The motor is connected cumulatively compounded with Radi = 175 0, NF= 2700 turns, NSE=14 turns as shownin the figure below (RA+Rs= 0.21 0, RE= 75 0, Vr= 240 V) and the line current I= 110 A.!!0210=R, + ReRadEA75 0V 240 VCumelatively compounded- Differentially compoundedThe magnetization curve for this motor, taken at a speed of 1200 RPM, is given in the tabular form below:F (A)0.6490.7530.8560.9601.2501.530En (V)214229241255279196 e) The motor is now connected differentially compounded. What is the motor's field current in (A) when thearmature current reaches 20 A?Answer:n The motor is now connected differentially compounded. What is the motor's speed in (rpm) when thearmature current reaches 20 A?Answer

From the circuit diagram, IF=V(RF+RAdj)=240(75+175)=0.96 A From the table given in question, EA…

e) The motor is now connected differentially compounded. What is the motor's field current in (A) when the armature current reaches 20 A? Answer: n The motor is now connected differentially compounded. What is the motor's speed in (rpm) when the armature current reaches 20 A? Answer

e) The motor is now connected differentially compounded. What is the motor's field current in (A) when the armature current reaches 20 A? Answer: n The motor is now connected differentially compounded. What is the motor's speed in (rpm) when the armature current reaches 20 A? Answer

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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Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

The motor is connected cumulatively compounded with Radi = 175 0, NF= 2700 turns, NSE=14 turns as shown
in the figure below (RA+Rs= 0.21 0, RE= 75 0, Vr= 240 V) and the line current I= 110 A.
!!
0210=R, + Re
Rad
EA
75 0
V 240 V
Cumelatively compounded
- Differentially compounded
The magnetization curve for this motor, taken at a speed of 1200 RPM, is given in the tabular form below:
F (A)
0.649
0.753
0.856
0.960
1.250
1.530
En (V)
214
229
241
255
279
196

e) The motor is now connected differentially compounded. What is the motor's field current in (A) when the
armature current reaches 20 A?
Answer:
n The motor is now connected differentially compounded. What is the motor's speed in (rpm) when the
armature current reaches 20 A?
Answer

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