JP2013002948A - Current sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp type current sensor which can be attached to an electric wire to be measured later, and has good measuring accuracy, to a conventional current sensor which cannot sufficiently obtain measuring accuracy due to an assembling error or changes over time after installation.SOLUTION: A current sensor includes a supporting body disposed so as to surround an outer edge of the electric wire to be measured; a housing provided so as to couple to the supporting body; a plurality of magnetic sensors disposed on the supporting body; and a flexible substrate on which the magnetic sensors are mounted. The supporting body is composed of a body side supporting body and a hinge portion side supporting body. A first abutting portion is provided along an outer periphery of the body side supporting body, and a second abutting portion is provided along an outer periphery of the hinge portion side supporting body. When the body side supporting body and the hinge portion side supporting body are opened, the flexible substrate separates a part of the first abutting portion and a part of the second abutting portion, and when the body side supporting body and the hinge portion side supporting body are closed, the flexible substrate contacts with the first abutting portion and the second abutting portion.

Description

  The present invention relates to a current sensor that detects a current flowing through a wire to be measured, and more particularly to a clamp-type current sensor for detecting a current from a magnetic sensor.

  In order to control and monitor various devices, a current sensor that is attached to an existing wire to be measured later is well known. As this type of current sensor, it is known to use a magnetic sensor using a coil or a Hall element that senses a magnetic field generated from the current flowing through the wire to be measured. A plurality of them may be used to reduce the influence from the

  As the above-described conventional technique, Patent Document 1 proposes a disconnection detection device having an inspection unit 803 in which a plurality of Hall elements 809 are arranged so that a current sensor can be attached to an existing wire to be measured later. FIG. 11 shows an example of the inspection unit 803 of the disconnection detection apparatus which is the first conventional example. As shown in FIG. 11, the inspection unit 803 includes a hinge portion 808 that joins a guide rail for moving the inspection unit 803 along the wire to be measured, and a pair of semicircular portions 812 (812a, 812a, 812b) and a plurality of Hall elements 809 arranged in a pair of semicircular portions 812. And this test | inspection part 803 passes an existing to-be-measured electric wire (not shown) in the hollow part 814 of a pair of semicircle part 812 in which the annular shape was formed by dividing | segmenting a pair of semicircle part 812. The disconnection of the wire to be measured can be detected.

  In Patent Document 2, as shown in FIG. 12, a head-divided current sensor 900 using a magnetic sensor using a plurality of saturable coils 911 is proposed. The head-divided current sensor 900 according to the conventional example 2 includes a detection head 910 (L1) having two saturable coils 911 (S1, S2) arranged in a case 912 and two possible sensors arranged in a holder 915. And a plurality of saturable coils 911 (S1, S2, S3, S4) are concentrically arranged when the holder 915 is attached to the case 912. The detection head 914 (L2) includes the saturation coils 911 (S3, S4). It arrange | positions with respect to the center of the to-be-measured electric wire 916 so that it may arrange in equal intervals. The head-divided current sensor 900 sandwiches the wire to be measured 916 between the case 912 and the holder 915, so that the current can be detected without cutting the existing wire to be measured 916, and the pair of detection heads (910 914), the external parallel magnetic field due to geomagnetism or the like can be canceled and only the magnetic field due to current can be detected.

JP 2002-228700 A JP 2001-153895 A

  However, in Conventional Example 1, when attaching the inspection unit 803 having the plurality of Hall elements 809 to the existing wire to be measured, the pair of semicircular portions 812 are divided, so that the plurality of Hall elements 809 are separated from each other. Since it will be arrange | positioned at a circle | round | yen part (812a and 812b) and it attaches, the position shift | offset | difference of Hall elements 809 will arise by the assembly | attachment error and the time-dependent change after attachment. When current measurement is performed on an existing wire under test using a plurality of magnetic sensors with such a configuration, even if a slight positional deviation between the magnetic sensors greatly affects the measurement accuracy, the measurement accuracy is poor. It could only be used for disconnection detection where measurement accuracy was not required.

  Also, in the conventional example 2, since the plurality of saturable coils 911 are arranged in the divided case 912 and the holder 915, as in the conventional example 1, after installation, the assembly error and the time elapsed after the attachment. Due to the change, positional deviation between the plurality of saturable coils 911 (S1, S2, S3, S4) occurs. Further, in the conventional example 2, since the existing measured wire 916 is sandwiched between the case 912 and the holder 915, when the outer diameter of the measured wire 916 is small, many saturable coils 911 cannot be arranged, and the measurement accuracy is high. There was also a problem that could not be obtained sufficiently.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a clamp-type current sensor that can be attached to a wire to be measured later and has high measurement accuracy.

