Model 971 Rotary Actuator
Moog Space Defense Group
The Moog Model 971 Rotary Servo Actuator is a military-qualified, brushless, stepper motor designed for limited rotation trim actuation in military helicopters.
Key figurescomparable across the catalogue
- Mass
- 1.45 kg
- Largest dimension
- 166.62 mm
Normalised to common units so this product can be compared with others in its category. The supplier's own wording is below.
As published by the supplier
- Size
- 3.0 x 3.48 x 6.56 inches
- Weight
- 3.2 lbs Actuator Only
- Power
- 28 VDC
- Holding torque
- 200 in-lbs
- Command
- four phase stepper motor control from an external amplifier
- Stroke
- ±30°
- Step rate
- 1 rpm
- Step size
- 0.1°
- Load rate
- 15 in-lbs @ 0.6 rpm
- Backlash
- 0.15°
- MTBF
- 5000 hrs
About
The Moog Model 971 Rotary Servo Actuator is a military-qualified, brushless, stepper motor. This limited rotation trim actuator is specifically designed for use in military helicopters. It features a compact size of 3.0 x 3.48 x 6.56 inches and weighs 3.2 lbs (actuator only). The actuator operates on 28 VDC power and has a holding torque of 200 in-lbs. It is controlled by a four-phase stepper motor from an external amplifier, offering a stroke of ±30° with a step size of 0.1° and a step rate of 1 rpm. The Model 971 also includes an eddy current damper and has a backlash of 0.15°. With a rated load torque of 15 in-lbs at 0.6 rpm and a stall torque of 200 in-lbs, it boasts an MTBF of 5000 hours. For specific application tailoring, Moog’s applications engineers are available for consultation.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.