TWI411787B - Current sensor - Google Patents

Abstract

This invention on one hand takes safety standards of electronic equipment into consideration, and on the other hand ensures creepage distance, easiness in assembly to realize miniaturization and small occupied area, and prevents sway of a magnetic core having deviation in dimension. First embedding parts (10a) capable of being embedded and having a creepage distance are arranged on an upper surface of a main body casing member (10). A first gap part (10d) is formed between an upper surface and a lower surface of the first embedding part (10a) in the length direction. A second embedding part (40a) capable of being embedded and having a creepage distance is arranged on a lower surface of a cover casing member (40). A second gap part (40d) is formed between a lower surface and an upper surface of the second embedding part (40a) in the length direction. A primary conductor (30) is mounted between the first embedding parts (10a, 10a) of the main body casing member (10) and is held down by the cover casing member (40). A magnetic core (50) with the cross section in shape of a transverse U is inserted into and secured to the first gap part (10d) and the second gap part (40d) in a manner of being clamped between the primary conductor (30) and a magnetic sensor (20).

Description

Current sensor

The present invention relates to a current sensor, and more particularly to a safety standard that can be considered for electrical equipment, while ensuring creepage distance, and can be easily assembled to achieve miniaturization or small footprint. A current sensor that prevents sway of the magnetic core having dimensional deviation.

In the current current sensor, in order to detect a general-purpose inverter or a motor control device for industrial use, or a current flowing through a current conductor to be measured wired in such a device, it is known that the following is included: The core of the shape and the magnetic sensor disposed in the gap portion of the core are integrally integrated with the core and the magnetic sensor by insulating resin, and the magnetic sensor is generated at the core. The magnetic flux change is detected as a current (for example, refer to Patent Document 1).

Further, it is also known that the core, the magnetic sensor, and the like are sandwiched and fixed by the crucible member and the cover member, and the core, the magnetic sensor, and the like are resin-molded to be integrated (for example, reference) Patent Document 2).

In recent years, in order to achieve miniaturization or thinning of current sensors, it is required to consider product safety standards for electrical equipment while focusing on product development in terms of space distance and creepage distance. In order to achieve electrical insulation without insulating the electrical components, it is necessary to ensure both the spatial distance and the Clearance and Creepage Distance. The clearance refers to the shortest distance through the space between two conductive portions, and the creepage distance refers to the shortest distance along the surface of the insulator between the two conductive portions. Since the distance required to achieve insulation is affected by factors including the necessary dielectric strength, operating voltage or estimated overvoltage, degree of contamination, tracking resistance of the insulator, etc., The development of current sensors must also be fully considered.

For example, in the case of the patent document 3, a current sensor which can ensure the distance between the primary circuit and the secondary circuit and has good assemblability even if the three-layer electric wire is not used is used in the cylinder formed in the bobbin. One of the pins of the core pin insertion portion is inserted into the core pin insertion portion, and the coil body of the coil is disposed on the outer circumference of the coil mounting portion on the outer side of the core pin insertion portion, and the coupling portion side of the core is located on the side of the bobbin The outer side, so that the distance between the coil and the core can be ensured by the bobbin.

Further, for example, the method described in Patent Document 4 relates to a current detecting mechanism and an assembling method thereof, which are not intended to ensure the creeping distance, and include a magnetic core which is disposed in two detachable currents to be detached The joint portion of the conductor includes at least one gap portion to surround the joint portion, and a magnetic sensor disposed in the gap portion, and can be assembled to achieve miniaturization or small footprint of the current detecting mechanism.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 09-257836

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2009-222729

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2005-90982

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2007-178241

However, in the above-described Patent Documents 1 and 2, the entire components of the current sensor are covered, or the components are housed to be packaged, and the package is resin-molded, so that it is used for integration. The work is complicated, and there is a problem that it cannot be simplified and miniaturized.

Further, although the above-described Patent Document 3 has been reduced in size by focusing on the creeping distance, there is still room for further improvement in terms of simplification of the number of components of the current sensor and simplification of assembly.

Further, although the above Patent Document 4 has a large meaning in terms of miniaturization and easy assembly with a minimum number of parts, the user cannot easily assemble the current detecting mechanism on the spot using a small number of components. As a product of the current sensor, it is not conducive to the development of products that focus on the distance of the surface while considering the safety standards for electrical equipment. Therefore, in order to realize the simplification and miniaturization of assembly as a current sensor unit, further improvement is required. Further, it is required to prevent the shaking of the magnetic core having dimensional deviation.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a current sensor that can ensure the creepage distance while considering a safety standard for electrical equipment, and can also operate in a high-pressure environment. It can be easily assembled to achieve miniaturization or small footprint, and to prevent sway of the magnetic core having dimensional deviation.

