Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1991-05-24
1992-10-20
Wayner, William E.
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
318811, 417 45, F25B 900, H02P 100
Patent
active
051560054
ABSTRACT:
The displacement of a Stirling cycle cryocooler is controlled as a function of temperature by controlling the amplitude of the fundamental component of an AC signal which is applied to the motor at its operating frequency. A pulse train is generated, having a frequency which is a harmonic of the operating frequency. The duty cycle of the pulse train is modulated between 50% and 100% as a function of the temperature. The modulated pulse train is applied to the motor during one-half of the load's operating period and the complement of the pulse train is applied to the load during the other half of its operating period. Modulating the duty cycle of the pulse train (and consequently simultaneously of its complement) as a function of temperature variably controls the amplitude of the fundamental component of the drive voltage and therefore variably controls the displacement of the motor and, as a consequence, of the cryocooler piston.
REFERENCES:
patent: 4417448 (1983-11-01), Horn et al.
patent: 4620143 (1986-10-01), Matty
patent: 4628475 (1986-12-01), Azusawa et al.
Foster Frank H.
Sunpower, Inc.
Wayner William E.
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