Bewo, New Crank-drive Motor

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d8veh   100 GW

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Bewo, New Crank-drive Motor

Post by d8veh » Mar 13 2013 4:28pm

This photo turned up on our UK forum today. This motor is now being fitted to ready-made electric bikes that cost from about £700. It's rated at 250w and anecdotally stronger than a Bosch mid-drive. Looking at the photo, it might be possible to fit it to any bike. It's made by a Chinese company called TCM. I searched, but couldn't find anything about it. Can anybody add to this?
Image

[Moderator edit to add product name to title, also add recent pic to show major internal arrangement, 26:1 single reduction]

https://endless-sphere.com/forums/viewt ... 0#p1151792

Image

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bandaro   10 kW

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Re: New Crank-drive Motor

Post by bandaro » Mar 14 2013 6:11am

Product Specifications
Voltage : 36vDesign : BrushlessWattage : 201 - 300w
Parameters
1.Driver Unit
Rated Voltage: 36V
Rated Power: 180~250W
Max Speed: 90r/min
Peak Torque: 60N•m
Noise:≤50dB
Temperature: -25℃~50℃
Weight:≤4.5kg
Water Proof Grade: IP54
Standard: EN15194-2009、ROHS
Range: 40km(with only power and 36V/9Ah lithium battery)
Climbing Angle: 6º
2.Electric Control System
Driver: DC brushless controller
Assistance Meter: LCD/LED
Speed Sensor: One Signal
Assistance Sensor: Inside
Assistance Control Mode: Speed Control, Power Control, Proportional Control

Best I could find, seems like a very simple low power drive, will be interesting to see if there is room on the market for it.

krembuk   1 µW

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Re: New Crank-drive Motor

Post by krembuk » Aug 14 2013 12:06pm

http://www.tjbewo.com/En/CMS.aspx?cid=3

For USD 177, it is quite tempting. But can it install into any kind of bike?
http://stepinternational.en.made-in-chi ... Cycle.html

IMHO, the Bafang BBS01 is a safer choice....

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Re: New Crank-drive Motor

Post by kfong » Aug 14 2013 12:11pm

Nice to see more mid drives available at low cost.

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jateureka   10 kW

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Re: New Crank-drive Motor

Post by jateureka » Aug 15 2013 5:06am

[quote="krembuk]... can it install into any kind of bike?....[/quote]

According to the first link you posted "...The mid-drive system can be installed onto almost all types of bicycles. The installation is very easy..."
E-bikes: Bafang 8FUN; Mac; Ezee; FreeGo; Aprilia 7s LiPo; eLation V2; TerraTrike recumbent
E-motorbikes: ZEV 7100 LR scooter, 84V 60Ah LiFePO4.
ZERO 2011 S motorcycle, 51.8V 70Ah LiMno2, 2012 headlight, Kilovac EV-200 contactor
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deffx   100 W

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Re: New Crank-drive Motor

Post by deffx » Aug 15 2013 7:49am

I emailed them and enquired if this can be installed on a normal 68mm bottom bracket, the reply was

"For Middle Motor, it can not installed on a normal bottom bracket. Before in china has a company can do it, but find a lot of problem, so they give up it. So no one can do the Middle Motor installed on a normal BB so far.

Our Middle Motor can installed on the BB which Inner Diameter is 38mm, External Diameter is 47mm, Length is 61mm."


Bit stupid of them really, Bafang/8fun bbs01 is similar and fits a standard bike, they missed out on a potental market

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Whiplash   100 MW

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Re: New Crank-drive Motor

Post by Whiplash » Aug 15 2013 8:36am

I would bet with a little modification you could make this work but it would only make sense if it'll handle more power. If it could do say 800-1000 watts it might be worth the effort.. Maybe at higher voltage?
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!!

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jateureka   10 kW

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Re: New Crank-drive Motor

Post by jateureka » Aug 15 2013 3:39pm

You can buy the complete e-bike on ebay here in Aus: http://www.ebay.com.au/itm/221162097220 ... 371wt_1130

Here is a link to the sellers web page with more details http://www.justride.com.au/our-portfoli ... or-system/

I have not seen that crank drive sold as a conversion kit. All the pics I've seen have been of complete e-bikes with the motor behind the seatpost, but not all bicycles would have enough room to do that and I don't know if it can be mounted with the motor out front.
E-bikes: Bafang 8FUN; Mac; Ezee; FreeGo; Aprilia 7s LiPo; eLation V2; TerraTrike recumbent
E-motorbikes: ZEV 7100 LR scooter, 84V 60Ah LiFePO4.
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speedmd   100 MW

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Re: New Crank-drive Motor

Post by speedmd » Aug 15 2013 3:54pm

motor behind the seatpost
Most likely to eliminate the need to to clamp it in place. No other reason I can see to keep it from going in front.


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speedmd   100 MW

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Re: New Crank-drive Motor

Post by speedmd » Aug 18 2013 7:56pm

One of the links has it as fitting into standard english 68mm -72mm bb shells. Should be widely adaptable as it does not look to rely on shell treads.

athletic91   100 W

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Re: New Crank-drive Motor

Post by athletic91 » Aug 23 2013 10:52am

Anyone manage to make contact with the supplier shanghai yixin? They don't reply to messages on alibaba
My light weight Commuter CUTE100CST
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speedmd   100 MW

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Re: New Crank-drive Motor

Post by speedmd » Aug 23 2013 12:33pm

athletic91 wrote:Anyone manage to make contact with the supplier shanghai yixin? They don't reply to messages on alibaba
They only have 1.3 billion local customers that speak the native language. Think they may be a bit busy with walk in's if they introduced something marketable. :)

d8veh   100 GW

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Re: New Crank-drive Motor

Post by d8veh » Aug 23 2013 5:08pm

I spoke with them when I was in China, where they told me that they were working on one that could be fitted to a standard BB. There's two pins on the inner flange that prevent it from turning with torque, so you have to file two slots in the BB. We discussed alternative ways of effecting the anti-rotation.

