Research On PMSM Sensorless Control Technology Based On High-frequency Injection Method

Permanent magnet synchronous motor has advantages that other motors cannot match in the industrial field of permanent magnet synchronous motor.Its structure is relatively simple,its volume is small,and its power density is high.A mechanical position detection device is widely used in traditional control to detect the position of the rotor.However,the mechanical position sensor will lead to the complicated structure of the motor and the increase of cost,which also greatly reduces the application field of PMSM.Therefore,the promotion of sensorless control technology cannot be delayed.In this paper,the anti-integration saturation pulse high-frequency injection method is studied on the surface-mounted permanent magnet synchronous motor,and the positionless control technology is deeply studied in terms of improving the dynamic performance and steady-state accuracy in the zero-low speed section.The main research contents are as follows.1.The physical model of the permanent magnet synchronous motor is studied,the mathematical model of the motor is established,and the commonly used vector control strategies,the current control strategy and the voltage space vector modulation strategy are analyzed.2.In order to improve the accuracy of inverter dead-time compensation,a dead-time compensation scheme of adaptive filter is proposed.In order to reduce the harmonic interference of the motor parameter error and current detection error on the position error information,the anti-saturation integral PID is designed to reduce each harmonic of the position estimation error signal to ensure that the generated harmonic will not affect the acquired position.The estimated error signal information causes interference,thereby achieving the improvement of the estimated speed and position accuracy and the improvement of the response speed.3.The simulation model is built in Matlab/Simulink,and the obtained simulation results are observed,analyzed and calculated,which proves the theoretical feasibility of the improved scheme.Finally,the hardware part and software program of the experimental platform are designed,and the construction of the platform is completed.After the experimental platform is built,experiments are carried out to verify the effectiveness and feasibility of the optimization scheme.It is proved that the improved pulse vibration high-frequency injection method has a good effect on improving the accuracy and responsiveness of the motor speed and position.