December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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71AC Generator
q-axis components, both rotating with the rotor, but each with its own steady mag-
netic path. The d- and q-axis analysis is beyond the scope here, but the nal result,
which supports what we reasoned above, is given below:
P
EV
X
V
XX
XX
fT
d
T
dq
dq
salient-pole
w=+
−
()
si
ns
in
δδ
2
2
2aatts/phase
(3.9)
where X
d
and X
q
are the d- and q-axis synchronous reactance of the machine. For
the salient pole machines, the value of X
d
is always greater than that of X
q
. For a
cylindrical rotor machine, the magnetic circuits in d- and q-axes are identical, giving
(b) Salient pole rotor with separatel
y
wound field coil around poles
Rotor
flux
Rotor
flux
(a) Round rotor ...
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