MMM Combo 2200 a lot of cogging... - Page 2 - RC-Monster Forums

BrianG · 01.30.2009, 03:03 AM

From far away, my g/f thought it was a bowl of ice cream with stuff on top! So yeah, maybe a better pic with the macro setting?

Topas · 03:11 PM

Maybe I expect too much ... here is a video of the "cogging" Castle 2200

http://de.youtube.com/watch?v=QR02Vf7Mw8Y (watch it in HD !)

johnrobholmes · 01.30.2009, 03:34 PM

You are just at very low throttle before the motor breaks the magnet/ pole attraction- so it looks to me. Once it is above that minimum rpm do you have any studdering issues?

Topas · 01.30.2009, 03:44 PM

Quote:

Originally Posted by johnrobholmes

You are just at very low throttle before the motor breaks the magnet/ pole attraction- so it looks to me. Once it is above that minimum rpm do you have any studdering issues?

Yes ... the studdering is only at a very very low throttle .... When the motor starts I have no issues ;)

E-Revonut · 01.30.2009, 03:47 PM

Quote:

Originally Posted by Topas

Maybe I expect too much ... here is a video of the "cogging" Castle 2200

http://de.youtube.com/watch?v=QR02Vf7Mw8Y (watch it in HD !)

That is not cogging! Have you tried it in your car? Motor/esc needs a minimum RPM to establish rotor position and function properly. cars/trucks/buggies all use gear reduction so that's not to much of an issue. I have aprox a 13:1 reduction on my REVO so every 13 turns of that motor only turns the wheel once. without a load on the motor you are going from nothing to about 20,000RPMs!

BrianG · 01.30.2009, 03:54 PM

Ok, that video helps.

Increasing the start power setting in the MMM will help with that. Being sensorless, the ESC needs to see a certain amount of rpm to know where the rotor is. Increasing the start power will "tickle" the motor a little more to spin it up so it will get an rpm reading faster.

This thread will explain the MMM settings in more detail if you want.

You are gonna have a tiny bit of cogging at very low speeds no matter what you do. Usually, this isn't a big deal since most people don't run these systems at ~1mph, not to mention ESCs/motors are not nearly as efficient at partial throttle anyhow.

Topas · 01.30.2009, 03:56 PM

Ok, but the NEU 1515/1/Y runs a little smoother ;)

Hardstyle · 01.30.2009, 05:40 PM

I have wondered myself too that little clitch, running at very slow speed. Really aren't a problem unless if you wan't to crawl with it

emaxxnitro · 01.30.2009, 06:09 PM

Quote:

Originally Posted by sleebus.jones

Holy out of focus picture batman. I think I can see something there but I'm not sure.

sorry cell phone

i believe if you change the pinion to 13t the cogging will be much less due to gear reduction and the thing will still fly.

Quote:

Originally Posted by E-Revonut

That is not cogging! Have you tried it in your car? Motor/esc needs a minimum RPM to establish rotor position and function properly. cars/trucks/buggies all use gear reduction so that's not to much of an issue. I have aprox a 13:1 reduction on my REVO so every 13 turns of that motor only turns the wheel once. without a load on the motor you are going from nothing to about 20,000RPMs!