A shunt-excited DC generator has Vt vs Field current data curves as shown, for a machine running at both1400 and 1250 rpm respectively. a. Determine approximately the voltage to which the unit will build up for a field circuit resistance of 140 ohms. b. Define what critical field resistance is. c. Determine approximately that critical field resistance for the 1400 rpm case. d. When the machine is driven at 1250 rpm, determine the voltage at which it will build up. Vt 140 1400 rpm 120 1250 rpm 100 80 60 40 IF 20 0.5 1.0 1.5 In all cases show your work and explain what you are doing
A shunt-excited DC generator has Vt vs Field current data curves as shown, for a machine running at both1400 and 1250 rpm respectively. a. Determine approximately the voltage to which the unit will build up for a field circuit resistance of 140 ohms. b. Define what critical field resistance is. c. Determine approximately that critical field resistance for the 1400 rpm case. d. When the machine is driven at 1250 rpm, determine the voltage at which it will build up. Vt 140 1400 rpm 120 1250 rpm 100 80 60 40 IF 20 0.5 1.0 1.5 In all cases show your work and explain what you are doing
Introductory Circuit Analysis (13th Edition)
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Transcribed Image Text:A shunt-excited DC generator has Vt vs Field current data curves as shown, for a
machine running at both1400 and 1250 rpm respectively.
a. Determine approximately the voltage to which the unit will build up for a field
circuit resistance of 140 ohms.
b. Define what critical field resistance is.
c. Determine approximately that critical field resistance for the 1400 rpm case.
d. When the machine is driven at 1250 rpm, determine the voltage at which it will
build up.
Vt
140
1400 rpm
120
1250 rpm
100
80
60
40
IF
20
0.5
1.0
1.5
In all cases show your work and explain what you are doing
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