JP2022100597A - Current sensor - Google Patents

Abstract

To provide a current sensor capable of accurately measuring a current value.SOLUTION: A current sensor 1 includes at least two magnetoelectric conversion units 20 in which at least two magnetic detection elements 52 for detecting magnetic flux density of magnetic flux input to detection surfaces 53 mutually facing in the same direction are provided on at least two conductors 10, and which output a signal corresponding to a difference in the magnetic flux density of orthogonal components orthogonal to the detection surfaces 53 of the magnetic flux input to the detection surfaces 53 of at least respective two magnetic detection elements 52 are included. In at least respective two conductors 10, extension sections 30 that extend along a second direction orthogonal to a first direction and concave sections 40 that have orthogonal portions 41 extending along the first direction and are dented in the first direction to the extension sections 30 are provided, and at least respective two magnetoelectric conversion units 20 are provided in a state that the detection surfaces 53 face the respective orthogonal portions 41 of the concave sections 40 along a third direction orthogonal to both the first direction and the second direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a current sensor that detects a current flowing through a conductor.

Conventionally, when measuring the current flowing through a conductor, the magnetic flux density of the magnetic field generated around the conductor is detected by a magnetic detection element according to the current flowing through the conductor, and the magnetic flux density is applied to the conductor based on the detected magnetic flux density. The technique of calculating the current and finding it has been used. As a current sensor using such a technique, for example, there are those described in Patent Documents 1 and 2 whose sources are shown below.

Patent Document 1 discloses a current sensor. In this current sensor, the first bus bar to be measured for current, the second bus bar to be non-measured for current, the magnetically sensitive surface faces the side surface of the second bus bar, and the magnetic sensory surface is orthogonal to the side surface of the first bus bar. It is configured to include a magnetic-electric conversion element arranged in such a manner.

Patent Document 2 discloses a current sensor. This current sensor is configured to include two bus bars arranged in parallel with each other and each provided with a notch, and a magnetic-electric conversion element arranged in the notch of each bus bar.

Japanese Patent Application Laid-Open No. 2015-152418 Japanese Unexamined Patent Publication No. 2016-38203

In the technique described in Patent Document 1, a rectangular notch is provided in the bus bar, and a magnetic-electric conversion element is arranged in the notch. Since the cross-sectional area of the portion where the notch is provided is smaller than that of the other portions, the resistance value increases, and the calorific value in the portion where the notch is provided may increase. In addition, the magnetic-electric conversion element receives heat from the bus bar, and the detection result of the magnetic-electric conversion element includes temperature fluctuations, so that the current value may not be measured accurately.

In the technique described in Patent Document 2, the substrate on which the magnetic-electric conversion element is mounted is formed according to the notch. For this reason, the position where the magnetic-electric conversion element is provided is also determined according to the position of the notch, so that the size of the substrate becomes large (the length in the X direction in Patent Document 2 becomes long), which is a factor of increasing the cost of the substrate. Will be. Further, as in the technique described in Patent Document 1, there is a possibility that the current value cannot be measured accurately due to the increase in the calorific value due to the provision of the notch in the bus bar.

Therefore, a current sensor capable of measuring a current value with high accuracy is required.

The characteristic configuration of the current sensor according to the present invention has at least two conductors and a detection surface facing the same direction with respect to the conductor, and at least detects the magnetic flux density of the magnetic flux input to the detection surface. Two magnetic detection elements are provided, and a signal corresponding to the difference in the magnetic flux density of the orthogonal component orthogonal to the detection surface of the magnetic flux input to the detection surface of each of the at least two magnetic detection elements is output. It comprises at least two magnetic conversion units, and each of the at least two conductors extends along a second direction orthogonal to the first direction, which is the adjacent direction of the two conductors adjacent to each other. A portion and a concave portion having an orthogonal portion extending along the first direction and recessed in the first direction with respect to the extending portion are provided, and each of the at least two magnetic conversion units is provided with a concave portion. The detection surface is provided in a state of facing each of the orthogonal portions of the concave portion along a third direction orthogonal to both the first direction and the second direction.

