Generally speaking, the winding of large and medium-sized motors adopts shaped coils, and its insulation strength is better than that of scattered coils.
Usually, the pedestal whose height is less than 3 15mm mostly adopts scattered coil, because the diameter and length of its wire core are relatively small and the internal space is relatively narrow. The use of loose coil is beneficial to the end shaping after wire embedding, but its slot fullness is relatively low, so the loss is relatively high and the power is also low (because the current density is the same, the cross-sectional area is small and the current is also small).
On the premise that each wire is insulated, the formed coil will be pasted with one or more layers of insulation after winding, and the size is not easy to change after being formed by a forming machine (or by thermoforming and curing the coil with an insulating tape containing glue).
Bulk winding coils are more suitable for mass production, and the daily output of molded coils will be less affected by molding machinery (or molding machinery).
Literally and practically, the winding coil is made of enameled round copper wire by hand through the winding mold, and the winding coil is made by fixing (or basically fixing) the length, span and elevation of the coil with the molding mold. Some formed coils can be broken because of their small cross-sectional area, but the span and elevation after breaking will not meet the requirements of the drawings. Loosening the coil is to limit the circumference of the coil, and adjust the pitch and elevation according to the drawings during the embedding process.