<s>
A	O
permanent	B-Algorithm
magnet	I-Algorithm
synchronous	I-Algorithm
generator	I-Algorithm
is	O
a	O
generator	O
where	O
the	O
excitation	O
field	O
is	O
provided	O
by	O
a	O
permanent	O
magnet	O
instead	O
of	O
a	O
coil	O
.	O
</s>
<s>
Permanent	O
magnet	O
generators	O
(	O
PMGs	O
)	O
or	O
alternators	B-Algorithm
(	O
PMAs	O
)	O
do	O
not	O
require	O
a	O
DC	O
supply	O
for	O
the	O
excitation	O
circuit	O
,	O
nor	O
do	O
they	O
have	O
slip	O
rings	O
and	O
contact	O
brushes	O
.	O
</s>
<s>
In	O
the	O
permanent	O
magnet	O
alternators	B-Algorithm
,	O
the	O
output	O
voltage	O
is	O
directly	O
proportional	O
to	O
the	O
speed	O
.	O
</s>
