Electromagnetic coil
An electromagnetic coil with improved insulation properties at high temperatures. A bobbin is insulated by a thin ceramic composite layer that is produced by winding a glass or ceramic fiber over the support structure and impregnating it with a pre-ceramic polymer. The pre-ceramic polymer is then modified to form a ceramic SiO 2 matrix around the fibrous layer. The ceramic matrix secures the glass or ceramic fibers in place and produces a dense layer. A ceramic coated magnet wire is then wound around the insulated support structure. The magnet wire is a conductor that is spiral-wrapped with a glass fiber impregnated with a pre-ceramic polymer.
1. An electromagnetic coil, comprising:
a support structure;
a first layer disposed on the support structure, the first layer comprising a first polymer resin that has been thermally decomposed to leave an inorganic portion of the polymer; and
a second layer disposed about the first layer, the second layer comprising a conductor and a second polymer resin that has been thermally decomposed to leave an inorganic portion of the polymer.
2. The electromagnetic coil of claim 1 , wherein the first layer comprises glass or ceramic fiber filaments.
3. The electromagnetic coil of claim 1 , wherein the first layer further comprises ceramic filler powder.
4. The electromagnetic coil of claim 1 , wherein each of the first and second polymer resins comprises at least one of: polysiloxane or polysilazane.
5. The electromagnetic coil of claim 1 , wherein the conductor comprises:
a conductive wire having an outer cladding comprising glass fiber filaments.
6. An electromagnetic coil, comprising:
a support structure;
a first layer disposed on the support structure, the first layer comprising fiber and a first polymer resin that has been thermally decomposed to leave an inorganic portion of the polymer; and
a second layer disposed about the first layer, the second layer comprising a conductor and a second polymer resin that has been thermally decomposed to leave an inorganic portion of the polymer.
7. The electromagnetic coil of claim 6 , wherein the fiber comprises glass filaments.
8. The electromagnetic coil of claim 6 , wherein the first layer further comprises ceramic filler powder.
9. The electromagnetic coil of claim 6 , wherein at least one of the first and second polymer resins comprises at least one of: polysiloxane or polysilazane.
10. The electromagnetic coil of claim 6 , wherein at least one of the decomposed first and second polymer resins comprises SiO 2 .
11. The electromagnetic coil of claim 6 , wherein the conductor comprises: a conductive wire having an outer cladding comprising glass fiber filaments.