Reaction Wheel RWT250 for Small Satellites


RWT250 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 RWT 250 Remark
Angular momentum 4.0 Nms @ nominal speed
Nominal rotation speed 5000 rpm
Nomial reaction torque 0.3 Nm Max. commandable deliverable output torque over the whole speed range
Power interface
Supply voltage 23 to 34 V
Power consumption
≤ 3.0 W
≤ 15.0 W
≤ 200 W
Stand by (motor off)
@ 5000 rpm
Maximum (max. torque/max. speed) 
Mechanical interface
Mass ≤ 3.0 kg
Moment of inertia
7.64e-3 kg m2
Rotating mass
Height: ≈100 mm
Diameter: 200 mm 
Operation -20 °C to +50 °C
Start-up -30 °C to +60 °C
Survival temperature -30 °C to +70 °C
Data interface RS485/CAN
Design lifetime > 7 years Depending on electronics grade (up to 10 years)
Storage time > 3 years (incl. 240 h of ground operation)