Commuter Booster - <1kg Friction Drive

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
Folken   10 W

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Re: Commuter Booster - <1kg Friction Drive

Post by Folken » Nov 29 2015 3:42pm

25% not 25 degrees I imagine?
You can try 149kV (63mm, right?), but definitely not with 3s. 6s will be adequate, and you will have a top speed of 35kph, too. High torque will mean your tyre will have a short life.
PS. At these gradients, your speed will be so low that your motor will require some kind of forced cooling (external blower fan?). Unless your hill is really really short.

FlyX   1 µW

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Re: Commuter Booster - <1kg Friction Drive

Post by FlyX » Nov 29 2015 5:02pm

yeah 25% ofc, i dont think that higher S numbers will be beneficial, no way i can climb this hill with more than 20 kph. At lower RPM only the current increases afaik. The hill i quite short, 5 minutes if i walk my bike...

Folken   10 W

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Re: Commuter Booster - <1kg Friction Drive

Post by Folken » Nov 29 2015 5:20pm

If your maximum speed (no-load speed) is 20kph, then your uphill speed will be like 6-8kph. U sure? :lol:

scoobydrew   1 mW

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Re: Commuter Booster - <1kg Friction Drive

Post by scoobydrew » Nov 29 2015 5:36pm

Hi all. Just after some info if you guys don't mind. Will this type of drive work with a tyre like a big apple. My mtb doesn't have suspension and it's a bone shaker on hard road tyres. Looking to add friction drive but fancy some bigger softer tyres to smooth things out :D

Also, thinking of getting an SK3 63mm motor. If I also get an 80amp esc, throttle and servo tester would this combo work?

Many thanks

Andy

Folken   10 W

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Re: Commuter Booster - <1kg Friction Drive

Post by Folken » Nov 29 2015 5:52pm

scoobydrew wrote:Hi all. Just after some info if you guys don't mind. Will this type of drive work with a tyre like a big apple. My mtb doesn't have suspension and it's a bone shaker on hard road tyres. Looking to add friction drive but fancy some bigger softer tyres to smooth things out :D

Also, thinking of getting an SK3 63mm motor. If I also get an 80amp esc, throttle and servo tester would this combo work?

Many thanks

Andy
As long as the motor fits between the tyre and the frame, fat tyres are no problem.

The combo should work, BUT if you don’t want to construct a power-limiting circuit, at least add a power meter to your setup and keep an eye on the power. Or you will eventually BBQ your motor.

scoobydrew   1 mW

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Re: Commuter Booster - <1kg Friction Drive

Post by scoobydrew » Dec 01 2015 7:57am

Thanks for the feedback. Good news re tyre and esc. Hadn't thought about the current limiting requirements however...

I looked at a few posts for this on here and it all seems to be fairly technical and involved - do you know if anyone has 'finalised' a design for one?

As I'm a simple mechanical engineer, maybe just a power meter or ammeter and keeping a close watch will have to suffice :oops:

Thanks

bose   100 W

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Re: Commuter Booster - <1kg Friction Drive

Post by bose » Dec 01 2015 1:00pm

Check out this http://endless-sphere.com/forums/viewforum.php?f=35 part of endless sphere for the VESC open source controller.

The VESC have absolutely everything and anything you need for a friction drive. There are endless possibilities to choose ramping, current/power control etc.

There are several people selling ready made controllers based on the design in the for sale section.

Folken   10 W

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Re: Commuter Booster - <1kg Friction Drive

Post by Folken » Dec 01 2015 9:49pm

scoobydrew wrote: As I'm a simple mechanical engineer, maybe just a power meter or ammeter and keeping a close watch will have to suffice :oops:
Thanks
A simple setup with power meter will get you up and running, and in the meanwhile you can study some hardware and software design to build a system which will suit your needs.

scoobydrew   1 mW

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Re: Commuter Booster - <1kg Friction Drive

Post by scoobydrew » Dec 02 2015 5:02pm

Yep - think you're right. Need to get started and get the build and testing completed ready for spring. I can then look into the VESC at my own leisure. Thanks for the help guys.

artteth   10 mW

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Re: Commuter Booster - <1kg Friction Drive

Post by artteth » Dec 13 2015 4:11am

Does anyone know the torque of the 6374 motor?

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LockH   100 GW

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Re: Commuter Booster - <1kg Friction Drive

Post by LockH » Dec 31 2015 4:54pm

Oooops... Commuter Booster now famous... sort of. Mentioned in DIY pages as seen on ES:
http://www.instructables.com/id/Frictio ... for-bikes/

... with vid on YT:


Hmmm...
ES changed my life (for the waaaaay better).

Eff. June, 2014 Phoenix Ebike Promotions

(Current ride? High speed lawn chair.)
viewtopic.php?f=3&t=57408

Phoenix Ebike Promotions conversion kit (work in progress. More drink holders, etc etc)
viewtopic.php?f=15&t=60564

Joined yer local chapter of EA yet?
(Ebikers Anonymous - Where we're all miserable failures, but the parties are hilarious...)

