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burning up motors and esc's

Old 03-05-2016, 06:38 PM
  #1  
bignuggets
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Default burning up motors and esc's

I recently replaced a brushless motor and ESC in a rebuilt plane laying around. The motor is a Gforce 400 and a Castle 30 amp ESC. I used the recommended prop 10 x4.7 slow fly. I ran it stationary for about 1 minute when the ESC caught fire and the motor fried itself. I replaced the ESC with a generic and replaced the motor with a similar 400 size motor. Used a 9 x 5 prop slow fly. Ran the setup again. This time it lasted about 2 minutes at which time I shut down. The ESC was very HOT and the motor would burn your finger if touched. I let everything cool down and dropped the prop size to an APC 7 x 6E. The ESC got quite warm and the motor got hot but not to the point of getting burned. I can only surmise that the bigger props were too much of a strain, even though that was the appropriate setup from the manufacturer. Any thoughts?
Old 03-06-2016, 08:34 AM
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blvdbuzzard
 
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You listed the motor, ESC but what battery? 2s, 3s, 4s, 5s, 6s? If the listed prop was for a 2s battery and you plugged in a 3s battery you would and could melt it. Do you have a watt meter? I think you should get one, it will help you to not let the magic smoke out.

http://www.valuehobby.com/accessorie...wattmeter.html


Buzz.
Old 03-06-2016, 09:31 AM
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bignuggets
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Let me clarify a few things. I was running a Turnigy D2826-6 2200kv Outrunner Motor with a 30 amp ESC. on a 3s. I even hooked a 50 amp ESC. The motor still got hot but the ESC remained cool to the touch.
Old 03-06-2016, 07:05 PM
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blvdbuzzard
 
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Here is an online calc tool. It will give you an idea of what your motor can handle.

http://ecalc.ch/motorcalc.php

From your link, it says this"
[h=3]Suggested Prop: 7x4(2S) ~ 5x5 (3S) "[/h]
So if you are using a 10 inch or 9 inch prop you are way over propping it. Max current is 34 amps.

From one of the comments

"Tony, this motor can easily take 6*4 prop on 3 cell. Anything less than that size prop is perfectly fine. With 6*4, it gets warm on continuous throttle." They are using a 6x4 prop, you are using a 9x5 and 7x6 prop. To much prop.


Buzz.

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