Motor heating issue... save my soul

[Vivek92]

I'm having some really... strange issue with motor heating all of a sudden and its happening under 0 load. After maybe 30-40 trigger pulls the motor is getting fairly warm and the general area where the connectors go is getting EXTREMELY hot.

The MOSFET has active braking which I assume is causing the fairly large arc when I let go of the trigger.

Specs: Tienly GT45000 Motor
11.1v LIPO 1200 mah 25c (50C burst) running through 16 AWG low res wiring
through a GATE 3.2 MERF Mosfet.

The battery is wired to tamiya right now, switching them to deans in the next day or so.


The wires going to my motor connector are soldered on vs crimped mostly because I didn't have any spares at the time so I just soldered the wires onto them.

[ThunderCactus]

That's normal. Motors get hot, fact of life.

[Vivek92]

How hot is TOO hot?

[ThunderCactus]

If it melts the solder holding the wires to your brush hoods, it's too hot.
Heat is caused by resistance in an electrical system, and a motor is basically just a great big resistor. The brush hoods are big resistors, the brushes are resistors, the armature is nothing more than a really long strand of wire. The commutator gets so damn hot you can't use anything less than silver solder. And the more current going through it, the more it'll heat up.
The motor in my 249 is a ferrous magnet eagle force, it's two major advantages are being energy efficient, and low in heat (because it requires less current to run), and I run that bitch so hot my hand starts sweating through my glove on the grip.

[Vivek92]

Thanks a bunch

Just one more lil thing. The arcing on active brake is supposed to happen correct?

[ThunderCactus]

Absolutely.