Electric Rotary Motion Actuator Feasibility Study

1The feasibility of high specific torque rotary electric actuators with mechanical lockout capability is investigated for replacement of medium to high pressure hydraulic devices currently used to operate, stow, or extend combat vehicle appendages. The feasibility study is directed toward an illustrative application requiring 12,000 lb. in torque capacity, 180 degrees of rotation, weight under 50 lb. and a body diameter less than 8 in. The design includes an electronic power inverter and microcomputer controller. A preferred concept employs a high tractive force density permanent magnet electric motor, optimized for short duty-cycle service, which is coupled to harmonic drive torque multiplier. The package design is pressure balanced to permit seawater submerged operation at various depths.