Patent ID: 7665972
Filing Date: 2010-02-23
Classification: F04B

Abstract:
1. An apparatus for controlling an operation of a reciprocating compressor, comprising: a resonance frequency calculating unit for calculating a mechanical resonance frequency of the reciprocating compressor; wherein the resonance frequency calculating unit calculates a gas spring constant on the basis of a current applied to a motor of the reciprocating compressor and a stroke of the reciprocating compressor, and calculates a mechanical resonance frequency on the basis of the calculated gas spring constant, and the gas spring constant k wherein α represents a motor constant of the motor, I(jω) represents the current value detected in the motor of the reciprocating compressor, X(jω) represents the stroke value detected in the reciprocating compressor, θ i,x represents a phase difference between the current applied to the motor and the stroke detected in the reciprocating compressor, m represents a moving mass, ω represents 2×π×f c (f c is the current operating frequency of the reciprocating compressor), and k m represents a mechanical spring constant of the reciprocating compressor an operating frequency reference value generation unit for comparing the calculated mechanical resonance frequency with a current operating frequency of the reciprocating compressor, and generating an operating frequency reference value according to the comparison result, wherein the operating frequency reference value generation unit decreases the current operating frequency by a preset level and generates the decreased operating frequency as the operating frequency reference value when a difference value obtained by subtracting the calculated mechanical resonance frequency from the current operating frequency is larger than an upper limit value of a preset operating frequency domain, and the operating frequency reference value generating unit increases the current operating frequency by a preset level and generates the increased operating frequency as the operating frequency reference value when a difference value obtained by subtracting the calculated mechanical resonance frequency from the current operating frequency is smaller than an upper limit value of a preset operating frequency domain; and a controller for controlling an operating frequency of the reciprocating compressor according to the generated operating frequency reference value.