thanks for clearing it up matt, looks like ill have to go with a ebike controller - I'd think it'd be rare for me to ever have high load at low throttle (would trying to start up a steep hill with 25% of WOT be a good example?) but blowing $300 of kit isn't something I can easily afford. a less-likely-to-blow-than-cc-controller for $150 odd is far better in that regard. is it hard to replace fets in the CC controllers?recumpence wrote:That reduction looks good. However, it will be anything but quiet. Gear drives (straight gears) are inherantly noisey and exposed gears wear quickly. I do not mean to criticize, I love the effort and the design. However, I would go with a belt for the primary stage.
The issue with CC controllers is not partial throttle, it is high load with very low throttle. The FETs are overloaded if you pull high loads with low throttle. That is true with most controllers, however. But, with the tiny FETs in the RC controllers, that is more problematic than the huge controllers.
On a side note, does this mean they'd be ok if you slammed the trottle in the same situation that partial throttle would kill it? I know it'd probably leave you on your ass but im curious...
is there a reason not to go with helical gears (arnt they quieter)? do they require a finer degree of allignment/wear faster? or are they simply muchmore expensive?
sorry for the mess of questions...
just answered the last of those questions with good ol' google, looks like its the 'thrust loads' that need to be delt with... perhaps using two facing opposite ways? does that make it notably more complex to build?