Method and apparatus for controlling the movement of a free, gas

Details Method and apparatus for controlling the movement of a free, gas Method and apparatus for controlling the movement of a free, gas

1990-11-21

1992-03-03

Ostrager, Allen M.

Power plants

Motor operated by expansion and/or contraction of a unit of...

Unit of mass is a gas which is heated or cooled in one of a...

F02G 106

Patent

active

050921193

ABSTRACT:
A method and apparatus for controlling the reciprocal movement of a free, gas-driven displaced in a cooling engine are disclosed. Mechanical stops in the form of a crank mechanism prevent axial overshooting of the gas-driven displacer in each direction. A uni-directional magnetic "detent" is established for the displacer at predetermined location beyond the top dead center and bottom dead center portions of the cooling cycle. Each uni-directional magnetic "detent" provides a magnetic retention force to hold the displacer from moving until a pre-determined pressure differential is established across the displacer's drive piston. The magnetic "detents" are formed by magnetic elements that operate in cooperation with the crank mechanism. The magnetic retention forces can be made equal or unequal in magnitude through the selection of permanent magnet(s) or core configuration(s) or by controlling the field strength of electro-magnets or by varying the position of the magnets with respect to the TDC and BDC positions of the crank mechanism.

REFERENCES:
patent: 4567726 (1986-02-01), Vitale et al.
patent: 4792346 (1988-12-01), Sarcia

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