How hot is too hot for the ESC and Brushless motor? - Page 2 - RC Groups
Shop our Airplanes Products Drone Products Sales
Thread Tools
Apr 09, 2010, 12:14 PM
Suspended Account
i give up
Sign up now
to remove ads between posts
Apr 10, 2010, 12:47 AM
jettrooper02's Avatar
i did say it wasn't a good fix. but it will help a little, just like anything else mentioned would.
Apr 10, 2010, 09:33 AM
Suspended Account
Quote:
Originally Posted by jettrooper02
i did say it wasn't a good fix. but it will help a little, just like anything else mentioned would.
As several others mentioned, the rule of thumb to follow to make a drastic change in temps is to "gearing down some on the pinion" until the temps get in the tolerable range. Everything else is like putting a band-aid on a broken arm... might help ever so vaguely, but not really address the issue at hand.
Apr 10, 2010, 11:31 AM
jettrooper02's Avatar
yes. as i said. but if your only a few dergrees from where it's good, and the gearing is so low it is unable to not wheely, it might be a good idea to use a cooling fan to bring it down a little more.

wait, what tires are you running? if htey are bigger than sc tires that would explain it, because the motor then has to move more wheel hich requires more work. i know it will sound wierd, but the tire size has a part in the vehicles speed. for instance, i'm running 2.2 tires on a savage. it goes slow. bring those up to jumbo kongs, now it's fast. i can't remember exactly what it's called, but i know it's right.
Apr 10, 2010, 12:38 PM
Suspended Account
Quote:
Originally Posted by jettrooper02
yes. as i said. but if your only a few dergrees from where it's good, and the gearing is so low it is unable to not wheely, it might be a good idea to use a cooling fan to bring it down a little more.
25 degrees is more than 10% over the max recommended temp, so it's hardly a just "few" degrees

it's impossible to go "so low it is unable to wheelie" since the basic premise of lower gearing is that it allows for quicker take off speeds.
Apr 10, 2010, 02:31 PM
jettrooper02's Avatar
of you didn't notice, i said unable to NOT wheely. lol lol lol. next time read my post carefully.
Apr 10, 2010, 06:54 PM
Suspended Account
next time you might might try not writing "double negatives"

"A double negative occurs when two forms of negation are used in the same clause. In some languages (or varieties of a language), negative forms are consistently used throughout the sentence to express a single negation. In other languages, a double negative is used to negate a negation, and therefore, it resolves to a positive."
http://en.wikipedia.org/wiki/Double_negative

roflol
Apr 10, 2010, 08:37 PM
Closed Account
Quote:
Originally Posted by mini-Rob
next time you might might try not writing "double negatives"

"A double negative occurs when two forms of negation are used in the same clause. In some languages (or varieties of a language), negative forms are consistently used throughout the sentence to express a single negation. In other languages, a double negative is used to negate a negation, and therefore, it resolves to a positive."
http://en.wikipedia.org/wiki/Double_negative

roflol
Can't see a ''double ban'' being a positive in any way, shape or form.
Click here for the forum rules. Here for clarification, and a specific quote:

Quote:
Banned Users Aren't Users

User moderation and bans are often the subject of discussion. If a user is banned he is not protected by the personal attack rule. It is perfectly ok for other users to discuss the ban and the user receiving the ban.

We can call this the "fair game" exclusion to the personal attack rule. During the period of a ban, the user is not considered a user. He is "fair game" instead.
Go here to find the recent infractions list.

Attachment 3175800

Thread derailment. Sorry.
Last edited by Jonathan Bradbury; Aug 18, 2010 at 05:03 PM.
Apr 11, 2010, 12:08 PM
jettrooper02's Avatar
don't be, that was very good to point out.
Apr 12, 2010, 02:12 AM
Under Warranty!
2sicMiniT's Avatar
I used a small fan on my mini revo, I have it rather aggresively geared and I will say that although it does not cool it down drastically the important thing to factor in is that it provides a "constant" airflow over the heatsink. I had some temp shutdowns before using the heatsink and fan. After using the heatsink and fan, I had much longer run times before any heat interferance. Using a fan never hurts.
Apr 16, 2010, 12:35 PM
FPV Noobie
Phishnvdub's Avatar
Could binding in the drive train cause temps to be hot? Maybe the slipper clutch adjustment?
Apr 17, 2010, 02:43 PM
Suspended Account
Quote:
Originally Posted by Phishnvdub
Could binding in the drive train cause temps to be hot? Maybe the slipper clutch adjustment?
I'd have been happy to help, but I got
Apr 20, 2010, 11:12 PM
Under Warranty!
2sicMiniT's Avatar
Wow, sorry you could not get an answer to a simple question.

Yes, you want your drivetrain to be as free as possible. That is why in considering the best possible "gear mesh" is the closest to your motor as a source of possible "binding."
Make sure everything moves freely and you will run with minimal heat. Next step is gearing and then voltage.
May 19, 2010, 07:58 PM
Registered User

Update


Finally got some time to play today. Same set-up, except using a cooling fan for the ESC. I did not run it till it went into thermal shutdown or low voltage cut-off. About a 20 minute run then checked the temps.

The motor was 190deg F, Esc was at 135f and batt was at 92f.

I think what happened before was that I ran it after the low voltage cut off had cut power to 50%. The manual also says that the ESC will go into thermal shutdown, level one cuts power to 50%, level two shuts the motor off.

My Question, are these new temps "OK" after a 20 minute run.
May 19, 2010, 08:49 PM
Under Warranty!
2sicMiniT's Avatar
Only temp I would really worry about trying to bring down is the motor. Get yourself a wraparound heatsink to help disipate the heat. This will at least help pull the heat away from the heat sensitive components. Your ESC temp is good and batt is not bad.

Strange thing that I have wondered for a while now is why I had setups when I first started with rc that ran lipos that were warm, but now they run cool. I wonder if this is because I don't use small wires anymore? What size wires are on your lipo?\

Your real test will be in the heat of summer, what your temps will be then. I wonder.

Good Luck.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion how hot is too hot for esc and motor rmasu Mini Helis 4 May 22, 2006 05:48 PM
Zoom brushless motor: How hot is too hot? Mr.RC-CAM Mini Helis 16 Oct 08, 2004 07:24 PM
How hot is TOO hot for a bl motor? Silverstreak328 Micro Helis 16 Sep 29, 2004 09:50 PM
How hot is too hot for motor? skyhawk Electric Heli Talk 6 Aug 11, 2003 12:26 AM
How hot is too hot for a SP400 motor? Steve Fehr Electric Plane Talk 4 Oct 22, 2001 04:56 PM