JPH05335182A - High-voltage film capacitor - Google Patents

Abstract

PURPOSE:To stably keep the end face of a high voltage film capacitor rolled body high in dielectric breakdown strength. CONSTITUTION:Metallized electrodes 2 and metal foil electrodes 2a and 2b are arranged on a dielectric film 12 along a lengthwise direction, and the film 12 and another dielectric film where metallized electrodes are formed are made to overlap each other making the electrodes of them partially confront each other and then rolled tap for the formation of a high-voltage film capacitor, where a dielectric film piece 4 is placed on the electrode 2a located at a rolling start and made to protrude from the side edge of the film 12. The projection of the film piece 4 is melted to be filled into a gap between the dielectric film piece 4 and the dielectric film 12 produced due to the interposition of the electrode 2a after the dielectric films are rolled up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage film capacitor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 14 and 15, for example, a high voltage film capacitor has a dielectric film b ₁ having a plurality of electrodes a arranged in parallel at a predetermined interval.
And a plurality of electrodes a arranged side by side at a predetermined interval, of which a winding start end electrode a ₁ and a winding end end electrode a ₂
And a dielectric film b ₂ to which the lead wire c is connected, are superposed with the dielectric film d interposed therebetween and the polymer of the dielectric films b ₁ , b ₂ and d is wound from one end thereof, and thereafter, It is made by immersing the wound body in a resin liquid and impregnating it with a resin.

[0003]

In the high voltage film capacitor described above, when a withstand voltage test is performed by applying a voltage between the pair of lead wires c, the adhesion of the impregnating resin that adheres to both end faces of the capacitor winding body is confirmed. Since the amount is not stable, there is a disadvantage that the dielectric strength of the end face portion varies.

It is an object of the present invention to provide a high voltage film capacitor which eliminates the above-mentioned conventional inconveniences.

[0005]

A series of a plurality of electrodes and a series of a plurality of electrodes which are arranged at predetermined intervals along a length direction of the dielectric film via a dielectric film. In order to achieve the above-mentioned object, in the high voltage film capacitor formed by stacking and winding so that a part of each electrode faces each other, the invention according to claim 1 provides a dielectric film piece with a lead wire. Is placed on or under at least one of the electrodes at the winding start end and the winding end end connected to each other, and is arranged so as to project from the side edge of the dielectric film, and the projecting portion of the dielectric film piece is melted and It is characterized in that a melted dielectric is filled in a gap between the dielectric film and the dielectric film piece formed by interposing an electrode. According to a second aspect of the present invention, the dielectric film pieces are stacked on top and bottom of at least one of the winding start end and winding end end electrodes to which lead wires are connected, and the dielectric film pieces are arranged so as to project from the side edges of the dielectric film. It is characterized in that the protruding portion of the dielectric film piece is melted to fill the gap between the pair of dielectric film pieces with the melted dielectric material.

[0006]

In the above-described high voltage film capacitor of the present invention, the dielectric film piece is superposed on or under at least one of the winding start end and winding end end electrodes to which the lead wire is connected, and the dielectric film is formed. Of the electrode, or by stacking the dielectric film pieces on the upper and lower sides of at least one of the electrodes and projecting them from the side edges of the dielectric film, and melting the protruding portion of the dielectric film piece. Since the melted dielectric is filled in the gap between the dielectric film and the dielectric film piece formed by the interposition or between the pair of dielectric film pieces, the lead wire at the winding start end does not depend on the amount of impregnated resin. The dielectric strength of the end surface of the wound body between the lead wire at the end of winding and the lead wire at the end of winding is stably maintained.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show an embodiment of the present invention. 1 and 2, reference numeral ₁₁ denotes a dielectric film in which a plurality of, for example, three metallized electrodes 2 are arranged at predetermined intervals along the length direction, and ₁₂ denotes, for example, two metallized electrodes 2. It is a dielectric film which is arranged at a predetermined interval along the length direction, and further has metal foil electrodes 2a and 2b arranged at a predetermined interval from the metallized electrode 2 at a winding start end and a winding end end. The metallized electrode 2 and the metal foil electrodes 2a and 2b are narrower than the dielectric films 1 ₁ and 1 ₂ , and the lead wires 3a and 3b are spot-welded and connected to the metal foil electrodes 2a and 2b. is derived on the film 1 _1, 1 ₂ in the width direction, on the metal foil electrodes 2a, the metal foil electrodes 2a, a large dielectric film pieces 4 than the width and length of 2b is from one side edge of the dielectric film 1 ₂ It is projected and placed. The dielectric film 1 ₁ and 1 two between the _second dielectric film 1 _3, further two on top of the dielectric film 1 _first dielectric film 1 _3, also of the dielectric film 1 ₂ is one of the dielectric film 1 ₃ superposed respectively on the lower, the polymer is wound from the left end of FIG.
FIG. 3 shows the wound body 5, and the dielectric film piece 4 projects from the end surface of the wound body 5. This dielectric film piece 4
Between the dielectric film 1 ₂ under the metal foil electrode 2a and the metal foil electrode 2a, as shown in FIG.
Thus, the protruding portion 7 of the dielectric film piece 4 is heated and melted, and the gap 6 is filled with the melted dielectric 8 as shown in FIG. FIG. 6 shows the wound body 5a after this work.
The wound body 5a is impregnated with resin. In the above embodiment, although placing the dielectric film pieces 4 on the metal foil electrodes 2a, as shown in FIG. 7, during a manner shown in FIG. 2, a metal foil electrode 2a and the dielectric film 1 ₂ You may insert and arrange the dielectric film piece 4 in.

