Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Patent
1988-05-19
1991-06-11
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
318138, 318254, 318472, H02P 602, G05D 2300
Patent
active
050235311
ABSTRACT:
A refrigeration control apparatus especially adapted for use in conjunction with cryogenic coolers includes a brushless variable speed drive motor for powering a mechanical cooler-compressor and electronic control circuitry coupled to the motor allowing motor speed and hence cooling rate to be responsive to changes in the temperature of the volume sought to be cooled. A signal corresponding to sensed temperature is compared to a reference signal derived from motor speed. The difference therebetween used to vary the duty cycle of a high frequency pulse train. The pulse train is used to modulate the drive current applied to the motor through pulse position switching circuitry to vary the speed of the drive motor. High and low motor speed limits are provided along with sensor failure protection circuitry to insure continuous motor operation between chosen limits.
REFERENCES:
patent: 3584280 (1971-06-01), Inagaki
patent: 3988652 (1976-10-01), Endo et al.
patent: 4015182 (1977-03-01), Erdman
patent: 4418303 (1983-11-01), Abe et al.
patent: 4472666 (1984-09-01), Akeda et al.
patent: 4510422 (1985-04-01), Ogura
patent: 4544868 (1985-10-01), Murty
patent: 4595865 (1986-06-01), Jahns
patent: 4667480 (1987-05-01), Bessler
patent: 4686437 (1987-08-01), Langley et al.
patent: 4694228 (1987-09-01), Michaelis
patent: 4720663 (1988-01-01), Welch et al.
patent: 4734628 (1988-03-01), Bench et al.
patent: 4763052 (1988-08-01), Lundin et al.
patent: 4856078 (1989-08-01), Konopka
Altemose George A.
Consi Michael
Giguere David B.
Gully Wilfred J.
Joscelyn Edwin R.
Arx, Inc.
Ro Bentsu
LandOfFree
Dual hybrid demand refrigeration control apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dual hybrid demand refrigeration control apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual hybrid demand refrigeration control apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-784755