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公开(公告)号：US20150204916A1
公开(公告)日：2015-07-23
申请号：US14600784
申请日：2015-01-20
Applicant: Hitachi Metals, Ltd.
Inventor： Katsuya AKIMOTO , Hisashi TATE , Naoki FUTAKUCHI , Naofumi CHIWATA , Ken OKUYAMA , Yukio IKEDA , Kazuhisa TAKAHASHI
CPC classification number: G01R19/0092 , G01R15/205 , G01R15/207 , G01R19/25 , G01R33/093
Abstract: An electric current sensor includes a plurality of bus bars arranged in parallel, a plurality of magnetic detection elements that are adapted to detect a strength of a magnetic field generated by an electric current flowing through the bus bars and to output a voltage according to the strength of the magnetic field detected, and an arithmetic operation part to arithmetically operate an electric current flowing through the bus bars based on the voltage output from the plurality of magnetic detection elements. The arithmetic operation part includes a magnetic flux density arithmetic operation part to arithmetically operate a magnetic flux density based on the voltage, and an electric current arithmetic operation part to arithmetically operate an electric current I1 to Im flowing through each of the bus bars based on formula (1) below, ( B 1 = a 11 · I 1 + a 12 · I 2 + … + a 1 n · I n B 2 = a 21 · I 1 + a 22 · I 2 + … + a 2 n · I n B 3 = a 31 · I 1 + a 32 · I 2 + … + a 3 n · I n ⋮ ⋮ B m = a m 1 · I 1 + a m 2 · I 2 + … + a mn · I n where a 11 to a mn are coefficients , ( 1 ) B1 to Bm are a magnetic flux density and I1 to Im are an electric current.
Abstract translation: 电流传感器包括并排布置的多个母线，多个磁检测元件，其适于检测由流过母线的电流产生的磁场的强度，并根据强度输出电压 以及算术运算部件，其基于从多个磁检测元件输出的电压算术运算流经母线的电流。 算术运算部包括基于电压算术运算磁通密度的磁通密度算术运算部，以及电流运算部，根据公式计算流过各母线的电流I1〜Im （1）（B 1 = a 11·I 1 + a 12·I 2 + ... + a 1）n·I n B 2 = a 21·I 1 + a 22·I 2 + ... + a 2 n n I n B 3 = a 31·I 1 + a 32·I 2 + ... + a 3 n n I n⋮⋮⋮⋮⋮⋮⋮⋮⋮⋮⋮1 1 1 1 1 1 1 1 I I I I I I （1）B1到Bm是磁通密度，I1到Im是电流。
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公开(公告)号：US20190250193A1
公开(公告)日：2019-08-15
申请号：US16210549
申请日：2018-12-05
Applicant: Hitachi Metals, Ltd.
Inventor： Naoki FUTAKUCHI , Ken OKUYAMA , Katsuya AKIMOTO , Haruyasu KOMANO , Jun UMETSU , Yujiro TOMITA
Abstract: A current sensor includes plural bus bars which are each formed rectangular in a cross section, a pair of shield plates that include a magnetic material and are arranged so as to collectively sandwich the plural bus bars therebetween, and plural magnetic detection elements that are each arranged between the bus bars and one of the shield plates. A distance d between a detection position of a magnetic field intensity at an arbitrary one of the magnetic detection elements and a center position in the width direction between one of the bus bars corresponding to the arbitrary magnetic detection element and an other of the bus bars adjacent thereto in the width direction satisfies the following expression: d/w+0.023(w/h)≥0.36 where a width of the shield plates is w and an interval along a height direction of the shield plates is h.
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公开(公告)号：US20190187183A1
公开(公告)日：2019-06-20
申请号：US16157257
申请日：2018-10-11
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Katsuya AKIMOTO , Naoki FUTAKUCHI , Haruyasu KOMANO , Jun UMETSU , Yujiro TOMITA
CPC classification number: G01R15/148 , G01R19/0092
Abstract: A current sensor includes three bus bars arranged in such a manner to be spaced and aligned in a width direction thereof. A first shield plate and a second shield plate, which are made of a magnetic material, are arranged in such a manner to sandwich the three bus bars therebetween together in a thickness direction perpendicular to the width direction. Three magnetic detection elements are arranged between the three bus bars respectively and the first shield plate to detect a magnetic field strength generated by currents flowing through the corresponding bus bars. A conductive plate is disposed between each of the magnetic detection elements and the first shield plate. The conductive plate is disposed in such a manner to sandwich the three bus bars together between the conductive plate and the second shield plate. The conductive plate is made of a nonmagnetic conductive material.
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公开(公告)号：US20170285076A1
公开(公告)日：2017-10-05
申请号：US15471914
申请日：2017-03-28
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Katsuya AKIMOTO , Naoki FUTAKUCHI , Yujiro TOMITA
CPC classification number: G01R15/205 , G01R33/025 , G01R33/093
Abstract: A current sensor includes a busbar carrying an electric current to be measured, a magnetic sensing element for detecting intensity of a magnetic field generated by the current flowing through the busbar, and a pair of shield plates that include magnetic materials and are arranged to sandwich the busbar in a thickness direction of the busbar. The shield plates include a conductive shield plate including a conductive magnetic material and a non-conductive shield plate including a non-conductive magnetic material. The conductive shield plate includes a slit penetrating therethrough. The magnetic sensing element is arranged at a position where the magnetic sensing element overlaps the slits in the thickness direction and does not overlap the conductive shield plate in the thickness direction.
