JP5452190B2 - Current sensor and assembly method thereof - Google Patents

Description

  The present invention relates to a current sensor and a method for assembling the current sensor. More particularly, the present invention relates to a current sensor and a method for assembling the current sensor. The present invention relates to an enabled current sensor and an assembling method thereof.

  A conventional current sensor has a generally U-shaped core and a core of this core in order to detect a current flowing in a general-purpose inverter for industrial use, a motor control device, or a current conductor to be measured wired in such a device. It has a magnetic sensor arranged in the gap part, and these cores and magnetic sensors are covered with insulating resin to integrate them, and the magnetic sensor detects changes in magnetic flux generated in the core as current. (For example, refer to Patent Document 1).

  In addition, in order to sandwich and fix these cores, magnetic sensors, and the like with case members and lid members, a core, magnetic sensor, and the like are integrated by resin molding (see, for example, Patent Document 2).

  In recent years, in order to reduce the size and thickness of current sensors, there has been a demand for product development that focuses on spatial distances and creepage distances while considering safety standards for electrical equipment. In order to achieve electrical insulation without isolating electrical component elements with an insulator, it is necessary to ensure both clearance and creepage distance. Clearance is the shortest distance through the space between two conductive portions, and creepage distance is the shortest distance along the surface of the insulator between the two conductive portions. doing. These distances required to achieve insulation are affected by a number of factors, including the required strength of insulation, the operating voltage and expected overvoltage level, the degree of contamination, and the tracking resistance of the insulation. Sufficient consideration is also required for the development of current sensors.

  For example, the one described in Patent Document 3 relates to a current sensor that has a good creepage distance between a primary circuit and a secondary circuit without using a three-layer electric wire and has good assemblability, and is formed in a bobbin. One core leg is inserted into the cylindrical core leg insertion part, the coil body of the coil is provided on the outer periphery of the coil mounting part outside the core leg insertion part, and the connecting part side of the core is the side surface of the bobbin The creeping distance between the coil and the core can be secured by a bobbin.

  Further, the one described in Patent Document 4 relates to a current detection mechanism and an assembly method thereof, and is not focused on ensuring a creepage distance, but is disposed at a joint between two detachable current conductors that can be attached and detached, Equipped with a magnetic core having at least one air gap so as to surround the joint and a magnetic sensor disposed in the air gap, the current detection mechanism can be assembled to reduce the size and area. It is a thing.

JP 09-257836 A JP 2009-222729 A JP 2005-90982 A JP 2007-178241 A

  However, in the above-described Patent Documents 1 and 2, the entire components of the current sensor are covered, or these components are housed and packaged, and the inside of the package is resin-molded. There is a problem that the work for integration is complicated and cannot be simplified or downsized.

  Moreover, although the thing of the patent document 3 mentioned above is aiming at size reduction paying attention to creepage distance, the room for the further improvement is left about simplification of the number of parts of an electric current sensor, simplification of an assembly, etc. It was.

  Further, although the above-mentioned Patent Document 4 is significant in that it achieves a small and easy assembly with a minimum number of parts, it is easy for the user to assemble the current detection mechanism on site with a small number of components. This was not possible, and the product as a current sensor did not contribute to product development focusing on creepage distance while taking into account safety standards for electrical equipment. Therefore, further improvement has been demanded in order to simplify and miniaturize the assembly of the current sensor alone.

  The present invention has been made in view of such a situation, the purpose of which is to ensure the creepage distance while considering safety standards for electrical equipment, and can operate in a high voltage environment, It is another object of the present invention to provide a current sensor and an assembling method thereof that can be easily assembled so as to reduce the size and occupy a small area.

