Method for partially cured insulators for electromagnetic systems
View Patent ↗A method of fabricating an electric machine stator includes inserting one or more electrical coils into a form and partially curing the one or more electrical coils. The method also includes populating the electric machine stator with the one or more electrical coils and curing the electric machine stator with one or more electrical coils.
1. A method of fabricating an electrical coil for use in an electric machine stator, the method comprising:
inserting the electrical coil into a mechanical form;
impregnating the electrical coil using a vacuum pressure impregnated (VPI) process;
partially curing the electrical coil;
storing the electrical coil in the partially cured state; and
removing the electrical coil from storage and installing the electrical coil into the electric machine stator while the electrical coil is in the partially cured state.
2. The method of claim 1 wherein the electrical coil is partially cured in the VPI chamber.
3. The method of claim 1 wherein partially curing the electrical coil comprises applying an external heat source to the mechanical form.
4. The method of claim 1 wherein the mechanical form includes an integral heat source, and wherein partially curing the electrical coil comprise applying heat to the electrical coil using the integral heat source.
5. The method of claim 1 wherein partially curing electrical coil comprises flowing electrical current through the electrical coil.
6. The method of claim 1 wherein at least a portion of partially curing the electrical coil is performed at atmospheric pressure.
7. The method of claim 1 wherein at least a portion of partially curing the one or more electrical coils is performed at elevated pressure.
8. The method of claim 7 wherein the electrical coil comprises slot portions and end-turn portions, and wherein slot portions are wrapped in at least one of a mica tape, a semi-conductive tape, an insulating slot liner, or a semi-conductive slot liner prior to being inserted into the mechanical form.
9. The method of claim 8 wherein the end-turn portions are wrapped in at least one of a mica tape, or a semi-conductive tape prior to being inserted into the mechanical form.
10. The method of claim 9 wherein the mechanical form sets the shape of only the slot portions of the electrical coil.
11. The method of claim 9 wherein the mechanical form sets the shape of both the slot portions and the end-turn portions of the electrical coil.