  In order to solve this problem, a current sensor according to claim 1 of the present invention includes a support body disposed so as to surround an outer edge of an electric wire to be measured, a housing provided in connection with the support body, A plurality of magnetic sensors arranged on a support, wherein the magnetic sensor detects magnetism generated when a current flows through the wire to be measured, wherein the housing is a body-side housing And a hinge side housing having a hinge side shaft that overlaps a main body side shaft provided in the main body side housing, and the support body is provided by being connected to the main body side housing. A main body side support body and the hinge part side support body, the main body side shaft and the hinge part side. The main body side support is provided with a first groove. In addition, the hinge part side support body is provided with a second groove, and the main body side support body and the hinge part side support body of the first groove and the second groove are closed. Forming a part of the inner periphery of the support body surrounding the outer edge of the wire to be measured, and a part of the outer periphery of the support body by the main body side support body and the hinge part side support body A first abutting portion is provided along the outer periphery of the main body side support, and a second abutting portion is provided along the outer periphery of the hinge portion side support, and the main body side shaft and The hinge part side shaft is provided between the inner periphery of the support and the outer periphery of the support in a plan view from the axial direction of the main body side shaft and the hinge part side shaft, and the magnetic sensor Is mounted on a flexible substrate, and has a first fixing portion that fixes the flexible substrate and the first contact portion, and the flexible substrate In the state where the main body side support and the hinge part side support are closed, the flexible substrate has the second fixing part for fixing the second contact part. In a state where the main body side support body and the hinge part side support body are in contact with the contact section and the second contact section, the flexible substrate is one of the first contact sections. And a part of the second contact part.

  The current sensor according to claim 2 of the present invention is a plan view of the support body in a state where the main body side support body and the hinge part side support body are closed, and the first contact section and the first Virtual shapes connecting the two contact portions are regular polygons, and the magnetic sensor includes the first contact portions and the second contact portions forming the regular polygons. It is characterized by being arranged on each side.

  The current sensor according to claim 3 of the present invention is characterized in that the regular polygon is a regular octagon and the number of the magnetic sensors is eight.

  The current sensor according to claim 4 of the present invention is characterized in that the magnetic sensor has a flat bottom surface in contact with the flexible substrate.

  In the current sensor according to claim 5 of the present invention, the first fixing part is provided in the vicinity of the opening / closing side of the main body side support, and the second fixing is provided in the vicinity of the opening / closing side of the hinge part side support. And both ends of the flexible substrate are fixed to the first contact portion and the second contact portion by the first fixing portion and the second fixing portion. .

  According to a sixth aspect of the present invention, there is provided a current sensor comprising: a first end surface formed on the opening / closing side of the main body side support; and a second end surface formed on the opening / closing side of the hinge portion side support. The main body side support body and the hinge part side support body are disposed so as to face each other, and a concave portion is provided on one of the first end surface and the second end surface, and a convex portion is provided on the other end. In the closed state, the convex portion is strongly fitted into the concave portion, and the main body side support body and the hinge portion side support body are fixed.

  According to the first aspect of the present invention, the current sensor of the present invention is provided with the main body side shaft and the hinge portion side shaft on the inner side of the flexible substrate. When the main body side support body and the hinge part side support body are opened, the flexible substrate is bent so that the flexible substrate is separated from a part of the first contact part and a part of the second contact part. When the main body side support body and the hinge part side support body are closed, a force in a direction extending to the flexible substrate is applied, and the flexible substrate contacts the first contact portion and the second contact portion. It becomes like this. Accordingly, a plurality of magnetic sensors mounted on the flexible substrate can be arranged with high accuracy with respect to the wire to be measured without applying stress due to bending or the like to the flexible substrate. Accordingly, it is possible to provide a clamp-type current sensor that can be attached to the wire to be measured later and has high measurement accuracy.

  According to a second aspect of the present invention, in the current sensor of the present invention, the plurality of magnetic sensors are arranged on each side of the first contact portion and the second contact portion forming a regular polygon. Thus, the adjacent magnetic sensors can be arranged at equal angles with respect to the wire to be measured. Thus, by adding the detection values of the respective magnetic sensors, it is possible to make it difficult to reduce the measurement accuracy even if the position of the wire under measurement is somewhat shifted.

