JP2001167947A - Noise filter for large current - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacturing and assembling of a noise filter for large current, so that stable uniform products is supplied by making the front end sides of the lead-out lead sections of spectacles-type coil windings usable as outside connecting terminal sections by forming the front end sides by twisting the sections by 90 deg.. SOLUTION: This noise filter has a choke coil, which is formed by attaching a coil winding 50 in which two winding sections 61 and 62, each of which is formed by cylindrically winding a flat wire in the same direction in a state, where the wire is laminated in the thickness direction, are formed through a connecting section to a split type closed magnetic circuit core 70. Magnetic fluxes which are generated from the two winding sections 61 and 62 of the winding 50 and circularly flow through the core 70 flow in the direction, in which the magnetic fluxes strengthen each other and the lead-out lead sections of the winding sections 61 and 62 are positioned on the same side of the sections 61 and 62 in the axial direction. In addition, the front end side sections of the lead sections respectively constitute outside connecting terminal sections 64a and 65a having 90 deg. twisted surfaces and the sections 64a and 65a are led out to an insulating terminal block 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-current noise filter using a choke coil wound with a rectangular electric wire, and more particularly to an insulated terminal block in which a leading end of a lead of a coil winding is used as an external connection terminal. And a large current noise filter derived in the above.

[0002]

2. Description of the Related Art Conventional large current box type noise filters are
A common mode choke coil in which two or three thick electric wires are wound around a toroidal core by hand or the like, and a box-shaped metal whose upper surface is open, external connection terminals are penetrated on the opposing side walls, and the inside is covered with insulating paper The case is housed in a case together with another filter element such as a capacitor and connected to a filter circuit, and an embedding resin is injected and cured in the case to fix a coil in the case, and a lid is attached to the case.

[0003] The connection between the coil and the external connection terminal is performed by crimping a connection fitting to an end of the coil of the coil, or a terminal portion capable of soldering the end of the winding to the external connection terminal in advance. The external connection terminals are screwed or soldered and fixed to the external connection terminals.

In these methods, it is necessary to attach a connection fitting to the end of the winding, or to solder the end of the winding to an external connection terminal, and the position and orientation of the end of the winding vary. The disadvantage is that the assembly time is long.

In recent years, in order to eliminate these drawbacks, a so-called glasses-type coil winding employing a coil winding in which a rectangular electric wire is wound by an automatic device as disclosed in Japanese Patent Application Laid-Open No. Hei 7-130546. And a configuration in which the coil winding and the external connection terminal are connected by a connection conductor obtained by bending a conductor plate in a box-shaped metal case. Each coil winding which automatically wound a rectangular electric wire in a cylindrical shape,
The position and the direction of the end are the same, and the through hole provided in the end enables the connection by screwing. The connecting conductor is
Both ends are opposed to the ends of the windings and the external connection terminals in the metal case to facilitate connection by screwing.

That is, as shown in FIGS. 7 and 8, the surface of the end portion 3 of the eyeglass-shaped coil winding 2 used is the same as the wide surface 5 of the rectangular electric wire 4. The three-phase choke coil 1 shown in FIG. 1 is composed of three rectangular wire-wound coil wound coils 2 and four insulating partition plates 6 each having two holes.
The insulating cylinders 7 are inserted through two communication holes, that is, the center holes of the divided cylindrical winding portions 11 and 12 of the glasses coil winding 2 and the holes of the insulating partition plate 6. Then, the legs of the two U-shaped cores 8 are inserted and butted from both sides of the insulating cylinder 7, and in this case, the end 3 provided with the small hole 9 of each of the eyeglass-shaped coil windings 2 is The insulating partition plate 6
It is formed concentrically side by side with each other.

An insulating base 16 fixed to the inner bottom of the box-shaped metal case 15 is provided with a connecting conductor 18 for connecting the end portion 3 to an external connection terminal 17.
Are formed by bending both ends of an L-shaped conductive plate laid down at right angles to provide a small hole 19 near one end and a U-shaped notch 20 at the other end.
Is formed. External connection terminal (bolt)
The insulating terminal plate 22 provided with 17 is fitted in the square notch 23 of the metal case 15.

