Investigations of a 450 g micro moving-coil linear compressor operating at 200 Hz.

Abstract

This paper presents the design and optimization of a micro moving-coil linear compressor for Stirling-type pulse tube cryocoolers. The overall mass of the compressor is less than 450 g. It is designed to operate at a high frequency of around 200 Hz, which is developed with the modified scaling method based on the typical mid-sized compressors in the authors’ laboratory. The scaling factors of moving mass and linear motor are studied in detail. A three-dimensional model is built to simulate the magnetic field in the micro linear compressor. The non-uniform magnetic field influences the direction of the specific thrust which decreases the efficiency of the linear compressor. The micro linear compressor is worked out and then coupled with a pulse tube cold finger, which can provide a cooling power of 0.85 W at 77 K.