By checking a sample stator pack, it is possible to detect an increase in iron leaks due to the different processing stages, which are essentially:

• Leaks due to shearing as a result of the breaking of the crystalline system that makes up the sheet
• Leaks due to short-circuit among metal sheets due to the burr generated by cutting, especially due to reduced sharpening of the dies
• Leaks caused by a variety of packing systems, such as: stapling, riveting, nailing, welding, buttoning, etc.
• Reduced surface insulation of the metal sheets, with a consequent increase in inter-lamellar eddy currents
• Control of the effectiveness of the heat processing of the package, to facilitate the orientation of the crystals and to improve inter-lamellar insulation

It is possible to detect both iron leaks in watts of the entire stator pack at different induction values, and to display the hysteresis curve to evaluate the degree of saturation of the pack.

By means of a data acquisition and digitization system, the system software also provides a graphical representation of both the induced voltage and magnetizing current values and, after the subsequent mathematical integration processing on the waveform of the induced voltage, of the graphical representation of the magnetization curve or magnetic hysteresis. In this way, a useful tool is provided to evaluate the degree of magnetic saturation of the core and, at the same time, to have a visual quantification of the leaks resulting from magnetic hysteresis.