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Piston position sensing and control in a linear compressor using a search coil
journal contribution
posted on 2023-06-09, 03:32 authored by Kun LiangKun Liang, Richard Stone, Mike Dadd, Paul BaileyLinear 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.
History
Publication status
- Published
File Version
- Published version
Journal
International Journal of RefrigerationISSN
0140-7007Publisher
ElsevierExternal DOI
Volume
66Page range
32-40Department affiliated with
- Engineering and Design Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2016-10-17First Compliant Deposit (FCD) Date
2016-10-17Usage metrics
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