The minigen was/is very impressive. Too bad Ed no longer has them available. His description of how to remove the cogging is interesting. Does anyone know if it remotely applies to the SA dynohub?
quote:... The cure is to remove the nut and flip the entire cage over. To do this you'll need to disassemble the unit and un-solder the wires going to the coil. Split the cage halves and remove the coil. Take the bottom cage section and place it on the top cage section and drill the two wire holes using a 3/16" drill. Reassemble the cage and re-install it on the post, solder the wire leads and the cogging issue is gone. Make sure you don't center the fingers on the cage, you want to offset them when you re-assemble it.
Hi Ghurd I think we will just have to disagree on the number of magnets and fingers. If there is the same number of both, all the magnets will try to hold all the fingers & cogging will be very high. If however the number is different as the unit tries to start, some of the magnets will be pulling on the fingers that do not completely line up & so cogging is reduced. On the Minigen ther is 26 magnets & 22 fingers.
Yes Ghurd you are right, I can not count magnets and things correctly. This now only leave the fingers, which I consider should not be parallel sided as an approach to reducing the cogging on the SA units.
Dynohub air core alt
Posted - 03/05/2008 : 20:00:25
