Magnetic core for electrical transformers

Details Magnetic core for electrical transformers Magnetic core for electrical transformers

1979-09-28

1980-12-23

Kozma, Thomas J.

Inductor devices

Core joint structure

Overlapping laminations

336218, 336234, H01F 2724

Patent

active

042413249

ABSTRACT:
A unique core for an electrical transformer and method of construction thereof is disclosed which is applicable to either shell-form or core-form transformers of either single-phase or multi-phase application. The cross sectional area of the outside core leg and a portion of the yoke outside the electrical coil of the transformer is increased thereby decreasing the magnetic induction of that portion of the core with a concomitant reduction in electrical losses and noise. The structure comprises leg and yoke stacks formed of lamina of grain-oriented steel that are stacked in a laminar relationship such that adjoining edges of the leg and yoke members are periodically overlapped to enhance flux transfer. The core is stacked in such a fashion such that the outside leg members (outside the electrical coil) have additional laminar members periodically interspersed so that there are more outside leg lamina than inside leg lamina thereby increasing the cross-sectional area of the outside legs. Because the unequal leg and yoke lamina produces voids in the core and "sagging" of the laminations, each time an additional outside leg lamina is stacked, a yoke spacer lamina that is shorter than the other yoke lamina but varied in length between minima at the top and bottom of the stack and maximum at center-stack is placed adjacent the extra leg lamina so that the yoke is tapered from the wider outside leg to the narrower inside leg.

REFERENCES:
patent: Re13830 (1914-11-01), Wolcott et al.
patent: 527070 (1894-10-01), Packard
patent: 1013150 (1912-01-01), Fortescue
patent: 1091995 (1914-03-01), Wolcott et al.
patent: 1170201 (1916-02-01), Weed
patent: 2340081 (1944-01-01), Sauer
patent: 2997567 (1961-08-01), Connelly
patent: 3173117 (1965-03-01), Franklin

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