  The present invention has been made to achieve such an object, and the invention according to claim 1 includes a first fitting portion having a creeping distance that can be fitted into an upper surface, and the first fitting portion. A main body case member in which a first gap is formed between the upper surface and the lower surface in the longitudinal direction, a magnetic sensor mounted on the upper surface side of the main body case member, and a current conductor to be measured; Creeping surface that can be fitted into the first fitting portion of the main body case member on the lower surface so as to cover the primary conductor disposed in the orthogonal direction at the facing position of the magnetic sensor, and the magnetic sensor and the primary conductor. A lid case member having a second fitting portion having a distance and having a second gap formed between the lower surface and the upper surface in the longitudinal direction of the second fitting portion, and the primary conductor sandwiched therebetween The first and second of the main body case member and the lid case member A magnetic core having a U-shaped cross-section inserted and fixed in the gap, and the creeping distance is secured by the first and second fitting portions of the main body case member and the lid case member, and the magnetic body A magnetic flux change generated in the magnetic core is detected as an electric current by the magnetic sensor disposed in a gap portion with the U-shaped cross section of the core. (Examples 1 and 2)

  The invention according to claim 2 is the invention according to claim 1, wherein the main body case member is arranged so that the primary conductor is tightly held between the main body case member and the lid case member. A plurality of the first fitting portions are provided, and the primary conductor is incorporated between the first fitting portions of the main body case member. Example 1

  According to a third aspect of the present invention, in the first aspect of the present invention, the magnetic sensor is tightly sandwiched between the main body case member and the lid case member, and the primary conductor is the first conductor. A fitting portion and the second fitting portion are joined and arranged. (Example 2)

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the invention, any one of the first fitting portion and the second fitting portion is a rectangular or convex shape. It is characterized by a wavy shape.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the main body case member and the lid case member have a mounting groove at a mounting position of the magnetic sensor. To do.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein a locking portion is provided at a rear end position of the core of the main body case member and the lid case member. Features.

  The invention according to claim 7 is the invention according to claim 6, wherein the locking portion is a protrusion or a combination of a protrusion and a notch.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, a lead wire partitioning portion of the magnetic sensor is provided in the magnetic sensor mounting portion of the main body case member. It is characterized by that.

  According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, the lid case member is provided with a fitting claw, and the main body case member receives the fitting claw. Is provided.

  The invention according to claim 10 is the invention according to any one of claims 1 to 9, wherein the U-shaped cross section of the magnetic core has a U-shaped cross section or a cross section with a narrowed tip. It includes a C-shaped shape.

  The invention according to claim 11 is the invention according to any one of claims 1 to 10, wherein the magnetic sensor is a Hall IC.

  According to a twelfth aspect of the invention, in the invention of the eleventh aspect, the magnetic sensor includes a magnetic detection element and a signal processing circuit that processes a detection signal from the magnetic detection element. The processing circuit has a non-volatile memory or resistance trimming adjustable function for reducing variation in detection characteristics of the magnetic detection element.

  The invention according to claim 13 includes a first fitting portion having a creeping distance that can be fitted into the upper surface, and a first gap portion between the upper surface and the lower surface in the longitudinal direction of the first fitting portion. Providing a main body case member formed with a primary conductor connected to the current conductor to be measured in a direction orthogonal to the facing position of the magnetic sensor, and the upper surface side of the main body case member And a second fitting portion having a creeping distance that can be fitted into the first fitting portion of the body case member on the lower surface so as to cover the magnetic sensor and the primary conductor. And a step of fitting a lid case member in which a second gap is formed between the lower surface and the upper surface in the longitudinal direction of the second fitting portion into the main body case member, and sandwiching the primary conductor The body case member and the Inserting and fixing a U-shaped core in the first and second gaps of the case member, and the creepage at the first and second fitting portions of the main body case member and the lid case member A method for assembling a current sensor, wherein a change in magnetic flux generated in the core is detected as a current by the magnetic sensor disposed in a gap portion along the U-shaped cross section of the core while securing a distance. (Examples 1 and 2)

  The invention according to claim 14 is the invention according to claim 13, wherein the main body case member is arranged so that the primary conductor is tightly held between the main body case member and the lid case member. A plurality of the first fitting portions are provided, and the primary conductor is incorporated between the first fitting portions of the main body case member. Example 1

  The invention according to claim 15 is the invention according to claim 13, wherein the magnetic sensor is tightly sandwiched between the main body case member and the lid case member, and the primary conductor is the first conductor. A fitting portion and the second fitting portion are joined and arranged. (Example 2)

  According to the present invention, the primary conductor is completely covered with a resin case to ensure a creepage distance from the magnetic core and the magnetic sensor, and can operate even in a high voltage environment, and can be reduced in size and occupied area. Thus, it is possible to realize a current sensor and an assembling method thereof that can be easily assembled.

