WO2016017333A1 - Blindage magnétique et procédé de production associé - Google Patents

Blindage magnétique et procédé de production associé Download PDF

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Publication number
WO2016017333A1
WO2016017333A1 PCT/JP2015/068425 JP2015068425W WO2016017333A1 WO 2016017333 A1 WO2016017333 A1 WO 2016017333A1 JP 2015068425 W JP2015068425 W JP 2015068425W WO 2016017333 A1 WO2016017333 A1 WO 2016017333A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
magnetic shield
caulking
portions
shield
Prior art date
Application number
PCT/JP2015/068425
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English (en)
Japanese (ja)
Inventor
達之 山口
Original Assignee
株式会社東海理化電機製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社東海理化電機製作所 filed Critical 株式会社東海理化電機製作所
Publication of WO2016017333A1 publication Critical patent/WO2016017333A1/fr
Priority to US15/390,919 priority Critical patent/US20170108631A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices

Definitions

  • the present invention relates to a magnetic shield and a manufacturing method thereof, and more particularly, to a magnetic shield used in a current sensor for detecting a current flowing in a conductor and a manufacturing method thereof.
  • a current sensor that detects a current flowing through a conductor by measuring a magnetic flux generated by a current flowing through the conductor is known (see, for example, Patent Documents 1 and 2).
  • the current sensors disclosed in Patent Documents 1 and 2 include an annular core (magnetic shield) having a gap on one side.
  • the core is made of a grain-oriented electrical steel sheet having an easy axis of magnetization in a certain direction.
  • a conductor such as a conductive wire or a bus bar is inserted in the hollow portion of the core, and the detection element is arranged in the gap of the core, thereby detecting a magnetic flux change generated in the core as a current. Yes.
  • the core (magnetic shield) used in the current sensor disclosed in Patent Document 1 is manufactured by the following manufacturing processes (1) to (4).
  • a step of extracting the first core member having concave and convex attachment portions at four corners by pressing (2) A step of extracting the second core member having uneven mounting portions at four corners by pressing, (3) By pressing the second core member into the previously extracted first core member, the convex portion of the mounting portion of the second core member is press-fitted into the concave portion of the mounting portion of the first core member.
  • the core (magnetic shield) used in the current sensor disclosed in Patent Document 2 is manufactured by the following manufacturing processes (5) to (10).
  • the manufacturing method of the core used for the current sensor disclosed in Patent Document 1 is formed by forming a concave and convex mounting portion on each of the directional electromagnetic steel sheets, and superimposing multiple directional electromagnetic steel sheets. Unless the steps (1) to (3) for forming the core shape are repeated, the core cannot be mass-produced. Therefore, production efficiency is low.
  • An object of the present invention is to provide a magnetic shield that is low in cost and excellent in dimensional accuracy, and a method for manufacturing the same.
  • a magnetic shield according to an embodiment of the present invention includes a shield part that surrounds a current path through which a current flows and a magnetic detection element that detects a current flowing through the current path, and the shield part includes at least two magnetic elements.
  • a plate material is laminated, a bending portion where the laminated magnetic plate material is bent, and a caulking portion that is caulked together by plastic deformation of predetermined portions of the bending portion.
  • the bending portion according to [1] includes two opposing side wall portions and a connecting wall portion that connects the two side wall portions.
  • the caulking portion according to [1] or [2] is caulked in a lump by plastically deforming predetermined portions of both edge portions of the bent portion.
  • the caulking portion according to [2] is formed at at least three locations including two locations on the two sidewall portions and one location on the connecting wall portion at one end in the width direction of the sidewall portion. .
  • the caulking portion according to [1] to [4] includes a plastic deformation structure formed in a direction orthogonal to the stacking direction of the magnetic plate members.
  • the caulking portion according to [1] to [4] includes a plastic deformation structure formed in a direction along the stacking direction of the magnetic plate members.
  • a method of manufacturing a magnetic shield according to an embodiment of the present invention includes a step of laminating at least two long belt-like magnetic plates, and bending a plurality of bent portions along the longitudinal direction of the laminated magnetic plates. And a step of collectively caulking predetermined portions of the plurality of bent portions, and a step of cutting the plurality of bent portions into a predetermined length.
