Dia. Mag. Alternator

[z.monkey]

OK, I have some preliminary numbers from test.

Open circuit Voltage per coil  2.47 Volts AC.

DC Open Circuit Voltage (Both coils rectified and added)  4.30 Volts DC.

1 Bulb Load Current  69 milliAmps.

1 Bulb Load Voltage  3.2 Volts DC.

4 Bulb Load Current  200 milliAmps.

4 Bulb Load Voltage  2.6 Volts DC.

4 Bulbs + 5 Ohm Resistor Load Current  285 milliAmps.

4 Bulbs + 5 Ohm Resistor Load Voltage 1.8 Volts DC.

With these numbers you can start to see how much of a load we can handle.  At half an Amp the Voltage will go down to a Volt.  So, you can see we need more windings.  I am still using my drill to drive DiaMag7, 1400 RPM, 23 Hertz.  We would have better performance numbers if I could run the shaft faster...

[z.monkey]

Lookz at teh numbers...

1 bulb test = 0.22 Watts
4 bulb test = 0.52 Watts
4 bulb + 5 Ohm test = 0.51 Watts

We're using the same 1" inch Magnet...

DiaMag7 peaks at 0.52 Watts...

Its Rotor Dynamics 101, our power output is limited by the Rotor Physics.
We have a small section of Pole on each side, maybe 30 to 45 degrees.
This is all that is influencing the coils, the other 270 to 300 degrees of
the Rotor is wasted.  Hence the concept of a multi-Pole Rotor...

What if my coils are improper?  Should each slot pair should be an individual coil?
Maybe each individual slot coil should have its own rectifier.  Then the rectified power
could be combined in a series parallel configuration to produce the desired
output.  All parallel configuration for Current, and all series configuration
for Voltage, or a combination, but that's a lot of silicon...

Perhaps each slot should be the width of the polar influence, and that is all.  Then
we could determine the number of slot pairs based on the Poles radial width...

This allows the limited Pole space to be utilized more efficiency, by segregated slots...

Also, this begs the application of a multi-Pole Rotor, probably to much expense...

[loosecannon]

z monkey,

still watching this and your mag motor thread with much interest.

if you are looking to spin the alternator faster, how about a trim router with a rheostat?

should be much faster than 1400rpm.
LC

[z.monkey]

The Dremmel tool I have is rated at 30,000 RPM.  That's 500 Hz...
500 Hz. is the limit of an Iron transformer, but the DiaMag7 has no Iron.
Theoretically we can do this, but the winding strategy is wrong at this
point.  I'm going to cut another set of plates, this time on the Palmgren
table, and make DiaMag7-2.  This time with 8 individual coils, 26 AWG
wire, and 8 Schottky rectifiers.  The Voltage should go up due to the
smaller wire.  The Current should go up because of the individual coils
and rectifiers...

A quick note about my coils.  The Poles are only affecting the coils partially.
As it is now, each coil covers about 75 degrees of the radius, but the
Pole is only affecting part of the coil, 30 degrees maybe.  This limits the
potential Voltage because the coils need the Pole currents to make Voltage.
If the coil is wider than the Pole Field, then the extra windings are just
transporting current and not making Voltage.  So, we need to make the
slot coils wider, preferably the width of the optimum Pole currents, and isolate
it from the adjacent slot coils with diodes.  The Voltage will increase because the
slot is wider, and the wire is smaller providing more windings per slot coil.

Gotz to make another drawing.  I have a 3/32" plate, 0.09375", that
I have been planning to use for the next revision.  So it will be, basically,
the same mechanical construct with an electrical modification.  Then
I can adapt my driver spider to fit the Dremmel Tool.  The shaft coupler
set I have has multiple shaft sizes, and I can probably adapt something
that can fit into the Dremmel Tool's Collet...

[z.monkey]

OK, here's the next one, DiaMag7-2.  The slots are wider, went from 0.9375 inch to 0.125 inch.  Also the slots are deeper, went from 1/2 inch to one inch, might not be able to fill them all the way, which is alright.  There are 8 independent 26 AWG coils, and they are spaced 20 degrees apart.  The mounting tabs get 30 degrees of the radius each.  The mounting tabs have been a continuous problem because they are in my winding space.  On the next one, NeoMag8, I will change from outside slots to inside slots to correct this annoyance.  All non-ferrous construction, like the DiaMag7.  Next marking the plates...