  In addition, since the magnetic sensor is completely covered with a resin case, the creepage distance from the primary conductor and magnetic core to the magnetic sensor terminal is secured, so that it can operate even in the case of large current measurement with a large effective current and is downsized. In addition, a current sensor and an assembling method thereof that can be easily assembled so as to reduce the occupied area can be realized.

It is a perspective view for demonstrating Embodiment 1 of the current sensor which concerns on this invention. It is the sectional view on the AA line of FIG. It is a perspective view for demonstrating Embodiment 2 of the current sensor which concerns on this invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is sectional drawing for demonstrating Example 1 of the engaging means of the magnetic body core in Embodiment 1 or 2 of this invention, a cover case member, and a main body case member. It is sectional drawing for demonstrating Example 2 of the engaging means with the magnetic body core in Embodiment 1 or 2 of this invention, a cover case member, and a main body case member. It is process drawing for demonstrating the assembly method of the current sensor which concerns on this invention. It is a figure which shows the flowchart for demonstrating the assembly method of the current sensor which concerns on this invention.

  One of the gist of the present invention is to ensure the creepage distance while taking into account safety standards for electrical equipment. However, since the creepage distance is larger than the spatial distance, in the present invention, only the creepage distance is considered. It will be good. Therefore, the high voltage portion is the primary conductor through which the current to be measured flows. On the other hand, the portion to be protected according to safety standards corresponds to the control system GND terminal and the terminal portion of the magnetic sensor.

  As a contrivance, we found a simple fitting method using a resin case compared to the conventional method of molding the entire magnetic sensor, minimizing the stress applied to the current sensor and magnetic core, and after assembly A highly accurate current sensor with less offset fluctuation and temperature drift was realized.

  In addition, when fixing each component with a resin case, it is necessary to consider the shortest creepage distance along the fitting portion, but in the present invention, in order to achieve miniaturization, as described in Embodiments 1 and 2, A compact current sensor that can operate even in a high-voltage environment has been realized by forming the fitting part into a rectangular or wave shape and increasing the creepage distance.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
[Embodiment 1]
FIG. 1 is a perspective view for explaining a first embodiment of a current sensor according to the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. Embodiment 1 of the present invention is an example in which a primary conductor is completely covered with a resin case to ensure a creeping distance from the magnetic core and the magnetic sensor, and the gap between the magnetic core and the magnetic sensor is narrow. This is effective when it is difficult to secure the distance from the magnetic core.

  In the figure, reference numeral 10 denotes a body case member (resin case), 10a denotes a first fitting portion, 10b denotes a magnetic sensor mounting groove, 10c denotes a locking portion provided at the rear end position of the core, and 10d denotes a first gap portion. , 20 is a magnetic sensor, 20a is a lead wire of the magnetic sensor, 30 is a primary conductor connected to the current conductor to be measured, 40 is a lid case member (resin case), 40a is a second fitting portion, and 40b is a magnetic sensor. The positioning groove, 40c is a locking portion provided at the rear end position of the core, 40d is a second gap, and 50 is a magnetic core.

  The current sensor according to the first embodiment of the present invention is configured to be easily assembled by the five components of the main body case member 10, the magnetic sensor 20, the primary conductor 30, the lid case member 40, and the magnetic core 50. This assembly is realized only by fitting or joining these components without using a conventional resin mold or adhesive.

