Electromagnetic steel plate having insulating coating and its manufacturing method, iron core of transformer using electromagnetic steel sheet, method for reducing dielectric loss of transformer and transformer

摘要

Problem to be solved: to provide an electromagnetic steel plate with an insulating coating which can reduce the dielectric loss of the transformer when used in the core of the transformer.An electromagnetic steel plate having an insulating film having at least one surface of an electromagnetic steel plate having an insulating coating having a dielectric constant of 15.0 or less and a dielectric tangent of 20.0 or less at 1000 Hz.