Question: ( b ) A 2 2 0 V dc series motor has an armature resistance of 1 2 and series field winding resistance of 0

(

)

220

V dc series motor has an armature resistance of

1 2

and series field winding resistance of

0.4 2 .

On a certain load, the motor input current is

20

.

It is desired to reduce the speed of the motor by

30 % .

Calculate the resistance to be connected in series if the load torque varies as cube of the speed. Assume that the load torque includes the effect of mechanical loss of the The magnetic

(7)

motor.

circuit

unsaturated.

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