Shape memory alloy rotary actuator

Details Shape memory alloy rotary actuator Shape memory alloy rotary actuator

1989-08-09

1990-10-23

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

60527, H01H 7118, H01H 6106

Patent

active

049655450

ABSTRACT:
A rotary actuator which provides a differential pulley pair having a shape memory alloy wire. The shape memory alloy wire is thermally cycled through its phase change transition temperature and contracts. Tension forces applied by the ends of the wires to opposite sides of the pulley pair result in a net torque which causes relative rotation between the pulley pair and a reference base. The large mechanical advantage of the differential pulley converts a large force working through a small distance into a relatively large angular rotation.

REFERENCES:
patent: 4246754 (1981-01-01), Wayman
patent: 4544988 (1985-10-01), Hochstein

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