9c motor BB drive

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
Post Reply
fume   10 µW

10 µW
Posts: 5
Joined: Sep 09 2013 9:48am

9c motor BB drive

Post by fume » Sep 09 2013 10:54am

This is another build possibility of hub motor mid-driven bike. I was planning it since july and yesterday I got it moving. The direct drive is insanely quiet, its like..wow! how can something so quiet pull you up a steep hill so fast :D its reliable so far and great fun to ride :D but I didnt test it on long ranges, so the future shall show the builds reliability.

-9c 500w/36v
-10 Ah lifepo
-27kg quite heavy..
Attachments
IMG_3416.JPG
IMG_3416.JPG (317.28 KiB) Viewed 3363 times
IMG_3417.JPG
IMG_3417.JPG (319.07 KiB) Viewed 3363 times

User avatar
Wishes   1 kW

1 kW
Posts: 383
Joined: Jun 16 2013 9:29am
Location: Montreal, QC

Re: 9c motor BB drive

Post by Wishes » Sep 09 2013 11:19am

Nice build!!!

Did you put a freewheel on the pedal crank?
Equality is about providing everyone with equal opportunities, it is not about guaranteeing equal results.

1st Build GNG Mid-Drive Kona http://endless-sphere.com/forums/viewto ... 28&t=52029
2nd Build, Stong GT-S210 modified with 5kw hub motor http://endless-sphere.com/forums/viewto ... =7&t=58056

User avatar
Wishes   1 kW

1 kW
Posts: 383
Joined: Jun 16 2013 9:29am
Location: Montreal, QC

Re: 9c motor BB drive

Post by Wishes » Sep 09 2013 11:21am

And it looks like you have it leaning on both of the V's angles? It doesn't try to twist or move under tork?


Wishes
Equality is about providing everyone with equal opportunities, it is not about guaranteeing equal results.

1st Build GNG Mid-Drive Kona http://endless-sphere.com/forums/viewto ... 28&t=52029
2nd Build, Stong GT-S210 modified with 5kw hub motor http://endless-sphere.com/forums/viewto ... =7&t=58056

fume   10 µW

10 µW
Posts: 5
Joined: Sep 09 2013 9:48am

Re: 9c motor BB drive

Post by fume » Sep 09 2013 11:40am

yes, I did put a freewheel there, not on the cranks, but on the motor itself. Like on the picture
And no id doesnt twist, there is approx 2 mm clearance from the Vs, but its 4mm steel, it doesnt move one milimeter under high load.
Attachments
IMG_2664.JPG
IMG_2664.JPG (166.67 KiB) Viewed 1194 times
IMG_2666.JPG
IMG_2666.JPG (165.04 KiB) Viewed 1194 times
Last edited by fume on Sep 09 2013 11:42am, edited 1 time in total.

User avatar
Wishes   1 kW

1 kW
Posts: 383
Joined: Jun 16 2013 9:29am
Location: Montreal, QC

Re: 9c motor BB drive

Post by Wishes » Sep 09 2013 11:42am

fume wrote:yes, I did put a freewheel there, not on the cranks, but on the motor itself. Like on the picture
And no id doesnt twist, there is approx 2 mm clearance from the Vs, but its 4mm steel, it doesnt move one milimeter under high load.
Thanks for the info. Very nice and clean build.

Wishes
Equality is about providing everyone with equal opportunities, it is not about guaranteeing equal results.

1st Build GNG Mid-Drive Kona http://endless-sphere.com/forums/viewto ... 28&t=52029
2nd Build, Stong GT-S210 modified with 5kw hub motor http://endless-sphere.com/forums/viewto ... =7&t=58056

User avatar
ohzee   1 MW

1 MW
Posts: 1719
Joined: Jul 20 2011 1:13pm
Location: Columbus Ohio USA

Re: 9c motor BB drive

Post by ohzee » Sep 09 2013 11:46am

I love the simplicity of this design. It scary at all having the chain between your legs much less the motor.
Nice job love to see video of it running.

fume   10 µW

10 µW
Posts: 5
Joined: Sep 09 2013 9:48am

Re: 9c motor BB drive

Post by fume » Sep 09 2013 11:49am

Thank you :)
Im also curious how much will the torque affect the whole build (freewheel, BB, etc)

Ohzee, thanks. yes its very simple and it was also quite easy to manufacture :)
I wil post a video soon

User avatar
Wishes   1 kW

1 kW
Posts: 383
Joined: Jun 16 2013 9:29am
Location: Montreal, QC

Re: 9c motor BB drive

Post by Wishes » Sep 09 2013 11:53am

fume wrote:Thank you :)
Im also curious how much will the torque affect the whole build (freewheel, BB, etc)
Regular bicycle setup should handle almost 2000 Watts without abnormal wear and tear. And I don't think you are going to be doing jumps with this build, so the BB should be fine ;)

Wishes
Equality is about providing everyone with equal opportunities, it is not about guaranteeing equal results.

