Oval reel for producing wound capacitor unit core and wound capacitor unit core

Abstract

The invention discloses an oval reel for producing a wound capacitor unit core. The radial section of the oval reel is oval, and an opening in the surface of one end of an oval long shaft of the oval reel forms a guide groove which is used for mounting a leading-out stick and is in the same axial direction with the oval reel. The invention further discloses the wound capacitor unit core machined by the oval reel. The wound circle number of the core is relative to the length-to-width ratio of the oval reel. The wound capacitor unit core is machined by the oval reel, the width of the wound capacitor unit core can be reduced by changing the length-to-width ratio of the oval reel, the production requirement for the wound capacitor unit core with the extremely small width is met, medium damage due to the fact that the width of an inserted leading-out electrode is larger than the chord length of the insertion position can be reduced, and folds and torsion formed after a capacitor unit core wound by a round reel is flattened can also be eliminated.

Description

technical field [0001] The present invention relates to a reel for producing a wound capacitor unit core and the wound capacitor unit core, in particular to an elliptical reel for producing a wound capacitor unit core and the wound capacitor unit core. Background technique [0002] The core of the wound capacitor unit includes electrode foil / dielectric wound into a circle. The electrode foil / dielectric here refers to the electrode foil and the dielectric (that is, the insulating medium). The electrode foil / dielectric is wound through a reel. During processing, the electrode foil and The media are arranged alternately outside the reel. Before the winding process, the electrode foil and one end of the media will be temporarily fixed on the reel through the lead-out tab for easy winding. After the winding is completed, the lead-out tab and the winding core can be taken out. The traditional reel used to produce wound capacitor unit cores is a cylinder, that is, its radial sectio...

AI Technical Summary

Problems solved by technology

The traditional reel used to produce wound capacitor unit cores is a cylinder, that is, its radial section is circular, and its diameter has a certain limit for media with low tensile strength (such as capacitor paper and mica paper). Therefore, there is also a limit to the width of the wound capacitor unit core produced by the traditional circular reel. When it is necessary to design and produce a wound capacitor unit core smaller than the width limit, the traditional circular reel cannot achieve it.

If a reel with a rectangular section with rounded corners is used, it cannot be realized because the mechanical strength of the reel decreases with the reduction of its cross-sectional area.

In addition, the production of winding capacitor unit cores using traditional round reels also has the following disadvantages: the lead-out tab must be raised to remove the winding core smoothly after winding, and therefore the actual reel is equivalent to a cam instead of a cam. Standard cylinders not only have design deviations, but also easily lead to S-shaped twists after the winding core is flattened; when the diameter of the cylinder reel is small, the circular curvature of the core becomes larger. sheet, it is easy to cause damage to the medium (such as: mica paper). In order to reduce the damage to the medium, the width of the lead-out sheet has to be reduced, but reducing the width of the lead-out sheet will lead to an increase in the core inductance and capacitor. The current-carrying capacity is reduced, and when using asymmetrically positioned lead-out pieces for radial lead-out, it is difficult to find the exact position on the circular reel

[0003] Therefore, the traditional circular reel cannot meet the production requirements of wound capacitor unit cores smaller than its own width limit, especially the production requirements of wound capacitor unit cores with low dielectric strength and toughness. For example, it cannot meet the production requirements of wound capacitor unit cores made of mica paper As the production demand of winding capacitor unit core as a medium, it is necessary to seek new technical solutions to solve the above problems

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