Summary

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.

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Last updated: 2020-06-11

Specs

data interface
RS422/485
mass
< 0.94 kg
angular momentum storage
0.18 N m s
voltage
28 V
maximum power
45 W
idle power
< 2 W
length
100 mm
height
90 mm
lifetime
> 7 yr
survival temperature
-35 — 65 C
dynamic unbalance
< 0.05 mg m^2
torque
30 mN m
steady state power
< 7 W
static unbalance
< 0.5 mg m
angular speed
-10000 — 10000 rpm
operating temperature
-30 — 60 C
width
90 mm

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