The Mid Drive Hub Motor Media Group

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The Mid Drive Hub Motor Media Group

Postby bzhwindtalker » Sun Apr 08, 2012 1:42 pm

Hello to everyone here !
This thread is intended to share media about frame-mounted hub motor systems.
Image
I just got into those systems, but I already built a functional mid drive and I LOVE it!

It's just so versatile, you have the offroad, the fast street bike and the hill climber on a single setup. The weight of the hub is centered and out of the wheel, meaning the suspension performance is not affected by the unsprung weight, and no fancy $$$ built wheel is needed. The gears let you keep the motor in his happy zone, thus getting a better efficiency if you do a lot of stop and go or offroad. Of course, running the motor through another chain means that you will loose a slight amount of power into transmission losses, but bikes chain are something like 98% efficient.

This is what this particular bikes does on 2000w

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Re: The Mid Drive Hub Motor Media Group

Postby bzhwindtalker » Sun Apr 08, 2012 1:56 pm

Inspirational build : Buildlog and info
Image
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Re: The Mid Drive Hub Motor Media Group

Postby Whiplash » Sun Apr 08, 2012 2:22 pm

Love the quote! UNFROCK the possibilities!
Power is a fascinating thing, the more you have, the more you want, but the real power is having the restraint not to use it all at once...............Um...Yeah..

The harder you work.....The luckier you get!!

"People who say it can't be done are often interrupted by those that have already figured out how to do it!"

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Re: The Mid Drive Hub Motor Media Group

Postby Tench » Sun Apr 08, 2012 3:24 pm

I thought i would show my face on this thread and found my bike had got here before me!! :D

Got my order in for a V3 CA, that should really make the bike complete!

Simon.
Project one viewtopic.php?f=28&t=20304&hilit=tench
Project Two viewtopic.php?f=6&t=37489
The uk's first Stealth Bomber

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Re: The Mid Drive Hub Motor Media Group

Postby bzhwindtalker » Mon Apr 09, 2012 4:21 am

Thank you for jumping in Tench! Your build is so clean, I'm jealous of your skill level!

dirt tracker style :
Image


Weather is horrible today, time to clean up a little bit the bike and paint the hub and supports :(
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Re: The Mid Drive Hub Motor Media Group

Postby Miles » Mon Apr 09, 2012 4:47 am

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Re: The Mid Drive Hub Motor Media Group

Postby Whiplash » Mon Apr 09, 2012 8:07 am

Yes, that member "Nader" is where I got the idea for my mid drive but with the bigger motor. His builds are very clean!
Power is a fascinating thing, the more you have, the more you want, but the real power is having the restraint not to use it all at once...............Um...Yeah..

The harder you work.....The luckier you get!!

"People who say it can't be done are often interrupted by those that have already figured out how to do it!"

Email me @ currentcycles@gmail.com
OR check out http://www.CurrentCycles.net
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Re: The Mid Drive Hub Motor Media Group

Postby sn0wchyld » Mon Apr 09, 2012 11:36 am

subbed! lets see some more vids lads!

ive got my heart set on a twin rewound 80100 setup first, but if that doesnt work out its gonna be a oil cooled mac mid drive next!
My builds:
http://endless-sphere.com/forums/viewtopic.php?f=3&t=29373
Norko Aline Park DH - Clyte HT3525 - 24s lipo
http://endless-sphere.com/forums/viewtopic.php?f=28&t=33657&p=534823#p534823
'02ish Avanti D8 - 8085 170kv - 5s 40ah lipo - ple80 recution
http://endless-sphere.com/forums/viewtopic.php?f=12&t=43143
RC Electric mountainboard
http://endless-sphere.com/forums/viewtopic.php?f=35&t=57489
RC longboard with my own CNC routered parts!
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Re: The Mid Drive Hub Motor Media Group

Postby Green Machine » Mon Apr 09, 2012 12:13 pm

nice thread subscribed!
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Re: The Mid Drive Hub Motor Media Group

Postby bzhwindtalker » Thu Apr 12, 2012 8:11 am



This one is quite lame on the riding part but shows my bike and the issues I face too ;) (snapped chains)
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Re: The Mid Drive Hub Motor Media Group

Postby sico » Thu Apr 12, 2012 8:21 am

Awesome video dude ... love how you replace the chain and then jump straight back on :D

Do you think the motor needs a finger/bash/trouser guard, or does it feel safe enough as is?
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Re: The Mid Drive Hub Motor Media Group

Postby Tench » Fri Apr 13, 2012 2:47 pm

Project one viewtopic.php?f=28&t=20304&hilit=tench
Project Two viewtopic.php?f=6&t=37489
The uk's first Stealth Bomber

