Re: OT: Outboard Motor Charging System.

On Thu, 04 Aug 2005 07:30:53 -0700, Eric R Snow <etpm@xxxxxxxxxxx>
wrote:

>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

Oops..... . You're right, it has a series of "pig tails" all around, I
guess alternator is the more accurate term.
.

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