  • FIG. 1 is an explanatory diagram showing a current sensor including a magnetic shield according to a first embodiment suitable for the present invention.
  • FIG. 2 is a perspective view showing the magnetic shield according to the first embodiment.
  • FIG. 3A is an explanatory diagram illustrating the method of manufacturing the magnetic shield according to the first embodiment.
  • FIG. 3B is an explanatory diagram illustrating the method of manufacturing the magnetic shield according to the first embodiment.
  • FIG. 3C is an explanatory view showing the method of manufacturing the magnetic shield according to the first embodiment.
  • FIG. 3D is an explanatory view showing the method of manufacturing the magnetic shield according to the first embodiment.
  • FIG. 3E is an explanatory view showing the method of manufacturing the magnetic shield according to the first embodiment.
  • FIG. 4A is a perspective view showing a magnetic shield according to the second embodiment.
  • FIG. 4B is an enlarged perspective view showing a caulking portion of the magnetic shield.
  • FIG. 5 is a perspective view showing a magnetic shield according to the third embodiment.
  • reference numeral 10 generally indicates a current sensor having a typical magnetic shield in the first embodiment.
  • the current sensor 10 is used to detect the magnitude of a current flowing through a drive motor and an external device such as a battery in a hybrid vehicle or an electric vehicle, for example.
  • the current sensor 10 includes a current path 20 such as a bus bar or a cable through which a current flows, a magnetic detection element 30 that detects a magnetic field generated by a current flowing through the current path 20, and the current path 20 and the magnetic detection. And a magnetic shield 40 surrounding the element 30.
  • a current path 20 such as a bus bar or a cable through which a current flows
  • a magnetic detection element 30 that detects a magnetic field generated by a current flowing through the current path 20, and the current path 20 and the magnetic detection.
  • a magnetic shield 40 surrounding the element 30.
  • the magnetic detection element 30 for example, a Hall IC in which electronic components such as an amplifier are packaged as an integrated circuit, a packaged magnetoresistive IC, or the like is used.
  • a material of the magnetic shield 40 for example, a magnetic plate material (hereinafter referred to as “electromagnetic steel plate”) such as a directional electromagnetic steel plate or a non-oriented electromagnetic steel plate made of a silicon steel plate is used.
  • the magnetic detection element 30 is mounted on a substrate (not shown).
  • the board is provided with a connector having connection terminals electrically connected to a processing circuit for processing the output from the magnetic detection element 30.
  • the connector is electrically connected to an external device such as a control unit (not shown).
  • the magnetic shield 40 is used to reduce the influence of a disturbance magnetic field other than a magnetic field due to an electric current.
  • the magnetic shield 40 is formed by stacking at least two electromagnetic steel plates 41 and bending them.
  • the magnetic shield 40 includes a substantially U-shaped bent portion 44 in which one side ends of the opposed long strip-like side wall portions 42, 42 are bent with a connecting wall portion 43.
  • the bending portion 44 is configured as a shield portion of the magnetic shield 40.
  • a caulking portion 45 is formed at a predetermined portion of the edge portion of the bending portion 44, and the electromagnetic steel plates 41 are fixed by the caulking portion 45 so as not to be relatively displaced.
  • the caulking portion 45 is not a caulking portion that fits and press-fits an uneven caulking portion processed on each electromagnetic steel sheet itself.
  • the caulking portion 45 is formed by plastically deforming predetermined portions of the edge portions of the laminated electromagnetic steel plates 41 and caulking them together.
  • the caulking portion 45 it is preferable that the caulking portion 45 is caulked in a lump by plastically deforming a position closer to the tip of both end edges of the side wall portion 42 of the magnetic shield 40 and an intermediate position between both end edges of the connecting wall portion 43. is there. Predetermined portions of these edge portions have a substantially wedge-shaped cross-sectional shape that narrows toward the inside of the plate thickness.
  • the method of manufacturing the magnetic shield 40 includes a step of laminating the three long belt-like electromagnetic steel plates 41,..., 41, and bending the laminated electromagnetic steel plates 41 into a wave shape. This is effectively achieved by a series of steps including a step, a step of caulking each of the bent electromagnetic steel plates 41, and a step of cutting each of the bent electromagnetic steel plates 41.
  • the magnetic shield 40 In manufacturing the magnetic shield 40, first, as shown in FIG. 3A, three long strip-shaped electromagnetic steel plates 41 having a predetermined length and width are overlapped and stacked.
  • the thickness of the magnetic plate made of the three electromagnetic steel plates 41 is, for example, about 1 mm.
