Patent ID: 7456592
Filing Date: 2008-11-25
Classification: F04B

Abstract:
1. An apparatus for controlling operations of a reciprocating compressor comprising: a stroke estimator for calculating a stroke estimate value on the basis of values of a current and a voltage applied to a motor of the reciprocating compressor; a compressor control factor detecting unit for detecting a compressor control factor to detect a stroke value corresponding to a point where TDC (Top Dead Center)≈0 on the basis of the calculated stroke estimate value of the reciprocating compressor and the values of the current and the voltage applied to the motor of the reciprocating compressor; a stroke reference value determining unit for determining a stroke reference value on the basis of the detected compressor control factor; and a controller for varying a voltage applied to the reciprocating compressor according to a comparison result between the determined stroke reference value with the calculated stroke estimate value.