papabearflying
I have a 2200kv motor with a 30 Amp ESC running on a 2200mah Lipo, which gets very quickly too hot. I thought it was something to do with the prop size / prop balance but having tried it without the prop and after just about 30 seconds the back end of the motor still gets quite hot, I´m a bit miffed as to what´s the deal is? is it a bareings or the ESC? perhaps the timing? what can it be? Grateful for any feedback thanks.
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Boxermad84
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I have a 2200kv motor with a 30 Amp ESC running on a 2200mah Lipo, which gets very quickly too hot. I thought it was something to do with the prop size / prop balance but having tried it without the prop and after just about 30 seconds the back end of the motor still gets quite hot, I´m a bit miffed as to what´s the deal is? is it a bareings or the ESC? what can it be? Grateful for any feedback thanks.
First, what size prop are you using and second, never run your motor without a prop as it will over rev.



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dtribby
Over-rev? Never heard of it. At zero load, you get the true kv-rating out of it, but that's it.

I would lean toward either a bearing issue, or a faulty (not broken) contact somewhere generating heat under an amperage load.
Yes, I've known that I'm "different" for some time now...
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papabearflying
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Over-rev? Never heard of it. At zero load, you get the true kv-rating out of it, but that's it.

I would lean toward either a bearing issue, or a faulty (not broken) contact somewhere generating heat under an amperage load.


I´ve never heard of that either, how do you come on that idea??
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Boxermad84
Kv stands for revs per volt, this is theoretical. Read the 8th paragraph.
http://www.flyelectric.com/ans.kv.html

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F1wanabe
I've seen many members here warn against running a motor without a prop so the motor does not burn up. I think most motor manufacturers use bearings with specs based on operating with the load of a prop which is far less rpms than a motor without a prop.

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papabearflying
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I've seen many members here warn against running a motor without a prop so the motor does not burn up. I think most motor manufacturers use bearings with specs based on operating with the load of a prop which is far less rpms than a motor without a prop.

My youtube :
http://www.youtube.com/gstrysky[/quote]

I don´t run the motor without the prop, this happened in the air!
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GrumpyBear
Ok, electric motors 101.
The heat developed by an electric motor is directly proportional to load imposed.
An electric motor must have adequate cooling to dissipate the heat.
If the motor is not designed to run a 3 cell it will draw more than it's rated current and burn out. Your ESC will allow at least is rated current to the motor. (It don't care)
If a bearing is bad you increase the load thereby increasing the current. Current=heat.
So check your set-up. Are the vent holes at the rear of the motor obstructed? Is there sufficient air flow over the motor? The prop draws air past the motor and therefore helps to cool it so don't run the motor without a prop. Is the motor covered and is there adequate air flow? A larger prop then recommended will increase load which increases current draw which = heat.
One final thought, it might be a bad motor. GB.
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papabearflying
Thanks everyone for the feedback.
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LukeWarm
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I have a 2200kv motor with a 30 Amp ESC running on a 2200mah Lipo, which gets very quickly too hot. I thought it was something to do with the prop size / prop balance but having tried it without the prop and after just about 30 seconds the back end of the motor still gets quite hot, I´m a bit miffed as to what´s the deal is? is it a bareings or the ESC? perhaps the timing? what can it be? Grateful for any feedback thanks.
GrumpyBear did a great job answering your questions, but I have a little bit to add.

"Without the prop"
is the same as "without any cooling", it's no wonder it overheated.
At rated KV RPMs, your motor would have a short life. Motors are designed to have a load and be cooled, do not run a motor without a prop.

Is it the bearings?
If the shaft is not loose to the mount, and the bearings are free moving and quiet, they're fine.

or the ESC? perhaps the timing?
The ESC timing being advanced too fast, can cause the motor to over heat.

what can it be?
The causes I see most are;

    • Too much prop (back off on the length and/or the pitch),
    • or poor cooling for the motor.


Some more reading
Some ways to Managing the Heat.
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papabearflying
Thanks for your time and input LukeWarm all seems to be well now, I´ve put on a 6 x4 and dumped the 7 x 3 and all is good. Thanks.
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