JP2008216048A - Manufacturing method of current sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture without causing positional deviation of a magnetic sensor in the gap of the core from occurring, when a core is housed in a case and sealed with a resin. <P>SOLUTION: The current sensor 1 is previously assembled with a magnetic sensor 4 in the case 2 which is mounted on the pallet 7 for assembling. On the pallet 7, a magnet 8 for picking up the core is provided; and when the case 2 is mounted on the pallet 7, the core is made to abut against the outer peripheral wall 2a and the magnet 8 is set to a state with the core 3 attracted. In this state, since a resin 5 is impregnated and cured, positional deviation is reduced, thereby the current sensor without variance in the output performance can be manufactured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a through-type current sensor including a core provided so as to form a closed magnetic circuit including an air gap, and a magnetic sensor disposed in the air gap.

  The through-type current sensor combines, for example, a core provided so as to form a closed magnetic circuit including an air gap (magnetic gap) and a magnetic sensor including a Hall IC disposed in the air gap of the core. Configured.

For example, as disclosed in Patent Document 1, such a current sensor employs a manufacturing method in which after a Hall IC is assembled to a case, the core is fitted into the case, and the core is fixed by enclosing the resin.
JP 2002-296305 A

  In this case, when the resin is encapsulated in the case or when the encapsulated resin is cured, the core fitted into the case may be displaced due to stress of the resin flowing in or stress at the time of curing.

  When the above-described misalignment of the core occurs, the distance between the core and the Hall IC changes, which causes a change in the output characteristics of the current sensor. For example, when the air gap dimension of the core is about several millimeters, if a positional deviation of about 0.5 to 1.0 mm occurs in the gap direction, a change in magnetic flux density of about 2 to 5% occurs, which results in output characteristics. Will vary greatly. In addition, when the positional deviation occurs in this way, in addition to the deviation of the output characteristic due to the positional deviation itself, the position may be easily affected by disturbance magnetism as an external factor. It will cause output fluctuation.

  The present invention has been made in consideration of the above circumstances. The purpose of the present invention is to reduce the positional deviation between the two as much as possible during assembly of the magnetic sensor and the core case to eliminate manufacturing variations and to change the output characteristics. It is an object of the present invention to provide a method of manufacturing a current sensor that can suppress the occurrence of the current as much as possible.

  According to the first aspect of the present invention, when the magnetic sensor is assembled to the case and the core is disposed, and the case is placed on the pallet in this state, one side surface portion of the case is aligned with the core attracting magnet of the pallet. Therefore, the core accommodated in the inside is attracted to and closely adhered to the core attracting magnet through the side wall of the case. As a result, the core is fixed without being displaced in the case, and the state in which the magnetic sensor is accurately positioned in the air gap portion of the core can be maintained. Since the resin is filled in the case in this state, it is possible to prevent the core from being displaced when the resin is filled, and the magnetic sensor and the core are sealed with the resin while being held at the regular positions. be able to.

  According to the invention of claim 2, in the above invention, since at least two core attracting magnets provided on the pallet are provided so as to correspond to the two side surfaces orthogonal to the case, the case is attracted to the core attracting magnet. In the process, when the magnetic sensor and the core are assembled to the case, the core can be held in a positioned state by bringing the two side surface portions of the case along the two core attracting magnets of the pallet. Thereby, since a core can be pulled in a positioning state in two directions in a case, an assembly precision can be raised more.

  According to the invention of claim 3, when the magnetic sensor is assembled to the case and the core is arranged, and the case is placed on the pallet in this state, the core in the case is embedded in the pallet via the bottom surface of the case. Since it is placed in a state of being attracted to the core attracting magnet, it is fixed so that the position of the core disposed in the case is not displaced, and the state in which the magnetic sensor is accurately positioned in the air gap portion of the core can be maintained. become. Since the resin is filled in the case in this state, it is possible to prevent the core from being displaced when the resin is filled, and the magnetic sensor and the core are sealed with the resin while being held at the regular positions. be able to.

  According to the invention of claim 4, when the magnetic sensor is assembled to the case and the core is disposed, and when the case is placed on the pallet in this state, one side surface portion of the case is in contact with the positioning portion of the pallet Then, the core is energized by the energizing means. As a result, as described above, the core is fixed in a state in which the core is not displaced in the case, and a state where the magnetic sensor is accurately positioned in the air gap portion of the core can be maintained.