With such a characteristic configuration, since the magnetic-electric conversion unit is provided so as to face the conductor along the third direction, the magnetic flux caused by the current flowing through the conductor can be transferred to the magnetic-electric conversion element without cutting out the conductor. It can be input to the detection surface. For this reason, in the conductor, the heat generated by the flow of the current does not concentrate in a predetermined place, so that it is possible to reduce the influence of the heat received from the conductor by the magnetic-electric conversion unit as compared with the configuration in which the conductor is cut out. It becomes. Therefore, it is possible to measure the current value with high accuracy.

Further, the concave portion is formed from the first bent portion extending along the first direction, the second bent portion extending from the first bent portion along the second direction, and the second bent portion. The electromagnetic conversion unit provided in the concave portion of one of the two conductors adjacent to each other and having a third bending portion extending along the first direction is the first along the third direction. When the magnetic electric conversion unit provided in the concave portion of the other of the two conductors adjacent to each other and facing one bent portion is provided in a state of facing the third bent portion along the third direction. Suitable.

With such a configuration, for example, the positions of the first curved portions of the conductors adjacent to each other are shifted from each other in the second direction, so that the magnetic electricity provided on one of the conductors adjacent to each other is provided. The conversion unit is placed close to the second curved portion of the other conductor of the adjacent conductors, and the magnetic-electric conversion unit provided on the other conductor of the adjacent conductors is installed in the adjacent conductors. It can be arranged so as to be close to the second curved portion of one of the conductors. This makes it possible to reduce the magnetic flux caused by the current flowing through the adjacent conductor, which is input from the direction orthogonal to the detection surface of the magnetic-electric conversion unit. Therefore, since the influence of the magnetic flux related to the magnetic flux density that is not the detection target can be reduced, the current value can be measured with high accuracy.

Further, the first bent portion of one of the two conductors adjacent to each other is offset toward the central portion along the second direction in the second bent portion of the other of the two conductors adjacent to each other. It is preferable to be provided with.

With such a configuration, it is possible to cancel the disturbance caused by other conductors adjacent to the conductor to be detected. Therefore, the magnetic flux density can be detected with high accuracy, and the current value can be measured with high accuracy. In addition, since the current sensor can be configured by the conductor and the magnetic / electric conversion unit without the need for a magnetic collecting core and a shield core, the current sensor that detects the current flowing through each of a plurality of conductors can be miniaturized and inexpensive. It can be realized by the configuration.

Further, the at least two conductors are three bus bars connected to a three-phase motor, and the three bus bars have the extension portions arranged in a line along the first direction. Suitable.

With such a configuration, it is possible to detect the three-phase current flowing through the three-phase motor with a small current sensor.

It is a development view of a current sensor. It is a top view of the current sensor. It is a side view of a current sensor. It is a figure which shows the detection surface of a magnetic electric conversion unit. It is a figure which shows an example of the magnetic flux density input to a detection surface. It is a block diagram of a magnetic-electric conversion unit. It is a figure which shows the current sensor which concerns on other embodiment.

The current sensor according to the present invention is compactly configured without using a core. Hereinafter, the current sensor 1 of the present embodiment will be described. Here, when a current flows through the conductor, a magnetic field is generated with the conductor as the axis according to the magnitude of the current (Ampere's right-handed screw rule). The current sensor 1 detects the magnetic flux density of the magnetic flux in such a magnetic field, and measures the current (current value) flowing through the conductor based on the detected magnetic flux density.

1 is a developed view of the current sensor 1, FIG. 2 is a plan view of the current sensor 1, and FIG. 3 is a side view of the current sensor 1. The current sensor 1 includes at least two conductors 10 and at least two magnetic / electric conversion units 20.

In this embodiment, it is assumed that at least two conductors 10 are three bus bars connected to a three-phase motor. More specifically, the conductor 10 electrically connects each of the three terminals of the three-phase motor and each of the three terminals of the inverter that controls the current flowing through the three-phase motor. Therefore, in the following, at least two conductors 10 will be described as three conductors 10, and when distinguishing each of the three conductors 10, they will be described as conductors 11, conductors 12, and conductors 13.