  According to the third aspect of the present invention, in the current sensor of the present invention, eight magnetic sensors are arranged on each side of the first contact portion and the second contact portion forming a regular octagon. Therefore, the magnetic sensors can be provided at positions where the adjacent magnetic sensors are at an equal angle with respect to the wire to be measured and at opposite positions. As a result, by adding the detection values of the respective magnetic sensors, it is possible to make it difficult to reduce the measurement accuracy even if the position of the wire under measurement is slightly displaced, and the difference between the detection values of the opposing magnetic sensors. , The influence of the external magnetic field can be offset, and the influence from the external magnetic field can be easily reduced.

  According to the fourth aspect of the present invention, since the bottom surface of the magnetic sensor in contact with the flexible substrate is a flat surface, the bottom surface of each of the plurality of magnetic sensors, the first contact portion, and the first 2 comes into contact with each other through a flexible substrate. Thereby, the accuracy of the position of the magnetic sensor and the accuracy of the arrangement angle of the magnetic sensor can be increased, and the measurement accuracy can be increased.

  According to the invention of claim 5, the current sensor of the present invention is provided in the vicinity of the first fixing part provided in the vicinity of the opening / closing side of the main body side support and the opening / closing side of the hinge part side support. Since both ends of the flexible substrate are fixed to the first contact portion and the second contact portion by the second fixing portion, a portion where the flexible substrate is deformed when opened is elongated. . This can prevent stress from concentrating on a part of the flexible substrate and extend the life of the current sensor.

  According to the invention of claim 6, the current sensor according to the present invention is provided in any one of the recesses provided on either the first end face of the main body side support body or the second end face of the hinge side support body. Since the convex portion provided on the other side is strongly fitted and the main body side support body and the hinge part side support body are fixed, the support body can be easily closed with a simple mechanism. As a result, it is easy to assemble and the manufacturing cost can be reduced.

  Therefore, the current sensor of the present invention can be attached to the wire to be measured later, and can provide a clamp-type current sensor with high measurement accuracy.

It is an exploded perspective view explaining the current sensor of a 1st embodiment of the present invention. It is a perspective view explaining the current sensor of a 1st embodiment of the present invention. It is a perspective view explaining the current sensor of a 1st embodiment of the present invention, and is a figure which omitted a cover. FIG. 4 is a perspective view for explaining the current sensor according to the first embodiment of the present invention, and is a view showing a state in which the support body in the perspective view shown in FIG. 3 is opened. It is the perspective view explaining the current sensor of 1st Embodiment of this invention, Comprising: It is the figure which looked at the perspective view shown in FIG. 4 from another angle. It is a figure explaining the current sensor of 1st Embodiment of this invention, Comprising: Fig.6 (a) is a perspective view of a housing | casing and a support body, FIG.6 (b) is shown to Fig.6 (a). It is the bottom view seen from the Z2 side. 7A and 7B are diagrams illustrating the current sensor according to the first embodiment of the present invention, in which FIG. 7A is a top view as viewed from the Z1 side illustrated in FIG. 3, and FIG. 7B is illustrated in FIG. It is the bottom view seen from the Z2 side. It is a figure explaining the current sensor of 1st Embodiment of this invention, Comprising: Fig.8 (a) is an enlarged view of P part shown in FIG.7 (b), FIG.8 (b) is a support body. It is an enlarged view of the same part when opened. It is a block diagram explaining the modification 2 of the current sensor of 1st Embodiment of this invention, Comprising: Fig.9 (a) is a perspective view of an example which changed the shape of the support body, Comprising: FIG.9 (b) These are bottom views seen from the Z2 side shown in FIG. It is a block diagram explaining the modification 3 of the current sensor of 1st Embodiment of this invention, Comprising: Fig.10 (a) is a perspective view of an example which changed the shape of the support body, Comprising: FIG.10 (b) These are the bottom views seen from the Z2 side shown to Fig.10 (a). It is sectional drawing which shows an example of the test | inspection part of the disconnection detection apparatus in the prior art example 1. FIG. It is a block diagram which shows an example of the head division | segmentation type current sensor in the prior art example 2. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is an exploded perspective view illustrating a current sensor 101 according to the first embodiment of the present invention. FIG. 2 is a perspective view illustrating the current sensor 101 according to the first embodiment of the present invention. FIG. 3 is a perspective view for explaining the current sensor 101 according to the first embodiment of the present invention, in which the cover K1 is omitted. FIG. 4 is a perspective view for explaining the current sensor 101 according to the first embodiment of the present invention, and shows a state in which the support 2 in the perspective view shown in FIG. 3 is opened. FIG. 5 is a perspective view for explaining the current sensor 101 according to the first embodiment of the present invention, and is a view of the perspective view shown in FIG. 4 viewed from another angle. FIG. 6 is a diagram for explaining the current sensor 101 according to the first embodiment of the present invention. FIG. 6A is a perspective view of the housing 1 and the support body 2, and FIG. It is the bottom view seen from the Z2 side shown to Fig.6 (a). FIG. 7 is a diagram for explaining the current sensor 101 according to the first embodiment of the present invention. FIG. 7A is a top view seen from the Z1 side shown in FIG. 3, and FIG. FIG. 4 is a bottom view seen from the Z2 side shown in FIG. 3. FIG. 8 is a diagram for explaining the current sensor 101 according to the first embodiment of the present invention. FIG. 8A is an enlarged view of a portion P shown in FIG. 7B, and FIG. These are the enlarged views of the same part when the support body 2 opens.

