Transformer radial core column forming device

Abstract

The invention relates to a transformer radiant-type core limb forming device, which comprises a mold base, a plurality of mold cavity plates, two mold end plates and multiple sets of sheet pressing components. The mold base consists of two mold frames. The mold cavity plates and the two mold end plates are vertically and fixedly arranged at intervals along the length direction of the two mold frames. The middle part of each mold cavity plate is provided with a semicircular concave part. All semicircular parts form a semicircular mold cavity for receiving silicon steel sheet materials. The two mold end plates are respectively arranged on the end surfaces of the connecting ends of the two mold frames to form a baffle for the semicircular mold cavity. Two sets of sheet pressing components are respectively arranged at the tops of the two sides of each mold cavity plate. Not only can the device be used for fabricating core limbs with any specification, but also the produced core limb has the advantages that the lamination factor and the effective magnetic conducting section are high, the parallelism between all silicon steel sheet materials and radial magnetic force lines is good, the eddy-current loss is small, and the situation that electromagnetic noises are produced due to vibration among sheets can be avoided even though the product which is produced by using the device is influenced by alternating-current fundamental waves in alternating magnetic field application.

Description

【Technical field】 [0001] The invention belongs to a forming device for a magnetically conductive core, in particular to a forming device for manufacturing a radial 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 is comp...

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 thinness 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 1-4 points, we can draw the following conclusions: this method is incapable of making the radial iron core column of the transformer of the present invention, and the iron core cake made by this method also has many defects.

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