Apparatus and method for temperature control of a cryocooler by

Details Apparatus and method for temperature control of a cryocooler by Apparatus and method for temperature control of a cryocooler by

1994-08-22

1996-07-16

Wayner, William E.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

622285, F25B 900, F25B 100

Patent

active

055355935

ABSTRACT:
A temperature control apparatus and method for active control of a Stirling-cycle cryocooler cold finger tip temperature, by adjusting the cryocooler compressor piston stroke amplitude. In a control loop of the Stirling cryocooler, having a compressor in which the pistons are reciprocated by linear motors at fundamental frequency and the length of a stroke of the piston is varied as a direct function of cryocooler temperature, temperature is sensed at the cryocooler cold finger tip and the temperature signal is compared with a set temperature signal to produce a temperature error signal. This signal is input in a PID control law module which uses proportional, derivative, and integrated temperature error information to generate the required compressor piston stroke amplitude change for achieving the precision temperature control. The resulting signal is further processed in a distribution law module that distributes the desired piston stoke amplitude change to each compressor motor so that the force balance at the fundamental frequency is maintained.

REFERENCES:
patent: 5156005 (1992-10-01), Redlich
patent: 5167124 (1992-12-01), Lucas
patent: 5245830 (1993-09-01), Aubrun et al.

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