WO2023136125A1 - 電流センサ装置 - Google Patents

電流センサ装置 Download PDF

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Publication number
WO2023136125A1
WO2023136125A1 PCT/JP2022/048040 JP2022048040W WO2023136125A1 WO 2023136125 A1 WO2023136125 A1 WO 2023136125A1 JP 2022048040 W JP2022048040 W JP 2022048040W WO 2023136125 A1 WO2023136125 A1 WO 2023136125A1
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WO
WIPO (PCT)
Prior art keywords
width
recess
conductor
magnetic detection
detection element
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/048040
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English (en)
French (fr)
Japanese (ja)
Inventor
守 津田
憲右 三林
小太郎 表
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Corp
Original Assignee
Aisin Corp
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 Aisin Corp filed Critical Aisin Corp
Priority to EP22920642.0A priority Critical patent/EP4407324A4/en
Priority to US18/703,960 priority patent/US20250231225A1/en
Priority to CN202280082170.1A priority patent/CN118382812A/zh
Priority to JP2023573967A priority patent/JPWO2023136125A1/ja
Publication of WO2023136125A1 publication Critical patent/WO2023136125A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • G01R15/207—Constructional details independent of the type of device used
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Measuring current only
    • 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
    • G01R15/202—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 using Hall-effect devices

Definitions

  • This technology relates to a current sensor device that measures the current flowing through a conductor.
  • a current sensor device for measuring current is provided in a device that uses a relatively large current, such as an inverter for a three-phase AC motor.
  • a current sensor device for example, there is known a device in which a conductor (hereinafter referred to as a bus bar) is provided with a slit for changing the direction of current flow, and a magnetic detection element is arranged in the slit (see Patent Document 1). ).
  • a current is made to flow in an arc around the magnetic detection element, increasing the input magnetic flux to the magnetic detection element and improving the SN ratio.
  • Two magnetic detection elements are provided, and positive and negative magnetic fluxes are input to these magnetic detection elements, and positive and negative voltages are generated in the magnetic detection elements. Then, the current is detected by calculating the differential voltage in the signal processing circuit.
  • a configuration in which a plurality of bus bars equipped with such current sensor devices are arranged side by side at predetermined intervals (see Patent Document 2).
  • JP 2018-141634 A Japanese Patent Publication No. 2003-510612
  • a current sensor device as one aspect of the present invention includes a first conductor and a second conductor arranged at a predetermined interval; a first detection unit having two magnetic detection elements and detecting a current in the first conductor based on detection results of the first magnetic detection element and the second magnetic detection element; It has a third magnetic detection element and a fourth magnetic detection element that detect the generated magnetism, and detects the current of the second conductor based on the detection results of the third magnetic detection element and the fourth magnetic detection element.
  • the first conductor has a first wide part through which a current flows in a first direction and has a first width in a direction perpendicular to the first direction; a first narrow width portion having a second width narrower than the first width in a direction orthogonal to the second direction, wherein the first magnetic detecting device
  • the element and the second magnetic detection element are arranged in a first stacking direction with respect to the surface of the first narrow portion, and are arranged side by side in a direction along the surface of the first narrow portion, and the second conductor A current flows in a third direction, a second wide portion having a third width in a direction orthogonal to the third direction, and a current flows in a fourth direction intersecting the third direction, and the a second narrow width portion having a fourth width narrower than the third width in a direction perpendicular to the fourth direction; They are arranged in the second stacking direction with respect to the surface of the second narrow portion, and are arranged side by side in the direction along the surface of the second narrow portion
  • a current sensor device as another aspect of the present invention includes a conductor, and a first magnetic detection element and a second magnetic detection element for detecting magnetism generated by a current flowing through the conductor, a detection unit that detects a current in the conductor based on detection results of the detection element and the second magnetic detection element, the current flowing in the conductor in a first direction and a direction orthogonal to the first direction. and a wide portion having a width of a first width, and a second width having a width in a direction orthogonal to the second direction that is narrower than the first width while a current flows in a second direction that intersects the first direction.
  • a certain narrow portion defines an upstream side of the narrow portion in the first direction, and one of two side edges of the wide portion on the downstream side in the second direction is defined as a base end in the second direction. and a first recess having a shape recessed in the opposite direction to the narrow width portion on the downstream side in the first direction, and one of the two side edges of the wide portion on the upstream side in the second direction.
  • a second concave portion having a shape concave in the second direction with the side edge as a base end, and the first magnetic detecting element and the second magnetic detecting element are arranged in the stacking direction with respect to the surface of the narrow portion.
  • the width of the first portion including the base end in the first direction is defined as the width of the first recess
  • the width in the first direction in the second portion including the tip in the direction opposite to the second direction is set to be a second recess width smaller than the first recess width, and when viewed from the first direction, the width of the first recess is The tip and the tip of the second recess are aligned, or at least a portion of the second portion overlaps the second recess.
  • FIG. 1 is a schematic diagram showing a vehicle according to a first embodiment
  • FIG. 1 is a perspective view showing a current sensor device according to a first embodiment
  • FIG. 1 is an exploded perspective view showing a current sensor device according to a first embodiment
  • FIG. 1 is a plan view showing a current sensor device according to a first embodiment
  • FIG. 1 is a plan view of a main part showing a current sensor device according to a first embodiment
  • FIG. FIG. 5 is a cross-sectional view taken along line AA of FIG. 4
  • 1 is a wiring diagram showing a package according to a first embodiment
  • FIG. It is a sectional view showing the state where the current sensor device concerning a 1st embodiment was attached to the case of the inverter device.