  As shown in FIGS. 1 and 2, the current sensor 101 according to the first embodiment of the present invention is provided so as to be connected to the support body 2 and the support body 2 that are arranged so as to surround the outer edge of the electric wire CA to be measured. And a plurality of magnetic sensors 3 disposed on the support 2 and a flexible substrate 5 on which the magnetic sensors 3 are mounted, and when a current flows through the measured electric wire CA. The generated magnetism is detected by the magnetic sensor 3. In addition, it includes a control board 9 on which an IC (not shown) is mounted and a cover K1 for covering and protecting the control board 9 and the magnetic sensor 3.

  As shown in FIGS. 1 and 2, the housing 1 is composed of a main body side housing 11 formed in a box shape, and a main body side housing 11 and a hinge part side housing 51 hinged. Then, the main body side housing 11 and the hinge portion side housing 51 are combined so that the main body side shaft HJ provided on the main body side housing 11 and the hinge portion side axis TJ provided on the hinge portion side housing 51 overlap. Using a rotation shaft body 99 such as a screw, the rotation shaft (main body side shaft HJ and hinge portion side shaft TJ) can be rotated. The main body side housing 11 houses a control board 9 that receives electric signals from the magnetic sensor 3 and performs processing. The control board 9 is connected to a take-out terminal (not shown) of the flexible board 5. Connected.

  As shown in FIGS. 1 and 2, the cover K1 includes a main body side cover K11 formed in a box shape and a hinge portion side cover K51 formed in a semi-cylindrical shape. The main body side cover K11 and the hinge part side cover K51 are attached to the main body side casing 11 and the hinge part side casing 51, for example, using a snap-in mechanism.

  The casing 1 and the cover K1 use synthetic resin materials such as ABS (acrylonitrile butadiene styrene), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), and LCP (liquid crystal polymer). Since a synthetic resin material is used, it can be easily manufactured by injection molding or the like.

  As shown in FIGS. 1, 4, and 6, the support body 2 is provided by being connected to a main body side support body 12 that is provided by being connected to the main body side case 11 and a hinge part side case 51. The hinge part side support body 52 is comprised. And the main body side support body 12 and the hinge part side support body 52 rotate centering on the main body side axis | shaft HJ and the hinge part side axis | shaft TJ which were provided in an overlapping manner, and the support body 2 can be opened and closed. .

  Further, since the support body 2 is formed integrally with the housing 1 and uses a synthetic resin material, each of the main body side support body 12 and the hinge part side support body 52 is provided on the main body side housing 11. And the hinge side housing 51 can be manufactured simultaneously by injection molding or the like. In addition, although the support body 2 is suitably formed integrally with the housing | casing 1, it may be produced separately.

  Further, as shown in FIGS. 6B, 7B and 8, the main body side support body 12 is provided with a first groove 12m, and the hinge part side support body 52 has a second groove. The first groove 12m and the second groove 52m face each other with the main body side support body 12 and the hinge part side support body 52 closed (shown in FIG. 6B). And forms the inner periphery of the support 2 that surrounds the outer edge of the wire CA to be measured. Further, the main body side support body 12 and the hinge part side support body 52 form most of the outer periphery of the support body 2, and the main body side support body 12 and the hinge part side support body 52 are closed. In a state of being in a state, it has a substantially cylindrical shape. Further, the main body side support body 12 and the hinge part side support body 52 are rotatable about a rotation axis (the main body side axis HJ and the hinge part side axis TJ) and can be opened and closed. When viewed in plan from the axial direction of the hinge side shaft TJ, a rotation shaft (a main body side axis HJ and a hinge side axis TJ) is provided between the inner periphery of the support 2 and the outer periphery of the support 2. .

