Single-layer chain, concentric, single-layer cross, double-layer and double-layer concentric.

Matters needing attention when repairing the motor offline:

1, try to be smooth when logging off, don't mess up the coil, just screw it in the slot.

2. Just be careful not to break the enameled wire when you go offline.

3. Pay special attention not to make the insulating paper of the notch too short, and don't use a spatula to cut it.