  • FIG. 4 is a graph showing the relationship between the busbar pitch and magnetic interference in the current sensor device according to the first embodiment;
  • FIG. 7 is a plan view of the main parts showing the current sensor device according to the second embodiment;
  • FIG. 8 is an enlarged plan view showing one busbar of the current sensor device according to the second embodiment;
  • FIG. 10 is an enlarged plan view showing one busbar of the current sensor device according to the comparative example, which is comparative example 1 with a bite amount of 0 mm;
  • FIG. 11 is an enlarged plan view showing one bus bar of a current sensor device according to a comparative example, which is comparative example 2 with a bite amount of 1 mm;
  • FIG. 11 is an enlarged plan view showing one busbar of a current sensor device according to a comparative example, which is a comparative example 3 with a bite amount of 2 mm;
  • FIG. 11 is an enlarged plan view showing one bus bar of a current sensor device according to a comparative example, which is comparative example 4 with a bite amount of 3 mm;
  • FIG. 11 is an enlarged plan view showing one bus bar of a current sensor device according to a comparative example, which is comparative example 5 with a bite amount of 4 mm;
  • 4 is a graph showing the relationship between the amount of bite and the differential magnetic flux density in Examples and Comparative Examples.
  • FIG. 11 is an enlarged plan view showing one busbar of the current sensor device according to the modified example of the second embodiment;
  • FIG. 11 is an enlarged plan view showing one busbar of a current sensor device according to another modification of the second embodiment;
  • FIG. 11 is an enlarged plan view showing one busbar of a current sensor device according to still another modification of the second embodiment;
  • FIG. 1 A first embodiment of a current sensor device according to the present disclosure will be described below with reference to FIGS. 1 to 10.
  • FIG. 1 a case where a current sensor device is mounted in an inverter device 3 for controlling a three-phase AC motor 2 for driving a vehicle is described.
  • the vehicle 1 is, for example, an electric vehicle, a hybrid vehicle, or the like, which can run using a three-phase AC motor 2 as a drive source.
  • a vehicle 1 has a three-phase AC motor 2 , an inverter device 3 for controlling the three-phase AC motor 2 , and a power supply 4 .
  • the three-phase AC motor 2 is a three-phase induction motor, and in this embodiment, it has three phases: a U phase (first phase), a V phase (second phase), and a W phase (third phase).
  • the three-phase AC motor 2 is an example of a rotating electric machine that operates on a three-phase AC, and a known one can be applied, so a detailed description of the configuration and the like will be omitted.
  • the inverter device 3 has an inverter circuit 5 , an ECU 6 and a current sensor device 7 .
  • the inverter circuit 5 has a switching element corresponding to each phase of the three-phase AC motor 2 , controls the output to each phase under the control of the ECU 6 , and operates the three-phase AC motor 2 .
  • the inverter circuit 5 and the ECU 6 known ones can be applied, so detailed description of the configuration and the like will be omitted.
  • the current sensor device 7 is connected between the inverter circuit 5 and the three-phase AC motor 2 .
  • the current sensor device 7 is attached to the aluminum die-cast case 3 a of the inverter device 3 .
  • the current sensor device 7 will be described below with reference to FIGS. 2 to 10.
  • the busbars 11, 12, and 13 are examples of conductors and are made of copper, for example. 12 is connected to a V-phase coil, and a bus bar 13, which is an example of a third conductor, is connected to a W-phase, and each is connected to an inverter circuit 5 (see FIG. 1). Each bus bar 11, 12, 13 is arranged at a predetermined interval.
  • the first width w1 (see FIG. 5) of the busbars 11, 12 and 13 is 10 mm
  • the pitch p1 (see FIG. 5) of the busbars 11, 12 and 13 is 14 mm.
  • the first width w1 and the pitch p1 of the busbars 11, 12, 13 are not limited to these, and other values may be used, or the pitch of the busbars 11, 12 and the pitch of the busbars 12, 13 may be different. good.
  • the board 14 is an example of a first board and a second board, and is a printed board on which electronic components are mounted.
  • packages 21, 22, and 23 for magnetic detection are mounted.
  • the busbars 11, 12, 13, the packages 21, 22, 23, and the substrate 14 are stacked in the stacking direction Dz.
  • the heat dissipation plate 16 is an example of a heat dissipation member, and is arranged on the side opposite to the substrate 14 with respect to the busbars 11, 12, and 13 in the stacking direction Dz. Details of the heat sink 16 will be described later.
  • FIG. 1 Each of the packages 21, 22, and 23 is a sensor that incorporates two magnetic detection elements and measures magnetic flux.
  • the package 23 is arranged facing each bus bar 11, 12, 13 so as to measure the magnetic flux generated when the bus bar 13 is energized. Further, in FIG. 5, the dashed-dotted line arrows indicate the direction of current flow for the busbars 11, 12, and 13.
  • the packages 21, 22, and 23 have the same configuration except for the objects to be measured. Therefore, the package 21 will be representatively described below, and the description of the packages 22 and 23 will be omitted. do.
  • portions of busbars 11, 12, and 13 that face packages 21, 22, and 23 have the same structure, so busbar 11 will be representatively described below, and busbars 12 and 13 will be described below. omitted.
  • the busbar 11 has slits 11a and 11b formed by notching the center side from one side edge and the other side edge in the longitudinal direction. Each of the slits 11 a and 11 b is arranged facing the longitudinal direction of the bus bar 11 .
