MMM v3 into therminal + hot motor??? - RC-Monster Forums

Joram · **MMM v3 into therminal + hot motor??? -** 04.02.2009, 05:22 PM

Hey,

I was today bashing with my savage, till suddenly the car stopped. I heard the fan spinning and after a few seconds the car didn't moved at all, therminal shutdown...

The motor gets also very warm> 60+ degrees(140 +F). It even becomes more hot when you stop the car, when you drive it cools down....

Who knows what to do? gearing up will make the motor even hotter i think???
Or what else to do to get the ESC cool and the motor a bit cooler.

Greetz,
Joram

lincpimp · 04.02.2009, 05:29 PM

It would help if you gave us more info? Is this the motor in your xmod, or your full size electric car? Or maybe a cordless toaster?

e-mike · 04.02.2009, 05:31 PM

for how long did you run..before this thing happen????and what kind of motor it is????

and the setting of your esc???

MetalMan · 04.02.2009, 05:32 PM

A smaller pinion gear will help lower ESC temps. But first make sure there isn't any binding in the transmission/differentials/bearings as binding could be the cause of excess heat.

e-mike · 04.02.2009, 05:32 PM

Quote:

Originally Posted by lincpimp

It would help if you gave us more info? Is this the motor in your xmod, or your full size electric car? Or maybe a cordless toaster?

loll
your faster than me

Joram · 04.03.2009, 02:05 AM

@Lincpimp, read the text, i really said i ran with my SAVAGE,

I use a Savöx 4570 motor, 1800kv on 5S lipo.
Drove about 10-15 minutes when it suddenly happened.

The driveline is OK, runs normall....

Settings of the ESC are:

Brake setting: 3
Brake amount: 50%
Reverse amount: 70%
Punch control: disabled
No drag brake
Start power:HIGH

Greetz,
Joram

04.03.2009, 03:09 AM

first thing reduce your start power to the lowest setting, this will lower your temps, and what is your gearing?

MetalMan · 04.03.2009, 03:17 AM

You can try lowering the start power to medium and punch control to something like 30%. These two alone should help a lot.

Joram · 08:17 AM

I was planning to adjust the start power to medium.

I'm also going tu se an UBEC, so that is also a lower temp. factor!

Gearing is btw, 18/47 (16/47 but I run Cen diff's)

Greetz,
Joram

Metallover · 04.03.2009, 08:19 AM

The mmm already has a built in, but separate switching bec so using another one won't do anything.

Joram · 04.03.2009, 08:24 AM

It will lower the temps, it is tested!

It is in the print so it makes heat, if you won't use it won't heat the whole thing...

Greetz,
Joram

Metallover · 04.03.2009, 08:41 AM

I'll try to explain again... Escs like the Mamba max and about every other esc that has a built in bec WILL get lower temps from an external bec. The mmm is different then all the other escs. It has a separate bec built into the bottom of the case. The bec shouldn't produce much heat at all...

Joram · 04.03.2009, 09:00 AM

We will see, before problems with the MMM where the Switching BEC....

Don't say my problems are cause of that, but i prefer an UBEC above the BEC from an speed controller!

Greetz,
Joram

Jeremy1976 · 04.03.2009, 09:38 AM

Sounds like you got her all figured out then.

MetalMan · 04.03.2009, 11:32 AM

The MMM has a UBEC built into it as Metallover stated. If you go with an external UBEC your temps might drop by 1 deg. F, if that. Hardly worth it IMO. And the problems the MMM used to have with the BEC have been completely resolved, so the only reason I can imagine using an external BEC with the MMM is if you have a V1 or V2 MMM.