JP2016125907A - Current sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for realizing a current sensor with high measuring accuracy including a magnetoelectric transducer.SOLUTION: A current sensor comprises bus bars 2b and 2c provided with notches 21b and 21c, magnetoelectric transducers 34b and 34c disposed at the notches 21b and 21c, a magnetic shield plate 32, and a resin mold body 31. The magnetic shield plate 32 is arranged so as to sandwich the magnetoelectric transducers 34b and 34c with the bus bars 2b and 2c, respectively. The resin mold body 31 molds the magnetoelectric transducers 34b and 34c and the magnetic shield plate 32 with insulating resin. Slits 38b and 38c are provided in the resin mold body 31. The slits 38b and 38c fit in the bus bars, respectively and a portion forming a straight line with the slits of the resin mold body 31 fits in the notches 21b and 21c.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a current sensor. In particular, the present invention relates to a current sensor that measures a current flowing through each of a plurality of bus bars.

  A current sensor that measures current may be required. For example, in order to control a motor of an electric vehicle, a current sensor is attached to a bus bar that transmits power to the motor. In order to control the motor with high accuracy, it is desired to improve the measurement accuracy of the current sensor.

  In the current sensor, as an element used for measuring a current, for example, there is a magnetoelectric conversion element. The magnetoelectric conversion element is an element that senses a magnetic flux generated due to a current flowing through the bus bar and converts it into a voltage signal. For example, Patent Document 1 discloses a technique for improving the measurement accuracy of a current sensor having such a magnetoelectric conversion element. When a plurality of bus bars are arranged in parallel and the current of each bus bar is measured, the magnetic field generated from the non-measurement bus bar arranged side by side with the measurement target bus bar causes noise of the magnetoelectric transducer. . In patent document 1, the influence of the magnetic field used as a noise is suppressed by devising the shape of the bus bar used as a measurement object, and the shape of the bus bar which is not a measurement object, and the layout of these bus bars and the magnetoelectric conversion element. The measurement accuracy is improved.

JP 2001-074783 A

  In order to improve the measurement accuracy of the current sensor that measures the current flowing through each of the plurality of bus bars, it is also effective to accurately position the magnetoelectric conversion element in addition to noise countermeasures as disclosed in Patent Document 1. The present specification relates to a current sensor that measures a current flowing through each of a plurality of bus bars, and provides a technique that easily balances noise countermeasures and positioning of a magnetoelectric conversion element. In addition, since the current sensor disclosed in the present specification is also characterized by the shape of the bus bar, the characteristic shape of the bus bar is included in the configuration of the current sensor.

  In the following description, “two bus bars” will be described as an example as a representative of “a plurality of bus bars”. That is, hereinafter, a current sensor that measures the current flowing through each of the two bus bars will be described. This is to make the invention easier to understand. It should be noted that the technique described below is not limited to two bus bars, but can be applied to a current sensor that measures a current flowing through each of three or more bus bars.

  The current sensor disclosed in this specification includes two bus bars arranged in parallel, each bus bar having a notch, and a magnetoelectric device arranged in the notch of each bus bar. A conversion element, a magnetic shield plate, and a resin mold body are provided. The magnetic shield plate is disposed so as to sandwich the magnetoelectric conversion element between each bus bar. In the resin mold body, the magnetoelectric conversion element and the magnetic shield plate are molded with an insulating resin. And at least a part of the notch of each bus bar is arranged so as not to overlap with the notch of the adjacent bus bar along the bus bar extending direction, and the magnetoelectric conversion element is arranged at “at least part” thereof. ing. Furthermore, the slit corresponding to each bus bar is provided in the resin mold body along the bus bar extending direction. A slit is fitted to each bus bar, and a portion that is aligned with the slit of the resin mold body is fitted to the notch.

