A light electric stand up scooter

[ferias77]

Hi,

There are 10.4mm between the wheel and the motor mount, and the chain is 7.4mm wide, so there are 1.425 mm each side.

There is no problem with the brake, but it is very close, so I will modify the motor mount in order to have more security.

Eric

[nyx]

Hi Eric,

1.425mm ( really accurate !!! ) is not Inevitably an problem. Between the chain on the freewheel and the scooter Frame, i have no more than 1mm. But as the motor is fixed on the frame, nothing moves so i didn't have any problem.
In your case, you would need a bit more as the wheel is not far, and you motor is not placed on the frame but on a support.

Yesterday I used once again my scooter. Its really pleasant, power is enough to run without getting tired. The motor is still not to much hot, so with my 50mm fan and an NACA air intake, it will be really good.

I have another question for the experts. I would add an switch for cutting off. for exemple when i go in the subway, i would cut off with this switch and not unplug any thing. But for that i will need to pass 50Ams max in this Switch. I saw some switchs which can cut up to 25Amps, in my cas i don't need to cut lots of Amps (when i cut the motor si stoped), could i use a such switch ? if else i could i do?

Thanks

Thibaud

[adrian_sm]

My preferred method is to just use a controller that has an on/off switch. Like this:
http://www.hobbyking.com/hobbyking/stor ... duct=10331

[nyx]

I don't understand. is there an switch on the ESC ? it looks to have the same features as my ESC :
http://www.hobbyking.com/hobbyking/stor ... oduct=2166

[adrian_sm]

Unfortunately it doesn't show it in the pictures or the description, but it actaully has an external switch.
Pleasant surprise when I got my first one.

Hang on, I'll take a pic of mine..... here you go.....

fr_950_size580.jpg (113.71 KiB) Viewed 1108 times

[nyx]

ok I prefere That so i don't have it on mine. but like that it doesn't cut the battery so the mattmeter is still powered. Anyway its an nice an easy way. I think i will begin without.

[nyx]

Hi all,

i Worked a bit on my escooter.
I managed to find an aluminium plate of 1.8mm, so I'll be able to make hoods.
I installed my wattmetter.
Finally i moulded the hood for protection of the chain and sprocket from my feet. I am happy with it.

Check pictures

Edit : I just ordered my 3S Lipo, an Turnigy nanotech 6000mAh

[ferias77]

Hi,

Thanks for the photographs nyx. I like the fiber protection for the chain.
I ordered the 6374 motor, the controler, the chain, the gearwheels and all the wires. I hope it will come soon
I think I will put the wattmeter on the handlebar, because the batteries will be in a backpack.

[adrian_sm]

You might be interested in this remote shunt mod for the watt meter.
http://endless-sphere.com/forums/viewto ... 76#p320027

- Adrian

[ferias77]

You might be interested in this remote shunt mod for the watt meter.
http://endless-sphere.com/forums/viewto ... 76#p320027

- Adrian

Thanks for this topic Adrian. I will try without modifying my wattmeter in a first time, and if it works, I will modify the wattmeter.

[ferias77]

Hi,

I received the gearwheels, now I am waiting for the motor and the controler, I hope it will come soon !

I modified the motor mount in order not to have any problem with the brake :





I will make a protective device in order the motor not to touch the ground...

[adrian_sm]

Looking good. How much work is there in modifying the wheel/axle to accept the driven gear?
The rest looks like it will just bolt on with no modifications to the scooter. Very nice.

- Adrian

[adrian_sm]

Oh, and make sure you have clearance between the screw heads and the chain, the two left most ones to mount the motor mount plate look like they are at the same diameter as the driven gear. Since you have the CAD model, best to model them up.

- Adrian

[nyx]

Nice Ferias, I can see that manage easily CAD software. I wish you to success your project as i did.

On my side i finished my scooter, i am just waiting for my 6000 mAh battery. Today i finished the hoods, its as i wanted, and i installed an 50mm fan.
This afternoon I've made tests with an GPS. on flat i can reach 20-25kph on full throttle, thats good as by pushing only with the feet (without moror) i can't go over 20kph.
On an small descent i reached 30kph, its pretty fast on a such scooter even with 200mm wheels. I definitively would not go faster...

At the end i thought i burned my motor as i did'nt avec any power but it was my ESC which was reducing the power as the Lipo was empty. I've been scared

more pictures:

https://picasaweb.google.com/thibaud.ri ... oNucleaire

[ferias77]

I just need to cut the frame for the motor mount and to drill the 4 holes. I don't need to modify the wheel. And I will use countersunk screw not to have problems with the chain.

Nice work nyx ! Do you know the weight and the range of your complete scooter?

