hillzofvalp
100 kW
oops
John in CR said:cwah,
An everything to everyone bike isn't possible. Some of your list of wants seems in conflict to me. eg High speed with great torque and foldable to baggage size isn't reasonable even after a 4X improvement in batteries and speed requires more wheelbase. Passenger capable requires wheelbase too, and I think that's in conflict with a stair capable city bike. You need 2 or 3 ebikes.
Price is unknown, but base units will be as low cost as possible, and low labor costs here gives us a competitive advantage over developed world shops. Of course variations with costly exotic materials and/or custom dimensions would be higher priced, but I have too much of a conscience to ever come close to what I consider to be the larcenous prices so common with bicycles. High volume is our goal. Regarding shipping we will work toward cheap shipping at least to N America, but bulk shipments to Europe isn't in the cards at this point. CR exports a lot of bananas and coffee, so if much of that goes straight to Europe, then I could be wrong and relatively small volume crates could be economical.
First are the bikes and getting past the vaporware stage as soon as possible.
John in CR said:Now you need 3:
-an offroad Hanebrink-like bike with a hubmotor using the 2 speed mini that's very light and pedalable
-a mid drive high efficiency trike with power and pedals.
-a faired road rocket with power and speed. Sure it has pedals for legal reasons, but an electronic chain, so the pedals turn a regening small motor, and while it's not a lot of power when riding hard, the vehicle is so efficient thru the air and at the motor that a hundred watts of recharge along with 50-100W continuous charge from the sun does add meaningful range.
John
John in CR said:I'm running mine at 27kw peak input. . . .
John in CR said:I'm running mine at 27kw peak input, and since it's far more efficient, it's like running 11 or 12 BPMs in 52" wheels. I'd put a 2nd BPM, same code, in the front wheel running at a slightly lower current and a much lower phase/battery current limit ratio. That should give you the acceleration you need, and system redundancy so you're never left to leg power alone as long as your battery has juice. With the right current settings that avoid motor cause front loss of traction, or get with MWKeefer about his traction control programming, and you'll have a safer bike to ride, especially in inclement weather, because 2wd is better as long as you keep both wheels on the ground.
Because all the weigh goes to the back wheel at acceleration and you can loose a grip in the front, front wheel spinning faster then the back wheel. Rule of thumb is 70% back 30% front load at acceleration and vice verse at breaking.cwah said:Why do I need less current on the front? I would have put as much current on the front as the back.
jansevr said:im pretty sure hes running 30s so 126v fully charged. so thats around 200 amps to get 27kw. i believe the controllers he is running are the greentime ones. probably 36 fet:
http://www.aliexpress.com/store/pro...shless-speed-controller/313864_522264306.html
at that voltage they would have to be custom fets, maybe 4115?
since the hubmonster is a 6 phase motor he runs 2 controllers. so 100amps each