To address the issues of low observation accuracy and oscillations in traditional sliding mode observers,a super-twisting sliding mode observer was adopted by research group to replace the traditional sliding mode observer for sensorless control of permanent magnet synchronous motors.The speed information was integrated into the cutoff frequency of the low-pass filter,and a phase-locked loop module was used to replace the arctangent function in the rotor position and speed estimation module.To ensure the stable operation of the improved control system,Lyapunov theory was used to conduct in-depth analysis and research on stability of the system.Through a series of experiments,the effectiveness of this strategy in sensorless control applications has been verified,effectively reducing the chattering caused by sliding mode observer and improving the observation accuracy of sensorless system of permanent magnet synchronous motors.
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