JP5587856B2 - Current detector - Google Patents

Description

  The present invention relates to a current detector that detects the magnitude of current using a magnetoelectric transducer such as a Hall element.

Conventionally, as a current detector, as shown in FIG. 24, a core (102) having a magnetic gap portion (103) in a housing chamber (105) formed inside an exterior case (104), and a Hall element (101 And a circuit board (100) mounted with a Hall element (101) in a magnetic gap part (103) of a core (102) is known.
When a current passes through the hollow portion of the core (102) by energization, the magnitude of the current is detected by the Hall element (101).

  In the assembly process of such a current detector, the core (102) and the circuit board (100) are accommodated in the accommodating chamber (105) of the outer case (104), and then the synthetic resin (for example, epoxy) is accommodated in the accommodating chamber (105). The core (102) is fixed in the outer case (104) by filling (resin) (see Patent Document 1).

  However, by filling the housing (105) of the outer case (104) with the synthetic resin, the core (102) is entirely covered with the synthetic resin, and in such a current detector, at the time of resin molding When the core (102) receives an external force from the surrounding synthetic resin, there is a problem that a large hysteresis occurs in the relationship (BH curve) between the coercive force (Hc) and the residual magnetic flux density (Br).

  Therefore, the applicant applies an integral core component in which the mold resin portion covering the surface of the core over a part of the total length along the magnetic path of the core is formed at one or a plurality of locations along the magnetic path. A current detector configured to accommodate the core component in an outer case has been proposed (Patent Document 2).

  According to such a current detector, since the core component is only covered by the mold resin portion of the entire length along the magnetic path of the core, the core is molded from the mold resin portion. Sometimes the force received from the surroundings is relatively small, which suppresses an increase in core hysteresis.

JP 2006-78255 A JP 2011-153935 A

  However, in the current detector using the core component in which a part of the total length along the magnetic path of the core is covered with the mold resin part, the core is in the expansion direction and / or the reduction direction of the magnetic gap part. May be deformed.

For example, when a wound core formed by winding a magnetic strip in a loop shape is used, the stress generated in the manufacturing process remains in the core, and the core remains due to long-term use of the current detector. There is a possibility that the magnetic gap portion is gradually deformed in the expanding direction under the influence of stress.
Further, when the core temperature rises due to energization or the core temperature fluctuates due to environmental influences, the core may be deformed.

  In the current detector, since the length (gap length) G of the magnetic gap part (103) of the core (102) has a great influence on the output of the Hall element (101), the core is deformed and the gap length G varies. In this case, the current detection accuracy is lowered.

  Therefore, an object of the present invention is to provide a current detector that can suppress an increase in the hysteresis of the core and prevent a variation in the gap length.

The current detector according to the present invention comprises an annular core (11) having a magnetic gap part (111), and a magnetoelectric conversion element located in the magnetic gap part (111) of the core (11),
The core (11) has a mold resin portion (2) covering the surface of the core (11) over a part of the total length along the magnetic path, at one or a plurality of positions along the magnetic path. Molded to form an integral core component (1)
Of the mold resin portions (2) formed at one or a plurality of locations, one mold resin portion (2) is formed across the magnetic gap portion (111) of the core (11) to form a magnetic gap portion ( 111), and the pair of mold resin bodies is larger than the material of the mold resin portion (2) with respect to expansion and / or reduction of the magnetic gap portion (111). They are connected to each other via a connecting member made of a material that exhibits resistance.

  The core is, for example, a wound core formed by winding a magnetic strip in a loop shape.

  In the above current detector, the core component (1) is only partially covered by the mold resin portion (2) of the entire length along the magnetic path of the core (11). The force that (11) receives from the surroundings at the time of molding the mold resin portion (2) is relatively small, thereby suppressing an increase in the hysteresis of the core (11).

