In traditional sensorless control strategy of permanent magnet synchronous motor(PMSM),rotor position is usually observed by back electromotive force(EMF)or flux linkage.The low signal-to-noise ratio at low operating speed leads to the deterioration of the observer based on EMF.In contrast,the flux observer performs better at low speeds.This paper studies the sensorless control of permanent magnet synchronous compressor based on the active flux,and the rotor position can be directly obtained by orienting the active flux.In order to solve the problem that open-loop flux observer is easily affected by motor parameters,a closed-loop active flux observer based on the hybrid model of voltage and current is constructed.Then,PI parameters of the closed-loop flux observer are designed,and the rotor position observation is realized by using normalized orthogonal phase-locked loop.Finally,the effectiveness of the proposed strategy is verified on an experimental platform of permanent magnet synchronous compressor.
Permanent magnet compressorSensorless controlActive fluxVoltage-current hybrid model
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