JP2001167948A - Coil for large current, choke coil, and line filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly safe multistage filter by eliminating connecting sections from a current supply line. SOLUTION: Four or more winding sections 2a-2d, each of which is formed by cylindrically winding a flat wire 2 in a state where the wire 2 is laminated in the thickness direction, are formed integrally and continuously via connecting sections 3, and at the same time, lead-out lead sections 4 are formed on both end sides of the wire 2 and fitting holes 6 for screws are formed in the lead sections 4. In addition, outside connecting terminals are constituted on the front end sides of the lead sections 4. The front end sides of the lead section 4a are twisted by 90 deg. and formed into broad sections 5, which are molded broader than the width of the element wire of the wire 2. At constituting of a multistage filter, a magnetic core is commonly combined with a plurality of winding sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a large current coil, a choke coil and a line filter used in electronic equipment and the like, and more particularly to a multi-stage structure.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a multi-stage choke coil or line filter for a large current, a coil is individually formed by winding around a toroidal type magnetic core or a magnetic core such as a UU or UI type. It has been common to connect external connection terminals by a method such as caulking or soldering.

[0003] Japanese Unexamined Patent Publication No. 7-1 has disclosed a conventional choke coil or line filter for a large current.
As disclosed in Japanese Patent No. 30546, there is a type using a so-called eyeglass-shaped coil winding that employs a coil winding in which a rectangular electric wire is wound by an automatic device. However, JP-A-7-130
No. 546 adopts a configuration in which a coil winding and an external connection terminal are connected by a connection conductor obtained by bending a conductive plate.
Japanese Patent Application Laid-Open No. Hei 7-130560 has a structure in which coil ends are led out as faston terminals.

In the structures disclosed in JP-A-7-130546 and JP-A-7-130560, only two winding portions are provided. Therefore, when the number of stages of a choke coil for a large current or a line filter is increased, After all, connection and wiring work between the coils is required.

[0005]

As described above, in the case of a large current choke coil or a line filter having a multi-stage structure by connecting and wiring a plurality of coils, if the connection is incomplete, the connection is not sufficient. There is a possibility that serious accidents may occur, such as heat generated by the system, a fire caused by sparks, or a system stoppage caused by disconnection of the main power supply circuit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-current coil, a choke coil, and a line filter which have no connection portion in a current supply line and have high safety.

[0007] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0008]

In order to achieve the above object, a coil for high current according to claim 1 of the present invention comprises four or more windings each formed by laminating rectangular electric wires in a thickness direction and winding them in a cylindrical shape. The wire is formed integrally and continuously via a connecting portion, and lead wires are formed at both ends of the rectangular electric wire.

Thus, a multi-stage large-current coil having no connection portion in the current supply line can be realized, and safety and reliability can be improved.

[0010] According to a second aspect of the present invention, there is provided the coil for a large current according to the first aspect, wherein a screw hole is formed in the lead-out lead portion, and an external connection terminal is formed at a tip end side of the lead-out lead portion. .

Thus, the end of the flat wire can be shared with the external connection terminal, and the external connection cable can be screwed.

According to a third aspect of the present invention, there is provided a high current coil according to the first or second aspect, wherein the leading end of the lead-out portion has a surface twisted by 90 degrees.

[0013] Thereby, it is possible to attach the external connection cable from above and below, and to improve workability at the time of construction.
Prevent construction failure.

According to a fourth aspect of the present invention, there is provided the coil for a large current according to any of the first to third aspects, wherein the leading end of the lead-out portion is a wide portion formed to be wider than the width of the wire of the rectangular electric wire. It is characterized by:

The wide part can be formed by compressing the end of the flat wire by a method such as pressing to make the width wider than the wire, and adjusting the compressibility by pressing even if the width of the wire of the flat wire is small. Then, by molding to an appropriate width, mounting bolts suitable for the current and the external connection cable can be used.

A choke coil according to a fifth aspect of the present invention is a high-current coil in which four or more winding portions formed by laminating rectangular electric wires in the thickness direction and winding in a cylindrical shape are continuously formed integrally via a connecting portion. And a magnetic path in which a magnetic core is combined. The magnetic path is provided in common to one or more adjacent winding parts, and each winding part is wound so that the magnetic flux of each winding part reinforces each other. It is characterized by being.

