Why do you want it to spin out of control?
To your question, it's the total air gap that maters so you choose.
allan down underA life lived in fear is a life half lived.
But if the answer to my question is that it doesn't matter where the stator is in the gap then I will just start moving the second disc out till it raises cut in and speeds up some.Andy[ Parent ]
You need the speed for output, Ed has those magnets on special at the moment why not make it a proper duel rotor. Your origional post indicated increasing the air gap by 1/8" which is a fair bit so that should help a lot, If it was mine I would like to have both gaps even for mechanical clearances, but depending on how you have your stator mounted how easy that is to achieve.
Remember flux density is not linear with distance, for you it's a bit of a suck it and see so give it a go and gain some important data at the very least. We added 1mm to the air gap on my duel rotor for clearance reasons, and that raised the cut in from 140 to 240 rpm, maybe it would produce a tiny bit more if it was lower but I am very happy with it as is.
Oh and let us know the results.
allan down underA life lived in fear is a life half lived.[ Parent ]
If you just increase the air gap you will be back close to where you were before and the thin wire with high resistance will still be a limitation. You may get some sort of compromise that is better than before but you will not gain the full potential.
Regarding the air gap on this set up with magnets on one rotor and not on the other, it is largely the total gap that matters but you will see more increase in speed with the stator nearer the blank disc compared with it near the magnet disc. You need to make coarse adjustments with the total gap but you can get fine adjustment by altering the stator position.
If this is a 12v system, before you make any changes try running it temporarily into 24v if you can find a spare battery. You will likely get far more power with the present winding.
Flux[ Parent ]
