Super interesting to disassemble a brushless outrunner - never pulled one of these apart.
One snap ring + one wave washer, quick pull, easy peasy (thanks @b264 for the guide)
Great coverage across the sensor pcb
I always wondered if the FS-BH motors had the possibility for mounting screws going too deep and shorting on the windings. I tried - it seems like the mounting holes aren’t fully threaded. The fasteners stop right at the edge.
Good epoxy/adhesive on the sensor wires too
Dual bearings top and bottom on the stator, looked in good shape.
For those who may need replacements - NMB R-2210KK made in Thailand.
Confirmed again - no grub screw on the bottom. It’s a bunch of the battle hardening glue packed in the hole. Probably used during assembly somehow.
The reason I tore this one apart is that I have had a high pitched ‘cricket chirp’ sound coming from this motor. I noticed the bell taps the stator at one point, just barely, in every revolution.
I confirmed this - there’s a very slight amount of wiggle to the axle. The bottom of the axle has a hole, which at first glance appears to be a hex head. I tried every allen key I have - metric and imperial - no dice. Upon closer inspection, it is not a hex. It’s a round hole with a lead-in chamfer. My guess is that it’s used to press-fit the axle in place during assembly.
So… now what?! I could try to press the axle out with a hydraulic press, but I’m not sure how I would even fix this. Or how I would line everything up correctly to epoxy it in place.
Orrr I can just take the bell to a belt sander and grind off 2mm and live with it… it works perfect otherwise.
Anyone want to throw an opinion in here?
@Fosterqc you ever get around to swapping shafts?