TwisterGripper
100 mW
Follow up to my post the other day QS205 metallic noise between 66-69kph freewheeling.
Ok so I opened up the motor - pulled both side covers.
No signs of severe heat damage - no burnt or discolored wires/coils
- both bearings spin smooth, very little play, well greased. No noise.
- Inspected magnets: pried a little on each magnet with a pointy pick - all glued in tight. No scrapes on magnets, no breaks/cracks, no signs of any foreign object scraping on stator or magnets.
- covers flat, no signs of warping.
Pulled brake side cover: found a tiny bit of corrosion or burn marks on the blue wire cluster where they all combine to exit the motor but I cannot see that being a problem, as all those wires connect together anyways.
- resistance: apprx 2.5 ohms between each of 3 phase connectors - all about the same
- since motor seems to pull with full strength - can only assume no shorts.
Did I miss anything else that should be checked?
Im stumped. maybe the noise is just a perfectly normal resonance of some sort and the problem is elsewhere...
Ok so I opened up the motor - pulled both side covers.
No signs of severe heat damage - no burnt or discolored wires/coils
- both bearings spin smooth, very little play, well greased. No noise.
- Inspected magnets: pried a little on each magnet with a pointy pick - all glued in tight. No scrapes on magnets, no breaks/cracks, no signs of any foreign object scraping on stator or magnets.
- covers flat, no signs of warping.
Pulled brake side cover: found a tiny bit of corrosion or burn marks on the blue wire cluster where they all combine to exit the motor but I cannot see that being a problem, as all those wires connect together anyways.
- resistance: apprx 2.5 ohms between each of 3 phase connectors - all about the same
- since motor seems to pull with full strength - can only assume no shorts.
Did I miss anything else that should be checked?
Im stumped. maybe the noise is just a perfectly normal resonance of some sort and the problem is elsewhere...
