I have detected intermittent differences in the feeling and sound when hand turning the motors after about 8 months of use. There are no known flight problems but I am wondering how much magnetic "clicking" (not a clicking sound but a feeling of resistance from the internal magnets) one should feel when hand turning the Inspire 2
motors. I recently bought a second Inspire 2
and the motors turn very smoothly by hand compared to the older aircraft. Did DJI change the motor design? Is the magnetic "click" feeling normal, and does it change over time as the motors age with use?
Also me, have noticed what you describe, but not on my Inspire 2
motors which are all perfect and regular to date, but on other larger brushless motors.
I have many of various brands to mount on various larger frames.
I had the adventure of owning and testing 4014-330KV AVIZAR motors, which boast ceramic bearings, for an SkyHero Spyder 850 X8.
Terrible experience, mine units are/was badly made.
Received about 20 pcs (already installed and others new unassembled) and almost all of them had an abnormal, rough, absolutely not smooth behavior rotating them with fingers, just the opposite of what AVIZAR website boasts: "You can feel the difference just by turning them, and hear the difference on the run!"
Emailed to AVIZAR describing the facts and in the end I obtained the replacement of the motors through the official European seller and drone assembler, eRCMARKET who had mounted the octocopter for me, without noticing the problem, or rather, I say, their engineer had ignored, had pretended to not notice it!
After my complaint and shipping back four of the worst motors I had received, 2 units dismantled from the drone and 2 I had purchased from an UK Ebay seller, the customer manager of eRCMARKET had simply replayed me there was a batch of defective motors which was then retired from the market.
Too bad that among these defective motors there were also those mounted by their clever engineer on my octocopter!
I have received the full replacement of all the AVIZAR motors (without sending back all the motors I still have) with 4014-330KV by T-Motor.
Short additional note:
AVIZAR staff complained these T-Motors are the copy of their motors, having the same specs and they have removed these specs from their site, as disperated pointless protection...
At the end, still to me is not clear, noone said this to me, what generate these anomalies, these big different behaviors, so the necessary forces you notice to rotate some motors, but I don't like and suppose there are out of tolerances, if new, or mechanical wear, when this happens after use.
Maybe different power of the magnets, as well as ball bearing tollerances could be the heart of this issue.
Very small, or small variance can, or cannot be aceppted.