I tried the 4 mag/ 6 pole approach and it does reduce cogging over a 6 mag/6 pole arrangement if the mags are close such as you have in your last pic. But you have the disadvantage of 1/3 of your coils doing nothing at any given point in time. I was impressed that on the white fan using a total of 12 neos (2 ea per pole X 6 poles ; 1 X 1/2 X 1/8 inch neos) I only ended up with about 1.25 oz ft of cogging - can easily be turned using only thumb and index finger. But then I think the gap from the mags to the stator is about 4 MM.
You havent given any details about the resistance of the windings (or maybe I missed it) but if you are able to light up a standard 12 V tail light bulb the windings must be fairly low in resistance. Almost looks like awg 24 wire on the stator.
John[ Parent ]
I wish I had some different magnets so I could try 6 on the armature but as you can see there's not much room left using 4.
I unwrapped one of the original windings and that one was indeed 3 in hand, about 96 turns, different figures from all my meters but looks to be about .3 ohm. These are about 27ga, 26ga, and maybe 26.5ga? Shorting the meter reads .5 ohm with meter leads and alligator test leads. Then to the coil for a total of .8 ohm.
I wrapped the empty pole with some old coils from a tube yoke from an old monitor, 4 in hand, 27 ga or so, 100 turns and that came out to .5 ohm but haven't done any spin tests yet.
The 15v and lighting the tail light was using 2 of the coils, the 12 and 6 oclock and like I said, not sure about the rpm. zap[ Parent ]