  In addition, as shown in FIG. 6B, the main body side support 12 is provided with five first contact portions 12 t along the outer periphery of the main body side support 12. Are provided with three second contact portions 52 t along the outer periphery of the hinge-side support body 52. In the first contact portion 12t and the second contact portion 52t, the flexible substrate 5 described later is disposed along the outer periphery of the main body side support body 12 and the hinge portion side support body 52, and the flexible substrate 5 comes into contact with each other (see FIGS. 7B and 8A). At this time, the rotation shafts (main body side shaft HJ and hinge portion side shaft TJ) are positioned inside the flexible substrate 5.

  In addition, as shown in FIGS. 6B, 7B, and 8, the support body 2 is viewed in plan with the main body side support body 12 and the hinge part side support body 52 closed, and the first The first contact where the virtual shape connecting the contact portion 12t and the second contact portion 52t is a regular polygon, and the eight magnetic sensors 3 form a regular octagon. It arrange | positions at each edge | side of the part 12t and the 2nd contact part 52t. For this reason, as shown to Fig.8 (a), the magnetic sensor 3 can be each provided in the position which the angle of the adjacent magnetic sensors 3 is equiangular with respect to the to-be-measured electric wire CA, respectively. Thus, by adding the detection values of the respective magnetic sensors 3, even if the position of the electric wire CA to be measured is slightly shifted, it is possible to make it difficult to reduce the measurement accuracy.

  Further, as shown in FIGS. 3, 6 and 7B, the main body side support 12 has two convex first fixing portions 12k on the first contact portion 12t. The flexible substrate 5 is fixed to the first contact portion 12t by inserting and fitting the first fixing portion 12k into a through hole 15t (shown in FIG. 1) of the flexible substrate 5 described later. . Similarly, the hinge-side support body 52 has two convex second fixing portions 52k on the second contact portion 52t, and the second fixing portion 52k is a flexible substrate described later. The flexible substrate 5 is fixed to the second contact portion 52t by being inserted into and fitted into the through hole 55t (shown in FIG. 1). The first fixing portion 12k is provided in the first contact portion 12t in the vicinity of the open / close side of the main body side support body 12, and the second fixing portion 52k is a hinge portion side support body. 52 is provided at the second contact portion 52t in the vicinity of the opening / closing side.

  As shown in FIGS. 4 and 5, the main body side support 12 has a first end surface 12 p formed on the opening and closing side of the main body side support 12, and the hinge part side support 52 has a hinge part side support. A second end face 52p is formed on the open / close side of 52, and the first end face 12p and the second end face 52p are arranged to face each other. The first end surface 12p is provided with a convex portion 24t protruding in a convex shape, and the second end surface 52p is provided with a concave portion 24r recessed in a cylindrical shape. When the main body side support body 12 and the hinge part side support body 52 are closed, the convex part 24t and the convex part 24t are strongly fitted to the concave part 24r so that the main body side support body 12 and the hinge part side support are supported. The body 52 is fixed. For this reason, the support body 2 can be easily closed with a simple mechanism, and the assembly at the time of manufacture becomes easy.

  Further, as shown in FIGS. 4 and 5, a convex portion 14 t protruding in a convex shape is provided on the open / close side surface of the main body side housing 11, and the open / close side of the hinge side housing 51 is provided. A concave portion 14r recessed in a cylindrical shape is provided on the surface. When the main body side support body 12 and the hinge part side support body 52 are closed, the convex part 14t is strongly fitted to the concave part 14r so that the main body side support body 12 and the hinge part side support are supported. The body 52 is more strongly fixed. For this reason, the support body 2 can be more strongly closed easily with a simple mechanism, and the release of the support body 2 due to external stress or the like during manufacture or use can be prevented.

  The magnetic sensor 3 is a current sensor that detects magnetism generated when a current flows through the measured electric wire CA. For example, the magnetic sensor 3 is called a GMR (Giant Magneto Resistive) element using a giant magnetoresistive effect. ) Is used. In the magnetic sensor 3, a GMR element is produced on a silicon substrate, and the cut GMR chip is packaged with a thermosetting synthetic resin. The magnetic sensor 3 is mounted on a flexible substrate 5 and has a sensitivity axis (sensing magnetism) of the GMR element in the circumferential tangential direction DE with respect to the central axis AC of the inner periphery of the support 2 shown in FIG. (Direction to do).

