Satellites and subsystems > Attitude > Attitude actuators > Reaction wheels > LIBRA-2 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-2 Reaction Wheel
Technical specs
mass
2.8 kg
width
150 mm (wheel)
height
150 mm (wheel)
length
70 mm (wheel)
nominal torque
84 mN m
peak torque
90 mN m
angular momentum storage
1 Nms @ 1850 RPM (Nominal)
maximum momentum storage
1.47 Nms @ 2700 RPM (Peak)
rotor moment of inertia
0.0052 kg m^2
speed control accuracy
±1 RPM @ >100 RPM
power consumption
1.7 W (quiescent)
4 W (steady state at 1500 rpm)
4.8 W (steady state at 2600 rpm)
4 W (steady state at 1500 rpm)
4.8 W (steady state at 2600 rpm)
thermal (acceptance)
-10 to 55 C
power supply
28 V unregulated
data interface
RS422
connector type
9-pin D-type Male
mechanical vibration
16.95 gRMS (random)
radiation tolerance
10 krad (component level)
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