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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.
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Basic Information:
DOI：10.16652/j.issn.1004-373X.2026.20.004
Citation Information:
[1]Ji Shuai, Yang Pan, Li Feng ,et al.Method of vehicle motor low-speed sensorless control based on inverter nonlinear disturbance suppression[J].Modern Electronic Technique,2026(20):22-29.DOI:10.16652/j.issn.1004-373X.2026.20.004.
Fund Information:
国家自然科学基金项目（52167006）