The present invention is achieved by achieving the above object. The invention of claim 1 is a current sensor comprising: a body member having an insertable upper surface having a creeping distance a joint portion is formed with a first gap portion between the upper surface and the lower surface in the longitudinal direction of the first fitting portion, and a magnetic sensor mounted on the upper surface side of the body member; the primary conductor a primary conductor connected to the current conductor to be measured and arranged in an orthogonal direction at a position opposite to the magnetic sensor; a cover member covering the magnetic sensor and the primary conductor, The surface has a second fitting portion having a creeping distance that can be fitted into the first fitting portion of the main body member, and a second surface is formed between the lower surface and the upper surface in the longitudinal direction of the second fitting portion. 2 voids; and section a magnetic core having a shape of the first and second gaps of the body member and the cover member inserted and inserted into the primary conductor; and the body member and the cover member The first and second fitting portions ensure the creeping distance and are disposed on the cross section of the magnetic core The magnetic sensor of the gap portion having a commensurate shape detects a change in magnetic flux generated in the magnetic core of the magnetic body as a current. (Examples 1, 2)

According to a second aspect of the invention, the first aspect of the invention, wherein the primary conductor is sandwiched between the main body member and the cover member, the body member has a plurality of the first members. In the fitting portion, the primary conductor is incorporated between the first fitting portions of the main body member. (Example 1)

According to a third aspect of the invention, the magnetic sensor is configured such that the main body member is closely adhered to the lid member, and the primary conductor is joined to the first fitting portion and the first fitting portion. The second fitting portion. (Example 2)

The invention according to any one of claims 1 to 2, wherein the first fitting portion and the second fitting portion have a convex or concave rectangle or Wavy shape.

The invention according to any one of claims 1 to 4, wherein the mounting body of the body member and the cover member of the cover member has a mounting groove.

The invention of any one of claims 1 to 5, wherein the body member is provided with a locking portion at a rear end position of the core of the body member and the cover member.

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

The invention of any one of claims 1 to 7, wherein the mounting portion of the magnetic sensor of the main body member is provided with a dividing portion of the wire of the magnetic sensor. .

The invention according to any one of claims 1 to 8, wherein the cover member is provided with a fitting claw, and the main body member is provided with a fitting and fixing for accommodating the fitting claw Pieces.

Further, the invention of claim 10 is the invention of any one of claims 1 to 9, wherein said cross section of said magnetic core The shape of the shape includes a U-shaped cross section or a C-shaped cross section having a narrow front end.

The invention of any one of the first to tenth aspects, wherein the magnetic sensor is a Hall IC.

Further, the invention of claim 12 is characterized in that the main body member includes a first fitting portion having a creeping distance that is engageable on the upper surface, and is in the longitudinal direction of the first fitting portion and on the upper surface a first gap portion is formed between the lower surfaces; a magnetic sensor is mounted on the upper surface side of the body 匣 member; and a primary conductor is connected to the current conductor to be measured and is located opposite the magnetic sensor. Arranging in the orthogonal direction; the cover member covering the magnetic sensor and the primary conductor, and having the second surface of the first fitting portion that can be fitted into the main body member on the lower surface a fitting portion having a second gap portion formed between the lower surface and the upper surface in a longitudinal direction of the second fitting portion; a magnetic core of a shape, which is inserted and fixed to the first and second gap portions of the main body member and the cover member so as to sandwich the primary conductor; and a side stopper provided on the body a wall surface of the weir member and the lid member, a direction perpendicular to an insertion direction of the lid member and the body core member with respect to the insertion direction of the magnetic core; and the first and second portions of the body jaw member and the lid member The fitting portion ensures the above-described creeping distance and is disposed by the above-described cross section with the above-described magnetic core The magnetic sensor of the gap portion having a commensurate shape detects a change in magnetic flux generated in the magnetic core of the magnetic body as a current. (Examples 3 and 4)

The invention of claim 12 is the invention of claim 12, wherein the side stopper is a convex member that is broken in contact with the magnetic core. (Example 3)

The invention of claim 14 is the invention of claim 13, wherein the convex member is a columnar member having a triangular cross section or a columnar member having a trapezoidal cross section.

Further, the invention of claim 15 is the invention of claim 12, wherein the side stopper has a tapered configuration. (Example 4)

Further, the invention of claim 16 is the invention of claim 15, wherein the tapered surface of the tapered structure has an insertion angle of 5 to 10 degrees.

According to a still further aspect of the invention, the first aspect of the invention, wherein the primary conductor is substantially tightly held by the body member and the cover member, the body member includes a plurality of the first embedded members In the joint portion, the primary conductor is incorporated between the first fitting portions of the main body member. (Example 1)

According to a still further aspect of the invention, the magnetic sensor according to claim 16 wherein the magnetic sensor is sandwiched between the main body member and the cover member, and the primary conductor is joined to the first fitting portion and the The second fitting portion. (Example 2)

The invention according to any one of claims 12 to 18, wherein any one of the first fitting portion and the second fitting portion has a rectangular or wavy shape having a convex or concave shape. The shape.

