Method of making a self-supporting wire coil
AssigneeSiemens Aktiengesellschaft
InventorsOtto Olbrich, Wilhelm Brand
Life of this patent
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Abstract
A wire is wound on a coil body form about a removable mandrel in a first layer in which the turns abut one another. A guide ring reverses the direction of lead of the wire to form a second, overlying layer in which the turns are spaced a short distance apart from one another. The final turns of the outer layer engage about the coil form. A casting agent applied to the coil penetrates the turns of the second and first layers and is hardened. The mandrel is removed and the coil is self-supporting, for use as in a moving-coil motor. A fiberglass sheet may optionally be applied about the first layer before the second layer is wound thereover to increase the strength of the coil.
Claims10
A method of producing a wire coil which is self-supporting over at least a principal part of its length, comprising the steps:
- winding the wire into a first annular layer of axially-abutting turns with a uniform lead in a first direction;
- winding the wire into a second annular layer of turns overlying the first layer and having a lead in a second direction, the turns being spaced slightly apart from one another in a direction axial of the coil formed thereby;
- and
- applying a casting agent to the coil, whereby the agent penetrates about and between the turns of the second and first layers of the coil before hardening.
A method for the production of a self-supporting coil of electrically conductive wire extending from a coil body having an axially-extending collar on one side of the body and employing a mandrel form receivable radially within the collar of the body and extending to one side thereof, comprising the steps:
- inserting the mandrel partially into said coil body radially inwardly of said collar;
- winding said wire upon said mandrel in a first direction and in a first layer with axially-adjacent turns of said wire abutting one another and a first turn abutting an axial edge of said collar;
- winding said wire in a second layer and in a second direction from an end of said first layer and back to and about said collar of the coil body, with axially-adjacent turns of said wire being spaced apart from one another;
- depositing a casting agent upon said second layer of wire, whereby said agent penetrates between the turns of second layer and also between the turns of the first layer and hardens;
- and
- withdrawing the mandrel from inside the completed coil and coil body,
- whereby a coil is produced which supports itself in axial relation to the coil body.
Dependencies are inferred from the claim text.