Open type rolling iron core and manufacturing method

Abstract

The iron core is pieced together from iron cores with simple frame in same or near shape. Each simple frame is prepared by winding one or several pieces of silicon steel strip. Characters are that layered stagger cutting yoke part of wound closed single frame forms kerf composed of multiple short slots distributed in stagger positions. Opening up cut slots layer-by-layer forms a U shaped frame with an opening. Stagger lapping opening parts of U shaped frames forms an iron core with simple frame in closed magnetic circuit. Advantages are: fine capability, low noise, saving material, low cost. Comparing with transformer in lamination type, the disclosed transformer is structured with opened iron core so that coil can be wound alone and replaced easily. Moreover, iron core is prepared by winding and cutting so that it is easy to manufacture iron core.

Description

technical field [0001] The present invention relates to an open wound iron core used in transformers, transformers and the like and its manufacturing method. Background technique [0002] Most of the iron cores used in electrical appliances such as transformers are made of silicon steel sheets or steel strips, and the manufacturing methods mainly include lamination and winding. [0003] At present, the iron cores used for large and medium-sized transformers with a capacity of more than 1000kVA are generally laminated iron cores, which are made of silicon steel sheets stacked in a certain shape. Because the silicon steel sheets are not tight enough, there is air in the magnetic circuit. gap, and the direction of high magnetic permeability of local materials is inconsistent with the direction of the magnetic circuit, which makes the performance of the iron core poor, and the transformer made of it has high no-load loss and high noise. [0004] In order to overcome the defects...

AI Technical Summary

Problems solved by technology

[0005] 1) When winding the transformer coil, the wound iron core must be carried for winding, that is, the coil winding process is operated on the iron core, which brings great difficulties to the winding and affects the production efficiency, especially for Large and medium-sized transformers cannot even be wound with iron cores

[0006] 2) During the use of the transformer, if the coil is damaged, it is impossible to remove the coil from the iron core for replacement, causing the entire transformer to be scrapped

Compared with the three-dimensional triangular iron core with circular cross-section or polygonal cross-section in terms of performance, it has more than 15% higher loss and more than 10% higher manufacturing cost, and there are also disadvantages such as three-phase imbalance and large third harmonic component.

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