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-   -   MM/Neu...just make somes test (https://www.rc-monster.com/forum/showthread.php?t=8371)

david lamontagn 10.30.2007 11:44 PM

MM/Neu...just make somes test
 
OK, first, my revo is almost done, the only thing missing is my MGM16018. But tonight, i've my MM sit on my table on my workshop, and i decided to give it a try with my Neu 1515, 1Y.
I'am geared 16/38 and you know what???
NO COGGING AT ALL:intello: It start verrrrry smooth from a dead stop, and accelerate like a beast!!!!
This FlightPower EVO25 have moooooooooore power than my old 6000mAh, 14.8 maxamps pck.
I'am very happy with this pre-test and i don't know why i've spend $300.00 on my MGM:whistle:
Anyways, i'll put the MGM in the truck as soon as i'll recieve it, and i'll keep the MM like a spare, because i think that MGM is very long for services:eyes:

bdebde 10.31.2007 12:36 AM

That's good to hear! Is it a new MM or an older one?

Happywing 10.31.2007 07:31 AM

Doesn't surprise me. We have a bunch (and I mean a bunch) of guys around here (including myself) that run a Neu/MM combo without cogging. We re-wire the controller with 12ga and direct-solder. Add some good batts and the right MM settings, and you're good to go. The Neu/MM "problem" is way overblown.

mkrusedc 10.31.2007 09:25 AM

Quote:

Originally Posted by david lamontagn (Post 126210)
OK, first, my revo is almost done, the only thing missing is my MGM16018. But tonight, i've my MM sit on my table on my workshop, and i decided to give it a try with my Neu 1515, 1Y.
I'am geared 16/38 and you know what???
NO COGGING AT ALL:intello: It start verrrrry smooth from a dead stop, and accelerate like a beast!!!!
This FlightPower EVO25 have moooooooooore power than my old 6000mAh, 14.8 maxamps pck.
I'am very happy with this pre-test and i don't know why i've spend $300.00 on my MGM:whistle:
Anyways, i'll put the MGM in the truck as soon as i'll recieve it, and i'll keep the MM like a spare, because i think that MGM is very long for services:eyes:

Good to hear David! Glad things worked out.

david lamontagn 10.31.2007 12:45 PM

Quote:

We re-wire the controller with 12ga and direct-solder.
I'll try it, thank you:intello:

crazyjr 10.31.2007 07:56 PM

I think its because, you are using the Y wind. I seen those with the D winds have a lot of trouble. gearing helps as well

david lamontagn 10.31.2007 09:01 PM

Don't know the difference between the "Y" and "Delta" winding and cogging effect.

entjoles 10.31.2007 09:21 PM

also running the revo 2 spd. should help, great to hear btw

suicideneil 10.31.2007 10:25 PM

The Y and Delta winds use the same number of wires, as it were, but are configured differently to produce a higher or lower Kv rating. How this effects cogging exactly I dont understand either- maybe its like more agressive timing vs softer timing, but in the actual motor and not via esc programming?.... whatever, the only reason no to use the MM esc is simply down to voltage and current draw limitations, but it all depends on how hot & hard you drive I guess.

david lamontagn 10.31.2007 10:28 PM

Ya, my driving style is very "soft". Never nail the trigger from dead stop.
I'am a track racer, and like to put lot of expo on the Tx to keep the thing controlable:yes:

Happywing 11.01.2007 07:39 AM

Quote:

Originally Posted by crazyjr (Post 126360)
I think its because, you are using the Y wind. I seen those with the D winds have a lot of trouble. gearing helps as well

Mine's a "D" and it works fine.

jnev 11.01.2007 12:55 PM

Happywing - what is you set up that you are using? Any tips to keeping the cogging to a minimum?

MetalMan 11.01.2007 01:48 PM

The 1512 2.5D on MM in my buggy works well also. There is occasional cogging, but I don't race (and if I were to, the buggy wouldn't be stopped much at all).

mwry13 11.01.2007 02:00 PM

I'd also like to know what your MM settings are too actually ^_^ im actually putting mine together right now

lutach 11.01.2007 02:53 PM

Please post the settings you guys are having success with. I ran the MM on a 6 pole Plettenberg with no cogging issue what so ever. My settings are:

Brake/reverse type: Proportional w/o reverse
Brake amount: 40%
Start power: Low
Motor timing: Normal

mkrusedc 11.01.2007 04:46 PM

I found that a linear throttle curve was a problem because I have a "heavy trigger" finger. IIRC at the 30% point hold with the left mouse button and pull down so that the results is a soomth curve upwards.

MetalMan 11.01.2007 05:33 PM

I don't have the MM in front of me (and it's at home, I'm at school), but I think the settings are:

-High start power
-30% punch control
-timing I'm not sure of, but I think I have it at medium
-linear throttle curve
-60% brake

mkrusedc 11.01.2007 09:12 PM

The cogging was helped tremendously by making the throttle curve exponential. My settings were:
brake 30%
punch 80%
start pwr high
motor timing low

Happywing 11.01.2007 09:13 PM

Quote:

Originally Posted by jnev (Post 126495)
Happywing - what is you set up that you are using? Any tips to keeping the cogging to a minimum?

MM/Neu 1512 2d/f 2600kv geared 11/46

Brake 30%
Punch Control 40%
Start Power Med
Drag Brake Disabled
Motor Timing Normal

We have found that pinion size has a lot to do with cogging. I have a high Kv motor in order to run a small pinion. Mine had a slight stutter in my first buggy. My present buggy is almost a pound lighter and the stutter has disappeared. If you can reduce weight and rotating mass, it helps.

mkrusedc 11.01.2007 09:17 PM

Quote:

Originally Posted by Happywing (Post 126579)
MM/Neu 1512 2d/f 2600kv geared 11/46

Brake 30%
Punch Control 40%
Start Power Med
Drag Brake Disabled
Motor Timing Normal

We have found that pinion size has a lot to do with cogging. I have a high Kv motor in order to run a small pinion. Mine had a slight stutter in my first buggy. My present buggy is almost a pound lighter and the stutter has disappeared. If you can reduce weight and rotating mass, it helps.

I ran into that problem with the NEU in mynE-Maxx. The larger diameter motor hits the tranny and precludes smaller pinions. IIRC a 17t pinion was the smallest I could get to mesh.

Happywing 11.01.2007 09:21 PM

Yes, I've heard that is a problem with the Emaxx trans. A smooth can motor would allow a smaller pinion, but I don't know how small.

lutach 11.01.2007 10:35 PM

One thing I noticed that might be causing all the cogging is the stregth of the magnet on some motors in conjuction with the stator.

johnrobholmes 11.01.2007 10:46 PM

Quote:

Originally Posted by lutach (Post 126596)
One thing I noticed that might be causing all the cogging is the stregth of the magnet on some motors in conjuction with the stator.


I was talking to Joe down at castle today, and he mentioned this as well. The gearing is sensitive for consistent loaded down startups.

BP-Revo 11.01.2007 10:52 PM

Well, this is one thing I notice with the Tekno conversion. It utilizes the stock Revo clutch which allows the motor to rev up before actually having any load on it at all, which would reduce cogging quite significantly, if I'm correct.

BrianG 11.02.2007 12:08 AM

But, given the torque of BL, wouldn't that put considerable stress on the driveline? I suppose you could dial in some slip to fix that though...


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