An apparatus for controlling an operation of a reciprocating compressor
includes a voltage detecting unit for detecting a positive half-wave
voltage of an AC voltage applied to a motor of the reciprocating
compressor; a current detecting unit for detecting a positive half-wave
current of the AC current passing through the motor; a voltage and
current estimating unit for estimating a negative half-wave voltage of
the AC voltage applied to the motor and a negative half-wave current of
the AC current passing through the motor based on the detected positive
half-wave voltage and the detected positive half-wave current; a stroke
estimating unit for estimating a stroke of the reciprocating compressor
based on the detected positive half-wave voltage and the detected
positive half-wave current and the negative half-wave voltage and the
negative half-wave current which have been estimated by the voltage and
the current estimating unit; a stroke controller for outputting a stroke
control signal of the reciprocating compressor based on a comparison
value between the estimate stroke estimate value and a stroke reference
value of the reciprocating compressor; and a power source unit for
applying positive DC power to the voltage detecting unit and the current
detecting unit.