EMG Solutions for Electric Strip

The insulation layer – quality makes all the difference

The rapid progress of climate change makes the need for an energy turnaround ever more pressing. As a logical consequence, the demand for electric motors, generators and transformers is constantly increasing. Electrical steel coated with insulating varnishes plays an important role in the production of these components, and with it the measurement of the respective insulating layer thickness.

Pigment-based coatings for electrical steel (lamination varnishes) have two main functions. Firstly, they provide the electrical insulation that is essential to prevent leakage currents or short circuits between different layers of transformer laminations. This ensures the safe and efficient operation of electrical equipment. Secondly, these varnishes form a protective layer on the surface of the electrical steel that prevents corrosion and rusting. This is important for electrical sheets that are frequently used in corrosive environments.

In addition, there is also the function of full-surface bonding of lamellae with so-called stoving enamels. In this process, an incompletely cured varnish is applied to the surface of the electrical steel, which is then cured at high temperatures to create a permanent bond between the various lamellae. 

Our solution, EMG SOLID® DFT (Dry Film Thickness), uses laser-induced fluorescence spectroscopy to measure the surface weight of transparent and lightly pigmented varnish layers on electrical steel and then visualises this over the entire length and width of the strip.