Re: OT: Outboard Motor Charging System.

On Thu, 04 Aug 2005 03:16:22 -0700, Derek <joe@xxxxxxxxxxx> wrote:

>On Thu, 04 Aug 2005 02:17:52 GMT, Ken Sterling (Ken Sterling) wrote:
>
>>>
>>>
>>Maybe you could just stick a regulator on it????
>>Ken.
>
>Right now I'm looking at connecting a few LM7812, IC
>Voltage regulators in parallel. Each one is good for 1 Amp, and are
>about $1 each. I'll check the manual and see what the magneto is
>capable of pushing out. The down side is that exess voltage is
>converted to heat. The plus side is that when they overheat, they shut
>down till they cool down.
>
>Ideally, I'd rather that excess enery go to the prop., rather than
>creating useless heat.
>
>Thanks.
Greetings Derek,
Is the charging system really a magneto? It would seem that it should
really be a bunch of coils that the magnets go past. A magneto is two
coils, one wound around the other. And when the magnets are at the
proper position the points are opened, the field collapses, and one
coil induces a much larger voltage in the other coil which gives you
the spark. I'm not a real electronics guy but I think a car voltage
regulator would not work because they switch on and off the field
coils that provide the magnetism that generates the voltage. Your
flywheel has permanent magnets so the field strength is always the
same. I wonder if using a resistor in series would waste less energy
that a voltage regulator. Also, for a really simple, robust system, a
zener would probably be better than several LM7812 ICs. I think.
Finally, maybe someone can tell you if a regulator that switches on
and off might be best. I know that the voltage would spike up and down
as the generator is connected and disconnected from the battery but
maybe these spikes would be of such short duration that they would not
harm the battery. I seem to remember a voltage regulator on an old
tractor with permanent magnets in the generator that worked just this
way.
ERS
.

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