Thus, a multi-stage choke coil having no connection portion in the current supply line can be realized, and safety and reliability can be improved.

According to a sixth aspect of the present invention, there is provided a line filter comprising four or more winding portions formed by laminating rectangular electric wires in a thickness direction and winding in a cylindrical shape, and integrally and continuously formed through a connecting portion. Are arranged in parallel, and a magnetic path is formed by combining a magnetic core in common with the winding portions of the plurality of large current coils.

Thus, a multistage line filter having no connection portion in the current supply line can be realized, and safety and reliability can be improved.

According to a seventh aspect of the present invention, there is provided the line filter according to the sixth aspect, wherein a lead wire of a filter element or a circuit is fixed to the connecting portion with a screw.

As a result, it is possible to connect a filter element or a circuit without performing soldering.

The line filter according to claim 8 of the present invention is the liner according to claim 6 or 7, wherein the high-current coil is mounted on a metal member, and a heat-radiating insulating member is provided between the high-current coil and the metal member. Is interposed.

Accordingly, even when the resin casting of the coil is omitted, the heat radiation effect of the coil can be improved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a large current coil, a choke coil and a line filter according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention, in which a continuous multi-stage coil 1 is formed by a rectangular electric wire as a coil for a large current. As shown in these figures, the flat wire 2 is laminated in the thickness direction and wound in a cylindrical shape to form a first-stage winding portion 2a, and the same flat wire 2 is connected through the connecting portion 3 in a direction opposite to 2a. The second-stage winding portion 2b is formed so as to rewind. Similarly, the third-stage and fourth-stage winding portions 2c and 2d are continuously formed via the connecting portion 3 to form a continuous multi-stage winding coil 1.

The pair of winding portions 2a and 2b are connected to each other when the legs of a split type closed magnetic circuit core such as a UI type core or a UU type core are inserted in common on their inner peripheral sides when current is supplied. The windings 2a and 2b are arranged on the same surface so that the magnetic fluxes generated by the cylindrical windings 2a and 2b reinforce each other and flow through the closed magnetic path. The remaining two pairs of windings 2c,
The same applies to 2d.

Further, both ends of the flat electric wire 2 of the continuous multi-stage coil 1 are connected to the winding portions 2a. The lead leads 4 are located on the same side in the axial direction 2d (indicated by the arrow P in FIG. 1) and are led out in a straight line in opposite directions. However, the tip side of the lead wire 4 is twisted (twisted) by 90 degrees in the axial direction of the rectangular electric wire, and is about 25% (minimum) of the width of the wire (the original rectangular electric wire before processing). However, the width is 5% or more.) The wide portion 5 is formed by press working or the like so as to be wide. The upper and lower surfaces of the wide portion 5 are twisted by 90 degrees with respect to the portions constituting the winding portions 2 a to 2 d and the connecting portion 3 of the flat wire 2.

Further, the wide portion 5 is machined with screw holes 6 for external connection cable mounting bolts as screw holes, and the end of the flat wire 2 (the end of the lead-out portion) itself is used as an external connection terminal. ing. When a nut is used together, the mounting hole 6 may be a simple through-hole.

The wide portion 5 is molded so that mounting bolts suitable for the current and the external connection cable can be used. If the widened portion 5 is less than 5% wide, the effect is small. As described above, it is assumed that the width is at least 5% or more with respect to the strand, and the upper limit is about 30%. If the width exceeds 30%, the thickness of the wide portion becomes too thin and the strength is reduced.

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

(1) The four winding portions 2a, 2b, 2c, 2d formed by laminating the rectangular electric wires 2 in the thickness direction and winding them into a cylindrical shape are continuously formed integrally via the connecting portion 3, and Since the lead-out leads 4 are formed at both ends of the rectangular electric wire 2, a multi-stage large current coil having no connection portion in the current supply line inside the coil can be realized. As a result, safety and reliability can be improved.

(2) Since the mounting hole 6 as a screw hole is formed in the lead-out lead portion 4 so that an external connection terminal is formed at the tip end of the lead-out lead portion 4, the external connection cable can be attached to the external connection cable. It can be directly connected to and fixed to the lead-out lead part 4 by using a bolt.

