S YNCHRONO US IND UCTION GENERA TOR 211

and shown in dotted lines in the same chart (Fig. 65), it is
seen that the voltage is maintained at load far better, and
especially at inductive load the machine gives almost perfect
regulation of voltage, with the constants assumed here.

To show the variation of voltage with a change of power-
factor, at the same output in current, in Fig. 66, the terminal
voltage, ei, is plotted with the phase angle as abscissae, from
wattless anti-inductive load, or 90° lead, to wattless inductive
load, or 90° lag, for constant current output of 400 amp. As
seen, at wattless load both machines give the same voltage but
for energy load the type (6) gives with the same excitation a
higher voltage, or inversely, for the same voltage the type (a)
requires a higher excitation. It is, however, seen that with the
same current output, but a change of power-factor, the voltage
of type (a) is far more constant in the range of inductive load,
while that of type (6) is more constant on anti-inductive load,
and on inductive load very greatly varies with a change of
power-factor.

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