Development of moving magnet type linear motor for dual piston compressor for pulse tube cryocooler

Karunanithi, R and Jacob, S and Gour, Abhay Singh and Damu, C and Das, M (2012) Development of moving magnet type linear motor for dual piston compressor for pulse tube cryocooler. In: Advances in Cryogenic Engineering: Transactions of the Cryogenic Engineering Conference - CEC, 13–17 June 2011, Spokane, Washington, USA, pp. 525-531.

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Abstract

This paper describes the design, fabrication and testing of a moving magnet type linear motor of dual piston configuration for a pulse tube cryocooler for ground applications. Eight radially magnetized segmented magnets were used to form one set of a magnet ring. Four magnet rings of such type were constructed, in which one pair of rings has north-pole on its outer diameter and south-pole on inner diameter, while the other pair is it's complementary. The magnets were mounted with opposite poles together on the magnet holder with an axial moving shaft having a piston mounted on both ends of the shaft. The shaft movement was restricted to the axial direction by using C-clamp type flexures, mounted on both sides of the shaft. The force requirement for driving the compressor was calculated based on which the electrical circuit of motor is designed by proper selection of wire gauge and Ampere-turns. The flexure spring force estimation was done through simulation using ANSYS 11.0 and was verified experimentally; while the magnet spring force was determined experimentally. The motor with mounted piston was tested using a variable voltage and variable frequency power supply capable of driving 140 watts of load.

Item Type:	Conference Proceedings
Series.:	AIP Conference Proceedings
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Keywords:	Linear Motor; Moving Magnet; Cryocooler; Flexures; PWM Power Drive; Twin Pulse Tube
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology
Date Deposited:	04 Mar 2013 08:54
Last Modified:	05 Mar 2013 06:59
URI:	http://eprints.iisc.ac.in/id/eprint/45409

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