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Author Topic: Motor getting warm, electrical smell (new build)  (Read 240 times)

Offline jamie16v

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Motor getting warm, electrical smell (new build)
« on: June 08, 2018, 21:45:16 »
Hello guys, I have just finished building my chameleon. I am using a kakute f4 aio, tekko32 esc and emax rs2205 motors.

When I went to test my motors in betaflight (props off) I could smell a slight electrical burning but no smoke. Everything else seemed fine and all motors spin as they should, though I have noticed that motor 3 is getting warm compared to the rest.
Should I be concerned?

Offline ched999uk

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Re: Motor getting warm, electrical smell (new build)
« Reply #1 on: June 08, 2018, 21:56:19 »
Sounds like you could have the motor bolts hitting the windings causing a short! Use a multimeter to test for continuity between frame and motor wires.
Alternatively back off motor bolts and see if temp comes down.

Offline jamie16v

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Re: Motor getting warm, electrical smell (new build)
« Reply #2 on: June 08, 2018, 22:06:12 »
Tbh, I used the shortest bolts provided.  I am almost certain that they are not into the motor enough to reach the windings but I will check.
Cheers

Offline jamie16v

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Re: Motor getting warm, electrical smell (new build)
« Reply #3 on: June 08, 2018, 22:10:39 »
Hmmm, it does short with the frame......

Offline atomiclama

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Re: Motor getting warm, electrical smell (new build)
« Reply #4 on: June 08, 2018, 22:11:26 »
Should I be concerned?

Ys run for your life, they are going to explode.
Wasdale X, Ow that hurt

Offline Cheredanine

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Re: Motor getting warm, electrical smell (new build)
« Reply #5 on: June 08, 2018, 22:16:17 »
Hmmm, it does short with the frame......
As per chad, check your motor screws, screws shoring the windings are likely to make the motor stutter at low rpm too

Offline jamie16v

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Re: Motor getting warm, electrical smell (new build)
« Reply #6 on: June 08, 2018, 22:25:18 »
Ok, The bolts are not fouling the windings, they are too short for that, I think it may be a faulty motor perhaps?. I think the windings are touching the base of the motor.
Just checked with the multi meter and all wires short with the housing.

Offline ched999uk

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Re: Motor getting warm, electrical smell (new build)
« Reply #7 on: June 08, 2018, 22:50:50 »
Ok, The bolts are not fouling the windings, they are too short for that, I think it may be a faulty motor perhaps?. I think the windings are touching the base of the motor.
Just checked with the multi meter and all wires short with the housing.
The motor wires are coated with a sort of varnish. So if the motor wires have a conductive path to the motor housing something is not good. Quite often motor fixing bolts can hit the windings and cut through the coating thus creating a conductive path to the carbon fibre (conductive) frame.
It could be that there was a fault in the motor windings that caused them to overheat and burn the coating off!!! That could cause the shorting you have.

What ever the cause I suspect the motor may be damaged. If you have removed the bolts and when tested (PROPS OFF) it still gets hot and the others don't then I think the motor may need to be replaced.

Offline jamie16v

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Re: Motor getting warm, electrical smell (new build)
« Reply #8 on: June 08, 2018, 23:09:55 »
Yeah, well they`re brand new motors, only fitted today. I have just contacted banggood for a replacement.
Let`s see how that goes  :laugh:

Offline Cheredanine

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Re: Motor getting warm, electrical smell (new build)
« Reply #9 on: June 08, 2018, 23:11:31 »
The other thing I have noticed with recent open bottom motors is as you tighten them down to the arm the wires exiting the motor are forced upwards, in some cases they and up touching the bell (because there is no bottom to prevent this)this is turn can lead the bell to a raiding the insulation
However just a point to note, not relevant here
Agree you need to swap that motor out

Offline jamie16v

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Re: Motor getting warm, electrical smell (new build)
« Reply #10 on: June 08, 2018, 23:18:20 »
Gutted actually, was hoping to maiden it this weekend :( I think I'll try to source one locally.

Offline Cheredanine

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Re: Motor getting warm, electrical smell (new build)
« Reply #11 on: June 08, 2018, 23:43:40 »
Hobbyrc stocks as does quadcopters.co.uk