4WD hybrid electric go-kart (4 motors) - part 2.
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Uploaded by NZAndy222 on Nov 12, 2010
1000w electric motors on every wheel with 2.4hp petrol motor charging 42Ah (more like 33Ah at high current) AGM type batteries using 100A car alternator controlled with home built programmable drive putting out 42V no problem - Home made PWM drive good for at least 500Amps. (And need it as it sucks 2-3 times more current under heavy start-up load)
Uploader Comments (NZAndy222)
All Comments (26)
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Nice machine, well done.
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that is bad
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you should get the Coolest dad award. I am thinking of making something similar but i am going to use 4 chainsaw engines and a computer to manage it all. It will be an engineering project for my university
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Goes 50Kmh, 36v on batteries at top speed, 40v with petrol motor charging.
Could go a lot faster, gearing is set low for off road driving, with the gearing it has now it will tow my car!
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Freakin' Genius, I'm an electrical engineer, and this is a far better way to build an off road kart. Plus, why bother with clutches and gears when you don't have to.
Couple of questions though...
Was your PWM cheap to build?
How did your alternator charge your batteries, how did you convert the voltage from what I'm guessing is 13.7v to 42vdc?
Buzzybee73 1 week ago
@Buzzybee73
Making the PWM was cheep compared to buying one that could handle 400A and 1,000 amps spikes. But if I were to do it again I would be tempted to buy one. I programmed an Atmel chip to PWM a pile of FET's, my design is really an overkill, but there is no current limiter and that's good for 4WD vs. a golf cart like most are made for.
NZAndy222 1 week ago
@Buzzybee73
For the alternator I basically opened it up and cut the connections to the field winding controller then directly connected the field windings to another PWM control I made, works fine.
NZAndy222 1 week ago
@Buzzybee73
I can set alternator output voltage and it is variable. I did not even think that I would get 42v, but it works no problem and even takes surprisingly little field winding power.
NZAndy222 1 week ago
how many miles, km, can you drive it?
simcaP60fan 1 month ago
@simcaP60fan
I don't know, I will have to try that some time. most of the time we don't even bother starting the motor.
NZAndy222 1 week ago