This paper is concerned with rolling piston type rotary compressor for air conditioner, rotating motion of the rolling piston is theoretically analysed using mathematical model which consists of dynamic equation of rolling piston, equation of force equilibrium and equation of bearing characteristic, Also the motion in operating compressor is measured by detecting the change of electrostatic capacity between rolling piston face and electrode mounted on cylinder head surface. After signal analysis, it is proved that rolling piston is sliding positive and negative alternately on the vane tip and it is rotating forward slowly around its center. Theoretical results are in good agreement with experimental results and the validity of the model is verified.
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