  According to this configuration, the cross-sectional area of the bus bar is reduced by the notch, and the current density at the portion is increased. Hereinafter, a part having a smaller cross-sectional area than the other part due to the notch is referred to as a narrow part. Since the strength of the magnetic field induced by the current is proportional to the current density, the magnetic field generated by the narrow bus bar is stronger than the magnetic field generated by other parts of the bus bar. The magnetoelectric transducer arranged in the notch measures the magnetic field strengthened by the notch. On the other hand, at least a part of each bus bar notch is arranged so as not to overlap with a notch of an adjacent bus bar along the bus bar extending direction, and each magnetoelectric conversion element is arranged at “at least part” thereof. ing. That is, since the magnetoelectric conversion element does not overlap with the notch of the adjacent bus bar in the bus bar extending direction, the magnetic field generated by the narrow portion of the adjacent bus bar does not greatly affect the magnetoelectric conversion element. Further, the current sensor includes a magnetic shield plate. By this magnetic shield plate, the magnetoelectric transducer is shielded from an external noise magnetic field. Due to the above effects, the current sensor is improved in noise resistance.

  On the other hand, in the above current sensor, the magnetic shield plate and the magnetoelectric conversion element are covered with a resin mold. The resin mold body is fitted to each bus bar at a portion that is aligned with the slit and the slit. Since the magnetic shield plate and the magnetoelectric conversion element are covered with the insulating resin of the resin mold body, they are completely insulated from the bus bar. Furthermore, this resin mold body not only accurately determines the relative position of the two bus bars, but also accurately determines the relative positions of the bus bar, the magnetoelectric transducer and the magnetic shield plate. Accurate determination of the relative position between the bus bar and the magnetoelectric conversion element contributes to the improvement of the measurement accuracy of the magnetic field measured by the magnetoelectric conversion element. Further, the accurate determination of the relative position of the two bus bars and the relative position of the magnetic shield plate contributes to noise countermeasures. By providing the resin mold body described above, the current sensor disclosed in this specification can achieve both noise countermeasures and positioning of the magnetoelectric conversion element with a simple structure.

  According to the technology disclosed in this specification, a current sensor having good measurement accuracy can be easily realized in a current sensor that measures current in each of a plurality of bus bars. Details and further improvements of the technology disclosed in this specification will be described in the following “DETAILED DESCRIPTION”.

It is a perspective view of the current sensor of an example. It is a perspective view which shows only a bus bar. It is a top view of a current sensor. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG.

  A current sensor according to an embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a current sensor 200 according to the embodiment. The current sensor 200 includes three bus bars 2a, 2b, 2c arranged in parallel, a sensor unit 3 arranged above the bus bars 2a, 2b, 2c, and a lower side of the bus bars 2a, 2b, 2c. A shield unit 4 is provided. In the present specification, the bus bars 2a, 2b, and 2c may be collectively referred to as a bus bar 2. Since the current sensor 200 disclosed in the present specification is also characterized by the shape of the bus bar 2, the bus bar 2 having a characteristic shape is included in the configuration of the current sensor. It should be noted that a part of the bus bar 2 that extends long is shown in the figure. Current sensor 200 is provided inside an inverter mounted on an electric vehicle. The inverter is a device for converting the electric power of the battery into electric power suitable for supplying the driving motor. The inverter is provided with an output terminal connected to the motor. The current sensor 200 is provided in a part of the bus bar that connects the output terminal and the inverter circuit built in the inverter. The traveling motor is a three-phase AC motor, and the inverter outputs a three-phase AC. Therefore, the output terminal and the inverter circuit are connected by the three bus bars 2. In an electric vehicle, in order to drive the motor with the required torque, current feedback control of the motor is executed. The current value measured by the current sensor 200 is used to calculate a control amount for current feedback control. In the present specification, an XYZ coordinate system is shown in the figure, and in this specification, the configuration of the embodiment will be described using the XYZ coordinate system as appropriate. The X axis coincides with the extending direction of the bus bar 2. The Z-axis positive direction indicates the upper side, and the Z-axis negative direction indicates the lower side.

  As shown in FIG. 1, the sensor unit 3 is fitted into notches 21 a, 21 b, and 21 c provided on the upper side of the bus bar 2. The sensor unit 3 includes three magnetoelectric conversion elements 34a, 34b, and 34c on the inner side. Although details will be described later, when the sensor unit 3 is fitted into the notches 21a, 21b, and 21c, the respective magnetoelectric transducers 34a, 34b, and 34c are positioned inside the notches 21a, 21b, and 21c. . Hereinafter, when the magnetoelectric conversion elements 34a, 34b, and 34c are shown without distinction, they are referred to as magnetoelectric conversion elements 34. The shield unit 4 is fitted into notches 22a, 22b, and 22c (notched in FIG. 1; see FIG. 2) provided on the lower side of the bus bar 2, respectively.

