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## Homework Statement

A three phase 220 V , 60 Hz, six poles 10 hp induction motor has the following circuit. Parameters on a per basis referred to the stator:

Rs = 0.334 Ω,

R’R = 0.147 Ω,

Xs = 0.498 Ω

X’R = 0.224 Ω ,

Xm = 12.6 Ω

The rotational losses including the core losses amount to 262 W and may be assumed constant. For a slip of 2.8 % determine (a) The line current and the power factor (b) The shaft torque and output horsepower (c) The efficiency

## Homework Equations

## The Attempt at a Solution

To get the line current, I need the equivalent impedance. But how do I get Rc (core resistance) ?, Is their a way to get it or is it just neglected because it is very large ?