A 20-hp, 200-V, shunt wound DC motor has an armature resistance of 0.7 Q and a field resistance of 100 Q. The adjustable resistor, Rsdj can be adjusted from 50 2 to 350 2. Figure 1 shows the motor's circuit diagram, and Figure 2 illustrates its magnetisation curve. R. Rali Re EA Figure 1: Equivalents circuit of a dc motor 300 280 260 Speed = 1500 rpm 240 220 200 180 160 140 120 100 so 60

Delmar's Standard Textbook Of Electricity
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Author:Stephen L. Herman
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Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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A 20-hp, 200-V, shunt wound DC motor has an armature resistance of 0.7 Q and a field resistance of 100
Q. The adjustable resistor, Rsdj can be adjusted from 50 2 to 350 2. Figure 1 shows the motor's circuit
diagram, and Figure 2 illustrates its magnetisation curve.
R.
Rali
Re
EA
Figure 1: Equivalents circuit of a dc motor
300
280
260
Speed = 1500 rpm
240
220
200
180
160
140
120
100
so
60
40
20
o 01 02 03 04 05 06 0.7 08 09 1 11 12 1.3 14 1.5 1.6 1.7 1.8 19 2
Figure 2: Magnetization curve of a de motor.
Transcribed Image Text:A 20-hp, 200-V, shunt wound DC motor has an armature resistance of 0.7 Q and a field resistance of 100 Q. The adjustable resistor, Rsdj can be adjusted from 50 2 to 350 2. Figure 1 shows the motor's circuit diagram, and Figure 2 illustrates its magnetisation curve. R. Rali Re EA Figure 1: Equivalents circuit of a dc motor 300 280 260 Speed = 1500 rpm 240 220 200 180 160 140 120 100 so 60 40 20 o 01 02 03 04 05 06 0.7 08 09 1 11 12 1.3 14 1.5 1.6 1.7 1.8 19 2 Figure 2: Magnetization curve of a de motor.
(b) .
Calculate the starting current of this motor ifRadj is set to 50 9.
Transcribed Image Text:(b) . Calculate the starting current of this motor ifRadj is set to 50 9.
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