# How to calculate stator to rotor winding turns ratio?

1. Jun 13, 2015

### theone

1. The problem statement, all variables and given/known data
I have a set of data that I need to use to calculate the stator to winding turns ratio. A hint was given:

"The rotor current measured is the rotor winding current. However, the rotor current we use for our calculations is the current referred to the stator side of the machine. Therefore, to get the right value, you have to account for the stator-to-turns ratio."

2. Relevant equations
$P_{in} - i_s^2R_s - i_r^2R_r = P_{dev}$

3. The attempt at a solution
I tried
$226 - (1.005)^212 - (X0.9)^218 = 213.819$
and got X=211.8 but I don't think its correct?

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2. Jun 18, 2015

### Greg Bernhardt

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

3. Jun 19, 2015

### Staff: Mentor

Because you measured the stator and rotor currents to be about equal, then it sounds like the turns ratio is 1:1

BTW, it would have been much better if you had typed the table values in your post, instead of attaching an almost indecipherible photo. That's something to remember for next time.