3. A 4-pole, 240 V, wave connected shunt machine gives 11.19 KW when running at 1000 rpm. The machine efficiency at this load is 91.42 % and the flux per pole is 15 mwb. The field and armature resistances are 240 2 and 0.1 2 respectively. Its armature has 47 slots, each slot contain 10 conductors and 2 coil sides. i. This machine operates as motor or generator? Why? ii. Calculate the different winding pitches. iii. Calculate the maximum efficiency. If this machine is reconnected as series motor with field resistance of 0.5 Q. The armature current and terminal voltage are not changed. Find the efficiency at this condition.
3. A 4-pole, 240 V, wave connected shunt machine gives 11.19 KW when running at 1000 rpm. The machine efficiency at this load is 91.42 % and the flux per pole is 15 mwb. The field and armature resistances are 240 2 and 0.1 2 respectively. Its armature has 47 slots, each slot contain 10 conductors and 2 coil sides. i. This machine operates as motor or generator? Why? ii. Calculate the different winding pitches. iii. Calculate the maximum efficiency. If this machine is reconnected as series motor with field resistance of 0.5 Q. The armature current and terminal voltage are not changed. Find the efficiency at this condition.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:3. A 4-pole, 240 V, wave connected shunt machine gives 11.19 KW when running at 1000 rpm. The
machine efficiency at this load is 91.42 % and the flux per pole is 15 mwb. The field and armature
resistances are 240 2 and 0.1 Q respectively. Its armature has 47 slots, each slot contain 10
conductors and 2 coil sides.
i. This machine operates as motor or generator? Why?
ii. Calculate the different winding pitches.
i. Calculate the maximum efficiency.
If this machine is reconnected as series motor with field resistance of 0.5 Q. The armature
current and terminal voltage are not changed. Find the efficiency at this condition.
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