Q24. A 220V D.C. shunt motor has an armature resistance of 0.5S2 and is excited to produce constant flux. At full load the motor runs at 1000 rpm taking an armature current of 40A. i) If a resistance of 0.82 is inserted in series with the armature, Calculate the generated emf. ii) Estimate speed at full load if the load torque is constant.

Q24. A 220V D.C. shunt motor has an armature resistance of 0.5S2 and is excited to produce constant flux. At full load the motor runs at 1000 rpm taking an armature current of 40A. i) If a resistance of 0.82 is inserted in series with the armature, Calculate the generated emf. ii) Estimate speed at full load if the load torque is constant.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.

Question

Estimate the generated e.m.f. if, the speed increases to 1280rev/min
and the pole flux remains unchanged.
Q24.
A 220V D.C. shunt motor has an armature resistance of 0.52 and is
excited to produce constant flux. At full load the motor runs at 1000
rpm taking an armature current of 40A.
i) If a resistance of 0.82 is inserted in series with the armature, Calculate
the generated emf.
ii) Estimate speed at full load if the load torque is constant.

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