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US 4,902,952 AGranted
Cooling apparatus
AssigneeBritish Aerospace Public Limited Company
InventorBrendan Lavery
Life of this patent
Estimating the term…
Abstract
A Stirling cycle cooling engine with separate linear motor drives for the compressor and displacer, the drives being powered by a common oscillator via respective look up table/digital to analog converter circuits and respective displacement regulating servo-loop circuits and to regulate the temperature of the element cooled by the engine, a temperature sensor arranged to control the amplitude of the compressor piston displacement.
Claims6
A Stirling Cycle cooling engine comprising:
- electromagnetic drive means for electromagnetically driving a compressor for generating pressure variations in a working fluid of a cold finger assembly and for electromagnetically driving a cold finger displacer;
- and
- means for energizing the electromagnetic drive means for the compressor and cold finger displacer, comprising a common oscillator, two digital memories arranged to be addressed in dependence upon an output of the oscillator and each storing respective output waveform sample look-up tables, two digital-to-analog converters for converting respective outputs of said digital memories to analog waveforms, and two servo loop circuits for receiving respective ones of said analog waveforms and forming respective energization signals for the electromagnetic drive means based thereon.
Dependencies are inferred from the claim text.