  According to the invention of claim 5, the magnetic sensor is assembled to the case and the core is disposed, and in that state, the case is placed with the bottom face portion in contact with the inclined holding portion of the pallet, and the contained core is Since it is energized in the tilt direction to make it a one-sided state, and the upper surface of the case is covered with a resin sealing cover, the inside is filled with resin and the core and magnetic sensor are embedded and cured. As described above, the core is fixed in a state in which the core is not displaced in the case, and the state in which the magnetic sensor is accurately positioned in the air gap portion of the core can be maintained.

  According to the invention of claim 6, in the invention of claim 5 above, since the inclination angle of the inclination holding portion disposed on the pallet is provided so as to be perpendicular to the upper surface of the pallet, the case is placed. Sometimes the core can be positioned by contacting the side wall of the case with the total gravity of the core itself contained. As a result, the core is fixed without being displaced in the case, and the state in which the magnetic sensor is accurately positioned in the air gap portion of the core can be maintained.

  According to the invention of claim 7, in the invention of claim 6, since the core holding magnet is embedded in the inclined holding portion, when the case is placed on the pallet, the core in the case is side wall by its own weight. In addition to being brought into contact with the case, the magnet can be held in contact with the bottom surface of the case by using the core attracting magnet through the bottom surface of the case. The core is fixed in a state in which the core is not displaced, and the state in which the magnetic sensor is accurately positioned in the air gap portion of the core can be maintained.

  According to the invention of claim 8, in the invention of claim 1, the core attracting magnet provided on the pallet is provided so as to be able to be inserted into the through hole of the case, and when the case is placed on the pallet, the through hole of the case is Since the one side surface portion of the magnet is inserted through the attracting magnet, the core is fixed without being displaced in the case, so that the magnetic sensor can be accurately positioned in the air gap portion of the core. .

  According to the invention of claim 9, in each of the above inventions, when the core is in contact with the side wall inside the case, the core is positioned in contact with the two spaced apart positioning projections. Even if it is deformed due to bending or the like, the core position can be prevented from becoming unstable along the side wall of the case, so that the core can be surely positioned. It is possible to maintain the state where the position is accurately located.

  According to the invention of claim 10, in the case where the core attracting magnet is arranged on the pallet, the core attracting magnet is constituted by a permanent magnet, so that the core is assembled to the case while the pallet has a simple structure. And in the resin filling operation, the core can be fixed in a state in which the position of the core does not shift.

  According to the eleventh aspect of the present invention, in the case where the core attracting magnet is arranged on the pallet, the core attracting magnet is constituted by an electromagnet. Therefore, when the core arranged in the case needs to be attracted, the electromagnet By energizing, the core positioning state can be maintained, the degree of freedom of the process during assembly is increased, and workability can also be improved.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
1 and 2 show a front view and an exploded perspective view of the current sensor. 1 and 2, the current sensor 1 is formed in a state in which a magnetic sensor 4 including a core 3 and a Hall IC is accommodated in a rectangular container-like case 2 having an open upper surface, and the resin 2 is filled in the case 2. It has been done.

  The case 2 is formed so as to be surrounded by the outer peripheral wall 2 a, and a rectangular through hole 6 for inserting a current line to be detected is formed in the center portion, and surrounds the through hole 6. Thus, an inner peripheral wall 2b is formed. The core 3 forms a rectangular ring shape having portions spaced apart by a certain distance as the air gap 3a, and forms a closed magnetic circuit via the air gap 3a. The core 3 is formed by laminating a plurality of, for example, three magnetic plate materials 3a made of a plate material made of a magnetic material such as permalloy. The laminated magnetic plate members 3a are integrated by, for example, caulking means, but may be integrated by an adhesive formed of a high magnetic permeability material.

  A current line through which the current to be measured flows is arranged so as to pass through the center of the core 3, and a magnetic flux is linked to the closed magnetic path via the core 3 and the air gap 3 a by the current flowing through the current line, The magnetic flux density is detected by the magnetic sensor 4 disposed in the air gap 3a, and the magnitude of the current proportional to the detected magnetic flux density is detected. The magnetic sensor 4 is disposed so as to be positioned at the center of the air gap 3 a portion of the core 3.

