MicroWheel 4000


The MicroWheel is a “smart” 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 microcontroller. The microcontroller 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. Commands as well as telemetry (e.g., measured wheel speed, momentum, acceleration, torque, rate sensor measurements, temperatures, voltages, internal pressure, etc.) are communicated via a serial interface.


lifetime7 yr
maximum torque300 mN m
torque50 mN m
angular momentum storage4.0 N m s
operating temperaturemin: -30 C, max: 60 C
survival temperaturemin: -35 C, max: 65 C
idle power< 2.5 W
steady state power< 11 W
mass< 3.3 kg
length218 mm
width218 mm
radiation tolerance25 krad
height81 mm
dynamic unbalance< 0.1 mg m^2
angular speedmin: -10000 rpm, max: 10000 rpm
static unbalance< 1.0 mg m
voltage28 V



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Last updated: 2018-03-23