A study on the linear compressor characteristics of the Stirling cryocooler

Koh, Deuk‐Yong; Hong, Yong-Ju; Park, Seong-Je; Kim, Hyo-Bong; Lee, Kwan-Soo

doi:10.1016/s0011-2275(02)00064-4

Cited by 38 publications

(7 citation statements)

References 4 publications

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“…1 , ' 2 , ' a , and ' p are the distances from centre of mass (COM), G, to the AMB at the left-hand side (LHS) of the rod, the AMB at the right-hand side (RHS) of the rod, and the location exerted by the linear actuator and the piston, respectively; and H is the axial length of the piston. As the lateral displacement of the piston can be represented by the displacement of COM of the rod, the side-thrust force can also be evaluated by equation (24). For the AMB sets, the actual magnetic force, in practice, is highly non-linear due to saturation, hysteresis, fringing effect, etc.…”

Section: Dynamic Modelling Of a Magnetically Levitated Linear Compressormentioning

confidence: 99%

“…In other words, in order to regulate the lateral position of the mover, a certain amount of electric energy has to be consumed in radial AMBs. As for the axial motion of the drive rod, in order to resist the inertial force of the highfrequency mover, the linear compressor is usually equipped with mechanical springs [23,24]. In other words, due to the additional mechanical constraint by springs, the high frequency and variable frequency drive for the linear compressor can barely be achieved.…”

Section: Introductionmentioning

confidence: 99%

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Innovative linear compressor by magnetic drive and control

Tsai

Chiang

2011

Proceedings of the Institution of Mechanical Engineers, Part I:

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A mathematical model for the magnetically levitated linear compressor (MLLC), which consists of a magnetic linear actuator, a pair of active magnetic bearings (AMBs), and a drive rod, has been developed. To prevent any potential wear or collision by the drive rod against conventional bearings, and certainly to reduce noise, the AMB pair is employed to regulate the lateral position deviation of the drive rod. The integral sliding mode control (ISMC) is synthesized to account for displacement-dependent system parameters and input non-linearities for the MLLC system. In addition, the closed-loop stability, under the presence of the reaction force by gas in the chamber, is proven by the Lyapunov direct method. Finally, the efficacy of the ISMC is verified by intensive computer simulations to ensure its superior regulation capability for lateral position deviation on the drive rod, retention of constant stroke of the piston, and counterbalance against the reaction force by gas during the Otto cycle.

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Section: Dynamic Modelling Of a Magnetically Levitated Linear Compressormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Innovative linear compressor by magnetic drive and control

Tsai

Chiang

2011

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…The gasodynamic interaction of the piston and the cylinder head, in a simplistic approach, is represented as a parallel spring-dashpot combination , K C . The equations of motion [4][5][6][7][8] in the linear approximation describe the dynamics of the linear motor…”

Section: Theoretical Analysismentioning

confidence: 99%

Microminiature linear split Stirling cryogenic cooler for portable infrared imagers

Veprik¹,

Vilenchik²,

Riabzev³

et al. 2007

SPIE Proceedings

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Novel tactics employed in carrying out military and antiterrorist operations call for the development of a new generation of warfare, among which sophisticated portable infrared (IR) imagers for surveillance, reconnaissance, targeting and navigation play an important role. The superior performance of such imagers relies on novel optronic technologies and maintaining the infrared focal plane arrays at cryogenic temperatures using closed cycle refrigerators. Traditionally, rotary driven Stirling cryogenic engines are used for this purpose. As compared to their military off-theshelf linear rivals, they are lighter, more compact and normally consume less electrical power. Latest technological advances in industrial development of high-temperature (100K) infrared detectors initialized R&D activity towards developing microminiature cryogenic coolers, both of rotary and linear types. On this occasion, split linearly driven cryogenic coolers appear to be more suitable for the above applications. Their known advantages include flexibility in the system design, inherently longer life time, low vibration export and superior aural stealth. Moreover, recent progress in designing highly efficient "moving magnet" resonant linear drives and driving electronics enable further essential reduction of the cooler size, weight and power consumption. The authors report on the development and project status of a novel Ricor model K527 microminiature split Stirling linear cryogenic cooler designed especially for the portable infrared imagers.

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“…Liu et al analyzed several different gas spring formula of the linear compressor and presented a new accuracy formula [6]. Koh et al analyzed the movement of the linear compressor for Stirling cryocooler [7]. The results showed that the operating frequency of the linear compressor had significant effect on the input characteristics and the compressor with higher charging pressure of working fluid has high pressure ratio.…”

Section: Introductionmentioning

confidence: 99%

Study on magnetic circuit of moving magnet linear compressor

Xia

Chen

2015

SPIE Proceedings

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The moving magnet linear compressors are very popular in the tactical miniature stirling cryocoolers. The magnetic circuit of LFC3600 moving magnet linear compressor, manufactured by Kunming institute of Physics, was studied in this study. Three methods of the analysis theory, numerical calculation and experiment study were applied in the analysis process. The calculated formula of magnetic reluctance and magnetomotive force were given in theoretical analysis model. The magnetic flux density and magnetic flux line were analyzed in numerical analysis model. A testing method was designed to test the magnetic flux density of the linear compressor. When the piston of the motor was in the equilibrium position, the value of the magnetic flux density was at the maximum of 0.27T. The results were almost equal to the ones from numerical analysis.

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A study on the linear compressor characteristics of the Stirling cryocooler

Cited by 38 publications

References 4 publications

Innovative linear compressor by magnetic drive and control

Innovative linear compressor by magnetic drive and control

Microminiature linear split Stirling cryogenic cooler for portable infrared imagers

Study on magnetic circuit of moving magnet linear compressor

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