Each of the three conductors 10 is provided with an extending portion 30 and a concave portion 40. The extending portion 30 extends along a second direction orthogonal to the first direction, which is an adjacent direction of two conductors 10 adjacent to each other. The two conductors 10 adjacent to each other are two conductors 10 of the conductor 11 and the conductor 12 adjacent to each other, and two conductors 10 of the conductor 12 and the conductor 13 adjacent to each other. The direction in which the conductor 11 and the conductor 12 are adjacent to each other and the direction in which the conductor 11 and the conductor 12 are adjacent to each other correspond to the adjacent directions, and the X direction in FIGS. 1 to 3 corresponds to the adjacent direction.

In the present embodiment, such an adjacent direction is referred to as a first direction. The second direction is a direction orthogonal to this first direction, and in this embodiment, the Y direction in FIGS. 1 to 3 corresponds to the direction.

The concave portion 40 has an orthogonal portion 41 extending along the first direction and is configured to be recessed in the first direction with respect to the extending portion 30. In this embodiment, the first direction is the X direction. The concave portion 40 is provided with an orthogonal portion 41 so as to extend along the X direction. Therefore, the extending portion 30 and the orthogonal portion 41 are configured in a state of being orthogonal to each other as shown in FIG. 2, and the concave portion 40 is recessed in the X direction with respect to the extending portion 30 via the orthogonal portion 41. It is configured to exhibit an orthogonal shape. In the present embodiment, the concave portions 40 of the conductor 11, the conductor 12, and the conductor 13 are all recessed to the same side along the X direction.

Here, in the present embodiment, the concave portion 40 has a U-shape so that the Z-direction view is shown in FIG. 2 (in the present embodiment, the concave portion 40 has two corners on the bottom side opposite to the U-shaped opening portion. It is formed with a shape). Therefore, one concave portion 40 is configured to have two orthogonal portions 41 facing each other and one bottom portion 42 sandwiched between the two orthogonal portions 41. For ease of understanding, in the following, when distinguishing each of the two orthogonal portions 41, one of the two orthogonal portions will be referred to as an orthogonal portion 41A, and the other will be referred to as an orthogonal portion 41B. In the present embodiment, of the two orthogonal portions 41 facing each other, one orthogonal portion 41A corresponds to a first bent portion extending along the first direction, and the bottom portion 42 is the first from the first bent portion. Of the two orthogonal portions 41 facing each other, the other orthogonal portion 41B corresponds to the second bent portion extending along the two directions, and the third orthogonal portion 41B extends from the second bent portion along the first direction. Corresponds to the bent part.

Here, in the present embodiment, the conductor 11, the conductor 12, and the conductor 13 are provided with their respective extending portions 30 arranged in a row along the first direction as shown in FIGS. 1 to 3. Aligning in a row along the first direction means that the extending portions 30 are arranged so as to be parallel to each other and have overlapping portions in the X-direction view.

At least two magnetic / electric conversion units 20 are provided in each of the conductors 10. In the present embodiment, the conductor 10 is composed of three conductors 11, a conductor 12, a conductor 12, and a conductor 13. Since the magnetic / electric conversion unit 20 is provided separately for each of the conductors 10, that is, the conductor 11, the conductor 12, and the conductor 13, the current sensor 1 is provided with three magnetic / electric conversion units 20. Therefore, in the present embodiment, at least two magnetic / electric conversion units 20 are described as three magnetic / electric conversion units 20, and when distinguishing each of the three magnetic / electric conversion units 20, the magnetic / electric conversion corresponding to the conductor 11. The unit 21, the magnetic / electric conversion unit 22 corresponding to the conductor 12, and the magnetic / electric conversion unit 23 corresponding to the conductor 13 will be described.

