Dia. Mag. Alternator

[nievesoliveras]

Those coils seem configured as a Joule thief coil. With a center tap.

[z.monkey]

The new windings are producing 0.73 Volts open circuit.  A little lower than expected.  Looks like I chose wire that is a bit bigger than what I needed.  Mark had suggested that I use a step up transformer in this situation.  So I have a 10:1 step down transformer that I hooked up backwards to make it step up.  The open circuit output from the transformer is 9.5 Volts.  When I add the 65 Ohm resistor the voltage drops to 2.94 Volts, which is 45 milliAmps, and about 1/8 of a watt.  Testing with the same drill, 1400 RPM, 23 Hertz.

So, that was a step in the wrong direction...

Anyway, kind of at an impasse here.  I'll let it fester in my subconscious for a while and see what gets regurgitated in a couple of days...

Got to get ready for Thanksgiving in the meantime...

[nievesoliveras]

Just for experimenting you can attach a joule thief circuit to the coils as they are now and see how much voltage you get out.

I think you know this already. Just in case the center tap of the two coils go to the positive and the other wires one goes to the transistor base through a resistor and the other to the transistor colector.

Jesus

[wattsup]

Hi @Z

Always good to see your works. Great workmanship.

Maybe a few points to consider.

@MK showed you a microwave oven fan motor. Those motors work because there is a slit cut into the lamination so it will work with AC. Also they have a rotor that has angled laminations to keep the rotation going.

The other thing is those bolts you are using to hold your laminations together. If they are steel, then then can play havoc on flux movement. Maybe look for some aluminum bolts. But it seems that there are many bolts that are very bulky. Imagine flux is bouncing off those bolts.

Last thing is the coil wires coming out to only three terminals where you have two soldered together. You are better to use 4 terminals then you can play with the wiring in different ways for your tests. Series, parallel, opposing, etc.

[z.monkey]

Jesus, I hadn't thought about using the JT in conjunction with the DiaMag6.  I need to explore the JT first.  What are the part numbers for the diode and transistor?

Wattsup, I have of set of brass bolts (non-ferrous) and can swap those in there.  But the brass is soft compared to the steel, and the bolts get chewed up when I put them in and take them out.  There is a pile of brass filings under the thing every time I move them.  I feel like the steel bolts are OK because this is not a signal transformer.  Eddy currents cause performance issues in signal transformers, but here the magnets are telling everybody what to do.  I have spent a lot of time contemplating my mag field issues, and probably have more work to do there.  Also the windings are wound to be in series, and that is why they are connected in the middle.

About the poor electrical performance, which is mag field related, there is something I forgot to add.  If you look at the raw core, we have two E cores back to back.  The "I"'s are missing, like an EI core.  The reason EI cores are efficient is they have a complete flux path around the coils.  In the case of the DiaMag6 core the flux return pathways (I's) are missing.  That would reduce efficiency and overall performance.  I think I can make something with some bar stock to fill that gap...

Thanks for the helps, Y'all...