  • the busbar 11 has a wide portion 11w, which is an example of a first wide portion, and 11n, which is an example of a first narrow portion.
  • the wide portion 11w allows current to flow in the first direction D1, and has a first width w1 in the direction orthogonal to the first direction D1.
  • the narrow portion 11n is a region between the slits 11a and 11b, in which a current flows in a second direction D2 intersecting the first direction D1, and the width in the direction orthogonal to the second direction D2 is larger than the first width w1. is the narrow second width w2. That is, the direction in which the current flows is changed in the narrow width portion 11n.
  • the busbar 12 has slits 12a and 12b formed by notching the other side edge and the one side edge toward the center in the longitudinal direction. Each of the slits 12a and 12b is arranged to face the busbar 12 in the longitudinal direction.
  • the busbar 12 has a wide portion 12w, which is an example of a second wide portion, and 12n, which is an example of a second narrow portion.
  • the wide portion 12w allows current to flow in the third direction D3, and has a third width w3 in the direction orthogonal to the third direction D3.
  • the narrow portion 12n is a region between the slits 12a and 12b, in which current flows in a fourth direction D4 intersecting the third direction D3, and the width in the direction perpendicular to the fourth direction D4 is greater than the third width w3. is the narrow fourth width w4.
  • the busbar 13 has slits 13a and 13b formed by notching the center side from one side edge and the other side edge in the longitudinal direction. Each of the slits 13a and 13b is arranged to face the busbar 13 in the longitudinal direction.
  • the bus bar 13 also has a wide portion 13w, which is an example of a third wide portion, and 13n, which is an example of a third narrow portion. The wide portion 13w allows current to flow in the fifth direction D5, and has a fifth width w5 in the direction orthogonal to the fifth direction D5.
  • the narrow portion 13n is a region between the slits 13a and 13b, in which current flows in a sixth direction D6 intersecting the fifth direction D5, and the width in the direction orthogonal to the sixth direction D6 is greater than the fifth width w5. is the narrow sixth width w6.
  • the direction of the notch of the slit is the same for the busbars 11 and 13 and the opposite direction for the busbar 12, but is not limited to this. can be
  • the package 21 is an example of a first detection unit, and includes two magnetic detection elements, a first Hall element 21a which is an example of a first magnetic detection element for detecting magnetism generated by a current flowing through the bus bar 11, and a second magnetic detection element. and a second Hall element 21b, which is an example of a detection element.
  • the package 21 detects the current of the busbar 11 based on the detection results of the first Hall element 21a and the second Hall element 21b.
  • the first hall element 21a and the second hall element 21b are arranged side by side so as to overlap the narrow width portion 11n of the bus bar 11 and be adjacent to each other. That is, the first Hall element 21a and the second Hall element 21b are arranged in the first stacking direction Dz (see FIG. 6) with respect to the surface of the narrow portion 11n of the bus bar 11, and along the surface of the narrow portion 11n. arranged side by side.
  • the package 22 is an example of a second detection unit, and includes a third Hall element 22a which is an example of a third magnetic detection element for detecting magnetism generated by a current flowing through the bus bar 12, and a third Hall element 22a. and a fourth Hall element 22b, which is an example of a fourth magnetic detection element.
  • the package 22 detects the current of the busbar 12 based on the detection results of the third Hall element 22a and the fourth Hall element 22b.
  • the third Hall element 22a and the fourth Hall element 22b are arranged side by side so as to overlap the narrow width portion 12n of the bus bar 12 and be adjacent to each other. That is, the third Hall element 22a and the third Hall element 22b are arranged in the second stacking direction Dz (see FIG. 6) with respect to the surface of the narrow portion 12n of the bus bar 12, and along the surface of the narrow portion 12n. arranged side by side.
  • the package 23 is an example of a third detection unit, and includes a fifth Hall element 23a which is an example of a fifth magnetic detection element for detecting magnetism generated by a current flowing through the bus bar 13, and a second magnetic detection element. and a sixth Hall element 23b, which is an example of six magnetic detection elements.
  • the package 23 detects the current of the busbar 13 based on the detection results of the fifth Hall element 23a and the sixth Hall element 23b.
  • the fifth hall element 23a and the sixth hall element 23b are arranged side by side so as to overlap the narrow width portion 13n of the bus bar 13 and be adjacent to each other. That is, the fifth Hall element 23a and the sixth Hall element 23b are arranged in the third stacking direction Dz (see FIG. 6) with respect to the surface of the narrow portion 13n of the busbar 13, and along the surface of the narrow portion 13n. arranged side by side.
  • FIG. 6 it is assumed that the current flows through the narrow portion 11n of the bus bar 11 to the opposite side of the drawing. At this time, a clockwise magnetic flux is generated around the narrow portion 11n around the direction in which the current flows.
  • the package 21 is arranged to face this magnetic flux.
  • the first hall element 21a can catch the magnetic flux in the direction Z1 away from the busbar 11, and the second hall element 21b can catch the magnetic flux in the direction Z2 approaching the busbar 11. can catch.
  • the package 21 can generate a differential output of the positive and negative voltages obtained by the first Hall element 21a and the second Hall element 21b.
  • a current value of the bus bar 11 can be obtained based on the output signal.
  • the second width w2 is less than twice the pitch d1, the narrow portion 11n is too narrow, which may cause local overheating. Moreover, if the second width w2 exceeds three times the pitch d1, the size of the current sensor device 7 will be increased. Therefore, the second width w2 is preferably two times or more and three times or less the pitch d1. In this embodiment, the pitch d1 between the first Hall element 21a and the second Hall element 21b is set to 2.5 mm, for example. The second width w2 of the narrow portion 11n is, for example, 6 mm.
