[modeleng] Re: An innocent abroad
- From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Mon, 20 Dec 2004 13:56:06 +0000
Thanks for that.
I'm like Samuel Johnson with dogs walking on hind legs or women preaching: I
don't expect it to be done well but'll surprisded to see it done at all.
The thing about overtype dynamos is that they have a large and conspicuous
set of windings rising above the armature and accordingly I think I need to
make it with windings rather than just use a permanent magnet which I've
done in the past (and which is why I know electrons are blue).
I certainly could just use the brushes from the car dyanamo but one of the
notable features of the old dynamos I've seen is that the brushes look like
brushes. I'm wondering about using a car earth strap and teasing the ends
out but if anyone knows better...
I cert
>From: cbrumbelow@xxxxxxxxxxx
>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
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