Question 11 Assume that the motor is reconnected separately excited, as shown in Figure Q11. It has a fixed field voltage VF of 240 V and an armature voltage Va that can be varied from 120 to 240 V. IF RA IL 0.40 2 Radj VE = 240 V Rf = 100 N EA V = 120 to 240 V Lf Figure Q11 a) What is the no-load speed of this separately excited motor when Radj = 175 Q and 1) VA = 120 V, 2) VA = 180 V, 3) VA = 240 V b) What is the maximum no-load speed attainable by varying both VA and Radj? c) What is the minimum no-load speed attainable by varying both VA and Radj?
Question 11 Assume that the motor is reconnected separately excited, as shown in Figure Q11. It has a fixed field voltage VF of 240 V and an armature voltage Va that can be varied from 120 to 240 V. IF RA IL 0.40 2 Radj VE = 240 V Rf = 100 N EA V = 120 to 240 V Lf Figure Q11 a) What is the no-load speed of this separately excited motor when Radj = 175 Q and 1) VA = 120 V, 2) VA = 180 V, 3) VA = 240 V b) What is the maximum no-load speed attainable by varying both VA and Radj? c) What is the minimum no-load speed attainable by varying both VA and Radj?
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ISBN:9780133923605
Author:Robert L. Boylestad
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Transcribed Image Text:Question 11
Assume that the motor is reconnected separately excited, as shown in Figure Q11. It has a
fixed field voltage VF of 240 V and an armature voltage Va that can be varied from 120 to 240
V.
If
RA
IL
0.40 N
Radj
V = 240 V
Rp = 100 Q
|EA
V = 120 to 240 V
Lf
Figure Q11
a) What is the no-load speed of this separately excited motor when Radj = 175 Q and
1) VA = 120 V,
2) VA = 180 V,
3) VA = 240 V
b) What is the maximum no-load speed attainable by varying both VA and Radj?
c) What is the minimum no-load speed attainable by varying both VA and Radj?
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