Patent ID: 8277199
Filing Date: 2012-10-02
Classification: F04B

Abstract:
1. An apparatus for controlling an operation of a reciprocating compressor, the apparatus comprising: a current detector that detects a current applied to a motor; a voltage detector that detects a voltage applied to the motor; a stroke detector that detects a stroke based on the detected current and voltage; a controller that calculates a current speed using the detected stroke and outputs a frequency variable signal or a frequency detect signal based on a phase difference between the calculated current speed and the detected current; a load detector that detects a current operation load according to the frequency detect signal; a stroke reference value determiner that determines a stroke reference value corresponding to the detected load; a pulse width modulation signal generator that generates a pulse width modulation signal based on a difference between the determined stroke reference value and the detected stroke; and an inverter that varies a voltage and a frequency applied to the motor according to the generated pulse width modulation signal.