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About the main cause of slip rings catch fire

Discussion in 'Electronic Design' started by [email protected], Sep 12, 2007.

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  1. Guest

    Can anyone tell me any experience of how and when slip rings will
    catch fire?
    Any respond appreciated!
     
  2. Winfield

    Winfield Guest

    When they are made from wood, may be a possibility.
     
  3. Jim Thompson

    Jim Thompson Guest

    Sno-o-o-ort ;-)

    ...Jim Thompson
     
  4. Rich Grise

    Rich Grise Guest

    Win, I don't see you joke around much, but when you do, it's a zinger! ;-D

    Cheers!
    Rich
     
  5. John B

    John B Guest

    According to your post in another thread, you're the slipring expert.
    So why don't you tell us your website address and then we'll know what
    sliprings not to buy.
     
  6. hath wroth:
    Slip rings are made from copper alloy. Copper does not burn. The
    brushes are made from everything from conductive materials to powdered
    carbon and/or metalized graphite mixtures, which will burn quite
    nicely. If your brushes are on fire, you are probably drawing too
    much current, which is usually what happens when your rotor field
    windings develop a shorted turn or you overload your unspecified
    motorized contrivance. Slip rings are also used only in AC
    alternators, where a shorted diode can cause excessive current. You
    can also create a fire by using the wrong material for replacement
    brushes, the wrong size brushes, or insufficient contact area (high
    current density). If this happens to be an ST generator head you're
    trying to repair, the following might be useful:
    <http://www.utterpower.com/ST.htm>
    Notice that on 5kw and up models, dual brushes are used on the slip
    rings.
     

  7. The main cause would likely be: Extremely elevated temperature.
     
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