Spacecraft Mechanisms

Micro3 Rotary Incremental Actuator

Compact, closely integrated design made up of a motor and harmonic drive speed reducer
Motor is a small angle permanent magnet stepper with relatively high holding torque
Co-axial nesting of the motor and harmonic drive elements gives the unit low profile geometry
All electrical elements such as motors and position sensors can be redundant with little or no charge in actuator envelope

Specifications	Units	Basis	Data
Output Step Angle	Degrees	Nominal	0.0009375
Steps / Revolution	-	Standard	384,000
Max. Output Step Rate	Step/sec (Deg/sec)	Maximum	640 (0.6)
Nominal Step Rate for LEO APM Applications	Step/sec (Deg/sec)	Standard	80 (0.075)
Torsional Stiffness	Lb-in/rad (Nm/rad)	Maximum	150,000 (17,000)
Output Torque at Nominal Speed	Lb-in (Nm)	Standard	800 (90)
Holding Torque Unpowered	Lb-in (Nm)	Maximum	>1100 (>120)
Holding Torque Powered	Lb-in (Nm)	Maximum	>1100 (>120)
Power Dissipation	Watts	Nominal	3.0
Total Assembly Weight	Lb (grams)	Nominal	3.40 (1542)

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.