  Further, a pair of mold resin bodies constituting the mold resin portion (2) is formed across the magnetic gap portion (111) of the core (11) and is located on both sides of the magnetic gap portion (111). The pair of mold resin bodies are connected to each other by a connecting member that exhibits a greater resistance than the mold resin portion (2) against the expansion and / or reduction of the magnetic gap portion (111). The fluctuation of the gap length of the magnetic gap part (111) is suppressed by the resistance force.

In a specific aspect, the connecting member is formed of a material that is less deformed by the action of an external force than the material of the mold resin portion.
This suppresses the core (11) from being deformed by the action of an external force.

The connecting member is made of a material that is smaller in thermal deformation than the material of the mold resin portion.
This suppresses the core (11) from being deformed by a temperature change.

The connecting member is a substrate (12) on which the magnetoelectric transducer is mounted.
Here, the pair of mold resin bodies and the substrate (12) are connected to each other by an uneven fitting structure.
Therefore, the pair of mold resin bodies are connected to the substrate (12) by the step of mounting the core component (1) on the substrate (12).

The connecting member is an exterior case (17) that houses the core component (1).
Here, the pair of mold resin bodies and the outer case are connected to each other by an uneven fitting structure.
Accordingly, the pair of molded resin bodies are connected to the outer case (17) by the step of housing the core component (1) in the outer case (17).

  In a more specific aspect, the pair of mold resin bodies are formed by molding a synthetic resin on a part of the core and then cutting the synthetic resin together with the core in a direction crossing the magnetic path of the core, The cut surface of the synthetic resin is aligned with the end surface (cut surface) of the core facing the magnetic gap portion.

  According to the specific embodiment, the synthetic resin is molded into a part of the core in the manufacturing process, and then the synthetic resin is cut together with the core in a direction crossing the magnetic path of the core to thereby form a pair of molded resin bodies and the magnetic gap. Therefore, even if the core (11) is a wound core, the magnetic strip constituting the core (11) is not peeled off or burred even when the core (11) is a wound core.

  According to the current detector of the present invention, it is possible to suppress an increase in the hysteresis of the core and to prevent the gap length from changing, thereby realizing highly accurate current detection.

FIG. 1 is a front view of a current detector according to the first embodiment of the present invention. FIG. 2 is an exploded front view of the current detector. FIG. 3 is a front view of a current detector according to the second embodiment of the present invention. FIG. 4 is an exploded front view of the current detector. FIG. 5 is a front view of a current detector according to the third embodiment of the present invention. FIG. 6 is a bottom view of the current detector. FIG. 7 is a front view of a core component constituting the current detector. FIG. 8 is an exploded bottom view of the current detector. FIG. 9 is a front view of a current detector according to the fourth embodiment of the present invention. FIG. 10 is an exploded front view of the current detector. FIG. 11 is a front view of a current detector according to the fifth embodiment of the present invention. FIG. 12 is a side view of the current detector. FIG. 13 is an exploded front view of the current detector. FIG. 14 is an exploded side view of the current detector. FIG. 15 is a front view of a current detector according to the sixth embodiment of the present invention. FIG. 16 is an exploded front view of the current detector. FIG. 17 is a front view of a current detector according to the seventh embodiment of the present invention. FIG. 18 is a cross-sectional view of the current detector. FIG. 19 is an exploded front view of the current detector. FIG. 20 is a partially broken exploded side view of the current detector. FIG. 21 is a front view of a current detector according to the eighth embodiment of the present invention. FIG. 22 is an exploded front view of the current detector. FIG. 23 is a partially broken exploded side view of the current detector. FIG. 24 is a partially broken front view of a conventional current detector.

  Hereinafter, eight embodiments of the present invention will be specifically described with reference to the drawings. In the description of each embodiment, a duplicate description is omitted as appropriate.

  In the current detector according to the first embodiment, as shown in FIGS. 1 and 2, the core component (1) is mounted on the circuit board (12) on which the Hall element (10) is mounted.

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) has a predetermined gap length on a core portion corresponding to one side of the quadrilateral. A magnetic gap portion (111) having G is formed.
A Hall element (10) is interposed in the magnetic gap part (111).

