I haven't completed the assembly of my quad but I noticed one of the motors was not spinning as freely as the other 3. It seems like the top spinning part is scraping against the bottom fixed plate and making a quiet scratchy noise. I haven't used the motors that much yet and I noticed this from just spinning the motor from my fingers.

  • $\begingroup$ Have you had any crashes or been flying in a dusty/muddy environment? $\endgroup$ Aug 5 '21 at 20:45
  • $\begingroup$ nope. haven't flew it besides just running the motor off the radio transmitter and reciever and my area doesn't get very dusty $\endgroup$ Aug 6 '21 at 1:37
  • $\begingroup$ okay - and did it do this before you soldered it to the ESC? $\endgroup$ Aug 6 '21 at 1:40
  • $\begingroup$ the motors came in a kit with the ESCs with bullet connectors so there was no soldering needed $\endgroup$ Aug 6 '21 at 7:23
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    $\begingroup$ okay, thank you for checking that. The reason I needed to know is because if the motor is shorted, it gives extra resistance to turning. Assuming you have done a visual inspection and have checked the mounting bolts screws aren’t touching the windings, my next step would be to disassemble the motor and check everything look also alright internally. Only do this if you are confident you know what you’re doing, though $\endgroup$ Aug 6 '21 at 14:46

If the quad already had some flight time, I would guess it was a burned esc, but in your case maybe your screws are too long or there is something stuck inside the motor.

  • $\begingroup$ how can the ESC be burned? during high current bursts when flying the drone? but i did take the screws off and same behaviour with the motor. i'll take the motor apart to look inside $\endgroup$ Aug 5 '21 at 19:34
  • $\begingroup$ Yes, that could be the reason or what happened to me when I had that issue was I got grass stuck on my motor when taking off. $\endgroup$
    – Vichot
    Aug 5 '21 at 21:10
  • $\begingroup$ hmm okay. well i can't take apart the motor because i don't have that skinny of a screwdriver. i'll see what i can do $\endgroup$ Aug 6 '21 at 1:35

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