Micro3 Rotary Incremental Actuator

The Micro3 rotary incremental actuator is a compact, closely integrated design made up of two key elements: a rotary actuator and a standard Type 3 speed reducer and output flange. The motor is a small angle permanent magnet stepper with relatively high holding torque. The multi-stage speed reducer offers a large reduction ratio, low weight, low power consumption, zero backlash and high torsional stiffness. Co-axial nesting of the motor and transmission drive elements gives the unit low profile geometry. The actuator can be made available in two and three phase motors and has the identical mounting features of the Moog standard Type3 line of Rotary Actuators.



Key Features:

  • Multi-stage speed reducer offers a large reduction ratio and fine resolution
  • Low weight
  • Low power consumption
  • Zero backlash
  • Low jitter
  • High torsional stiffness


Characteristic  Units      1        2        3         

Output Step Size

Degree 0.00094 0.0015 0.003
Steps Per Revolution - 384000 240000 120000
Gear Reduction Ratio - 16000 5000 2500
Motor Step Angle Degree 15 7.5 7.5
Maximum Output Step Rate pps 640 600 600
Maximum Output Speed Deg/Sec 0.6 0.9 1.8
Output Running Torque Nm 90 28 14
Unpowered Holding Torque Nm 120 38 20
Torsional Stiffness Nm/Rad 17000 17000 17000
Power Consumption Watts 3 watts at ambient 3 watts at ambient 3 watts at ambient

Load Capability

Characteristic  Units       


N 9800
Transverse N 6670
Moment Nm 325
Total Assembly Weight Grams 1600


Characteristic  Units       

Temperature Range

C -45 to +85
Vibration Level Grams 26

Related Markets


Moog has designed and manufactured components and systems for satellites and launch vehicles for more than 60 years.

Spacecraft Technologies

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.