Research And Realization Of Sensorless Control Of Permanent Magnet Synchronous Motor

With the continuous research and innovation of permanent magnet materials and control algorithms,permanent magnet synchronous motors(PMSM)have gradually been applied to various fields of life.Traditional PI control algorithm as one of the classical algorithm of closed loop controller is designed,some high-performance systems cannot fully meet the control requirements,and the rotor position and speed information as an important feedback closed loop control system,traditional access way is to use the mechanical sensor such as photoelectric encoder,this will increase the volume and cost of system directly,It’s also limited by the surrounding environment.Therefore,in order to solve the above two problems,this thesis takes the three-phase surface-mount PMSM vector control system as the research object,and conducts related research on the dual closed-loop controller and sensorless control technology.First,establish mathematical models based on three-phase surface-mount PMSM in different coordinate systems,introduce vector control systems,and introduce space vector pulse width modulation technology.A three-phase surface-mount PMSM vector control system based on PI controller was built on the MATLAB/Simulink simulation platform.Secondly,based on the theoretical basis of backstepping control algorithm and super-twisting sliding mode control algorithm,speed loop controller and current loop controller are designed respectively for the double closed-loop speed control system.In order to further improve the anti-load interference performance of the system,a load observer is designed for torque observation compensation.A three-phase surface mount PMSM vector control system based on feedforward compensation backstepping sliding mode control is established.The simulation results show the superiority and feasibility of the control algorithm.Then,improve the sensorless control.Design a sliding mode observer on the basis of sliding mode control theory,combine the arctangent function method to obtain the rotor position,improve the sign function and add appropriate angle compensation to further improve the observation accuracy,and introduce a compensated inversion sliding mode controller to improve speed regulation System performance.Simulation shows that the control algorithm has good dynamic performance and observation accuracy.Finally,build a PMSM experimental platform based on the DSP control chip The software and hardware design parts are introduced respectively,and the algorithm adopted in this thesis is verified by the experimental platform.