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detski

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**How to compute for the torque developed in the shaft of the motor??**

## Homework Statement

A DC series motor takes 40 A at 220 V and runs at 800 rpm. If the armature nd field resistnces are 0.2 ohm and 0.1 ohm respectively and the iron and friction losses are 0.5 KW. find the torque developed in the shaft of the motor. What will be the output of the motor?

## Homework Equations

## The Attempt at a Solution

What i did was:

EC= 220-40(.2+.1)

EC= 208

Power of the armature= (0.2)(40)^2=320

power of the field= (.1)(40)^2=160

Poutput= 8.8K-320-160-.5K

Poutput= 7820

7820=(2*pi*800*Torque)/60

Tout=93.34 Nm

My problem>> I don't know what's next..

Is the Friction & Iron Losses same as the SPL of it?