Re: advanced charger and outboard motor

Graham Bowers wrote:
> Ron Jones wrote:
>
>> Most o/b of that size are just a lighting coil, with (if you are
>> lucky) a rectifier. (I know of a Honda 8 and 9.9 that was like that
>> - thus you get a max of 2 amps!), later models (and I mean not more
>> than about 5 years old or so) will give *up* to 6-8 amps - at
>> *speed* - a friend with a Water Rat and a Honda 10, gets about 4-5
>> amps at best on the cut. But these are all fixed (motorcycle style)
>> alternators - i.e. a permanent (rotating) magnet and a large set of
>> stator coils - you can't adjust the output - it varies with engine
>> speed - car alternators use an electromagnet, the flux of which can
>> be adjusted by varying the power to the field coils.
>
> Ron
> Having studied the wiring diagram I see it has a permanent magnet type
> alternator, as you say. Spec is 6 Amps. There is a regulator, but it
> is probably zener based.
> Cheers
> Graham

Almost certainly a zener - just dumps excess voltage as heat - care if you
can up the coils - the zener (and it's heat sink) may not be able to cope
with the extra load - you may need to get a bigger zener - depends on how
fast the o/b is run, at 4mph you may not get to 6amp with the bigger coils!
That would also up your fuel consumption a bit, as this type of system is
always set to make full power, either to the battery or to heat.
I once saw an article, years ago, where someone had strapped a car
alternotor to the side of the outbopad and addded pully and drive belt ,
IIRC took off the emergency start pull cord hub, and bolted a pully on -
then added slots in the case to run the belt through, but one has to
remember that a big alternator will need some HP to drive it [as well as the
prop!]

--
--
Ron Jones

Don't repeat history, see unreported near misses in chemical lab/plant
at http://www.crhf.org.uk
Only two things are certain: The universe and human stupidity; and I'm
not certain about the universe. ~ Albert Einstein


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Relevant Pages

  • Re: XS650 ROTOR
    ... When I first suggested using a permanent magnetor alternator what I had ... number of coils in each winding and the flux density of the magnets. ... possible to get more voltage. ... The engine ran and put out a lot of power, ...
    (rec.motorcycles.tech)
  • Re: Alternator.
    ... dynamos is that they use coils everywhere instead of having ... regulated - so the regulator isn't dumping excess power, ... instead of permanent magnets as a means of controlling output. ... whereas an alternator uses just a voltage regulator. ...
    (uk.rec.cars.maintenance)
  • Re: Rectifier/Regulator circuit for an outboard motor?
    ... > which contains permanent magnets to induce current in the stator coils. ... A PM-based alternator would certainly work in the sense of producing ... then a linear regulator that regulates 170 volts down to 14 volts would ... Bill Jeffrey ...
    (sci.electronics.repair)
  • Re: A Coil With Taps For Phases ??
    ... it's just an ordinary alternator with the coils around the ... > stator, rather than in slots. ... > part of each coil doesn't cut much flux, but a multiphase alternator ...
    (sci.electronics.basics)
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