LINEAR COMPRESSOR CONTROLLER

摘要

A sensorless method and apparatus for detecting piston collisions in a free piston linear compressor motor. The waveform of the back EMF incuded in the motor stator windings is analysed for slope discontinuities and other aberations in a time window centred on the back EMF zero-crossings. Waveform slope artifacts are indicative of piston collisions and cause the motor power to be decremented in response.