  The main body case member 10 includes a first fitting portion 10a having a creeping distance that can be fitted into the upper surface, and a first gap portion 10d is formed between the upper surface and the lower surface in the longitudinal direction of the first fitting portion 10a. The first fitting portion 10a has an uneven portion.

  The lid case member 40 includes a second fitting portion 40a having a creeping distance that can be fitted into the lower surface, and a second gap 40d is provided between the lower surface and the upper surface in the longitudinal direction of the second fitting portion 40a. The second fitting portion 40a is formed with a concavo-convex portion.

  Thereby, the uneven | corrugated | grooved part of the main body case member 10 and the uneven | corrugated | grooved part of the lid | cover case member 40 are engage | inserted mutually. In addition, it is desirable that the uneven portion has a rectangular or wavy shape.

  Further, a mounting groove 10b is provided at the mounting position of the magnetic sensor 20 of the main body case member 10, and similarly, a mounting groove 40b is provided at the mounting position of the magnetic sensor 20 of the lid case member 40, and these mounting grooves 10b, The magnetic sensor 20 is configured to be fixed by the main body case member 10 and the lid case member 40 by 40b. The magnetic sensor 20 is preferably a Hall IC.

  In addition, the magnetic sensor 20 includes a magnetic detection element and a signal processing circuit that processes a detection signal from the magnetic detection element. This signal processing circuit is used to reduce variations in detection characteristics of the magnetic detection element. It has an adjustable function for nonvolatile memory or resistance trimming.

  The primary conductor 30 is connected to the current conductor to be measured and is fitted into the recess between the two first fitting portions 10a of the main body case member 10 so as to be arranged in the orthogonal direction at the facing position of the magnetic sensor 20. Yes. That is, the main body case member 10 includes a plurality of first fitting portions 10 a and 10 a, and the primary conductor 30 is incorporated between the first fitting portions 10 a and 10 a of the main body case member 10, and the lid case member 40. It is comprised so that it may be pressed by.

  The U-shaped magnetic core 50 is inserted and fixed in the first gap 10d of the main body case member 10 and the second gap 40d of the lid case member 40 so as to sandwich the primary conductor 30 and the magnetic sensor 20. It is configured as follows. The U-shaped cross section of the magnetic core 50 includes a U-shaped section or a C-shaped section with a narrowed tip.

  In addition, the rear end of the magnetic core 50 of the main body case member 10 and the lid case member 40 is stopped so as to stop the rear end of the magnetic core 50, that is, the upper and lower ends on the opposite side of the gap portion with a U-shaped cross section. Locking portions 10c and 40c made of protrusions are provided at the positions.

  In this manner, the creepage distance is ensured by the first and second fitting portions 10a and 40a of the main body case member 10 and the lid case member 40, and the magnetic sensor 20 disposed in the gap portion of the magnetic core 50 is magnetic. It is possible to detect a change in magnetic flux generated in the body core 50 as a current.

[Embodiment 2]
FIG. 3 is a perspective view for explaining a second embodiment of the current sensor according to the present invention, and FIG. 4 is a sectional view taken along line BB of FIG. Embodiment 2 of the present invention is an example in which the magnetic sensor is completely covered with a resin case, and a creeping distance from the primary conductor or magnetic core to the terminal of the magnetic sensor is ensured. In the case of measurement, the primary conductor must be thickened, which is effective when it is difficult to secure the distance between the magnetic core and the primary conductor.

  The difference in configuration from the first embodiment described above is that, in the second embodiment, in addition to the fact that the entire magnetic sensor is closely held between the main body case member and the lid case member, There is only one fitting with the lid case member, and the primary conductor and the magnetic core are insulated via the gap.

