W18ES Reaction Wheel
Bradford Space
High-capacity W18-series reaction wheel variant offering extended momentum storage for demanding pointing missions.
Typed specifications41 values
Discloses 8 of 10 fields engineers filter by in this category (category median 5).
- Mass
- 4 670 g 2-channel WDE · datasheet p.2 6 020 g RWA
- Envelope (L×W×H)
- 258×181×143 2-channel WDE · datasheet p.2 Ø295×125 RWA
- Angular momentum storage
- 25 N·m·s datasheet p.2 25 N·m·s W18ES
- Max torque
- 265 mN·m maximum gross torque · datasheet p.2
- Speed range
- 4 000 rpm max · maximum operational speed · datasheet p.2 4 000 rpm max · Operational
- Supply voltage
- 28 V nom. · datasheet p.2 28 V nom. · 28Vdc bus option | 50 V nom. · 50Vdc bus option | 50 V nom.
- Power consumption
- 29 W steady state at max constant speed · datasheet p.2 168 W Peak at max. torque and speed | 168 W Peak Power Consumption at max. torque and speed | 7.6 W Quiescent | 7.6 W Quiescent Power Consumption +2
- Data interface
- MIL-STD-1553 datasheet p.2 other analogue | MIL-STD-1553 MIL-STD-1553B
- Operating temperature
- -15 °C product page -15–60 °C RWA, qualification | -30–60 °C WDE, qualification
- Wheels in the unit
- 1 datasheet p.2
- Peak power
- 168 W at max. torque and speed · datasheet p.2
- Static imbalance
- 0.5 g·cm datasheet p.2
- Dynamic imbalance
- 5 g·cm² datasheet p.2
- Random vibration
- 10 g RMS RWA, in-plane (qualification) · datasheet p.2 15 g RMS RWA, out-of-plane (qualification) | 11.2 g RMS WDE, in-plane (qualification) | 17.4 g RMS WDE, out-of-plane (qualification)
- Flight heritage
- SOHO, RadarSat, Seastar, Olympus, INTEGRAL, XMM, Rosetta, Aeolus, BepiColombo datasheet p.1
- Quasi-static load
- 400 g min · RWA · datasheet p.2 2 000 g max · RWA
- Shock qualification
- 2 000 g WDE · datasheet p.2 400–2 000 g RWA, depending on balancing requirements
- Drive electronics
- external separate Wheel Drive Electronics box (WDE) · datasheet p.1
- Zero-speed crossing
- yes proven zero crossings and low RPM performance · datasheet p.1
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier16 lines, in the manufacturer's own wording
- Interface
- Analogue or Digital
- Product line
- W-series Reaction Wheel Unit
- Momentum
- 25 Nms
- Maximum Operational Speed
- 4000 RPM
- Number of pulses per revolution
- 240
- RWA Dimensions
- Ø295×125 mm
- Mass
- 6.02 kg
- 2-channel WDE Dimensions
- 258×181×143 mm
- 2-channel WDE Mass
- 4.67 kg
- Torque rise/fall time
- 80 ms
- Peak Power Consumption at max. torque and speed
- 168 W
- Steady State Consumption at max. constant speed
- 29 W
- Quiescent Power Consumption
- 7.6 W
- Supply voltage
- 28Vdc or 50Vdc
- Frequency
- up to 10 Hz
- Operating temperature
- -15°C to +60°C
About
The W18ES is a high-capacity variant of Bradford Space’s W18 Reaction Wheel Unit family, offering extended angular momentum storage. Part of the flight-proven W-series line used across LEO, MEO, HEO, GEO, planetary and interplanetary missions.
Features include high torque level over the full speed range, fixed torque rise time allowing precise and repeatable control, and proven low-RPM/zero-crossing performance with excellent micro-vibration characteristics.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.