Research And Design Of Position Sensorless Vector Control System For IPMSM

Permanent magnet synchronous motor(PMSM)has been widely used in the past decade due to its high efficiency,no excitation winding,high power density,no mechanical commutation device and other advantages,especially the high-precision servo control and the rapid development of electric vehicles,which put forward higher requirements for the vector control performance of synchronous motor.In recent years,with the wide application of the third generation semiconductor devices and the birth of various high-speed microprocessors,the field of synchronous motor control is developing towards the direction of high power density,high reliability and high robustness.At present,the research of synchronous motor control system mainly focuses on the following two aspects(1)Rotor position calculation in sensorless system.Limited by the installation volume and the stability of the encoder,the vector control system is developing in the direction of sensorless.How to obtain the rotor position in real time in the sensorless system and cover the full speed range.(2)Optimization of vector controller.In practical application,the load is usually uncertain,and the traditional linear controller is designed for a specific load condition,so it is difficult to guarantee the high performance control in the whole operating range.How to further improve the performance of the controller and enhance its robustness.The first chapter of this paper introduces the mathematical model of PMSM and the basic coordinate transformation theory.The mathematical model of PMSM in three different coordinate systems and the basic principle of vector control are analyzed.In the second chapter,the sensorless vector control principle of PMSM Based on square wave high frequency injection method is introduced,and the rotor position observer is improved,which makes the convergence speed faster and has stronger robustness.In the third chapter,the relative problems of synchronous motor speed control are mainly introduced.The more robust sliding mode controller is used to replace the traditional PI controller,and the tracking differentiator is used to weaken the chattering of sliding mode controller.Finally,a hardware in the loop virtual simulation platform of synchronous motor based on stm32G4 is built to verify the proposed methods.