(05-31-2024, 02:04 PM)Uniongarage Wrote: I know you already have them , a alternative cheap source of a set up like what you have is radiator fan motors out of cars. The shaft size is a lot smaller and would be easier to mount on a small bearing or bushing. I come across all sorts of different dc motors working on cars with permanent magnets. Are you near any You pull it salvage yards ? They are treasure chest of cheap parts for experiments. Good Luck ! Let me know if there is any specifics of type of rotor or stator references I could help source related to automotive.
Thanks man. There is a few scrap yards, but for the effort, this thing costed me $19. If it works and I need a pile of them, I may make the trip. But if I go to a scrap yard, I will spend all day pulling as many as I can.
Update- The cogging problem is practically eliminated! As others suggested, the answer is staggering the bolts to magnets in such a way where when 1 pair is at the sticky spot, the other pair is at the pull-in spot.
With 6 magnets, if I use 2 bolts it Coggs like a MOFO. But 6 magnets with 4 bolts- Smooth Sailing! I need to try more combinations, but this is nice progress!
Here is the pattern:
Same basic concept as creating 90 degree phases. When one is at peak, another is at zero. There are many more combinations that should work also.
Now to think about the stator. Just using a magnet probably won't work. Although the bolts have no polarity at TDC, a stator magnet will attract to them and make a sticky spot. I think I have to use a similar technique to turn the magnetic polarity On and Off in the stator magnet.