> [Original Message]
> From: Ken James <[EMAIL PROTECTED]>
> To: <[email protected]>
> Date: 7/28/2008 1:49:36 AM
> Subject: Re: [Liveaboard] Get Home Motor/Generator
>
> Can you send a schematic of the alternator?
>
Norm - Sorry, I am not aboard to scan the schematic, but it is a standard
two-bearing alternator. It has many stator wires coming out of it and an
instruction sheet detailing how to connect the wires for many
configurations, some of which are: 120/240 "household style" (which is what
I use), 240 single phase, 240 3Ph delta, 240 3Ph wye, and several others.
There are two wires from the exciter stator that are fed by the voltage
regulator (the exciting voltage is around 50-70 volts but I can't recall if
it is ac or DC). The regulator is a small plastic box with an adjusting
screw to trim the output voltage, which also has a sensing input from the
main stator output. There are several other wires used to set up the
regulator.
To use the alternator as a motor I would disconnect the regulator, at least
at first.
> I suspect a lot of the energizing juice is coming
> from back emf.
>
Norm - To start I gather the exciter stator must have some residual
magnetism that sends some power to the exciter rotor thence to the main
rotor and back to the regulator in a boot-strap manner.
> How would you commutate it?
Norm - I don't understand the question.
There is no commutator, it is a brushless alternator, the exciting current
is sent to the main rotor via a the exciter stator, exciter rotor, and
diode array between the exciter rotor and the main rotor.
If you mean "connect it" I would connect the output lines from the shaft
generator to the output lines of the 8KW genset, then slowly raise the
power to the exciter stator with the Variac.
If my genset had three phase output I would set up both for three phase
then connect the two together. This would create a rotating magnetic field
inside the shaft generator. Then I would raise the rotor current with the
Variac so the rotating magnetic field would drag the rotor field around and
around.
-Ken
>
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
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