Ferromagnetic multiple shell core for electric coils
First Claim
Patent Images
1. A ferromagnetic shell core for a plurality of electric coils comprising:
- a cylindrical bottom core wall, a plurality of concentrically closed ring-shaped spaced side core walls and a central core extending from said bottom core wall;
said bottom core wall, central core and side core walls being ferromagnetic material; and
a plurality of concentrically arranged recesses formed between said bottom core wall, said central core and one of said side core walls and between said bottom core wall and each of said side core walls, each for housing windings of a respective coil,wherein the bottom core wall includes a substantially planar surface, said recess located closest to the central core terminating in said bottom core wall a further distance from said substantially planar surface than said recess located further away from the central core to provide increasing amounts of core material from a point between said substantially planar surface and an outermost recess to the central core.
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Abstract
A ferromagnetic multiple shell core for a plurality of electric coils has multiple recesses arranged concentrically with respect to one another and separated from one another by concentrically arranged side walls. A central core is provided at a center-point of the concentrically arranged recesses and side walls. The base of the cylindrical shell core has appropriate thickness below each recess to minimize radial tapering of magnetic flux.
72 Citations
12 Claims
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1. A ferromagnetic shell core for a plurality of electric coils comprising:
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a cylindrical bottom core wall, a plurality of concentrically closed ring-shaped spaced side core walls and a central core extending from said bottom core wall;
said bottom core wall, central core and side core walls being ferromagnetic material; anda plurality of concentrically arranged recesses formed between said bottom core wall, said central core and one of said side core walls and between said bottom core wall and each of said side core walls, each for housing windings of a respective coil, wherein the bottom core wall includes a substantially planar surface, said recess located closest to the central core terminating in said bottom core wall a further distance from said substantially planar surface than said recess located further away from the central core to provide increasing amounts of core material from a point between said substantially planar surface and an outermost recess to the central core. - View Dependent Claims (2, 3, 12)
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4. An inductive close-range transmitter system comprising:
- a first and second shell core each having a cylindrical bottom core wall, a plurality of concentrically closed ring-shaped spaced side core walls and a central core extending from said bottom core wall;
said bottom core wall, central core and side walls being ferromagnetic material; anda plurality of concentrically arranged recesses formed between said bottom core wall, said central core and one of said side core walls and between said bottom core wall and each of said side core walls, each housing a respective coil, wherein the bottom core wall includes a substantially planar surface, said recess located closest to the central core terminating in said bottom core wall a further distance from said substantially planar surface than said recess located further away from the central core to provide increasing amounts of core a point between said substantially planar surface and an outermost recess the central core. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
- a first and second shell core each having a cylindrical bottom core wall, a plurality of concentrically closed ring-shaped spaced side core walls and a central core extending from said bottom core wall;
Specification