IEC 60740-1:2005 specifies the characteristics of laminations. Their preferred use is cores for transformers and inductors. The laminations are made of sheets and strips of magnetic materials, specified in IEC 60404-8-4 and IEC 60404-8-7. The main changes are listed below:a) ranges with lamination strips YS, YSUI 1, YSUI 2 and laminations YEE 2-..L added;b) range YEI 1 extended at the above end;c) ranges YED 2, YEF 2, YEL 2, YES 2, Type YM 1-5a and YM 1-7a cancelled;d) national designations cancelled;e) electrical characteristics for the laminations specified;f) mechanical characteristics for laminations added;g) holes added for lamination types YEI 1, YUI 1, YUI 2, YM 1;h) in Annex A, a conversion of the polarisation J and the field strength H in a specific total apparent power is defined. For the characteristics of the reactive power and the power loss, equations and constants are specified.
Specifies the preferred sizes, and their associated tolerances, of lamination of various shapes made from magnetic sheets or alloys of specified composition and thicknesses, their marking and packing, and also simple test methods for determining the electrical properties of cores made from such laminations. The principal application for laminations complying with this specification is for transformers and inductors used in telecommunications and electronic equipment employing similar techniques.
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