Manufacturing method of radial iron core column of transformer

Abstract

A method for manufacturing a radial-type iron core column of a transformer, comprising the steps of cutting and arranging materials, stacking sheets in sequence, positioning sheets, closing molds to form a circle, shrinking and forming a circle, binding, and dipping and curing processes. The present invention aims at the practical problem that the existing technology cannot make large-scale radiating core columns, and utilizes two formwork frames that are hinged at one end, semicircular in radial direction, and placed horizontally, and stack all the sheet materials into two mold frames in sequence. Two semicircular sheet material circles are formed in a mold frame, and then the production of an iron core column is completed after the processes of mold closing into a circle and shrinking into a circle. The iron core column made has many advantages such as high lamination coefficient and effective magnetic cross-section, good parallelism between the arrangement of silicon steel sheets and the longitudinal magnetic force line, and small eddy current loss. The magnetic power equipment produced by it is subjected to electromagnetic force in the alternating magnetic field There will be no phenomenon of electromagnetic noise due to vibration between chips.

Description

【Technical field】 [0001] The invention belongs to a method for manufacturing a magnetically conductive core, in particular to a method for manufacturing a radiation-type iron core column of a transformer. 【Background technique】 [0002] Among the three known transformer cores, the radial laminated core is opposite to the parallel laminated or involute laminated core. Due to its edge effect process, the direction of magnetic derivation is different from that of the silicon steel laminations. The directions are parallel, so it has the advantages of low eddy current loss, no local overheating and remarkable energy saving effect. Before the present invention was made, because there was no ideal molding device, it was impossible to produce radially conductive core column products for transformers, and only radial iron core cakes for power reactors came out. [0003] figure 1 The cross-sectional structure of a radially conductive core cake is schematically drawn. The core cake i...

AI Technical Summary

Problems solved by technology

The method: 1. Since the sheet material is a silicon steel paint sheet, its thickness is usually only about 0.3mm, and the thin steel property of the sheet is poor. When the sheet material exceeds a certain height (usually 500mm), it cannot be stacked vertically. Therefore, it is only suitable for Make iron core cakes of a certain height, but cannot make columnar radial-shaped magnetic core columns for transformers

2. When laminating, because there is no radial external force preload, the sheets are loose, and only rely on resin fillers to fill and solidify the molding, so the lamination coefficient required by the design cannot be achieved, and the effective magnetic permeability cross-section ratio is low.

3. Since the expansion coefficients of the silicon steel sheet and the resin filler are inconsistent, when the temperature rises, the resin filler will crack, which seriously affects the reliable operation of the equipment

4. From figure 1 It can be seen that after forming, firstly, only the widest sheet b is arranged radially with the center hole a as the center, and other silicon steel sheets have an off-angle relative to the center hole a, that is, figure 2 There is a deflection angle in the amplitude magnetic force line d, so there is a defect that the magnetic force line passes through the silicon steel sheet and the eddy current loss is large

The second is that its outer circumference cannot form a perfect circle, the sheets are uneven, and the sheets are loose. Therefore, the equipment made of it is affected by the fundamental wave of the alternating current during the application of the alternating magnetic field, and the sheets are prone to vibration and emit electromagnetic waves. noise

From the above points 1-4, we can draw the following conclusions: this method is incapable of making transformer radial core columns, and the core cake made by this method also has many defects

Images