  • the laminated long strip-shaped electromagnetic steel plates 41 are bent into a wave shape over the longitudinal direction by an upper mold and a lower mold (not shown).
  • a plurality of substantially U-shaped bent portions 44 are formed in which one side ends of the opposed long belt-like side wall portions 42 are bent by the connecting wall portions 43.
  • each bending portion 44 is pressed from a substantially horizontal direction by the pressing surface 51 of the caulking jig 50.
  • the pressing surface 51 corresponding to the connecting wall portion 43 in the caulking jig 50 into an oblique structure, the steel plate end face is plastically deformed inward in the vertical direction by pressing the caulking jig 50 from the horizontal direction.
  • a crimped caulking portion 45 is formed.
  • the electromagnetic steel sheet 41 is separated into a large number of bending parts 44 by cutting the side wall part 42 of each bending part 44 into a predetermined length along the cutting line CL.
  • the cut bending portion 44 is subjected to an annealing treatment. By annealing, the distortion in the electromagnetic steel sheet 41 is removed, the magnetic characteristics are stabilized, and the shape of the bending portion 44 is corrected.
  • the laminated long strip-shaped electromagnetic steel sheet 41 When the laminated long strip-shaped electromagnetic steel sheet 41 is bent into a wave shape, a position closer to the tip of both end edges of the side wall 42 in the bent portion 44 and an intermediate position between both end edges of the connecting wall 43 are set. Of course, they can be caulked together. Since the laminated bending portions 44 are caulked together, the electromagnetic steel plates 41 are not separated from each other when the laminated long strip-like electromagnetic steel plates 41 are folded back. It can prevent that a clearance gap arises in a steel plate lamination
  • FIG. 4A and 4B schematically illustrate a configuration example of the magnetic shield 40 according to the second embodiment.
  • the caulking portion 45 is formed on the edge portion of the magnetic shield 40.
  • the inner surface of the edge portion of the magnetic shield 40 is used. This is different from the first embodiment in that the caulking portion 45 is formed. Therefore, by using the same member code as the member code used in the first embodiment, detailed description about the member is omitted.
  • the caulking portion 45 formed on the inner surface of the edge portion of the magnetic shield 40 can be formed at the same time as the laminated strip-shaped electromagnetic steel sheet 41 is bent into a wave shape over the longitudinal direction.
  • the caulking portion 45 is formed at a position closer to the tip of the inner surface of both ends of the side wall portion 42 of the magnetic shield 40 and an intermediate position of the inner surface of both ends of the connecting wall portion 43. It has a concave cross-sectional shape toward the thickness direction.
  • FIG. 5 schematically illustrates a configuration example of the magnetic shield 40 according to the third embodiment.
  • the caulking pieces 46 are formed at both end edges near the tip of the side wall 42 of the magnetic shield 40 corresponding to the innermost electromagnetic steel plate 41 and both end edges of the connecting wall 43.
  • the caulking piece 46 is formed by punching out the electromagnetic steel plates 41 laminated and arranged at the bottom of the three electromagnetic steel plates 41. A jig is applied to the caulking piece 46, and the caulking piece 46 is pressed inward so as to be plastically deformed, and the magnetic shield 40 is caulked and fixed together.
  • FIG. 6 schematically illustrates a configuration example of the magnetic shield 40 according to the fourth embodiment.
  • the caulking hole 47 and the rivet 48 are configured as caulking portions.
  • caulking holes 47 are formed penetrating at positions closer to the tips of the inner surfaces of both end edges of the side wall 42 and intermediate positions of the inner surfaces of both end edges of the connecting wall 43.
  • Three electromagnetic steel plates 41 each having a caulking hole 47 are stacked on top of each other, a shaft portion of a rivet 48 is inserted into each caulking hole 47, and a tip portion of the shaft portion is crushed to form three sheets.
  • the electromagnetic steel plates 41 are fixed together by rivet caulking.
  • the magnetic shield 40 according to the present invention can be modified as follows.
  • the magnetic shield 40 can be applied to a core that collects magnetic flux generated by the current flowing through the current path 20.
  • the arrangement position, the arrangement number, the shape, and the like of the caulking portion of the magnetic shield 40 can be appropriately selected according to the magnetic performance, strength, and the like of the magnetic shield 40.
  • the present invention can be applied to electric circuits other than electric circuits connected to vehicle motors and batteries.
  • the present invention can be applied to a drive motor used in a hybrid vehicle or an electric vehicle, and a current sensor having a magnetic detection element for detecting a current flowing in a battery.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

