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Attitude Control Mechanisms; Anything that rotates the cubesat
Topic Started: Sep 11 2008, 01:59 PM (513 Views)
matt.janish
ACS
I found a nice little reaction wheel:

IntelliTech Microsystems

7.62 x 7.62 x 6.98 cm
2.4 W power supply (12 V @ 200 mA)
Suitable for a satellite weighing up to 20 lbs.


edit- The weight of this wheel makes it out of the question. I forgot we're limited to 1 kg. Check out this site instead: Sinclair Interplanetary reaction wheels
Edited by matt.janish, Sep 11 2008, 07:06 PM.
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matt.janish
ACS
Looking at past cubesat missions, it appears that very few of them used reaction/momentum wheels for attitude control. Many of them used magnetorquers.

It also seems as though sun sensors were widely used for orientation, as well as magnetometers. I even saw one that used a horizon sensor/star tracker combo, which seems to be a low-cost option.

The list of cubesat missions that Suarav posted should tell us a lot about the practicality of the different options we find.
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jessica

This site links to places to actually buy magnetometers of various kinds:
www.magnetometer.org

and here's a site that has a good intro to geomagnetism and information on the IGRF model:
http://geomag.usgs.gov/

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Brenda.Granados
ACS
magnetorquers = magnetic torquers?

i'm not sure if this is what we are looking for, but i found a brochure for magnetic torquers that gives a brief overview about it's uses:

http://www.smad.com/ie/ieframessr2.html

under Off the Shelf Sizes, there's a link to the brochure. it doesn't get very specific with prices.

i think i read somewhere that magnetic torquers may be used in combination with the reaction wheels. i could probably cite the source later.
Edited by Brenda.Granados, Sep 13 2008, 04:48 PM.
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matt.janish
ACS
Look at tables 2 and 3 on page 2 of the paper here: sun sensor paper

This seems like a really good idea.
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