  The configuration of the bus bar 2 will be described with reference to FIG. FIG. 2 is a perspective view showing only the bus bar 2 with the sensor unit 3 and the shield unit 4 removed from the current sensor 200. A large current flows through the motor of the electric vehicle. Therefore, a bus bar made of an elongated metal plate is adopted so as to reduce the internal resistance. As shown in FIG. 2, the bus bar 2 is an elongated metal plate. The bus bars 2a, 2b, 2c are arranged in parallel so that the wide side faces thereof. Further, the bus bars 2a, 2b, 2c are arranged so that the narrow side surfaces thereof are aligned in the vertical direction (Z-axis direction). The bus bars 2a, 2b, 2c have the same thickness.

  As shown in FIG. 2, each of the bus bars 2a, 2b, 2c is provided with rectangular cutouts 21a, 21b, 21c and rectangular cutouts 22a, 22b, 22c. The notches 21a, 21b, and 21c have the same shape, and the notches 22a, 22b, and 22c have the same shape. In the bus bar 2a, the notch 21a is located above the bus bar 2a, and the notch 22a is located below the bus bar 2a. The notch 21a and the notch 22a are arranged at the same position in the extending direction of the bus bar 2a (that is, the X-axis direction). The other bus bars 2b and 2c are also provided with notches 21b and 22c and notches 22b and 22c in the same positional relationship as the bus bar 2a.

  The notches 21a, 21b, and 21c are arranged in a V shape when viewed from above (that is, when viewed from the Z-axis direction). In other words, the notch 21a of the bus bar 2a is arranged so as not to overlap the notch 21b of the bus bar 2b adjacent to the bus bar 2a along the extending direction. Similarly, the notch 21b of the bus bar 2b is arranged so as not to overlap the notch 21c of the bus bar 2c adjacent to the bus bar 2b along the extending direction.

  The configuration of the sensor unit 3 will be described with reference to FIG. FIG. 3 is a plan view when the current sensor 200 is viewed from above (that is, when viewed from the Z-axis direction). The sensor unit 3 is configured by molding three magnetoelectric conversion elements 34a, 34b, 34c, a substrate 33 to which the magnetoelectric conversion element 34 is connected, and a shield plate 32 with an insulating resin by injection molding. The Hereinafter, the insulating resin covering the magnetoelectric conversion element 34, the substrate 33, and the shield plate 32 is referred to as a resin mold body 31. The resin mold body 31 covers the entire periphery of the magnetoelectric conversion element 34, the substrate 33, and the shield plate 32. In other words, the magnetoelectric conversion element 34, the substrate 33, and the shield plate 32 are embedded inside the resin mold body 31. The outer shape of the sensor unit 3, that is, the outer shape of the resin mold body 31, is a flat plate shape. As shown in FIG. 3, the sensor unit 3 is disposed on the bus bar 2, and the resin mold body 31 includes a notch 38a corresponding to the bus bar 2a and a slit 38b corresponding to each of the bus bars 2b and 2c. , 38c are provided. The notch 38a and the slits 38b and 38c penetrate from the upper surface to the lower surface of the resin mold body 31, and also penetrate the substrate 33 and the shield plate 32 provided inside the resin mold body 31. The slits 38b and 38c are rectangles that are long in the bus bar extending direction (that is, the X-axis direction) and have the same shape. As shown in FIG. 3, the notch 38 a is provided on the side surface of the resin mold body 31 on the X axis negative direction side. The slit 38 b extends from the side surface of the resin mold body 31 on the X axis positive direction side, and the slit 38 c extends from the side surface of the resin mold body 31 on the X axis negative direction side. That is, the notch 38a and the slits 38b and 38c are arranged in a V shape. In other words, the fitting portion 39a which is a portion aligned with the extending direction of the notch 38a and the bus bar and the fitting portions 39b and 39c which are portions which are aligned with the slits 38b and 38c are arranged in a V shape. . The fitting portions 39a, 39b, 39c arranged in the V shape are fitted into the notches 21a, 21b, 21c of the bus bar 2 similarly arranged in the V shape, so that the sensor unit 3 is attached to the bus bar 2. It is attached. At this time, the slits 38b and 38c are fitted to the corresponding bus bars 2b and 2c.

