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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.

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.

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter29: Dc Generators
Section: Chapter Questions
Problem 10RQ: What is armature reaction?
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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.
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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