(3) Since the leading end of the lead-out lead portion 4 has a 90-degree twisted surface, it is possible to attach an external connection cable from above and below, thereby improving workability during construction and preventing construction failure. Can be.

(4) The leading end of the extraction lead portion 4 is a wide portion 5 which is formed to be 5% to 30% wider than the width of the wire of the rectangular electric wire 2 so that the width of the wire of the rectangular electric wire is small. Even if the compression ratio is adjusted by a press or the like and molded into an appropriate width, a mounting bolt having a diameter suitable for a current or an external connection cable can be used.

FIGS. 3 and 4 show a second embodiment of the present invention, in which three three-phase two-stage common mode choke coils are used by using three large current coils shown in the first embodiment. 1
0 is shown. A divided closed magnetic circuit core commonly shared by the three large current coils, that is, the first stage winding portion 2a and the second stage winding portion 2b of the continuous multi-stage winding coils 1-1, 1-2, and 1-3. The UU-shaped core 20 is provided with a closed magnetic circuit, and
The UU-shaped core 2 is commonly used for the fourth and fourth winding portions 2c and 2d.
One closed magnetic circuit is provided. That is, the UU-shaped core 20 and the coil are insulated from each other by the insulating cylinder 11 and the coil holders 12 fitted to both ends thereof, and the UU-shaped core 20 is inserted inside the winding portions 2a and 2b. Then, the UU-shaped core 20 is butted and integrated with a core holding metal fitting (U bolt) 15 (a nut 14 is screwed to an end of the core holding metal fitting 15 and tightened). Reference numeral 16 denotes an insulating partition plate for securing insulation between the phases. Similarly, the UU-shaped core 21 is inserted inside the winding portions 2c and 2d to butt and integrate. In the continuous multi-stage winding coils 1-1 and 1-3, the lead lead portion 4 is bent to the side to widen the interval between the wide portions 5 with respect to 1-2. Regarding the continuous multi-stage coil, the same or corresponding parts as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this case, each continuous multi-stage coil is wound in the same closed magnetic path in such a direction that the magnetic fluxes of the winding portions reinforce each other. Three such coils with the same number of turns
A three-phase two-stage common mode choke coil 10 is realized by assembling the components.

According to the second embodiment, it is possible to realize a multi-stage structure having no connection portion in the current supply line inside the common mode choke coil. As a result, safety,
Reliability can be improved. Other functions and effects are the same as those of the first embodiment.

FIG. 5 shows a third embodiment of the present invention, in which the three-phase two-stage common mode choke coil shown in the second embodiment is combined with a filter circuit (or a filter element). The case where the line filter 30 is configured is shown. Insulating resin terminal blocks 31, 32 are provided on both sides of a metal shield case 40, which is a metal member.
2, 1-3 lead-out lead portions 4 are respectively led out. An external connection cable mounting bolt 33 for mounting an external connection cable is provided for each of the lead-out portions 4 on these terminal blocks 31 and 32. When nuts are provided in advance on the side of the terminal blocks 31 and 32 below each lead-out part, a through-hole through which a bolt is inserted is formed as a mounting hole for the lead-out part 4. In the case of a structure in which no nut is provided on the side of the terminal blocks 31 and 32, a female screw hole to be screwed with the bolt 33 is formed as a mounting hole for the lead 4.

Similarly to the second embodiment, the continuous multi-stage wound coils 1-1, 1-2, and 1-3 are provided with closed magnetic paths of UU-shaped cores 20, 21 as split-type closed magnetic path cores, respectively. The three-phase two-stage common mode choke coil 10 is configured. Reference numerals 41, 42, and 43 denote filter circuits (or filter elements) including at least capacitors and the like, which are connected to the ends and intermediate portions of the respective continuous multi-stage winding coils 1-1, 1-2, and 1-3. This connection can be made by soldering, bolting or the like of the lead wire of the filter circuit. Note that, for the common mode choke coil 10, the same reference numerals are given to the same or corresponding parts as in the second embodiment, and description thereof will be omitted.