  • the fourth width w4 of the narrow portion 12n and the sixth width w6 of the narrow portion 13n are preferably two times or more and three times or less the pitch d1.
  • the width w4 and the sixth width w6 are set to 6 mm, for example. Therefore, it is possible to realize a well-balanced configuration that does not cause local overheating and does not increase the size of the current sensor device 7 .
  • FIG. 1 Radiator plate 16 is connected to bus bars 11 , 12 , 13 so as to be heat conductive, and radiates heat from bus bars 11 , 12 , 13 .
  • the heat sink 16 is made of a non-magnetic metal such as brass, does not affect the magnetic fluxes generated in the bus bars 11, 12, 13, and maintains high detection accuracy.
  • the busbars 11, 12, 13 and the radiator plate 16 are formed integrally with the housing 15 made of resin by injection molding. As shown in FIG. 8, the bus bar 11 and the heat sink 16 are not in direct contact with each other, but are in contact with each other through the housing 15. However, the heat of the bus bar 11 is dissipated through the heat sink 16 without any other components interposed therebetween. can be released from The same applies to the busbars 12 and 13 as well. As shown in FIGS. 8 and 9, the heat sink 16 is exposed on the rear side of the housing 15. As shown in FIGS.
  • the current sensor device 7 is attached to the case 3a of the inverter device 3 via the heat radiation sheet 8, and the heat radiation plate 16 is attached to the case 3a via the heat radiation sheet 8 so as to be in contact with the case 3a.
  • the case 3a is made of die-cast aluminum, for example, and has a flow path 3b through which cooling water (indicated by an arrow in FIG. 8) flows inside the wall. Therefore, it is preferable to install the current sensor device 7 in the vicinity of the flow path 3b from the viewpoint of cooling efficiency.
  • the radiator plate 16 has a pin-shaped protrusion 16a that protrudes in the stacking direction Dz.
  • six protruding portions 16 a are provided so as to pass through the slits of the bus bars 11 , 12 , 13 .
  • the projecting portion 16a is connected to the substrate 14 by soldering so as to be heat conductive. That is, the heat sink 16 can radiate heat from the busbars 11 , 12 and 13 and can also radiate heat from the substrate 14 heated by the busbars 11 , 12 and 13 .
  • a concave portion 15a is formed in a portion of the housing 15 facing the package 21.
  • a space S which is a first air layer, is formed between the package 21 and the housing 15 . That is, a space S is interposed between the busbar 11 and the package 21 .
  • spaces are interposed which are the second air layer and the third air layer.
  • the substrate 14 is formed with a through hole 14a at a position facing the projecting portion 16a of the heat sink 16.
  • the projecting portion 16a of the radiator plate 16 is passed through the through hole 14a of the substrate 14, and the projecting portion 16a is connected to the substrate 14 by soldering so as to be heat conductive while the substrate 14 is supported by the housing 15.
  • the current sensor device 7 is attached to the case 3a of the inverter device 3, and the packages 21, 22, 23 are connected to the U-phase, V-phase, and W-phase of the three-phase AC motor 2 via the bus bars 11, 12, and 13, respectively. Connect to each coil.
  • the example can maintain high accuracy. Therefore, if the accuracy is the same, it is possible to reduce the size of the current sensor device 7 by narrowing the space between the busbars.
  • the first Hall element 21a and the second Hall element 21b are arranged in the stacking direction Dz with respect to the surface of the narrow portion 11n, and 11n side by side. Therefore, compared to the case where the first Hall element 21a and the second Hall element 21b are arranged in the slits 11a and 11b, the influence of the magnetic flux from the adjacent bus bar 12 can be reduced. As a result, the pitch p1 of the busbars 11, 12, 13 can be narrowed while maintaining the accuracy of current detection, so that the size of the current sensor device 7 can be reduced.
  • the second width w2 of the narrow portion 11n is twice or more the pitch d1 between the arrangement positions of the first Hall element 21a and the second Hall element 21b, and is 3 times or more. Since it is twice or less, it is possible to avoid local overheating and to suppress an increase in the size of the device.
  • the vehicle 1 since it is provided in the inverter device 3 of the three-phase AC motor 2 mounted on the vehicle 1, the vehicle 1 can be made smaller.
  • the Hall element is applied as the magnetic detection element
  • the present invention is not limited to this. That is, as long as it is a magnetic detection element that can measure the magnetic flux generated by the flow of current, it can be widely applied to, for example, a magneto-impedance element, a magnetoresistive effect element, and the like.
  • each of the packages 21, 22, and 23 is mounted on one substrate 14 has been described, but the present invention is not limited to this.
  • each package 21, 22, 23 may be mounted on a separate substrate.
  • This current sensor device (7) is a first conductor (11) and a second conductor (12) arranged at a predetermined interval; a first magnetic detection element (21a) and a second magnetic detection element (21b) for detecting magnetism generated by a current flowing through the first conductor (11); 2 a first detection unit (21) that detects the current in the first conductor (11) based on the detection result of the magnetic detection element (21b); a third magnetic detection element (22a) and a fourth magnetic detection element (22b) for detecting magnetism generated by the current flowing through the second conductor (12); 4 a second detection unit (22) that detects the current in the second conductor (12) based on the detection result of the magnetic detection element (22b),
  • a current flows in a first direction (D1), and a first wide portion (11w) having a first width (w1) in a direction perpendicular to the first direction (D1).
