Research On Sensorless Control Method Of Circular Permanent Magnet Synchronous Motor

With the rapid development of semiconductor,IC manufacturing,laser manufacturing and liquid crystal technology,the requirements for automatic production equipment are getting higher and higher.In the mechanical manufacturing,electronics and other industries,the traditional transmission mode has been unable to meet the system high speed,high precision,flexible layout requirements.Based on this,this paper proposes a flexible positioning platform system based on circular permanent magnet synchronous motor.Its high speed and high precision motion mode realizes the back-and-forth transportation of the positioning system and improves the production efficiency.Because of the special structure of the circular permanent magnet synchronous motor,the traditional mechanical sensors cannot meet the requirements.However,the sensorless technology is more and more mature in permanent magnet synchronous motor,so this paper studies the sensorless control method of circular permanent magnet synchronous motor.Firstly,in view of the structural particularity of the circular stator orbit,the change rules of the inductance and magnetic linkage of the circular permanent magnet synchronous motor are analyzed by theoretical calculation and finite element simulation,and on this basis,the mathematical model of the circular permanent magnet synchronous motor is established.Matlab/Simulink was used to build the vector control system of the motor,which laid a foundation for the subsequent control simulation without position sensor.Secondly,aiming at the senseless control of the stator arc section,a full-order flux observation method based on the extended inverse electromotive force is studied,the velocity error is analyzed and the observer is pole assignment.According to the extended back electromotive force equation,the adaptive law of the model reference adaptive algorithm is used to estimate the velocity.Then,for the stator transition's sensorless control,the exponential approach law sliding mode observation method based on the extended back electromotive force is studied,which can effectively reduce the chatteriness of the system and guarantee the convergence speed.In view of the large thrust fluctuation of transition,a Luenberger observer was built to observe the load disturbance,and the influence of the disturbance on the observation was effectively suppressed.Finally,on the basis of theoretical analysis,the experimental platform of the drive control system of the circular permanent magnet synchronous motor is built,and the software and hardware algorithms are designed.The correctness and effectiveness of the sensorless control method are verified by experiments.