Small-size cores are stacked within the die tool by automatic interlocking. Large size or low series stacked afterwards by means of different technologies (Welding, Riveting, Bonding ...).

When talking about small motors, the current technology most of times manufactures the packages automatically within the cutting tool itself. This is what we call automatic packaging technology. In case a die is just a cutting die, after all, packaging must be done. Several technologies can be used for packaging that we explain as follows.


ESTAMODE has welding automatic centers to produce rotor & stator stacks by means of TIG/MIG/MAG Technology. Specific tools are used to ensure both the stator internal diameter and the slot alignment while the laminations are pressed and externally welded.

A stack manufactured by welding is stiffer than one produced by means of external staples or rivets. The sheet laminations are stamped with special slots in order to enhance the electrical welding arc. This technology is necessary on motors with diameters bigger than 150 mm due to the stack weight is too heavy to use automatic stacking on the progressive die tool.

This technology is applied on industrial, lifting, boat and train motors.


This technology is very useful in small parts with intensive production where the number of laminations on each stack is controlled automatically by the press PLC.

The Automatic Interlocking progressive die tools offers additional features:

Indexing consists of stacking laminations turned each other to get stack best balance value. Variations in strip thickness can produce perpendiculary/parallelism/total height deviations.
Indexing is an additional feature to be added on the die tool but it is recommended to anual volumes over 500.000 stacks and at least 1.000.000 equivalent strokes per year.

This technology is based on the same system than the previous one but the goal on the skewing process is getting a stack according to a requested skewness to avoid rotation blockings due to the electromagnetic fields.

If you need more information, get in contact with us.