"Wayne.B" <waynebatrecdotboats.TakeThisOut@hotmail.com> wrote in message
news:4bip41t0nrqp5lai524elab5i4n9rs1dpd@4ax.com...
> I have a Galley Maid 12 volt windlass on my trawler. It has a DC
> motor with separate terminals for the field winding (F1, F2) and the
> armature (A1, A2). Measuring the terminal voltages under load, I'm
> getting readings of about 6 volts on each set of terminals. The
> polarity on the armature winding reverses to change rotation
> direction.
>
> My first reaction at seeing 6 volts was that I was getting a lot of
> voltage drop somewhere in the cables, controller box or terminals.
> Now that I take a close look at the controller circuit however, it
> looks like the field and armature windings end up in series instead of
> parallel. If that is in fact the case, 6 volts at each winding would
> be just about right.
>
> Is there anyone here familiar with the normal way of connecting up the
> field and armature windings on DC motors?
This is called a series motor. Shunt (=parallel) motors do also exist, as
well al compound motors which have both. But the wiring method is not
interchangeable. If you have a series motor, you cannot rewire it to be a
shunt motor because the field windings are different for both types. A
series motor has only few fiels windings of thick wire while a shunt motor
has many field windings of thin wire. Applying a series field winding as a
shunt will simply be a short-circuit and blow (hopefully) your fuses.
The advantage of a series motor is a high starting torque, but the
disadvantage is that it runs away with no load, until it explodes into bits.
Meindert
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