The invention of any one of claims 12 to 19, wherein the mounting body of the body member and the cover member of the cover member has a mounting groove.

The invention according to any one of claims 12 to 20, wherein the body member is provided with a locking portion at a rear end position of the magnetic core of the cover member.

The invention of claim 21 is the invention of claim 21, wherein the locking portion is a combination of a protrusion or a protrusion and a notch.

The invention according to any one of claims 12 to 22, wherein the mounting portion of the magnetic sensor of the main body member is provided with a dividing portion of the wire of the magnetic sensor .

The invention according to any one of claims 12 to 23, wherein the cover member is provided with a fitting claw, and the main body member is provided with a fitting and fixing for accommodating the fitting claw Pieces.

Further, the invention of claim 25 is the invention of any one of claims 12 to 24, wherein said cross section of said magnetic core The shape of the shape includes a U-shaped cross section or a C-shaped cross section having a narrow front end.

The invention of claim 26 is the invention of any one of claims 12 to 25, wherein the magnetic sensor is a Hall IC.

According to the present invention, a current sensor can be realized which can ensure the distance between the magnetic core and the magnetic sensor by completely covering the primary conductor with the resin raft, and can also operate under a high pressure environment, and can It is easy to assemble to achieve miniaturization or small footprint.

Moreover, since the magnetic sensor is completely covered by the resin crucible, the creeping distance from the primary conductor and the magnetic core to the terminals of the magnetic sensor is ensured, so that a large current with a large effective current can be realized. In this case, the operation can be performed, and the current sensor can be easily assembled to achieve miniaturization or small footprint.

Further, as a side stopper provided in a direction perpendicular to the insertion direction of the body jaw member and the lid member with respect to the insertion direction of the magnetic core, a side stopper integrally formed on the wall surface of the body jaw member is provided, and is integrally formed on the side stopper The side stopper of the wall surface of the lid member prevents the shaking of the magnetic core having dimensional deviation.

One of the gist of the present invention is to consider the safety standard for electrical equipment while ensuring the creeping distance. Since the creeping distance is greater than the spatial distance, only the creeping distance can be considered in the present invention. In addition, the part that becomes the high voltage is the primary conductor through which the current to be measured flows, and the part to be protected according to the safety standard is the signal of the control system and the power supply terminal, and the terminal portion of the magnetic sensor corresponds to this.

As a result of this research, compared with the conventional method of integrally molding a magnetic sensor, it has been found that a simple fitting method of using a resin crucible can be realized by applying a current sensor or a magnetic core. The high-precision current sensor with minimal stress suppression and less offset variation and temperature drift after assembly.

Further, in the case of fixing the respective members with the resin crucible, it is necessary to consider the shortest creeping distance along the fitting portion. However, in the present invention, in order to achieve miniaturization, the fitting portion is formed into a rectangular shape as described in the first and second embodiments. Or a wave shape to make the creeping distance longer, thereby realizing a small current sensor that can also operate in a high pressure environment.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

[Embodiment 1]

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 A-A of FIG. 1. In the first embodiment of the present invention, the primary conductor is completely covered by the resin crucible, and the distance between the magnetic core and the magnetic sensor is ensured. The gap between the magnetic core and the magnetic core is narrow, and the magnetic sensor and the magnetic sensor are The distance between the cores of the magnetic body is effective when it is difficult to handle.

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

The current sensor according to the first embodiment of the present invention can be easily assembled by the five components of the main body member 10, the magnetic sensor 20, the primary conductor 30, the cover member 40, and the magnetic core 50. This assembly is achieved without the use of a resin mold or an adhesive as in the prior art, but by fitting or joining.

The main body member 10 includes a first fitting portion 10a having a creeping distance on the upper surface thereof, 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 fitting portion 10a has a concavo-convex portion.

Further, the cover member 40 is provided with a second fitting portion 40a having a creeping distance on the lower surface thereof, and a second gap portion 40d is formed between the lower surface and the upper surface in the longitudinal direction of the second fitting portion 40a. The second fitting portion 40a has a concavo-convex portion.

Thereby, the uneven portion of the body jaw member 10 and the uneven portion of the lid member 40 are fitted to each other. Further, it is preferable that the uneven portion has a rectangular or wavy shape.

Further, a mounting groove 10b is provided at a mounting position of the magnetic sensor 20 of the main body member 10, and a mounting groove 40b is provided at a mounting position of the magnetic sensor 20 of the cover member 40, by the same. The slots 10b, 40b are mounted, and the magnetic sensor 20 is configured to be fixed by the body jaw member 10 and the lid member 40. Preferably, the magnetic sensor 20 is a Hall IC.

