Kabushiki Kaisha Riken

Daisuke Ishihara

Koushi Hashimoto

Nozomu Kaimai

A split-type annular magnetic body for noise control, which has been difficult to produce with Fe-based nanocrystalline alloys, is provided and obtains an excellent noise reduction effect. The annular magnetic body for noise control includes thin strips of soft magnetic metal laminated along a radial direction and is used by having a cable inserted therethrough. The annular magnetic body for noise control includes a plurality of split pieces divided into a non-annular shape and is used by placing split surfaces of the split pieces in contact with each other to form an annular shape. The product FL×Hc of the flatness FL of the split surfaces and the coercivity Hc of the split pieces is 7.0 μm·A/m or less. The flatness FL is the sum of absolute values of the maximum value and the minimum value of a cross-sectional curve measured in accordance with JIS B 0601:2001.

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Tokyo, Japan

Daisuke Ishihara