Motor and ESC normal temp

[White_Crow_G]

Hi All!
Another dumb question from some1 new to the hobby.
What is the normal temps for Motor, ESC and a Battery.
(i do have a termo-gun)
When to measure (after 1min running/ after 5 mins running/ after first pack)
Where to measure?
I do have some heatsticks on the motors and...what is the right spot to measure temperature?

P.S.
Just remembered - WHAT are the normal and max RPM's for the motor? all i read is about 40k is max, but...do anyone know WHY? why the number is 40k and not less/more?

Your help most appreciated!
Thank you guys!

 

[jojobeans]

In my experiences for brushless motors, 170°F maximum for motor temps if you’re using a budget system. Higher end motors like Hobbywing or castle, where they use better glue that’s a bit more heat resistant and will tolerate higher temps, although it drastically reduces their life. I’ve regularly ran my now 2 year castle 1515 at 190°f in my sledge with zero problems. But, I’ve had motors “debond” at 170°f on the real low end stuff. General rule of thumb is 160-170°f and should keep you safe regardless of what motor you buy. Use gearing to adjust temps, don’t rely solely on fans to keep temps in a safe range.

ESC’s on the other hand, I’ll be honest with you, I’ve forgotten. Most ESC’s are pretty over specc’d nowadays and I’ve rarely dealt with heat issues there as long as the fan is functioning. Good news is most modern quality ESC’s will shut down when they go over temp… I’d look in the manual to find out what temperature your ESC will thermal shut down at and keep it below that.

Max RPM’s will vary from motor to motor due to quality differences in the material and how well it’s balanced. You’ll likely never exceed that maximum under normal conditions. I wouldn’t worry too much about it.

 

[RustyUs]

Safe Maximum Temperature for Brushless Motors

I search for the hottest spot on the can when I take temp readings. It's almost always the end of the motor so I go with that area for my readings. I try to never allow motors to get above 180°F. I strive to keep motor temps at 160°F during spring and fall times of the year. The middle of summer, during the mid-day sun scorching ambient temps... 180°F maximum (if I can help it) for my motors.

A lot of my Hobbywing combos have thermal protection/cutoff for the motors... I've yet to see the motor protection kick in. I asked Hobbywing what was that "secret" number where the ESC cuts power to the motor... Hobbywing Speed Control's Overheat Protection For A Motor

 

[Greywolf74]

Personally, I don't like my motor above 165F and I don't like my ESC hotter than 160F max. I wouldnt push them much higher than that.

 

[White_Crow_G]

Thank ALL of you for your comments.

What i found in my ECS and Motor manuals is "its ok when tem not going over 90c for ECS and 100c for motor"
So i hope it's more likely - nothing going to happen in my case (45c for both)

 

[Hornet68]

How are you measuring the case temp on the ESC?

 

[White_Crow_G]

How are you measuring the case temp on the ESC?

just randomly shooting with a termo-gun.
But a used to be a barista, so my finger still remember what 60-65C is.

 

[Greywolf74]

Thank ALL of you for your comments.

What i found in my ECS and Motor manuals is "its ok when tem not going over 90c for ECS and 100c for motor"
So i hope it's more likely - nothing going to happen in my case (45c for both)
View attachment 236395

90C/194F is crazy hot for a motor and even crazier for an ESC. You start risking damaging your motor from delamination of the magnets at ~175F/78C. Just my .02