MMM killing motors?
 

Anyone else that have had their motor ruined by the MMM?
I´ve got a MMM from the first batch that I thought worked fine untill today when it killed my third feigao. First it killed my 7XL in late may and I didn´t think anymore about it, Feigaos aren´t that great to be honest, they are cheap but the quality leaves more to ask. Ordered a Neu from CC, thought that I´would get myself something better and while I waited for it to show up I threw in another feigao I had laying around, an 7L. It lasted for about half an hour but I thought that since it´s not as strong as something from the XL-series, it probably died from the abuse, I don´t think the L-series are ment to be in such heavy cars as an 8th-scale buggy. After a while I got tired of waiting for the Neu (still haven´t got it) so a few days ago I got myself an 8XL that lasted for about three packs before it gave up on me in a trail of white smoke. First I thought it was the monster that died but after a quick investigation I realised that the smoke came from the 8XL.
Later this evening I checked the monster with a smaller motor, plugged it in and gave it some throttle. Everything seemed fine for about two seconds, then it started to cog and threw quite a lot of sparks and flashes at me. Holy mother of god, this can´t be right!! Well, I came to the conclusion that the monster probably killed all of my motors and I really don´t want to kill my Neu as well so I´m sending it back to CC, hopefully I´ll get a new one when the second batch is ready (when it comes to be serviceminded, CC kicks some serious butt:smile: ).
Anyone else that had similar problems? Or heard of anyone that had these problems?

Edit:
Sorry about my english, I´m from sweden and I guess that my english can be quite...swedish :wink: :whistle:

me too:lol:had this problems....kill one 6xl and 7xl(reach 300f both motor:surprised:)totaly kill the magnet inside:mdr:

do you have kill your mmm????

It may not be the controller; what kind of temps did you have? You are checking temps on a new set up right? Any motor's magnet will die if you get it too hot.

I would just think that the MMM is letting the motor have all the amps it asked for whereas before you might have been throttled by the ESC.

I would check your gearing and double check your batteries as they must have been working hard...

I have heard there is less resistance within a MMM than a MM so maybe that could be the case

Well, it was kind of high (very high in fact) but thats another strange thing about this. I´ve got two buggies now, recently got the other, a Mugen MBX5 Prospec, bought it from a guy here in sweden and a week later I bought his 8XL to, the very same motor he had used in this car and as far as I know he´haven´t had the temp getting over 60C/149F with the same gearing as I have. But when it died today it was so hot that you could fry an egg on it. Tried with some saliva and it just fizzed away

it would be helpful if you give us more info...gearing,voltage of batteries, wheel size, etc

Mugen MBX5 Prospec
14/46
Polyquest 4s 4500mah 30-50c
Feigao 8XL
4.45" Wheels (basic 1:8th buggy wheels)



Thank for all the help by the way, I knew I could count on you guys :yipi:

Make sure your mountng screws arent touching the windings inside the motor, as that will have rather negative results too...

my MMM smoked my 8xl also. The 8xl was at 270 degrees when it died. I was running setup in gmaxx on 5s lipo.

I recently switched to the neu 1515 1y and motor has not run pass 170 degrees on same truck. I don't think it's the MMM that's smoking the motors. Like previous post, I think the MMM doesn't throttle back the amps to the motor so you really need to make sure your motor is top quality or you gear appropriately.

Surprisingly I had an issue with my Neu 1512 2.5D/F and MMM. At one point on the track it was cogging VERY badly at startup. Normally I would just go over to it and check out what was wrong, but the cogging was intermittent. When I finally took temps, my Neu was at 220 deg. F and the MMM was at 190! Normally that same setup would've been 160 for the Neu and ~140 on the MMM. I let everything cool down, and all was fine... I have no idea.

when I ran the MMM for the first time I had the timing on the default setting which was set at 10 and the motor was between very warm and hot, I lowered it down to 0 and it gets a little warm after a 30 min bash session

All this talk about the MMM "not holding back the amps" is cracking me up. :rofl:

Guys, you dont want an ESC to hold back. That makes it less efficient. It's true the MMM uses FETs with a much lower resistance than the MM does. Therefore the motor will draw more power. I think it's impossible that a controller can outright ruin a motor unless there is a problem with the programming that makes it cog like hell. Which you would obviously notice BEFORE it fried your motor and you would stop driving.....

