Research On Permanent Magnet Synchronous Motor Drive Control System Based On Position Sensorless Control

With the maturity of motor control technology,permanent magnet synchronous motors（PMSM）occupy an important position in AC servo systems with their many advantages.In permanent magnet synchronous motor control,the motor control algorithm,inverter modulation technology,motor rotor position and speed detection are all key factors for adjusting the control performance of the system.Aiming at the system complexity,low adaptability and high cost of traditional mechanical sensor detection methods,this paper discusses an extended Kalman filter position sensorless control method based on fuzzy PI control,through principle explanation,model establishment,software and hardware system development,the physical prototype was developed,and the experimental tests were carried out on the corresponding experimental platform and the application environment of the submersible electric pump.First of all,this article introduces the mathematical model of permanent magnet synchronous motor in detail.Through the control strategy of4)₍（9）=0 in the vector transformation,the double closed-loop control of the motor control system is completed.At the same time,the principle and implementation method of space vector pulse width modulation technology are introduced.A simulation model was established to verify the rationality of the system.Secondly,in view of the problem that the PI governor parameters in the permanent magnet synchronous motor control system cannot be adjusted online,the fuzzy control principle is introduced to realize the adaptive correction of the fuzzy PI controller parameters of the speed loop,thereby achieving high-precision motor control.A vector control model of permanent magnet synchronous motor based on extended Kalman filter algorithm is built.Based on the above simulation model,fuzzy control is performed on the speed loop PI controller.The simulation results show that the improved scheme can complete the speed controller parameter adaptation,while also making the control system more responsive and more stable.Finally,with the STM32F446 chip as the core,the software and hardware structure of the control system and the physical prototype verification system were designed,and the software and hardware tests of the system were completed on the experimental platform.Finally,the corresponding application was completed on the permanent magnet synchronous motor submersible pump Experimental test.The experiment proves that the extended Kalman algorithm of the improved speed loop PI controller not only completes the controller parameter adaptation,but also improves the motor control accuracy and response speed.The control strategy has practical application value.