[0008] The choke coil 1 is mounted on an insulating base 16 fixed to the inner bottom of a box-shaped metal case 15.
When the spectacle-shaped coil winding 2 is placed on the insulating base 16 to which the connecting conductors 18 are fixed in advance outside the box-shaped metal case 15 and fixed to the insulating base 16 with the core holding member 21, the spectacle-shaped coil winding 2 are connected to the small holes 19 of the connecting conductor 18.
And is connected to the connecting conductor 18 through screws through the small holes 9 and 19, and is further assembled by fitting the insulating terminal plate 22 into the square notch 23. The U-shaped notch 20 of the connection conductor 18 is fixed with a nut screwed to the external connection terminal 17.

[0009]

In the conventional constructions shown in FIGS. 7 and 8, the surface of the end portion 3 of the eyeglass-shaped coil winding 2 is the same as the wide surface 5 of the rectangular electric wire 4. When a plurality of eyeglass-shaped coil windings 2 are arranged in parallel, the space between the end portions 3 becomes narrow, so the screwing work efficiency is poor, the tightening cannot be performed, which causes a connection failure, and the structure becomes complicated and the economy becomes complicated. It has a drawback that there is a problem in terms of nature.

SUMMARY OF THE INVENTION In view of the above, the present invention makes it possible to use this portion as an external connection terminal portion by forming the leading end side of the leading lead portion of the eyeglass coil winding by twisting it by 90 degrees. It is an object of the present invention to provide a large-current noise filter that can be assembled extremely easily, can supply a stable and uniform product, and is a low-cost product.

Other objects and novel features of the present invention will be clarified in embodiments described later.

[0012]

In order to achieve the above-mentioned object, the present invention relates to a method of connecting two winding portions in the same winding direction, which are formed by laminating rectangular electric wires in a thickness direction and winding the same in a cylindrical shape. A large current noise filter having a choke coil in which one or a plurality of (for example, one to four phases) coil windings formed through a portion are mounted on a split type closed magnetic circuit core. The magnetic flux circulating around the split-type closed magnetic circuit core by the two winding portions is in a direction to reinforce each other, and the extraction lead portions of the two winding portions are on the same side in the axial direction of each winding portion,
In addition, the leading end portion of the lead-out portion constitutes an external connection terminal portion having a surface twisted by 90 degrees, and the external connection terminal portion is drawn out to an insulating terminal block.

In the large current noise filter, it is preferable that insulating means for insulating the coil windings from each other is provided.

[0014] A conductor plate is provided on the insulating terminal block, a part of the conductor plate overlaps the external connection terminal portion and is electrically connected, and a circuit element is connected to an inner portion of the conductor plate. It may be configured.

[0015] The split type closed magnetic circuit core may be constituted by either a UI type core or a UU type core.

It is preferable that the external connection terminal is formed to be thinner and wider than the thickness of the rectangular electric wire.

A female screw member may be arranged on the insulating terminal block, and a screw member inserted into a small hole of the external connection terminal portion may be screwed with the female screw member.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a high-current noise filter according to the present invention.

FIG. 1 is an embodiment of the present invention, and is a plan view of a large current LC filter as a large current noise filter with a case lid removed, FIG. 2 is a front sectional view of the same, and FIG. It is sectional drawing which shows the structure of a terminal block.

In these figures, the large current LC filter is housed in a box-shaped metal case 30, an insulating terminal block 40 attached to both longitudinal end surfaces of the box-shaped metal case 30, and the box-shaped metal case 30. Three coil-shaped coil windings 50, and other filter circuits or filter elements (capacitors, resistors, etc.) 91, 92.

The box-shaped metal case 30 comprises a case body 31 having a bottom surface and four side surfaces, and a case cover 36 for closing the upper opening. The case body 31 has cutouts 32 at both ends of the opening for fitting the insulating terminal block 40,
Further, it has a boxed bottomed structure in which a mounting surface 33 having mounting holes 34 provided on the outside at both ends on the bottom side is formed. Case lid 3
Reference numeral 6 denotes a structure that can be fitted into the case body 31 and screwed. A grounding connection piece 35 is attached to the inside of the case main body 31 below the mounting position of one of the insulating terminal blocks 40, and the insulating terminal block 4 is attached to the outside of the case main body 31.
A ground terminal 95 is attached beside the 0.

