<s>
An	O
air	B-Algorithm
core	I-Algorithm
gauge	I-Algorithm
is	O
a	O
specific	O
type	O
of	O
rotary	B-Algorithm
actuator	I-Algorithm
in	O
an	O
analog	O
display	O
gauge	O
that	O
allows	O
an	O
indicator	O
to	O
rotate	O
a	O
full	O
360	O
degrees	O
.	O
</s>
<s>
The	O
air	B-Algorithm
core	I-Algorithm
gauge	I-Algorithm
is	O
a	O
type	O
of	O
"	O
air-core	O
motor	O
"	O
.	O
</s>
<s>
There	O
are	O
four	O
common	O
types	O
of	O
rotary	B-Algorithm
actuators	I-Algorithm
:	O
</s>
<s>
The	O
air	B-Algorithm
core	I-Algorithm
gauge	I-Algorithm
consists	O
of	O
two	O
independent	O
,	O
perpendicular	O
coils	O
surrounding	O
a	O
hollow	O
chamber	O
.	O
</s>
<s>
A	O
typical	O
air	B-Algorithm
core	I-Algorithm
gauge	I-Algorithm
has	O
four	O
terminals	O
,	O
two	O
for	O
each	O
coil	O
,	O
as	O
shown	O
.	O
</s>
<s>
Air	B-Algorithm
core	I-Algorithm
gauges	I-Algorithm
require	O
special	O
electronics	O
to	O
properly	O
drive	O
the	O
coils	O
.	O
</s>
