# Synchronous Motor

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

1. ### ohcaptainmycaptain Thread Starter New Member

Apr 29, 2010
1
0
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
5,448
789
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
4
0
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