Further, the magnetic sensor 20 includes a magnetic detecting element and a signal processing circuit for processing a detection signal from the magnetic detecting element, the signal processing circuit having a non-volatile memory for reducing variations in detection characteristics of the magnetic detecting element or The adjustable function of the trimming resistor.

The primary conductor 30 is connected to the current conductor to be measured, and is fitted into the concave portion between the two first fitting portions 10a of the body member 10 so as to be disposed in the orthogonal direction at the opposite position of the magnetic sensor 20. That is, the main body member 10 includes a plurality of first fitting portions 10a and 10a, and the primary conductor 30 is assembled between the first fitting portions 10a and 10a of the body member 10, and is pressed by the lid member 40.

section The magnetic core core 50 of the shape is inserted and fixed to the first gap portion 10d of the main body member 10 and the second gap portion 40d of the lid member 40 so as to sandwich the primary conductor 30 and the magnetic sensor 20. Moreover, the profile of the magnetic core 50 The shape of the shape includes a U-shaped cross section or a C-shaped cross section having a narrow front end.

Further, at the rear end position of the magnetic core 50 of the main body member 10 and the cover member 40, locking portions 10c and 40c including protrusions are provided to fix the rear end portion of the magnetic core 50, that is, the cross section. The upper end of the opposite side of the gap portion of the word commensurate.

In this manner, the surface distance between the main body member 10 and the first and second fitting portions 10a and 40a of the lid member 40 can be ensured, and the magnetic sensor 20 disposed in the gap portion of the magnetic core 50 can be The magnetic flux change generated by the magnetic core 50 is detected as a current.

[Embodiment 2]

Fig. 3 is a perspective view for explaining a second embodiment of the current sensor of the present invention, and Fig. 4 is a cross-sectional view taken along line B-B of Fig. 3. In the second embodiment of the present invention, an example in which the magnetic sensor is completely covered by the resin crucible to ensure the creeping distance from the primary conductor and the magnetic core to the terminals of the magnetic sensor is effective in the following cases. That is, it is necessary to make the primary conductor thicker when measuring a large current having a large effective current, and therefore the distance between the magnetic core and the primary conductor is ensured to be difficult.

The difference from the above-described first embodiment is that in the second embodiment, the entire magnetic sensor is sandwiched by the main body member and the lid member in close contact with each other, and the body member and the body member are The fitting of the lid member is only one, and the primary conductor and the magnetic core are insulated via the gap.

In the figure, reference numeral 110 denotes a body 匣 member (resin 匣), 110a denotes a first fitting portion, 110b denotes a mounting groove of a magnetic sensor, 110c denotes a locking portion provided at a rear end position of the magnetic core, and 110d denotes 1 gap portion, 120 denotes a magnetic sensor, 120a denotes a wire of a magnetic sensor, 130 denotes a primary conductor connected to the current conductor to be measured, 140 denotes a cover member (resin 匣), 140a denotes a second fitting portion, Reference numeral 140b denotes a positioning groove of the magnetic sensor, 140c denotes a locking portion provided at a rear end position of the magnetic core, 140d denotes a second gap portion, and 150 denotes a magnetic core.

The current sensor according to the second embodiment of the present invention can be easily assembled by the five components of the main body member 110, the magnetic sensor 120, the primary conductor 130, the cover member 140, and the magnetic core 150. This assembly is achieved by merely fitting or joining the constituent elements without the use of the resin mold and the adhesive as in the prior art.

The main body member 110 has a first fitting portion 110a having a creeping distance on the upper surface thereof, 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 a concavo-convex portion.

Further, the lid member 140 is provided with a second fitting portion 140a having a creeping distance on the lower surface thereof, and a second gap portion is formed between the lower surface and the upper surface in the longitudinal direction of the second fitting portion 140a. In 140d, the second fitting portion 140a has a concavo-convex portion.

Thereby, the uneven portion of the body jaw member 110 and the uneven portion of the lid member 140 are fitted to each other. Further, the uneven portion may be a rectangular or wavy shape as in the first embodiment.

In the first embodiment, the first fitting portion 10a and the second fitting portion 40a are a double array, that is, a pair of fitting portions are provided between the magnetic sensor 20 and the primary conductor 30, and the primary conductor 30 is provided. Another set of fitting portions is provided between the magnetic cores. However, in the second embodiment, only one set of fitting portions is provided between the magnetic sensor 120 and the primary conductor 130 to make the primary conductor 130 and the gap The magnetic core 150 is insulated.

