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Q3:A: (a) A 10-hp 230-volt shunt-wound motor has rated speed of 1000 rpm and full-load efficiency of 86 percent. Armature-circuit resistance, 0.26 ohm; field-circuit resistance, 225-ohms. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon back emf, armature current and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?

Q3:A: (a) A 10-hp 230-volt shunt-wound motor has rated speed of 1000 rpm and full-load efficiency of 86 percent. Armature-circuit resistance, 0.26 ohm; field-circuit resistance, 225-ohms. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon back emf, armature current and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Q3:A: (a) A 10-hp 230-volt shunt-wound motor has rated speed of 1000 rpm and full-load efficiency of 86 percent. Armature-circuit resistance, 0.26 ohm; field-circuit resistance, 225-ohms. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon back emf, armature current and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?
Transcribed Image Text:Q3:A: (a) A 10-hp 230-volt shunt-wound motor has rated speed of 1000 rpm and full-load efficiency of 86 percent. Armature-circuit resistance, 0.26 ohm; field-circuit resistance, 225-ohms. If this motor is operating under rated load and the field flux is very quickly reduced to 50 percent of its normal value, what will be the effect upon back emf, armature current and torque? What effect will this change have upon the operation of the motor, and what will be its speed when stable operating conditions have been regained?
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