A 8-pole lap-wound dc generator is designed to have an average air gap flux density of 0.8 T. The armature winding resistance is 0.3 Ω, and the brush contact drop is 1 V. There is a slight fault in the magnetic circuit which causes the emfs in two of the paths to be 5 % more than the nominal value, and the emfs in the other two paths 5 % less. a. If the generator supplies a full load of 4.5 kw at 150 V, find the nominal and actual values of path emfs, coil currents, and armature copper loss. b. Find the nominal and actual values of coil currents and armature copper loss when the generator has no external load.
A 8-pole lap-wound dc generator is designed to have an average air gap flux density of 0.8 T. The armature winding resistance is 0.3 Ω, and the brush contact drop is 1 V. There is a slight fault in the magnetic circuit which causes the emfs in two of the paths to be 5 % more than the nominal value, and the emfs in the other two paths 5 % less. a. If the generator supplies a full load of 4.5 kw at 150 V, find the nominal and actual values of path emfs, coil currents, and armature copper loss. b. Find the nominal and actual values of coil currents and armature copper loss when the generator has no external load.
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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: A 8-pole lap-wound dc generator is designed to have an average air gap flux density of 0.8 T. The armature winding resistance is 0.3 Ω, and the brush contact drop is 1 V. There is a slight fault in the magnetic circuit which causes the emfs in two of the paths to be 5 % more than the nominal value, and the emfs in the other two paths 5 % less.
a. If the generator supplies a full load of 4.5 kw at 150 V, find the nominal and actual values of path emfs, coil currents, and armature copper loss.
b. Find the nominal and actual values of coil currents and armature copper loss when the generator has no external load.
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