8 to 13 show another embodiment of the present invention. In this embodiment, the lead wires 3a and 3b are spot-welded and led out in opposite directions from the side edges of the dielectric film 1 ₂ respectively to the metal foil electrode 2a at the winding start end and the electrode 2b at the winding end end. Dielectric film pieces 4a and 4b, which are larger than the width and length of the metal foil electrodes 2a and 2b, are arranged above and below to project from the opposite side edges of the dielectric film 1 ₂ . The dielectric film 1 ₂ on which the electrodes 2a and 2b are arranged is superposed on the dielectric films 1 ₁ and 1 _{3 in the same} manner as in the above embodiment, and the polymer is wound from the left end of FIGS. 8 and 9. . As shown in FIG. 10, the wound body 5 has one end of each of the dielectric film pieces 4a and 4b protruding from both end surfaces thereof. Since a gap 6a is formed between the dielectric films 4a and 4b as shown in FIG. 11 due to the interposition of the metal foil electrodes 2a and 2b, the dielectric film piece 4
The protrusions 7 of a and 4b are heated and melted, and the gap 6a is filled with the melted dielectric 8a as shown in FIG. FIG. 13 shows the wound body 5a after this work.
Impregnate a with resin.

[0009] In the embodiment shown in FIGS. 1 to 6, the dielectric film 1 _1, 1 ₂ and using a polyester film having a thickness of 6μ as 1 _3, the dielectric film pieces 4 and the dielectric film 1 ₂ and the metal foil dimensions l _1, l ₂ shown in Fig. 2 between the between the electrode 2a and the dielectric film 1 ₂ and the metal foils 2a,
If l ₃ is l ₁ = 3 mm, l ₂ = 2 mm, l ₃ = 4 mm, then 30
For the present invention product having a KV rating and the conventional product which is the same as the present invention product except that the dielectric film piece is not used, the lead wire 3
The following table shows the breakdown voltage test results when a DC voltage was applied for 30 seconds with a (+) polarity to a and a (-) polarity to lead wire 3b.

[0010] For the embodiment shown in FIGS. 8 to 13 having dimensions similar to the dimensions l ₁ , l ₂ and l _{3 of the} embodiment shown in FIGS.
As a result of a withstand voltage test conducted under the same conditions as those of the above-described examples, none of the 30 specimens produced insulation breakage.

In the embodiments shown in FIGS. 1 to 6 and 7, the metal foil electrode 2a at the winding start end of the dielectric film piece 4 is wound.
However, the film piece 4 may be arranged above or below the metal foil electrode 2b at the end of winding. Further, in the embodiment shown in FIGS. 8 to 13, either one of the metal foil electrodes 2a and 2b, the dielectric film pieces 4a and 4b may be omitted.

[0012]

As described above, the present invention arranges a dielectric film piece on or under, or on and under, at least one of the winding start end and the winding end end of the metal foil electrode and dielectrically disposes it. It was made to protrude from the side edge of the body film, and this protruding portion was melted and melted in the gap between the dielectric film and the dielectric film piece formed by the interposition of the metal foil electrode or the gap between the pair of dielectric film pieces. Since it is filled with the dielectric, it has an effect that the dielectric strength of the end surface of the wound body is stably maintained.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention in a state before winding a dielectric film and separating the dielectric films from each other.

FIG. 2 is a plan view of one dielectric film of the above embodiment.

FIG. 3 is a front view of the wound body of the above embodiment.

FIG. 4 is a sectional view of a part of the wound body shown in FIG.

FIG. 5 is a view of melting the protruding portion of the dielectric film piece.
Sectional view of part of the wound body shown in

6 is a front view of the wound body of FIG.

FIG. 7 is a side view of a main part of a modified example of the above embodiment.

FIG. 8 is a side view of a dielectric film according to another embodiment.

9 is a plan view of the dielectric film shown in FIG.

FIG. 10 is a front view of a wound body according to another embodiment.

11 is a partial cross-sectional view of the wound body shown in FIG.

FIG. 12 is a view showing that the protruding portion of the dielectric film piece is melted.
Sectional drawing of a part of the wound body shown in 0

13 is a front view of the wound body shown in FIG.

FIG. 14 is a side view showing the conventional high voltage film capacitor in the same manner as in FIG. 1 with the dielectric film separated.

FIG. 15 is a plan view of one dielectric film of the capacitor shown in FIG.

[Explanation of symbols]

l ₁ , l ₂ , l ₃ dielectric film 2
Metallized electrodes 2a, 2b Metal foil electrodes 3a, 3b Lead wires 4, 4a, 4b Dielectric film pieces 5, 5a
Winding body 6, 6a Gap 7 Projection part 8, 8a Dielectric

Claims (2)

[Claims] 1. A series of a plurality of electrodes and a series of a plurality of other electrodes, which are arranged at predetermined intervals along the length direction of the dielectric film, through a dielectric film. In a high voltage film capacitor formed by overlapping and winding so that parts of
It is placed on or under at least one of the electrodes at the winding start end and the winding end end to which the lead wire is connected, and is arranged so as to project from the side edge of the dielectric film, and the projecting portion of the dielectric film piece is melted. A film capacitor for high voltage, wherein a gap between the dielectric film and the dielectric film piece formed by interposing the electrode is filled with a melted dielectric. 2. A series of a plurality of electrodes and a series of a plurality of other electrodes which are arranged at predetermined intervals along the length direction of the dielectric film via a dielectric film, In a high voltage film capacitor formed by overlapping and winding so that parts of
At least one of the electrodes at the winding start end and the winding end end, to which the lead wire is connected, is superposed on and under the electrode and is arranged so as to project from the side edge of the dielectric film, and the projecting portion of the dielectric film piece is melted to form a pair. A film capacitor for high voltage, characterized in that a gap between the dielectric film pieces is filled with a melted dielectric material.