Coil shape comprising an H-shaped coil core
AssigneeU.S. Philips Corporation
InventorsWillem Johannes Postma, Hans Tielrooy, Johannes Hubertus Tobben
Life of this patent
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Abstract
A coil shape comprising: A. an H-shaped ferromagnetic core B. a coil former of synthetic material. The coil former is moulded about the H-shaped core and is provided with grooves such that the mechanical stresses produced by the shrinking of the coil former are completely or substantially removed.
Claims9
A coil frame comprising an H-shaped ferromagnetic coil core having a central connecting piece on both sides of which a leg is formed, a coil former made of synthetic material which is moulded about said coil core and comprising a coil can which envelops the central connecting piece and a U-shaped trough formed on both sides of the coil can, each leg of the coil core being located within a trough so that each trough encloses a respective leg of the coil core on three sides whereby an uninterrupted side of each leg of the coil core is maintained free from synthetic material, the ends of the legs being maintained free from synthetic material, the coil can including at least one groove recessed therein and extending over the entire length of the coil can, and at least two grooves recessed in each trough of synthetic material on the outside with the grooves extending transverse to the longitudinal direction of the legs of the H-shaped coil core.
A coil core comprising an H-shaped member of ferromagnetic material having a pair of legs and a connecting cross bar member, a coil former composed of a synthetic material molded about said H-shaped member and comprising a first support member that closely envelops said cross-bar member and first and second elongate U-shaped members located on opposite sides of said first support member so as to partially enclose respective ones of said pair of legs and leaving at least one end and one surface of each leg uncovered, a groove recessed in said first support member and extending approximately parallel to the longitudinal axis of the cross bar member, a plurality of grooves recessed in one outside surface of each U-shaped member and extending transverse to the longitudinal axis of the respective leg of the H-shaped member thereby to materially reduce any mechanical stresses tending to occur in said H-shaped core during the molding process of the coil former.
Dependencies are inferred from the claim text.