Although not shown in FIG. 5, the metal shield case 40 has a box-shaped structure and a cover, and surrounds the entire periphery of the common mode choke coil and the filter circuit.

According to the third embodiment, the three-phase two-stage common mode choke coil 10 and the filter circuit 4
By combining 1, 42 and 43, a three-phase line filter 30 can be configured. Again, in this case,
It is possible to realize a multi-stage structure having no connection portion in the current supply line inside the line filter, thereby improving safety and reliability. Other functions and effects are the same as those of the first embodiment.

FIGS. 6 to 8 show a fourth embodiment of the present invention, which shows a line filter. In this case, a small hole is formed in the connecting portion 3 between the continuous multi-stage winding coils 1-1, 1-2, and 1-3, and the end of the lead wire 42a of the filter circuit (or the filter element) 42 is , Nut 49
It is fixed with.

The insulating resin terminal blocks 31, 32 on both sides of the metallic shield case 40, which is a metallic member, are connected to the lead 4 of the continuous multi-stage coil 1-1, 1-2, 1-3.
8 and three ribs 51 shown in FIG.
2 and an upper surface groove 53 sandwiched between them. A female female screw member 54 having a concave groove 55 formed therein is fixed to each upper groove 53 by a small screw 56 shown in FIG. 7 so that the extraction lead 4 is led out at substantially the same height. The lead-out lead portion 4 is pulled out while being superposed on the plate 60 (the upper surface of the female screw member 54 and the upper surface of the lead-out lead portion 4 are substantially flush with each other). The conductive plate 60 provided on the lead-out portion 4 is provided with a filter circuit (or a filter element) 41 other than a coil.
43 for connecting filter circuits (or filter elements) 41 and 43 inside the case of the conductive plate 60.
The ends of the lead wires 41a and 43a are connected by soldering or the like.

As shown in FIG. 8, the washers 57 and 58 are fitted through the small holes of the lead-out lead 4 and the small holes of the conductive plate 60 which extend on the metal female screw members 54 on the upper surface grooves 53 of the insulating terminal blocks 31 and 32. An external connection cable attachment bolt 33 as a screw member is screwed into a female screw member 54 as a nut, and tightened to form an external connection wire 7.
0 can be electrically connected and fixed firmly.

Further, as shown in FIG. 7, a heat-resistant material such as silicon rubber is provided between the lower portion of the continuous multi-stage coils 1-1, 1-2 and 1-3 and the bottom of the metal shield case 40. The heat radiation insulating member 70 is interposed. In other words, the heat insulating member 70 is composed of the continuous multi-stage wound coils 1-1, 1-2, 1
-3 are fixedly arranged so as to come into contact with the lower arc-shaped portion of each winding portion and also to come into contact with the bottom portion of the case 40.

Reference numeral 65 denotes a ground terminal provided outside the case 40, and 66 denotes a terminal cover.
6 is mounted so as to cover the upper surfaces of the terminal blocks 31 and 32 as necessary. Reference numeral 67 denotes an upper lid that closes an upper surface opening of the metal shield case 40.

The other components of the fourth embodiment are the same as those of the above-described third embodiment, and the same or corresponding parts have the same reference characters allotted, and description thereof will not be repeated.

According to the fourth embodiment, the filter circuit (or filter element) 42 can be screwed at an intermediate position between the continuous multi-stage coils 1-1, 1-2, and 1-3, and the soldering operation can be performed. It can be omitted, and the connection of the filter circuit or element to the intermediate position can be easily and reliably performed. Further, the filter circuits (or filter elements) 41 and 43 can be easily connected by using the conductive plate 60 overlapping the lead-out lead portion 4. The other operation and effect are the same as those of the third embodiment.

FIGS. 9 and 10 show a fifth embodiment of the present invention, which shows a line filter with a reduced installation area.
In this case, the filter circuits (or filter elements) 41, 42, and 43 including capacitors and the like are placed above the three-phase two-stage common mode choke coil 10 via a fixture 80 in a metal shield case 40 that is a metal member. Mounted and supported. Other configurations are the same as those of the above-described fourth embodiment.