  The thickness dimension of the magnetic sensor 4 is smaller than the gap dimension G of the air gap 3a, but is slightly exaggerated in FIG. Further, the core 3 is disposed so as to be in close contact with the inner surface of the outer peripheral wall 2a on the right side of the case 2 because of an assembly relationship described later. In this state, the magnetic sensor 4 is in the center of the gap dimension G of the air gap 3a. That is, the gap dimension between the part and the part facing the air gap 3a of the core 3 is substantially the same. Here, in the case 2 in which the core 3 is accommodated, a gap of the dimension S1 is formed in the case 2 between the outer peripheral wall 2a and the outer peripheral wall facing the outer wall 2a. Yes, here is exaggerated.

  FIG. 1 shows a flat pallet 7 used for flowing the assembly line when the current sensor 1 is assembled, and a rectangular long plate used for assembly described later on the upper surface thereof. The core attracting magnet 8 having a shape is fixed so as to protrude. In the illustrated state, the core 3 is attracted by the core attracting magnet 8.

Next, the assembly process of the current sensor 1 having the above-described configuration will be briefly described with reference to FIGS.
First, as shown in FIG. 3, the magnetic sensor 4 is assembled in the case 2. The case 2 is moved on the production line while being placed on the pallet 7, and when the magnetic sensor 4 comes to the assembly position, the magnetic sensor 4, that is, the Hall IC is arranged at a predetermined position in the case 2, and leads (not shown) The terminal is fixed by soldering or welding. At this time, the lead terminal of the magnetic sensor 4 can be electrically connected to an external terminal.

  Second, the core 3 is accommodated in the case 2. At this time, the core 3 is not yet fixed and is slightly misaligned due to the gap with the case 2, but the core attracting magnet 8 of the pallet 7 and the outer peripheral wall 2 a portion of the case 2 are interposed. Since it is adsorbed so as to be in an intimate contact state, it is held in an adsorbed state so that positional displacement does not occur when it is placed on the pallet 7. When the core 3 is held in this state, the magnetic sensor 4 is set so as to be positioned at the center of the air gap 3a of the core 3.

  Thirdly, the resin 5 is poured into the case 2 in the above-described state, filled to a predetermined height where the core 3 is sufficiently filled, and cured. At this time, since the core 3 is held in close contact with the outer peripheral wall 2 a of the case 2 by the core attracting magnet 8 of the pallet 7, the resin 5 is cured at that position without causing positional displacement, and the core 3 The state located in the center part of the air gap 3a is maintained.

  According to the present embodiment, since the current sensor 1 is assembled as described above, even when the core 3 is housed in the case 2, it is manufactured without causing a displacement in the filling and curing process of the resin 5. can do. As a result, it is possible to manufacture products with uniform quality by suppressing the occurrence of variations in output characteristics due to the misalignment of the core 3 between products.

  In addition, since the magnetic sensor 4 can be reliably disposed at a predetermined position in the center of the air gap 3a of the core 3, it is possible to prevent the magnetic sensor 4 from being easily affected by disturbance magnetism, and output fluctuation. Generation can also be reduced.

(Second Embodiment)
FIG. 5 shows a second embodiment of the present invention. The difference from the first embodiment is that a pallet 7 used for assembly is provided with a core attracting magnet 10 in addition to the core attracting magnet 8. is there. As shown in FIG. 5, the core attracting magnet 8 is provided corresponding to the outer peripheral wall 2a of the case 2, whereas the core attracting magnet 8 is provided so as to correspond to the lower outer peripheral wall 2c orthogonal to the outer peripheral wall 2a. A magnet 10 is provided.

  When the core 3 is housed in the case 2, the core attracting magnets 8 and 10 of the pallet 7 attract the right side surface and the lower side surface of the core 3 through the outer peripheral walls 2 a and 2 c of the case 2, respectively. . As a result, the core 3 is held in the case 2 in close contact with both of the outer peripheral walls 2a and 2c, and the resin 5 is cured at that position without causing a positional shift when the resin 5 is filled. The state located in the center part of the air gap 3a is maintained. Even when there is a lateral gap dimension S1 or a longitudinal gap dimension S2 when the core 3 is accommodated in the case 2, positioning can be performed without being affected by this.