  In the figure, reference numeral 110 denotes a body case member (resin case), 110a denotes a first fitting portion, 110b denotes a magnetic sensor mounting groove, 110c denotes a locking portion provided at the rear end position of the magnetic core, and 110d denotes a first portion. Gap part, 120 is a magnetic sensor, 120a is a lead wire of the magnetic sensor, 130 is a primary conductor connected to the current conductor to be measured, 140 is a lid case member (resin case), 140a is a second fitting part, and 140b is magnetic The sensor positioning groove, 140c is a locking portion provided at the rear end position of the magnetic core, 140d is a second gap, and 150 is the magnetic core.

  The current sensor according to the second embodiment of the present invention is configured to be easily assembled by the five components of the main body case member 110, the magnetic sensor 120, the primary conductor 130, the lid case member 140, and the magnetic core 150. This assembly is realized only by fitting or joining these components without using a conventional resin mold or adhesive.

  The body case member 110 includes a first fitting portion 110a having a creeping distance that can be fitted into the upper surface, and a first gap portion 110d is formed between the upper surface and the lower surface in the longitudinal direction of the first fitting portion 110a. The first fitting portion 110a has an uneven portion.

  The lid case member 140 includes a second fitting portion 140a having a creepage distance that can be fitted into the lower surface, and a second gap portion 140d is provided between the lower surface and the upper surface in the longitudinal direction of the second fitting portion 140a. The second fitting portion 140a is formed with a concavo-convex portion.

  Thereby, the uneven part of the main body case member 110 and the uneven part of the lid case member 140 are fitted into each other. In addition, it is the same as that of Embodiment 1 mentioned above that this uneven | corrugated | grooved part may be a rectangle or a wave shape.

  In the first embodiment described above, there are a plurality of sets of the first fitting portion 10a and the second fitting portion 40a. That is, one set of fitting portions is provided between the magnetic sensor 20 and the primary conductor 30. In the second embodiment, one set of fitting portions is provided between the magnetic sensor 120 and the primary conductor 130, although another set of fitting portions is provided between the primary conductor 30 and the magnetic core. Only the portion is provided, and the primary conductor 130 and the magnetic core 150 are insulated by a gap.

  Further, the mounting groove 110b is provided at the mounting position of the magnetic sensor 120 of the main body case member 110, and similarly, the mounting groove 140b is provided at the mounting position of the magnetic sensor 120 of the lid case member 140, and these mounting grooves 110b, The magnetic sensor 120 is configured to be closely fixed by the main body case member 110 and the lid case member 140 by 140b. The magnetic sensor 120 is preferably a Hall IC. The configuration of the magnetic sensor 120 is the same as that in the first embodiment described above.

  The primary conductor 130 is connected to the current conductor to be measured and is joined to the first fitting portion 110a and the second fitting portion 140a so as to be arranged in the orthogonal direction at the facing position of the magnetic sensor 120.

  The U-shaped magnetic core 150 is inserted and fixed in the first gap 110d of the main body case member 110 and the second gap 140d of the lid case member 140 so as to sandwich the primary conductor 130 and the magnetic sensor 120. It is configured as follows. About the shape of this magnetic body core, it is the same as that of the case of Embodiment 1 mentioned above. Further, the rear end of the magnetic core 150 of the main body case member 110 and the lid case member 140 is stopped so as to stop the rear end of the magnetic core 150, that is, the upper and lower ends on the opposite side of the gap portion with the U-shaped cross section. At positions, protrusion locking portions 110c and 140c are provided.

  In this manner, the creepage distance is secured by the first and second fitting portions 110a and 140a of the main body case member 110 and the lid case member 140, and the magnetic sensor 120 disposed in the gap portion of the magnetic core 150 is magnetic. It is possible to detect a change in magnetic flux generated in the body core 150 as a current.

  FIG. 5 is a cross-sectional view for explaining Example 1 of the engaging means of the magnetic core, the lid case member, and the main body case member in Embodiment 1 or 2 of the present invention. As described above, the engaging means of the magnetic core in Embodiments 1 and 2 of the present invention, the lid case member, and the main body case member uses the engaging means of Example 1.

