3. A series motor takes 285 amperes and develops 153 lb-ft torque when operating at 1200 rpm. Calculate the torque for a speed of 1700 rpm under the condition the current drops to 210 amperes and the flux is decreased by 18%.
3. A series motor takes 285 amperes and develops 153 lb-ft torque when operating at 1200 rpm. Calculate the torque for a speed of 1700 rpm under the condition the current drops to 210 amperes and the flux is decreased by 18%.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Please answer question number 3
Transcribed Image Text:1. A 200 V shunt motor has armature and shunt field resistances of 0.15 Q and 1250, respectively.
When running light, it takes 6 A and runs at 1200 rpm. A series winding of 0.05 is added to
make it long shunt commutatively compounded. This winding increases the flux per pole by 25%
when the motor is taking its full load current of 100 A. Neglecting armature reaction, solve for
the operating speed as a compound motor.
2. A four-pole machine generates 250 V when operated at 1500 rpm. If the flux per pole is
1.85x10 Maxwells, the number of armature slots is 45, and the armature winding have four
parallel paths. Calculate the number of conductors for each slot.
3. A series motor takes 285 amperes and develops 153 Ib-ft torque when operating at 1200 rpm.
Calculate the torque for a speed of 1700 rpm under the condition the current drops to 210
amperes and the flux is decreased by 18%.
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