This sounds like a bearing going out to me. Possibly within the sk3? I got these motors from @Chibatterysystems less than a year ago, it seems weird that it would be having issues already. I never ride in the rain or anything like that and due to the state of my batteries, these motors don’t see high amps very often either.
I finally got around to replacing my wheel bearings, the ones in the wheels now are brand new and perfectly silent. The noise is not around when in low rpm-ranges, but present when slowing down from higher rpm-ranges. Should I be concerned about this? It hasn’t seemed to affect my riding yet.
I suppose I could try that but it’s a little bit involved, I have to take my enclosure apart and stuff lol
Let me take a video with the other motor unplugged and the belt off to see if I can isolate it a little bit more.
Not that you are necessarily wrong @Chibatterysystems but I have been running these motor settings for probably 6 months now (several hundred miles), and I have the good 'ol FOCBOX’s so I don’t expect that is the issue but it is theorhetically possible.
Here’s another video for you guys to look at. Seems the noise is even more pronouced with the belt off. The pulley is quite tiight on the motor so I don’t think that is the perpertrator
If it comes to it I can open it up. Again pretty involved compared to if someone else had a similar issue with their bearing - then at least I can still ride it until I got another bearing and had to open it all up.
No weird noise at lowrpm, but the windings appear by inspection to be perfectly fine - like there’s nothing that would seem to be touching the can at higher rpm
Like you said huge holes, I don’t see anything inside
The bearings in those motors are pretty small n with the leverage of the tight belt maybe u got a lot out of them. I wasn’t thinking the windings being a problem but metal muck in the air gap stuck to magnets. Or bearings are beat. Maybe u can creep some thin oil in and see the sound then. Maybe they have three bearings
Blast with air compressor sometimes cleans it
Another possibility is they’re likely slide fit bearings and maybe the bearing housing or shaft have developed more play from wear and at some frequency or speed and centrifugal force it vibrates. Could glue bearings in w retaining fluid.
Saw a cool way to balance a motor by taping a laser to the hanger. Spin the motor and look at the dot on ur wall and add bits of putty/glue till the dot stays put. If balanced be easier on bearings and shaft n housings