The purpose of this study is to compare and analyze the conventional constant-speed compressor driven by an induction motor and the BLDC-applied capacity variable compressor in order to improve the energy efficiency of the refrigeration system. Through this study, it was found that, when a reciprocating hermetic compressor is operated, more power is consumed than a BLDC compressor due to the consumption of current through the instantaneous starting capacitor when operating at a constant voltage than a BLDC compressor.

Simulation program for the analysis of compressor shaft is developed. The program cover dynamic analysis, oil supply analysis, and bearing analysis. Each of the analysis modules is integrated in object oriented way. Behavior of shaft is measured and compared with the analysis results. Through the analysis and experiment, it is shown that the simulation predicts the experimental results very well. The integrated simulation program is applied to design of compressor shaft, and shows that the compressor shaft system can be designed fast and conveniently.