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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 28
SUMMARY:Quantitative measurement of insulating coatings on electrical sheet with EMG SOLID® systems
DESCRIPTION:Electrical sheets - along with magnets and lacquered copper wires - are key components for the manufacturing of electric drives. The projected growth of e-mobility will increase the demand for electrical sheets for the automotive industry from 100 thousand tonnes in 2018 to about 1.2 million tonnes in 2030. Quality assurance and the control of quality costs for electrical sheets thus determine the profitability of motor manufacturers to a large extent. The thickness and homogeneity of the insulating coating play a special role here.
Beta transmission, used until now to determine mass per unit area, thickness, and density, will soon reach the limit of its availability. Different isotopes (krypton, strontium, promethium) are used for different weight ranges, but Promethium can only be purchased for the next 1 - 2 years.
The EMG SOLID® systems, so far used for the quantitative determination of lubricant layers on sheet metal, offer an ideal replacement. Especially laser-induced fluorescence (LIF) can be used to reliably determine the desired measuring data online. The system parameters, e.g., laser excitation and observation wavelength of the fluorescence, detector sensitivity or signal timing are specifically adjusted to guarantee an optimal system adaptation to the respective type of coating.
An additional reference measurement on uncoated sheet surfaces, e.g., by a suitable backscatter method, represents a further possibility for optimising this application. Coating thicknesses between 0 - 7 µm (incl. dark pigmented coatings) could be successfully determined. The methods are designed for inline or online measurement operation, also in traversing mode with typical travel speeds of up to 1 m/s.
The EMG results clearly show that quantitative detection of insulating varnishes on electrical sheet in the micrometre layer thickness range is reliable possible.
This paper describes the technological background of the method and shows laboratory as well as first application results.

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DTSTART:20230614T102000
DTEND:20230614T104000
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