Piston position sensing and control in a linear compressor using a search coil

Liang, Kun, Stone, Richard, Dadd, Mike and Bailey, Paul (2016) Piston position sensing and control in a linear compressor using a search coil. International Journal of Refrigeration, 66. pp. 32-40. ISSN 0140-7007

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Abstract

Linear compressors with clearance seals are well established for cryocoolers using either a Stirling cycle or pulse tube. However, both piston stroke and piston offset require detection and control in valved compressors. In order to manufacture linear compressor in large scale, then a simple, robust, and cheap control system is required with a minimum of sensors and actuators. This work introduces an approach to sensing the position of the piston using a search coil. The piston stroke is detected by calculating the peak-to-peak flux linkage in relation to the measured drive voltage and current. The piston offset is proportional to an integrated modulus of the back electromotive force (emf) of the search coil. Two PID (proportional-integral-derivative) controllers were developed to control the piston stroke by adjusting the drive voltage and a solenoid valve and bleed flow to control the piston offset. Experimental results validate the proposed compressor control technique.

Item Type: Article
Keywords: Linear compressor; Control system; Search coil; Piston stroke; Piston offset
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Kun Liang
Date Deposited: 17 Oct 2016 11:42
Last Modified: 08 Mar 2017 07:40
URI: http://sro.sussex.ac.uk/id/eprint/64792

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