Satellites and subsystems > Attitude > Attitude actuators > Reaction wheels > LIBRA-25 Reaction Wheel
Key highlights
A high-performance alternative to a propulsion-based reaction control system, the NRWA-T025 reaction wheel provides spacecraft with control torque by means of momentum exchange between the satellite body and the rotating wheel.
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Last updated: 2025-08-12
LIBRA-25 Reaction Wheel
Technical specs
peak torque
175 mNm (Peak)
power supply
28 V (unregulated)
data interface
Redundant RS-485 (Full Duplex). 460800 baud. Up to 4 units sharing data bus.
radiation tolerance
30 krad
mechanical vibration
20 Grms (random)
operating temperature
-30 to 55 C
mass
12 kg
height
120 mm
width
350 mm
length
350 mm
rotor moment of inertia
46.7e-3 kg m^2
maximum momentum storage
30 Nms @ 6000 RPM (Peak @ 28V)
angular momentum storage
25 Nms @ 5000 RPM (Nominal @ 28V)
nominal torque
90 mNm (Nominal)
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