  According to the second embodiment as described above, in addition to the effects of the first embodiment, the positioning is ensured without causing any displacement in the direction perpendicular to the gap interval direction of the air gap 3a of the core 3. The sealing process of the resin 5 can be implemented in the state. Thereby, the magnetic sensor 4 arrange | positioned in the air gap 3a part of the core 3 can be positioned correctly, and the dispersion | variation in output characteristic can be reduced reliably and the improvement of quality can be aimed at.

(Third embodiment)
FIG. 6 shows a third embodiment of the present invention. The difference from the first embodiment is that a core adsorption made of an electromagnet instead of a core adsorption magnet 8 made of a permanent magnet is placed on a pallet 7 for assembly. This is the point that a magnet 11 is provided. In the core attracting magnet 11, a current-carrying terminal 11a is led out of the pallet 7, and power is supplied from the outside through the terminal 11a in the assembly process.

  Other configurations and assembly methods are almost the same, but according to this embodiment, when the core 3 is accommodated in the case 2, an attractive force is generated by supplying power to the core attracting magnet 11 in a positioned state. Therefore, the workability can be improved.

(Fourth embodiment)
FIG. 7 shows a fourth embodiment of the present invention. The difference from the second embodiment is that a core made of electromagnets is used instead of core attracting magnets 8 and 10 made of permanent magnets on an assembly pallet 7. The attraction magnets 11 and 12 are provided. In the core attracting magnets 11 and 12, current-carrying terminals 11a and 12a are led out of the pallet 7, and power is supplied from the outside through the terminals 11a and 12a in the assembly process, respectively. .

According to such 4th Embodiment, in addition to the effect of 2nd Embodiment, the effect similar to 3rd Embodiment can also be acquired.
(Fifth embodiment)
8 and 9 show a fifth embodiment of the present invention. The difference from the first embodiment is that it is embedded in the upper surface of the pallet 7 instead of the core attracting magnet 8 provided on the pallet 7. A permanent magnet core adsorbing magnet 13 is provided.

  In the assembly process, when the case 2 is placed on the pallet 7 while the core 3 is housed in the case 2, the core 3 is attracted by the core attracting magnet 13 embedded in the pallet 7 via the bottom surface of the case 2. Therefore, the core 3 is held in a state fixed in the case 2. As a result, the resin 5 can be manufactured without misalignment in the filling and curing process, and the quality is uniform by suppressing the variation in output characteristics caused by the misalignment of the core 3 between products. Can be manufactured.

(Sixth embodiment)
FIG. 10 shows a sixth embodiment of the present invention. The difference from the fifth embodiment is that an electromagnet core attracting magnet 14 is used instead of the core attracting magnet 13 embedded in the pallet 7. It has just been established. Accordingly, when the core 3 is placed in the case 2 and placed on the pallet 7 and the terminal 14a of the core attracting magnet 14 is energized, the core 3 is attracted and fixed.

(Seventh embodiment)
11 and 12 show a seventh embodiment of the present invention. The difference from the first embodiment is that a positioning portion 15 for positioning the case 2 on the pallet 7 instead of the core attracting magnet 8 is shown. And the core pressing device 16 are provided.

  The positioning portion 15 is provided as a long projection so that the outer peripheral wall 2aa opposite to the outer peripheral wall 2a abuts when the case 2 is placed on the pallet 7, and the core pressing device 16 is 2, the core 3 accommodated in the case 2 is pressed from the outer peripheral wall 2a side and pressed against the positioning portion 15 side to be held in a fixed state. In the core pressing device 16, a support portion 16a is fixed to the pallet 7, and a pressing member 16c including a pressing bar and a pressing plate is movably attached thereto by a spring 16b. The holding member 16c is configured to be urged in the left direction (arrow A direction) in the drawing by a spring 16b.

  In this embodiment, a case in which a rectangular notch 2d is formed on the outer peripheral wall 2a of the case 2 so as to be pressed by the pressing member 16c is used. In the assembly process, when the core 3 is accommodated in the case 2 and placed on the pallet 7, the case 2 is brought into contact with the positioning portion 15. Thereafter, the right end surface portion of the core 3 in the case 2 is urged toward the positioning portion 15 by the spring 16b of the core pressing device 16 and fixed.

