Induction Motor, Parameter Test

[saad87]

Homework Statement

I just gave an exam where one of the questions was where I had to find the various parameters using the two forms of tests for an Induction motor:

No load test

Locked rotor.

Now, I can do this question but there is one thing that is confusing me. I had to find the stator core loss resistance, Rc. I was given the input power (450W) and I was also given the windage losses (300W).

Homework Equations

To find Rm, I use P = V^2/Rm

I am confused about whether I should use the input power or input power + windage losses?

I think it should be input power as it includes the windage losses anyway, no?

Here is the circuit:

 

[Valkarie]

The Attempt at a SolutionYes, you should use the input power to calculate Rm. This is because the input power includes both the active power and the windage losses, so using the input power will ensure that you are accounting for both of them.