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What's Wrong with my Diodes? - Page 2

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Posted by Tim Jackson on June 1, 2009, 4:42 pm
m II wrote:

Yes, four poles = two magnets. Whatever. The point is still valid.
Practical small alternators do produce much higher frequencies.

When I was a kid there used to be a lot of war-surplus stuff around
rated at 400Hz, from aircraft systems.  The technology is similar.


Posted by Ulysses on May 30, 2009, 2:50 pm


Yes, it's an inverter type and it appears to me that the reason it is so
effective at low speeds is because of the high input voltage--it seems to
take a lot of load to exceed what the alternator is outputting.  I just
didn't expect it to be as high as it is.  My manual doesn't say anything
about the pricinples of operation.  In any case it works just fine if
connected to it's original inverter, just not when I connect it to my
rectifier circuit.  Time to get some bigger diodes and a much bigger

Posted by z on May 30, 2009, 3:19 pm

Heya Ullyses

I had a look through the repair manual but didn't find anything talking
about raw voltages of the generator or specs that looked like they'd
help.  It just says 'replace' a lot when talking about the inverter etc

Here is a diagram of the eu2000 generator which shows the various
electrical components and how they all get along:


hope that helps & good luck


Posted by Ulysses on May 31, 2009, 3:06 pm

Exciter circuit?  Oh jeeze z you are giving my poor tired brain too much to
think about.  ;-)

If I remember correctly there are 18 coils that are for the 3-phase
alternator output PLUS three more coils that I assumed were for the DC
output.  The description in the manual makes it sound like those three coils
are to power the brains of the eu2000.  Why do you need an exciter for a

Posted by Winston on May 30, 2009, 3:48 pm
 Ulysses wrote:

What do you want to do with the alternator?

I got the sense that you would like it to produce say 120 V.D.C.
for powering lights and small universal motors.  Is that the goal?

 From Zach's scan, it's clear you need to take control of the
exciter winding using a separate regulator.  Use a voltage
divider after your rectifier as a signal to the regulator.

As Tim Jackson implies, please use capacitors that have a voltage
rating in excess of the highest voltage you expect to encounter.

You will have a ~3.5:1 impedance mismatch between the output
of your alternator and your load, so please don't expect full
power output.



We now return you to the economic collapse, already in progress.

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