Answered: A separately excited DC motor is…

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 separately excited DC motor is rotated at 1000rpm, The variation of armature terminal voltage as a function of field current is measured under no-load conditions and tabulated below: IF 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 VT 0 30 60 85 102 115 124 130 134 The field winding supply VF=24V and the field resistance is adjustable. The armature winding resistance RA=0.2? and the armature terminal voltage VT=130V. a. Calculate the field current if the motor is operated with no-load at 1000 rpm b. The motor drives a load at 1200 rpm. Calculate the armature voltage at 1200 rpm if the field resistance RF=60? c. Calculate the torque for the above condition d. The motor supplies a mechanical load of 4000W at 1450rpm. The mechanical rotational losses are 160W, calculate the efficiency

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