Thane Heins Perepiteia.

[aether22]

YOUR STATEMENT IMPLIES THAT YOU STILL ARE AN "OLD DOG..." - UNLESS I AM WRONG HV COILS DO NOT CREATE REPULSION AS PER A HC COIL - AND WITH A HC COIL YOU HAVE REPULSION - THEN COGGING - THEN ATTRACTION (AS THE MAGNET TRIES TO MOVE AWAY).

Well there are a few issues here, quite a few.
First we know that the HV coil does have a current and creates a significant MMF, the phase of that has not been analyzed but if it were working conventionally then it would be between 90 and 180 degrees behind the rotors phase, since it is shorted it will be closer to 180 and hence have less Lenz force, however it would still create a repulsion force that due to the attraction of the rotor to the stator core acts to lessen cogging torque.

Now it may be (although I have real doubts, but I can easily test it) that the stator coils field is such that it is outside the normal and is sat at 189 degrees say, now this would not appear to make sense however, if that were so then the cogging torque could be increased by shorting, however I have observed the cogging torque rattle to decrease immediately on shorting although I'll grant you that is far from bulletproof.

And I'd like to make it clear that for any who may doubt Thanes effect has far surpassed any possibility of being a result of various losses.

I WOULD NEVER SAY THAT THE REPULSION FIELD CANCELS THE COGGING TORQUE - THAT WOULD BE LIKE REPLACING SOMETHING BAD WITH SOMETHING WORSE - LIKE REPLACING PB WITH OUmonotony.

Starting to sound like semantics, but if you have a non energized electromagnet and place a permanent magnet near it will attract, if you energize the electromagnet to oppose the magnets field then you can turn off the attraction or even create a repulsion, a pickup coil will not under and normal circumstance be able to turn attraction into a repulsion but it can lessen an attractive force.

BTW - I AM UPLOADING ANOTHER RE-SHOOT OF THE SAME VIDEO (SANS NARRATION) WITH THE I/P REDUCED SLIGHTLY BECAUSE THE HC COIL DECELERATION WAS NOT CLEAR ENOUGH FOR MY LIKING - AS I WAS OPPERATING THE MOTOR IN THE WRONG "ZONE"..

T

Nice.

I have Just finished a multitap coil wound on a split MOT core.

[CRANKYpants]

Also I note that you have no longer got the HV coils magnetically shorted through each other, have you found that closing the flux path may not be needed after all? I am currently replicating the coils and was just about to JB weld them to some I bars so the 2 halves of the core are stuck on each other, would you now recommend not going with the back iron flux shorting for the most energetic acceleration? (or is it not needed now you have gone for 5! stack rotors? Still I recommend closing flux paths if you can since it reduces core losses in laminated cores)

CLOSING THE FLUX PATH INCREASES THE EFFECT - BUT THIS SETUP IS FOR QUICK COIL TESTING.

BACK IRON REDUCES AIR GAP RELUCTANCE AND I WOULD EMPLOY IT WHERE WEIGHT IS NOT AN ISSUE.

T

[CRANKYpants]

but if you have a non energized electromagnet and place a permanent magnet near it will attract, if you energize the electromagnet to oppose the magnets field then you can turn off the attraction or even create a repulsion

WHAT HAPPENS IF YOU HAVE A HV COIL ELECTROMAGNET - WILL IT REPEL THE PM?
CAN YOU TRY THIS TODAY WITH A HC COIL, HV COIL AND DC?

I WILL AS WELL IF I HAVE TIME...

1) PULSE DC THROUGH A HC COIL AND ATTRACT THE MAGNET.
2) PULSE (THE SAME) DC THROUGH A HV COIL (SAME TURNS DIRECTION) AND WHAT HAPPENS TO THE MAGNET?
3) PUT THE COIL AND MAGNET ON A RULER SCALED PAPER TO GUAGE DIFFERENT FIELD STRENGTHS AS WELL.

T

[aether22]

WHAT HAPPENS IF YOU HAVE A HV COIL ELECTROMAGNET - WILL IT REPEL THE PM?
CAN YOU TRY THIS TODAY WITH A HC COIL, HV COIL AND DC?

I WILL AS WELL IF I HAVE TIME...

1) PULSE DC THROUGH A HC COIL AND ATTRACT THE MAGNET.
2) PULSE (NOT THE SAME) DC THROUGH A HV COIL (SAME TURNS DIRECTION) AND WHAT HAPPENS TO THE MAGNET?
3) PUT THE COIL AND MAGNET ON A RULER SCALED PAPER TO GUAGE DIFFERENT FIELD STRENGTHS AS WELL.

T

In the HV case you need to apply as many times voltage as there are turns compared to the HC coil.
So if the HC coil is 100 turns and you apply 10v, and the HV coil is 1,500 turns then you must apply 150v across it. (that is how it in the generator, 10 times the turns will have 10 times the induced voltage)

[CRANKYpants]

I have observed the cogging torque rattle to decrease immediately on shorting although I'll grant you that is far from bulletproof.

COGGING TORQUE RATTLE DECREASES w/ INCREASED SPEED AS WELL - IS THIS WHAT IS OCCURING?

AT ANY RATE THE NEW VIDEOS ARE UPLOADED BUT NOT PROCESSED YET - GOTTA RUN.

CHEERS
Thane