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Electromagnetic motor

  1. Feb 15, 2008 #1
    In order to make a electromagnetic motor, we wrap a coil of wire around a core. But wouldn't the metal core conduct as well, so we end up short-circuiting the system?
     
  2. jcsd
  3. Feb 15, 2008 #2

    stewartcs

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    They don't actually touch, the core is laminated (i.e. insultated from the inducing conductor). For example, if you look at a transformer drawing, you'll normally see the coils drawn with a slight seperation or gap from the core.

    Since motors work off of transformer action, you have the same effect in a motor.

    http://en.wikipedia.org/wiki/Image:Flux_leakage.svg

    Hope that helps.

    CS
     
  4. Feb 15, 2008 #3

    Doc Al

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    Staff: Mentor

    The wire is insulated.
     
  5. Feb 15, 2008 #4
    Thanks for the reply.

    So what is the purpose of the metal core?
     
  6. Feb 15, 2008 #5

    NoTime

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    The metal core forms a magnetic circuit directing the magnetic flux to where it is most useful. A core is not required but make things much more efficient.
     
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