Further, a mounting groove 110b is provided at a mounting position of the magnetic sensor 120 of the body member 110, and a mounting groove 140b is provided at a mounting position of the magnetic sensor 120 of the cover member 140. The mounting grooves 110b and 140b are configured such that the magnetic sensor 120 is fixedly fixed to the cover member 140 by the main body member 110 and the cover member 140. Preferably, the magnetic sensor 120 is a Hall IC. Further, the configuration of the magnetic sensor 120 is the same as that of the first embodiment.

The primary conductor 130 is connected to the current conductor to be measured, and is placed in the first fitting portion 110a and the second fitting portion 140a so that the opposite positions of the magnetic sensor 120 are arranged in the orthogonal direction.

section The magnetic core 150 of the shape is inserted into the first gap portion 110d of the main body member 110 and the second gap portion 140d of the lid member 140 so as to sandwich the primary conductor 130 and the magnetic sensor 120. The shape of the magnetic core is the same as that of the first embodiment. Further, protruding locking portions 110c, 140c are provided at the rear end positions of the body core member 110 and the magnetic core 150 of the cover member 140 to fix the rear end portion of the magnetic core 150, that is, the section The upper end of the opposite side of the gap portion of the word commensurate.

In this manner, the creeping distance between the main body member 110 and the first and second fitting portions 110a and 140a of the lid member 140 can be ensured, and the magnetic sensor 120 disposed in the gap portion of the magnetic core 150 can be The magnetic flux change generated by the magnetic core 150 is detected as a current.

[Example 1]

Fig. 5 is a cross-sectional view showing the first embodiment in which the magnetic core of the first embodiment or the second embodiment of the present invention is engaged with the lid member and the body member. In the above-described first and second embodiments of the present invention, the engagement mechanism between the magnetic core and the lid member and the body member is the engagement mechanism of the first embodiment.

A locking portion 10c, 40c including a protrusion is provided at a rear end position of the body core member 50 and the magnetic core 50 of the cover member 40 to fix the rear end portion of the magnetic core 50, that is, a section The upper end portion of the opposite side of the gap portion 201 of the shape of the shape.

According to this configuration, since the main body member 10 and the rear end portion of the magnetic core 50 of the lid member 40 are provided with protrusions at at least one end portion, the magnetic core 50 is inserted into the crucible member, and then the magnetism is fixed without being attached. Body core. Further, the protrusion may be provided in the left-right direction other than the upper and lower end portions. This locking portion is suitable for a metal core such as a silicon steel which is easy to perform microfabrication and has high strength. Furthermore, the same applies to the second embodiment of the present invention shown in FIG. 3.

[Embodiment 2]

Fig. 6 is a cross-sectional view showing a second embodiment of the engagement mechanism between the magnetic core and the lid member and the body member in the first or second embodiment of the present invention.

A protrusion 50a is disposed at an end portion of the magnetic core 50 to fix the section The lower end portion on the opposite side of the gap portion 201 of the shape is provided, and the notch portion 40e for accommodating the projection 50a of the magnetic core 50 is provided at the rear end position of the body core member 10 and the magnetic core 50 of the lid member 40.

According to this configuration, since the stress applied to the magnetic core is only the last one, the damage to the magnetic core is small, and the insertion work becomes easy. The locking portion is suitable for a case where the magnetic core of the ferrite system is equal to a material which is brittle in strength and which is liable to cause cracks or nicks in the core due to an external force. Furthermore, the same applies to the second embodiment of the present invention shown in FIG. 3.

As described above, in the first and second embodiments of the above-described locking portion, by eliminating the subsequent steps, the thermal effect processing is not required, and as a result, the thermal stress on the magnetic sensor can be reduced, thereby achieving an improvement in reliability. And the shortening of the manufacturing steps is achieved.

[Example 3]

Fig. 7 is a plan view showing a third embodiment of the side block in which the magnetic core of the first embodiment and the second embodiment of the present invention and the lid member and the body member are inserted in the direction perpendicular to the direction in which the magnetic core is inserted. 8(a) to 8(c) are views for explaining the engagement function of the side stopper shown in Fig. 7, and Fig. 9 is a cross-sectional view taken along line CC of Fig. 7. Specifically, the modified form of FIG. 1 is shown, and the same components are denoted by the same reference numerals. Symbols 10e, 40f in the figure indicate side stops.

The side stopper of the third embodiment is a side stopper provided in a direction perpendicular to the insertion direction of the body 匣 member (resin 匣) 10 and the lid member (resin 匣) 40 with respect to the insertion direction of the magnetic core 50, by A side stopper 10e integrally formed on the wall surface of the body dam member 10 is provided, and a side stopper 40f integrally formed on the wall surface of the lid member 40 is provided to prevent sway of the magnetic core having dimensional deviation.

