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Physical limitations of electromagnetic induction

  1. May 9, 2010 #1

    I am making a small induction motor and have been wondering about it's limits. I have googled a lot and can't find a helpful answer.

    Is there a maximum length of coil that a magnetic flux of specific strength can excite ?

    Thank you,

  2. jcsd
  3. May 9, 2010 #2
    There is no theoretical limit to induced emf from flux if your wire is resistance-less. Yours probably isn't, so, since a longer wire would have more resistance, which affects current, which in turn affects the motor's output, there probably are limits.

    The speed of the motor probably wouldn't change, as that is controlled by the frequency of the AC supplied to it. Instead, you might get less additional torque for additional length, if you use an extremely long wire. I wouldn't worry about it too much, though.
  4. May 10, 2010 #3
    Thank you Livect.
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