基于逆变器非线性扰动抑制的车用电机低速无感控制方法研究OA

In the traditional high-frequency square-wave signal injection method used for sensorless control of vehicle motors at low speeds,the fixed amplitude of the injected voltage causes the high-frequency response current-which contains the decoded rotor position signal-to distort under the influence of inverter nonlinearities.Especially when the motor operates under low-load conditions,this distorted current will cause severe motor torque ripple,resulting in significant disturbance errors in the rotor position estimation signal and directly impairing the safety and reliability of the sensor-less system.On this basis,a suppression method that adaptively adjusts the injection voltage amplitude in response to inverter nonlinear disturbances is proposed.The simulation results demonstrate that,in comparison with the conventional fixed-amplitude injection method,the proposed approach can improve the maximum rotor position estimation accuracy by up to 10.7° across the entire low-speed load range of vehicle motors.Furthermore,the maximum errors in rotor position estimation,torque pulsation and speed estimation are all maintained within 0.5%.These findings confirm that this method has strong capability in suppressing nonlinear disturbances and can significantly enhance the stability and control precision of low-speed sensorless systems for vehicle motors.This method has the simple principle and low implementation cost,which has significant engineering application value.