  At the rear end position of the magnetic core 50 of the main body case member 10 and the lid case member 40 so as to stop the rear end portion of the magnetic core 50, that is, the upper and lower end portions on the opposite side of the gap portion 201 having a U-shaped cross section. Are provided with locking portions 10c, 40c made of protrusions.

  With such a configuration, at least one protrusion is provided at the rear end portion of the magnetic core 50 of the main body case member 10 and the lid case member 40 so that the magnetic core 50 is bonded after being inserted into the case member. And the magnetic core can be fixed. Moreover, you may provide this protrusion in the left-right direction other than the upper-lower-end part mentioned above. This engaging portion is convenient in the case of a material that is brittle in strength, such as a magnetic core made of ferrite, and in which the core is easily cracked or chipped by an external force. The same applies to Embodiment 2 of the present invention shown in FIG.

  FIG. 6 is a cross-sectional view for explaining Example 2 of the engaging means for the magnetic core, the lid case member, and the main body case member in Embodiment 1 or 2 of the present invention.

  Protrusions 50 a are provided at the rear end of the magnetic core 50 so as to stop the upper and lower ends on the opposite side of the gap portion 201 having a U-shaped cross section, and the rear of the magnetic core 50 of the main body case member 10 and the lid case member 40. A cutout 40e that receives the protrusion 50a of the magnetic core 50 is provided at the end position.

  With such a configuration, since the stress applied to the magnetic core is only the last push, the damage to the magnetic core is small and the insertion work is facilitated. This locking portion is suitable for a metal core such as silicon steel that is easy to finely process and has high strength. The same applies to Embodiment 2 of the present invention shown in FIG.

  As described above, in the first and second embodiments of the locking portion described above, the thermal effect treatment becomes unnecessary by omitting the bonding step, and as a result, the thermal stress on the magnetic sensor can be reduced, and the reliability can be reduced. The improvement can be achieved and the manufacturing process can be shortened.

Next, a method for assembling the current sensor of the present invention will be described below.
FIGS. 7A to 7E are process diagrams for explaining a current sensor assembling method according to the present invention, and FIG. 8 is a flowchart for explaining a current sensor assembling method according to the present invention. FIG. 2 shows a cross-sectional view after assembly. In FIGS. 7A to 7E, various components necessary for assembly are provided. In addition, the following assembly method demonstrates the case of Embodiment 1 mentioned above.

  First, a main body case including a first fitting portion 10a having a creeping distance that can be fitted into the upper surface, and a first gap portion 10d formed between the upper surface and the lower surface in the longitudinal direction of the first fitting portion 10a. The member 10 is prepared (step S1 in FIG. 8).

  The body case member 10 includes an upper right fitting stopper 11 and an upper left fitting stopper 12 at a corner on the magnetic core 50 side, and a lower left fitting stopper 13 and a lower right fitting at a corner on the magnetic sensor 20 side. And a stop 14.

  Further, the cover groove 16 of the primary conductor 30 on the upper surface of the main body case member 10 is provided, and the positioning pin 15 of the primary conductor 30 is provided on the surface of the groove 16, and the positioning pin 15 and the primary conductor 30 are provided. The fitting groove 31 provided in the is fitted.

  Further, on the upper surface of the main body case member 10, an alignment pin 17 is erected on the end so as to be adjacent to the groove 16, and this alignment pin is provided on the upper surface of the main body case member 10. The magnetic sensor positioning groove 18 is provided between the magnetic sensor 20 and the mounting side of the magnetic sensor 20, and a plurality of dividing grooves 19 corresponding to the plurality of lead wires 20a of the magnetic sensor 20 are provided on the mounting side of the magnetic sensor 20. As a result, a section is formed. This partitioning portion can prevent dust from entering the case and short-circuiting between the lead wires.

  Next, the primary conductor 30 connected to the current conductor to be measured is arranged in the orthogonal direction at the facing position of the magnetic sensor 20 (FIG. 7A and step S2 in FIG. 8). That is, as described above, the positioning pin 15 provided in the main body case member 10 and the fitting groove 31 provided in the primary conductor 30 are fitted and fitted.

