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Induction motor equations question

  1. Jun 27, 2015 #1
    1. The problem statement, all variables and given/known data

    I came across these two equations in a chapter on induction motors, and I was wondering if they both calculate the same thing?

    ##w_r=sw_s##
    ##w_r=w_s - \frac{p}{2}w##

    2. Relevant equations

    3. The attempt at a solution
    s is the slip, ##w_r## and ##w_s## are the rotor and stator speed
     
  2. jcsd
  3. Jun 27, 2015 #2
    By stator speed, I assume you mean the synchronous speed of the rotating field. I take slip to be:

    s = 1-wr/ws.

    and usually X100 for %slip.
     
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