MANUFACTURE OF LOW IRON LOSS UNIDIRECTIONAL ELECTROMAGNETIC STEEL PLATE

• Main Authors: NOZAWA TADAO, KOBAYASHI TAKASHI, MATSUO MASAO, YABUMOTO MASAO
• Format: Patent
• Language: English
• Published: 06.08.1987
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

PURPOSE:To obtain the titled electromagnetic steel plate of high space factor and low iron loss by a method wherein a groove part is formed on the surface of the steel plate by performing a photoetching treatment. CONSTITUTION:A groove part is formed on the surface of a steel plate by performing a photoetching treatment, and then a unidirectional steel plate having both low deterioration in space factor on the end-product and the exceedingly excellent value of iron loss, is formed by performing the commonly used process. The reason why the iron loss value is improved by providing the groove is considered that it is due to the formation of a distorted field by the magnetic effect and a local concentration of stress generated by the geometrical shape of the groove. The improvement in space factor is achieved by non-generation at all of deformation and burr on the surface of the steel plate as a result of removal of the base by etching using a chemical method.