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A 25 kw toy....I hope

7244 Views 26 Replies 8 Participants Last post by  Amateur
6
So I am building for the second time a bike that, quite frankly might be the death of me. The heart and soul of it consists of
30, 20Ah A123 Prismatic pouch cells. The arrangement goes like this, 1/4 inch plate of aluminum with 4, 1/4 inch lengths of all thread shafts covered buy pvc tubeing. then a single cell followed by a .030 plate of aluminum then another cell and so on. On every sheet of .030 aluminum there is a 1/4 inch long 90° bend to be attached to the heat sink via thermal transfer adhesive. Truth be told this will be the second time that I will build this bike. My biggest concern is that the hub for conventional pedaled bike will not cope with the transmission of 30 horsepower.
It's kinda terrifying when you feel things come loose, at speed.

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Amateur; thanks for your reply! I will look around. I think 34kW peak and 16kW continues would be enough dor my project. Need something of capable of doing Vmax 70-80 mph, but I am more for acceleration as for Vmax.
Anytime! Let me know what you come up with I am looking forward to seeing what you create!
it's the front, the rear is just spring loaded.
what's different to the systems I know (mopeds), is that the clutch is at the rear and not at the front.
Thanks - that makes more sense: they have a centrifugal clutch (strangely at the rear), in addition to the variable pulleys (with the control at the front as it should be). As I recall, snowmobiles just let the belt slip on the input pulley until the engine turns at high enough speed to cause enough clamping force (they even call the pulley control system the "clutch"), and this is much better. That clutch (mounted at either end) is certainly not required - or wanted - with an electric motor. A non-slipping belt-type CVT might work well, keeping the motor in a more useful speed range, although with the right motor it isn't necessary.
An off the shelf CVT (comet 20, 30, 40 series etc) could be modified to more appropriately work with an electric motor. This would be done by modifying the driving pulley of the CVT so that it would simply grip the belt in it's relaxed state. The spacing of the pulley halves is determined by a spacer on the shaft, this would need to be ground/turned on a laithe. Likely a little guess/test would yield the best results! Non slipping CVT's are common in industrial applications as opposed to vehicles.
If any one would like to see the progress one the motor please let me know......

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Neematic clone

As some of you may find out, my last project was literally cut to pieces.
After a loss of inspiration to finish my first project I came across a picture of the a Neematic bike and was floored by it's stunning Beauty. I am particularly captivated by the trellis style frame commonly seen on Ducati motorcycle's.
So here go's round number two.

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Neematic clone

Not to bad for four more hours spent. In total maybe 40 hrs spent in all

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