In the present embodiment, the magnetic-electric conversion unit 20 is provided with two magnetic detection elements 52. The magnetic detection element 52 is a device having a function of detecting the magnetic flux density of the magnetic flux, and corresponds to, for example, a Hall element. In the present embodiment, the magnetic / electric conversion unit 20 is configured by including two magnetic detection elements 52 in a resin package 51 having a plurality of electrodes 50 as shown in FIG.

Each of the two magnetic detection elements 52 has a detection surface 53 into which a magnetic flux corresponding to the magnetic flux density to be detected described above is input. The two magnetic detection elements 52 are arranged so that the detection surfaces 53 face each other in the same direction. The detection surface 53 in the present embodiment does not indicate a surface in space, but merely indicates a functional portion for detecting the magnetic flux density, that is, a detection portion. Therefore, the detection surface 53 may be read as a detection portion.

Here, when a current flows through the conductor 10, a magnetic field is generated around the conductor 10 according to the magnitude of the current. The magnetic detection element 52 detects the magnetic flux density of the magnetic flux in such a magnetic field. Further, as shown in FIG. 3, each of the three magnetic / electric conversion units 20 has an orthogonal portion of each of the concave portions 40 along a third direction in which the detection surface 53 is orthogonal to both the first direction and the second direction. It is provided so as to face the 41. In the present embodiment, the first direction is the X direction and the second direction is the Y direction. Therefore, the third direction corresponds to the Z direction in FIGS. 1 to 3. Therefore, each of the three magnetic / electric conversion units 20 is provided with the two detection surfaces 53 arranged side by side in the first direction. Further, in the present embodiment, the distance from each of the two detection surfaces 53 of the magnetic / electric conversion unit 21 provided on the conductor 11 to the orthogonal portion 41 of the conductor 11 and the two detection surfaces of the magnetic / electric conversion unit 22 provided on the conductor 12. Here, the distances from each of the 53 to the orthogonal portion 41 in the conductor 12 and the distances from each of the two detection surfaces 53 of the magnetic electric conversion unit 23 provided in the conductor 13 to the orthogonal portion 41 in the conductor 13 are equal to each other. However, it is not limited to this.

In the present embodiment, the magnetic electric conversion unit 20 provided in one concave portion 40 of the two conductors 10 adjacent to each other faces the first bending portion along the third direction, and the two conductors 10 adjacent to each other face each other. The magnetic-electric conversion unit 20 provided in the other concave portion 40 of the above is provided in a state of facing the third bent portion along the third direction. One of the two conductors 10 facing each other is, for example, a conductor 11, and the magnetic / electric conversion unit 20 provided in the concave portion 40 of one of the two conductors 10 adjacent to each other is a magnetic / electric conversion unit 21. “Facing the first bent portion along the third direction” means that the conductor 11 has a predetermined distance along the Z direction with respect to the orthogonal portion 41A in the concave portion 40 of the conductor 11, and the orthogonal portion 41A and the orthogonal portion 41A. It means facing each other. Further, the other of the two conductors 10 adjacent to each other is, for example, the conductor 12, and the magnetic / electric conversion unit 20 provided in the concave portion 40 of one of the two conductors 10 adjacent to each other is the magnetic / electric conversion unit 22. be. “Opposite the third bent portion along the third direction” means that the conductor 12 has a predetermined distance along the Z direction with respect to the orthogonal portion 41B in the concave portion 40 of the conductor 12, and the orthogonal portion 41B and the orthogonal portion 41B. It means facing each other.

Therefore, as shown in FIG. 2, the magnetic-electric conversion unit 21 provided in the concave portion 40 of the conductor 11 has a predetermined interval along the Z direction with respect to the orthogonal portion 41A in the concave portion 40 of the conductor 11. The magnetic-electric conversion unit 22 provided in a state of facing the orthogonal portion 41A and provided in the concave portion 40 of the conductor 12 is predetermined along the Z direction with respect to the orthogonal portion 41B in the concave portion 40 of the conductor 12. It is provided with a gap so as to face the orthogonal portion 41B. Similarly, the magnetic electric conversion unit 23 provided in the concave portion 40 of the conductor 13 has a predetermined distance along the Z direction with respect to the orthogonal portion 41A in the concave portion 40 of the conductor 13, and is in contact with the orthogonal portion 41A. It is provided in a state of facing each other.

