For electric ei transformer core laminations with a capacity greater than 3 150kVA, it is generally used to rely on calipers, backings and other tooling positioning, single or double lamination. The positioning reference of this process is one or several end faces preset by the operator, and the other three core columns are aligned with the silicon steel sheet cutting ports. Drag one or two pieces each time, and measure and correct after repeated placement.
Compared with the conventional coil core, the ei transformer core lamination has small no-load loss and no-load current, and the manufacturing process is simple. Since silicon steel has a high magnetic permeability, it is widely used in the manufacture of electric motors, transformers, and the like. Because the whole ferromagnetic material will generate large eddy current inside, it is unfavorable for the transformer. To reduce the eddy current, it is necessary to make the ferromagnetic material into thin slices and stack them into the required cross-sectional area, so use the ei transformer. Iron core laminates are becoming more common.
At present, domestic transformer manufacturers generally use secondary or tertiary seam ei transformer core laminations, the core laminations are staggered at a certain distance, forming two parallel joints in the staggered area, of which two corresponding joints are spanned. Connected to a laminate. Since the magnetic reluctance of the air is several thousand times higher than the magnetic resistance of the silicon steel sheet, most of the magnetic flux in the lamination passes through the bridging lamination.