  The core portion of the core (11) is formed with a mold resin portion (2) that covers the outer peripheral surface of the core portion. The mold resin part (2) is composed of a pair of mold resin bodies (20) and (20) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111).

  As shown in FIG. 2, a pair of hook pieces (21) and (21) and a pair of positioning pins (22) and (22) protrude from the bottom surfaces of the pair of mold resin bodies (20) and (20). Yes. On the other hand, a pair of hook receiving holes (13) and (13) with which the hook pieces (21) and (21) are engaged, and the positioning pins (22) and (22) are closely fitted in the circuit board (12). A pair of positioning holes (14) and (14) are opened.

The manufacturing process of the core component (1) includes a first step of winding a silicon steel plate to be the core (11) in a loop shape, and a second step of molding a synthetic resin to be the mold resin portion (2). The synthetic resin is cut together with the core to form a pair of mold resin bodies (20) and (20) and to form a magnetic gap portion (111).
According to the manufacturing process, since the core is covered with the synthetic resin at the time of cutting in the third process, the silicon steel plate constituting the core is not peeled off or burred.

  In the core component (1) obtained by the manufacturing process, both end surfaces (cut surfaces) of the pair of mold resin bodies (20) and (20) facing each other across the magnetic gap portion (111) are the core (11). Both end surfaces (cut surfaces) of the magnetic gap portion (111) are aligned on the same plane.

In the assembly process of the current detector, the core part (1) is pressed toward the circuit board (12), and the hook pieces (21) and (21) of the core part (1) are hooked into the hook receiving holes of the circuit board (12). (13) Engage with (13). Along with this, the positioning pins (22) and (22) of the core component (1) are closely fitted into the positioning holes (14) and (14) of the circuit board (12).
As a result, the core component (1) is held on the circuit board (12) and the magnetic gap portion (by the close fitting of the positioning pins (22), (22) and the positioning holes (14), (14)). 111) is defined as a predetermined gap length G.

  In the above current detector, the core component (1) is only partially covered by the mold resin portion (2) of the entire length along the magnetic path of the core (11). The force that 11) receives from the surroundings when the mold resin part (2) is molded is relatively small, and this suppresses an increase in the hysteresis of the core (11).

In addition, the circuit board (12) exhibits a greater resistance to expansion and contraction of the magnetic gap part (111) than the material of the mold resin part (2). Even if the core (11) is deformed in the expansion or contraction direction due to changes in the environment (temperature and humidity), the deformation is prevented by the resistance of the circuit board (12), and the gap length G of the magnetic gap part (111) Fluctuations will be prevented.
Therefore, highly accurate current detection is realized.

  In the current detector of the second embodiment, as shown in FIGS. 3 and 4, the core component (1) is mounted on the circuit board (12) on which the Hall element (10) is mounted.

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) has a predetermined gap length on a core portion corresponding to one side of the quadrilateral. The magnetic gap part (111) which has is formed.
A Hall element (10) is interposed in the magnetic gap part (111).

  A mold resin part (3) is formed on the core part of the core (11) to cover the outer peripheral surface of the core part. The mold resin part (3) is composed of a pair of mold resin bodies (30) (30) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111).

As shown in FIG. 4, a pair of left and right flange portions (31) and (31) are projected on both side surfaces of the pair of mold resin bodies (30) and (30). Each has a through hole (32) (32). On the other hand, the circuit board (12) has a pair of screw holes (15) and (15) at positions corresponding to the through holes (32) and (32).
Then, two screws (33) and (33) penetrate tightly into the pair of through holes (32) and (32) of the mold resin portion (3) installed on the circuit board (12). ) (33) are screwed into the screw holes (15) and (15) of the circuit board (12).

In the assembly process of the current detector, the two screws (33) and (33) are respectively inserted into the pair of through holes in the mold resin portion (3) with the core component (1) placed on the circuit board (12). (32) Screw into the screw holes (15) and (15) of the core (11) from the (32).
As a result, the core component (1) is fixed on the circuit board (12), and the pair of mold resin bodies (30) and (30) are connected to each other via the circuit board (12).