For example, when a current flows through the conductor 10 in the direction indicated by the arrow in FIG. 5, a magnetic flux in the direction indicated by the broken line is generated in the orthogonal portion 41 facing the magnetic-electric conversion unit 20. Therefore, a magnetic flux in the direction from the orthogonal portion 41 toward the detection surface 53 is input to the detection surface 53 of one of the two magnetic detection elements 52, and of the two magnetic detection elements 52. A magnetic flux in a direction from the detection surface 53 toward the orthogonal portion 41 is input to the detection surface 53 of the other magnetic detection element 52.

The two magnetic detection elements 52 detect the magnetic flux density of an orthogonal component orthogonal to the detection surface 53 among the magnetic fluxes input to the detection surfaces 53 of the two magnetic detection elements 52. That is, the two magnetic detection elements 52 detect the magnetic flux density of the magnetic flux in the direction along the Z direction in FIG.

Here, in the present embodiment, the directions of the orthogonal components of the magnetic flux input to the detection surfaces 53 of the two magnetic detection elements 52 are opposite to each other. Therefore, the magnetic-electric conversion unit 20 is configured to output a signal corresponding to the difference in the magnetic flux density of the orthogonal components of the magnetic flux input to the two detection surfaces 53. Specifically, in the magnetic-electric conversion unit 20, two magnetic detection elements 52 are wired as shown in FIG. That is, the detection results of the two magnetic detection elements 52 are input to the inverting terminal and the non-inverting terminal of the amplifier AMP1, and the differential magnetic flux is detected. Further, this differential magnetic flux is amplified by the amplifier AMP2 in the subsequent stage and output as a signal of the magnetic-electric conversion unit 20. This makes it possible for the magnetic-electric conversion unit 20 to detect the magnetic flux density of the magnetic flux generated by the current flowing through the orthogonal portion 41.

Further, in the present embodiment, as shown in FIG. 2, the first bending portion of one of the two conductors 10 adjacent to each other is the second direction in the other second bending portion of the two conductors 10 adjacent to each other. It is provided in an offset state toward the center along the line. The first bent portion of one of the two conductors 10 adjacent to each other is the orthogonal portion 41A of the conductor 11. The other second bent portion of the two conductors 10 adjacent to each other is the bottom portion 42 of the conductor 12. The second direction is the Y direction. Therefore, the orthogonal portion 41A of the conductor 11 is provided in a state of being offset toward the central portion side of the bottom portion 42 of the conductor 12 along the Y direction. In the present embodiment, the orthogonal portion 41A of the conductor 11 is offset to the central portion of the bottom portion 42 of the conductor 12 along the Y direction, that is, the central portion of the bottom portion 42 of the conductor 12 along the Y direction along the X direction. It is provided so that the orthogonal portion 41A of the conductor 11 is located on the extended line. This makes it possible to dispose the magnetic-electric conversion unit 21 provided so as to face the orthogonal portion 41A of the conductor 11 along the Z direction in an offset state at the central portion of the bottom portion 42 of the conductor 12 along the Y direction. ..

Similarly, the orthogonal portion 41A of the conductor 13 is offset to the central portion of the bottom portion 42 of the conductor 12 along the Y direction, that is, the central portion of the bottom portion 42 of the conductor 12 along the Y direction is extended along the X direction. It is provided so that the orthogonal portion 41A of the conductor 11 is located on the line. This makes it possible to dispose the magnetic-electric conversion unit 23 provided facing the orthogonal portion 41A of the conductor 13 along the Z direction in an offset state at the central portion of the bottom portion 42 of the conductor 12 along the Y direction. ..

Further, as shown in FIG. 2, a magnetic electric conversion unit 21 is provided facing the orthogonal portion 41A of the conductor 11 along the Z direction, and is provided facing the orthogonal portion 41A of the conductor 13 along the Z direction. The magnetic-electric conversion unit 23 is provided in a state of being arranged in a line along the X direction. Therefore, the magnetic-electric conversion unit 21, the magnetic-electric conversion unit 22, and the magnetic-electric conversion unit 23 are arranged in a staggered manner along the X direction, shifting the positions in the Y direction every other time.

