Type 3 Rotary Incremental Actuator
The Type 3 actuator is one of our more popular designs, with hundreds of units delivered and successfully operating in space. The standard design is based on the Moog heritage actuator concept, a compact coaxially nested motor and harmonic drive gear system. The most popular version incorporates a potentiometer for position sensing with a redundant three phase motor. As with all Moog actuator products, incorporating optional equipment based on the application is possible. This flexible design can accommodate hard stops, 2 or 3 phase stepper motors, brushless DC motors, a variety of position sensors, cable management systems or other application-specific options. These actuators are commonly used in Antenna Pointing Mechanism applications. The actuators can be incorporated into a biaxial gimbal configuration to fit any application. Contact Moog application engineers for assistance with actuator selection and design options.
Key Features:
- Compact coaxially nested motor and harmonic drive provides fine resolution
- Can accommodate 2 and 3 phase motors
- Low weight
- Zero backlash
- Optimized for low power consumption
- Small angle permanent magnet stepper provides relatively high holding and running torque
Specifications
| Parameter | Units | Basis | Data |
Output Step Angle | Degrees | Standard | 0.009375 |
| Steps/Revolution | - | Standard | 38,400 |
| Harmonic Drive ratio | - | Standard | 160:1 |
| Motor Step Angle | Degrees | Standard | 1.5 |
| Max. Output Step Rate | Step/Sec (Deg/Sec) | Maximum | 350 (3.28) |
| Torsional Stiffness | lb-in/rad | Typical | 140,000 |
| N-m/rad | Typical | 15,800 | |
| Shaft Load Capability Axial | lb | Maximum | 2,500 |
| N | Maximum | 11,000 | |
| Traverse Load Capability | lb | Maximum | 2,100 |
| N | Maximum | 9,400 | |
| Moment Load Capability | lb-in | Maximum | 1800 |
| N-m | Maximum | 203 | |
| Moment Stiffness | lb-in/rad | Typical | 370,000 |
| Power | Watts | Typical | 14 |
| Inertial Capability | Kg-m2 | Typical | 35 |
| High | 100 | ||
| Output Torque | lb-in | Typical | 350 |
| N-m | Typical | 39.5 | |
| Holding Torque: Powered | lb-in | Typical | 500 |
| Typical | 56.5 | ||
| Holding Torque: Unpowered | lb-in | Typical | 300 |
| N-m | Typical | 33.9 | |
| Total Assembly Weight (with potentiometer) | lb | Typical | 4.2 |
| kg | Typical | 2 |
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Space
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.