There is a box inside your head, inside amongst others are the words "Wont fit" stop looking for answers in the box, there are no answers only excuses.
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Re: The Mid Drive Hub Motor Media Group

Postby ohzee » Fri Apr 13, 2012 2:48 pm

Yea that looks very nice.
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Re: The Mid Drive Hub Motor Media Group

Postby flathill » Fri Apr 13, 2012 3:02 pm

Nice work man! You could probably shave some serious weight off these hub motors since they dont need to support the wheel anymore.
Last edited by flathill on Fri Apr 13, 2012 10:29 pm, edited 2 times in total.
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Re: The Mid Drive Hub Motor Media Group

Postby John in CR » Fri Apr 13, 2012 7:14 pm

I'm looking to shorten the axle to save some weight, and more importantly cut down on the maximum width. Both sides are hollow, one for the wires and the other for a shifting rod. The wiring harness is so tight that I'd rather not replace it, so I can't get it too hot in the shortening process. How would you guys cut it? I'm leaning toward short periods with the angle grinder and cool it off.

Also, what about attaching the sprocket? One side is cast iron/steel that extends to the opposite side of the magnet ring. The wire side is a more typical AL cover, though I think I'd want to reinforce it or turn a new thicker one if I drive off of that side. I'm expecting to run 6-10kw peaks depending on voltage.

Lastly, being quiet is important. I'm looking at a 3:2 possible as high as 2:1 reduction, so what chain and sprockets for a budget oriented guy like me?...the 218 stuff LFP swears by? I was even thinking bike chain at least until I'm sure about gearing, but use chainring size sprockets to greatly reduce the torque load.


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Re: The Mid Drive Hub Motor Media Group

Postby Whiplash » Fri Apr 13, 2012 7:26 pm

If you have access to a lathe that's how I do mine. Just tie up the wires and carefully cut till thin enough to break off..
Power is a fascinating thing, the more you have, the more you want, but the real power is having the restraint not to use it all at once...............Um...Yeah..

The harder you work.....The luckier you get!!

"People who say it can't be done are often interrupted by those that have already figured out how to do it!"

Email me @ currentcycles@gmail.com
OR check out http://www.CurrentCycles.net
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Re: The Mid Drive Hub Motor Media Group

Postby John in CR » Fri Apr 13, 2012 8:11 pm

Whiplash wrote:If you have access to a lathe that's how I do mine. Just tie up the wires and carefully cut till thin enough to break off..


If I cut the wires a few inches from the axle, that could work. Thanks for making me revisit the idea of using a lathe. With the phase wires shorted, I might be able to do it just chucking the whole motor in the lathe.
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Re: The Mid Drive Hub Motor Media Group

Postby jull31 » Sat Apr 14, 2012 3:26 am

Motor bafang BPM 500w
Battery 4 zippy 6s for 44.4 V, 10 Ah
Max speed 50 km/h and 5 Wh/km
http://www.youtube.com/watch?v=ESPSq6J0 ... r_embedded
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Re: The Mid Drive Hub Motor Media Group

Postby bzhwindtalker » Sun Apr 15, 2012 2:18 pm

I miss my velomobile... I really can see how nice a mid driven velo would be!

last mid drive vid for a while, you will understand why at the end of the vid :(

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Re: The Mid Drive Hub Motor Media Group

Postby knoxie » Sun Apr 15, 2012 2:51 pm

:( ahh damn what a shame...any chance the frame still has any warranty on it? great bike super agile, hope you get it sorted and get posting more videos soon :D
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Re: The Mid Drive Hub Motor Media Group

Postby Haste » Sun Apr 15, 2012 8:38 pm

any benefit of using a smaller geared hub motor? Q series or bpm? It would even have more oomph on 48v than a DD...
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Re: The Mid Drive Hub Motor Media Group

Postby Alan B » Sun Apr 15, 2012 9:26 pm

Video blocked for copyright content. :(
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Re: The Mid Drive Hub Motor Media Group

Postby Harold in CR » Sun Apr 15, 2012 9:52 pm

American censorship. Video works for me. 8) 8) :lol: :lol:
Thanks to Justin, the forum is open source and NON-commercialized.

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Re: The Mid Drive Hub Motor Media Group

Postby Whiplash » Sun Apr 15, 2012 11:23 pm

Ha typical USofA
Power is a fascinating thing, the more you have, the more you want, but the real power is having the restraint not to use it all at once...............Um...Yeah..

The harder you work.....The luckier you get!!

"People who say it can't be done are often interrupted by those that have already figured out how to do it!"

Email me @ currentcycles@gmail.com
OR check out http://www.CurrentCycles.net
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