Denso Corporation

Jeco Co., Ltd.

Norio Miyahara

Yukihiko Tanizawa

Takashige Saitou

Masahiro Aratani

Masato Ishihara

Seiichirou Ootake

Takeshi Tukamoto

A current sensing device and a manufacturing method of the same are disclosed. The current sensing device includes: a core having a gap; and a magnetic sensor inserted in the gap. The core includes a first core member and a second core member each made of a grain-oriented magnetic steel sheet having a magnetization easy axis. The first and second core members are stacked into a multiple layer structure so that a direction of the magnetization easy axis of the first core member and that of the second core member are perpendicular to each other. The first core member has a first trap part. The second core member has a second trap part.

Current sensing device and manufacturing method of the same

A current detection apparatus includes a magnetic core having a ring shape with a gap and a center opening portion through which a current path is disposed, and a magnetic sensor including a magnetic sensing element such as a Hall effect element arranged in the gap. When a current flows through the current path, the magnetic core generates magnetic flux therein so that magnetic field is generated in the gap. The magnetic sensor outputs different electrical signals, each of which is measured in a different measurement range and corresponds to intensity of the magnetic field in the gap. The current detection apparatus measures the current based on the electrical signals outputted from the magnetic sensor.

Current detection apparatus

A servo accelerometer includes a pendulum, a coil, a detection unit, and a servo unit. The detection unit has a photopotentiometer for receiving light passing through a slit of the pendulum and outputting a detection output on the basis of a change in resistance corresponding to a change in irradiation point. The servo unit has a displacement detection circuit for outputting a difference between a detection output from the photopotentiometer and a set value as a detection displacement amount.

Servo accelerometer

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Obu, Japan

Norio Miyahara