In the above current detector, the circuit board (12) exhibits a greater resistance to expansion and contraction of the magnetic gap part (111) than the material of the mold resin part (2). Even if the core (11) does not deform in the expansion or contraction direction due to changes over time or changes in the environment, the deformation is prevented by the resistance of the circuit board (12), and the gap length of the magnetic gap part (111) varies. Will be blocked.
Therefore, highly accurate current detection is realized.

  In the current detector of the third embodiment, as shown in FIGS. 5 and 6, the circuit board (12) on which the Hall element (10) is mounted is installed in a vertical posture orthogonal to the second embodiment. A core component (1) is attached to the surface of the circuit board (12).

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) includes a magnetic gap portion ( 111) is formed.
A Hall element (10) is interposed in the magnetic gap part (111).

  The core portion of the core (11) is formed with a mold resin portion (4) that covers the outer peripheral surface of the core portion. The mold resin part (4) includes a pair of mold resin bodies (40) (40) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111).

As shown in FIGS. 7 and 8, a pair of screw holes (41) and (41) are formed on both sides of the pair of mold resin bodies (40) and (40).
Further, as shown in FIG. 8, the circuit board (12) has a pair of through holes (121) and (121) at positions corresponding to the screw holes (41) and (41).
The two screws (42) and (42) tightly penetrate the through holes (121) and (121) of the core (11), and the tip portions thereof are screw holes of the mold resin bodies (40) and (40), respectively. 41) Screwed into (41).

  In the current detector, a pair of mold resin bodies (40) (40) are fastened to the circuit board (12) by screws (42) (42), whereby the mold resin bodies (40) (40) are They are connected to each other via the circuit board (12).

As a result, even if the core (11) does not deform in the expansion direction or contraction direction due to changes over time of the core (11) or environmental changes, the deformation is prevented by the resistance of the circuit board (12), and the magnetic gap portion ( 111) gap length variation is prevented.
Therefore, highly accurate current detection is realized.

  In the current detector of the fourth embodiment, as shown in FIGS. 9 and 10, the core component (1) is attached on the circuit board (12) on which the Hall element (10) is mounted.

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) includes a magnetic gap portion ( 111) is formed.
A Hall element (10) is interposed in the magnetic gap part (111).

  The core portion of the core (11) is formed with a mold resin portion (5) that covers the outer peripheral surface of the core portion. The mold resin part (5) is composed of a pair of mold resin bodies (50) (50) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111).

  A pair of left and right flanges (51) (51) are projected from both ends of the pair of mold resin bodies (50) (50), and pins ( 52) (52) is projected, and the pins (52) (52) penetrate the pair of through holes (16) (16) of the circuit board (12) closely, and at the tip thereof as shown in FIG. The welded portions (53) and (53) are formed, and the pins (52) and (52) are prevented from coming off.

In the current detector, the pair of mold resin bodies (50), (50) are connected to each other via the circuit board (12).
As a result, even if the core (11) does not deform in the expansion direction or contraction direction due to changes over time of the core (11) or environmental changes, the deformation is prevented by the resistance of the circuit board (12), and the magnetic gap portion ( 111) gap length variation is prevented.
Therefore, highly accurate current detection is realized.

  In the current detector of the fifth embodiment, as shown in FIGS. 11 and 12, the circuit board (12) on which the Hall element (10) is mounted is installed in a vertical posture orthogonal to the fourth embodiment. A core component (1) is attached to the circuit board (12).

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) includes a magnetic gap portion ( 111) is formed.
An end portion of the circuit board (12) and the Hall element (10) are interposed in the magnetic gap portion (111).

  The core portion of the core (11) is formed with a mold resin portion (6) that covers the outer peripheral surface of the core portion. As shown in FIG. 13, the mold resin part (6) is composed of a pair of mold resin bodies (60) (60) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111). Yes.