In the fifth embodiment, each filter circuit (or filter element) 41, 4
2, 43 are three-phase two-stage common mode choke coils 10
The installation area can be reduced by bringing it to a position above the. Other functions and effects are the same as those of the above-described fourth embodiment.

Although the UU type core is exemplified as the split type closed magnetic path core, a UI type core may be used, and a magnetic path is formed by combining magnetic cores so as to have a gap in a part of the closed magnetic path depending on the application. May be. Also, the large current coil may have four or more winding portions.

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.

[0053]

As described above, according to the present invention,
Since there is no connection portion in the current supply line, a large current coil, a choke coil, and a line filter with high safety and reliability can be realized. In addition, the large current coil has four or more winding portions, so that a multi-stage choke coil or line filter can be easily configured.

[Brief description of the drawings]

FIG. 1 is a plan view showing a continuous multi-stage coil as a large current coil according to a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an exploded view showing a three-phase two-stage common mode choke coil according to a second embodiment of the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a plan view of a line filter according to a third embodiment of the present invention, in which a cover portion of a case is omitted.

FIG. 6 is a plan view of a line filter according to a fourth embodiment of the present invention, in which a lid portion of a case is omitted.

FIG. 7 is a front sectional view of the same.

FIG. 8 is a side view of the same.

FIG. 9 is a plan view of a line filter according to a fifth embodiment of the present invention, in which a cover portion of a case is omitted.

FIG. 10 is a front sectional view of the same.

[Explanation of symbols]

 1, 1-1, 1-2, 1-3 Continuous multi-stage coil 2a First-stage winding unit 2b Second-stage winding unit 2c Third-stage winding unit 2d Fourth-stage winding unit 3 Connecting unit 4 Pull-out Lead part 5 Wide part 6 Mounting hole 10 Common mode choke coil 11 Insulation tube 12 Coil holder 13 Core bracket 14 Nut 15 Core holding bracket 16 Insulating partition plate 20, 21 UU-shaped core 30 Line filter 31, 32 Terminal block 40 Case 41, 42, 43 filter circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H01F 37/00 H01F 37/00 T 27/29 27/28 L 27/28 H03H 7/09 A H03H 7 / 09 H01F 15/10 H (72) Inventor Makoto Ono 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation F-term (reference) 5E043 AA02 AA09 AB04 BA01 BA03 EA01 EA02 EA06 EB02 5E070 AA01 AA20 AB10 BA08 CA02 CA14 CA15 CA16 DA04 DA05 DA18 DA20 DB04 DB08 EA06 EA08 5J024 AA01 BA18 DA26 DA32 EA09 FA04

Claims (8)

[Claims] At least four winding portions formed by laminating rectangular electric wires in a thickness direction and winding in a cylindrical shape are continuously formed integrally via a connecting portion, and lead wires are provided at both ends of the rectangular electric wire. A coil for a large current, characterized by forming a portion. 2. A screw hole is formed in the lead-out part,
2. The coil for a large current according to claim 1, wherein an external connection terminal is formed on a tip end side of the lead-out portion. 3. The coil for a large current according to claim 1, wherein the leading end of the lead lead portion has a surface twisted by 90 degrees. 4. The coil for a large current according to claim 1, wherein the leading end of the lead-out portion is a wide portion formed to be wider than the width of the wire of the rectangular electric wire. 5. A high-current coil in which four or more winding portions formed by laminating rectangular electric wires in the thickness direction and wound in a cylindrical shape are continuously formed integrally via a connecting portion, and a magnetic core are combined. And a magnetic path, wherein the magnetic path is provided in common to one or more sets of adjacent winding parts, and each winding part is wound so that the magnetic flux of each winding part reinforces each other. Choke coil. 6. A plurality of large current coils formed by laminating rectangular electric wires in the thickness direction and winding them into a cylindrical shape and continuously forming four or more winding portions integrally via a connecting portion in parallel. A line filter, wherein a magnetic path is formed by combining a magnetic core in common with the winding portions of the plurality of large current coils. 7. The line filter according to claim 6, wherein a lead wire of a filter element or a circuit is fixed to the connecting portion with a screw. 8. The line filter according to claim 6, wherein the high-current coil is mounted on a metal member, and a heat-radiating insulating member is interposed between the high-current coil and the metal member. .