[nyx]

Hy Ferias,

I just weighted my scooter, Decathlon annonce it a 4,7kg, mine with the brand new 3S 6000mAh nanotech wich fits perfectly in the frame weight a bit less 6kg.
I took the subway with its and i can't see the difference its really good.

Concerning the range its really hard to say as it is very variable. For going from my garage to my home, its about 1km, and i generaly pull about 600mAh using a lot the motor as the Pavements are free and I can go fast with the motor.
I've been two times in the center of the town(Lyon) with lot of people on the pavements, then i can't go fast with the motor, and i am often pushing with the foot. There i consumed about 300mAh for 2km...

well to conclue i think that at the max consumption, so in the worst conditions, the range is about 5km. But by using the motor Intelligeament, not for launching, I can easly reach 15 or 20 km.

Finally its not a lot but as the battery can just fit in the frame, and as its more than i wanted, i am really happy with it.

I think i found a way to make a freewheel with 11Tooth, I just need to find a sprocket like This 11 Tooth 10mm Bore Sprocket For #25 Chain
http://www.electricscooterparts.com/sprockets.html
But I wouldn't pay $30 of shipping just for it. Does anyone has one to sell to Me ???

Thibaud

[ferias77]

Thanks for the information about wheight and range.
How do you will make the 11 tooth freewheel? I am very interested. On electricscooterparts, it is a sproket and not a freewheel, no? I don't know where you could find it...

And I asked adrian_sm if it was necessary to add extra capacitors on the controler in order to eliminate voltage bursts. His answer, which could interest other people :

You should post this stuff in your thread. Then everyone can benefit from the answer, and I might write a more complete answer. anyway....
I haven't ever put extra caps on. But I always peddle first, and will soon have protection from people hitting the throttle at standstill.
But they can't hurt, and will help keep ripple voltages in check.
Remember my aim is to make a robust system with minimal mods to stock parts, so I will only do mods like this if REALLY required.

- Adrian

PS feel free to copy this answer into your thread if you wish.

Eric

[ferias77]

I received my motor !

So I mounted it on my scooter with the modified motor mount :





Eric

[adrian_sm]

Stop making this look so simple. You are making me want to build one.

Nice job.

- Adrian

[nyx]

Whoawo its really nice job Eric, your Support is really clean. I don't know the word for "CNC" in english, but do you have one ?
its definitively a bigger motor than meine, but i am happy with it. I am coming back from the post office, about 2km, and I used a lot the motor, lot of acceleration and nice speeds, I consume 1Ah so its pretty good, and the motor was not too hot

By mounting the motor like this, are you not affraid to shoot it with the foot when you while push the scooter with it ?

I look forward to see the next

nice job

[ferias77]

No, no CNC, only my hacksaw, my file and my power drill.
I push the scooter and I brake with the right foot. That's why I put the motor on the left on the scooter. So I think it won't raise any problem.
I soldered all my plugs and started the motor. It's ok, it works ! But the motor is not very well balanced...
I think your motor is ok for riding on the flat. Do you tried to climb a hill?

Eric

[walls99]

Salut Eric,

Nice work! how are you going to attached the sprocket to the wheel? do you have any picture?

Merci,
Laurent

[ferias77]

Hi Laurent,

The sprocket is attached to the wheel thanks to 2 spacers and 4 screws. I could have made a picture... but my laptop decided to die this week end... So I don't have more access to my CAD model... We can see the spacers on the pictures on the previous page. The 4 screws are fixed between the spokes of the wheel.

Eric

[nyx]

Hi all,

I am sorry for your laptop Eric, i hope you'll be able to finish your scooter without difficulties...
you're right, my motor is just enough for flat and very light climb... but that enough for me.

Since yesterday I have something strange on my scooter. I'll try to explain the problem :
so since yesterday for the same speed/power I have to put more throttle. for example before, for about 10kph and 200-300W, the throttle was at about 1/4. now for about same speed/power the throttle is more than 1/2.
I can push the throttle at 100%, I reach 45-50A. Before I couldn't push the throttle at 100% whitout pulling more than 50A.
Its not a real problem as now at full throttle, I can't burn the motor. But I hope the power will not reduce again, and i'ld like to know the reason...

I am sure its not the battery, I made a new test just after a full charge...
can it be my servo tester ? Or my motor which has lost power?

Thanks for help

[ferias77]

Hi,

My scooter is progressing... but not as fast as I would like, I would need 48 hours / day
I machined almost all the parts (with my hacksaw and my file ), it is ok. Photos soon.

And I installed the wattmeter, the controler, and the servo tester. I made the cables longer between the battery and the wattmeter, between the wattmeter and the controler and between the servo tester and the controler. With normal length cables, the start of the motor is very soft. With my longer cables, it is really harder, there is a "clack" when the motor starts. After, it runs very smooth. Any idea why ?