Inductor devices – Coil or coil turn supports or spacers – Coil on a preformed support or mount
Patent
1979-04-09
1981-02-10
Kozma, Thomas J.
Inductor devices
Coil or coil turn supports or spacers
Coil on a preformed support or mount
24211841, H01F 2730
Patent
active
042504791
ABSTRACT:
A transformer bobbin assembly having a first bobbin piece dimensioned to accommodate at least one additional bobbin piece within its central cavity. Each bobbin piece having a pair of flanges, one at each end and perpendicular to its central cavity, defining a channel around the outer surface of the bobbin piece to accommodate a single coil winding. The surface distance over the flange of the larger bobbin piece from the end of its cavity to the top of the flange plus the thickness of this flange is selected to provide at least the minimum creepage and clearance distances required by a selected industrial safety standard.
If two bobbin pieces, each being fully insertable within the interior cavity of the larger bobbin piece, are utilized, the necessary creepage and clearance distances between the coil wound on each of these nesting bobbin pieces is provided by a web within the cavity of the larger bobbin piece. This web is centrally located within and parallel to the flanges of the larger bobbin piece. In this configuration the larger bobbin piece is wide enough to fully accommodate both of the nesting bobbin pieces. The creepage and clearance distances here is twice the width plus the thickness of the web. Additionally, the outer flange of each of the nesting bobbins define a pair of lead wire holes for maintaining the desired creepage and clearance distances between each of these leads and the core of the finished transformer as required by the various industry safety standards.
REFERENCES:
patent: 2375309 (1945-05-01), McCoy
Bausch James F.
Brandt Burkhard A.
Sanford Craig A.
Hewlett--Packard Company
Jones Allston L.
Kozma Thomas J.
Wong Edward Y.
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