As shown in FIGS. 4 to 6, the glasses-shaped coil winding 50 is formed by stacking rectangular electric wires 51 having a rectangular cross section in the thickness direction and connecting them via a connecting portion 53 so as to have the same winding direction in a cylindrical shape. And has two cylindrical winding portions 61 and 62 wound continuously. When the legs of a split-type closed magnetic circuit core 70 such as a UI type core or a UU type core are inserted in common on the inner peripheral side of the two winding portions 61 and 62, a cylindrical winding is formed when current is supplied. The winding portions 61 and 62 are arranged on the same surface so that the magnetic fluxes formed by the portions 61 and 62 reinforce each other and flow through the closed magnetic circuit, thereby forming a glasses-shaped winding structure.

The connecting portion 53 includes two winding portions 61 and 62.
Linear portion 53 drawn in the common tangential direction of the outer peripheral surface of
a and a linear portion 5 drawn in a tangential direction (for example, a direction perpendicular to the common tangent line) of the outer peripheral surface of one of the winding portions 62.
3b and a curved portion 53c connecting the linear portions 53a and 53b.

The lead-out portions 64 and 65 (64 is the winding portion 61 side and 65 is the winding portion 62 side) of the glasses-shaped coil winding 50 are arranged in the axial direction of each of the winding portions 61 and 62 (FIG. 6). (Indicated by an arrow P in FIG. 3) and extending outward in opposite directions to each other, with the distal end 90 ° away from the base.
It has external connection terminal portions 64a and 65a which are flat surfaces twisted by degrees. Therefore, the flat surface 68 of the external connection terminal portions 64a and 65a has two cylindrical winding portions 61, as shown in FIG.
62 is parallel to the contact surface Q common to the outer peripheral surface. These external connection terminal portions 64a and 65a
Is formed to be thinner and wider than the thickness. A small hole 66 is formed in a plane 68 of each of the external connection terminal portions 64a and 65a.
Are formed. For this reason, a screw member (bolt) is inserted into the small hole 66, and an external connection line can be electrically connected and fixed firmly with a nut.

The rectangular electric wire 51 used in this embodiment has a plate width of about 7 mm and a plate thickness of about 2.5 mm, the outer diameters of the cylindrical winding portions 61 and 62 are 40 mm, the inner diameter is 33 mm, and when viewed from the front. The height is 17 mm, the center distance between the two tubular windings is about 44 mm, and the lengths of the lead leads 64 and 65 that extend to the side from the two tubular windings when viewed from the front are about 66 mm. .

The insulated terminal block 40 allows the external connection terminal portions 64a and 65a of the three eyeglass coil windings 50 to pass therethrough.
Upper surface groove 43 sandwiched between the slit holes 41 and the ribs 42
And Each upper groove 43 has a groove 4 so that the external connection terminal portions 64a and 65a are led out at substantially the same height.
The metal female screw member 44 and the conductor plate 80 on which the wire 5 is formed are overlapped and fixed by the small screw 46, and the external connection terminal portions 64a and 65a are drawn out into the concave groove 45 thereof. The terminal portions 64a and 65a are arranged at substantially the same height as the upper surface). The conductor plate 80 provided on the external connection terminal portions 64a and 65a is for connecting filter circuits (or filter elements) 91 and 92 other than the coil winding.

The assembling of each part into the box-shaped metal case 30 can be performed, for example, in the following procedure.

First, the three spectacle-shaped coil windings 50 are arranged in parallel so that the winding directions are the same, and a spectacle-shaped insulating partition plate 90 and a coil winding 50 for insulating the coil windings 50 from each other. And the cylindrical winding portions 61 and 6 of the coil winding 50 via a bobbin 95 that insulates the core 70 from the split type closed magnetic circuit core 70.
The legs of the UI or UU-shaped split-type closed magnetic circuit core 70 are inserted into the inner periphery of U, U bolts 75 serving as fasteners, a holding plate 76 into which both ends are inserted, and a male screw at the tip of the U bolt 75. A split type closed magnetic path core 70 such as a UI or UU type is butted with a nut 77 screwed to the portion to hold the closed magnetic path state.

