Page 258 - Solutions Manual to accompany Electric Machinery Fundamentals

(a) What is the no-load terminal voltage of the generator?

(b) Assuming no armature reaction, what is the terminal voltage of the generator with an armature
current of 20 A? 40 A?

(c) Assuming an armature reaction equal to 300 Aturns at full load, what is the terminal voltage of
the generator with an armature current of 20 A? 40 A?

(d) Calculate and plot the terminal characteristics of this generator with and without armature
reaction.

SOLUTION

(a) The total field resistance of this generator is 30 , and the no-load terminal voltage can be found
from the intersection of the resistance line with the magnetization curve for this generator. The
magnetization curve and the field resistance line are plotted below. As you can see, they intersect at a
terminal voltage of 121 V.

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