Sensorless Control of PMSM Based on Superhelical Sliding Mode Observer

The traditional sliding mode observer can cause problems such as low system observation accuracy, system jitter, and poor anti-interference ability in motor control due to the switching characteristics of the system. In this paper, the sensorless control of permanent magnet synchronous motor is realized by replacing the traditional sliding mode observer with the super-helical sliding mode observer. First, the super-helical sliding mode observer algorithm is established to reduce the vibration of the system. Secondly, a sigmoid function is introduced on the basis of the original algorithm instead of the original symbolic function. Finally, it is verified based on Matlab/Simulink simulation platform. The simulation results show that the strategy can effectively attenuate the jitter vibration caused by the sliding mode observer and improve the stability and accuracy of the position sensorless system of the permanent magnet synchronous motor.