Dia. Mag. Alternator

[DreamThinkBuild]

Excellent work Z.Monkey,

That looks to be a pure labor of love, in the mechanical sense.

[z.monkey]

Thanks DTB,
Electromechanical, LOL!

[z.monkey]

Got the inside of the stator cleaned up and wired the coils to a terminal block.
The coils are wired in series.  Driven with the battery power drill at 1400 RPM,
it produced about 5 Volts open circuit.  Then driven with the Dremmel tool at
30,000 RPM produced about 22 Volts open circuit.  The rotor is slightly out of
balance, and produced considerable vibration at 30,000 RPM.  So, I need to
get the rotor balanced before I try that again...

The voltages are a little better than the DiaMag7, but I think the current is
going to be the real improvement.  There is a lot more pole area on the rotor
which should, in turn, produce more current.  Next task is to build an adequate
load...

[z.monkey]

Dig and you shall receive...

I found this document about shaft and rotor balancing on the interwebz.
It looks very thorough, covers static and dynamic balancing, and even
field balancing, as well as all the math involved.  Since I don't have a shaft
balancing machine I will have to use static balancing to balance the
DiaMag8 rotor.  Basically I need to build a non-magnetic  stand to hold the
ends of the shaft.  The seats where the shaft rides have to be ultra low
friction so the heavy point of the rotor will fall to the bottom.  Then I
can remove a bit on material from the heavy side, and try the balance
again.  This process continues until there is no perceptible heavy spot
on the rotor...

Here is the download page...
http://www.overunity.com/index.php?action=downloads;sa=view;down=481

[z.monkey]

http://scientilosopher.blogspot.com/2011/09/diamag8-test-platform.html

This is a repost.  Nutshelled, got the rotor balanced.  Drill is too slow,
Dremel is too fast.  in the process of building a variable speed alternator test platform...