fellow
1 kW
Having 40:1 or 80:1 reduction on a light weight high revving hub (<2.2kg) would be very interesting (market share)!
[youtube]q1v7a0jsp1I[/youtube]
[youtube]q1v7a0jsp1I[/youtube]
spinningmagnets said:Harmonic drives have been discussed before (very well done, BTW), but I have a question. As odd as this may sound, I am wondering if there is any potential to make a similar drive that is only 40:1, rather than 80:1
bazinga....40-1What we have is an internal 40:1 reduction and a secondary 2:1 reduction between the drive unit and crankset
flathill said:Nice kit! Remember folks... the competition for this kit is the EGO from Austria which looks like crap and cost 3000 bucks. Still I would copy their marketing (target demographic). They are now teaming up with redbull and running the first extreme offroad ebike races
If you want to reduce drive noise you need to add elastomer to the frame tube mount. Also offer black anodizing for stealth. Justins FOC controller will also reduce noise and is very compact
recumpence said:flathill said:Nice kit! Remember folks... the competition for this kit is the EGO from Austria which looks like crap and cost 3000 bucks. Still I would copy their marketing (target demographic). They are now teaming up with redbull and running the first extreme offroad ebike races
If you want to reduce drive noise you need to add elastomer to the frame tube mount. Also offer black anodizing for stealth. Justins FOC controller will also reduce noise and is very compact
I agree it is too loud. The noise will not go away with just elastomers. This type of reduction is just noisy. That being said, Cyclone has sold many drives despite the noise.
The quality looks good. Props for the "From scratch" reduction.
Matt
Welcome, Thanks for sharing, and congrats for your successfull prototype, wish you luck for the futuretangentdave said:Here's the guts of the unit, I'd rather not talk about the alterations I've made to adapt the cycloidal reducers to run at 10kRPM and be this tiny for this cost. This is real, it works great. Sorry it's a surprise.
-dave
dirkdiggler said:Is there an option for this drive unit to be used with a more popular motor such as the 80-100? Even better would be a test of the 6364 size motors that are even more common. Likely that size would lack the punch, but would be super stealth. Plus those aren't $400 motors. Might be worthwhile for all the tinkers here to just sell the reduction unit that fits a certain motor shaft size, if that is possible.
whereswally606 said:http://visforvoltage.org/forum/13629-concepts-ebike-propulsion?page=8
post #248 a 1/3 down the page is a good diagram for a dual rotor cycloidal gear reducer. apparently upto 95% efficient according to one youtube clip I watched earlier.
Anyway my hat of to you Dave, excellent execution and as said above can we have one for a 80/100 now please?
tangentdave said:The huge reduction allows for the full 10kRPM range of the Astro, and is it fun. Rated for 1350W continuous, 4000W peak, this thing moves. A Castle Creations HV80 is run sensorless without issues or overheating and can get me started on any hill so long as I can manage to stay on the bike (low gears and a steep hill make for hill climbing fun). The motor has turned several times before the slack is even taken out of the chain- hard riding doesn’t heat the ESC over 120 deg. A Cycle Analyst with shunt provide throttle input (current control) to the ESC. Power is very controllable- I power wheelie that Kona in the pictures in every gear but 10th. The CA allows for easy tuning of the throttle response and power limits.
Range and efficiency are very good.