METHOD FOR MANUFACTURING THREE-PHASE TRANSFORMER Russian patent published in 2017 - IPC H01F41/02 H01F27/25 

FIELD: electricity.

SUBSTANCE: steel strips are used to assemble the magnetic core. The strips are put into blocks, obtaining six blocks. Formation of packs from the blocks is carried out. When forming packs, three packs are obtained, in each of which a magnetic core leg is made in the form of an average pack portion. On each leg windings are installed by frameless winding of wire with tension on it and with the provision of a pulling force to the magnetic core. Each block is collected from M subpacks with M≥2. Each subpack is collected from N strips with N≥1 of the same width. Width of strips in various subpacks for the same block is different. The subpacks with the widest strips are located in the middle of the pack. The subpacks in the blocks are arranged with a reduction in the width of the strips in the direction from the middle of the pack to its edge. The blocks are characterized by cross sections at the portion of the leg symmetrical with respect to the plane passing through the center of the pack and parallel to the surface of the strips. The cross section of the magnetic core on the leg section has a stepped shape similar to ellipse or circle. The length of the strips in the pack and their location relative to each other are chosen to ensure tight enveloping of the windings installed on the legs with the magnetic core. The strips are connected by enveloping the preinstalled windings with the magnetic core and keeping the order of their placement in the block. The ends of each of the strips are connected. The strip ends of each block of the middle pack are toe-to-toe connected to the ends of the corresponding strips of the nearest blocks of the outermost packs. This forms the sections of the magnetic core, which perform the yoke function. The toe-to-toe connection of the ends is carried out with the localization of the connection of the ends of the corresponding strips relative to the connections of the ends of the nearest adjacent corresponding strips in different places. The ends of the corresponding strips of distant blocks of the outermost packs are also connected toe-to-toe. This forms the sections of the magnetic core, which perform the yoke function. The toe-to-toe connectiont of the ends is carried out with the localization of the ends of the corresponding strips relative to the connections of the ends of the nearest adjacent corresponding strips in different places.

EFFECT: reduced inductance of scattering, reluctance of cable, magnetoresistance and noise level, improved heat removal from internal rows of winding and increased efficiency.

15 cl, 4 dwg