  Further, the bottom surface of the packaging surface of the magnetic sensor 3 is made flat, and as shown in FIG. 7B and FIG. The first contact portion 12t of the body 12 and the second contact portion 52t of the hinge-side support body 52 and each of the plurality of magnetic sensors 3 are opposed to each other through the flexible substrate 5, Come into contact. Thereby, the position accuracy of the magnetic sensor 3 and the accuracy of the arrangement angle of the magnetic sensor 3 can be increased, and the measurement accuracy can be increased.

  Further, as shown in FIG. 8A, the plurality of magnetic sensors 3 are a plurality of magnetic sensors in a plan view of the support 2 with the main body side support 12 and the hinge part side support 52 closed. 3 are arranged on concentric circles, and the adjacent magnetic sensors 3 are arranged so that the angles thereof are equal to the center of the concentric circles. For this reason, by adding the detection values of the respective magnetic sensors 3, it is possible to make it difficult to reduce the measurement accuracy even if the position of the measured wire CA is slightly shifted.

  Further, as shown in FIG. 8A, there are eight (even number) magnetic sensors 3, and the two magnetic sensors 3 are closed with the main body side support body 12 and the hinge part side support body 52 closed. The support 2 is provided in a position facing the central axis AC of the support 2 in plan view. For this reason, by comparing the difference in detection value between the opposing magnetic sensors 3, the influence of the external magnetic field can be offset, and the influence of the external magnetic field can be easily reduced. The accuracy of the magnetic sensor 3 increases as the number of magnetic sensors 3 increases, but the current sensor increases in size and the manufacturing cost increases. From the performance and size of the magnetic sensor 3 used this time, about eight is the best, relatively better accuracy can be obtained, and the increase in size and cost of the current sensor can be suppressed. In order to reduce the influence of the external magnetic field, it is preferable to arrange an even number of magnetic sensors 3 at an equal angle. However, if the magnetic sensors 3 are arranged at an equal angle, the output of all the magnetic sensors is summed even with an odd number. The effect of the external magnetic field is offset.

  The flexible substrate 5 is a commonly used flexible printed wiring board (FPC), and a metal foil such as copper (Cu) provided on a film substrate of a material such as polyimide resin (PI), It is patterned so as to obtain a desired wiring pattern. A plurality of magnetic sensors 3 are arranged on the flexible substrate 5 such that the plurality of magnetic sensors 3 are arranged at the positions of the first contact portion 12 t and the second contact portion 52 t of the support 2. Are implemented at predetermined intervals. As a result, the position accuracy of the magnetic sensor 3 with respect to the measured wire CA is improved as compared with the case where the substrate on which the sensor is mounted as in the conventional example is divided and attached to the existing measured wire CA. be able to.

  In the current sensor 101 configured as described above, the main body side axis HJ and the hinge part side axis TJ are provided on the inner side of the flexible substrate 5, so that as shown in FIG. In a state where the support body 12 and the hinge part side support body 52 are closed, the flexible substrate 5 bends and the flexible substrate 5 comes into contact with the first contact portion 12t and the second contact portion 52t. As shown in FIG. 8B, in the state where the main body side support body 12 and the hinge part side support body 52 are opened, a force in the direction extending to the flexible substrate 5 is applied, and the flexible substrate 5 It is separated from a part of the first contact part 12t and a part of the second contact part 52t. Accordingly, the plurality of magnetic sensors 3 mounted on the flexible substrate 5 can be arranged with high accuracy with respect to the measured electric wire CA without applying stress due to bending or the like to the flexible substrate 5. Therefore, it is possible to provide a clamp-type current sensor 101 with high measurement accuracy that can be attached to the measured wire CA later.

  Further, the current sensor 101 of the present invention is provided with a first fixing portion 12k in the vicinity of the opening and closing side of the main body side support 12, and the first fixing portion 12k is inserted into the through hole 15t of the flexible substrate 5. And a second fixing portion 52k is provided in the vicinity of the opening / closing side of the hinge portion side support body 52, and the second fixing portion 52k is inserted into the through hole 55t of the flexible substrate 5 to be fitted. Thus, both ends of the flexible substrate 5 are fixed to the first contact portion 12t and the second contact portion 52t. As a result, as shown in FIG. 8A and FIG. 8B, the portion where the flexible substrate 5 is deformed when opened is lengthened, and stress is concentrated on a part of the flexible substrate 5. Can be prevented.

