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Quick question regarding Induction Machines (3 phase)

Discussion in 'Homework Help' started by jegues, Dec 10, 2011.

  1. jegues

    Thread Starter Well-Known Member

    Sep 13, 2010
    732
    45
    Why is that we desired our induced voltage to be a sine wave when working with 3 phase induction machines?
     
  2. thatoneguy

    Expert

    Feb 19, 2009
    6,349
    732
    As opposed to what other waveform that would transfer efficiently through transformers?
     
  3. crutschow

    Expert

    Mar 14, 2008
    23,136
    6,862
    An AC motor rotates at the speed determined by the fundamental sine wave frequency and the number of motor poles. Anything other than a sine wave has harmonics at higher frequencies which do not contribute to the fundamental magnetic field and thus to driving the motor. The energy from these harmonics is dissipated as waste heat in the motor which is obviously undesirable.
     
  4. jimkeith

    Well-Known Member

    Oct 26, 2011
    539
    100
    The source voltage is a sine wave--that is what our electric utilities generate--as a result the induced wave will also be sine wave.
     
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