In the present embodiment, for example, the magnetic field caused by the current flowing through the orthogonal portion 41A of the conductor 12 and the magnetic field caused by the current flowing through the orthogonal portion 41B are mutually magnetized in the direction in which the magnetic electric conversion unit 21 arranged on the conductor 11 is magnetized. The magnetic field caused by the current flowing through the bottom 42 of the conductor 12 is canceled out, and the magnetic field is detected by the two magnetic detection elements 52 in the magnetic conversion unit 21 in the same direction and the same value as each other. When 21 takes a differential, the combined magnetic field becomes zero. Therefore, it is possible to reduce the influence of the current flowing through the conductor 12 on the measurement result of the magnetic-electric conversion unit 21. Further, the influence of the magnetic field generated from the conductor 13 on the magnetic-electric conversion unit 21 is set so that the distance between the magnetic-electric conversion unit 21 and the conductor 13 is wide, and the influence is small. Therefore, the influence of the current flowing through the conductor 13 can be ignored on the measurement result of the magnetic-electric conversion unit 21.

In the present embodiment, as shown in FIG. 1, the magnetic-electric conversion unit 20 is mounted on one substrate 60 on the same surface as each other. In the present embodiment, when the substrate 60 is fixed to the housing 2 described later, the substrate 60 is mounted on the surface of the substrate 60 facing the housing 2 (note that the housing 2 is omitted in FIGS. 2 and 3). ). As shown in FIG. 1, in the conductor 10, the concave portion 40 is housed in the housing 2 with the extending portion 30 protruding. It is preferable that the housing 2 is configured to support the concave portion 40 by, for example, resin molding. A notch 2B is formed on the surface 2A orthogonal to the Z direction of the housing 2 in FIG. 1, and when the substrate 60 is fixed to the housing 2, the magnetic electric conversion unit 20 is housed in the notch 2B. This makes it possible to prevent interference between the housing 2 and the magnetic / electric conversion unit 20. The substrate 60 can be fastened and fixed to the housing 2 via bolts 61.

As described above, according to the current sensor 1, by mounting the magnetic / electric conversion unit 20 provided on each of the concave portions 40 of the three conductors 10 on one substrate 60, the magnetic / electric conversion unit for the concave portion 40 can be easily obtained. 20 can be positioned and can be placed at the desired position. Further, since the current sensor 1 can be configured from the conductor 10 and the magnetic / electric conversion unit 20, the size can be reduced.

[Other embodiments]
In the above embodiment, the case where the number of conductors 10 is three has been described, but the number of conductors 10 may be two or four or more. In any case, it is possible to detect the current flowing through the conductor 10 without providing the magnetic core.

In the above embodiment, the case where at least two conductors 10 are three bus bars connected to the three-phase motor has been described, but at least two conductors 10 are connected to the three-phase motor. It may be other than the three bus bars. Further, when at least two conductors 10 are three bus bars connected to a three-phase motor, the three bus bars do not have to have the extension portions 30 arranged in a line along the first direction. good. Further, as shown in FIG. 7, a configuration in which four or more bus bars (six bus bars in FIG. 7) are arranged may be used.

In the above embodiment, an example in which the magnetic-electric conversion unit 20 is mounted on the substrate 60 has been given, but the substrate 60 is a substrate (for example, of a three-phase motor) on which a control IC or the like for controlling the drive of a three-phase motor is mounted. It can also be used in combination with the ECU board that controls the drive).

In the above embodiment, the concave portion 40 has been described as having two corners on the bottom side opposite to the U-shaped opening portion in the Z-direction view, but the concave portion 40 has a Z-direction view. May be U-shaped with the bottom side curved.