  As described above, since the main body side shaft HJ and the hinge portion side shaft TJ are provided on the inner side of the flexible substrate 5, the current sensor 101 of the present invention is for mounting the current sensor 101 on the measured wire CA. When the main body side support body 12 and the hinge part side support body 52 are opened, the flexible substrate 5 is bent, and the flexible substrate 5 is part of the first contact portion 12t and the second contact portion 52t. When the main body side support body 12 and the hinge part side support body 52 are closed, a force in the direction extending to the flexible substrate 5 is applied, so that the flexible substrate 5 becomes the first contact portion. 12t and the second contact portion 52t come into contact with each other. As a result, the flexible substrate 5 can be attached later to the wire to be measured without applying stress due to bending or the like, and a plurality of magnetic sensors 3 mounted on the flexible substrate 5 can be attached to the wire to be measured CA. On the other hand, it can arrange | position with high precision.

  In addition, since the plurality of magnetic sensors 3 are arranged on the respective sides of the first contact portion 12t and the second contact portion 52t forming a regular polygon, the magnetic sensor 3 is connected to the measured wire CA. Thus, the adjacent magnetic sensors 3 can be arranged at equal angles. Thus, by adding the detection values of the respective magnetic sensors 3, even if the position of the electric wire CA to be measured is slightly shifted, it is possible to make it difficult to reduce the measurement accuracy.

  In addition, since the eight magnetic sensors 3 are arranged on the respective sides of the first contact portion 12t and the second contact portion 52t that form a regular octagon, Thus, the magnetic sensors 3 can be provided at positions where the adjacent magnetic sensors 3 are at equal angles and are opposed to each other. Thus, by adding the detection values of the respective magnetic sensors 3, even if the position of the electric wire CA to be measured is slightly shifted, it is possible to make it difficult to reduce the measurement accuracy and to detect the opposing magnetic sensors 3 to each other. By comparing the difference in values, the influence of the external magnetic field can be offset, and the influence from the external magnetic field can be easily reduced.

  In addition, since the bottom surface of the magnetic sensor 3 in contact with the flexible substrate 5 is a flat surface, the bottom surface of each of the plurality of magnetic sensors 3 and the first contact portion 12t and the second contact portion 52t are flat surfaces. And come into contact via the flexible substrate 5. Thereby, the position accuracy of the magnetic sensor 3 and the accuracy of the arrangement angle of the magnetic sensor 3 can be increased, and the measurement accuracy can be increased.

  Further, the first fixing portion 12k provided in the vicinity of the opening / closing side of the main body side support 12 and the second fixing portion 52k provided in the vicinity of the opening / closing side of the hinge side support 52 are flexible. Since both ends of the flexible substrate 5 are fixed to the first contact portion 12t and the second contact portion 52t, a portion where the flexible substrate 5 is deformed when opened is long. This can prevent stress from concentrating on a part of the flexible substrate 5 and extend the life of the current sensor 101.

  Further, in a state where the main body side support body 12 and the hinge part side support body 52 are closed, the convex part 24 t provided on the first end surface 12 p of the main body side support body 12 is the second part of the hinge part side support body 52. Since the main body side support body 12 and the hinge part side support body 52 are fixedly fitted to the recess 24r provided with the end face 52p, the support body 2 can be easily closed with a simple mechanism. As a result, it is easy to assemble and the manufacturing cost can be reduced.

  In addition, this invention is not limited to the said embodiment, For example, it can deform | transform and implement as follows, These embodiments also belong to the technical scope of this invention.

  FIG. 9 is a configuration diagram illustrating a second modification of the current sensor 101 according to the first embodiment of the present invention. FIG. 9A is a perspective view of an example in which the shape of the support 2 is changed. FIG. 9B is a bottom view seen from the Z2 side shown in FIG. FIG. 10 is a configuration diagram illustrating a third modification of the current sensor 101 according to the first embodiment of the present invention, and FIG. 10A is a perspective view of an example in which the shape of the support 2 is changed. FIG. 10B is an enlarged bottom view seen from the Z2 side shown in FIG.

<Modification 1>
In the first embodiment, the shape of the outer periphery of the support 2 is a substantially octagonal prism. However, when the planar view shape on which the magnetic sensor 3 is arranged is a regular polygon, it becomes a regular prism.

<Modification 2>
In the first embodiment, all of the outer peripheral shape of the support 2 is a substantially octagonal prism, but as shown in FIG. 9, the magnetic sensor C33 may be arranged in a regular octagon.

<Modification 3>
In the first embodiment, the magnetic sensor 3 is arranged on the same circumference of the outer periphery of the support 2. However, as shown in FIG. 10, the magnetic sensor is spirally formed on the outer periphery of the support C 32. A configuration in which C33 is arranged may be used. For this reason, even if it is large magnetic sensor C33, eight can be arrange | positioned around the to-be-measured electric wire CA. Further, since the magnetic sensor C33 is disposed in a spiral shape, it can be disposed over one or more rounds, and eight or more magnetic sensors C33 can be disposed.

