Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
a) A six-pole, lap-wound, 220 V, shunt-excited d.c. machine takes an armature current of 2.5 A when unloaded at 950 r/min. When loaded, it takes an armature current of 54 A from the supply and runs at 950 r/min. The resistance of the armature circuit is 0.18 S2 and there are 1044 armature conductors. For the loaded condition, calculate: the induced e.m.f. CS Scanned with CamScanner i. ii. the useful flux per pole. iii. the torque developed by the machine in Nm.
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Transcribed Image Text:a) A six-pole, lap-wound, 220 V, shunt-excited d.c. machine takes an armature current of 2.5 A when unloaded at 950 r/min. When loaded, it takes an armature current of 54 A from the supply and runs at 950 r/min. The resistance of the armature circuit is 0.18 S2 and there are 1044 armature conductors. For the loaded condition, calculate: the induced e.m.f. CS Scanned with CamScanner i. ii. the useful flux per pole. iii. the torque developed by the machine in Nm.
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