Foil Wound Transformer

Abstract

A foil wound transformer relates to the technical field of transformers. Foil-wound transformers include a transformer coil mold, a first-stage coil, and a second-stage coil. The transformer coil mold is provided with an annular winding slot, and the first-stage coil and the second-stage coil are wound in the winding slot. The first-stage coil and the second-stage coil are nested inside and outside, the first-stage coil is inside, and the second-stage coil is outside. The first-stage coil is a foil coil, which includes laminated metal foils and insulating layers. This foil-wound transformer also includes The insulating filler is filled in the gap between both sides of the first-level coil and the mold of the transformer coil to prevent the second-level coil from sinking into the gap. It avoids the influence of the withstand voltage between the windings due to the sinking of the winding of the second-stage coil, thus avoiding the accident of burning the transformer and improving the safety of the transformer.

Description

technical field [0001] The invention relates to the technical field of transformers. Background technique [0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. According to the different winding conductor structures, it can generally be divided into wire wound windings and foil windings. Foil winding uses copper or aluminum foil strips of different thicknesses as conductors, wide-band insulating materials as interlayer insulation, and narrow strip-shaped insulating materials as end insulation. The winding is completed on a foil winding machine to form a foil winding. coil. [0003] In the existing foil-wound transformers, when the foil coil is wound, the wire slot of the transformer coil mold is generally wrapped around and wound in the middle. However, for the current existing foil windings, in order to facilitate winding, the left and right widths of the foil coils will be slightly smaller than the left and righ...

AI Technical Summary

Problems solved by technology

However, for the current existing foil windings, in order to facilitate winding, the left and right widths of the foil coils will be slightly smaller than the left and right widths of the slots. Therefore, after the foil windings are wound, the left and right sides of the slots will form Gaps, resulting in winding the enameled wire of the secondary coil, because the enameled wire is linear, the enameled wire may sink into the gap, affecting the withstand voltage between the windings, and easily causing the transformer to burn, which is not safe enough

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