  The magnetoelectric conversion element detects a magnetic field caused by a current flowing through the bus bar and outputs a voltage signal corresponding to the magnetic flux density of the magnetic field. As shown in FIG. 3, the magnetoelectric conversion element 34a is disposed inside the fitting portion 39a. By fitting the fitting portion 39a into the notch 21a, the magnetoelectric conversion element 34a is disposed inside the notch 21a. Thereby, the magnetoelectric conversion element 34a is provided so as to face the bus bar 2a, and the magnetic field caused by the current flowing through the bus bar 2a is detected by the magnetoelectric conversion element 34a. Similarly, the magnetoelectric conversion elements 34b and 34c are also arranged inside the fitting portions 39b and 39c, respectively. By fitting the fitting portions 39b and 39c into the cutouts 21b and 21c, the magnetoelectric conversion elements 34b and 34c are arranged inside the cutouts 21b and 21c. Magnetic fields caused by currents flowing through the bus bars 2b and 2c are detected by the magnetoelectric conversion elements 34b and 34c, respectively.

  As shown in FIG. 3, an output terminal 35 is provided at the end of the sensor unit 3 in the arrangement direction of the bus bars 2. The output terminal 35 is connected to the substrate 33. The voltage signal output from the magnetoelectric conversion element 34 is output from the output terminal 35 to the outside of the sensor unit 3 via the substrate 33.

  The sensor unit 3 will be further described with reference to FIGS. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. The line IV-IV in FIG. 3 shows a cross section parallel to the bus bar 2b and passing through the magnetoelectric conversion element 34b. The VV line in FIG. 3 is a cross section orthogonal to the extending direction of the bus bar, and shows a cross section that passes through the magnetoelectric transducer 34b. As shown in FIGS. 4 and 5, the magnetoelectric conversion element 34 b is covered with a resin mold body 31. A substrate 33 is located on the magnetoelectric conversion element 34 b, and a shield plate 32 is located on the substrate 33. The substrate 33 and the shield plate 32 are also covered with the resin mold body 31. An electrode (not shown) is exposed on the upper surface of the magnetoelectric conversion element 34 b, and the electrode is connected to the substrate 33. The shield plate 32 is made of a material with high magnetic permeability. A magnetic field that is noise generated from other electronic components generated outside the shield plate 32 (for example, an electronic component provided in the inverter circuit) is collected by the shield plate 32. Therefore, the magnetoelectric conversion element 34 b is shielded from a magnetic field that becomes noise generated outside the shield plate 32. As described above, the resin mold body 31 is formed by injection molding. Therefore, the magnetoelectric conversion element 34, the substrate 33, and the shield plate 32 are in close contact with the resin mold body 31.

  As shown in FIG. 4, the fitting part 39b of the resin mold body 31 is fitted in the notch 21b. One side surface 23 of the notch 21b is provided with a taper to facilitate fitting of the fitting portion 39b. Corresponding to this taper, one side surface of the fitting part 39b is also inclined. The lower surface of the fitting portion 39b is in contact with the bottom surface 24 of the notch 21b. Resin mold in which the distance between the magnetoelectric conversion element 34b and the bottom surface 24 of the notch 21b is located between the magnetoelectric conversion element 34b and the bottom surface 24 by the lower surface of the fitting portion 39b contacting the bottom surface 24 of the notch 21b It is defined by the thickness L1 of the body 31.

  The above-described structure is the same for the fitting portions 39a and 39c that fit into the notches 21a and 21c and the magnetoelectric conversion elements 34a and 34c that are positioned inside the fitting portions 39a and 39c.

  The shield unit 4 will be described with reference to FIGS. As shown in FIGS. 4 and 5, the shield unit 4 is configured by molding the entire periphery of the shield plate 42 with an insulating resin. The insulating resin that covers the periphery of the shield plate 42 is referred to as a resin mold body 41. The shield unit 4 has the same shape as the sensor unit 3. The shield unit 4 is also provided with a slit arranged in the same manner as the sensor unit 3, and the shield unit 4 is fitted into the notches 22 a, 22 b, 22 c on the lower side of the bus bar 2 in the same manner as the sensor unit 3. Yes. The shield unit 4 can block the magnetoelectric conversion element from a magnetic field that becomes noise generated outside the shield unit 4. That is, when the magnetoelectric conversion element 34 is sandwiched between the shield plate 32 of the sensor unit 3 and the shield plate 42 of the shield unit 4, the magnetoelectric conversion element 34 is prevented from a magnetic field that becomes noise generated above and below the current sensor 200. Blocked.

