Thane Heins Perepiteia.

[CRANKYpants]

@ WEST_ONE CANADAM & A3.0

VIDEO 4 YA - 1 of 3 SHOT TODAY NOT GOING TO WIN ME AN OSCAR BUT MAYBE A RASPBERRY.
http://www.youtube.com/watch?v=SHJOwjQV1lw

CHEERS
Thane

[LarryC]

@ Thane,

Whoa! Now that was brutal acceleration.    Obvious, the rotor has around a 1/8 wobble, unbalanced, but still working great.

Great test, Larry


PS: Does it accelerate the same when HV2 is turned on before HV1?
      What a hoot! slackass99 

[i_ron]

@ WEST_ONE CANADAM & A3.0

VIDEO 4 YA - 1 of 3 SHOT TODAY NOT GOING TO WIN ME AN OSCAR BUT MAYBE A RASPBERRY.
http://www.youtube.com/watch?v=SHJOwjQV1lw

CHEERS
Thane

No raspberrys for you!  Good vid! 

the WEST_WON, (Ron)

[aether22]

Thane, nice work!

I notice that the 53.3 ohm coil does little to accelerate the rotor when shorted, I guess that is because it works better at high speed? it should be pretty straightforward to wind coils with multiple tap points which by using a multi selector switch can be shorted at the best level for each speed.

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)

Also to clarify, about the cogging torque while it is clearly not the main effect you demo it is for sure a component unless you cancel it by stator placement, what happens of course is that the rotor is not as strongly attracted to a steel core electromagnet that is in repulsion as one that is off, the coils field tends to reduce cogging torque. (From what you said on the last page it was not clear if you understood that)

Now on to winding, do you wind them by hand? I guess I will be unless you have something to share. (the shape isn't compatible with drill mounting as far as I can tell)


Addition:
I also notice the voltage on the load jump as you short HV coil 2, but not with 1.
Currently it looks to work only if the HC coil is directly opposite the HV coil. (previously I had assumed the effect was that they were on opposite sides, though it is still possible the effect is a result of rotor tilt)

[CRANKYpants]

Also to clarify, about the cogging torque while it is clearly not the main effect you demo it is for sure a component unless you cancel it by stator placement, what happens of course is that the rotor is not as strongly attracted to a steel core electromagnet that is in repulsion as one that is off, the coils field tends to reduce cogging torque. (From what you said on the last page it was not clear if you understood that)

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).

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.

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