  • a current flows in a second direction (D2) intersecting the first direction (D1), and a width in a direction perpendicular to the second direction (D2) is narrower than the first width (w1).
  • a first narrow portion (11n) having a width (w2);
  • the first magnetic sensing element (21a) and the second magnetic sensing element (21b) are arranged in the first stacking direction (Dz) with respect to the surface of the first narrow portion (11n), and arranged side by side in a direction along the surface of the narrow portion (11n),
  • a current flows in a third direction (D3), and a second wide portion (12w) having a third width (w3) in a direction perpendicular to the third direction (D3).
  • a current flows in a fourth direction (D4) intersecting with the third direction (D3), and a width in a direction orthogonal to the fourth direction (D4) is narrower than the third width (w3).
  • the third magnetic sensing element (22a) and the fourth magnetic sensing element (22b) are arranged in the second stacking direction (Dz) with respect to the surface of the second narrow width portion (12n), and It is preferable that they are arranged side by side in the direction along the surface of the narrow portion (12n).
  • the first magnetic detection element (21a) and the second magnetic detection element (21b) are arranged in the first stacking direction (Dz) with respect to the surface of the first narrow portion (11n). and arranged side by side in the direction along the surface of the first narrow portion (11n).
  • the influence of the magnetic flux from the adjacent second conductor (12) can make it harder to receive
  • the pitch (p1) of the first conductor (11), the second conductor (12), and the third conductor (13) can be narrowed while maintaining the accuracy of current detection. can be improved.
  • the present current sensor device (7) A first substrate (14) on which the first detection unit (21) is mounted and a second substrate (14) on which the second detection unit (22) is mounted, The first conductor (11), the first detector (21), and the first substrate (14) are laminated in the first lamination direction (Dz), and the first conductor (11) A first air layer (S) is interposed between to the first detection unit (21), The second conductor (12), the second detector (22), and the second substrate (14) are laminated in the second lamination direction (Dz), and the second conductor (12) to the second detector (22), a second air layer (S) is preferably interposed.
  • the first air layer (S) is interposed between the first conductor (11) and the first detection section (21). ) can suppress the heating of the first detection section (21) due to the heat of (1).
  • the second air layer (S) is interposed between the second conductor (12) and the second detection section (22), the heat of the second conductor (12) causes the second detection section (22) to ) can be suppressed.
  • the present current sensor device (7) The second width (w2) of the first narrow portion (11n) is at least twice the pitch of the arrangement positions of the first magnetic sensing element (21a) and the second magnetic sensing element (21b), and 3 times or less,
  • the fourth width (w4) of the second narrow portion (12n) is at least twice the pitch of the arrangement positions of the third magnetic sensing element (22a) and the fourth magnetic sensing element (22b), and Three times or less is preferable.
  • the second width (w2) of the first narrow portion (11n) is set to the arrangement positions of the first magnetic detection element (21a) and the second magnetic detection element (21b). Since the pitch (d1) is two times or more and three times or less of the pitch (d1), local overheating can be avoided and an increase in size of the device can be suppressed.
  • the present current sensor device (7) a third conductor (13) arranged at a predetermined interval with respect to the second conductor (12); a fifth magnetic detection element (23a) and a sixth magnetic detection element (23b) for detecting magnetism generated by a current flowing through the third conductor (13); 6 a third detection unit (23) that detects the current of the third conductor (13) based on the detection result of the magnetic detection element (23b),
  • a current flows in the fifth direction (D5), and a third wide portion (13w) having a fifth width (w5) in a direction perpendicular to the fifth direction (D5).
  • a current flows in a sixth direction (D6) intersecting the fifth direction (D5), and a width in a direction perpendicular to the sixth direction (D6) is narrower than the fifth width (w5).
  • a third narrow portion (13n) having a width (w6);
  • the fifth magnetic sensing element (23a) and the sixth magnetic sensing element (23b) are arranged in a third stacking direction (Dz) with respect to the surface of the third narrow width portion (13n), and have the third width arranged side by side in a direction along the surface of the narrow portion (13n),
  • the first detection section (21), the second detection section (22), and the third detection section (23) are respectively the first conductor (11), the second conductor (12), and the third conductor ( 13) to the first-phase, second-phase, and third-phase coils of the rotating electric machine (2) that operates on a three-phase alternating current.
  • the present current sensor device (7) is provided in the inverter circuit (5) of the rotary electric machine (2) mounted on the vehicle (1) and operated by a three-phase alternating current, thereby reducing the size of the vehicle (1). can be achieved.
  • FIGS. 11-18 A second embodiment of the present disclosure will now be described in detail with reference to FIGS. 11-18.
  • This embodiment differs from the first embodiment in that the shapes of the first slits 111 and the second slits 112 are different from those of the first embodiment.
  • the same reference numerals are used and detailed description thereof is omitted.
  • the bus bar 11 has slits 111 and 112 formed by notching the center side from one side edge and the other side edge in the longitudinal direction.
  • the busbar 12 has slits 121 and 122 cut from one side edge and the other side edge in the longitudinal direction toward the center, and the busbar 13 has one side edge in the longitudinal direction. It has slits 131 and 132 formed by notching the side edge and the other side edge toward the center.
  • the shape of the slits of the busbars 11, 12, 13 will be described in detail below with reference to FIG. Since the shapes of the slits of the busbars 11, 12, and 13 are the same, the busbar 11 will be used as a representative and explained here.
