Answered: shunt-wound motor runs at 600 r.p.m…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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a shunt-wound motor runs at 600 r.p.m from a 230 V supply when taking a line current of 50 A. its armature and Field resistance are 0.4 ohms and 104.5 ohms respectively. Neglecting the effects of armature reaction and allowing 2 V brush drop, calculate (a) the no-load speed if the no-load line current is 5 A. (b) the resistance to be placed in armature circuit in order to reduce the speed to 500 r.p.m when motor is taking a line current of 50 A . (c) the percentage reduction in the flux per pole in order that the speed maybe 750 r.p.m when the armature is 30 A with no added resistance in the armature circuit.

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