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AssigneeASEA Aktiebolag
InventorsArne Hjortsberg, Goran Holmstrom, Thommy Karlsson
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A coil for arrangement in slots in a stator or rotor of an electrical machine, in particular a high voltage coil, comprising a bundle (17) of a plurality of conductors (18) located adjacent to each other and provided with a conductor insulation (19) for insulation of the conductors from each other as well as a main insulation (14) surrounding the bundle for insulation of the bundle against the machine slot. The main insulation consists of a wrapping of a tape- or sheet-formed insulating material wound in several layers around the bundle and comprising a layer with small mica flakes which, as well as the spaces between layers of mica flakes in the wrapping, contains a cured impregnating resin. At least that part of the impregnating resin located in the spaces between mica layers contains particles of a filler with an intrinsic thermal conductivity of at least 5 W/mK, such as aluminium oxide or boron nitride, and with a grain size of the particles of 0.1-15 .mu.m in at least 90 percent of the filler.
A coil for arrangement in a slot for a coil in an electrical machine comprising a bundle of a plurality of conductors arranged adjacent to each other and provided with a conductor insulation for insulation of the conductors from each other as well as a main insulation surrounding the bundle for insulation of the bundle against said slot, said main insulation comprising a wrapping of a flat insulating material which is wound in several layers around the bundle and which comprises a layer with small mica flakes, said wrapping including spaces between said layers with small mica flakes, said layers with small mica flakes and said spaces containing a cured impregnating resin, and wherein at least the impregnating resin located in said spaces contains particles of a filler having an intrinsic thermal conductivity of at least 5 W/mK and a particulate grain size of 0.1-15 .mu.m in at least 90 per cent by weight thereof.
Dependencies are inferred from the claim text.