The Moog M8 rotary incremental actuator is a compact, closely integrated design made up of two key elements: a motor, and a harmonic drive speed reducer. The motor is a small angle permanent magnet stepper with a relatively high holding torque. The harmonic drive speed reducer offers a large reduction ratio, high load capability, low weight, zero backlash and relatively high torsional stiffness. Coaxial nesting of the motor and harmonic drive elements allows use of larger and higher capacity output bearings and gives the unit a low-profile geometry.
Moog is a proven leader in components, subsystems, and systems for spacecraft of all sizes, from smallsats to GEO spacecraft. Moog has been successfully providing spacecraft controls, inspace propulsion, and major subsystems for science, military, and commercial operations for more than 60 years.