Page 271 - Solutions Manual to accompany Electric Machinery Fundamentals

(c) If the armature current is 40 A, then the effective field current contribution from the armature
current
N SE I 25   40 A  1.0 A
N F A 1000

I
and the I A  A R S R  voltage drop is R  A R S  40 A   0.21   8.4 V . The location where
A
N
the triangle formed by SE I and I A R A exactly fits between the E A and V T lines corresponds to a
A
N F
terminal voltage of 121 V, as shown below.

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