HW4/A train is driven by a DC machine with independent electrical excitation. At a speed of 1500 rpm, the following magnetization characteristic has been measured. 390 720 4 8 1- Sketch the equivalent circuit of the DC machine. 2- Why is a voltage induced in the armature when the excitation current is Ea(V) 30 If(A) 0 850 10 1080 1100 1110 28.8 12.8 14.4 zero? 3- Why does the induced voltage at high excitation currents not increase proportional to the excitation current?

HW4/A train is driven by a DC machine with independent electrical excitation. At a speed of 1500 rpm, the following magnetization characteristic has been measured. 390 720 4 8 1- Sketch the equivalent circuit of the DC machine. 2- Why is a voltage induced in the armature when the excitation current is Ea(V) 30 If(A) 0 850 10 1080 1100 1110 28.8 12.8 14.4 zero? 3- Why does the induced voltage at high excitation currents not increase proportional to the excitation current?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.

Question

HW4/A train is driven by a DC machine with independent electrical
excitation. At a speed of 1500 rpm, the following magnetization characteristic
has been measured.
Ea(V) 30
If(A)
1080 1100
12.8 14.4
390
720
850
0
4
S
10
1- Sketch the equivalent circuit of the DC machine.
2- Why is a voltage induced in the armature when the excitation current is
zero?
3- Why does the induced voltage at high excitation currents not increase
proportional to the excitation current?
1110
28.8
4- Sketch a power electronic converter that can be used to control the
voltage on the machine terminals.

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