My electric gokart

[arno9173]

hello

sorry if my english is bad , i am french

the gokart is based on a 36v 1000w my1020 motor , modified (better cooling , 5 turn wire less on the rotor coils )
i have mesured the power at 2530W continus at 48v, with the efficientcy of the motor i can said 3hp mecanical power

it is powered with 4 12v 15ah longex deep cycle battery in series

the controller is self made (if someone want i can put the schematic and the pcb online)
it can handle a current up to 100A and 80v , with curant limit adjustable and under voltage shut-down

i use a 70A automotive relay as kill switch and a 60A rearmable fuse , the power wire is 4mm2 industrial wire

the main frame is 40mm square tube , the axle is 20mm c45 precision steel rod

11 tooth sproket on the motor and 64 tooth on the axle

the total weight is only 34kg with battery , speed up to 40km/h in 6 seconds on flat

 

[baer]

Very nice!
I liked the disc brake and sprocket part did you make it yourself?
The wires looks a bit thin for the high amp.
Please upload the schematics.

 

[arno9173]

the disc brake and the sprocket come from a scooter
i machined on a mini lathe the holder , its verry simple , a 70mm aluminium rod drilled in the middle (on lathe) at 20mm and secure to the axle with a 8mm pin

the wire go a bit hot but dont melt , i can touch without burning the skin

here is the schematic for the controller , for more amp must meore mosfet and flyweel diode in parralel , it can be upgradet to more than 500amp with 10 mosfet and 10 diode , it need a auxiliary 15v power supply , i do this by put a tap on the batterys at 24v and a 7815 regulator

 

[landuse]

Nice kart! Well done. How long can you run before you have to recharge?

 

[arno9173]

about 30mn , not always at full trottle

4 hour to charge the battery with a 4A charger

 

[Nodroz]

Wow! Very nice electric gokart you've got there! Just awesome.
The only negative thing in my eyes is that it takes a lot of time to charge...

 

[arno9173]

lead acid battery can not be charge faster , it can dammage the battery , i have 2 set of battery

nicd or nimh battery is better for fast charge in less than 1 hour
but there are more expensive , for the same voltage and capacity i need 80 elements of 8000mah 1.2v D cell and cost 4 time more than lead-acid

i do not use lithium battery because it's unsafe and need a special bms and a good cooling otherwise it can explode and cause sever burn

 

[builder bob]

that's a cool cart! lithium batteries aren't realy that dangerous. if u use a good lithium battery charger and don't crush, puncuture, hold a match to, or over charge you'll never have a problem. they only warm up if you discharge/charge them to fast and most of the new chargers keep them from over heating, having the cells at different voltages, or over charging. B grade lithium batteries for r/c planes can be gotten inexpensively also

 

[Camn]

Nice job on your go kart! I just finished one similar with the same motor you used except its 36v. Could you explain what you did to to motor to modify it? I am interested in modding my motor but I have never opened one up before.

 

[ML-TOYS]

What are you using for variable speed throttle