  Thereafter, the resin 5 is injected into the case 2 and hardened. At this time, since the notch 2d is formed in the case 2 in filling the resin 5, the height of the notch 2d is exceeded. It is poured and cured so that the resin 5 does not overflow in the range. After removing the pressing member 16c, if necessary, the notch 2d is further sealed with another member or the like, and the resin 5 is additionally injected so that the entire core 3 is covered. By curing, it can be surely formed in a state sealed with the resin 5.

(Eighth embodiment)
FIG. 13 shows an eighth embodiment of the present invention. The difference from the seventh embodiment is that a core pressing device 17 is provided on the pallet 7 instead of the core pressing device 16. The core pressing device 17 includes a supporting member 17a, a spring 17b, a pressing bar, and a pressing member 17c including a pressing plate as described above. The holding member 17c is formed so that the tip portion is bent downward and the cross section is L-shaped.

  Further, in this embodiment, the outer peripheral wall 2a portion of the case 2 does not need the notch portion 2d unlike the seventh embodiment, and the tip portion of the pressing member 17c is inserted into the case 2 beyond the outer peripheral wall 2a. The core 3 is pressed against the side surface. Also in this case, after the resin 5 is filled and cured, the portion of the portion from which the pressing member 17c is taken out that is not filled with resin may be filled again with resin 5 as necessary.

  In the eighth embodiment as well, in addition to the same effects as those of the seventh embodiment, it is not necessary to form the notch 2d in the case 2 by using the core pressing device 17, so that the resin 5 The filling operation can be performed easily and quickly.

(Ninth embodiment)
FIG. 14 shows a ninth embodiment of the present invention. The difference from the first embodiment is that the pallet 7 is provided with an inclined holding portion 18 instead of the core attracting magnet 8. The inclined holding portion 18 has an inclined surface portion 18 a having a surface inclined at a predetermined angle so as to receive the bottom surface of the case 2 and a positioning portion 18 b that contacts the outer peripheral wall 2 a of the case 2 for positioning on the surface of the pallet 7. It is already made.

  In the assembly process, when the case 2 is placed on the inclined holding portion 18 with the core 3 housed in the case 2, the outer peripheral wall 2a of the case 2 is held in contact with the positioning portion 18b. At this time, the core 3 accommodated in the case 2 comes to be held in the positioning state by contacting the outer peripheral wall 2a with its own weight.

  In this state, the lid 19 is attached so as to cover the upper surface of the case 2. The lid 9 is made of a material subjected to fluorine processing or the like as a material that does not adhere when the resin is cured. Further, the lid 19 is in a state where a slight gap S for resin injection is opened on the outer peripheral wall 2aa side. By injecting the resin 5 from the gap S and curing it, it becomes possible to manufacture a product with high positioning accuracy.

(Tenth embodiment)
FIG. 15 shows a tenth embodiment of the present invention. The difference from the ninth embodiment is that the pallet 7 is provided with an inclination holding portion 20 having an inclination angle of the inclination holding portion 18 of 90 degrees. That's right. Also with this configuration, the same effects as those of the ninth embodiment can be obtained in the assembly process. In addition, since all of the weight of the core 3 is used as a positioning component, it is possible to perform assembling with no positional deviation.

(Eleventh embodiment)
FIG. 16 shows an eleventh embodiment of the present invention. The difference from the tenth embodiment is that a core attracting magnet 21 is embedded in an inclined holding portion 20 provided on the pallet 7. By the way. Accordingly, when the bottom surface of the case 2 is brought into contact with the inclined holding portion 20 of the pallet 7 with the core 3 being accommodated in the case 2, the core 3 is adsorbed via the bottom surface of the case 2, so that the case 2 It is possible to prevent the core 3 from being displaced in the depth direction.

(Twelfth embodiment)
FIGS. 17 and 18 show a twelfth embodiment of the present invention. The difference from the first embodiment is that a pallet 7 is provided with a core attracting magnet 22 instead of the core attracting magnet 8. By the way. The core attracting magnet 22 has such a length and size that it can be inserted into the through hole 6 of the case 2 and is sized and shaped so as to come into contact with, for example, the left inner peripheral wall 2 b in the through hole 6.

  In the assembly process, with the core 3 housed in the case 2, the core adsorption magnet 22 of the pallet 7 is placed so as to pass the through hole 6 of the case 2. At this time, when the inner peripheral wall 2b on the left side of the through hole 6 of the case 2 is positioned so as to contact the core attracting magnet 22, the core 3 is attracted through the inner peripheral wall 2b and held in the positioned state. In this state, the magnetic sensor 4 is set to be positioned at the center of the air gap 3a of the core 3.