  Next, the magnetic sensor 20 is mounted in the positioning groove 18 provided in the main body case member 10 (FIG. 7B and FIG. 8 step S3), and the lead wire 20a of the magnetic sensor 20 has a plurality of sections constituting the section. Each of the plurality of lead wires 20 a is divided by the dividing groove 19.

  Next, a second fitting portion 40a having a creeping distance that can be fitted into the first fitting portion 10a of the main body case member 10 is provided on the lower surface so as to cover the magnetic sensor 20 and the primary conductor 30. A lid case member 40 is prepared in which a second gap 40d is formed between the lower surface and the upper surface in the longitudinal direction of the fitting portion 40a (step S4 in FIG. 8).

  The lid case member 40 corresponds to the upper right fitting stopper 11, the upper left fitting stopper 12, the lower left fitting stopper 13, and the lower right fitting stopper 14 provided in the main body case member 10. An upper right fitting claw 41, an upper left fitting claw 42, a lower left fitting claw 43, and a lower right fitting claw 44 are provided.

  The lid case member 40 is provided with a cover groove 46 that covers the primary conductor 30 fitted on the upper surface of the main body case member 10, and the alignment pin 17 provided on the upper surface of the main body case member 10 An alignment groove 47 is provided so as to correspond. Further, a magnetic sensor positioning groove 48 corresponding to the magnetic sensor positioning groove 18 provided in the main body case member 10 is provided.

  Next, the cover case member 40 is put on the main body case member 10 (FIG. 7C and step S5 in FIG. 8). In this case, the upper right fitting stopper 11 provided on the main body case member 10 is positioned so as to be fitted to the upper right fitting claw 41 provided on the lid case member 40, and the upper left fitting stopper 12 is positioned at the upper part. The left fitting claw 42, the lower left fitting stopper 13 are fitted to the lower left fitting claw 43, the lower right fitting stopper 14 is fitted to the lower right fitting claw 44, and the alignment pin 17 is fitted to the alignment groove 47, respectively. To be positioned.

  Next, a U-shaped magnetic core 50 is inserted and fixed in the first gap portion 10d and the second gap portion 40d of the main body case member 10 and the lid case member 40 so as to sandwich the primary conductor 30 (FIG. 7 ( d) and step S6) of FIG.

  The assembly method according to the second embodiment is also performed in the same manner as the assembly method according to the first embodiment described above.

10, 110 Main body case members 10a, 110a First fitting portions 10b, 110b Magnetic sensor mounting grooves 10c, 110c Locking portions 10d, 110d provided at the rear end position of the core First gap portion 11 Upper right fitting stop 12 Upper left mating stopper 13 Lower left mating stopper 14 Lower right mating stopper 15 Positioning pin 16 Groove for cover on main body case side 17 Alignment pin 18 Positioning groove on main body case side 19 Dividing grooves 20, 120 Magnetic sensor 20a , 120a Magnetic sensor lead wires 30, 130 Primary conductor 31 connected to current conductor to be measured Fitting groove 40, 140 Lid case member 40a, 140a Second fitting portion 40b, 140b Magnetic sensor positioning groove 40c, 140c Core Locking portions 40d, 140d provided at the rear end position Second gaps 40e, 140e Notch 41 Upper right fitting claw 42 Upper left fitting claw 43 Lower left fitting claw 44 Lower right fitting claw 46 Cover groove 47 on the cover case side Alignment groove 48 on the main body case side Positioning groove 50, 150 Core 50a, 150a Projection 201 on the cover case side Gap

Claims (15)

