About MSCI
MicroWheel 200 (MW200) Reaction Wheel


MSCI is proud of the extensive flight heritage our world-leading MicroWheel 200 (MW 200 Reaction Wheel) has gained.

The MW 200, part of MSCIís High Performance Attitude Control product line, is a small, digitally controlled reaction wheel for space applications. The 200-series MicroWheel is for satellites requiring less than 200 mNms of momentum storage. It can include an optional angular rate sensor, to allow the device to become a sensor/actuator pair. An embedded microcontroller operates both the reaction wheel and optional rate sensor. The microcontroller implements speed and torque control loops for the reaction wheel, allowing it to accurately track speed or torque commands from a satelliteís attitude control computer. Commands and telemetry (including wheel speed, acceleration, torque, rate sensor reading, temperature, voltage, current, and internal pressure) are communicated via a serial interface.

The MicroWheel reaction wheel is hermetically sealed, containing a <0.1 ATM dry argon environment, to prevent the loss of bearing lubricant, and to promote convective heat exchange.


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.


The MW 200ís key capabilities include: ∑ Spaceflight-proven design ∑ Low power consumption ∑ All-in-one control and navigation solution (with optional rate sensor)


Qualification testing complete; flight units delivered for multiple programs.

For more information, download the MicroWheel 200 Product Brochure.


MSCIís Product Assurance program ensures that appropriate quality requirements are established and achieved throughout the design, procurement, fabrication, assembly, inspection, testing, storing, shipping and handling 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 Product Assurance program.


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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