  • the first slit 111 is an example of a first recess, defines the upstream side in the first direction D1 of the narrow portion 11n, and is one of the two side edges of the wide portion 11w on the downstream side in the second direction D2. is a base end 111a and is recessed in the direction opposite to the second direction D2.
  • the second slit 112 is an example of a second recess, defines the downstream side of the narrow portion 11n in the first direction D1, and is one of the two side edges of the wide portion 11w on the upstream side in the second direction D2. is a base end 112a and is recessed in the second direction D2. At least a portion of the second portion 1112 overlaps the second slit 112 and at least a portion of the fourth portion 1122 overlaps the first slit 111 when viewed from the first direction D1.
  • the width in the first direction D1 in the first portion 1111 including the proximal end 111a is defined as the first recess width w11, and the width in the second portion 1112 including the distal end 111b in the direction opposite to the second direction D2.
  • the width in the direction D1 is set to a second recess width w12 that is smaller than the first recess width w11.
  • the width in the first direction D1 in the third portion 1121 including the proximal end 112a is defined as the third recess width w13
  • the width in the first direction D1 in the fourth portion 1122 including the distal end 112b in the second direction D2. is a fourth recess width w14 that is smaller than the third recess width w13.
  • the first portion 1111 has a substantially rectangular notch shape
  • the second portion 1112 is located upstream of the first portion 1111 in the second direction D2 and on the side of the narrow portion 11n. It has an arc shape extending approximately 270° around the vertex. That is, a second portion 1112 having an arc-shaped outer diameter is formed at the tip of the first portion 1111 so as to be continuous with the first portion 1111 .
  • the third portion 1121 has a substantially rectangular notch shape
  • the fourth portion 1122 extends from the third portion 1121 downstream in the second direction D2 to the narrow portion 11n side. It has an arc shape extending approximately 270° from the center.
  • first slits 111 and second slits 112 are formed at one time by, for example, punching the bus bar 11 .
  • the method for forming the first slit 111 and the second slit 112 is not limited to punching, and may be formed by cutting, for example.
  • the first recess width w11 is the width of the rectangular parallelepiped first portion 1111 and is set to 3 mm
  • the second recess width w12 is the diameter of the arc-shaped second portion 1112 and is set to 1.5 mm.
  • the third recess width w13 is the width of the rectangular parallelepiped third portion 1121 and is 3 mm
  • the fourth recess width w14 is the diameter of the arc-shaped fourth portion 1122 and is 1.5 mm.
  • the tip of the first portion 1111 in the direction opposite to the second direction D2 and the tip of the third portion 1121 in the second direction D2 match. .
  • the distal end 111b of the second portion 1112 and the distal end 112b of the fourth portion 1122 are arranged to bite in the second direction, that is, to overlap when viewed from the first direction D1.
  • d10 is 1.5 mm.
  • the second width w2 of the narrow portion 11n is the distance between the tip of the second portion 1112 on the downstream side in the first direction D1 and the tip of the fourth portion 1122 on the upstream side in the first direction D1. is 4 mm.
  • each dimension is an example and is not limited to this, and other values may be used.
  • the second portion 1112 having a shape protruding in the opposite direction to the second direction D2 is arranged at the tip of the first portion 1111, and the tip of the third portion 1121 has a shape protruding in the second direction D2.
  • the fourth portion 1122 By arranging the fourth portion 1122, the current flowing through the bus bar 11 greatly bypasses the first slit 111 and the second slit 112, and becomes the direction along the second direction D2 in the narrow portion 11n (see FIG. 12). , dash-dot line). Since the first Hall element 21a and the second Hall element 21b are arranged along the first direction D1 in the package 21, the magnetic flux density to be detected can be increased, and the S/N ratio can be improved. High detection accuracy can be obtained.
  • FIG. 14B the differential magnetic flux density and power loss were measured. The results are shown in FIG. As shown in FIG. 15, in Comparative Examples 1 to 4, the differential magnetic flux densities were lower than those of the Examples, and it was difficult to obtain detection accuracy higher than that of the Examples.
  • Comparative Example 5 it was possible to obtain a result equivalent to that of the Example in terms of differential magnetic flux density. However, in Comparative Example 5, since the length of the narrow portion 11n in the second direction D2 was longer than that of the example, heat was easily generated in the narrow portion 11n, resulting in a large power loss. Therefore, it was confirmed that the current sensor device 7 of Example has the best balance in terms of both the differential magnetic flux density and the power loss compared to the current sensor devices of Comparative Examples 1 to 5. .
  • the first slit 111 is provided with the second portion 1112 having a shape projecting in the opposite direction to the second direction D2, and the second slit 112 is provided with a fourth portion 1122 protruding in the second direction D2.
  • the current flowing through the bus bar 11 greatly bypasses the first slit 111 and the second slit 112, and is directed along the second direction D2 in the narrow width portion 11n (see the dashed line in the figure).
  • the magnetic flux density to be detected can be increased, and the S/N ratio can be improved. High detection accuracy can be obtained. Therefore, the detection accuracy can be improved without narrowing the narrow portion 11n more than necessary, so that the size of the current sensor device 7 can be reduced while suppressing heat generation.
  • the magnetic flux input to the first Hall element 21a and the second Hall element 21b is reduced compared to the case where the first Hall element 21a and the second Hall element 21b are arranged in the slit. Since the amount decreases, there is a possibility that the S/N ratio will decrease due to the influence of disturbance magnetic flux. On the other hand, it is possible to increase the amount of input magnetic flux by increasing the biting amount d10 of the first slit 111 and the second slit 112, but in this case, the cross-sectional area of the busbar 11 locally decreases, Fever is a concern.
