The Bradford Space Reaction Wheel Unit (RWU) W18E comprises of the Wheel Drive Electronics Box (WDE) and a Reaction Wheel Assembly (RWA). The RWA is made up of a rotating inertial mass that is powered by a brushless DC electric motor. The motor's power causes the wheel to accelerate, generating a counter torque that rotates the satellite body in the opposite direction. To enable control around the 3 axes, at least three sets of RWA are required per satellite, with an additional RWA typically included for redundancy.
- Proven performance at low RPMs, with excellent micro-vibrationperformance, verified through lifetest and in-orbit heritage (used in SOHO,RadarSat, Seastar, Olympus, Integral, XMM, Rosetta, Aeolus, and BepiColombo)
- Fixed torque rise time for precise and repeatable control overthe full speed/torque range
- High torque level across the full speed range
- Accurate wheel speed signal
- Available in analogue or digital interface options
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Last updated: 2023-05-22