If you have 4k to build a electric cart, what would you buy?

[steveo]

Hey guys

So I'm in the middest of a electric go kart build and am looking for suggestions on parts to go with..

we already have the go cart.. so a solid 4k of parts would be ok....

What would you recommended... I'm pertty hard with the motors/controllers/batteries.. in a sence if i'm not pushing them to there limit i'm not pushing hard enough...

we are looking for a top speed of about 150km/h... to give the shifter carts a run for there money....

we need to run a miniumum of 10-20 minutes on the track.. most of the time WOT...

so we need the following, (we want this to be a simple kit to put together....nothing with extensive modifications to work.. like most of my stuff lol)

Battery
Motor
Gearing etc

brushless or brush .. ask long as its in the budget... and we can mount this motor without it being a nightmare...

please post links, or point me in the right direction... love to hear your thoughts...

steveo

 

[neptronix]

Motenergy 4201 ( 50kV ) on a single reduction stage, 36FET infineon/kelly/greentime, lipos galore.. aanndd.. done

 

[Farfle]

My bets on an agni, big alltrax or Kelly and a tray of nanotech Lipo

 

[steveo]

My bets on an agni, big alltrax or Kelly and a tray of nanotech Lipo

we wanted to go agni.... but these motors are getting hard to find...

I'm looking at pouch a123 20 ah or nanotech lipos... wana make it a bit safe though...

Motenergy 4201 ( 50kV ) on a single reduction stage, 36FET infineon/kelly/greentime, lipos galore.. aanndd.. done

I really like to motenergy motor selection on there website... since the cost is fairly cheap.. i may go even bigger motor.. hehe

I can build a cheapy 24 mosfet controller hehe...

-steveo

 

[liveforphysics]

With only 4k, and wanting to hang with shifters, I would go brushed. Dual Perm132 or dual Agni 95r. Run them in series (because brushed motors in parallel only works on paper), or run them on separate controllers.

 

[steveo]

ok ...

so the second person involved in the project... is wanting to go with a mars motor rated at 11.5kw continuous... 30kw peak.. roughly 700$

http://www.evdrives.com/product_p/mot-me1003.htm

I Personally have to agree with you LFP... I say dual motor setup ... or.... a 6-7" forklift motor... or...a brushless motor from ... motenergy with a modded infinion brushless controller...

i think a123 is the primary battery i would choose to go with ... 24s 2p a123 pouch cells... however the assemble is a B*&%H

or 24s lipo setup... we would like to stay 100v to 80v range...

 

[John in CR]

"If you have 4k to build a electric cart, what would you buy?"

Since I have everything I'd need in route or on hand other than the kart itself, I'd invest $3k in something else, and use $1k for the kart and tires and some practice time in a gasser kart to get a feel for the performance it needs to top. 8)

 

[mikebikerad]

If you go brushed it might be worth looking at the D&D ES-15-6. The one on my kart is barely over ambient after 20 minutes of use but it is a big peice of copper! Alot cheaper than dual agnis and simpler install but heavy heavy heavy. My kart goes 40 mph on 60 volts with a 4:1 gear ratio.

 

[shawn_1976]

This is what Steveo and I have to work with

 

[shawn_1976]

With only 4k, and wanting to hang with shifters, I would go brushed. Dual Perm132 or dual Agni 95r. Run them in series (because brushed motors in parallel only works on paper), or run them on separate controllers.

If you ran two motors in series with a 90V battery that would be 45V at each motor..Correct?

Would there be away to shut one motor off on the straight aways and apply full 90v to a single motor for peak speed? Or would the other motor put to much drag on the system?

 

[Arlo1]

You should be able to find a 6.7" series wound brushed motor like theses guys for cheep or free. [youtube]bERjkSTYOdU[/youtube] Controllers are cheep to levening you a lot of money for batteries. I love brushless motors but when it comes to cost or a budget you can't be the price of a set up like theirs.
This is what I used on my dune buggy the motor weighs 46lbs and the current controller is ~ 2lbs.
If you go brushless I would see if you can get the new 40hp motor from Zero and push it a bit.

