1. A dc shunt motor operating unloaded at an armature terminal voltage of 125 V is observed to be operating at a speed of 1420 r/min. When the motor is operated unloaded at the same armature terminal voltage but with an additional resistance of 82 in series with the shunt field, the motor speed is observed to be 1560 r/min Calculate the resistance of the shunt field. a. b. Calculate the motor speed which will result if the series resistance is increased from 8 Ω to 20 Ω. With the field resistance at its original value, calculate the motor speed if it is operated unloaded at a terminal voltage of 90 V c.
1. A dc shunt motor operating unloaded at an armature terminal voltage of 125 V is observed to be operating at a speed of 1420 r/min. When the motor is operated unloaded at the same armature terminal voltage but with an additional resistance of 82 in series with the shunt field, the motor speed is observed to be 1560 r/min Calculate the resistance of the shunt field. a. b. Calculate the motor speed which will result if the series resistance is increased from 8 Ω to 20 Ω. With the field resistance at its original value, calculate the motor speed if it is operated unloaded at a terminal voltage of 90 V c.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
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Transcribed Image Text:1. A dc shunt motor operating unloaded at an armature terminal voltage of 125 V is
observed to be operating at a speed of 1420 r/min. When the motor is operated
unloaded at the same armature terminal voltage but with an additional resistance
of 82 in series with the shunt field, the motor speed is observed to be 1560 r/min
Calculate the resistance of the shunt field.
a.
b. Calculate the motor speed which will result if the series resistance is increased
from 8 Ω to 20 Ω.
With the field resistance at its original value, calculate the motor speed if it is
operated unloaded at a terminal voltage of 90 V
c.
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