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US 4,306,419 AGranted
Brushless DC motor driven cryogenic refrigeration system
AssigneeAeroflex Laboratories, Inc.
InventorMyron Schwartz
Life of this patent
Estimating the term…
Abstract
A portable cryogenic helium-filled refrigeration system includes a cold finger evaporator, a compressor connected to the cold finger, a brushless DC motor connected to drive the compressor, and an electronic circuit for switching the stator-armature winding currents of the motor. The motor and compressor and the electronic circuit are all enclosed within a common housing which is charged with helium gas refrigerant under pressure.
Claims4
In combination, a portable cryogenic refrigeration system comprising a helium-filled refrigerant system including
- a cold finger arranged to be immersed in a container to be refrigerated,
- a compressor connected through a refrigerant line to said cold finger for compressing the helium,
- a brushless DC motor connected to drive said compressor,
- said motor and said compressor being housed in a common housing,
- an electronic circuit for switching the stator-armature winding currents of said motor in synchronism with the rotation of the motor rotor,
- said electronic circuit being enclosed within said common housing,
- and the entire interior of said common housing being charged with helium.
4 more elements
Dependencies are inferred from the claim text.