There's no perfect system so this was bound to happen. After several years of ordering dozens of motors from Hobbypartz, a bad one finally arrrived. This motor never made it to the maiden flight. Always bench check the motor prior to installing it on the plane. From now on, I will buy only motors with soft flexible silicon wires and with more protection at the bottom of the bell. The broken wire probably occurred when the person who wound the motor checked his job by flexing it several times.
https://www.youtube.com/watch?v=QR_hG6AoVhE (https://www.youtube.com/watch?v=QR_hG6AoVhE)
To fix this you could solder the wire with a little solder and test if it works, then put some epoxy at the point where wires come out of stator.
If that doesnt work then rewinding is only option. For me it has worked with small motors, i dont know if the efficiency will be as good as before. I never quite understood how such thin wires carried such a high current while external wires needed to be thick.
Thanks for the ideas. I've yet to try rewinding so this now becomes a learning project.
Though one would expect better quality control from such a well know hobby shop, things like this will happen. They might replace it if returned too but it becomes costly sending it back.
Heres how i fixed mine, sorry you cant see the solder joint as its coated with epoxy.
Is it working normally ?
Yes now it is working without problems, but the wires are thin and break if wiggled too much, so putting epoxy on such motors is necessary. Even with the epoxy a bad crash could break the wire.
This motor after breaking wire and soldering it is giving 8-9 min of runtime on full throttle with a 2s 500mah lipo and 7035 prop. Thrust enough to pull a 150gm+ plane.