Patent ID: 7520730

Claim:
An apparatus for controlling an operation of a compressor comprising: a back electromotive force calculator for calculating a back electromotive force of the compressor based on a value of a current applied to a motor of the compressor and a value of a voltage applied to the motor of the compressor; an operation frequency reference value determining unit for detecting a mechanical resonance frequency of the compressor based on the back electromotive force value and the current value and determining the detected mechanical resonance frequency as an operation frequency reference value; and a controller for varying an operation frequency of the compressor according to the determined operation frequency reference value, wherein the operation frequency reference value determining unit multiplies back electromotive force (BEMF) values and current values during one time period and determines an operation frequency when the sum of multiplied values is the maximum as the operation frequency reference value wherein the one time period corresponds to one oscillation cycle of the compressor.