A kind of manufacturing method of radial iron core cake

Abstract

Provided is a method for manufacturing a radial iron core cake. The method includes the steps of cut sheet arranging, centrifugal sheet arraying and circle-narrowing forming. Magnetic conduction silicon steel sheets with different sheet widths are arrayed on a plate surface of a bearing plate in a radial mode, the bearing plate is rotated at a high speed so that all the sheets can be thrown to the outer edge of the plate surface under the action of centrifugal force to form a neat and loosely-arrayed sheet circle, an outer circle and partition plates are removed, a steel wire rope ring is fastened and a prefabricated insulating fixed ring is sleeved with the fastened steel wire rope ring after a central circle fixing pipe and a ground lead are inserted, the steel wire rope ring and the central circle fixing pipe are detached, and then the perfect-circle radial iron core cake is formed. According to the method, all the sheets are synchronously gathered towards the central circle fixing pipe under the action of constant-pressure even tightening force so as to be tightly extruded towards one another within the set circumferential range, and therefore the sheet overlapping coefficient and effective cross section filling rate are greatly increased. The practical test shows that electromagnetic noise caused by vibration among the sheets can not occur even when an electric reactor product formed by the iron core cake is influenced by electromagnetic force in an alternating magnetic field.

Description

【Technical field】 [0001] The invention belongs to a method for making a radial iron core cake. 【technical background】 [0002] At present, the structure of the radial iron core cake for the reactor is as follows: figure 1 As shown, the figure shows a cross-sectional structure of an iron core cake composed of 16 groups of magnetically permeable silicon steel sheets with different sheet widths. Each group decreases from the longest piece b to the shortest piece c, and all the pieces Arranged in a height-to-extrusion manner. Before the present invention was made, during production, the sheet material group was manually inserted into a prefabricated casting and curing mold, and then the resin filler was cast and solidified to form. The radial iron core cake made by this method has the following problems: 1. Time-consuming and labor-intensive, the efficiency is low, and each iron core cake needs to be equipped with a casting and solidifying mold, and the manufacturing cost is h...

AI Technical Summary

Problems solved by technology

The radial iron core cake made by this method has the following problems: 1. Time-consuming and labor-intensive, the efficiency is low, and each iron core cake needs to be equipped with a casting and curing mold, and the production cost is high

2. Due to relying on manual insertion, there is no external force in the radial direction. Therefore, the sheets are relatively loose, and can only be filled and solidified by resin fillers, which cannot achieve the lamination coefficient required by the design, thereby reducing the effective magnetic cross section.

3. During the operation of the reactor made of this core cake, due to the inconsistent expansion coefficients of the silicon steel sheet and the resin filler, when the temperature of the core cake rises, cracks will occur due to the resin filler, which will seriously affect the performance of the equipment. operational reliability

4. From figure 1 It can be seen that first, only the longest piece b is arranged radially with the center hole a as the center, while other silicon steel sheets have an off-angle relative to the center hole a, that is, the same as figure 2 There is a deflection angle in the amplitude magnetic field lines, so there is a defect that the magnetic field lines pass through the silicon steel sheet to generate eddy current loss

The second is that on the outer circumference, the outer end surface of each piece of material does not form a perfect circle, which is uneven, so that the pieces cannot be compressed tightly, so that the equipment is affected by the fundamental wave of the alternating current in the alternating magnetic field, and the pieces are prone to vibration. emit electromagnetic noise

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