Satellites and subsystems > Attitude > Attitude actuators > Reaction wheels > LIBRA-6 Reaction Wheel
Key highlights
A high-performance alternative to a propulsion-based reaction control system, reaction wheels provide spacecraft with control torque by means of momentum exchange between the satellite body and the rotating wheel.
The increasing popularity of these wheels coupled with our commitment to high-quality, fit-for-purpose components has resulted in NSS offering these wheels in a range of standard sizes (NRWA-T065, NRWA-T2, NRWA-T6, and NRWA-T25) or can offer a customized flywheel for mission optimization.
Applications
- High-performance three-axis torque and momentum exchange actuators for agile small satellite missions
- Momentum bias
- Inertial rate control for accurate pointing of imagers
Key features
- Wheel torque and momentum capacity suited to client mission requirements
- Current, speed and Torque control
- Simple digital interface to the spacecraft bus
- Integration with an optional gyroscope for inertial rate control and inertial angle control modes is possible on T065
- Hermetically sealed (T065 & T2)
- Long demonstrated lifetimes
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Last updated: 2025-08-12
LIBRA-6 Reaction Wheel
Technical specs
data interface
Redundant RS-485 (Full Duplex). 460800 baud/s. Up to 4 units sharing data bus.
power consumption
139.6 W (Peak power consumption)
29.3 W (Steady state at 6 Nms)
15.3 W (Steady state at 3 Nms)
5.1 W (Quiescent)
29.3 W (Steady state at 6 Nms)
15.3 W (Steady state at 3 Nms)
5.1 W (Quiescent)
Power supply
28 V (unregulated)
radiation tolerance
30 kRad (component level)
mechanical vibration
14 Grms (random)
Thermal (acceptance)
-30 to 55 C
mass
4.7 kg
width
210 mm (wheel)
height
210 mm (wheel)
length
100 mm (wheel)
Nominal Torque
150 mN m
Peak torque
300 mNm (peak)
maximum momentum storage
7.83 Nms (at 5000 rpm)
7.83 Nms @ 5000 RPM (Peak)
7.83 Nms @ 5000 RPM (Peak)
rotor moment of inertia
0.0149 kg m^2
speed control accuracy
±1 RPM @ >10 RPM
±0.14 RPM @ > 100 RPM
±0.14 RPM @ > 100 RPM
angular momentum storage
6 Nms @ 3845 RPM (Nominal)
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