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There is a magnetic friction force in a dynamo?

  1. Feb 17, 2010 #1
    There is a "magnetic friction force" in a dynamo?

    In a rotating dynamo, where the magnet rotates surrounded by a coil, there is something like a "magnetic friction force"? The magnetic field causes an effect similar to mechanical friction, that can slow down the revolving magnet?
     
  2. jcsd
  3. Feb 17, 2010 #2
    Re: There is a "magnetic friction force" in a dynamo?

    Does anyone know if such a thing exist?

    Imagine that the dynamo is in a vacuum chamber. The rotating magnet does not touch the coil, and there is no air, so there is no aerodynamic drag.

    So, I wonder if there is something like a "magnetic friction force", decelerating the rotating magnet. There is this?
     
  4. Feb 17, 2010 #3
  5. Feb 17, 2010 #4

    Redbelly98

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    Re: There is a "magnetic friction force" in a dynamo?

    Yes, it is well known. Some power tools employ the effect to stop motors quickly. It's a safety feature in for example power saws and electric lawnmowers.
     
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