The shape of the side stopper 40f is a columnar member having a triangular cross section or a columnar member having a trapezoidal cross section as shown in the enlarged portion of Fig. 7, as long as the front end is broken by contact with the inserted magnetic core 50. The part a may be a convex member. Further, the shape of the side stopper 10e is also the same.

In FIGS. 7 and 9 , a total of four side stoppers 10 e are disposed on the left and right sides of the wall surface of the body jaw member 10 along the insertion direction of the body core member 10 and the lid member 40 of the magnetic core 50, and A total of four side stoppers 40f are provided on the left and right of the wall surface of the lid member 40. That is, a total of eight side stoppers 10e and 40f are provided on the wall surfaces of the body jaw member 10 and the lid member 40.

As shown in FIGS. 8(a) to 8(c), when the magnetic core 50 is inserted between the main body member 10 and the cover member 40, the wall surface of the main body member 10 and the cover member 40 is provided. The side stoppers 10e and 40f are in contact with each other, and if a force is further applied to the insertion, the front end portions a of the side stoppers 10e and 40f are broken. The magnetic core 50 is supported by the main body member 10 and the side stoppers 10e and 40f of the lid member 40 by the surface where the front end portion a is broken, so that the magnetic core 50 does not rattle.

That is, the side stoppers 10e and 40f are configured to have a thinner wall structure, so that the size of the inserted magnetic core 50 can be broken, and the side stoppers 10e and 40f can be broken with a weak force. Thereby eliminating sloshing. This is particularly effective when the magnetic core 50 is composed of a thin ferrite.

Further, in the rear end portion of the magnetic core 50, a projection 50a as an engagement mechanism is provided in the same manner as in Fig. 6 . That is, the protrusion 50a is provided to fix the section A lower end portion on the opposite side of the gap portion of the shape is provided, and a notch portion 40e for accommodating the projection 50a of the magnetic core 50 is provided at a position rearward of the body core member 10 and the magnetic core 50 of the lid member 40.

The other configuration is the same as that of Figs. 1 and 2 . Further, the side stoppers 10e and 40f shown in Figs. 7 to 9 can of course be applied to the second embodiment shown in Figs. 3 and 4 .

[Example 4]

Fig. 10 is a plan view showing a fourth embodiment in which the magnetic core of the first embodiment or the second embodiment of the present invention and the side member of the lid member and the body member are inserted in the direction perpendicular to the direction in which the magnetic core is inserted. 11(a) to 11(c) are views for explaining the engagement function of the side stopper shown in Fig. 10, and Fig. 12 is a sectional view taken along line DD of Fig. 10. Specifically, the modified form of FIG. 1 is shown, and the same components are denoted by the same reference numerals. Symbols 10f and 40g in the figure indicate side stoppers. The other configuration is the same as that of Figs. 7 and 9.

The side stopper of the fourth embodiment is a side stopper provided in a direction perpendicular to the insertion direction of the body 匣 member (resin 匣) 10 and the lid member (resin 匣) 40 with respect to the insertion direction of the magnetic core 50, by A side stopper 10f integrally formed on the wall surface of the body dam member 10 is provided, and a side stopper 40g integrally formed on the wall surface of the lid member 40 is provided to prevent sway of the magnetic core having dimensional deviation.

In FIGS. 10 and 12, a total of two side stoppers 10f are provided on the left and right sides of the wall surface of the body jaw member 10 along the insertion direction of the body core member 10 and the lid member 40 of the magnetic core 50, and A total of two side stoppers 40g are provided on the left and right of the wall surface of the lid member 40. That is, a total of four side stoppers 10f and 40g are provided on the wall surfaces of the body jaw member 10 and the lid member 40.

The shape of the side stopper 40g is as shown in the enlarged portion of Fig. 10, and has a tapered structure, and the insertion angle is preferably 5 to 10 degrees as long as it is in contact with the inserted magnetic core 50. The shape b can be slowly cut off. Furthermore, the shape of the side stopper 10f is also the same.

When the magnetic core 50 is inserted between the main body member 10 and the lid member 40, it comes into contact with the side stoppers 10f and 40g provided on the wall surfaces of the body jaw member 10 and the lid member 40, and further force is applied thereto. When it is inserted, the tapered surface b of the side stoppers 10e and 40f is gradually scraped off, and one side faces in the insertion direction. The magnetic core 50 is supported by the main body member 10 and the side stoppers 10f and 40g of the lid member 40 by the slowly peeled exposed surface, and is deflected even when the magnetic core 50 is inserted. The slant is also corrected by the tapered surface so that it is at the center position so that the magnetic core 50 does not sway.