 

[docnjoj]

If you use A123 cells (20ah) agniusms kit make assembly fairly straightforward. I think he tested to 200 amps which may be less than you are looking for. He does make a 3P kit also as well as the 6-30S.
otherDoc

 

[steveo]

how about this beast!!!!!!

http://www.evdrives.com/product_p/mot-es-15c-6.htm

dual shaft is what i'd do .. who know what you could use the other end of the shaft for heheh

-steveo

 

[shawn_1976]

I have mounted a D&D motor to the kart. I have an Alltrax 72V 450amp controller. I am having issues with the chain. I measured the chain that came with the kart, it had a half inch pitch, check the info half inch pitch is #40. So I bought 40 pitch gears. Chain didnt work. After some research I find out chain that the chain is a 428 so is my gear on the rear axle. But I can't find a gear to mesh with the 428 chain for the motor. The motor has a 7/8 shaft with 3/16" key. Looking for 19,20,21 tooth gears.

Can any one point me in the right direction?

 

[Arlo1]

What you run into is although #40 and 428 chain are both 1/2inch pitch the #40 is a smaller rolller. I dont know if there is much for taper locks for the motor shaft that will use a motorcycle style (428) chain roller style So what I did was machine all the vallys untill the chain fit into the groves and wraped all the way around the sponcket.

 

[mikebikerad]

http://www.mcmaster.com/#roller-chain-sprockets/=ky9hdi

I used these sprockets with heavy duty roller chain. Lots of chain noise but no worries and cheap sprockets.

 

[shawn_1976]

What you run into is although #40 and 428 chain are both 1/2inch pitch the #40 is a smaller rolller. I dont know if there is much for taper locks for the motor shaft that will use a motorcycle style (428) chain roller style So what I did was machine all the vallys untill the chain fit into the groves and wraped all the way around the sponcket.

I was thinking of doing this. How perfect do you think it needs to be? Did you have any premature chain wear after? The gears are so close, only need a little material removed

 

[Arlo1]

What you run into is although #40 and 428 chain are both 1/2inch pitch the #40 is a smaller rolller. I dont know if there is much for taper locks for the motor shaft that will use a motorcycle style (428) chain roller style So what I did was machine all the vallys untill the chain fit into the groves and wraped all the way around the sponcket.

I was thinking of doing this. How perfect do you think it needs to be? Did you have any premature chain wear after? The gears are so close, only need a little material removed

Ive only done it on 2 of them one for my YSR and one for my electric dune buggy. So far so good but they are low miles as of right now.
Get it as perfect as you can. If you get the right size bit and mount the sprocket in a cross slide vise under a milling machine or a solid drill press it would be the best.
If you do it by hand remember the bit will try to climb to the direction it spins.

 

[steveo]

http://www.youtube.com/watch?v=l6E7ASqmPoo


Sent from my iPhone

 

[mikebikerad]

That motor looks like the smaller D&D 10E-33?

Looks like fun in the wet like that. When it dries up we all need to see some white smoke action

 

[shawn_1976]

What you run into is although #40 and 428 chain are both 1/2inch pitch the #40 is a smaller rolller. I dont know if there is much for taper locks for the motor shaft that will use a motorcycle style (428) chain roller style So what I did was machine all the vallys untill the chain fit into the groves and wraped all the way around the sponcket.

I was thinking of doing this. How perfect do you think it needs to be? Did you have any premature chain wear after? The gears are so close, only need a little material removed

Ive only done it on 2 of them one for my YSR and one for my electric dune buggy. So far so good but they are low miles as of right now.
Get it as perfect as you can. If you get the right size bit and mount the sprocket in a cross slide vise under a milling machine or a solid drill press it would be the best.
If you do it by hand remember the bit will try to climb to the direction it spins.

I used a 40 pitch gear on the motor, a 428 gear on the rear with a 40 pitch chain. It seems to work well. Only time will tell.