The Mid Drive Hub Motor Media Group

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bzhwindtalker   1 MW

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The Mid Drive Hub Motor Media Group

Post by bzhwindtalker » Apr 08 2012 1:42pm

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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bzhwindtalker   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by bzhwindtalker » Apr 08 2012 1:56pm

Inspirational build : Buildlog and info
Image

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Whiplash   100 MW

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Re: The Mid Drive Hub Motor Media Group

Post by Whiplash » Apr 08 2012 2:22pm

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!"

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

Tench   100 kW

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Re: The Mid Drive Hub Motor Media Group

Post by Tench » Apr 08 2012 3:24pm

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 http://endless-sphere.com/forums/viewto ... ilit=tench
Project Two http://endless-sphere.com/forums/viewto ... =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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bzhwindtalker   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by bzhwindtalker » Apr 09 2012 4:21am

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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Miles   100 GW

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Re: The Mid Drive Hub Motor Media Group

Post by Miles » Apr 09 2012 4:47am


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Whiplash   100 MW

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Re: The Mid Drive Hub Motor Media Group

Post by Whiplash » Apr 09 2012 8:07am

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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sn0wchyld   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by sn0wchyld » Apr 09 2012 11:36am

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!

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Green Machine   100 kW

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Re: The Mid Drive Hub Motor Media Group

Post by Green Machine » Apr 09 2012 12:13pm

nice thread subscribed!

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bzhwindtalker   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by bzhwindtalker » Apr 12 2012 8:11am



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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sico   100 W

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Re: The Mid Drive Hub Motor Media Group

Post by sico » Apr 12 2012 8:21am

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?


Tench   100 kW

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Re: The Mid Drive Hub Motor Media Group

Post by Tench » Apr 13 2012 2:47pm

Project one http://endless-sphere.com/forums/viewto ... ilit=tench
Project Two http://endless-sphere.com/forums/viewto ... =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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ohzee   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by ohzee » Apr 13 2012 2:48pm

Yea that looks very nice.

flathill   100 kW

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Re: The Mid Drive Hub Motor Media Group

Post by flathill » Apr 13 2012 3:02pm

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 Apr 13 2012 10:29pm, edited 2 times in total.

John in CR   100 GW

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Re: The Mid Drive Hub Motor Media Group

Post by John in CR » Apr 13 2012 7:14pm

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.


John

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Whiplash   100 MW

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Re: The Mid Drive Hub Motor Media Group

Post by Whiplash » Apr 13 2012 7:26pm

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

John in CR   100 GW

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Re: The Mid Drive Hub Motor Media Group

Post by John in CR » Apr 13 2012 8:11pm

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.

jull31   10 µW

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Re: The Mid Drive Hub Motor Media Group

Post by jull31 » Apr 14 2012 3:26am

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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bzhwindtalker   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by bzhwindtalker » Apr 15 2012 2:18pm

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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knoxie   10 MW

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Re: The Mid Drive Hub Motor Media Group

Post by knoxie » Apr 15 2012 2:51pm

:( 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
Electric KMX 72V Lipo, USPD drive unit. BMX 72V, Puma BMC,
Raleigh 26 inch MTB Puma 50V Turnigy 25C Lipo 10AH, Trek MTB, X5 48V NIMH. Electric BMX
http://tinyurl.com/4vrmc8 http://tinyurl.com/3umm4n

Haste   100 W

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Re: The Mid Drive Hub Motor Media Group

Post by Haste » Apr 15 2012 8:38pm

any benefit of using a smaller geared hub motor? Q series or bpm? It would even have more oomph on 48v than a DD...
1997 Marin Hill Hawk. Bafang BPM 2 10T. KU123 30 amp controller. 12s LiPo.=32mph

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Alan B   100 GW

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Re: The Mid Drive Hub Motor Media Group

Post by Alan B » Apr 15 2012 9:26pm

Video blocked for copyright content. :(

Harold in CR   1 MW

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Re: The Mid Drive Hub Motor Media Group

Post by Harold in CR » Apr 15 2012 9:52pm

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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Whiplash   100 MW

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Re: The Mid Drive Hub Motor Media Group

Post by Whiplash » Apr 15 2012 11:23pm

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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