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概要:
極低S技術と表層窒化抑制技術の組み合わせにより鉄損を低減し，さらにSi,
Al低減により高磁束密度と高打ち抜き性を併せて達成した高効率モータ用電磁鋼板（NKB Core）を開発した。本稿ではNKB
Coreの材料設計思想について詳述し，電動パワーステアリングモータへの適用例について述べる。
Abstract:
A new type of non-oriented
electrical steel sheet was developed by ultra low sulfur
technology. In this material, the low core loss was obtained
by a reduction of the sulfur content in the steel and a
suppression of surface nitriding. And the high magnetic
flux density was obtained by a reduction of Si and Al contents.
This steel shows; (1) low hysteresis loss, (2) high magnetic
flux density, (3) excellent punching properties and (4)
low production cost. This paper describes the materials
design of NKB Core, and presents the application of this
material to an electric power steering motor.
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