A 250 V d.c. motor with an armature resistance of 1 is running unloaded at 1800
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Question:
A 250 V d.c. motor with an armature resistance of 1 Ω is running unloaded at 1800 rev/min and drawing a current of 2 A.
a) estimate the friction torque.
b) what voltage would you expect across the armature terminals of the motor immediately after it had suddenly been disconnected from the 250 V supply ?
c) given the full load current of the motor is 32 A. estimate the full load speed and the rated torque.
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