Further, in the above embodiment, the concave portion 40 is formed from the first bent portion extending along the first direction and the second bent portion extending along the second direction from the first bent portion and the second bent portion. Although it has been described as having a third bent portion extending along the first direction, the concave portion 40 is configured to include a portion other than the first bent portion, the second bent portion, and the third bent portion. Is also possible. That is, for example, the concave portion 40 may be formed in a polygonal shape such as a pentagon instead of a square shape in the Z direction.

In the above embodiment, it has been described that the magnetic-electric conversion unit 20 is provided with two magnetic detection elements 52, but it is preferable that the magnetic-electric conversion unit 20 is provided with at least two magnetic detection elements 52. That is, the magnetic / electric conversion unit 20 may be provided with three or more magnetic detection elements 52, and in such a case, each of the magnetic / electric conversion units 20 is a magnetic / electric conversion unit of at least two magnetic detection elements 52 (that is, a magnetic / electric conversion unit). It is preferable to output a signal corresponding to the difference in the magnetic flux density of the orthogonal component orthogonal to the detection surface 53 of the magnetic flux input to the detection surface 53 of all the magnetic detection elements 52 provided in each of the 20.

In the above embodiment, the magnetoelectric conversion unit 20 provided in one concave portion 40 of the two conductors 10 adjacent to each other faces the first bending portion along the third direction, and the two conductors 10 adjacent to each other. The magnetic / electric conversion unit 20 provided in the other concave portion 40 of the above is described as being provided in a state of facing the third bent portion along the third direction, but one concave portion of two conductors 10 adjacent to each other is provided. The magnetic / electric conversion unit 20 provided in the 40 faces the third bent portion along the third direction, and the magnetic / electric conversion unit 20 provided in the other concave portion 40 of the two conductors 10 adjacent to each other is in the third direction. It may be provided so as to face the second bent portion along the above.

In the above embodiment, the first bent portion of one of the two conductors 10 adjacent to each other is offset toward the center portion along the second direction of the other second bent portion of the two conductors 10 adjacent to each other. However, the first bending portion of one of the two conductors 10 adjacent to each other is located on the central portion side along the second direction of the other second bending portion of the two conductors 10 adjacent to each other. It does not have to be provided in an offset state.

The present invention can be used in a current sensor that detects a current flowing through a conductor.

1: Current sensor 10: Conductor 20: Magnetic and electrical conversion unit 30: Extension part 40: Concave part 41: Orthogonal part 52: Magnetic detection element 53: Detection surface

Claims (4)

With at least two conductors,
The conductor has detection surfaces facing in the same direction, and at least two magnetic detection elements for detecting the magnetic flux density of the magnetic flux input to the detection surface are provided, and each of the at least two magnetic detection elements is provided. The magnetic flux is input to the detection surface of the above, and the magnetic flux density is orthogonal to the detection surface of the magnetic flux density.
Each of the at least two conductors has an extension portion extending along a second direction orthogonal to the first direction, which is an adjacent direction of the two conductors adjacent to each other, and an extension portion extending along the first direction. It has an orthogonal portion to be projected, and is provided with a concave portion recessed in the first direction with respect to the extending portion.
Each of the at least two magnetic / electrical conversion units is provided in a state where the detection surface faces each of the orthogonal portions of the concave portion along a third direction orthogonal to both the first direction and the second direction. Current sensor. The concave portion includes a first bending portion extending along the first direction, a second bending portion extending along the second direction from the first bending portion, and the first bending portion extending from the second bending portion. It has a third bend that extends along the direction and
The magnetic conversion unit provided in the concave portion of one of the two conductors adjacent to each other faces the first bending portion along the third direction, and the other of the two conductors adjacent to each other. The current sensor according to claim 1, wherein the magnetic electric conversion unit provided in the concave portion is provided in a state of facing the third bent portion along the third direction. The first bent portion of one of the two conductors adjacent to each other is provided in a state of being offset toward the central portion along the second direction in the second bent portion of the other of the two conductors adjacent to each other. The current sensor according to claim 2. The at least two conductors are three bus bars connected to a three-phase motor, and the three bus bars have the extension portions arranged in a line along the first direction. The current sensor according to any one of 3 to 3.

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