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公开(公告)号：US20200256895A1
公开(公告)日：2020-08-13
申请号：US16783887
申请日：2020-02-06
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Akitoshi Fujimori , Naoki Futakuchi , Yujiro Tomita , Jun Umetsu
Abstract: An electric current sensor includes bus bars each having a plate shape through which an electric current to be detected flows in a length direction, a housing including a bus bar-holding portion for holding the bus bars with being aligned in a width direction perpendicular to the length direction and a thickness direction of the bus bars, magnetic detection elements, each of which detects a strength of magnetic field generated by the electric current flowing through a corresponding bus bar, and a first shield plate and a second shield plate arranged to sandwich the respective bus bars and the magnetic detection elements in the thickness direction. Each of the first shield plate and the second shield plate is made of a magnetic material. Both the first shield plate and the second shield plate are held directly and commonly by the housing.
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Patent Agency Ranking
公开(公告)号：US20200182912A1
公开(公告)日：2020-06-11
申请号：US16702202
申请日：2019-12-03
Applicant: Hitachi Metals, Ltd.
Inventor： Naoki FUTAKUCHI , Ken OKUYAMA , Akitoshi FUJIMORI
Abstract: An electric current sensor includes first, second, and third current sensor modules, each including at least one bus bar formed in a rectangular shape extending in a width direction in cross section, to carry an electric current along a length direction perpendicular to the width direction, one pair of shield plates made of a magnetic material and disposed in a height direction perpendicular to the width direction and the length direction in such a manner as to sandwich the at least one bus bar therebetween, and at least one magnetic detection element disposed between the at least one bus bar and one of the one pair of shield plates, to detect a strength of a magnetic field in the width direction. The first, the second, and the third current sensor modules are arranged by superposition on top of each other in the height direction.
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公开(公告)号：US20190170794A1
公开(公告)日：2019-06-06
申请号：US16156033
申请日：2018-10-10
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Naoki FUTAKUCHI , Haruyasu KOMANO , Jun UMETSU , Yujiro TOMITA
IPC: G01R15/20
Abstract: A current sensor includes two bus bars, each of which is formed in a plate shape, the two bus bars being aligned and arranged so as to be spaced apart from each other in a plate width direction thereof, and magnetic detection element arranged opposite the two bus bars, respectively, in a plate thickness direction of the bus bars to detect a magnetic field strength generated by a current flowing through the corresponding bus bars. The magnetic detection element are gradient detection type magnetic detection elements that output a difference between magnetic field strengths detected at two magnetic sensing positions, respectively, and are arranged in such a manner that a detection axis direction thereof is perpendicular to a length direction of the bus bars and is tilted with respect to the plate thickness direction.
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公开(公告)号：US20170370969A1
公开(公告)日：2017-12-28
申请号：US15634394
申请日：2017-06-27
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Katsuya Akimoto , Naoki Futakuchi , Jun Umetsu , Yujiro Tomita
CPC classification number: G01R15/205 , G01R33/093
Abstract: A current sensor includes, a bus bar through which a current flows, a magnetic detection element detecting a magnetic field intensity generated by the current, first and second shielding plates arranged so as to sandwich the bus bar between the first and second shielding plates, a first conductive plate made of a conductive nonmagnetic material, arranged between the bus bar and the first shielding plate, and a second conductive plate made of the conductive nonmagnetic material, arranged between the bus bar and the second shielding plate, wherein the magnetic detection element is arranged at a first conductive plate-side. A distance between the first conductive plate and the bus bar is longer than a distance between the second conductive plate and the bus bar. The first conductive plate includes a slit formed in the first conductive plate at an overlapping position, and the slit pierces the first conductive plate.
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公开(公告)号：US20170315157A1
公开(公告)日：2017-11-02
申请号：US15517676
申请日：2014-10-10
Applicant: Hitachi Metals, Ltd.
Inventor： Masaki NOGUCHI , Naoki FUTAKUCHI , Ken OKUYAMA
IPC: G01R15/20
Abstract: An electric current detection device includes magnetism detector elements for detecting a strength of a magnetic field generated by an electric current flowing through an electric current path, a detection circuit for detecting a magnitude of an electric current flowing through the electric current path based on an output of the magnetism detector elements, and plural wires that are connected to the magnetism detector elements and extend in a direction away from the electric current path. The magnetism detector elements are arranged such that a direction of a magneto-sensitive axis thereof lies on a first plane parallel to a current-carrying direction of the electric current path and parallel to an extending direction of the plurality of wires. The plural wires are arranged on a same plane of a second plane orthogonal to the first plane.
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公开(公告)号：US20220228935A1
公开(公告)日：2022-07-21
申请号：US17561843
申请日：2021-12-24
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Teruyuki NAKAMURA , Naoki FUTAKUCHI
IPC: G01L3/10
Abstract: A torque sensor to detect torque transmitted by a shaft having magnetostrictive properties is provided with a pair of cylindrical detection units arranged around the shaft and aligned side-by-side in an axial direction of the shaft, and first and second connection lines connecting the pair of detection units. Each detection unit includes first to fourth detection coils stacked in a radial direction. A series circuit formed by series connecting the first and fourth detection coils is parallel connected to a series circuit formed by series connecting the second and third detection coils. The first and second connection lines are configured to connect between corresponding connecting portions of the first and fourth detection coils and between corresponding connecting portions of the second and third detections coils, respectively. The torque transmitted by the shaft is detected based on a potential difference between the first connection line and the second connection line.
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