Flexure bearing compressor in the one watt linear (OWL) envelope

Rühlich, I.; Mai, Markus; Wiedmann, Th.; Rosenhagen, C.

doi:10.1117/12.722111

Cited by 14 publications

(10 citation statements)

References 4 publications

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“…The springs of the damping system are flexure bearings. The design is similar to AIMs Flexure Bearing compressor springs [1], [10]. The small outer diameter of the compressor (less than 28mm) leads to low possible stroke of the flexures.…”

Section: Compressor Designmentioning

confidence: 99%

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AIM cryocooler developments for HOT detectors

et al. 2014

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Significantly increased FPA temperatures for both Mid Wave and Long Wave IR detectors, i.e. HOT detectors, which have been developed in recent years are now leaving the development phase and are entering real application. HOT detectors allowing to push size weight and power (SWaP) of Integrated Detectors Cooler Assemblies (IDCA's) to a new level. Key component mainly driving achievable weight, volume and power consumption is the cryocooler. AIM cryocooler developments are focused on compact, lightweight linear cryocoolers driven by compact and high efficient digital cooler drive electronics (DCE) to also achieve highest MTTF targets. This technology is using moving magnet driving mechanisms and dual or single piston compressors. Whereas SX030 which was presented at SPIE in 2012 consuming less 3 W DC to operate a typical IDCA at 140K, next smaller cooler SX020 is designed to provide sufficient cooling power at detector temperature above 160K. The cooler weight of less than 200g and a total compressor length of 60mm makes it an ideal solution for all applications with limited weight and power budget, like in handheld applications. For operating a typical 640x512, 15µm MW IR detector the power consumption will be less than 1.5W DC . MTTF for the cooler will be in excess of 30,000h and thus achieving low maintenance cost also in 24/7 applications. The SX020 compressor is based on a single piston design with integrated passive balancer in a new design achieves very low exported vibration in the order of 100mN in the compressor axis. AIM is using a modular approach, allowing the chose between 5 different compressor types for one common Stirling expander. The 6mm expander with a total length of 74mm is now available in a new design that fits into standard dewar bores originally designed for rotary coolers. Also available is a 9mm coldfinger in both versions. In development is an ultra-short expander with around 35mm total length to achieve highest compactness. Technical solutions and key performance data for AIM's HOT cryocoolers will be presented.

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Section: Compressor Designmentioning

confidence: 99%

“…Linear cryocoolers with a maximum input power of 60W have been common. At this time AIM has developed SF100 long life cryocooler using flexure bearings and for a first time moving magnets instead of moving coils [10]. This cooler was designed to meet the OWL specification.…”

Section: Introductionmentioning

confidence: 99%

AIM cryocooler developments for HOT detectors

et al. 2014

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“…The early Oxford-type spiral flexure springs mainly adopted three spiral slots [33,[40][41][42]47]. For a flat disc, three spiral slots usually yield three separate spring arms, and thus it is often called as the three-arm (or three-finger) spiral flexure spring, which is the classical Oxford type and has found a wide range of applications in both space-borne and tactical fields [59,61,63,65,67,69]. Later the six-arm flexure spring with the six spiral slots became another typical design afterwards, which was discussed in more detail by Dadd et al [66] and Simcock [70].…”

Section: 322mentioning

confidence: 99%

“…Actually, the crux of the problem is that there exists the great difficulty in analytically describing spring stress versus displacement stroke under the conditions that the displacements also exist at axial direction. Therefore, finite element analysis (FEA) modelling has become a necessary approach to understand the mechanism and design optimization of flexure spring [9][10][11][12]15,16,34,[40][41][42][43][58][59][60][61][62][63][64][65][66][67][68][69][70]. The diameter of a flexure spring plays an important role in determining the stiffness.…”

Section: Parametersmentioning

confidence: 99%

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Dang

2015

Cryogenics

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“…So the moving magnet linear compressor and flexure spring are very good choices with the MTTF nearly up to 20,000h. The LSF95XX compressor of Thales Cryogenics and the SF100A compressor of AEG INFRAROT-MODULE GmbH are this kind of compressor [1,2].…”

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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Flexure bearing compressor in the one watt linear (OWL) envelope

Cited by 14 publications

References 4 publications

AIM cryocooler developments for HOT detectors

AIM cryocooler developments for HOT detectors

Development of high performance moving-coil linear compressors for space Stirling-type pulse tube cryocoolers

Study on magnetic circuit of moving magnet linear compressor

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