Sensorless Control of PMSM Based on Enhanced Sigmoid Function
In traditional sliding mode observers for permanent magnet synchronous motor(PMSM),high-frequency jitters and phase lags caused by using sign function during zero-point switching are ob-served.To address these issues,an enhanced sigmoid function was introduced to replace the sign func-tion,so as to mitigate high-frequency jitters during zero-point switching.At the same time,an angle compensation algorithm was used in conjunction with a phase-locked loop(PLL)to estimate rotor posi-tion and reduce angle estimation errors caused by high-frequency jitters.A model was constructed in Simulink for simulation.The simulation outcomes indicate that the new control method greatly suppress-es jitter and improves robustness compared to conventional observers.
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维普
