Abstract
For the purpose of cooling high-temperature superconductor (HTS) devices, superconducting motors, SMES and fault current limiters, a large cooling capacity Stirling-type Pulse tube cryocooler (SPTC) has been developed by Sumitomo Heavy Industries, Ltd (SHI). The design concepts of cryocooler are high efficiency, compact size, light weight, and high reliability. We have developed a cryocooler with a design target of producing a cooling capacity of 200W at 77K. As the experimental results show, the cooling performance of the In-line type expander achieved a cooling capacity of210W at 77K, a minimum temperature of 37K with a compressor input power 3.8kW, an operating frequency of 48Hz〜60Hz, and a compressor efficiency of 74%. Moreover, for miniaturization a U-type expander was tested and the performance is about 10% less than that of an In-line type expander. The cooling capacity degradation caused by inclination to the expander was within 3%. The experimental results of the high power SPTC will be reported in this paper.
