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Author Topic: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University  (Read 21929 times)

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Online Kiriakos GR

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For some time I was thinking to convert my bicycle in to ebike.
Mostly so to remove some weight from my motorcycle this is in use daily for any of my transportations.
Especially in Greece in which the weather helps allot, one ebike can show as great choice.

When started my inquiry to discover which KIT seems as better over all option for me, I discovered one foggy market, loaded with KIT which their robustness in long term is very questionable, and the same goes regarding spare parts.

While young kids are incapable to understand how many things can go wrong in one ebike setup, and how fragile one such KIT could be, they do close their eyes in most warnings and buy what ever seems that is capable to transform their bicycle in to something else, which in their imagination could seems like an self moving dream-machine over two wheels.

Personally by discovering from other people feedback that hub motors is a source of evil, mostly because they overheat and this causes the death of their hall sensors, I got very puzzled.
Another severe issue by large proximity to happen, is their axel due the slightest miss use to bend and this starts to slowdown the wheel, and even to destroy their what-ever power efficiency.

Regarding small in dimensions hub motor with gyroscopic gears, those seems to be sold everywhere but the gears system is made by hard plastic, and such spare parts seems almost invisible in the market.

The next possible selection by removing the idea of a hub motor from my head is naturally the Mid-drive system.
The problem even in this case is how to select one product solution that will shown reliability in long term?
Bafang seems as Asian copy of Mid–drive systems which are distributed in North Europe by German and other vendors.
While it seems as less experimental design compared to other ones, one in depth look at the inner parts of one Bafang motor will show that many small and fragile parts are in use.
The question of what is happening regarding spare parts is rising again, my inquiry show poor to none after sales service, and a single plastic gear has 40$ FOB in China.
 
   

By discovering BEWO so to inquire and find details of their KIT, in my surprise their KIT includes only metallic parts that seem nicely engineered and robust.
This topic is here to serve as a place in which I am going to share my experiences about this very fresh KIT, with my readers and visitors.
This KIT was paid in full, and therefore I am not obligated to do any favors to BEWO, but from the other hand if this KIT shown as worthy to me, it would be my pleasure to share the good news with any one interested.

Currently I am in the second stage of this project.
The first one was buying and waits for the arrival of several other parts of my choice for this project.

For now I will just add pictures to this topic of parts and of my progress about assembling it, and as soon is ready, electrical measurements and verification of how well behaves in the street will follow.

The KIT is totally waterproof, comes with digital display (controller) which communicates with the motor controller with serial communication.
It is like two micro-computers talking its other all the time.
The system has 9 PASS levels all adjustable by the use of this display controller.

Currently I am extremely impressed of the over parts quality found in this KIT. The brake levers with the cut off switch are aluminium and higher quality than the ones which my average priced bicycle was had by default.
The wires harness looks pretty good.
The motor controller box is made by aluminium.
Motor specifications:  36V 350W max – 250W nominal.
The KIT is street legal with certification for the European Union and China. 

The pictures bellow can talk and say the rest of the story.
Regarding KIT pricing details you may contact the company in China, the pictures with the carton box has all the information’s that you might need.   

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Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #1 on: November 20, 2014, 07:47:21 PM »
2
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Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #2 on: November 20, 2014, 07:59:13 PM »
3
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Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #3 on: November 20, 2014, 08:09:22 PM »
4
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Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #4 on: November 20, 2014, 09:10:00 PM »
5
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Tomjasz

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #5 on: November 21, 2014, 10:04:54 AM »
What is this part?

Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #6 on: November 21, 2014, 10:55:13 AM »
Quote from: Tomjasz
What is this part?
This is a mirror bracket for motorcycles and from the very expensive ones.
It was holding my older project of Li-po powered headlight and rear light.
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Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #7 on: November 21, 2014, 07:56:50 PM »
Progress LOG, Day number two.

Taking apart the bicycle crank is definably a job for adults with special tools and experience.
I will definably insist and highly recommend this job to be made by a professional regarding bicycle repairs.

Personally I do have advanced skills and tools, and I am capable to improvise if needed, which in this case it was needed, but even so I did make a telephone call to a friend bicycle repair man, so to get the information that by high percentage, the nut over the frame (side of the sprockets) gets out by rotating clockwise.
In the end I had to use cutting disk (power tool) and extreme force by chisels and hammering so to take it off.

Regarding inserting the motor in the frame crank hole, before you do that all welding of its frame pipe it needs to be inspected from inside, if excess welding material is blocking the way?

I did use one rasp to make smoother and flat all welding points inside this crank hole.
With a bit of lubrication over the BEWO motor axle, and movements left-right and pushing-in, the motor get in place with a tight fit.
No hammering - no violence at all...   
   
I had to work three hours totally focused in what I was doing, and at slow speed so to avoid mistakes.
After this high importance step, the next ones seems much easier to perform, but this day has ended all ready.   :)
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Tomjasz

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #8 on: November 21, 2014, 08:10:42 PM »
Good job! I used a new bike and it came apart very easy. BUT I did buy the specialty tools for removing the crank before proceeding. I decided that having the correct tools would save me problems initially and throughout the life of the conversion. I now have one tool box of items and tools just for the EBike. Changing cassettes today proceeded smoothly since I had already purchased the two needed tools. I tested my windscreen today in -5C. It helped but it was still a very cold ride. I could not reach my usual 32KPH. The battery cooled off quickly. I envy you and your beautiful Greek weather!

Where is the controller for the BEWO mid drive?



Online Kiriakos GR

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Re: ITTSB project, code name: Ebike Mid-drive KIT by BEWO Tianjin University
« Reply #9 on: November 21, 2014, 08:50:02 PM »
It is in the Greek TV News that USA is fully covered by snow.
And because you seem younger than me I will advice you to stay home.  ;D ;D

I am so tired that I did not even bolt-on the motor.
But I do enjoy the view of the motor in place.  ;)

BEWO it does offer in their KIT a tool with two pins,  similar to what most disk cutting power tools using, so to exchange the disk blade.

According to my friend, professional bicycle repair man, an ten years old bicycle like my, it is a much difficult case than the new ones.
Oxidation and salt can turn such a process in to a true battle, even for Pro's.   
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