A body case member comprising a first fitting portion having a creeping distance that can be fitted into the upper surface, wherein a first gap is formed between the upper surface and the lower surface in the longitudinal direction of the first fitting portion;
A magnetic sensor mounted on the upper surface side of the main body case member;
A primary conductor connected to the current conductor to be measured and arranged in an orthogonal direction at the facing position of the magnetic sensor;
A second fitting portion having a creeping distance that can be fitted into the first fitting portion of the main body case member on a lower surface so as to cover the magnetic sensor and the primary conductor; A lid case member in which a second gap is formed between the lower surface and the upper surface in the longitudinal direction;
A main body case member and a U-shaped magnetic core inserted into and fixed to the first and second gap portions of the lid case member so as to sandwich the primary conductor;
The magnetic sensor disposed in the gap portion of the magnetic core having the U-shaped cross section while securing the creepage distance at the first and second fitting portions of the main body case member and the lid case member. A current sensor that detects a change in magnetic flux generated in the magnetic core as a current.   The main body case member has a plurality of first fitting portions so that the primary conductor is tightly sandwiched between the main body case member and the lid case member, and the primary conductor is The current sensor according to claim 1, wherein the current sensor is incorporated between the first fitting portions of the main body case member.   The magnetic sensor is tightly sandwiched between the main body case member and the lid case member, and the primary conductor is joined and disposed to the first fitting portion and the second fitting portion. The current sensor according to claim 1.   4. The current sensor according to claim 1, wherein one of the first fitting portion and the second fitting portion has a rectangular or wavy shape having a convex or concave portion.   5. The current sensor according to claim 1, further comprising a mounting groove at a mounting position of the magnetic sensor on the main body case member and the lid case member.   The current sensor according to claim 1, wherein a locking portion is provided at a rear end position of the core of the main body case member and the lid case member.   The current sensor according to claim 6, wherein the locking portion is a protrusion or a combination of a protrusion and a notch.   The current sensor according to any one of claims 1 to 7, wherein the magnetic sensor mounting portion of the main body case member is provided with a section of a lead wire of the magnetic sensor.   9. The current sensor according to claim 1, wherein a fitting claw is provided on the lid case member, and a fitting stop is provided on the main body case member to receive the fitting claw.   10. The current sensor according to claim 1, wherein the U-shaped cross-section of the magnetic core includes a U-shaped cross-section or a C-shaped cross-section with a narrowed tip. .   The current sensor according to claim 1, wherein the magnetic sensor is a Hall IC.   The magnetic sensor includes a magnetic detection element and a signal processing circuit that processes a detection signal from the magnetic detection element, and the signal processing circuit includes a non-volatile for reducing variation in detection characteristics of the magnetic detection element. The current sensor according to claim 11, wherein the current sensor has an adjustable function of a directional memory or resistance trimming. A body case member is provided that includes a first fitting portion having a creeping distance that can be fitted into the upper surface, and in which a first gap is formed between the upper surface and the lower surface in the longitudinal direction of the first fitting portion. Steps,
Disposing a primary conductor connected to a current conductor to be measured in an orthogonal direction at a facing position of the magnetic sensor;
Mounting a magnetic sensor on the upper surface side of the main body case member;
A second fitting portion having a creeping distance that can be fitted into the first fitting portion of the main body case member on the lower surface so as to cover the magnetic sensor and the primary conductor; Fitting a lid case member in which a second gap is formed between the lower surface and the upper surface in the longitudinal direction of the main body case member;
Inserting and fixing a U-shaped core in the first and second gaps of the body case member and the lid case member so as to sandwich the primary conductor,
The core is secured by the magnetic sensor disposed in the gap portion of the core with the first and second fitting portions of the main body case member and the lid case member, and at the gap portion with the U-shaped cross section of the core. A method for assembling a current sensor, wherein a change in magnetic flux generated in the current sensor is detected as a current.   The main body case member has a plurality of first fitting portions so that the primary conductor is tightly sandwiched between the main body case member and the lid case member, and the primary conductor is The current sensor assembling method according to claim 13, wherein the current sensor is assembled between the first fitting portions of the main body case member.   The magnetic sensor is tightly sandwiched between the main body case member and the lid case member, and the primary conductor is joined and disposed to the first fitting portion and the second fitting portion. The method for assembling the current sensor according to claim 13.

Images