Definitely make sure the motor screws aren't too long. That has been a common problem around here with the Feigaos. If all is well then just face the fact that Feigaos are cheap and if you overload them they will get really hot and fail. Done. The MMM is not at fault here.

i had a 7 ( or 8 whoknows )xl in my xt8 with MMM on 4 and 5s with no problems. geared way too fast to race also.( ask mike lol) it did get hot though as I had to keep a fan on it.

hmm when my mmm worked it push my erevo on 4s to 53 with a 8xl on 20/38 and motor temps never hit 130 esc was 98 batts 97 and i was running talons then one shredded at 45. i was gonna try 22/38 to se if i could hit 58 but then the mmm failed.

I hope you´re right but it did cog quite a lot. The first two packs ran smoothly, no cogging or heating problems at all. Sure, the motor got warm but not that warm. But on the third pack thing changed, at first it was at smooth as before but then suddenly it started to cog. Stopped and tried again and it cogged. Tried one last time and...FIZZZ...

But you´re right, Feigaos are basicly crap, they´re cheap but thats really the only good thing about them

What bugs me is that all three motors I´ve been running with the monster have lasted for about three packs before they´re history. Even the last motor , the previous owner ran the very same motor in the very same car, same gearing and everything exept for the esc and he never had any heating or cogging problems at all, but then when I plug it in to my monster it lasts three packs before it´s dead

Definitely an issue with Feigaos

I havent run my 8XL again but i noticed this when I was mounting it on the E-revo...it damaged 1 wire...I will try to run in soon (E-revo currently out of commission) and see if it will have the same result

What were the MMM settings?

I noticed that my Neu 1515/1.5d was running hotter with the MMM.It actualy seems to run cooler with the MM.Less amps I assume?:whip::diablo:

I reacently smoked my Lehner 1940/7 which I have been running for about a year on MM.
When I changed to MMM the Lehner got a lot hotter and in the last run too hot I guess :(

My Tekno NEU 1515 1y will probably arrive next week so I hope I wont have any issues with that one!

I had the setting set the same on my Mamba Max and Mamba Monster.I run the lowest setting on the timing.

I´m going to try to get another feigao just to try again, never really thought of lowering the timing (don´t know why really, should have done that a long time ago). Anyone got an 8XL to sell? Otherwise I have to go with an 7XL but I think that one is going to get warm no matter what

Although, I m a bit spooked by this:

That doesn´t seem right to me...
But what the heck, the feigaos are so cheap anyway, I might as well give it one more try before I send it back :whip:

WOW! :surprised: That's all I can say.

I don't remember the actual numbers regarding the difference in the RdsON of the MM's FETs versus the MMM's FETs, but apparently it's a large enough difference to allow all of the "HOT" motors we run to draw ALL the current they want! Probably due to lower current-rise time, lower FET inductance, capacitance, etc. w/e. Anyways it's only a good thing. It means we can probably run a lower voltage or a slower motor and still make as much or near as much power with the MMM as we did with the MM, and thus not notice any decrease in performance, while being more efficient to boot!
:mdr: :yipi:

AND destroy your motors TWICE as fast! :whistle:

(I think a lot of the extra power comes from the 10ga wires and the large connectors -- they are nice and low resistance and inductance...)

Huh, I dont get that? Should we be running less powerful motors to compensate for this phenominanonmoomna m, or... ? Im a bit stumped here....

No -- lower gear ratios, and lower timing. Whatever keeps the motors cooler.

Do I have it backwards? Granted the options we have for motors and battery voltages may not be precise enough to realize the added efficiency of an ESC with a lower on-resistance. Lower resistance means the ESC wastes less power as heat. Normally it would be a marginal difference but seeing as how there are quite a few reported "cases" of this phenominanonmoomna :oops:, I think it may be worth trying different combinations and seeing how they perform.

Yeah, they probably don't hurt. :wink:

I have run the MMM with a quality motor and packs and have had no problems except for the dieing of the ESC.......

Had to laugh, sounds like an ancient chinese ritual that has been passed down for generations:lol:

I noticed that my hacker 7xl was running quite warm with the MMM as well. Like feigao temps:tongue:

I have a neu 1515 1.5d to try out...

could some kind of internal(esc) short kill a motor.

No. That would just burn up the ESC.

I got my Neu yesterday and took it for a test drive, after 15minutes the temp was 125F, but the real test will be this weekend at the track!

I will post my temps after the weekend.

a 1515/1y on 4s shouldnt get that hot...try it on 5s for some excitment...:lol: