A 220 V DC series motor draws full-load line current of 38 A at the rated speed of 500 rpm. The series field and armature resistance of the motor is 0.2 ohm and 0.4 ohm respectively. Considering brush drop as 3.0 V irrespective of the load and neglecting armature reaction, find: (i) The speed of the motor when the load current drops to 19 A (ii) The speed on removal of load when the motor takes only 1A from supply. (iii) The internal horse power developed in each of the above cases.

A 220 V DC series motor draws full-load line current of 38 A at the rated speed of 500 rpm. The series field and armature resistance of the motor is 0.2 ohm and 0.4 ohm respectively. Considering brush drop as 3.0 V irrespective of the load and neglecting armature reaction, find: (i) The speed of the motor when the load current drops to 19 A (ii) The speed on removal of load when the motor takes only 1A from supply. (iii) The internal horse power developed in each of the above cases.

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

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

A 220 V DC series motor draws full-load
line current of 38 A at the rated speed of
500 rpm. The series field and armature
resistance of the motor is O.2 ohm and
0.4 ohm respectively. Considering brush
drop as 3.0 V irrespective of the load and
neglecting armature reaction, find: (i) The
speed of the motor when the load
current drops to 19 A (ii) The speed on
removal of load when the motor takes
only 1A from supply. (iii) The internal horse
power developed in each of the above
cases. *

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