Spacecraft Mechanisms

Ultra Fine Angle Rotary Incremental Actuators

The Moog Type 3-EF and Type 5-EF Rotary Incremental Actuators are new additions to our rotary actuator product line. The designed is based on a recently developed extra fine step angle permanent magnet stepper motor which in combination with the standard harmonic drive gear reducers produces extra fine output step resolution. All of the electrical elements, such as motors and position sensors, can be redundant with little or no change in actuator envelope. The new line of actuators offer:

Quiet operation
Low weight
Zero-backlash
High output torsional stiffness

Specifications
	Type 3-EF	Type 5-EF
Output Step Angle	0.0015	0.001
Steps Per Revolution	240,000	360,000
Transmission Ratio	160:1	200:1
Motor Step Angle (degree)	0.24	0.2
Max. Output Step Rate (pulses/sec)	1000	800
Max. Output Speed (deg/sec)	1.5	0.8
Running Torque (lb-in)	250	325
Un-powered Holding Torque (lb-in)	80	100