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EMC Shielding for ArduCopter3.0

Posted by Jiro Hattori on June 25, 2013 at 5:40am

The EMC shielding material reduce magnetic interference that is good to ArduCpoter3.0.

Measurement of magnetic interference becomes half by 60micron meter low-loss,high permeability nano-crystalline material.

3689532263?profile=original

Without magnetic shield

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Magnetic shield applied

3689532347?profile=originalMagnetic shield material is Hitachi FINMET low-loss,high permeability nano-crystalline material.

http://www.hitachi-metals.co.jp/e/prod/prod02/p02_03.html

Similar material from 3M™ High Permeability Magnetic Shielding Sheet 1380 will also work.

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Comments

  • Dave July 22, 2013 at 8:08pm

    3692781122?profile=original

    This was my first attempt at using MU Metal to shield ESC wires and a UBEC. The UBEC has a buzzer on it that would cause the mag to shoot up. It worked well but took up too much space. It would be a tedious process to use smaller tubes lined with MU. Another option is to just lay the cables over a flat piece and tape them down.

  • Jiro Hattori July 1, 2013 at 2:43am

    In my understanding is something like:

    1) Shielding all magnetic field sources, such as ESCs, power distribution board, wrings and Lipo.

    or

    2) Protecting APM from artificial magnetic field. The copter is pitch and roll, so that the magnetic shielding also considering like GPS ground plain.

    3692760787?profile=original

  • Euan Ramsay July 1, 2013 at 2:12am
    Re: Earth...I thought the field ran from poles, so the magnetic lines are parrallel to the core...so as long as you don't mumetal *vertically*, you should be ok? So *horizontal* blocking (ie blocking fields directly below it) should be ok?

    Caveat: I failed physics at school :-)
  • Jiro Hattori July 1, 2013 at 1:49am

    Please make sure not to shielding magnetic field from Earth:-) 

  • Euan Ramsay July 1, 2013 at 1:30am
    Can I just go on record in saying that - if I was newb to quads (and I still am, I guess), or specifically APM, that the whole compassmot procedure & inteference mitigation is far too complex for a usability point of view.

    I understand the whole compassmot thing is new, but we need a better process than this, surely? How about a preset program/button in MP, which does a precise compassmot test? I've done repeated compassmot calibration on the same airframe, and the results vary considerably, which I can only attribute to the calibration procedure.

    Knowing what I know now about APM and what is needed to get good flight in 3.0.x, I would have bitten the bullet and got a Naza instead even at the extra cost. Naza has it's own problems of course, but it doesn't involve moongel, mumetal, spinning up props to 100% on the ground, etc etc.

    Sorry - bit of a rant there. I still love my APM, but if I was new to APM and 3.0.x, I might not be so favourable.
  • Euan Ramsay July 1, 2013 at 1:19am
    Got mine on order. Can't wait...got 148% compassmot, and while loiter/RTL works, I'm not happy that they have reached the same quality as in 2.9.1.
  • Dave June 30, 2013 at 2:14pm

    Thanks, I will get a shipment of Mu Metal early next week. I'm only at 60% mag interference so hopefully a little will go a long way. 

  • Jiro Hattori June 29, 2013 at 10:19pm

    Here is my setup.

    3692759598?profile=original

  • Dave June 29, 2013 at 9:28pm
    Are you mounting the MU directly under the APM or around it?
  • Jiro Hattori June 28, 2013 at 10:46pm

    Yes, it is really nice.

    Here is direct comparison of MagX on a same copter setup.

    3692759234?profile=original

This reply was deleted.