Intermediate transformer and dry electromagnetic device of using same

Abstract

The invention relates to the field of electromagnetic devices, in particular to an intermediate transformer and a dry-type electromagnetic device using the intermediate transformer. The intermediate transformer of the invention includes an iron core, and the iron core is wound into two stepped semi-cylindrical iron cores by winding a plurality of silicon steel strips with different widths. , the two stepped semi-cylindrical iron cores are synthesized into a "Sun" shape, and then a long silicon steel sheet is used to make a seamless whole. This structure does not require punching. After insulation treatment, the magnetic permeability and magnetic circuit are greatly improved. The length is short, the leakage reactance is small, the magnetic leakage is small, the accuracy can reach above 0.2, it is not easy to saturate, the saturation times can reach more than 3 times, and the no-load current can be less than 150MA, and the iron loss is below 10W; compared with the traditional core structure, it can save 20% silicon steel sheet and steel. In addition, the iron core, the primary main winding and the secondary winding are all enclosed in a casing made of insulating material, which effectively improves the insulation performance of the intermediate transformer.

Description

Technical field [0001] The invention relates to the field of electromagnetic devices, in particular to an intermediate transformer and a dry electromagnetic device using the intermediate transformer. Background technique [0002] The existing electromagnetic devices are all oil-immersed products, so the intermediate transformer uses oil as the insulating medium. The core structure of the intermediate transformer of the traditional electromagnetic device is punched and laminated by sheared silicon steel sheets. Such cores are bulky and consume a lot of materials. The process is complicated in the processing process, such as cutting, punching, punching, The effect of screw fastening and other material forces is that the internal material of the silicon steel sheet is damaged, so that the magnetic leakage, the permeability decrease, the eddy current increases, the no-load iron loss is high, the shortcomings and defects such as easy heat generation, large noise, and other technical i...

AI Technical Summary

Problems solved by technology

The core structure of the intermediate transformer of the traditional electromagnetic device is formed by punching and stacking sheared silicon steel sheets. Such a core is bulky and consumes a lot of material. Physical force such as screw fastening causes damage to the internal material of the silicon steel sheet, resulting in magnetic flux leakage, decreased magnetic permeability, increased eddy current, high no-load iron loss, easy heat generation, high noise and other deficiencies and defects, and affects technical indicators such as precision.

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