MMM killing motors?

[Nephre]

Originally Posted by What's_nitro?

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 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

[TruckBasher]

Originally Posted by What's_nitro?

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.

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

[DRIFT_BUGGY]

What were the MMM settings?

[phatmonk]

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?

[Nephre]

Originally Posted by DRIFT_BUGGY

What were the MMM settings?

[Hakan_J]

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!

[phatmonk]

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

[Nephre]

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:

Originally Posted by Nephre

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!!

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

[What's_nitro?]

Originally Posted by phatmonk

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?

Originally Posted by Hakan_J

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!

WOW! 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!

[Pdelcast]

Originally Posted by What's_nitro?

WOW! 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!

AND destroy your motors TWICE as fast!

(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...)

[suicideneil]

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

[Pdelcast]

Originally Posted by suicideneil

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.

[What's_nitro?]

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 , I think it may be worth trying different combinations and seeing how they perform.

Originally Posted by Pdelcast

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...

Yeah, they probably don't hurt.

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

[lincpimp]

Originally Posted by azjc

... the dieing of the ESC.......

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