Effects of the driving voltage waveform on the performance of vapor compression cycle system driven by the moving coil oil-free linear compressor

•Effects of the driving voltage waveform on linear compressor are studied.•The sine without the trough waveform can reduce the piston offset.•The motor efficiency of three waveforms is lower than that of sine waveform.•The COP of sine without trough waveform is maximum at same frequency.