  The effect of the current sensor 200 shown in the embodiment will be described. Hereinafter, the magnetoelectric conversion element 34b will be described as a representative. As shown in FIG. 4, by providing a notch 21b and a notch 22b, a portion (narrow portion) having a smaller cross-sectional area than the notched portion of the bus bar 2b between the notch 21b and the notch 22b. WN) is formed. The current density of the current passing through the narrow portion WN is higher than the current density of the current passing through the portion where the bus bar 2b is not cut. By increasing the current density by the narrow portion WN, the magnetic flux density of the magnetic flux generated around the narrow portion WN is also increased. Since the magnetoelectric conversion element 34b senses the increased magnetic flux density, the magnetoelectric conversion element 34b is less susceptible to the influence of magnetic fields (for example, magnetic fields generated from other electronic components and adjacent bus bars). Therefore, the magnetoelectric conversion element 34b can detect the magnetic flux density of the magnetic flux generated by the current passing through the bus bar 2b with high accuracy.

  Moreover, the fitting part 39b of the resin mold body 31 fits into the notch 21b of the bus bar 2b, whereby the magnetoelectric conversion element 34b can be accurately positioned with respect to the bus bar 2b. Furthermore, in order to obtain better accuracy, it is desirable to define the distance between the magnetoelectric conversion element 34b and the bus bar 2b to a desired distance and to bring the magnetoelectric conversion element 34b as close as possible to the bus bar 2b. According to the above-described configuration, the interval between the magnetoelectric transducer 34b and the bus bar 2b can be easily defined by bringing the lower surface of the resin mold body 31 into contact with the bottom surface of the notch 21b. Further, the interval can be easily adjusted by the thickness L1 of the resin mold body 31. Moreover, since the resin mold body 31 is an insulator, the insulation between the magnetoelectric conversion element 34b and the bus bar 2b can be ensured.

  Further, as described above, the notch 21b provided in the bus bar 2b of the current sensor 200 does not overlap with the notches 21a and 21c provided in the adjacent bus bars 2a and 2c along the extending direction of the bus bar. Are arranged as follows. According to such a configuration, similarly, the magnetic field generated by the current passing through the narrow portions of the bus bars 2a and 2c does not significantly affect the magnetoelectric conversion element 34b disposed in the notch 21b of the bus bar 2b. . Similarly, the magnetic field generated by the current passing through the narrow portion of the bus bar 2b does not significantly affect the magnetoelectric conversion elements 34a and 34c arranged in the notches 21a and 21c of the bus bars 2a and 2c.

  Further, as described above, the shield plate 32 is molded integrally with the magnetoelectric conversion element 34 by being molded by injection molding so as to be covered with the resin mold body 31. Therefore, the resin mold body 31 is fitted into each notch of the bus bar 2 so that the shield plate 32 and the magnetoelectric conversion element 34 can be positioned together on the bus bar.

  The sensor unit 3 (resin mold body 31) and the two bus bars 2b and 2c are combined as follows. That is, the slits 38b and 38c provided in the resin mold body 31 are fitted to the corresponding bus bars 2b and 2c, respectively, and the fitting portions 39b and 39c that are aligned with the slits 38b and 38c, respectively. The bus bar is notched with the notches 21b and 21c. The adjacent two bus bars 2b and 2c are fitted into the slits 38b and 38c of the resin mold body 31, so that their relative positions are accurately determined. Accurate determination of the relative positions of adjacent bus bars also contributes to improvement in measurement accuracy of the magnetoelectric transducers 34b and 34c. The resin mold body 31 also accurately determines the relative position of the bus bar 2a with respect to the bus bars 2b and 2c. The resin mold body 31 accurately determines the relative positions of the bus bars 2 arranged in parallel and the magnetoelectric conversion elements 34 and the shield plates 32 corresponding to the bus bars.

