Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1996-06-21
1997-10-21
Capossel, Ronald C.
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
244158R, F25B 900
Patent
active
056784090
ABSTRACT:
A three state EM motor/damper used in a ground-based or space-based Stirling refrigerator expander mechanism provides multiple states of operation to obtain fail safe performance during assembly, launch (space based refrigerators), and operation. The device is attached to the expander's reciprocating displacer to enable actuation during assembly, provide maximum damping during launch, and provide attenuated damping to control displacer motion during operation as a refrigerator. The motor/damper is a linearly actuated "voice coil" device employing a moving coil wound on an electrically conductive bobbin and oscillating within a permanent magnet/back iron field assembly. The electrically conductive bobbin internally generates and dissipates eddy currents when moved through the magnetic field. The bobbin acts as a coil of one turn, shorted to itself. This mechanism transforms kinetic energy to electrical energy, which then dissipates as heat. In this manner, mechanical energy is removed from the system. Operational states are obtained by switching the coil terminals at a multi-pole relay that alternately connects a voltage supply, a dead short, or a short through a ballast resistor. In the event of a switch open failure, fail safe performance during launch and operation is provided by the fixed, intrinsic damping of the coil bobbin.
REFERENCES:
patent: 5088288 (1992-02-01), Katagishi et al.
patent: 5385021 (1995-01-01), Beale
patent: 5412951 (1995-05-01), Wu
patent: 5502968 (1996-04-01), Beale
patent: 5582013 (1996-12-01), Neufeld
"Advances in Cryogenic Engineering", Proceedings of the Cryogenic Engineering Conference, vol. 35, Part B, 1989, pp. 1423-1430.
Capossel Ronald C.
Denso-Low Wanda K.
Hughes Electronics
Lindeen III Gordon R.
Sales Michael W.
LandOfFree
Passive three state electromagnetic motor/damper for controlling does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Passive three state electromagnetic motor/damper for controlling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passive three state electromagnetic motor/damper for controlling will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-998114