Also: Subject: Newbie from Norway building JR e-trials bike.Subject: Electric Surf Boardblisspacket wrote:I had a bright U of Fl student point out to me that surrounding an outrunner motor with aluminum is a no-no. I don't know if yours might be set up that way. There are magnetic influences within the outrunner which get messed up when contained within aluminum. The practical test to illustrate this: drop a neodymium magnet through an aluminum tube. You'll observe that there seems to be less gravity within the tube, and the magnet drops markedly slower than just letting it go in free air.
Dauntless wrote:I'm dying to hear you say that motor holds up under serious dirtbiking.
Did you hollow out the original engine or is that a new housing?
gogo wrote:Does that motor have sufficient back iron to prevent eddy currents from heating the aluminum engine case surrounding it?
[EDIT] I seem to recall someone having problems with the heating of surrounding stationary metal in a similar setup and mentioning that those type of motors are usually mounted in the air without anything near them, so the motor designers don't need to spec to prevent flux leakage.Also: Subject: Newbie from Norway building JR e-trials bike.Subject: Electric Surf Boardblisspacket wrote:I had a bright U of Fl student point out to me that surrounding an outrunner motor with aluminum is a no-no. I don't know if yours might be set up that way. There are magnetic influences within the outrunner which get messed up when contained within aluminum. The practical test to illustrate this: drop a neodymium magnet through an aluminum tube. You'll observe that there seems to be less gravity within the tube, and the magnet drops markedly slower than just letting it go in free air.
gogo wrote:Someone suggested running the motor without load while its installed, and then 'open -air', and measure the current difference. While you have the motor 'open-air' you can hang a paperclip on a string and hold it close to see if there's 'some or none' flux present.
querlenker wrote:Any news about this nice project?
livetek wrote:Awesome !! That's a monster !
Can you make more vids ? Thanks !
Hi,louis raaijmakers wrote:hi,
nice project you made here!
i am also planing of doing this but then with a streek kart and an brushed motor and a 48v 300a controller.
do you need al gears? and what do you recomend a gearbox from a 150cc moped? or do i need to look in 500cc gearboxes?
greetings louis
jase1979 wrote:What make / brand is the original bike? Great build.
Exactly it's like a Pit bike.jase1979 wrote:It's a small bike though. I don't know much about dirt bikes. Is its like a pit bike or a kids motorcross like a kx80? Cheers
The motor works well, I use a ventilator to cooling, the temperature remains acceptable into the gearbox approx. 60 - 80 °C (it depends on the outside temperature).Dauntless wrote:How IS the motor doing? Anyone have a mileage to hope for it holding up?
