W18 Reaction Wheel
Bradford Space
Compact reaction wheel assembly with analogue or digital interface, proven zero-crossing and low-RPM performance.
Typed specifications40 values · 1 checked
Discloses 7 of 10 fields engineers filter by in this category (category median 5).
- Mass
- 5 200 g datasheet p.2 4 670 g 2-channel WDE | 5 200 g RWA
- Envelope (L×W×H)
- Ø295×125 datasheet p.2 258×181×143 2-channel WDE | Ø295×125 RWA
- Angular momentum storage
- 18 N·m·s datasheet p.2 18 N·m·s W18
- Max torque
- 265 mN·m maximum gross torque (W18/W18E/W18ES) · datasheet p.2 265 mN·m max · gross torque✓ checked
- Speed range
- 4 000 rpm max · datasheet p.2 4 000 rpm max · maximum operational speed
- Supply voltage
- 28 V nom. · datasheet p.2 28 V nom. · power bus interface, 28Vdc or 50Vdc | 50 V nom. | 50 V nom. · power bus interface, 28Vdc or 50Vdc
- Power consumption
- 29 W steady state at max. constant speed · datasheet p.2 168 W Peak Power Consumption at max. torque and speed | 7.6 W Quiescent Power Consumption | 29 W Steady State Consumption at max. constant speed
- Data interface
- MIL-STD-1553 datasheet p.2 other analogue | MIL-STD-1553 MIL-STD-1553B
- Operating temperature
- -15 °C min · RWA · datasheet p.2 60 °C max · RWA | -15–60 °C RWA qualification | -30–60 °C WDE qualification
- 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 · datasheet p.2 15 g RMS RWA, out-of-plane (including notch to protect bearings) | 11.2 g RMS WDE, in-plane | 17.4 g RMS WDE, out-of-plane
- Flight heritage
- SOHO, RadarSat, Seastar, Olympus, INTEGRAL, XMM, Rosetta, Aeolus, BepiColombo datasheet p.1
- Quasi-static load
- 400 g RWA · datasheet p.2
- Shock qualification
- 2 000 g WDE · datasheet p.2 400–2 000 g RWA, depending on balancing requirements
- Drive electronics
- external Wheel Drive Electronics Box (WDE) · datasheet p.1
- Zero-speed crossing
- yes proven zero crossings · 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 supplier12 lines, in the manufacturer's own wording
- Interface
- Analogue or Digital
- Flight heritage
- SOHO, RadarSat, Seastar, Olympus, Integral, XMM, Rosetta, Aeolus, BepiColombo
- Momentum
- 18 Nms
- Maximum Operational Speed
- 4000 RPM
- Maximum Gross Torque
- 0.265 Nm
- RWA Dimensions
- Ø295×125 mm
- Mass
- 5.20 kg
- 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
- Operating temperature
- -15°C to +60°C
About
The W18 Reaction Wheel Unit (RWA) from Bradford Space is part of a heritage-proven reaction wheel family used for satellite attitude control. A minimum of three sets of RWA are needed per satellite to allow rotational control around the three axes, with a fourth generally present for redundancy.
The W18 offers high torque level over the full speed range, fixed torque rise time for precise and repeatable control, analogue or digital interface options, and accurate wheel speed signal reporting. Most braking energy is dissipated within the wheel drive electronics, with no energy injected back into the spacecraft power bus.
Flight heritage includes missions such as SOHO, RadarSat, Seastar, Olympus, Integral, XMM, Rosetta, Aeolus, and BepiColombo.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.