  According to the twelfth embodiment, the same effect as that of the first embodiment can be obtained, and the core attracting magnet 22 provided on the pallet 7 is small and corresponds to the through hole 6 of the case 2. Therefore, it can be made compact without increasing the necessary area of the pallet 7.

(13th Embodiment)
19 and 20 show a thirteenth embodiment of the present invention. The difference from the above embodiments is that the positioning projections 23a to 23d are provided inside the outer peripheral walls 2a and 2c of the case 2. FIG. is there. In addition, as a structure of the pallet 7, any one of the above embodiments can be used.

  As shown in FIG. 19, positioning protrusions 23 a to 23 d having pointed tips are brought into contact with the side surfaces of the core 3 on the inner surfaces of the outer peripheral walls 2 a and 2 c of the case 2. It is provided so that it can.

  In the above-described configuration, even if the outer peripheral walls 2a, 2c, etc. are deformed through the processing steps such as heat treatment, as shown in FIG. It is possible to maintain the contact with the positioning protrusions 23a to 23d at points without changing the contact form. As a result, it is possible to manufacture a device having stable output characteristics by suppressing the occurrence of displacement due to the deformation of the case 2 as much as possible.

(Other embodiments)
The present invention is not limited to the above embodiment, and can be modified or expanded as follows.

In the fifth embodiment, one core attracting magnet 13 provided on the pallet is provided. However, a plurality of core attracting magnets 13 may be embedded.
In the ninth embodiment, a configuration may be adopted in which a permanent magnet or an electromagnet core attracting magnet is embedded in the inclined holding portion 18.

  In the eleventh embodiment, the core attracting magnet 21 provided in the inclined holding portion 20 may be a permanent magnet or an electromagnet. A plurality of them can also be provided.

  In the twelfth embodiment, the core attracting magnet 22 is configured to come into contact with one side surface portion of the through hole 6, but a core attracting magnet may be provided so as to correspond to two orthogonal side surfaces.

The top view of the whole structure which shows the 1st Embodiment of this invention Disassembled perspective view of current sensor External perspective view showing one stage of assembly process (Part 1) External perspective view showing one stage of assembly process (Part 2) The top view of the whole structure which shows the 2nd Embodiment of this invention The top view of the whole structure which shows the 3rd Embodiment of this invention The top view of the whole structure which shows the 4th Embodiment of this invention The longitudinal cross-sectional view of the whole structure which shows the 5th Embodiment of this invention External perspective view showing the configuration of the pallet Longitudinal sectional view of the entire configuration showing a sixth embodiment of the present invention The top view of the whole structure which shows the 7th Embodiment of this invention External perspective view showing one stage of assembly process External appearance perspective view which shows one step of the assembly process which shows the 8th Embodiment of this invention The longitudinal cross-sectional view of the whole structure which shows the 9th Embodiment of this invention The longitudinal cross-sectional view of the whole structure which shows the 10th Embodiment of this invention A longitudinal sectional view of an overall configuration showing an eleventh embodiment of the present invention The top view of the whole structure which shows the 12th Embodiment of this invention Longitudinal section The top view of the whole structure which shows the 13th Embodiment of this invention Plan view of the overall configuration for explaining the operation

Explanation of symbols

  In the drawings, 1 is a current sensor, 2 is a case, 3 is a core, 3a is an air gap, 4 is a magnetic sensor, 5 is a resin, 6 is a through hole, 7 is a pallet, 8, 10, 11, 12, 13, 14 , 21 and 22 are magnets for attracting the core, 16 and 17 are core pressing devices, 18 and 20 are inclined holding portions, 19 is a lid, and 23a to 23d are positioning projections.

