Spacecraft Mechanisms

High Torque/Small Angle Rotary Incremental Actuator

Along with the Type M8 and High Gear Ratio M8, the Moog High Torque Type 5 rotary incremental actuator is a new addition to the rotary actuator product line. It is a compact, closely integrated design made up of two key elements: a motor and a multi-stage speed reducer. The motor is the heritage 1.5 degree permanent magnet stepper with relatively high un-powered holding torque. The multi-stage speed reducer, consisting of an input planetary stage and a harmonic drive, offers a large reduction ratio (320:1), low weight, zero backlash and high torsional stiffness. Coaxial nesting of the motor and transmission drive elements give the unit an optimized geometry. All of the electrical elements, such as motors and position sensors, can be redundant with little or no change in actuator envelope.

Specifications

Output Step Angle (degree)
0.00469
Steps Revolution
76,800
Transmission Ratio
320
Motor Step Angle (degree)
1.5
Max. Output Step Rate (pps)
300
Max. Output Speed (deg/sec)
1.40625
Torsional Stiffness
175,000 lb-in/rad (19,770 (Nm/rad)
Shaft Load Capability Axial
3,000 lbf (13,400 N)
Transverse
2,500 ft-lb (11,000 Nm)
Moment
220 ft-lb (298 Nm)
Power Max. (Watts)
17
Inertial Capability
7376 slug-ft2 (10,000 (Kg-m2)
Output Torque
1,200 lb-in (136 Nm)
Unpowered Holding Torque
700 lb-in (79 Nm)
Total Assembly Weight
7.10 lb (3.23 Kg)

Our extensive product offering of Rotary Actuators are flexible and customizable to your specific needs. For more information on Rotary Actuators, or this specific model please contact our Chatsworth facility.