Then, the conductor plate 80 is superimposed on the external connection terminal portions 64a and 65a of each of the eyeglass coil windings 50 and inserted into the slit holes 41 of the insulating terminal block 40, respectively. After the insulating terminal blocks 40 are inserted into both ends of the three glasses coil windings 50, the insulating terminal blocks 40 are mounted in the cutouts 32 of the box-shaped metal case 30.

The filter circuits (or elements) 91, 9
2 is a conductor plate 8 overlapping the external connection terminal portions 64a and 65a.
No. 0 is connected to the inside of the case and the ground connection piece 35 by soldering or the like.

As shown in FIG. 3, the washers 47 and 48 are passed through the small holes 66 of the external connection terminal portions 64a and 65a and the small holes of the conductor plate 80 extending above the metal female screw member 44 on the upper surface groove 43 of the insulating terminal block 40. The fitted screw member 49 is screwed into the female screw member 44 as a nut. Thereby, the external connection line 100 can be electrically connected and fixed firmly.

After assembling the eyeglass-shaped coil winding 50 into the box-shaped metal case 30, the case cover 36 is fitted into the box-shaped metal case 30 as shown in FIG.

A terminal cover 93 is mounted so as to cover the upper surface of the terminal block 40 as required.

According to this embodiment, the following effects can be obtained.

(1) As shown in FIGS. 4 to 6, a plane in which the external connection terminal portions 64a and 65a of the eyeglass-shaped coil winding 50 are twisted by 90 degrees with respect to the base portions at the distal ends of the extraction lead portions 64 and 65. 68, and the flat surface 68 has two cylindrical winding portions 61,
62 is parallel to the contact surface of the outer peripheral surface, and is pulled out at a position slightly lower than the eyeglass-shaped coil winding 50 in the box-shaped case 30, so that the height of the large current LC filter is reduced. It can be lowered, so it can be mounted lower to the external mounting surface than before, it can be easily mounted in a narrow mounting space, and the structure can be simplified because there is no need for a separate external connection terminal member It is.

(2) The screw member 49 is screwed to the female screw member 44 as a nut, so that an external connection line can be connected without soldering. In this case, the allowable current is limited by the size of the screw member 49. Therefore, if a screw member 49 that is large enough to meet the needs is required, the external connection terminal portions 64a,
By reducing the thickness of the portion of the flat surface 68 of the portion 65a and increasing the surface width, the diameter of the small hole 66 can be increased.

(3) The conductor plate 80 is superimposed on the external connection terminal portions 64a and 65a of the eyeglass-shaped coil winding 50, and is electrically connected by tightening with the screw member 49.
A circuit element such as a capacitor can be easily connected to the inner end portion of the substrate by soldering or the like.

(4) The connection work between the flat surface 66 of the external connection terminal portions 64a and 65a and the conductor plate 80 by the screw member 49 and the connection work of the external connection lines can be performed from directly above, so that the assembly work is extremely easy.

(5) UI or U as a split type closed magnetic circuit core
By using the U-shaped core, it is easy to mount the glasses core-shaped coil winding 50, and it is also easy to fix the divided cores in abutting state.

(6) The female screw member 44 as a nut is fixed to the insulating terminal block 40 on the box-shaped case side, and the concave groove 45 is formed here.
External connection terminal portions 64 at both ends of the eyeglass-shaped coil winding 50
a, 65a are pulled out, and the external connection terminal portions 64a,
By screwing the screw member 49 into the female screw member 44 by inserting the screw member 49 into the small hole 66 of the hole 65a, a terminal block having a screw fixing structure can be easily configured, and the external connection line can be screw-connected.

In the above embodiment, three glasses coil windings are arranged in parallel in a box-shaped metal case in order to correspond to a three-phase AC line or the like. Alternatively, a structure in which two glasses-shaped coil windings are housed in a box-shaped metal case may be used. 1 phase ~ depending on the application
Four-phase coil windings may be provided on the split-type closed magnetic circuit core.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be.