As shown in FIG. 14, the pair of mold resin bodies (60), (60) protrudes in opposite directions in the direction parallel to the winding axis of the core (11). A pair of screw holes (62) (62) is formed at the protruding end.
Then, the two screws (61) (61) closely penetrate the through holes (not shown) of the core (11), and the tip portions thereof are molded resin bodies (60) (60) as shown in FIGS. Screw holes (62) and (62).

  In the current detector, a pair of mold resin bodies (60) (60) are fastened to the circuit board (12) by screws (61) (61), whereby the mold resin bodies (60) (60) are They are connected to each other via the circuit board (12).

As a result, even if the core (11) does not deform in the expansion direction or contraction direction due to changes over time of the core (11) or environmental changes, the deformation is prevented by the resistance of the circuit board (12), and the magnetic gap portion ( 111) gap length variation is prevented.
Therefore, highly accurate current detection is realized.

  As shown in FIGS. 15 and 16, the current detector of the sixth embodiment is a circuit board (with a core component (1) and a hall element (10) mounted inside a synthetic resin outer case (17)). 12) and is housed.

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) has a predetermined gap length on a core portion corresponding to one side of the quadrilateral. The magnetic gap part (111) which has is formed.
A Hall element (10) is interposed in the magnetic gap part (111).

The core portion of the core (11) is formed with a mold resin portion (7) that covers the outer peripheral surface of the core portion. The mold resin part (7) is composed of a pair of mold resin bodies (70) (70) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111).
Also, two mold resin portions (71) (71) are formed at both corners of the other core portion parallel to the core portion of the core (11), and the mold resin portions (71) (71) Are pressed against the two corners of the outer case (17) to position the core component (1) in the outer case (17).

  As shown in FIG. 16, an inner peripheral wall (171) and a partition wall (172) are formed inside the outer case (17), and a core component storage chamber A is formed surrounding the inner peripheral wall (171). At the same time, a substrate housing chamber B partitioned from the core component housing chamber via a partition wall (172) is formed.

On the outer peripheral surface of the inner peripheral wall (171) of the outer case (17), one first convex portion (173) is formed facing the partition wall (172), and the inner peripheral wall (172) is formed on the partition wall (172). 171) and four second convex portions (174) to (174) are formed.
On the other hand, the mold resin bodies (70), (70) of the core component (1) have one first concave portion (72) in which the first convex portion (173) is closely fitted, and the four second convex portions. Four second recesses (73) to (73) into which the parts (174) to (174) are closely fitted are formed.

  The manufacturing process of the core component (1) includes a first step of winding a silicon steel plate to be the core (11) in a loop shape and a step of molding a synthetic resin to be the mold resin portions (7) (71) (71). 2 steps and a third step of cutting the molded synthetic resin together with the core to form a pair of molded resin bodies (70) and (70) and to form the magnetic gap portion (111).

In the assembly process of the current detector, the core component (1) and the circuit board (12) are accommodated in the outer case (17). As a result, the two mold resin portions (71), (71) of the core component (1) are pressed against the two corners of the outer case (17).
Further, the first convex portion (173) of the outer case (17) is closely fitted into the first concave portion (72) of the mold resin portion (7), and the second convex portions (174) to 174 of the outer case (17). (174) fits closely into the second recesses (73) to (73) of the mold resin portion (7).

  As a result, the core component (1) is held in the outer case (17), and a pair of mold resins is formed by close fitting of the outer case (17) and the pair of mold resin bodies (70) and (70). The bodies (70) and (70) are connected to each other via the outer case (17), and the gap length G of the magnetic gap part (111) is defined to a predetermined value.

  In the current detector, the core component (1) is partially covered by the mold resin portions (7), (71), (71) out of the total length along the magnetic path of the core (11). Therefore, the force that the core (11) receives from the surroundings when the mold resin portions (7), (71), and (71) are molded is relatively small, thereby suppressing an increase in the hysteresis of the core (11). .

