Another Virtual Rotation Thread

[unimmortal]

Hope you don't mind me sharing here Jim - I've just been playing with a small 1/2" version of the 'cross' with two identical lengths of 1mm, ~40 turns each phase crossed over as you have.

Hooked up to separate DMMs to watch the resistance fluctuate as I tapped the ends with magnets, it became pretty clear there's a doorway here. Crossed over centres are essentially caduceus coils, and they are known for infinite resonance.

Pic below is how the coils interact when at rest - I've checked this half a dozen times to be sure (and despite the jungle wiring), one coil is always sitting almost double the resistance of the other. I wonder what this in motion might do?

[Jim Mac]

What do you mean that reading is at rest? You mean while not inducing? 

When I measure mine, my two are the exact same resistance.  But I winded mine ensuring I use the same length of wire and turns on each coil by lapping.   

If you were measuring that without any power going through, I fear you might have a short in one of the coils, or one coil has a lot more wire

[unimmortal]

If you were measuring that without any power going through, I fear you might have a short in one of the coils, or one coil has a lot more wire

Well that was frustrating, re-wound, same issue - alligator leads from the DMM were the culprit in the end.

With a little finesse, bringing little magnets into proximity of two of the arms at the same time, drops both meters to zero resistance at the same time.

[Jim Mac]

If you were measuring that without any power going through, I fear you might have a short in one of the coils, or one coil has a lot more wire

Well that was frustrating, re-wound, same issue - alligator leads from the DMM were the culprit in the end.

With a little finesse, bringing little magnets into proximity of two of the arms at the same time, drops both meters to zero resistance at the same time.

Ahh- yep that'll do it..  But powering them with 2 separate AC phases shifted by 90 will make the magnetic domain in that Tee core rotate.

OK so the Stator is finished.  No shorts thankfully..  IMO, it looks pretty damn good!

   

You can see the rotor print sticking in the middle.  Magnets are not in yet, but you get the idea.  It's looking like this build will finally give me a good 2 phase 90 degree generator.  Fingers crossed..

Note, still may be a few days out, as I am on the bad work shift this week.  But I may get some time

[Jim Mac]

After assembly, the rotor will be difficult to see. So I want to post a pic now before visual access is denied.

The magnets are 20mm X 10mm x 5mm.  Each pole is double-stacked.

   

The magnet sizes look just about perfect for this stator.  I had to use a bench vise to press-fit the magnets in and glue them.  Quite possibly the best rotor I have made to date.

[Jim Mac]

Getting down to the end..  Few more connection parts / spacers coming out then ready to assemble and test. 

   

Might have to print a motor mount to spin this, not sure if my existing ones will be the right height.

[Jim Mac]

WOOHOO!!!!

Let the experimenting begin!

[ovun987]

WOOHOO!!!!

Let the experimenting begin!

LET'S GOOOO!!!!!!! Nice work.

[Jim Mac]

LET'S GOOOO!!!!!!! Nice work.

Thanks Ovun!

Drill spinning this with a Dewalt cordless drill on lowest speed  pushes about 5 AMPS Shorted!  And about 35V Open Circuit Per Phase! This was roughly 400-500 RPM. 

Crazy, I have made generator with HUGE 40mm N52's before and NEVER seen this type of output from a homemade generator before.  Hard to believe 36 small magnets (20mmX10mmX5mm) can create this much energy..  Obviously, the many poles + the closed core really helps output...

I need to be careful because I used 24AWG on the generator coils-  so I don't want to push more than 3/4 an amp out of this.  

So now I found a motor and gear set that should safely power this at around the 500-600 RPM range.

[unimmortal]

The hard work is paying off now Jim! Huge result, congratulations, well done!

AWG24 is good for about 3A