Sumitomo Special Metals Co., Ltd.

Shigeru Yamaguchi

Makoto Kawakami

A DC current sensor has a detecting core with a plurality of detecting core members adapted to be divided in a circumferential direction for receiving the lead wire. A pair of annular exciting cores on one of said detecting core members formed of saturable magnetic material has a core intersection inter-connected perpendicularly to the circumferential direction of said detecting core members, and are disposed oppositely in spaced relation with said detecting core members to magnetically saturate a portion thereof by a magnetic flux produced substantially in the perpendicular direction against a magnetic flux in the circumferential direction, produced by the DC current flowing through said lead wire being detected, and to interrupt a magnetic path by the magnetic flux in the circumferential direction periodically. Exciting coils are wound around the exciting cores in negative-phase excitation.

DC current sensor

A DC current sensor with an exciting core of soft magnetic material and formed with a pair of tubular bodies, each tubular body being positioned in parallel with the other to provide therebetween a space, through which passes a wire conducting a current to be detected; a detecting core formed with the side faces of a pair of tubular bodies and two plate-like members of soft magnetic material, each of which connecting integrally with each of the inside edges thereof near an opening of the tubular bodies to form a rectangular frame-shaped member as a whole; exciting coils, each of which magnetically energizing the exciting core in the direction perpendicular to the plane of the detecting core; detecting coils, each of which being wound around the detecting core; and applying an alternating current to the exciting coils to periodically and magnetically saturate the rectangular-shaped portions of the detecting core and exciting core, energizing the exciting coils to modulate a magnetic flux produced in the detecting core corresponding to the DC current flowing through the wire.

A DC current sensor using a continuous annularly-shaped detecting core of soft magnetic material; a continuous annularly-shaped exciting core of soft magnetic material intersecting with the detecting core perpendicular to the plane thereof; respective detecting and exciting coils wound respectively around the detecting and the exciting cores; an AC excitation of a given frequency applied to the exciting coil to saturate the detecting core; a wire conducting DC current to be detected extending through the detecting core to establish a magnetic flux therein; and a detector connected to the detecting coil for detecting the magnetic flux modulated by the AC excitation to detect the DC current flowing in the wire.

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Osaka, Japan

Shigeru Yamaguchi