In other words, since the side stoppers 10f and 40g have a tapered structure in which the width between the jaw members is gradually narrowed with respect to the insertion direction of the magnetic core 50, it is easy to apply without a force when inserted shallowly. Insertion, with the deeper insertion, the magnetic core 50 can be surely held with a large area while the side stoppers 10f and 40g are scraped off by the front end edge of the magnetic core 50. Moreover, as the magnetic core 50 is inserted, the magnetic core 50 is inevitably held at the left and right centers of the current sensor by the tapered faces b of the side stoppers 10f and 40g, so that the magnetic sensor is sensed. The part is located at the center of the magnetic core 50, and thus becomes the strongest current sensor against foreign magnetic field noise. Further, since the side stoppers 10f and 40g are not broken but are slowly scraped off, the resin chips scraped off are not scattered around, but are attached to the front end of the magnetic core 50 and housed in the resin crucible. No waste is generated in the front end slot. It is particularly effective when the magnetic core 50 is thick and difficult to crack. Further, in the case of the resistance at the time of insertion of the magnetic core 50 and the removal of the side stoppers 10f and 40g, the insertion angle of the tapered surface b is preferably 5 to 10 degrees.

Further, the side stoppers 10f and 40g shown in Figs. 10 to 12 can of course be applied to the second embodiment shown in Figs. 3 and 4 .

10, 110. . . Body 匣 component

10a, 110a. . . First fitting part

10b, 110b. . . Magnetic sensor mounting slot

10c, 110c. . . a locking portion disposed at a rear end position of the core

10d, 110d. . . First gap

10e, 10f, 40f, 40g. . . Side stop

20, 120. . . Magnetic sensor

20a, 120a. . . Magnetic sensor lead

30, 130. . . Primary conductor connected to the current conductor being measured

31. . . Embedded slot

40, 140. . . Cover member

40a, 140a. . . Second fitting part

40b, 140b. . . Magnetic sensor positioning slot

40c, 140c. . . a locking portion disposed at a rear end position of the core

40d, 140d. . . Second gap

40e, 140e. . . Notch

50, 150. . . core

50a, 150a. . . Protrusion

201. . . Gap

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view for explaining a first embodiment of a current sensor of the present invention.

Figure 2 is a cross-sectional view taken along line A-A of Figure 1.

Fig. 3 is a perspective view for explaining a second embodiment of the current sensor of the present invention.

Figure 4 is a cross-sectional view taken along line B-B of Figure 3.

Fig. 5 is a cross-sectional view showing a first embodiment in which the magnetic core of the first embodiment or the second embodiment of the present invention is engaged with the insertion direction of the magnetic core of the lid member and the body member.

Fig. 6 is a cross-sectional view showing a second embodiment of the engagement mechanism between the magnetic core of the first embodiment and the second embodiment of the present invention, and the magnetic core of the lid member and the body member.

Fig. 7 is a plan view showing a third embodiment of the side block in which the magnetic core of the first embodiment and the second embodiment of the present invention and the lid member and the body member are inserted in the direction perpendicular to the direction in which the magnetic core is inserted. .

8(a) to 8(c) are views for explaining the engagement function of the side stopper shown in Fig. 7.

Figure 9 is a cross-sectional view taken along line C-C of Figure 7.

Fig. 10 is a plan view showing a fourth embodiment in which the magnetic core of the first embodiment or the second embodiment of the present invention and the side member of the lid member and the body member are inserted in the direction perpendicular to the direction in which the magnetic core is inserted. .

11(a) to 11(c) are views for explaining the engagement function of the side stopper shown in Fig. 10.

Figure 12 is a cross-sectional view taken along line D-D of Figure 10.

10. . . Body 匣 component

10a. . . First fitting part

10b. . . Magnetic sensor mounting slot

10c. . . a locking portion disposed at a rear end position of the core

10d. . . First gap

20. . . Magnetic sensor

20a. . . Magnetic sensor lead

30. . . Primary conductor connected to the current conductor being measured

40. . . Cover member

40a. . . Second fitting part

40b. . . Magnetic sensor positioning slot

40c. . . a locking portion disposed at a rear end position of the core

40d. . . Second gap

50. . . core

Claims (26)

