ridethelightning said:
John in CR said:
Top row in that last pic above is for the YGB set of phases.
many thanks John. thats sorted another hurdle for getting my hubmonster project going! next will be figuring out how to stuff the motor into/underneath the frame i want to use, or re-fab the whole rear section..
If not in wheel I hope you mean on the swingarm as close to the pivot as possible. Mounted on the frame 1. Makes for a noisier chain and 2. Chain pull will act on the suspension much more than typical motorcycles due to the large drive sprocket of small gear reduction, and if you route the chain closer to the pivot then it will make regen act on the suspension more. Mounted to the swingarm gives you anti-squat forces on acceleration and anti-dive during regen just like a hubmotor does, and the effect increases with pivot point height.
My current build for street and trail riding has the HubMonster close enough to the pivot for an effect on unsprung weight of 2.75kg. I'm running 21" moto wheels with a 28t front 57t rear reduction, so it's like my motor weighs less than 3kg and has all that torque and rpm running in a 13" OD wheel. Even and conservative controller settings I get tremendous acceleration up to a max of 87kph without any field weakening with a gearing that will enable it to easily climb anything I have the guts to point the bike up without heat worries. The chain noise is even better than I'd hoped, since these large tires are more quiet than my other bikes, and I still can't hear the chain at all while riding.
I've found using donor frames to be too problematic to fit batteries well, so I prefer to keep a bit of the front of the donor and fab everything else. On my next one I'll lay everything out to get the motor axle either concentric to the pivot or very close to help shorten the wheelbase.