Inductor devices – Coil or coil turn supports or spacers – Flexible filament – strip or sheet insulation
Patent
1982-03-03
1984-09-11
Kozma, Thomas J.
Inductor devices
Coil or coil turn supports or spacers
Flexible filament, strip or sheet insulation
336 60, 336223, H01F 2728
Patent
active
044713355
ABSTRACT:
To reduce the ohmic losses in a sheet-wound transformer or reactor winding, edge regions of at least some of the turns of the conductor sheet forming the winding are located at a different distance from the geometric axis of the winding compared with the distance from said axis of a central conductor portion in a respective one of said turns. Preferably the conductor sheet in each turn substantially follows the flux lines for the resultant magnetic leakage flux which corresponds to a constant current density in the sheet. For example, the winding may be wound from a metallic foil whose edge regions are folded back on themselves, or end regions of the winding may be provided with inter-turn packings (e.g. of tape) to achieve the desired flared shape of the turns at the ends of the winding.
REFERENCES:
patent: 1331077 (1920-02-01), Moody
patent: 1825105 (1931-09-01), Terman
patent: 3464043 (1969-08-01), Benko et al.
patent: 3634800 (1972-01-01), Fisher
patent: 3691498 (1972-09-01), Zwelling et al.
patent: 3928832 (1975-12-01), Forsberg et al.
patent: 4259654 (1981-03-01), Persson et al.
Moritz Bertil
T/o/ nnesen Ole
Asea AB
Kozma Thomas J.
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