Audiophiliac   1 µW

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Re: Commuter Booster - <1kg Friction Drive

Post by Audiophiliac » Mar 17 2016 12:09am

Does anyone know if adrian_sm still making the bracket and 'brain box'. I could try myself but too many other projects on the go and would prefer to pay for it, and wait for tried and tested version. Site is still online and sent through and order but not sure if I'll be getting response...

silviasol   10 kW

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Re: Commuter Booster - <1kg Friction Drive

Post by silviasol » Sep 24 2016 10:06am

Awesome kit!
Current project: 10s 20ah sensored goped hoverboard
http://endless-sphere.com/forums/viewto ... 35&t=62155

Folken   10 W

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Re: Commuter Booster - <1kg Friction Drive

Post by Folken » Oct 05 2016 3:50am

Hi guys, has anyone tried grooving their motors? Under high power, the sandpaper periodically comes off my motor, so I was thinking of dumping the sandpaper and machining some grooves on the motor instead. Using milling machine maybe. Any thoughts?

Folken   10 W

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Re: Commuter Booster - <1kg Friction Drive

Post by Folken » Oct 12 2016 3:59am

50mm SK3 cooling fan, anyone? https://pinshape.com/items/27082-3d-pri ... ooling-fan
(I've got a NTM 50-xx variant too).

pabmadiarg   1 µW

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Re: Commuter Booster - <1kg Friction Drive

Post by pabmadiarg » Oct 12 2016 8:22am

Blanthegenius wrote:OK project completed...for now that is. Would like to replace the nylon to black and not sprayed black and complete the profiling so that it's got rounded edges all round, and will probably get some heat treated ali too.
What motor are you using ? On 6S ?

yoyoman   1 kW

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Re: Commuter Booster - <1kg Friction Drive

Post by yoyoman » Aug 24 2017 3:08pm

I bought a used CB with BrainBox, and I just got around to installing it on my folding bike. Everything turned on the first time, and I could cycle thru all the BB settings. I was fiddling around with clicking the button, holding down the button, etc and at one point my motor started spinning. I'm not sure if I let go of the button at that point, or it stopped on its own, but I was satisfied at the time to have the motor running since installation was tricky on my folding bike.

After mounting all the bits and pieces better after my test, now I don't get the friendly beeps when I turn it on. The BB just shows me the fuel gauge, and the throttle button doesn't cycle thru anymore. I checked all the connections, and everything seems like it's in place ...

Has this happened to anyone before?

yoyoman   1 kW

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Re: Commuter Booster - <1kg Friction Drive

Post by yoyoman » Aug 25 2017 12:38pm

OK, I was a dullard and had the thin brainbox to ESC connectors reversed, and apparently one of the throttle pins wires pulled out of the heatshrink.

ah, found the manual ... https://sites.google.com/site/commuterbooster/downloads

lioelec   1 µW

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Re: Commuter Booster - <1kg Friction Drive

Post by lioelec » Feb 14 2018 11:12am

Hello

Good work ! I'm interesting to my folding bike but some question:

-C6374 200kv motor can be waterproof ?
-Why 85A controler we need, can I use this low cost controler 2.4Ghz https://www.ebay.com/itm/Single-Motor-E ... SwTQtaPhVP ?
other SPEC : http://www.diyeboard.com/v11-single-hub ... p-609.html

My Project will be to modified HF remote control to put commands on handlebars.

thanks for you reply

Alecotech   1 µW

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Re: Commuter Booster - <1kg Friction Drive

Post by Alecotech » Apr 18 2018 9:55am

EVTodd wrote:
Nov 10 2010 6:43am
Kepler wrote:I think you have a fair point in relaton to over complication but I suppose it depends on what different people find complicated. I personally find the process of coupling up a roller to a motor just as complicated as making a swing arm for a direct drive setup.
Really? I just drill a hole in the motor shaft and put a roll pin in it. Here's a photo. Doesn't show the pin but in the bottom one you can see where it would go.

Image

As for a picture. Yup, it's an old picture but same old drive I've been making. That top plate doesn't slide, it's to stiffen the small channel aluminum I was using.

Image
adrian_sm wrote: I would be really interested to see what sort of drag your "plain ol' friction drive" has. If it spins down faster than a hub, then personally I would probably just stick with a light weight hub instead. The fact that the variable pressure systems can totally disengage is the only reason I was keen to try it, and the only reason I would put up with some of the down sides of friction drive.
You have a good point about being able to totally disengage the motor. I think you missed the part of my post that said I'm still using a clutch bearing though, so the "plain ol'" version freewheels anyway. I have tried it without and the drag really isn't bad but it would depend on which motor you're using. Never had a hub motor so I can't compare the two.

Don't get me wrong. I'm still using the sliding mount on my main bike. That roller would slip like crazy if I didn't. I'm just talking about low power "assist" type systems.

I think your drive is turning out great btw.

Where did you get your Knurled Friction Drive Rollers with Clutch Bearing? I have been searching for sometime, and can't find anywhere.

Thanks

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