Custom (very) Quark esc heatsink... - Page 2 - RC-Monster Forums

Procharged5.0 · 04.04.2007, 01:36 PM

That could explain why so many have heat issues.

zeropointbug · 04.04.2007, 03:00 PM

WOW I did a bench run of the motor, almost full throttle with 16.5 volts. The motor got so hot I could only touch it for barely 1/2 second.

The esc on the other hand never got warm at all, the heatsink seemed like it was a a couple degrees warmer than it was before i started (10 mins). I looked at the eagletree, it consumes almost 140 watts no load, running just about full throttle, so almost all of that power is wasted as heat, 140 watts is alot!

The heat spreader on the other set of FET's got about 45 C , to the touch, just a guess, but that bottom set just stayed VERY cool.

What temp would the motor be if i could only touch it for 1/2 second? I hope i never got it too hot. :013:

04.04.2007, 03:03 PM

Quote:

Originally Posted by BrianG

I see what you're saying. However, I personally would prefer to remove the motor wires so that I don't have to deal with the endcap when trying to reassemble. It's really not hard to desolder/resolder the motor wires - just gotta have enough heat to melt the solder quickly while overcoming the heatsink qualities of the wires/PCB traces. :)

I thought I'd mention the other way. Some people don't like to soldier and mine was brand new and wanted to disturb it as little as possible. This makes it quick and simple without soldiering.

After modded we could call it the 125C, C for cool.

Procharged5.0 · 04.04.2007, 03:03 PM

Do you have a temp gun?

How about a temp loop or sensor from the eagle tree?

If I were closer....I could loan them to you for the test.

04.04.2007, 03:04 PM

IIRC, you are NOT supposed to run the motor unloaded for any length of time at full throttle! It could possibly damage the motor! Just thought I'd let you know...

Bye:018:

zeropointbug · 04.04.2007, 03:11 PM

I know, but i did let off about 10% off full throttle. To keep the rpm safe limit.

ProCharged: I JUST ordered a duratrax flashpoint thermometer for $30, just happened to be on sale too (was $40).

So what is the max safe temp for the 540C 7Xl then? Does anyone know?

zeropointbug · 04.04.2007, 03:14 PM

Oh, and i forgot to mention. I DO have a temp probe for my eagletree, but I can't get it to read properly, wtf does 6064 mean, it's a straight line. I've tried many times, no luck. :032:

Procharged5.0 · 04.04.2007, 03:15 PM

Temp probe or loop?

zeropointbug · 04.04.2007, 03:20 PM

The probe, the small diode.

Procharged5.0 · 04.04.2007, 03:21 PM

Did you use thermal compound with it for heat transfer????

If not then that's probably the issue. If you did then perhaps the probe is malfunctioning.

Serum · 04.04.2007, 03:23 PM

50 degrees feels like burning your hand already. Having a BL motor run unloaded makes no sense. it's not considered a test, only a way to ruin the motor.

04.04.2007, 03:31 PM

I'm not real swift when it comes to some of these things, but I would think that running a motor on a bench will cause the motor to get hot from the sheer rpms that the motor is turning. Since you were running the motor unloaded, I would think that it wasn't drawing nearly the current that it would while in a truck going around a track during a race. This may have, at least partially, accounted for the esc running so cool.

Serum · 04.04.2007, 03:42 PM

running it unloaded is very unefficient for a motor, plus the high RPM's can damage the magnets.

Procharged5.0 · 04.04.2007, 03:46 PM

Quote:

Originally Posted by AAngel

I'm not real swift when it comes to some of these things, but I would think that running a motor on a bench will cause the motor to get hot from the sheer rpms that the motor is turning. Since you were running the motor unloaded, I would think that it wasn't drawing nearly the current that it would while in a truck going around a track during a race. This may have, at least partially, accounted for the esc running so cool.

This is true.

Running a motor under load increases current draw...more load, more draw.

zeropointbug · 04.04.2007, 03:56 PM

50 C feels like it's burning your hand? Well, then i would have to say the top heat spreader was only about 30 C then.

ProCharged: I did not use thermal paste, i used electrical tape on the motor, but still, that's not the prob. All i get for a reading on the PC is 6064, or 480 when plugged into the Temp2 socket.