Methods of constructing electrical coils
阅读：371发布：2022-04-01
专利汇可以提供Methods of constructing electrical coils专利检索，专利查询，专利分析的服务。并且A method of constructing electrical coils of the cylindrical type for high temperature dry type transformers, wherein the coil collars are formed of a plurality of first and second plies of insulating materials stacked in a predetermined sequence to a predetermined build dimension. At least the first plies are impregnated with a thermosettable resin which has been advanced to an intermediate state, still fusible but dry to the touch, and which is subsequently cured to a solid infusible state to consolidate the collars into unitary laminated assemblies.，下面是Methods of constructing electrical coils专利的具体信息内容。
1. A method of constructing an electrical winding assembly, comprising the steps of: providing a winding form, cutting a plurality of first plies of like predetermined configuration from a fibrous sheet of insulating material impregnated with a thermosettable resin in a heat fusible stage which is dry to the touch, cutting a plurality of second plies having said predetermined configuration from A sheet of asbestos, stacking a predetermined number of said first and second plies in a predetermined sequence to provide a first stack having a predetermined build dimension, wrapping the first stack about the winding form to provide a first insulating collar, winding an insulated electrical conductor about the winding form, to provide a coil assembly having first and second ends, with the first end starting at the first insulating collar, stacking a predetermined number of said first and second plies in a predetermined sequence to provide a second stack having a predetermined build dimension, wrapping the second stack about the winding form at the second end of the coil assembly, to provide a second insulating collar, and heating said first and second insulating collars to cure the heat fusible resin in the first plies to a solid, infusible state.
2. The method of claim 1 including the steps of impregnating the coil assembly, including the first and second insulating collars, with a liquid resinous composition, and curing the resinous composition to an infusible solid.
3. The method of claim 1 wherein the length dimension of the first and second plies is less than the circumferential dimension of the winding form, providing a predetermined gap between the ends of the first and second stacks of plies when the stacks are wrapped about the winding form, and including the steps of forming leads on the first and second ends of the coil assembly by directing the coil conductor through the gap provided in the first and second insulating collars.
4. The method of claim 1 wherein the steps of stacking the first and second plies to form the first and second stacks include placing the first plies at both outer sides of the stack.
5. The method of claim 1 including the steps of taping the first and second stacks to the winding form after the steps of wrapping the first and second stacks about the winding form.
6. The method of constructing an electrical winding assembly, comprising the steps of: providing a winding tube, cutting a plurality of first plies of like predetermined configuration from a fibrous sheet impregnated with a thermosettable resin which is in the heat fusible B-stage, cutting a plurality of second plies having said predetermined configuration from a sheet of asbestos, winding an insulated electrical conductor about said winding tube to provide an electrical coil having first and second ends, providing first and second insulating collars on said winding tube on the first and second ends of said electrical coil, respectively, with each of said first and second insulating collars including both said first and second plies disposed in stacked, superposed relation, in a predetermined sequence, with the first plies being disposed at the outer sides of the stack, and heating said first and second insulating collars to cure the heat fusible resin in said first plies to a non-fusible solid.
7. The method of claim 6 including the steps of impregnating the coil assembly, including the first and second insulating collars, with a liquid thermosettable resinous composition, and curing the resinous composition to a non-fusible solid.
8. The method of claim 6 wherein the length dimension of the first and second plies is less than the circumferential dimension of the winding tube, providing a gap between the ends of the first and second collars, and including the steps of forming leads on the first and second ends of the coil assembly by directing the coil conductor through the gaps provided in the first and second collars.
9. The method of claim 6 including the steps of taping the first and second collars to the winding form, prior to the step of heating the collars to cure the heat fusible resin.
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