Electric vehicle motors (DC motors, AC motors, hub motors, etc)

Howdy Folks,

I need advice on the Kollmorgen 400w motor. Does it have any overcurrent protection? I've heard that the controller fails easily and I'm afraid this may have happened. It is in a go-kart I built for kids. The kid and kart weigh about 150 pounds together and it is geared for a top speed of 15-18 mph. It started to lose power and quit after about two minutes of running. It no longer works and it draws quite a bit of current when power is applied and its at idle.

The test driver afterward mentioned something about having to use the brakes to bring the kart to a stop. He seemed to be saying that the throttle was stuck but it was hard to get a clear answer. When you're test driver is only 8 years old you don't exactly get the kind of technical feedback that you might get from Michael Schumacher. So he may have been sitting there with it power-braking for a minute while we were talking about the kart. When he tried to go again it just sort of crapped out. The motor only got slightly warm. I think the controller blew, but when I take the back cover off I can't see or smell anything fried. But I think it's toast anyway.

Can anyone tell me of a controller that would work as a replacement for the internal one? Something that is more robust but doesn't cost more than the motor? I'm running it on 24 volts.

I am looking for a sprocket (11t preferred), for my brushless Etek motor (7/8", 3/16" key). So far I haven't found anything in the 415 size that will work on the motor.
Can I swap out the 415 chain for a 41 chain, and just get a 41 chain sprockets for my motor? Will i notice any wear issues on the rear (sized for 415 chain)sprocket?

A couple of us in Sebastopol are putting together a group purchase of the new GoldenMotor "magic pie" hub motor with internal 25A controller.
This runs on 24-48v safely with a Vmax of 60V
Available in 26", 28", 700 wheel sizes in either Torque or Speed optimized versions.
They're offering special price today, Oct 20th of $160 plus shipping, with ocean ship possible at six or more motors.
We're after four more guinea pigs to join us and get the low sea ship price.
Not trying to forum hop, but details can be seen at endless sphere.
Call me if you're interested at: 7 oh seven, ate too 3, three 2 two 7

Ross
from emotors.biz
Sebastopol

In Electric Bikes, Go Green, Not Mean - Drawing The Line I noted someone discussing the need for a transmission on electric motorcycles. I think the same is true for electric bicycles. At Interbike I had a chance to try the NuVinci CVT and am very impressed.

It was on a bicycle but if you look around their website (http://www.fallbrooktech.com/) it's clear they are targeting other vehicles in addition to bicycles. On the bicycle there was a selector lever on the handlebar, and you chould change the ratio at any time you like. Unlike on a derailleur bicycle where the wheels have to be moving to change the ratio, with the NuVinci CVT the ratio can be changed whenever you want.

The ratio is determined by the positioning of some balls inside the CVT. It looks really cool.

I have a flyer from them in my hand saying the NuVinci is available in a ready-to-install aftermarket kit or pre-laced in a rear wheel. Unfortunately their website doesn't have a product description, but there are some press releases that discuss this

http://www.fallbrooktech.com/05_PressReleases_ibdprog.asp

http://www.fallbrooktech.com/05_PressReleases_biobike.asp

http://www.fallbrooktech.com/05_PressReleases_orgchange.asp

The press kit has a lot of information and a history of the company. An interesting thing is that they have a sister company who's using the NuVinci CVT in a small scale wind turbine.

http://www.fallbrooktech.com/presskit.pdf

hi there i have two motors.my1020 750w 36v 2800 rpm blue unite motor,and a my1020 1000w 36v 3000 rpm black unite motor.why,using the same gear and state of charge set up,my bike runs slower whit the 1000w than the 750w,it dose have more torqe but less top end speed even if its rated at higher rpm...
any clue

best regard

Is there way to tell if a brushless motor has an internal controller?

I'm trying to purchase the motor that comes with the my6812gz - 150 watt golf cart motor. It is made by Zhejiang unite motor co. Ltd, China. I can get to there internet sight but they only sell in quantities of 1000 or more and I only need a couple of them. Does any one out there have any Ideas as how one could find a distriutor here in the US that stocks these motor drives>

Hi there I recently came accros 2 motors i believe that they are BMC types the silver one is listed as 2hp 24v the black one has no rating on it the silver motor has a black and red wire (thick) and has 6 smaller wires. The black motor has a black and red and has 4 smaller wires.. is it possible that the smaller wires are for a throttle, switch etc??? if anyone can provide info wiring diagram (what goes where) that would be great .. i was thinking that they might make good scooter motors..

Hi Everyone
I am new to V is for Voltage but I have decided to take the plunge and perform my first conversion. I maybe starting to big but no guts no glory. I am planning on changing my extremely pollutant lawn tractor to electric and have seen some conversions online but instead of just placing an electric motor where the gas engine was I want to have an electric motor on the blades directly and one for the drivetrain. I think I have picked the one I need for the drivetrain but I am having difficulty finding the right motor for the blades, any suggestions?
I am planning to go with a 48 volt motor on the drivetrain and thinking this voltage would work best for the blades since it would reduce the electronics needed for different voltages off of 1 48 volt battery bank.

Any help would be appreciated.

Hi! I have some questions about a battery-electric powertrain in cars...

For a compact car beyond 2020, with a target dry weight of about 1000kg, what motor would be required to balance highway performance, cost and size? would a twin motor be more practical?
What would the spec and approximate dimensions be in each case?
What would the dimensions of the controller be?

I understand these are very specific questions, so if you could point me out to other resources that might have an answer that would be great too!

Thanks!
Carthik