Claims (11)

A core provided so as to form a closed magnetic path including an air gap; a magnetic sensor disposed in the air gap; and a through-hole for accommodating the core and the magnetic sensor and through which a current line passes. In the method of manufacturing a current sensor comprising a case, the current line through which the current to be measured flows is arranged in a form penetrating the core.
The pallet used for assembly is provided with a core attracting magnet that also serves as a positioning on the surface on which the case is placed,
The magnetic sensor is assembled to the case and the core is disposed, and the case is placed so that one side of the case is placed along the core attracting magnet of the pallet, and the core is placed on one side of the case. A step of adsorbing the core adsorbing magnet in a state through a section;
A method of manufacturing a current sensor comprising: filling the case with a resin and curing the core and the magnetic sensor in a state of being embedded. In the manufacturing method of the current sensor according to claim 1,
Providing at least two core attracting magnets to be provided on the pallet so as to correspond to two orthogonal side surfaces of the case;
In the step of attracting to the core attracting magnet, the magnetic sensor and the core are assembled to the case, and the two side surfaces of the case are placed along the core attracting magnet of the pallet. The core is attracted to the core attracting magnet at the respective surface portions via the two side surface portions of the case. A core provided so as to form a closed magnetic path including an air gap; a magnetic sensor disposed in the air gap; and a through-hole for accommodating the core and the magnetic sensor and through which a current line passes. A current sensor having a configuration, wherein the current line through which the current to be measured flows is arranged in a form penetrating the core;
In the pallet used for assembly, a core adsorbing magnet is embedded and arranged on the surface on which the case is placed,
The magnetic sensor is assembled to the case and the core is disposed, the case is placed at a position where the core attracting magnet is embedded in the pallet, and the core is placed through the bottom surface of the case. A process of adsorbing to a core adsorbing magnet;
A method of manufacturing a current sensor comprising: filling the case with a resin and curing the core and the magnetic sensor in a state of being embedded. A core provided so as to form a closed magnetic path including an air gap; a magnetic sensor disposed in the air gap; and a through-hole for accommodating the core and the magnetic sensor and through which a current line passes. A current sensor having a configuration, wherein the current line through which the current to be measured flows is arranged in a form penetrating the core;
A positioning portion for contacting one side surface portion of the case with a pallet used for assembly; and a biasing means for biasing the side surface of the core toward the positioning portion side while the case is in contact with the positioning portion. Arrange
Assembling the magnetic sensor in the case and arranging the core, placing the case in contact with the positioning portion of the pallet, and placing the core in a state of being biased by the biasing means;
A method of manufacturing a current sensor, comprising: filling the case with a resin and curing the core and the magnetic sensor in a state of being embedded. A core provided so as to form a closed magnetic path including an air gap; a magnetic sensor disposed in the air gap; and a through-hole for accommodating the core and the magnetic sensor and through which a current line passes. A current sensor having a configuration, wherein the current line through which the current to be measured flows is arranged in a form penetrating the core;
The pallet used for assembly is provided with an inclined holding portion that holds the bottom portion of the case in an inclined state,
A state in which the magnetic sensor is assembled to the case and the core is disposed, and the case is placed with the bottom surface portion of the case in contact with the inclined holding portion of the pallet and the core is biased in the inclined direction. And a process of
A current sensor comprising a step of covering the upper surface of the case with a resin sealing cover and filling the resin inside to harden the core and the magnetic sensor. Production method. In the manufacturing method of the current sensor according to claim 5,
The method of manufacturing a current sensor, wherein the inclination holding portion disposed on the pallet is provided so that an inclination angle thereof is perpendicular to an upper surface of the pallet. In the manufacturing method of the current sensor according to claim 6,
The method of manufacturing a current sensor, wherein the inclined holding portion is configured to have a core attracting magnet that attracts the core when the bottom surface portion of the case comes into contact therewith. In the manufacturing method of the current sensor according to claim 1,
The core attracting magnet provided on the pallet is provided so as to be able to be inserted into the through hole of the case,
In the step of attracting the core to the core attracting magnet, the core is placed by placing a through-hole of the case through the core attracting magnet in the pallet so that one side surface portion thereof is along the core. Is attracted to the core attracting magnet via a side surface portion of the through hole of the case. In the manufacturing method of the current sensor according to any one of claims 1 to 8,
2. The method of manufacturing a current sensor according to claim 1, wherein the case is provided with two positioning projections separated from each other on a surface portion of the inner side wall that contacts the core. In the manufacturing method of the current sensor according to any one of claims 1 to 3, 7 to 9,
The method of manufacturing a current sensor, wherein the core attracting magnet is a permanent magnet. In the manufacturing method of the current sensor according to any one of claims 1 to 3, 7 to 9,
The method of manufacturing a current sensor, wherein the core attracting magnet is an electromagnet.

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