Reaction Wheel for pico & nano satellites

The compact reaction wheel is especially designed for attitude control used in pico or nano satellites. Due to its cube shape with integrated electronic control it can be used in several configurations. The reaction wheel is provided with vacuum-rated bearings and components resisting radiation terms up to 200 Gy. Profiting from the experience of WITTENSTEIN cyber motor in the field of precise small permanentmagnet motors and ZFT in the field of reliable space electronics and software engineering.

Project NetSat

A complete observation of an object without blind spots requires the combination of images from different perspectives. We also want to avoid hidden points when observing the Earth, in order to set new standards in the three-dimensional observation of our planet and to be better positioned for future communication networks.The Centre for Telematics in Würzburg has developed four CubeSat mini-satellites (mass <4kg) for this purpose and launched them on 28 September 2020 from the Plessezk Cosmodrome into an orbit 600km above the Earth using a Soyuz rocket. On board are six WITTENSTEIN cyber motor reaction wheels per satellite. A radio link enables data exchange between the smallest satellites, which allows various manoeuvres to be carried out. The cyber® reaction wheel 2 takes over the position control in x-, y- and z-direction.

Excellent solution for ambitious missions


  • 20 x 20 x 20 mm (L x W x H)
  • < 30g


  • 5 V supply voltage
  • < 300mW power consumption at nominal speed


  • Individually balanced to reduce vibration
  • Self-calibrating control algorithm
  • Multiple optimization patterns


  • Radiation up to 200 Gy
  • -40°C to +85°C operating temperature

High performance density

  • Momentum storage: 2,0 mNms
  • Max. rotation speed: 20.000 rpm
  • Nominal torque: 0,1 mNm


  • UART
  • I2C
  • SPI

Technical construction

Extremely compact in a square space of 20 x 20 x 20 mm, the Reaction Wheel is especially designed for rough space conditions. The square construction makes space-saving integration possible and, with its low torque / weight ratio it provides maximum flexibility in the application. The efficiency, robustness and compactness characterize the Reaction Wheel.

Momentum storage 2,0 mNms

20 x 20 x 20 mm (L x W x H)

Designed for harsh space environment 

0,1mNm nominal torque

Flexible Interface

Situation aware control system

Hot restart failure recovery

Fire-and-forget control or programmed profile control

Technical data




Momentum storage (@20000 rpm)

2,0 mNms


Nominal rotation speed

20000 rpm


Nominal torque

0,1 mNm





< 30 g



20 x 20 x 20 mm




Supply voltage

5 V


Operating voltage

3,3 - 8,4 V


Power consumtion at nominal speed

< 300 mW


Power consumtion at peak

< 1000 mW





Operating temperature

-40°C to +85°C


Survival temperature

-60°C to +100°C


Operating time

25000 h


For a 360 ° alignment of the satellite, the Reaction Wheels can be positioned in various arrangements.
The most common variants are shown below:

Tetrahedron on board

Wheels on grid

Starter kit

For commissioning, we offer the reaction wheel starter kit, whereby the reaction wheel can be put into operation within a few moments using a PC and the MotionGUI 2 graphical user interface. This also allows diagnostics, optimisation and parameterisation to be carried out. 


Contact us

Is there anything you'd like to know about the Reaction Wheel? Do you require personal advice?

If so, please contact us directly. We look forward to hearing from you!