Synchronous Motor

Discussion in 'Homework Help' started by ohcaptainmycaptain, Apr 29, 2010.

  1. ohcaptainmycaptain

    Thread Starter New Member

    Apr 29, 2010
    Given a 6 pole, 60 Hz synchronous motor is operating at a developed power of 5 Hp and a torque angle (power angle) of 5 degrees, find:

    a) The speed and torque (ft-lbs)?

    b) What is the power if the angle is 7 degrees?

    Any help would be great. I'm not sure how to treat the developed power since most formulas use the total power and the power losses are not provided.
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    Surely you can answer part (a)?

    I's a 6-pole 60Hz synchronous motor - what is the synchronous speed? The synchronous speed value has an equivalent angular velocity value.

    You know the developed shaft power is 5 Hp and presumably

    Power = (angular velocity) x Torque
  3. narnekarthik

    New Member

    Apr 28, 2010
    their is a formula for finding the synchronous motor speed it is as follows

    Ns=120 * f/p

    Ns= synchronous speed
    f= frequency
    P= number of poles
    using this formula u can calculate the synchronous speed