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Old 08-26-2008, 05:49 PM   #1
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Default Upper temp limit for brushed motor?

What is the recommended upper temperature limit for a brushed mod motor?

Thanks!
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Old 08-26-2008, 06:10 PM   #2
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Anything above 230ish is getting too hot for any electric motor. The cooler you can keep your motor the better and longer it will last.
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Old 08-26-2008, 11:49 PM   #3
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180 degrees is getting hot for a mod motor. It will start burning the copper windings on the armature. Also pull the brushes too, and if they look purple in color that is also an indicated that the motor is running to hot. Now if u pull the car and feel the motor and u can keep ur finger on the can then ur gearing is ok.
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Old 08-26-2008, 11:53 PM   #4
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Originally Posted by BuggyKing View Post
180 degrees is getting hot for a mod motor. It will start burning the copper windings on the armature. Also pull the brushes too, and if they look purple in color that is also an indicated that the motor is running to hot. Now if u pull the car and feel the motor and u can keep ur finger on the can then ur gearing is ok.
+1
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Old 08-27-2008, 12:34 AM   #5
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Quote:
Originally Posted by T. Thomas View Post
Anything above 230ish is getting too hot for any electric motor. The cooler you can keep your motor the better and longer it will last.
You go over 170 degrees for a brushed motor and your brushes will be toast in one run! 230 degrees and I bet your brushes will unsolder themselves or you will melt a brush spring! Ask some of the on-road guys!


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Old 08-27-2008, 12:41 AM   #6
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Do you mean 170 F or 170 C ?
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Old 08-27-2008, 08:30 AM   #7
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170 F
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Old 08-27-2008, 08:43 AM   #8
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Originally Posted by BuggyKing View Post
Now if u pull the car and feel the motor and u can keep ur finger on the can then ur gearing is ok.
+1

Ye-Old Finger Test. I've been using this trick for 15+ years... It's a great method!
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Old 08-27-2008, 08:55 AM   #9
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Quote:
Originally Posted by JeromeK99 View Post
You go over 170 degrees for a brushed motor and your brushes will be toast in one run! 230 degrees and I bet your brushes will unsolder themselves or you will melt a brush spring! Ask some of the on-road guys!


Jerome
not always. I accidently hit 280 on a CO27 a few weeks ago after a 5 min heat. Wrong gearing on my part. I just regeared and ran fine. I might have been lucky but didnt hurt my brushes or springs or solder.
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Old 08-27-2008, 08:59 AM   #10
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not always. I accidently hit 280 on a CO27 a few weeks ago after a 5 min heat. Wrong gearing on my part. I just regeared and ran fine. I might have been lucky but didnt hurt my brushes or springs or solder.
I`m sure we all have done that a time or two , sometimes they are fine and sometimes not .
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Old 08-27-2008, 09:58 AM   #11
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Is the can temp usually lower than the end bell temp? If so, perhaps that is why the solder can melt at the end bell while only measuring 230 F at the can.

From http://www.tpub.com/neets/book4/12n.htm

Melting Point of various electrical solders:
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Old 08-27-2008, 10:17 AM   #12
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All good info, unless you're running a Reedy. Reedy motors have this propensity for running hot; my MVPs did a constant 170F all the time, it's just the way they are. And from what I can tell so far, the new Stockstars and Challengers are the same way.

I've heard that the reason the magnets don't die from the heat is Reedy sources their magnets from a different place than Trinity, and these magnets have a higher tolerance to heat. Whether that's truly the case or not, I'm not positive. But I can say in the 6 or so years I ran MVPs up until now, I never junked one because the magnets went bad. I blew one armature up and had a magnet pop off the side of the can (my fault, skipped the chassis off a curb at the end of my driveway), otherwise I only replaced them when the commutator got too small for any more cuts on a lathe, and they didn't sell armatures separately.
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Old 08-27-2008, 10:26 AM   #13
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can temp is always lower then endbell temp. i was taught to temp from can.
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Old 08-27-2008, 10:27 AM   #14
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I`ve never had a magnet problem and only problems from an overheated motor were the arm windings .
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Old 08-27-2008, 11:00 AM   #15
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I run all my motors at 150-160 just to be safe.
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