Light Electro Bobber (short version)

Connected wiring,Bought a smartphone (Digma Linx A400 3G -$ 15) for the speedometer(smart bms)
https://youtu.be/H6DcQMO03LU
 

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Wow, that's an amazing build, kudos!

We need more pics and more descriptions, don't be shy!

I'd like to build this kind of flat sheet frames one day, but I always wondered: how do you attach the main tube for the front fork ? (sorry, I'm not sure how it is called in english, I mean the tube with the bearings which connect the frame to the steering column?)

I believe that's the critical part to get right, would you mind explaining how you did it?
 
Dui said:
Wow, that's an amazing build, kudos!

We need more pics and more descriptions, don't be shy!

I'd like to build this kind of flat sheet frames one day, but I always wondered: how do you attach the main tube for the front fork ? (sorry, I'm not sure how it is called in english, I mean the tube with the bearings which connect the frame to the steering column?)

I believe that's the critical part to get right, would you mind explaining how you did it?
Click to expand...
Hi!Thanks.
So
parts are made on a milling machine
 

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cut and fitted a leather seat
 

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Alexander1971 said:
parts are made on a milling machine
Click to expand...

That's a clever solution, it doesn't seem to require any welding.
Great work, can't wait to see it finished!
 
Seat ready.......)
 

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Motor burned out! Rotor rubbed against stator walls and overheated windings
 

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Sorry to read about the motor. What do you think the weakness was...poorly centered bearing cup, inadequate bearing support, a loose wire in the winding?

Am I looking at the pictures correctly and the headtube piece is only bolted to the frame, or is it welded? I'm always terrified of a failure in that area and opt for overkill in my welded connections.
 
John in CR said:
Sorry to read about the motor. What do you think the weakness was...poorly centered bearing cup, inadequate bearing support, a loose wire in the winding?

Am I looking at the pictures correctly and the headtube piece is only bolted to the frame, or is it welded? I'm always terrified of a failure in that area and opt for overkill in my welded connections.
Click to expand...
Thanks.
It was displaced rotor axis (cover from another motor).
In the motor housing I made 3 inserts 10mm + the axis of the pendulum 12mm passes through the motor housing in (the motor housing had 4 through holes 10mm).
 
I've been thinking about your battery layout, and I have some concern regarding the lack of compression applied to the individual cells. Every electric car battery I've disassembled has had compression force on the 2 faces of the cells. It is an important part of the battery structure affecting both capacity and cycle life.
 
John in CR said:
I've been thinking about your battery layout, and I have some concern regarding the lack of compression applied to the individual cells. Every electric car battery I've disassembled has had compression force on the 2 faces of the cells. It is an important part of the battery structure affecting both capacity and cycle life.
Click to expand...
The aluminum case of the battery has good durability.
 
Alexander1971 said:
John in CR said:
I've been thinking about your battery layout, and I have some concern regarding the lack of compression applied to the individual cells. Every electric car battery I've disassembled has had compression force on the 2 faces of the cells. It is an important part of the battery structure affecting both capacity and cycle life.
Click to expand...
The aluminum case of the battery has good durability.
Click to expand...

In my experience they all swell, and I'm talking about prismatics, not just pouch cells. At a minimum be alert for it and check early in the life for any changes with a caliper. If you notice a change, then make some wedges of a light but rigid material to fit in between with a tight fit when the pack is at a fairly deep DOD (The width dimension changes a bit with SOC).
 
Changed the winding scheme and filled with heat-conducting compound.
 

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:bigthumb:
 

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Replaced the drive pulley from 18 to 14 teeth.
Configured correctly sensors Hall.
Maximum motor temperature 60 degrees Celsius (battery current 80amper, current phase 140amper)
 
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