About MSCI
MicroWheel 200


The MicroWheel 200 (MW 200), part of MSCIís High Performance Attitude Control product line, is a reaction wheel torque actuator and angular momentum storage device for mini-satellites and microsatellites. The 200-series MicroWheel is for satellites requiring less than 200 mNms of momentum storage.

The MicroWheel is a ďsmartĒ sensor/actuator pair. It includes both a reaction wheel and an optional solid-state angular rate sensor, both of which are operated locally by an embedded micro-controller. The micro-controller implements local speed and torque control loops for the reaction wheel, allowing the reaction wheel to accurately track speed or torque commands from a satellite's attitude control computer.

MSCI is proud of the extensive flight heritage our world-leading MW 200 MicroWheels have gained Ė more than 47 years of operational wheel-hours in LEO orbit on three separate missions.


MSCI's MW 200 MicroWheels provide a simple, drop-in solution to satellite control. With their serial data interface, the MicroWheels perform all motor control tasks internally to generate precisely the torque requested by the Attitude Control System (ACS) computer.


MSCIís world-leading MW 200 MicroWheels have enabled MOST and other satellites to gather unprecedented science data, vastly improving previous microsatellite-pointing capabilities.

The MW 200ís key capabilities include:

  • Spaceflight-proven design
  • Low power consumption
  • All-in-one control and navigation solution (with optional rate sensor)

For more information, download the MicroWheel 200 Product Brochure


MSCIís Quality Assurance system ensures that appropriate quality requirements are established and achieved throughout the design, procurement, fabrication, assembly, inspection, testing, packing, and storing phases of the program. Implementation of the quality requirements ensures prompt detection of deficient or marginal quality and effective corrective action. Please click here to see more details on MSCIís Quality Control and Product Assurance.


Workmanship standards are employed throughout all phases of manufacturing, assembly and integration to control the quality of the operation. Standards identify specific acceptance/rejection criteria and are maintained to meet current requirements. Samples or visual aids required to verify acceptable workmanship are subject to review by QA. Please click here to see a list of the workmanship standards that are used at MSCI.

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Microwheel 200
We are proud of our outstanding flight heritage that continues to exceed all expectations. It is a testament to the quality of the minds at MSCI and to the excellence of their creations.
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