Solid state engine using nitinol memory alloy

Details Solid state engine using nitinol memory alloy Solid state engine using nitinol memory alloy

1980-01-21

1981-12-01

Ostrager, Allen M.

Power plants

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

Mass is a solid

F03G 706

Patent

active

043029396

ABSTRACT:
A device for converting heat energy to mechanical energy includes a reservoir of a hot fluid and a rotor assembly mounted thereabove so a portion of it dips into the hot fluid. The rotor assembly may include a shaft having four spokes extending radially outwardly therefrom at right angles to each other, a floating ring and four flexible elements composed of a thermal memory material having a critical temperature between the temperature of the hot fluid and that of the ambient atmosphere extending between the ends of the spokes and the floating ring. Preferably, the flexible elements are attached to the floating ring through curved leaf springs. Energetic shape recovery of the flexible elements in the hot fluid causes the rotor assembly to rotate.

REFERENCES:
patent: 3665705 (1972-05-01), Christensen
patent: 3830060 (1974-08-01), Jedlicka et al.
Golestaneh, "Efficiency of the Solid-State Engine made with Nitinol Memory Material", Journal Applied Physics, 49(3), Mar. 1978.
Wang and Buehler, "Additional Unique Property Changes Observed During TiNi Transition", Applied Physics Letter, vol. 21, No. 3, Aug. 1972.

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