Tag added ...

> Based on some searching around, synchronous AC motor seemed to be the mos=
t
> plausible. There are 4 leads. The original circuit has two of them shorte=
d together,
> then switches AC power to one of the remaining leads to make the motor mo=
ve. The
> direction depends on which lead is energized.
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> Naturally the motor hasn't any marking on it, so I'm guessing. If there's=
 another
> type that it might be, I'm open to more investigation!

This sounds rather like the model railway engines I deal with that run on A=
C.

One armature brush is connected to the AC source.

The other armature brush is connected to the centre tap of the field windin=
g

The two ends of the field winding are connected, one at a time to the other=
 side of the AC source, depending on which direction you want the motor to =
run.

I believe this is also the basis of the so-called "universal motor" that ha=
s been used in power tools for a long time, and will run on AC or DC.


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