SSTL GEO Wheel (SSW-200)
SSTL (Surrey Satellite Technology)
Geostationary-orbit reaction wheel with 15 year design life, qualified with Airbus Defence and Space and ESA.
Technical specifications
- Model code
- SSW-200-OGS-12000
- Reaction torque
- 200 mNm to +/-3900 rpm at 48.5 V DC
- Momentum
- 12 Nms @ +/-5000 rpm
- Speed range
- +/-5000 rpm
- Lifetime (orbit)
- 15.25 years
- Environment
- Designed for Geostationary Orbit
- Vibration (qualification)
- 15 Grms X/Y, 16 Grms Z
- Thermal (qualification)
- -35 to +70 degC survival, -30 to +60 degC operating
- Electrical interface
- Single male socket (D-type), 25 way
- Nominal regulated voltage
- 48.5 to 52.5 V DC (full performance), 23.5 V DC min (reduced performance)
- Idle power consumption
- <5 Watts
- Maximum power consumption
- <180 Watts
- Wheel volume
- Diameter 240 x 95 mm
- Mass
- <5.6 kg
- Communications
- RS485
About
The SSTL GEO Wheel was designed, developed and qualified in 2018 by SSTL under contract with prime contractor Airbus Defence and Space (ADS), with reviews held jointly with ADS and the European Space Agency. The first GEO flight wheels were launched in July 2021 on Eutelsat Quantum. It offers a 15-year design life in GEO orbit, fully integrated radiation-hard electronics, a hermetically sealed mechanism, both current and speed control modes, chassis or harness grounding, regenerated power return to the spacecraft bus, electrically isolated ON/OFF switching and RS485 communications.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.
