A 107 hp, 257 V dc shunt motor has the magnetization curve in the graph. The armature circuit resistance, including brushes, is 0.032 ohm. no load rotational losses are 2077 W and the stray loss is 1% of the output The field rheostat is adjusted for a no-load speed of 1107 rpm a. What would be the field current at no load when speed is 1100 rpm b. Determine Specd and output in horsepower corresponding to an armature current of 400A c. Now a cumulative series turns 2 (Nse) per pole is to be added with Rse negligible and 1000 turns in Shunt field find speed corresponding to an armature current of 400A Mmf or shunt-ficld current. per unit 0.6 0.8 1.0 12

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A 107 hp, 257 V dc shunt motor has the magnetization curve in the graph. The armature circuit
resistance, including brushes, is 0.032 ohm . no load rotational losses are 2077 W and the stray
loss is 1% of the output
The field rheostat is adjusted for a no-load speed of 1107 rpm
a. What would be the field current at no load when speed is 1100 rpm
b. Determine Specd and output in horsepower corresponding to an armature current of 400A
c. Now a cumulative series turns 2 (Nse) per pole is to be added with Rse negligible and 1000
turns in Shunt field find speed corresponding to an armature current of 400A
Mmf or shunt-field current, per unit
0.8
0.2
0.4
0.6
1.0
1.2
1.4
320
300
280
260
LO
240
220
200
0.8
180
160
0.6
140
120
100
0.4
80
60
0.2
40
20
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
Shunt-field current, A
Magnetization curve for 257 V and 1207 rpm de machine
Generated voltage, V
Generated voltaoe. Der unit
Transcribed Image Text:A 107 hp, 257 V dc shunt motor has the magnetization curve in the graph. The armature circuit resistance, including brushes, is 0.032 ohm . no load rotational losses are 2077 W and the stray loss is 1% of the output The field rheostat is adjusted for a no-load speed of 1107 rpm a. What would be the field current at no load when speed is 1100 rpm b. Determine Specd and output in horsepower corresponding to an armature current of 400A c. Now a cumulative series turns 2 (Nse) per pole is to be added with Rse negligible and 1000 turns in Shunt field find speed corresponding to an armature current of 400A Mmf or shunt-field current, per unit 0.8 0.2 0.4 0.6 1.0 1.2 1.4 320 300 280 260 LO 240 220 200 0.8 180 160 0.6 140 120 100 0.4 80 60 0.2 40 20 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Shunt-field current, A Magnetization curve for 257 V and 1207 rpm de machine Generated voltage, V Generated voltaoe. Der unit
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