Shape memory bi-directional rotary actuator

Details Shape memory bi-directional rotary actuator Shape memory bi-directional rotary actuator

1991-02-07

1992-07-07

Ostrager, Allen M.

Power plants

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

Mass is a solid

60528, F03G 706

Patent

active

051272288

ABSTRACT:
A shape memory actuator capable of high torque densities capable of being used on space applications and other fields. The actuator is made of two concentric tubular shape memory alloy (SMA) members (12 and 14) torsioned along their longitudinal axis with ends constrained relative to each other. One end of the actuator is constrained while the other is the output. A heater (16) is located inside the inner SMA member (12). A heater (18) is located on the outside of the outer SMA member (14). The unconstrained end is caused to rotate between positions by applying current to the appropriate heater.

REFERENCES:
patent: 4010455 (1977-03-01), Strange
patent: 4700541 (1987-10-01), Gabriel
patent: 4887430 (1989-12-01), Kroll
"Passive Sun Seeker/Tracker and Thermally Activated Power Module" Seibert and Morris.
"Shape Memory Alloy Actuator Drive Rotary Actuator" Design News, Feb. 1990.
"Special Alloy is Key to Braille Computer Display" Design News, Feb. 1990.

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