1st Build GNG Mid-Drive Kona http://endless-sphere.com/forums/viewto ... 28&t=52029
2nd Build, Stong GT-S210 modified with 5kw hub motor http://endless-sphere.com/forums/viewto ... =7&t=58056

fume   10 µW

10 µW
Posts: 5
Joined: Sep 09 2013 9:48am

Re: 9c motor BB drive

Post by fume » Sep 09 2013 12:04pm

Wishes wrote: Regular bicycle setup should handle almost 2000 Watts without abnormal wear and tear. And I don't think you are going to be doing jumps with this build, so the BB should be fine ;)
2000W? very nice number, I couldnt find any reference on this matter on the internet, so thanks. True, I plan no jumping :D but I plan a suspension fork in the front for this bike, just in case of bumps.

User avatar
spinningmagnets   100 GW

100 GW
Posts: 12425
Joined: Dec 21 2007 10:27pm
Location: Ft Riley, NE Kansas

Re: 9c motor BB drive

Post by spinningmagnets » Sep 09 2013 12:13pm

I've added this to the list of "hub as a non-hub" builds:
http://endless-sphere.com/forums/viewto ... 42#p794542

The Specialized Supercharged custom build was the bike that really captured my imagination (it's a take-off on the factory E-bike name "Specialized Turbo"). I am currently experimenting with a smaller MAC geared hub, because it seems it would be easier to fit to a variety of existing frames.

Conhis makes a very quiet direct-drive (DD) hub that is smaller (and possibly more fittable to small frame triangles) http://www.conhismotor.com/ProductsList.asp?id=113. For a near-silent large diameter DD-hub in the triangle (for a frame that can accept it), I like a narrow front wheel 9C with a low-kV / high turn-count.

http://www.electricbike.com/specialized-super-charged/
Image

User avatar
Wishes   1 kW

1 kW
Posts: 383
Joined: Jun 16 2013 9:29am
Location: Montreal, QC

Re: 9c motor BB drive

Post by Wishes » Sep 09 2013 12:30pm

fume wrote:
Wishes wrote: Regular bicycle setup should handle almost 2000 Watts without abnormal wear and tear. And I don't think you are going to be doing jumps with this build, so the BB should be fine ;)
2000W? very nice number, I couldnt find any reference on this matter on the internet, so thanks. True, I plan no jumping :D but I plan a suspension fork in the front for this bike, just in case of bumps.

That is just my personal experience. Only when i passed 2000 Watts did I start to experience excessive chain, chainring and cassette wear and tear. Under that and everything wears out normally.
Equality is about providing everyone with equal opportunities, it is not about guaranteeing equal results.

1st Build GNG Mid-Drive Kona http://endless-sphere.com/forums/viewto ... 28&t=52029
2nd Build, Stong GT-S210 modified with 5kw hub motor http://endless-sphere.com/forums/viewto ... =7&t=58056

fume   10 µW

10 µW
Posts: 5
Joined: Sep 09 2013 9:48am

Re: 9c motor BB drive

Post by fume » Sep 09 2013 2:31pm

The Specialized Supercharged is obviously a masterpiece in its own category, must have cost much too. But I saw the Bzhwintalkers Project LMX e-bike (better motocros e-cycle) that one amazed me. Its just so reasonably build.
bzhwindtalker wrote:It's indeed looking better this way but finding a good mounting solution was not easy.
I have a chain tensioner and some wiring to finish. I should get my battery box next week, then it's game on :!:
Image

korpin   10 kW

10 kW
Posts: 638
Joined: Sep 18 2011 5:50pm

Re: 9c motor BB drive

Post by korpin » Dec 20 2013 4:10am

fume wrote:yes, I did put a freewheel there, not on the cranks, but on the motor itself. Like on the picture
And no id doesnt twist, there is approx 2 mm clearance from the Vs, but its 4mm steel, it doesnt move one milimeter under high load.
yes but...your pedals turn as fast as the motor when its on correct?...because there is no freewheel on the crank?

never mind...i see its a motorcycle...great design!

User avatar
John Bozi   1 MW

1 MW
Posts: 1892
Joined: Apr 09 2013 1:46am
Location: Brisbane, Australia
Contact:

Re: 9c motor BB drive

Post by John Bozi » Dec 27 2014 5:10am

just to check, we use outrunners (hub motors) because they have lower rpms so need less reduction, also they are quieter right?

Any other reason?

thanks, I'm very interested in building a monster climber.

Would there anyway to get a concentric pivot on these so that the chainline runs cleaner and use big go cart style chains and can bicycle hubs handle say 5kw?

Post Reply