PMSM Low Speed Sensorless Control Based on Improved High Frequency Pulse Injection Method
In the high frequency pulse vibration injection method of zero voltage domain at low-speed permanent magnet synchronous motor(PMSM)without position sensor control,the use of multiple filters and the stability of the observer will affect the precision of rotor position.In order to improve the filtering accuracy,dynamic performance and immunity of PMSM rotor position observation loop,and improve the performance of the control system,this paper proposes a position sensorless control strategy in the low-speed domain of PMSM based on an improved high frequency pulse injection method,and verifies its effectiveness.Firstly,a multi-frequency adaptive notch filter(MANF)is used to filter out the harmonic components of different frequencies in the high-frequency signal,and the accurate position error signal is obtained.Secondly,the total disturbance of the system is expanded into a new state variable,and a linear expanded state observer is designed to observe the rotor position,speed and torque to improve the accuracy of the rotor position observation.Finally,the validity is verified by the 0.26kW PMSM position sensor control performance test experimental platform.The results show that compared with the traditional high-frequency pulse voltage injection method,the proposed method can effectively reduce the position observation errors of the motor under steady state,variable speed and variable load conditions,and improve the dynamic performance and stability of the control system.
PMSMsensorless controlhigh-frequency pulsating voltage injection methodposition error signal extractionposition estimation
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