scottclarke said:Quick update.
Acceleration between 35 and 55mph was just silly fast - really really quick. Going from 55 to 58 took a long time though - a few seconds into this last phase and I felt a hiccup.
Stats for that whole journey show 32.2V minimum (30V niminal pack!), 126A max - making for what was a truly awesome experience consisting of over 4KW of accel
Scott
etard" You have found the pot-o-gold!! congrats!! How much did the pipedream cost? A final part by part tally would be more than gracious.[/quote said:Interesting handle you got there etard.... kinda funny.
I agree, I know Scott has changed a few things here and there and it would be nice to see what was settled on (like the gearing at 24v, lol).
I've started a build of my own based on Scott's setup.
http://www.endless-sphere.com/forums/viewtopic.php?f=6&t=6244
The build is just starting so not much yet, but much more to come.
Kyle
scottclarke said:You have to bear in mind it doesn't have any real accel at less than 20mph. As it is now on 24V it has good fast accel between 25 and 38mph. It is a narrow range but it suits my needs very well. It does require pedalling along with a little effort and gentle throttle use all the way up to 20mph. Or, you could accel REALLY slowly - no pedalling required. I can pedal up to around 33mph with sensible cadence so I will get the fat burning activity I require!
I am not happy with the performance from start to 20mph - thats a fact. Yesterday I had the opportunity to use a fast current logger and it showed spike peaks on the order of 280A. As suspected - this is the reason for the bad low speed performance. Until the motor gets to 3000rpm its basically 'stalled' and draws huge current.
What I would really like to do for a general use version would be to gear it down - say something like 25:1 then bump up the voltage until the current spikes are just below the Jazz's cut-off point (220A it seems from measurements). Geared that way I think it might be possible to have a top speed of 40mph or so with faultless accel.
Thats what I want next - it is very much like my old axi powered scheme which worked fine but drove the pedals.
Thats all on hold now though - as of yesterday I stopped 'developing' this bike. I'll use it as it is.
Scott
P80 Gearbox: Standard Shaft, CIM Mount, 4:1
We recommend maximum torque not exceed 85 ft-lb
Price: $86.25
recumpence said:A planetary would increase his motor length and necessitate a redesign of his system.
Matt
deecanio said:Hi Matt,
i like scotts setup because of the simplicity and tidyness (stealth) but he sais that his speed 0-20 is pretty lame, is that because his motor doesnt kick hard until it gets to a reasonable rpm?
Cheers
D
deecanio said:Is there any motor of similair size that you know of that wouldn't require a massive step down?
recumpence said:Oh, Miles is running a hand made motor. Good luck finding another one. :wink:
Matt
recumpence said:Scotts low end torque issue is more than likely something to do with the small size of his motor and the controller's ability to communicate with the motor (back EMF). I have crazy low end torque with my outrunner (both my expensive Plettenberg and the less costly AXI).
Matt
on long term hold ~ 70% complete - electric velo/nev