shortage of time is not fast enough.Aiming at this drawback,a intuitionistic fuzzy PID controller is further proposed.Through the intuitionistic fuzzy set,the traditional membership function is improved,the membership information is fully expressed,the p recision of the fuzzy control is improved,and the fast response of the new method is verified by simulation.In order to explore the method of shortening the response time,the intuitionistic fuzzy PID controller is proposed on the premise that the traditional PID has a large overshoot and the traditional fuzzy PID control membership function is not sufficient.The traditional membership function is improved by intuitionistic fuzzy set,and its membership information is fully expressed.The precision of fuzzy control is improved,and the fast response of the proposed new method is verified.At last,the speed loop based on improved approach law sliding mode variable structure controller and intuitionistic fuzzy PID controller are used to form a sensorless control system with sliding mode observer,and the advantages and disadvantages of the two different controllers are compared from the observation results.A new controller based on two kinds of controller switching is proposed,and the rotational speed and angle of the PMSM are observed with the sliding mode observer.The results show that:(1)the adjustment time of the new controller is slightly better than the 0.027 s of the intuitionistic fuzzy PID controller,and is much better than the 0.222 s based on the improved convergence law controller.(2)the steady state precision of the new controller is 0.49% higher than the 1.2% of the intuitionistic fuzzy PID controller;the variance 12.37 of the speed fluctuation of the new controller is also smaller than that of its speed fluctuation variance of 19.12.It is proved that the proposed new controller has the advantages of the first two controllers,which not only have shorter adjustment time,faster response speed,but also have high steady state precision and less fluctuation.