Abstract
In view of the position sensorless control system of permanent magnet synchronous motor (PMSM) under medium and high-speed conditions, the use of traditional sliding mode observers is prone to problems such as speed and high-frequency jitter and three-phase current distortion. In this paper, a saturation function consisting of an arctangent function is used instead of a discontinuous switch symbol function at the zero point to improve the speed stability and improve the three-phase current distortion problem. Simulations in MATLAB/Simulink compare the speed and three-phase current which is sliding mode observer between the traditional and the improved, the later can effectively suppress the speed jitter and three-phase current distortion.
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