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Old 08-02-2021, 06:50 AM   #21 (permalink)
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Quote:
Originally Posted by TomazB View Post
Yeah these posts come up often...but guess what, there must be a reason. There is little help in having a thermal gun if one doesn't know what tempearture to aim for. How about if manufacturers (Egodrift and XLpower) provided some more data of permissable motor working temperatures, like many other manufacturers do? That way people would know what is ok and what is too hot. Simple. Or else same questions will keep being asked here furter on in the future.
Just posted. And yet the question gets asked despite the info in the previous links. Someone should post that as long as you're under 300F you're good. You know, permissible working temp and all.

https://www.helifreak.com/showthread.php?t=891623
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Old 08-02-2021, 07:52 AM   #22 (permalink)
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The manufacturer’s list maximum temps for the components of thier motor’s. The temps we see IRL are no where near that, and never would be unless the motor caught fire. 160f / 180f motor temps on a hot summer day aren’t out of line. Adjust timing till the motor, and esc are their happiest. Gear up, or down if needed. I have the same motor in a Kraken 700, and it runs remarkably cool around 135f. While the ego 4025-550kv in my 580 hits 165f to 175f in the summer with optimal settings. Both motors run great, so temps don’t bother me much. I just try to get it as low as I possibly can, whatever that temp may be as long it’s not melting my canopy lol.
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Old 08-02-2021, 08:33 AM   #23 (permalink)
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yea - we probably don't have too much to worry about with the motor itself:

Melting points:
copper: 1084 c
Aluminum: 660 c

Assuming Neodymium Magnets, they probably present the largest worry: https://buntingmagnetics.com/industr...-magnets-take/ as they start to permanently lose their magnetism at temperatures above 100 c
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Old 08-02-2021, 08:38 AM   #24 (permalink)
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who said cooler is better? does the motor perform better when cold or hot? or is there no difference? lets see some data..
personally, i dont think theres a difference.
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Old 08-02-2021, 08:39 AM   #25 (permalink)
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Originally Posted by tonys-heli View Post
who said cooler is better? does the motor perform better when cold or hot? or is there no difference? lets see some data.. [IMG class=inlineimg]https://www.helifreak.com/images/smilies/cheers.gif[/IMG]
personally, i dont think theres a difference.

This!
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Old 08-02-2021, 08:44 AM   #26 (permalink)
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Quote:
Originally Posted by Ravmano7 View Post
Quote:
Originally Posted by tonys-heli View Post
who said cooler is better? does the motor perform better when cold or hot? or is there no difference? lets see some data.. [IMG class=inlineimg]https://www.helifreak.com/images/smilies/cheers.gif[/IMG]
personally, i dont think theres a difference.

This!
This:

Quote:
The Temperature Coefficient of Copper (near room temperature) is +0.393 percent per degree C.
https://www.cirris.com/learning-cent...ient-of-copper
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Old 08-02-2021, 10:49 AM   #27 (permalink)
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nobody is good enough to tell the difference between a cool running motor and hot. if it made a difference, we would warm up our motors before flight, or or try cool them down even more.

why does anyone even bother to touch their motor after a flight in the summer? just to say " its cool or hot "
it doesnt make a difference. some motors just run hot, doesnt mean something is wrong. most times their looking for a problem that doesnt exist.
no tight gear mesh or tail belt, proper gearing, fly the damn thing.
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Old 08-02-2021, 11:14 AM   #28 (permalink)
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Originally Posted by tonys-heli View Post
nobody is good enough to tell the difference between a cool running motor and hot. if it made a difference, we would warm up our motors before flight, or or try cool them down even more.
I disagree, why do the motor MFGs go though the effort of incorporating some kind of cooling into their designs.

One key factor of the motor is it’s resistance. The difference between a Xnova 4025-560 & a 4030-560 is (19-18= 1 mOhm) or a little over 5% in terms of resistance. This means a 4030 running 14C warmer than a 4025 will have similar performance. But it’s a catch 22 because the 4030 is less likely to warm up as much so not only does the 4030 run cooler keeping the motor resistance lower but the resistance is lower to start.

So the question is, can you tell the difference between a 4025 and a 4030?
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Old 08-02-2021, 11:41 AM   #29 (permalink)
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the 4030 is obviously bigger. i have done back to back flights in my yard with both motors, they felt the same to me.. i dont fly 3d, but i didnt check temps as i dont care how hot a motor gets, just flips and punch outs.
i wouldnt use a 4030 where a properly geared 4025 would work.
i prob cant tell the difference between a 4025 and a 4030 both geared correctly in a 3d setting, im just a sport flyer.

i understand the fin thing, thats not my point. some motors run hot. my scorpions always ran hot. not all my xnovas were cool. no big deal. use telemetry and gear it for optimal performance. is somebody gonna spend 200$ or so just to have a cooler running motor and same performance as a hot one? not me.
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Old 08-02-2021, 10:25 PM   #30 (permalink)
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My daily email from Amain brought this tidbit:

Quote:
There is a delicate balance between bottom-end torque and top-end speed when it comes to electric motors. In the pursuit of higher speeds, you can easily end up over-gearing your car and over-heating your motor.

Safe operating temperatures for electric motors are around 160-170F (71-77C), depending on the motor. One way to help keep it cool is by adding a Motor Fan and/or Heatsink.
Granted it’s for cars not helis
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Old 08-02-2021, 10:47 PM   #31 (permalink)
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Stock electric racing is very competitive. The fast guys have to gear for every track.

They only care about over temps because its slows them down!
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