<Modification 4>
In the first embodiment, the first end surface 12p is provided with the convex portion 24t, and the second end surface 52p is provided with the concave portion 24r. However, the first end surface 12p is provided with the concave portion, Alternatively, the second end face 52p may be provided with a convex portion. Similarly, a configuration may be adopted in which a concave portion is provided on the open / close side surface of the main body side housing 11 and a convex portion is provided on the open / close side surface of the hinge portion side housing 51. Moreover, the combination which the said 2 sets (a convex part and a recessed part) interchanged may be sufficient.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the object of the present invention.

DESCRIPTION OF SYMBOLS 1 Housing | casing 11 Main body side housing | casing 51 Hinge part side housing | casing 2, C32 support body 12 Main body side support body 12k 1st fixing | fixed part 12m 1st groove | channel 12p 1st end surface 12t 1st contact part 52 Hinge part Side support 52k Second fixing part 52m Second groove 52p Second end face 52t Second contact part 3, C33 Magnetic sensor 14r, 24r Concave part 14t, 24t Convex part 5 Flexible substrate 101 Current sensor CA Covered Measuring wire

Claims (6)

A support body disposed so as to surround an outer edge of the measured electric wire; a housing provided in connection with the support body; and a plurality of magnetic sensors disposed on the support body; A current sensor for detecting magnetism generated when a current flows by the magnetic sensor,
The housing includes a main body side housing and a hinge portion side housing having a hinge portion side axis that overlaps with a main body side shaft provided in the main body side housing,
The support comprises a main body side support provided by being connected from the main body side housing, and a hinge part side support provided by being connected from the hinge part side housing,
The main body side support body and the hinge part side support body rotate around the main body side axis and the hinge part side axis, and can be opened and closed.
The main body side support is provided with a first groove, and the hinge part side support is provided with a second groove,
The first groove and the second groove are opposed to each other in a state where the main body side support body and the hinge part side support body are closed, and the inner periphery of the support body surrounds the outer edge of the electric wire to be measured. Form part of
The main body side support body and the hinge part side support body form a part of the outer periphery of the support body,
A first contact portion is provided along the outer periphery of the main body side support, and a second contact portion is provided along the outer periphery of the hinge portion support.
The main body side shaft and the hinge portion side shaft are provided between the inner periphery of the support and the outer periphery of the support in a plan view from the axial direction of the main body side shaft and the hinge portion side shaft. And
The magnetic sensor is mounted on a flexible substrate,
A first fixing portion that fixes the flexible substrate and the first contact portion; and a second fixing portion that fixes the flexible substrate and the second contact portion. And
When the main body side support body and the hinge part side support body are closed, the flexible substrate comes into contact with the first contact portion and the second contact portion, and the main body side support body. And the hinge part side support body are open, the flexible substrate is separated from a part of the first contact part and a part of the second contact part. Current sensor. A virtual shape that connects the first contact part and the second contact part in a plan view of the support body in a state where the main body side support body and the hinge part side support body are closed. Is a regular polygon,
The said magnetic sensor is arrange | positioned on each edge | side of the said 1st contact part and the said 2nd contact part which form the said regular polygon, The Claim 1 characterized by the above-mentioned. Current sensor.   The current sensor according to claim 2, wherein the regular polygon is a regular octagon, and the number of the magnetic sensors is eight.   The current sensor according to claim 2, wherein the magnetic sensor has a flat bottom surface in contact with the flexible substrate.   The first fixing part is provided in the vicinity of the opening / closing side of the main body side support, the second fixing part is provided in the vicinity of the opening / closing side of the hinge part side support, and both ends of the flexible substrate are attached to the ends of the flexible substrate. The first fixing part and the second fixing part are fixed to the first abutting part and the second abutting part by the first fixing part and the second fixing part, respectively. Current sensor. A first end surface formed on the opening and closing side of the main body side support and a second end surface formed on the opening and closing side of the hinge portion side support are disposed to face each other.
A concave portion is provided on one of the first end surface and the second end surface, and a convex portion is provided on the other,
In a state where the main body side support body and the hinge part side support body are closed, the convex part is strongly fitted into the concave part, and the main body side support body and the hinge part side support body are fixed. The current sensor according to claim 1, wherein the current sensor is a current sensor.

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