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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：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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Patent Agency Ranking
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：US20200018804A1
公开(公告)日：2020-01-16
申请号：US16457099
申请日：2019-06-28
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Naoki FUTAKUCHI , Yujiro TOMITA
Abstract: An electric current sensor includes a plate-like shape bus bar, through which an electric current to be detected is to be passed, one pair of shield plates, which are made of a magnetic material and disposed in such a manner as to sandwich the bus bar between the one pair of the shield plates in a thickness direction of the bus bar, a magnetic detection element, which is disposed between the bus bar and one of the shield plates to detect a strength of a magnetic field to be produced by the electric current to be passed through the bus bar, a core, which is made of a magnetic material and disposed between the one pair of the shield plates, and a winding, which includes one part wound around the core, and an other part wound around either of the shield plates.
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公开(公告)号：US20190187187A1
公开(公告)日：2019-06-20
申请号：US16208890
申请日：2018-12-04
Applicant: Hitachi Metals, Ltd.
Inventor： Jun UMETSU , Naoki FUTAKUCHI , Haruyasu KOMANO , Ken OKUYAMA , Yujiro TOMITA
CPC classification number: G01R19/0092 , G01R1/04 , G01R15/207 , H01R25/16
Abstract: A current sensor includes a bus bar in which a current to be detected flows, a circuit board mounted with a magnetic detection element thereon to detect a strength of a magnetic field generated by a current flowing in the bus bar, and a housing including first and second housings provided in such a manner as to sandwich the bus bar and the circuit board therebetween in a plate thickness direction of the bus bar. The first and second housings include slide guide portions respectively which are relatively slidable in a sloping direction with respect to the plate thickness direction of the bus bar while abutting each other in the plate thickness direction of the bus bar.
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公开(公告)号：US20190170793A1
公开(公告)日：2019-06-06
申请号：US16157192
申请日：2018-10-11
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Naoki FUTAKUCHI , Haruyasu KOMANO , Jun UMETSU , Yujiro TOMITA
IPC: G01R15/20 , G01R33/09 , G01R33/025 , G01R19/00 , G01R15/14
Abstract: A current sensor includes first and second bus bars aligned and arranged in such a manner to be spaced from each other in a plate width direction, a third bus bar arranged in such a manner that a plate thickness direction thereof coincides with a plate thickness direction of the first and second bus bars and a length direction thereof is orthogonal to a length direction of the first and second bus bars, first and second magnetic detection elements arranged opposite the first and second bus bars respectively in the plate thickness direction, and a third magnetic detection element arranged opposite the third bus bar in the plate thickness direction. The first and second magnetic detection elements are gradient detection type magnetic detection elements and are arranged in such a manner that a detection axis direction thereof is perpendicular to the length direction of the first and second bus bars and is tilted with respect to the plate thickness direction of the first and second bus bars. The third magnetic detection element is arranged in such a manner that a detection axis direction thereof coincides with a plate width direction of the third bus bar.
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公开(公告)号：US20170285075A1
公开(公告)日：2017-10-05
申请号：US15471134
申请日：2017-03-28
Applicant: Hitachi Metals, Ltd.
Inventor： Ken OKUYAMA , Naoki FUTAKUCHI , Katsuya AKIMOTO , 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 a magnetic material and are arranged to sandwich the busbar in a thickness direction of the busbar. The busbar includes a through-hole penetrating therethrough and current paths formed on both sides of the through-hole, the magnetic sensing element is arranged at a position overlapping the through-hole in the thickness direction of the busbar. The busbar is arranged in a space between the pair of shield plates such that the center in the thickness direction is located at a position offset from the center of the space in the thickness direction.
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