Figure Q4(b) 150 130 120 100 90 so 70 60 40 30 20 Sht field cament, A 1000 2000 3000 5000 7000 Tomial ad genoted voltage, V

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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120 V
Figure Q4(b)
160
150
140
130
120
100
90
80
70
60
50
40
30
20
10
Shunt fielt current, A
1000
2000
3000
4000
S000
6000
7000
Field mnl, A tums
Note: Column I contains field current in amps, and column 2 contains the internal
generated voltage Ea in volts.
Figure Q4(b)(i)
Tomial sad genonted voltage, V
Transcribed Image Text:120 V Figure Q4(b) 160 150 140 130 120 100 90 80 70 60 50 40 30 20 10 Shunt fielt current, A 1000 2000 3000 4000 S000 6000 7000 Field mnl, A tums Note: Column I contains field current in amps, and column 2 contains the internal generated voltage Ea in volts. Figure Q4(b)(i) Tomial sad genonted voltage, V
(b)
Consider the separately excited DC generator and the magnetization curve as shown
in Figure Q4(b). The following data are known about the machine:
RA = 0.18 N
VF = 120 V
NF = 1000 turns per pole
Radj = 0 – 25 N
Rf = 24 N
Its field current is rated at 5A. The generator is rated at 6 kW, 120 V, 50 A and 1800
rpm. Assuming no armature reaction. Answer the following questions about this
generator.
(i)
If this generator is operating at no load, analyze the range of voltage
adjustment that can be achieved by changing Radj. The magnetization curve
is shown in Figure Q4(b)(i).
If the armature current of the generator is 50 A, the speed of the generator is
1700 rpm, and the terminal voltage is 106 V. Determine the field current that
must be flowing in the generator.
(ii)
Transcribed Image Text:(b) Consider the separately excited DC generator and the magnetization curve as shown in Figure Q4(b). The following data are known about the machine: RA = 0.18 N VF = 120 V NF = 1000 turns per pole Radj = 0 – 25 N Rf = 24 N Its field current is rated at 5A. The generator is rated at 6 kW, 120 V, 50 A and 1800 rpm. Assuming no armature reaction. Answer the following questions about this generator. (i) If this generator is operating at no load, analyze the range of voltage adjustment that can be achieved by changing Radj. The magnetization curve is shown in Figure Q4(b)(i). If the armature current of the generator is 50 A, the speed of the generator is 1700 rpm, and the terminal voltage is 106 V. Determine the field current that must be flowing in the generator. (ii)
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