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?
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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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3ec6e96e-3f36-4414-a65b-c64bc207eb6b%2Fa09f94d6-1f27-490c-ad4b-0207c7b3c921%2F4i96dy_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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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