Electric coil and method of manufacturing an electric coil
AssigneeRolls-Royce Deutschland Ltd & Co KG
InventorsPeter GRÖPPEL, Theo KAFFENBERGER, Markus WILD
Life of this patent
Estimating the term…
Abstract
An electrical coil includes a winding wire that is wound to form a plurality of coil turns. The winding wire has a strand that includes a multiplicity of thin, twisted individual wires, and the strand is sheathed with a turn insulation. Additionally, a fixing band is wound around the coil turns in at least one portion, wherein the fixing band, when the coil has been compressed, locally encases and geometrically fixes the coil turns. The disclosure also relates to the associated method for producing the electrical coil for a single tooth of a stator, wherein the coil is produced on a dummy winding body and is subsequently mounted onto the tooth.
Claims21
An electrical coil comprising:
- a winding wire that is wound to form a plurality of coil turns,
- wherein the winding wire has a strand that comprises a multiplicity of twisted individual wires, and wherein the strand is sheathed with a turn insulation,
- wherein the plurality of coil turns is wound in at least one portion with a fixing tape that, in a compressed state of the electrical coil, locally envelops and geometrically fixes the plurality of coil turns,
- wherein the turn insulation comprises a porous, compressed material that is electrically insulating.
- wherein the turn insulation and the strand are impregnated with a resin,
- wherein the resin fills the turn insulation and a free volume of the strand via the turn insulation, and
- wherein the electrical coil is configured to be applied to a winding former of an individual tooth of a stator.
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An electrical machine comprising:
- a rotor;
- and
- a stator, comprising a plurality of coils,
- wherein each coil of the plurality of coils is applied to a winding former of an individual tooth of the stator.
- wherein each coil of the plurality of coils comprises a winding wire that is wound to form a plurality of coil turns,
- wherein the winding wire has a strand that comprises a multiplicity of twisted individual wires,
- wherein the strand is sheathed with a turn insulation,
- wherein the plurality of coil turns is wound in at least one portion with a fixing tape that, in a compressed state of the respective coil, locally envelops and geometrically fixes the plurality of coil turns,
- wherein the turn insulation comprises a porous, compressed material that is electrically insulating.
- wherein the turn insulation and the strand are impregnated with a resin, and
- wherein the resin fills the turn insulation and a free volume of the strand via the turn insulation.
A method for producing an electrical coil, the method comprising:
- winding a winding wire having a strand that comprises a multiplicity of twisted individual wires and is provided with a turn insulation to form a coil having a multiplicity of coil turns, wherein the turn insulation comprises a porous, compressible material that is electrically insulating, wherein the turn insulation maintains an electrical insulation after compression of the porous, compressible material, and wherein the winding wire is wound onto a dummy winding former;
- compressing the coil at least in a direction of a coil axis, wherein, the strand of the winding wire is compacted and individual coil turns of the multiplicity of coil turns are pressed against one another, such that the assumes a compacted state;
- winding at least one curable fixing tape around the multiplicity of coil turns before or after the compressing of the coil, wherein the at least one curable fixing tape comprises a curable composite material:
- curing the at least one curable fixing tape to provide a cured fixing tape, wherein the cured fixing tape fixes the coil in the compacted state;
- removing the coil from the dummy winding former;
- and
- applying the coil to a winding former of an individual tooth, wherein the winding former of the individual tooth comprises a laminated core, and the coil is inserted into a slot of the laminated core;
- and
- impregnating the coil, wherein the turn insulation and the strand of the winding wire are impregnated with a resin, and wherein the resin fills the turn insulation and a free volume of the strand via the turn insulation.
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Dependencies are inferred from the claim text.