Year : 2013, Volume : 38, Issue : 1to4
First page : ( 207) Last page : ( 211)
Print ISSN : 0379-0479. Online ISSN : 2349-2120. Published online : 2013  3.

Optimization of a moving magnet linear motor for opposed piston two stage stirling cryocooler

Rajesh V. R.¹, Kuzhiveli Biju T.¹

¹National Institute of Technology Calicut, Calicut, Kerala, India-673601.

Abstract

A two stage Stirling cooler is composed of a compressor unit, cooler electronics and two stages of Stirling coolers; i.e., two sets of regenerator and displacer body. A moving magnet linear motor is designed for an input power of around 120W to achieve cryogenic temperature at the cold end of the cooler. The two pistons, mounted on the opposite ends of the same shaft, are driven by the linear motors. The cooling capacity in the cold head is generated by the combined motion of the displacer and a pressure wave developed by the pistons. The temperature reduction is achieved in two stages viz., in first stage 90K with 1W and in second stage 30K with 200mW heat lift. The optimization analysis of various electromagnetic and geometrical parameters of the moving magnet linear motor for the system is required to achieve the desired objectives as the active magnet height varies periodically with respect to time. The present work is dealt with the optimization analysis of the linear drive to power the pistons.

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Keywords

Stirling cooler, Two stage, Electromagnetic.

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