[0043]

As described above, according to the high current noise filter according to the present invention, two windings in the same winding direction are formed by stacking flat electric wires in the thickness direction and winding them in a cylindrical shape. The part is formed via a connecting part, and one or more glasses-shaped coil windings are used, and the lead-out lead portion of each glasses-shaped coil winding is arranged on the same side in the axial direction of each winding part. Since the leading end side of the lead-out lead portion is pulled out to the insulating terminal block as an external connection terminal portion having a surface twisted by 90 degrees, there is no need to use a separate external connection terminal member.
This has the effect of making the structure very simple.

Further, even if a plurality of eyeglass-shaped coil windings are used, the height is low and the external connection work can be made extremely simple, and the external connection terminal portion is thinner and wider than the thickness of the rectangular electric wire. By doing so, the current limitation by the bolts and nuts can be widened, and by forming a small hole in the external connection terminal portion, it is not necessary to have a faston terminal structure (since fixing by bolts and nuts can be used). This has the effect of simplifying the overall structure and making it economically inexpensive.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a high-current noise filter according to the present invention, with a case lid removed.

FIG. 2 is a front sectional view of the same.

FIG. 3 is a side sectional view showing a configuration of an insulated terminal block in the embodiment.

FIG. 4 is a front view of a spectacle-shaped coil winding used in the embodiment.

FIG. 5 is a rear view of the same.

FIG. 6 is a plan view showing a cross section of a part of the eyeglass coil winding.

FIG. 7 is a perspective view of a conventional glasses coil winding.

FIG. 8 is an exploded perspective view showing an example of a conventional large current noise filter using a spectacle-shaped coil winding.

[Description of Signs] 1 Choke coil 2, 50 Glass-shaped coil winding 4, 51 Flat wire 6 Insulating partition plate 7 Insulating cylinder 8 U-shaped core 9 Small hole 15, 30 Box-shaped metal case 31 Case body 33 Mounting surface 34 Mounting Hole 35 Grounding connection piece 36 Case lid 40 Insulated terminal block 41 Slit hole 42 Rib 43 Upper surface groove 44 Metal female screw member 45 Depressed groove 49 Screw member 53 Connecting portion 53a Linear portion 53b Linear portion 53c Curved portion 61, 62 Cylindrical winding part 64, 65 Leader lead part 64a, 65a External connection terminal part 66 Small hole 68 Flat surface 70 Split type closed magnetic circuit core 77 Nut 80 Conductor plate 90 Glass-shaped insulating partition plate 91, 92 Filter circuit (or element)

Claims (6)

[Claims] 1. A split type closed magnetic circuit core comprising a coil winding in which two rectangular windings in the same winding direction formed by laminating rectangular electric wires in a thickness direction and winding the same in a cylindrical shape via a connecting portion. In the high current noise filter having one or more choke coils mounted on the core, the magnetic flux circulating through the split type closed magnetic circuit core by the two winding portions of the coil windings is in a mutually resilient direction. The lead-out leads of the two windings are on the same side in the axial direction of each of the windings, and the leading end of the lead-out constitutes an external connection terminal having a surface twisted by 90 degrees, A noise filter for a large current, wherein the external connection terminal portion is drawn out to an insulating terminal block. 2. The large current noise filter according to claim 1, further comprising an insulating means for insulating the coil windings from each other. 3. A conductor plate is provided on the insulating terminal block, a part of the conductor plate overlaps the external connection terminal portion and is electrically connected, and a circuit element is connected to an inner portion of the conductor plate. The high current noise filter according to claim 1 or 2, wherein 4. The split type closed magnetic circuit core is a UI type or UU
4. The mold core according to claim 1, 2, or 3.
Noise filter for large current as described. 5. The external connection terminal portion is formed to be thinner and wider than a thickness of the rectangular electric wire.
The high current noise filter according to 3 or 4. 6. A female screw member is disposed on the insulating terminal block, and a screw member inserted into a small hole of the external connection terminal portion is screwed to the female screw member. 6. The noise filter for a large current according to 4 or 5.