  • the bite amount d10 of the first slit 111 and the second slit 112 is increased. Therefore, local heat generation can be suppressed.
  • the second portion 1112 and the fourth portion 1122 are arc-shaped and do not have corners. For this reason, for example, the possibility of stress concentration occurring in the corners due to thermal expansion can be suppressed, and the durability of the busbar 11 can be improved.
  • the size of the vehicle 1 can be reduced.
  • the Hall element is applied as the magnetic detection element
  • the present invention is not limited to this. That is, as long as it is a magnetic detection element that can measure the magnetic flux generated by the flow of current, it can be widely applied to, for example, a magneto-impedance element, a magnetoresistive effect element, and the like.
  • the second portion 1112 in the first slit 111, is centered on the vertex on the upstream side of the first portion 1111 in the second direction D2 and on the side of the narrow portion 11n.
  • the fourth portion 1122 spans approximately 270° centered on the vertex of the third portion 1121 on the downstream side in the second direction D2, on the side of the narrow portion 11n.
  • the second portion 1112 has an arc shape extending approximately 180° around the narrow portion 11n side of the upstream side of the first portion 1111 in the second direction D2.
  • the fourth portion 1122 may have an arc shape extending approximately 180° around the narrow portion 11n side of the downstream side of the third portion 1121 in the second direction D2. good.
  • the second portion 1112 does not protrude toward the narrow portion 11n, and in the second slit 112, the fourth portion 1122 protrudes toward the narrow portion 11n.
  • the current flowing through the bus bar 11 largely bypasses the first slit 111 and the second slit 112, and is directed along the second direction D2 in the narrow width portion 11n (see the dashed line in the figure). Therefore, the detection accuracy can be improved without narrowing the narrow portion 11n more than necessary, so that the size of the current sensor device 7 can be reduced while suppressing heat generation.
  • the tip of the first portion 1111 in the direction opposite to the second direction D2 and the tip of the third portion 1121 is made to match, it is not limited to this.
  • the tip 111b of the second portion 1112 and the tip 112b of the fourth portion 1122 may be aligned when viewed from the first direction D1.
  • the current flowing through the bus bar 11 largely bypasses the first slit 111 and the second slit 112, and is directed along the second direction D2 in the narrow width portion 11n (see the dashed line in the figure).
  • the relative positions of the first slit 111 and the second slit 112 are the tip 111b of the first slit 111 and the second slit 111 when viewed from the first direction D1.
  • the tip 112 b is aligned, or at least a portion of the second portion 1112 overlaps the second slit 112 , or at least a portion of the fourth portion 1122 overlaps the first slit 111 .
  • the second portion 1112 has an arc shape extending approximately 180° around the narrow portion 11n side of the upstream side of the first portion 1111 in the second direction D2.
  • the fourth portion 1122 has an arc shape extending approximately 180° around the narrow portion 11n side of the downstream side of the third portion 1121 in the second direction D2. , but not limited to.
  • the second portion 1112 in the first slit 111, is positioned at approximately 180° centered on the opposite side of the narrow portion 11n of the upstream side of the first portion 1111 in the second direction D2. You may make it have circular arc shape which extends.
  • the fourth portion 1122 has an arc shape extending approximately 180° centering on the opposite side of the narrow portion 11n of the downstream side of the third portion 1121 in the second direction D2.
  • the current flowing through the bus bar 11 largely bypasses the first slit 111 and the second slit 112, and is directed along the second direction D2 in the narrow width portion 11n (see the dashed line in the figure). Therefore, the detection accuracy can be improved without narrowing the narrow portion 11n more than necessary, so that the size of the current sensor device 7 can be reduced while suppressing heat generation.
  • the second portion 1112 and the fourth portion 1122 are arc-shaped has been described, but the present invention is not limited to this.
  • the second portion 1112 and the fourth portion 1122 may have a square shape, or may have a substantially triangular shape with the tips 111b and 112b narrowed.
  • the configuration in which the first slit 111 is provided with the second portion 1112 and the second slit 112 is provided with the fourth portion 1122 has been described, but the present invention is not limited to this.
  • the first slit 111 is provided with the second portion 1112 and the second slit 112 is not provided with the fourth portion 1122, or the first slit 111 is not provided with the second portion 1112 and the second A fourth portion 1122 may be provided in the slit 112 .
  • the current flowing through the bus bar 11 can be reduced through the first slits 111 and the second slits 112 as compared with the case where the first slits 111 and the second slits 112 are not provided. can be diverted.
  • This current sensor device (7) is conductors (11, 12, 13); first magnetic detection elements (21a, 22a, 23a) and second magnetic detection elements (21b, 22b, 23b) for detecting magnetism generated by currents flowing through the conductors (11, 12, 13); A detection unit (21, 22, 23) and The conductors (11, 12, 13) are Wide width portions (11w, 12w, 13w) having a first width (w1) in a direction perpendicular to the first direction (D1) while allowing current to flow in the first direction (D1); A current flows in a second direction (D2) intersecting the first direction (D1), and a second width (w1) narrower than the first width (w1) in a direction orthogonal to the second direction (D2) w2), narrow portions (11n, 12n, 13n); It defines the first direction (D1) upstream side of the narrow portion (11n, 12n, 13n) and the second direction (D2) of the two side edges of the wide
  • first recesses (111, 121, 131) having a shape recessed in the direction opposite to the second direction (D2) with the downstream side edge as the base end (111a); It defines the first direction (D1) downstream side of the narrow portion (11n, 12n, 13n) and the second direction (D2) of the two side edges of the wide portion (11w, 12w, 13w).
