1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Asynchronous motor question

  1. Jun 2, 2013 #1
    1. The problem statement, all variables and given/known data
    number of pole pairs p =2
    line frequency f=50hz
    number of rotations n=1250 1/min


    2. Relevant equations



    3. The attempt at a solution


    question is number of rotations of the rotary magnetic field (1/min units)
    the slip of the machine(s)
    the frequency of the rotor current ?


    please help me to solve this kind of problems i have like 5 more questions which is smilar to this one so i can learn how to solve others thank you from now good luck at your exams :)
     
  2. jcsd
  3. Jun 2, 2013 #2

    rock.freak667

    User Avatar
    Homework Helper

    If you have the line frequency and the number of pole pairs, you can get the rotation of the stator Ns by using

    [tex]N_s = \frac{120f}{p}[/tex]

    where f is the line frequency and p is the number of poles.

    How is slip defined?
     
  4. Jun 2, 2013 #3
    s = Ns-Nr/Ns Ns is stator electrical speed, and Nr is rotor mechanical speed. thank you for your helps sir.
     
  5. Jun 2, 2013 #4

    rock.freak667

    User Avatar
    Homework Helper

    Right, so using the formula I gave you above, you can get Ns. They gave you the value of Nr, so can you get the slip?
     
  6. Jun 2, 2013 #5
    yes sir your help was enough, i wish you best of luck and thank you so much.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Asynchronous motor question
  1. Asynchronous counter (Replies: 1)

Loading...