Closed cycle gas refrigerator

摘要

A refrigerator has a reciprocation portion including a piston and a portion of a linear motor and having an angular resonance frequency W defined by the following equation: <IMAGE> where m=total mass of the reciprocation portion Sp=area of a working surface of the piston Pa=amplitude of pressure variation of a working gas in a compression space of the refrigerator alpha =phase difference between a displacement of the piston and pressure variation of the working gas in the compression space S=stroke of the piston Ks=spring constant of a support spring of the piston and an a.c. power source for driving the reciprocation portion, the power source has an angular frequency Wo substantially equal to said angular frequency W with an acceptable error therebetween being +/-10%.