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

1990-03-14

1991-09-17

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...

62 6, F02G 1045, F25B 900

Patent

active

050482971

ABSTRACT:
A method and apparatus for controlling the reciprocal movement of a free piston, gas-driven displacer in a cooling engine are disclosed. A bi-directional magnetic "detent" is established for the displacer at both the top dead center and bottom dead center portions of the cooling cycle. Each bi-directional magnetic "detent" provides a magnetic snubbing force to limit overshooting of the displacer in one direction and a magnetic retention force to hold the displacer from moving in the other direction until a pre-determined pressure differential is established across the displacer's drive piston. The magnetic "detents" are formed by means of a three pole double magnet with a single core or alternatively, by a two pole single magnet with a double core. The magnetic snubbing and retention forces can be made equal or unequal in magnitude either through the selection of permanent magnet(s) or core configuration(s) or by controlling the field strength of electro-magnets.

REFERENCES:
patent: 3991586 (1976-11-01), Accord
patent: 4397155 (1983-08-01), Davey
patent: 4792346 (1988-12-01), Sarcia

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