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Thread: What is the ferrot ring for on a SBEC

  1. #1
    Pilot Hockeystud87's Avatar
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    What is the ferrot ring for on a SBEC

    So I'm currently in school and I was just getting through my electromagnetic physics class and we went over ferrot materials. I was wondering what exactly is the purpose of the ferrot ring used in many SBEC's? My educated guess is each other it's used to resist large power drains from servos causing brown outs or to cancel out interference given off.

  2. #2
    Pilot
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    Did you mean ferret ring?

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    Navigator faber's Avatar
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    Quote Originally Posted by TZZDC1241 View Post
    Did you mean ferret ring?
    OMGWTFLMAO

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    Engineer for Jesus Christ IBCrazy's Avatar
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    The ferrite ring is to prevent voltage spikes and RF emissions from tracking down the cables intothe rest of the system.

    _Alex
    If it is broken, fix it. if it isn't broken, I'll soon fix that.

    videoaerialsystems.com - Performance video piloting

  5. #5
    Pilot Hockeystud87's Avatar
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    Thank you Alex.

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    Any net current in the line will induce a magnetic field in the ring, making it an inductor. Inductors resist any instantaneous change in current, so spikes are spread out over time and reduced in amplitude.

    But why ferrite? Wouldn't iron be better? And why wrap all wires? Wouldn't it make more sense to wrap each of the three wires individually? The electrons travelling on + will induce one magnetic field, but the return current will induce something equal and opposite? No?

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    Pilot Hockeystud87's Avatar
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    You have to have a material that can be turned into a magnet, in order for it to be able to induce the current.

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    Ok, well Wikipedia has answered my questions for me...

    An iron core inductor is nice and efficient, but would have a higher reactance and might even reflect noise as much as remove it. The ferrite creates an inductor with a very low Q factor... which is less efficient, and actually removes the high frequency noise by turning it into a tiny bit of heat. A normal inductor would not remove as much noise.

    Reference:
    http://en.wikipedia.org/wiki/Ferrite_bead

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