Reaction Wheel RW1 for Small Satellites
RW1 Features:
- Separate wheel drive electronics (WDE) for up to four Reaction Wheels
- PI controller for speed and acceleration
- Two different rotating masses available (Type A or Type B)
- Four different standard data interfaces available
- ow level emitted vibrations, due to the mechanical design and the high level of alignments and balancing
RW1
| Parameter | Type A | Type B |
| Angular momentum |
5.8 E-4 Nms |
1.0 E-4 Nms |
| Nominal rotation speed | 8000 rpm | |
| Maximum rotation Speed | ≈ 16 380 rpm | |
| Speed Resolution | 0.25 rpm (1LSB) | |
| Nomial Torque (max. commandable) |
23 E-6Nm |
4 E-6Nm |
| Torque Deviation – rms value |
<2.2 E-6Nm |
0.8 E-6Nm |
| Power interface | ||
| Supply voltage | 5 V | |
| Power consumption for WDE1 (stand by, motor off, Pwde) |
WDE for 1 wheel
WDE for 3 wheels
WDE for 4 wheels
|
< 250 mW < 350 mW < 500 mW |
|
maintaining nominal
rotation speed1,2
|
< 275 mW + PWDE | < 200 mW + PWDE |
|
maximum consumption1,2 |
< 375 mW + PWDE | < 300 mW + PWDE |
| Mechanical interface | ||
| Mass (including 40 cm cable) | ≤ 24 g | ≤ 15 g |
| WDE Mass | ≤ 45 g | |
| Moment of inertia |
694.5 E-9 kg m2 |
119.5 E-9 kg m2 |
| Dimension Single Wheel |
21 x 12 x 21 mm3 |
21 x 12 x 21 mm3 |
| Temperature | ||
| Operation | -20 °C to +50 °C | |
| Non-operation | -40 °C to +65 °C | |
| Design lifetime | 1 year in LEO | |
| Storage time | 2 years including 250h of ground operation | |
|
1 … values determined at ambient temperature (~25 °C), vacuum
2… based on the operation on 1 x RW1
|
||