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Homework Help: Low speed permanent magnet snychronous generator

  1. Sep 7, 2009 #1
    1. The problem statement, all variables and given/known data

    A permanent magnet synchronous generator (as used in the wind industry) develops 5MW of electricity at 12 RPM; What amount of mechanical torque would be required to turn this generator at 12 RPM.? These generators are said to be 95% efficient

    2. Relevant equations

    Torque is part of the basic specification of an engine the power of an engine is expressed as its torque multiplied by its rotational speed of the axis usually known as rpm (revolutions per minute)

    Given P = 5 MW = 5000000 W.
    Revolutions per minute (rpm) = 12

    P = Torque * rpm.

    3. The attempt at a solution

    So Torque = P / rpm
    Torque = 5000000/12
    Torque = 416,616
    Last edited: Sep 7, 2009
  2. jcsd
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