4WD stand up scooter

nickstyl

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Joined
May 1, 2022
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Hello people.
Great reading on this site, first post here.
So, Im wanting to build a 4wd scooter, as in picture.
Nothing but thinking stage at the moment.
Anyone here dabled in this?
Wheel size, motor watts etc?

Will either use existing/available wishbone suspension or try to custom make alloy ones.
 

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nickstyl said:
Wheel size, motor watts etc?
These will be a compromise based on your situation, needs, budget, limitations, etc.

Bigger wheels means, generally:

--better ride quality over non-smooth terrain. The worse the terrain, the bigger the wheels for the same ride quality.

--higher speed for the same motor/controller/etc configuration.

Smaller wheels means, generally:

--higher torque for the same motor/controller/etc configuration.

--harsher ride quality over non-smooth terrain.


Suspension makes a difference on the ride quality, but bigger wheels go over bigger obstacles more easily.

Faster motor winding / higher voltage systems compensates for smaller wheels, regarding speed. Slower winding / higher current for larger wheels, regarding torque.


Motor watts depends on what specfically you need it to do for you. I recommend the http://ebikes.ca/tools/simulator.html to get an idea of how the systems work vs the terrain, speed (including headwinds), etc. Riding on the flats takes MUCH less power than going up a hill all other conditions the same; riding against the wind, similarly, and the faster you must go the more power is wasted fighting air resistance.

It's not just the raw watts of the motor, it is also the capability of the battery (which is the most important thing as it must supply all the power for the entire system on demand, so must be *more* capable than you need it to be; as it ages it will become less capable), and of the controller.

If you need a lot of range, or a lot of power for a long enough time for climbing or speed, the battery could be quite large and heavy, and may not be able to be placed in a single spot (may need parts of it in various places around the scooter) because it could unbalance the scooter under various conditions if it were all in one place.


If the suspension must work at speed, you'll likely want non-hub-motors, which then means some form of flexible power-transfer to the wheels, and greater drivetrain complication. If it only needs to work while crawling along, hubmotors can work ok, with simpler and more reliable drivetrain.
 
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