L'invention concerne un blindage magnétique à faible coût doté d'une excellente précision dimensionnelle, ainsi qu'un procédé de production associé. Le blindage magnétique (40) selon l'invention est pourvu d'une partie bouclier (42, 43) entourant un trajet de courant (20) à travers lequel passe le courant, et d'un élément de détection magnétique (30) destiné à détecter le courant passant à travers le trajet de courant (20). La partie bouclier (42, 43) comprend au moins deux éléments plaques magnétiques stratifiées (41), une partie courbée (44) au niveau de laquelle sont courbés les éléments plaques magnétiques stratifiées (41), ainsi qu'une partie sertie (45) dans laquelle un emplacement déterminé de la partie courbée (44) est serti dans son ensemble par déformation plastique.
PCT/JP2015/068425 2014-06-30 2015-06-25 Blindage magnétique et procédé de production associé WO2016017333A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/390,919 US20170108631A1 (en) 2014-06-30 2016-12-27 Band-pass filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014153958A JP2016031293A (ja) 2014-07-29 2014-07-29 磁気シールド及びその製造方法
JP2014-153958 2014-07-29

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/390,919 Continuation US20170108631A1 (en) 2014-06-30 2016-12-27 Band-pass filter

Publications (1)

Publication Number Publication Date
WO2016017333A1 true WO2016017333A1 (fr) 2016-02-04

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PCT/JP2015/068425 WO2016017333A1 (fr) 2014-06-30 2015-06-25 Blindage magnétique et procédé de production associé

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WO (1) WO2016017333A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109313223A (zh) * 2016-06-15 2019-02-05 株式会社电装 电流传感器
CN110709711A (zh) * 2017-06-14 2020-01-17 三菱电机株式会社 电流检测装置及功率转换装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6385632B1 (ja) * 2017-06-14 2018-09-05 三菱電機株式会社 電流検出装置及び電力変換装置
JP6870115B2 (ja) * 2017-12-13 2021-05-12 アルプスアルパイン株式会社 電流センサ
JPWO2023188787A1 (fr) * 2022-03-30 2023-10-05

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5649654A (en) * 1979-09-28 1981-05-06 Sanyo Electric Co Ltd Fixing method of laminated iron core
JP2001006957A (ja) * 1999-06-23 2001-01-12 Mitsubishi Electric Corp 鉄心およびその製造方法
JP2013152221A (ja) * 2011-12-27 2013-08-08 Denso Corp 電流センサ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5649654A (en) * 1979-09-28 1981-05-06 Sanyo Electric Co Ltd Fixing method of laminated iron core
JP2001006957A (ja) * 1999-06-23 2001-01-12 Mitsubishi Electric Corp 鉄心およびその製造方法
JP2013152221A (ja) * 2011-12-27 2013-08-08 Denso Corp 電流センサ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109313223A (zh) * 2016-06-15 2019-02-05 株式会社电装 电流传感器
CN109313223B (zh) * 2016-06-15 2021-02-26 株式会社电装 电流传感器
CN110709711A (zh) * 2017-06-14 2020-01-17 三菱电机株式会社 电流检测装置及功率转换装置

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Publication number Publication date
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