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johnrobholmes · 12.28.2008, 05:09 PM

Back EMF depends on magnet strength, KV, stator construction, air gap, and other factors I am probably not aware of. To generalize, an outrunner gives more feedback EMF because the kv is lower than an inrunner. When you increase the commutation cycles by a factor of 7 (though a higher slot/pole count), generally the construction will allow a reduction of KV by 7 at the same time. Basically the net sum is zero if the inrunner has 7x more geardown as compared to the outrunner.

5 seconds is a lot of time on the cells. That is probably the culprit. You shouldn't be applying heat for more than 2 seconds tops. I get my packs built with one second applications of the iron.

Are you using a gun, or an iron? Got a big tip on there?

	(#8)
johnrobholmes RC-Monster Aluminum Offline Posts: 905 Join Date: Aug 2007	12.28.2008, 05:09 PM Back EMF depends on magnet strength, KV, stator construction, air gap, and other factors I am probably not aware of. To generalize, an outrunner gives more feedback EMF because the kv is lower than an inrunner. When you increase the commutation cycles by a factor of 7 (though a higher slot/pole count), generally the construction will allow a reduction of KV by 7 at the same time. Basically the net sum is zero if the inrunner has 7x more geardown as compared to the outrunner. 5 seconds is a lot of time on the cells. That is probably the culprit. You shouldn't be applying heat for more than 2 seconds tops. I get my packs built with one second applications of the iron. Are you using a gun, or an iron? Got a big tip on there? ---JRH---