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Ever wondered how and what those ferrite rings on ESC BEC le


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Burgess
Extreme 3D
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Joined: 27 Mar 2012
Posts: 1092
Location: Wales

PostPosted: Sun Dec 13, 2015 6:15 am
PostPost subject: Ever wondered how and what those ferrite rings on ESC BEC le
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The electronic noise generated within ESC circuitry -FET switching logic etc, this noise can produce random voltage spikes on the BEC positive and ground lines adversely effecting the microprocessor in the receiver, resulting in servo glitching.

The ferrite toroid appears as a low resistance path to the voltage spike at specific frequencies. The toroid changes the impedance of the power lines for the AC noise, but doesn't effect the dc. The energy of the high frequency component dissipates as heat in the ferrite ring.

It would appear that the important dimension of the toroid is not its inside or outside diameter, but rather the length of the toroid from end to end. So if one ring fails to sort the problem, winding the BEC lead around two rings together may-well do the trick.

I found this article in pdf format.
http://audiosystemsgroup.com/SAC0305Ferrites.pdf

Not specifically about ESCs but should help in gaining some insights into how to suppress voltage spikes and reduce/eliminate glitches.





Burgess
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tombo242
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Sun Dec 13, 2015 7:38 am
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That's a really useful insight Burgess, thanks for posting it. Very Happy

Tom.
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