Torque Compensation Unit (TCU)

RUAG Space Mechanisms is a reference in the development of mirror actuators for inorbit applications. In order to compensate for the torque generated by the flex pivot guiding the rotation of a mirror, RUAG Space proposed their client to integrate a Torque Compensation Unit (TCU). This mechanism has a similar behavior to a mechanical spring but uses a permanent magnet instead of elastic deformation to generate a force. This technology was successfully implemented in the scanner developed by RUAG Space for the ESA Sentinel-4 mission and needed to be adapted to this new application. Dedicated to the “new-space” industry, the main design driver was to reduce the future production costs.

Collaboration and Timeline

  • with: Beyond Gravity (former RUAG Space Mechanism)
  • date: February 2021
  • duration 2 months

Technical skills:

  • Solidedge CAD design
  • Electromagnetic FEM
    (Ansys Maxwell)
  • Solutions Trade-Off


  • Design for space environment
  • High precision machining
  • Aerospace bonding assembly