I had a bike with this motor on test for a couple of weeks. It wasn't particularly powerful, but could climb well slowly in bottom gear. I fitted another controller and increased the current to 24 amps at 36v. It must have been saturated because it made no difference in power output from when it was 18 amps. There was a small increase in power from the standard 14 amps to 18 amps.

Cinelab   10 µW

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Re: New Crank-drive Motor

Post by Cinelab » Oct 19 2014 8:29am

What about pricing?

Can you provide your buying channel?

THX

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KINNINVIEKID   1 kW

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Re: New Crank-drive Motor

Post by KINNINVIEKID » Oct 19 2014 8:56am

d8veh wrote:I spoke with them when I was in China, where they told me that they were working on one that could be fitted to a standard BB. There's two pins on the inner flange that prevent it from turning with torque, so you have to file two slots in the BB. We discussed alternative ways of effecting the anti-rotation.

I had a bike with this motor on test for a couple of weeks. It wasn't particularly powerful, but could climb well slowly in bottom gear. I fitted another controller and increased the current to 24 amps at 36v. It must have been saturated because it made no difference in power output from when it was 18 amps. There was a small increase in power from the standard 14 amps to 18 amps.
Anti rotation is now by a plate bolted to the final drive cover and through the frame where you would normally bolt a kickstand.
Also a toothed washer under the BB nut.
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Re: New Crank-drive Motor

Post by bht » Nov 06 2014 8:53am


dirkdiggler   10 kW

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Re: New Crank-drive Motor

Post by dirkdiggler » Nov 06 2014 5:24pm

I've always thought that this kit looks an interesting one to mod. Slap a larger 80/100 motor on that and see how things hold up. It lacks the power for me at 250w and the Bafang looks to be better built. I am interested in feedback from anyone that has used this kit. I wonder if they sell it without motor and controller?

dirkdiggler   10 kW

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Re: New Crank-drive Motor

Post by dirkdiggler » Nov 09 2014 12:41pm

Not that good. It looks like all you need to do is bolt on your motor of choice and use the correct spur gear. Might have to get an adapter plate. Would be good to be able to use a 80-100 size RC motor. That is why I said it looks to be easy to mod. Not internal controller that you have to worry about. I'd like to hear about the quality of the kit and how the motor does. If it can handle some over-volting, it could be a nice product.

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tomjasz   10 GW

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Re: New Crank-drive Motor

Post by tomjasz » Nov 20 2014 10:29pm

Thanks I am enjoying following your build. Have youe seen a hHeadway battery case for a inside frame installation?

Never mind, found them. Anyone use this group?

http://www.alibaba.com/product-detail/H ... 15420.html

This 36v 10ah isn't crazy heavy...
http://www.battery-energy.net/product_1 ... -bike.html
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

bgt   10 W

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Re: New Crank-drive Motor

Post by bgt » Dec 07 2014 6:31am

Whats the best place to order it from. I am in the Netherlands so maybe BEWO has a subdealer in Germany?
Anyone?

PS I have 2 off Bafang BBS-01/250W to compare to so I am interested to see the real differences.
Bike: Batavus Mamboo
Motor: BBS02B-500W
Battery: 2x 20Ah/36V Dolphin
Folding Bike: Batavus Intro Versa + another 1
Motor: BBS01-250W...........2 off.
Battery:

cwah   10 GW

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Re: New Crank-drive Motor

Post by cwah » Dec 07 2014 8:27am

how does it compare to the bbs02?
Help me find my stolen electric brompton: http://bit.ly/1a0vbBC and Bosch Sinus B3 http://bit.ly/1eV0WQz

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tomjasz   10 GW

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Re: New Crank-drive Motor

Post by tomjasz » Dec 08 2014 2:34am

Your post seems to imply Bafang hasn't done testing up to par with bewo. I think that is not fair. Maybe it's just our language differences, and I' not reading your remarks correctly. But honestly I like the construction and installation of the Bafang better.
However I am impressed by your build and your skill in configuring your bike. You are obviously a very talented fellow. There haven't been a lot of bewo kit installed or written about to determine just how reliable it, bewo, will be. My BBS01 350W is definitely every bit as good of a performance, and actually a bit faster. You have made me very curious about headway batteries. I think I may use them when I get to my tricycle build, where the weight may be an advantage. I'm looking forward to your expert technical analysis of electrical performance.

Ride safe,

Tom

CORRECTION my top speed is just about the same on one bike 32kPH, the other 35KPH. Not sure why same model of bike same wheel size

I do not wish to go any faster with the bike the motors are now on. I'm happy to not have the 48V version.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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Re: New Crank-drive Motor

Post by cjh » Dec 08 2014 7:30am

Kiriakos GR, could you please tell me the depth of this nut?
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cwah   10 GW

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Re: New Crank-drive Motor

Post by cwah » Dec 08 2014 7:43am

Kiriakos GR wrote:
Bafang VS BEWO comparison regarding top speed is not possible when BEWO using just a 250W motor (350W peak).

Bafang VS BEWO comparison regarding robustness is possible, Bafang using plastic gears and availability of spare parts is tremendously poor and parts are overpriced.
top speed performance is indeed dependent on the controller and voltage.

But efficiency comparison is more than possible. Try both on same speed on hill climbing and maybe constant 25mph on flat. See consumption for both. Find out the winner.
Help me find my stolen electric brompton: http://bit.ly/1a0vbBC and Bosch Sinus B3 http://bit.ly/1eV0WQz

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