Further, the outer case (17) exhibits a greater resistance to expansion and contraction of the magnetic gap portion (111) than the material of the mold resin portions (7), (71), and (71). ) Even if the core (11) is deformed in the expansion or contraction direction due to changes over time or environmental changes, the deformation is prevented by the resistance of the outer case (17), and the gap length of the magnetic gap part (111) is reduced. Fluctuations will be prevented.
Therefore, highly accurate current detection is realized.

  As shown in FIGS. 17 and 18, the current detector according to the seventh embodiment is a circuit board in which a core component (1) and a Hall element (10) are mounted inside a synthetic resin outer case (17). 12) and is housed.

The core component (1) includes a substantially quadrangular annular core (11) formed by, for example, winding a silicon steel plate, and the core (11) has a predetermined gap length on a core portion corresponding to one side of the quadrilateral. The magnetic gap part (111) which has is formed.
A Hall element (10) is interposed in the magnetic gap part (111).

The core portion of the core (11) is formed with a mold resin portion (8) that covers the outer peripheral surface of the core portion. The mold resin part (8) is composed of a pair of mold resin bodies (80) (80) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111).
Two mold resin portions (81) (81) are formed at both corners of the other core portion parallel to the core portion of the core (11), and the mold resin portions (81) (81) Are pressed against the two corners of the outer case (17) to position the core component (1) in the outer case (17).

  As shown in FIG. 19, an inner peripheral wall (171) and a partition wall (172) are formed inside the outer case (17), and a core component housing chamber is formed surrounding the inner peripheral wall (171). The core component storage chamber is formed with a substrate storage chamber partitioned by a partition wall (172).

As shown in FIGS. 19 and 20, two positioning pins (18) and (18) are provided between the inner peripheral wall (171) and the partition wall (172) on the inner surface of the outer case (17). ) Projecting in a direction parallel to the winding axis.
On the other hand, two positioning holes (82) and (82) into which the positioning pins (18) and (18) are closely fitted are formed in the mold resin bodies (80) and (80) of the core component (1). .

In the assembly process of the current detector, the core component (1) and the circuit board (12) are accommodated in the outer case (17). As a result, the two mold resin portions (81), (81) of the core component (1) are pressed against the two corners of the outer case (17).
Further, the two positioning pins 18 and 18 of the outer case 17 are closely fitted into the positioning holes 82 and 82 of the mold resin portion 8.

  As a result, the core component (1) is held in the outer case (17), and the outer case (17) and the pair of mold resin bodies (80) and (80) are closely fitted to each other, so that a pair of mold resins is obtained. The bodies (80), (80) are connected to each other via the outer case (17), and the gap length G of the magnetic gap part (111) is defined to a predetermined value.

In the current detector, the outer case (17) exhibits a greater resistance to expansion and contraction of the magnetic gap portion (111) than the material of the molded resin bodies (80) and (80). Even if the core (11) does not deform in the expansion or contraction direction due to changes over time in 11) or environmental changes, the deformation is prevented by the resistance of the outer case (17), and the gap length of the magnetic gap part (111) Fluctuations will be prevented.
Therefore, highly accurate current detection is realized.

  As shown in FIG. 21, the current detector according to the eighth embodiment is interposed between a core component (1) including a core (11) and a mold resin portion (9), and a magnetic gap portion (111) of the core (11). A hall element (10) and a synthetic resin mounting member (19) for holding the hall element (10) in the magnetic gap part (111) are provided.

  The mold resin part (9) of the core (11) is composed of a pair of mold resin bodies (90) (90) formed on both sides of the magnetic gap part (111) across the magnetic gap part (111). .

As shown in FIGS. 22 and 23, each of the pair of mold resin bodies (90) and (90) has a pair of positioning grooves (91) and (91) extending in parallel to each other in a direction perpendicular to the winding axis of the core (11). ) Is recessed. The mold resin body (90) shown in FIG. 23 shows a cross section taken along the line AA in FIG.
On the other hand, the mounting member (19) has four arm portions (191) to slidably engage with the four positioning grooves (91) to (91) of the mold resin portion (9) as shown in FIG. (191) is protruding.
A Hall element (10) is attached to the attachment member (19).

