[modeleng] Re: An innocent abroad
- From: cbrumbelow@xxxxxxxxxxx
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 19 Dec 2004 23:35:36 +0000
Selected responses, Tim . . . which may raise more questions than they answer.
[Like I told my wife this morning, the only simple answer to a complex question
is "It depends."]
Wire size . . . you want voltage, or current, or some of each? Thick, heavy
wire will have few turns in your coils and deliver low voltage at high current.
And, thin wire does just the opposite. FWIW, an article/series in Live Steam
Sep/Oct and Nov/Dec 1998 on building a three-phase AC turbo generator calls for
26 gauge enamel insulated wire in the field coils and used permags in the
armature. The builder claimed 10 watts at 6 volts at 25,000 rpm.
Series or parallel . . . A DC motor with permag field is self exciting when
used as a generator. Can't remember whether a series wound universal motor
would be self exciting if used in generator fashion. I'm pretty sure putting
the field in parallel with the armiture will require some sort of outside
excitation.
Now my question -- why not put a suitable size permag or universal motor inside
the shell you have acquired?
Charles
-------------- Original message --------------
> I was seduced recently (the Frau Doktor being otherwise engaged) by a set of
> castings for an overtype dynamo. They arrived this morning. Even I have the
> skill (I hope) to whip them under the shaper to turn out something plausible
> but how do the windings go and what size?
>
> So how do I wind the field coils? Both clockwise or one clock and one anti
> clock? What gauge wire do I use? Are they in series or parallel with the
> armature. I plan to tear up a car dynamo for the armature if that helps on
> scale. Any ideas on an old style set of brushes?
MODEL ENGINEERING DISCUSSION LIST.
To UNSUBSCRIBE from this list, send a blank email to,
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.
Other related posts:
