Answered: Working with n = 1200 rpm at If = 2 A…

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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Of a free excited DC motor,

Excitation winding internal resistance Rf = 50 Ω, Supply voltage Vf = 100 V Armature winding internal resistance Ra = 0.5 Ω, Supply voltage Va = 250 V The magnetization (or idle running) characteristic of the machine at n = 1200 rpm is given in the table. Friction and iron losses are neglected.

According to this,

a) Working with n = 1200 rpm at If = 2 A excitation current,

b) Working at n = 1000 rpm at If = 2 A excitation current, Calculate the efficiency with the moment generated.

Ir (A)
Ea (V)
0.5
1
1.5
2
7
70
140
200
238

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