Control Strategy of the Interior Permanent Magnet Synchronous Motor Based on Single Phase-Locked Loop Position Fusion Attenuation
In order to improve the performance of sensor-less interior permanent magnet synchronous motors when switching from low speed to high speed,a single phase-locked loop position fusion strategy is proposed.At zero low-speed operation,high-frequency pulse signals are injected into the voltage while the rotor position informa-tion is obtained by processing the amplitude of the feedback output current;At medium and high-speed operation,an extended current sliding mode observer is established to obtain the counter electromotive force value,thereby,ob-taining the rotor position information yet;During the tran-sition zone operation,it is considered that the impact by the injected voltage amplitude on the rotor position observation system,thus,a new fusion attenuation function is construct-ed to fuse the rotor position error information estimated by two sensor-less algorithms,then,inputting the fused rotor position error information into the single phase-locked loop to decouple and achieve the rotor and speed information.Finally,the verification tests show that the control strategy is able to achieve a smooth switch between the sensor-less algorithms under different conditions,improving the accu-racy of rotor position observation.
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