Re: Rectifier/Regulator circuit for an outboard motor?

From: Bill Jeffrey (wjeffrey_at_TAKE-THIS-OUTalum.mit.edu)
Date: 06/09/04 

Date: Wed, 09 Jun 2004 14:06:16 GMT

Sunny wrote:
> Thanks Bill.
>
> The thing that makes least sense
> to me given your theory is that these two wires appear identical, yellow
> with a black stripe, but if one is field and the other is power, they
> should be coded differently - although perhaps the field and power coils
> are interchangeable?
>
> My understanding is the alternator in an outboard differs from a car in
> that there is no rotor winding. The stator sits under the flywheel,
> which contains permanent magnets to induce current in the stator coils.

Both of your points are good, and I don't have answers. I wouldn't
expect the two coils to be interchangable.

A PM-based alternator would certainly work in the sense of producing
power. I just don't know how a regulator would work. If there is 170
volts at full throttle, and the alternator can produce, say, 20 amps,
then a linear regulator that regulates 170 volts down to 14 volts would
dissipate 156V x 20 amps = 3120 watts! That is clearly ludicrous - but
I don't know how else it would regulate if you can't reduce the voltage
via a field coil. Maybe it's like a cycle-counting light dimmer? I'm
not convinced that would work, either.

I guess I'm out of my area of expertise, so I will wish you luck and
fade back into lurking mode.

Bill Jeffrey

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