Direct Drive to Diff E Revo Build

[Mod Man]

Most outrunners are capable of around 20,000 RPM. That is true for most Orbit outrunners as well as AXIs. That is due to magnetic saturation. Beyond that heat tends to build up and efficiency goes way down.

Much depends on each individual motor, though.

EMF is "Electro-magnetic-fequency". Back EMF is the back pulse the motor creates as it rotates. A motor requires voltage to run, but it also creates voltage as it spins. This voltage is read by the ESC to give a rough calculation of the motor's RPM thus eliminating the need for position sensing. Software is EXTREMELY important in eliminating cogging as is high torque capability of the motor. High voltage normally reduces cogging as well.

Matt

[sikeston34m]

Hey Modman Was that the AXI 4120/18 that you were running?

It's the only one that I see with a 515kv rating.

[sikeston34m]

I thought I would show you the difference in the Outrunner used in the E maxx 40mph setup (direct drive to transmission) and the AXI 4130/20 that is going in the Revo. Big Difference!

[Mod Man]

Originally Posted by sikeston34m

Hey Modman Was that the AXI 4120/18 that you were running?

It's the only one that I see with a 515kv rating.

I believe so. I will check it and get back to you. It is not here at the house.

That motor has alot of use on it. It started in a twin rotor helicopter, then it proceeded to run my truck, now it is running the head of my Taig CNC. :)

I love outrunners.

Matt

[sikeston34m]

Here's a few pics of the progress. Still in it's rough form. I plan to line the lower part of the battery tray with the "loop" side of some velcro. This will cover up the counter sunk screw heads and help protect those precious Lipo's.