  Further, the current sensor 200 of the embodiment also has the following characteristics. The lengths of the slits 38b and 38c provided in the sensor unit 3 in the bus bar extending direction (that is, the X-axis direction) are the same. And the length of the extension direction of the site | part (fitting part 39b, 39c) which forms each slit 38b, 38c and a straight line is also the same. Further, the length of the fitting portion 39a in the extending direction is also the same as the length of the fitting portions 39b and 39c in the extending direction. Here, the length in the extending direction of the fitting portions 39a, 39b, and 39c is designed to be the same as the length in the extending direction of each of the notches 21a, 21b, and 21c of each bus bar of the bus bar 2. Note that “same” is not exactly the same, but an expression that takes into account fitting tolerances. According to such a configuration, one side surface in the extending direction of the fitting portion 39a contacts the side surface of the notch 21a. Each of the one side surfaces of the fitting portions 39b and 39c in the extending direction also comes into contact with the corresponding side surfaces of the notches 21b and 21c. Therefore, when the sensor unit 3 is fitted into the notches 21a, 21b, and 21c of the bus bar 2, the relative positions of the bus bars 2a, 2b, and 2c arranged in parallel in the extending direction (that is, the X-axis direction) are set. It can be fixed accurately. As described above, since the relative position in the extending direction of the bus bars arranged in parallel is accurately determined, it is possible to reduce the decrease in measurement accuracy due to the mounting error. Therefore, improvement in measurement accuracy of the current sensor 200 is expected.

  The current sensor 200 according to the embodiment having the above-described features can improve measurement accuracy by synergistic effect of the following effects. (1) The magnetic field generated from the bus bar to be measured is strengthened by the notch. (2) Since the magnetoelectric transducer does not overlap with the notch of the adjacent non-measurement bus bar along the bus bar extending direction, it is difficult to be affected by the magnetic field generated by the narrow portion of the adjacent bus bar. (3) The shield plate shields the magnetoelectric conversion element from a magnetic field that becomes external noise. (4) Since the insulator for fixing the magnetoelectric conversion element is fitted into the notch, the positioning of the magnetoelectric conversion element with respect to the bus bar can be realized with high accuracy. (5) The insulator fitted into the notch accurately determines the relative position of the plurality of bus bars.

  Hereinafter, points to be noted regarding the technology shown in the embodiments will be described. The number of bus bars shown in the embodiments is merely an example, and the technology disclosed in this specification can be used without being limited to the number of bus bars.

  Further, in the current sensor of the embodiment, the notches of the adjacent bus bars do not overlap in the bus bar extending direction. In the technology of the embodiment, the magnetoelectric conversion element that measures the current of one bus bar may not overlap with the notch of the adjacent bus bar along the extending direction of the bus bar. In that sense, the notches of the two bus bars arranged in parallel may partially overlap. In other words, in two parallel bus bars, at least part of the notch of one bus bar does not overlap with the notch of the adjacent bus bar, and the current of one bus bar is measured at “at least part” thereof. The magnetoelectric conversion element may be arranged.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2 (2a, 2b, 2c): Bus bar 3: Sensor unit 4: Shield unit 21a, 21b, 21c: Notch (upper side)
22a, 22b, 22c: Notch (lower side)
31: Resin mold body 32: Shield plate 33: Substrate 34 (34a, 34b, 34c): Magnetoelectric conversion element 35: Output terminal 38a: Notch 38b, 38c: Slit 39a, 39b, 39c: Fitting part 41: Resin mold Body 42: Shield plate 200: Current sensor

Claims (1)

Two bus bars arranged in parallel, each bus bar having a notch, and
A magnetoelectric transducer disposed in the notch of each bus bar;
A magnetic shield plate disposed so as to sandwich the magnetoelectric conversion element between each bus bar; and
A resin mold body in which the magnetoelectric conversion element and the magnetic shield plate are molded with an insulating resin;
With
At least a part of the notches of each bus bar is arranged so as not to overlap the notches of the adjacent bus bars along the bus bar extending direction,
The magnetoelectric conversion element is disposed in the at least part,
The resin mold body is provided with a slit corresponding to each bus bar along the bus bar extending direction,
The slit is fitted to each bus bar, and the portion that is aligned with the slit of the resin mold body is fitted to the notch,
A current sensor characterized by that.

Images