In the assembly process of the current detector, after the Hall element (10) is attached to the attachment member (19), the attachment member (19) is pressed toward the mold resin portion (9) of the core component (1), The arm portions (191) to (191) of the mounting member (19) are engaged with the positioning grooves (91) to (91) of the mold resin portion (9).
As a result, the pair of mold resin bodies (90) (90) are connected to each other by the attachment member (19).

In the above current detector, the mounting member (19) exhibits a greater resistance to expansion and contraction of the magnetic gap portion (111) than the material of the mold resin portion (2). Even if the core (11) does not deform in the enlargement direction or reduction direction due to changes over time or changes in the environment, the deformation is prevented by the resistance force of the mounting member (19), and the fluctuation of the gap length of the magnetic gap part (111) is prevented. Will be blocked.
Therefore, highly accurate current detection is realized.

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, in the above-described embodiment, the connection member made of the circuit board (12), the outer case (17), or the attachment member (19) prevents both the approach and separation of the pair of mold resin bodies. It is also possible to adopt a configuration that prevents deformation of one of the cores (11).

  According to the structure that prevents the pair of mold resin bodies from being separated by the connecting member, the core (11) formed of the wound core is prevented from being deformed in the expansion direction of the magnetic gap portion (111) due to the influence of the residual stress. I can do it.

  In addition, as the material of the connecting member, various materials (for example, thermosetting resins such as phenol) that exhibit greater resistance than the material of the mold resin portion (for example, PET) against expansion and / or contraction of the magnetic gap portion. , PC, PPS, SPS and other thermoplastic resins, ceramics and other insulating materials) can be employed.

  Further, various known magnetoelectric conversion elements can be employed in place of the Hall element (10). Furthermore, the pair of mold resin bodies is not limited to a configuration in which the pair of mold resin bodies are completely separated from each other.

(1) Core parts
(11) Core
(111) Magnetic gap
(2) to (9) Mold resin part
(20)-(90) Molded resin body
(10) Hall element
(12) Board
(17) Exterior case
(19) Mounting member

Claims (3)

In a current detector comprising an annular core having a magnetic gap portion and a magnetoelectric conversion element located in the magnetic gap portion of the core,
In the core, a mold resin portion that covers the surface of the core over a part of the entire length along the magnetic path is molded at one or a plurality of locations along the magnetic path so that an integral core component is formed. Configured,
Of the mold resin portions formed at one or a plurality of locations, one mold resin portion is formed of a pair of mold resin bodies that are formed across the magnetic gap portion of the core and located on both sides of the magnetic gap portion. The pair of mold resin bodies are coupled to each other via a coupling member that exhibits a greater resistance than the mold resin portion against expansion and / or contraction of the magnetic gap portion ,
The current detector according to claim 1, wherein the connecting member is an outer case that houses the core component . The current detector according to claim 1 , wherein the pair of mold resin bodies and the outer case are connected to each other by a concave-convex fitting structure. In a current detector comprising an annular core having a magnetic gap portion and a magnetoelectric conversion element located in the magnetic gap portion of the core,
In the core, a mold resin portion that covers the surface of the core over a part of the entire length along the magnetic path is molded at one or a plurality of locations along the magnetic path so that an integral core component is formed. Configured,
Of the mold resin portions formed at one or a plurality of locations, one mold resin portion is formed of a pair of mold resin bodies that are formed across the magnetic gap portion of the core and located on both sides of the magnetic gap portion. The pair of mold resin bodies are coupled to each other via a coupling member that exhibits a greater resistance than the mold resin portion against expansion and / or contraction of the magnetic gap portion,
The connecting member is an attachment member for holding the magnetoelectric conversion element in the magnetic gap portion, and each of the pair of mold resin bodies is provided with a positioning groove extending in a direction crossing the magnetic path of the core. The current detector is characterized in that an arm portion that slidably engages with each positioning groove of the pair of mold resin bodies protrudes from the mounting member .

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