A DC machine (6kW, 120V, 1200rpm) has the following magnetization characteristics when running at the rated speed. 0.1 | 0.2 | 0.4 79 0.5 93 | 1.0 /A E:N 0.3 0.6 0.8 1.2 |20 40 114 120 5 60 102 125 The machine has armature resistance of R3=0.20, and the field winding resistance of R=100 Q. Two windings are separated. The machine is driven at 800rpm now. We adjust l=0.8A, then parallel R=2 0 to its armature terminals so that the machine is turned into a generator. (a) Determine the KO for the machine @ l=0.8A; (b) Determine E, and la@ l=0.8A, n=800rpm; (c) Determine the torque and the power consumed by RL.
A DC machine (6kW, 120V, 1200rpm) has the following magnetization characteristics when running at the rated speed. 0.1 | 0.2 | 0.4 79 0.5 93 | 1.0 /A E:N 0.3 0.6 0.8 1.2 |20 40 114 120 5 60 102 125 The machine has armature resistance of R3=0.20, and the field winding resistance of R=100 Q. Two windings are separated. The machine is driven at 800rpm now. We adjust l=0.8A, then parallel R=2 0 to its armature terminals so that the machine is turned into a generator. (a) Determine the KO for the machine @ l=0.8A; (b) Determine E, and la@ l=0.8A, n=800rpm; (c) Determine the torque and the power consumed by RL.
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Author:Robert L. Boylestad
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Transcribed Image Text:3.
A DC machine (6kW, 120V, 1200rpm) has the following magnetization characteristics
when running at the rated speed.
| 0
| 0.1
20
40
l/A
0.2
0.3
0.4
79
0.5
93
0.6
0.8
1.0
120
1.2
E:/V
| 5
60
102
114
125
The machine has armature resistance of R3=0.20, and the field winding resistance of R=100 n.
Two windings are separated. The machine is driven at 800rpm now. We adjust l=0.8A, then
parallel R=2 Q to its armature terminals so that the machine is turned into a generator.
(a) Determine the KO for the machine @ I=0.8A;
(b) Determine E, and la@ I=0.8A, n=800rpm;
(c) Determine the torque and the power consumed by RL.
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