spectastic said:what if the two motors out put aren't exactly the same? wouldn't the motor doing less work slow down the motor doing more work?
what's the reasoning to have 2 motors instead of one?
I've gotten this question a bit. They're identical motors running identical controllers, so they should be reasonably close.
But even if they aren't the same: Both motors are putting work into a shared geartrain (so they're spinning at the same speed at all times) and they're running on separate controllers that aren't even aware of each other. All the controller is ever going to see is "I'm spinning ___ rpm, and the throttle is asking for more power". One might put slightly more work into moving the bike than the other, but they're both putting work in so they'll never really end up fighting each other.
Running two motors allows me to use smaller outrunners that were easier to drive without spending too much on a controller. I'm more comfortable with things that resemble RC stuff, so that's kinda where things went. Also the power density for how small/light these are is pretty insane.
Updates:
Picking up my donor bike tomorrow afternoon. It's a 1995 Kawasaki Ninja 500 that threw the chain and cracked the crankcase. $400 sporty standard with clean paperwork and needs an engine, can't really complain.
Gathered some more parts as well. My motors are in the mail, but my contactor, meanwell's, DC-DC converter, and one of the two kelly controllers are here. I only ordered one of them for now, and I'll grab the other one once I verify that they will run these motors properly. Still waiting on my BMS, gauges, and some other goodies, but once the motors are here I've got all the big stuff at least.
Once I have the bike here I can finally strip it down and get some real measurements off the frame to make the final motor mount and battery pack housing.