  • the first magnetic detection elements (21a, 22a, 23a) and the second magnetic detection elements (21b, 22b, 23b) are arranged in the stacking direction (Dz) with respect to the surface of the narrow portions (11n, 12n, 13n).
  • the width of the first portion (1111) including the base end (111a) in the first direction (D1) is defined as a first recess width (w11)
  • the second The width in the first direction (D1) of the second portion (1112) including the tip (111b) in the direction opposite to the direction (D2) is defined as a second recess width (w12) smaller than the first recess width (w11).
  • the tip (111b) of the first recess (111, 121, 131) and the tip (112b) of the second recess (112, 122, 132) match.
  • the current flowing through the conductors (11, 12, 13) greatly bypasses the first recesses (111, 121, 131) and the second recesses (112, 122, 132). , the direction along the second direction (D2) in the narrow width portions (11n, 12n, 13n) (see the dashed line in FIG. 17).
  • the first magnetic detection elements (21a, 22a, 23a) and the second magnetic detection elements (21b, 22b, 23b) in the detection section (21, 22, 23) are arranged along the first direction (D1). Therefore, the magnetic flux density to be detected can be increased, the S/N ratio can be improved, and high detection accuracy can be obtained. Therefore, detection accuracy can be improved without narrowing the narrow portions (11n, 12n, 13n) more than necessary, so that the size of the current sensor device (7) can be reduced while suppressing heat generation.
  • the present current sensor device (7) In the second recess (112, 122, 132), the width in the first direction (D1) in the third portion including the base end (112a) is defined as the third recess width (w13), and the width in the second direction (D2 ) in the fourth portion (1122) including the tip (112b) of the first direction (D1) is set to a fourth recess width (w14) smaller than the third recess width (w13),
  • the tip (111b) of the first recess (111, 121, 131) and the tip (112b) of the second recess (112, 122, 132) match.
  • at least part of the fourth portion (1122) preferably overlaps the first recess (111, 121, 131).
  • the current flowing through the conductors (11, 12, 13) bypasses the first recesses (111, 121, 131) and the second recesses (112, 122, 132) to a greater extent.
  • the direction is along the second direction (D2) (see the dashed line in FIG. 17). Therefore, detection accuracy can be improved without narrowing the narrow portions (11n, 12n, 13n) more than necessary, so that the size of the current sensor device (7) can be reduced while suppressing heat generation.
  • the present current sensor device (7) It is preferable that the second portion (1112) has an arc-shaped outer shape.
  • the second portion (1112) has an arc shape and does not have corners. For this reason, for example, the possibility of stress concentration occurring in the corners due to thermal expansion can be suppressed, and the durability of the conductors (11, 12, 13) can be improved.
  • the present current sensor device (7) It is preferable that the first portion (1111) has a notched shape and the second portion (1112) is formed continuously at the tip of the first portion (1111).
  • the first recesses (111, 121, 131) and the second recesses (112, 122, 132) are formed by punching the conductors (11, 12, 13) once. can be formed, and the manufacturing process can be simplified.
  • the conductors (11, 12, 13) are connected between an inverter circuit (5) that operates a rotating electrical machine (2) that operates on a three-phase alternating current and any one of the three-phase coils of the rotating electrical machine (2).
  • the first magnetic detection elements (21a, 22a, 23a) and the second magnetic detection elements (21b, 22b, 23b) are preferably arranged along the first direction (D1).
  • the present current sensor device (7) is provided in the inverter circuit (5) of the rotary electric machine (2) mounted on the vehicle (1) and operated by a three-phase alternating current, thereby reducing the size of the vehicle (1). can be achieved.
  • the present disclosure can be industrially applied as a current sensor device for measuring current in an inverter device for a three-phase AC motor mounted on electric vehicles such as automobiles and trucks.
  • fourth Hall element fourth Hall element (fourth magnetic detecting element, second magnetic detecting element), 23... package (third detecting section, detecting section), 23a... third 5 Hall elements (fifth magnetic detection element, first magnetic detection element), 23b... 6th Hall element (sixth magnetic detection element, second magnetic detection element), 111, 121, 131... first slit (first concave portion ), 111a...base end, 111b...tip, 112, 122, 132...second slit (second recess), 112a...base end, 112b...tip, 1111...first portion, 1112...second portion, 1121...second 3 parts, 1122... fourth part, D1... first direction, D2... second direction, D3... third direction, D4... fourth direction, D5...
  • D6... sixth direction Dz... stacking direction (first stacking direction, second stacking direction, third stacking direction), S... space (first air layer, second air layer), w1... first width, w2... second width, w3... third width, w4 ... fourth width w5 ... fifth width w6 ... sixth width w11 ... first recess width w12 ... second recess width w13 ... third recess width w14 ... fourth recess width

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  • Physics & Mathematics (AREA)
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  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
PCT/JP2022/048040 2022-01-14 2022-12-26 電流センサ装置 Ceased WO2023136125A1 (ja)

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EP22920642.0A EP4407324A4 (en) 2022-01-14 2022-12-26 Electric current sensor device
US18/703,960 US20250231225A1 (en) 2022-01-14 2022-12-26 Electric current sensor device
CN202280082170.1A CN118382812A (zh) 2022-01-14 2022-12-26 电流传感器装置
JP2023573967A JPWO2023136125A1 (https=) 2022-01-14 2022-12-26

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