Mitsui High-Tec, Inc. and Nippon Steel Corp. have jointly established technology to automatically store motor cores made of extra-thin electromagnetic steel sheets into metal molds, by which the motor output is increased by 30-50%. The electromagnetic steel plate is the generic name of silicon steel plates, low carbon content steel plates and pure-iron steel plates featuring excellent properties such as low iron loss, concentrated magnetic flux density and a high magnetic permeability. In general, silicon steel plates containing 2-3% of silicon are used for producing the iron cores of motors, but to minimize the eddy current loss generated in these steel plates, the common practice is to roll these steel plates thinly and to punch out these sheets one by one for use in a lamination. The newly developed motor core is 25% thinner than the conventional type of thinnest core, and not only reduces the power consumption rate but also enables motors to be produced more compact and lightweight.
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