7.5KW mid drive stand-up scooter build project.

Lightweight / Folding / Portable EVs - seats optional
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ilia-45   100 W

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7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 04 2022 11:45am

It's been a long time since I posted here :roll:
I wanted to share with you my current project , this project now in design state (CAD) , it will be a stand-up water cooled , mid drive 7.5KW (up to 13.5KW peak)motor , 200A controller , 20s-12p battery monster :wink:
This will be heavy duty machine in all means , for now calculated mass is around 110 kg , all body parts will be 6061-T6 aluminum ,the wheels will be 13x6.5-6 , I design it to be my daily rider .
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In current state model is still not finished , its does not have suspension (I'm waiting for parts ) , and I need to make a lot of small corrections , before it will be ready .
Most of the parts I use in this build are from motorcycle/atv word , as brake levers, calipers , brake disks, speedometer .
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I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 05 2022 5:00am

Despite the size of the scooter , there is not enough space inside for all the components , as all the component are big and bulky , for example the motor occupies almost 1/3 of the chassis space:
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The motor controller is also huge :
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All this creates some problems :confused:
So this machine can't be build in classic layout , when all the parts are placed under the "main plate".
I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 05 2022 5:06am

So I had to distribute various blocks throughout the chassis :roll:
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I apologize for my english

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BigBlock   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by BigBlock » Nov 10 2022 2:10pm

Very interesting design - I would be concerned about the 110kg mass. If so, it will need some serious suspension design to handle

How much is the weight of the frame only ?
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liveforphysics   100 GW

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Re: 7.5KW mid drive stand-up scooter build project.

Post by liveforphysics » Nov 10 2022 3:01pm

Why not go belt drive?
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BigBlock   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by BigBlock » Nov 11 2022 4:42am

liveforphysics wrote:
Nov 10 2022 3:01pm
Why not go belt drive?
The design of the rear wheel swing arm is quite straightforward but I believe it bring some challenge. The roller tensioner cannot work with chain. A different chanin tensioning system should be designed, unless a belt drive is used.

Also it would be interesting to know more about the motor RPM and gear ratio on the rear wheel sprocket
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SlowCo   10 MW

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Re: 7.5KW mid drive stand-up scooter build project.

Post by SlowCo » Nov 11 2022 8:48am

Nice project :thumb:
I suspect you'll be replacing rear tires very often wit that much power and such small wheels :mrgreen:

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 22 2022 5:49am

BigBlock wrote:
Nov 10 2022 2:10pm
Very interesting design - I would be concerned about the 110kg mass. If so, it will need some serious suspension design to handle

How much is the weight of the frame only ?
110 kg it's a normal mass for motorcycle , this one is a stand-up version :wink:
Will be proper suspension, I'm waiting for parts now.
I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 22 2022 5:50am

liveforphysics wrote:
Nov 10 2022 3:01pm
Why not go belt drive?
It's need more attention then chain :wink:
I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 22 2022 5:53am

BigBlock wrote:
Nov 11 2022 4:42am
liveforphysics wrote:
Nov 10 2022 3:01pm
Why not go belt drive?
The roller tensioner cannot work with chain. A different chanin tensioning system should be designed, unless a belt drive is used.

Also it would be interesting to know more about the motor RPM and gear ratio on the rear wheel sprocket
The tensioner work very well on chain , look at aftermarket motorcycle parts :wink:
As for the motor RPM it's 4000 up to 6000 , gear ratio 3.5 to 1(final drive).
I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 22 2022 5:54am

SlowCo wrote:
Nov 11 2022 8:48am
Nice project :thumb:
I suspect you'll be replacing rear tires very often wit that much power and such small wheels :mrgreen:
The time will show :lol:
I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 23 2022 5:07am

By the way , those are the tires 8)
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I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Nov 23 2022 5:11am

Machined all the parts for my steering tube 8)
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I apologize for my english

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ilia-45   100 W

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Re: 7.5KW mid drive stand-up scooter build project.

Post by ilia-45 » Dec 05 2022 10:19am

Some welding :flame:
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I apologize for my english

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