Reaction Wheel RW250 for Small Satellites


RW250 Features:

  • Integrated wheel drive electronics with latch-up protection
  • Different operation modes for speed and acceleration using model based controllers
  • High torque and speed stability (low noise)
  • Provides extensive housekeepings (e.g.: speed, voltage, current, temperatures)
  • Internal compensation of friction and time delays
  • Low level emitted vibrations, due to the mechanical design and the high level of alignments and balancing


Parameter RW 250 Remark
Angular momentum 4.0 Nms @ nominal speed
Nominal rotation speed 5000 rpm
Nomial reaction torque 0.1 Nm Max. commandable deliverable output torque over the whole speed range
Power interface
Supply voltage 23 to 34 V
Power consumption
≤ 2.5 W
≤ 7.0 W
≤ 13 W
100 W 
Stand by (motor off)
@ 1500 rpm
@ 5000 rpm
Maximum (max. torque/max. speed)
Mechanical interface
Mass ≤ 2.7 kg
Moment of inertia
7.65x10-3 kg m2
Rotating mass
Height: 81.6 mm
Diameter: 180 mm
Operation -20 °C to +50 °C
Start-up -30 °C to +60 °C
Survival temperature -40 °C to +70 °C
Data interface RS485/RS422
Design lifetime > 7 years In LEO
Storage time > 3 years (incl. 240 h of ground operation)