Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Frequency - Induction Motor

  1. Dec 17, 2013 #1

    I'm doing a question in induction motor now.

    formula for Induced torque is Pgap / Ws.

    i have found the Pgap, but in order to find Ws, i need frequency to find ns..
    so my question is, how to find frequency with only given 10hp and four pole
  2. jcsd
  3. Dec 18, 2013 #2


    User Avatar

    Staff: Mentor

    The rated speed of an induction motor is typically within 5% of that motor's synchronous speed. http://www.engineeringtoolbox.com/speed-electrical-motors-d_738.html

    Broadly speaking, in engineering, an answer correct to within 10% is generally acceptable. There are always exceptions to rules of thumb, but I can't see the question under discusion being one of them. :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook