SHUNT MOTOR
(a) A shunt-wound motor set was designed to run from a 250 V d.c.
supply. It had an effective armature resistance of 3 m( and when run at
3000 rev/min it drew 10 kA.
Find:
(i) the maximum permissible supply voltage at start-up if the motor set
is not to draw more than 20kA when started from rest
(ii) the maximum start-up torque available
(b) Ignoring friction, and assuming that the motor set is geared such
that the locomotive would be travelling at 50 m s-1 when the motor
reaches 3000 rev/min, what would be the greatest total vehicle mass
(including locomotive, wagons, etc.) that this locomotive could pull
from rest on a 1 in 10 incline?
Electrical and Computer Engineering Homework Solutions
#2090
Finding the Start-up Torque for a Shunt-wound Motor
I am having difficulty determining the start up torque for the motor.
If you could also explain how to do the other parts that would be great. Thanks
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