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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 02-20-2014, 05:07 PM   #1
Flysfloats
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Default Motor Noise Help

Yesterday while flying my Fun Cub around I heard an awful "screeching" coming from the plane!! I thought it might be the collet/prop loose on the motor shaft so I cut the throttle and landed.

I checked things over and all is tight? I advanced the throttle slightly and got a short ratcheting of the prop and noise but when the throttle was increased things seemed normal.

The motor is an Exceed-RC 3010-1400kv but I don't think the problem is model specific. I took the prop off and advanced the throttle again, same result, momentary jerky movement and then smoothing out as a bit more throttle was advanced. When making the noise/movement and closing the throttle the shaft/motor almost seems to stop abruptly.

What do you suggest? I know I can change motors, I can just fly it and see what happens, or maybe take it out of the plane and disassemble and see if I can find anything??

Looking forward to your comments. FF
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Old 02-20-2014, 05:17 PM   #2
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Default unhooked or broken motor lead?

The first thing I would check is if one of the three leads to the motor is open, loose, or if the wire from the winding in the motor is broken. I had this happen in a motor after a bad landing and after I reconnected the wire the noise and chattering motor was okay. If you have plugs on the motor, you can disconnect one at a time to see if the winding has a fault. When you unhook the one that is broken nothing will change. Good luck, I hope it is something simple. Marty
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Old 02-20-2014, 06:14 PM   #3
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Default

Originally Posted by Flysfloats View Post
Yesterday while flying my Fun Cub around I heard an awful "screeching" coming from the plane!! I thought it might be the collet/prop loose on the motor shaft so I cut the throttle and landed.

I checked things over and all is tight? I advanced the throttle slightly and got a short ratcheting of the prop and noise but when the throttle was increased things seemed normal.

The motor is an Exceed-RC 3010-1400kv but I don't think the problem is model specific. I took the prop off and advanced the throttle again, same result, momentary jerky movement and then smoothing out as a bit more throttle was advanced. When making the noise/movement and closing the throttle the shaft/motor almost seems to stop abruptly.

What do you suggest? I know I can change motors, I can just fly it and see what happens, or maybe take it out of the plane and disassemble and see if I can find anything??

Looking forward to your comments. FF
Do you have access to another ESC to check out your ESC/motor? If your motor leads are accessible, all you need to do is hang the other ESC over the outside of the model, plug in a battery and receiver and give it a try.

We had a club member with the same exact thing a few weeks ago. His wiring was first class, it was fixed by replacing the ESC.

And, as indicated by Mivins, double check the integrity of your motor/ESC wiring.

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Old 02-20-2014, 08:15 PM   #4
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I expect something wrong at the connectors between motor and ESC. Could be one or more is loose. Could be you are starting to get arcing between connectors. Ensure they are seated firmly and wrap with electrical tape or heat shrink over them.

If that doesn't cure it then it might be the ESC or the motor .

Something is confusing the ESC's feedback sensing.
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Old 02-20-2014, 08:18 PM   #5
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Guys, thanks for the suggestions. I should be able to try all of them this afternoon. I am in rural southern Baja enjoying the winter down here. I have limited parts/replacement gear down here but should be able to get this figured out, especially with your help. If I find the problem I will report it. Again, Thank You, FF
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Old 02-20-2014, 09:55 PM   #6
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If its a new motor/escorting combo, check the timing of the esc. if not, it likely needs a solder job.

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Old 02-21-2014, 01:30 AM   #7
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Flysfloats......

I had this issue with an older (Banana Hobby Dynam Piper Cub)......it turned out to be an ESC going south (like you did for the winter...lol) .......Just replaced it with a new Turnigy, problem solved.

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Old 02-21-2014, 03:36 AM   #8
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I've had the same thing with a few different motors and ESCs...

Most cases it was a loose bullet connector. One it was the ESC (or maybe loose bullets blew the ESC...) and one it was the motor having windings shorted to each other.

Because it happened more than once caused by loose bullet connections (possibly arcing between phases) I now apply heat shrink tube, locking the bullets between motor and ESC. Never had it come up after doing that.

Cheapest solution first:
Check and lock the connections between ESC and motor with heat shrink tube or electrical tape.
Easy to check and prevent.
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