Answered: A 20-hp, 250-V shunt motor has an…

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 20-hp, 250-V shunt motor has an armature-circuit resistance of 0.25 Ω and a field resistance of 125 Ω. At no-load and rated voltage, the speed is 1800 rpm and the armature current is 4 A. At full-load and rated voltage, the line current is 52 A. What is the full-load speed

Expert Solution

Step 1: Determination of given parameters,

The terminal voltage, $V subscript T equals 250 space V$

The armature resistance, $R subscript a equals 0.25 space capital omega$

The field winding resistance, $R subscript s h end subscript equals 125 space capital omega$

The no-load speed and armature current of the DC shunt motor will be,

$N subscript N L end subscript equals 1800 text RPM end text I subscript N L end subscript equals 4 text A end text$

The current at full load,

$I subscript F L end subscript equals 52 text A end text$

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