A current sensor comprising: a body member having a first fitting portion having a creeping distance on an upper surface thereof, and the upper surface and the lower surface in a longitudinal direction of the first fitting portion a first gap portion is formed therebetween; a magnetic sensor is mounted on the upper surface side of the body member; and a primary conductor is connected to the current conductor to be measured, and the opposite position of the magnetic sensor is positive Arranging in the direction of intersection; a cover member having a second surface having a creeping distance that is engageable with the first fitting portion of the body member on the lower surface so as to cover the magnetic sensor and the primary conductor a second gap portion is formed between the lower surface and the upper surface in a longitudinal direction of the second fitting portion; and a cross section a magnetic core having a shape of the first and second gaps of the body member and the cover member inserted and inserted into the primary conductor; and the body member and the cover member The first and second fitting portions ensure the creeping distance and are disposed on the cross section of the magnetic core The magnetic sensor of the gap portion having a commensurate shape detects a change in magnetic flux generated in the magnetic core of the magnetic body as a current. The current sensor according to claim 1, wherein the main body member has a plurality of the first fitting portions so that the primary conductor is closely held by the body member and the cover member, and The primary conductor is incorporated between the first fitting portions of the body member. The current sensor according to claim 1, wherein the magnetic sensor is sandwiched by the main body member and the cover member, and the primary conductor is joined to the first fitting portion and the second fitting portion. . In the current sensor of 2 or 3, any one of the first fitting portion and the second fitting portion has a rectangular or wavy shape having a convex or concave shape. A current sensor of 2 or 3, wherein the mounting position of the magnetic sensor and the magnetic sensor of the cover member has a mounting groove. A current sensor of 2 or 3, wherein a locking portion is provided at a position of the rear end of the body of the body member and the cover member. The current sensor of claim 6, wherein the locking portion is a protrusion or a combination of a protrusion and a notch. A current sensor of 2 or 3, wherein a portion of the magnetic sensor of the main body member is provided with a dividing portion of the wire of the magnetic sensor. A current sensor according to 2 or 3, wherein the cover member is provided with a fitting claw, and the body member is provided with a fitting fixing member for accommodating the fitting claw. a current sensor of 2 or 3, wherein the above-mentioned profile of the magnetic core The shape of the shape includes a U-shaped cross section or a C-shaped cross section having a narrow front end. A current sensor of 2 or 3, wherein the magnetic sensor is a Hall IC. A current sensor comprising: a body member having a first fitting portion having a creeping distance on an upper surface thereof, and the upper surface and the lower surface in a longitudinal direction of the first fitting portion a first gap portion is formed therebetween; a magnetic sensor is mounted on the upper surface side of the body member; and a primary conductor is connected to the current conductor to be measured, and the opposite position of the magnetic sensor is positive Arranging in the direction of intersection; a cover member having a second surface having a creeping distance that is engageable with the first fitting portion of the body member on the lower surface so as to cover the magnetic sensor and the primary conductor a second gap portion is formed between the lower surface and the upper surface in the longitudinal direction of the second fitting portion; a magnetic core of a shape, which is inserted and fixed to the first and second gap portions of the main body member and the cover member so as to sandwich the primary conductor; and a side stopper provided on the body a wall surface of the weir member and the lid member, a direction perpendicular to an insertion direction of the lid member and the body core member with respect to the insertion direction of the magnetic core; and the first and second portions of the body jaw member and the lid member The fitting portion ensures the above-described creeping distance and is disposed by the above-described cross section with the above-described magnetic core The magnetic sensor of the gap portion having a commensurate shape detects a change in magnetic flux generated in the magnetic core of the magnetic body as a current. A current sensor according to claim 12, wherein said side stopper is a convex member that is broken by contact with said magnetic core. The current sensor of claim 13, wherein the convex member is a columnar member having a triangular cross section or a columnar member having a trapezoidal cross section. A current sensor as claimed in claim 12, wherein said side stop has a tapered configuration. The current sensor of claim 15, wherein the tapered surface of the tapered structure has an insertion angle of 5 to 10 degrees. The current sensor according to any one of claims 12 to 16, wherein the main body member has a plurality of the first ones in such a manner that the primary conductor is closely held by the body member and the cover member. In the fitting portion, the primary conductor is incorporated between the first fitting portions of the main body member. The current sensor according to any one of claims 12 to 16, wherein the magnetic sensor is closely grounded by the body member and the cover member, and the primary conductor is joined to the first fitting portion and The second fitting portion. The current sensor according to any one of claims 12 to 16, wherein any one of the first fitting portion and the second fitting portion has a rectangular or wavy shape having a convex or concave shape. The current sensor of any one of claims 12 to 16, wherein the mounting position of the magnetic sensor and the magnetic sensor of the cover member has a mounting groove. The current sensor according to any one of claims 12 to 16, wherein a locking portion is provided at a rear end position of the body core member and the magnetic core of the cover member. The current sensor of claim 21, 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 12 to 16, wherein a portion of the magnetic sensor of the main body member is provided with a dividing portion of the wire of the magnetic sensor. The current sensor according to any one of claims 12 to 16, wherein the cover member is provided with a fitting claw, and the body member is provided with a fitting fixing member for accommodating the fitting claw. A current sensor according to any one of claims 12 to 16, wherein said cross section of said magnetic core The shape of the shape includes a U-shaped cross section or a C-shaped cross section having a narrow front end. The current sensor of any one of claims 12 to 16, wherein the magnetic sensor is a Hall IC.