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A novel strategy of resonant frequency tracking control for linear compressor

Linear compressor is becoming more utilized in refrigeration for high efficiency, compared with the traditional rotary motor. Both stroke and frequency controls need to implement for steadiness and efficiency. In this paper, a strategy of resonant frequency tracking control based waveform fitting phase detection is presented to optimize the efficiency of the compressor. Compared with zero crossing phase detection, which is sensitive to signal interference and DC bias, waveform fitting phase detection is more accurate in detecting phase difference between displacement and current. Dual stroke and frequency control loop are implemented in experiment. Simulation and experimental results verify the effectiveness of the proposed algorithm.