A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current of 70 A when operating at rated conditions. The armatureresistance of the motor, RA is 0.12 Q and the field resistance RF is 40 0. The adjustable resistance of the motor in the field circuit, Radimay be varied over the range from 0 to 200 Q and currently set at 100 Q. Armature reaction can be ignored in this machine.The magnetization curve for this motor, taken at a speed of 1000 rpm is summarized in the following table. Note that linear interpolationapplies when the value is not explicitly stated in the table.EA, V7895112118126IF, A0.000.801.001.281.442.88If the motor is now unloaded with no changes in terminal voltage or Radj, how much is the increase in the no load speed of the motor?Hint: For linear interpolation in the interval, the formula to obtain the unknown point in this interval is as follows:Уo (х, — х) + у, (х — хо)y =X1 - Xo

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Engineering

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A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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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

A 10-hp, 120-V, 1000 rpm shunt DC motor has a full load armature current of 70 A when operating at rated conditions. The armature
resistance of the motor, RA is 0.12 Q and the field resistance RF is 40 0. The adjustable resistance of the motor in the field circuit, Radi
may be varied over the range from 0 to 200 Q and currently set at 100 Q. Armature reaction can be ignored in this machine.
The magnetization curve for this motor, taken at a speed of 1000 rpm is summarized in the following table. Note that linear interpolation
applies when the value is not explicitly stated in the table.
EA, V
78
95
112
118
126
IF, A
0.00
0.80
1.00
1.28
1.44
2.88
If the motor is now unloaded with no changes in terminal voltage or Radj, how much is the increase in the no load speed of the motor?
Hint: For linear interpolation in the interval, the formula to obtain the unknown point in this interval is as follows:
Уo (х, — х) + у, (х — хо)
y =
X1 - Xo

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