Type M8 Rotary Incremental Actuator
The Moog M8 rotary incremental actuator is a compact, closely integrated design made up of two key elements: a motor, and a harmonic drive speed reducer. The motor is a small angle permanent magnet stepper with a relatively high holding torque. The harmonic drive speed reducer offers a large reduction ratio, high load capability, low weight, zero backlash and relatively high torsional stiffness. Coaxial nesting of the motor and harmonic drive elements allows use of larger and higher capacity output bearings and gives the unit a low-profile geometry.
Key Features:
- Very compact and closely integrated coaxial design
- Relatively high holding torque for its size
- High gear ratio provides fine step resolution
- Low weight
- Zero backlash
Specifications
| Parameter | Units | Basis | Data |
Output Step Angle | Degrees | Standard | 0.050, 0.075 or 0.150 |
| Max. Output Step Rate | Steps/sec | Maximum | 600 |
| Backlash | Degrees | Maximum | Zero |
| Operating Temperature Range | °C | Maximum | -45 to +65 |
| Torsional Stiffness | lb‐in/Rad (Nm/Rad) | Minimum | 3800 (430) |
| Bending Stiffness | lb‐in/Rad (Nm/Rad) | Minimum | 45000 (5084) |
| Axial Stiffness | lb/in (N/m) | Minimum | 250000 (43.9 x 106 ) |
| Radial Stiffness | lb/in (N/m) | Minimum | 130000 (22.8 x 106 ) |
| Output Load Capability Axial | lbf (N) | Nominal | 158 (700) |
| Tranverse | lbf (N) | Nominal | 158 (700) |
| Output Torque | lb‐in (Nm) | Minimum | 25 (2.82) |
| Unpowered Holding Torque | lb‐in (Nm) | Minimum | 14 (1.58) |
| Powered Holding Torque | lb‐in (Nm) | Minimum | 25 (2.82) |
| Power | Watts | Maximum | 20 |
| Total Assembly Weight | lb (Grams) | Maximum | 0.77 (350) |
| Winding Type | Redundant if Required | Redundant if Required | 2 or 3 phase |
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