- #1

Reefy

- 63

- 1

## Homework Statement

A 250V shunt dc motor runs at 1000rpm while taking a current of 25 A. The motor has armature and field resistance as 0.2W and 250W respectively. Calculate

(a) The speed when the load current is 50A.

(b) Armature torque developed at both speeds.

## Homework Equations

I

_{L}= I

_{a}+ I

_{sh}

V

_{t}= I

_{sh}R

_{sh}= E

_{a}+ I

_{a}R

_{a}

P

_{output}= Tω = T(2πN)

## The Attempt at a Solution

I already solved part a and got N

_{2}= 979.6 rpm

I actually just have a question of solving part B. How exactly do I compute the output without the torque and angular speed.

Is P

_{output}= I

_{a}R

_{a}

or P

_{output}= I

_{a}R

_{a}- (Iron + Friction) losses