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US 4,160,926 AGranted
Materials and impregnating compositions for insulating electric machines
AssigneeThe Epoxylite Corporation
InventorsLloyd S. Cope, Ladislav J. Rejda
Life of this patent
Estimating the term…
Abstract
Void-free resin impregnated electric motors and generators, the process for producing their void-free resin impregnation and a preferred resin for producing void-free impregnation including a low viscosity, essentially 100 percent solids (i.e. solventless) synthetic resinous material, a thixotropic agent, a surface active agent and/or a diluent are disclosed.
Claims18
A random wound electric machine having a stator impregnated with a cured impregnating material comprising:
- (a) a plurality of slots contained in said stator, each slot having a wall which defines a channel into which electrical coils are inserted through an opening in the stator;
- (b) a plurality of windings contained in each of said slots;
- (c) a layer of material disposed within each of the slots which encircles the windings within each slot and bridges the opening of each slot, the layer of material comprising a layer of insulative material disposed in contact with the wall of the slot and a first layer of fabric in contact with the layer of insulative material which is wettable, impregnatable and compressible, having a free surface energy greater than the surface tension of the impregnating material used for its impregnation and having capillary sized interstices disposed within the fabric which retain the impregnating material to produce a substantially void free fill of impregnating material between the fabric and the windings, the fabric being compressed by contact with the windings to substantially fill voids disposed between the wall and the windings with the fabric;
- (d) the layer of material disposed within each of the slots comprising a slot liner and a reinforcing layer which bridges the opening in the stator for each slot, the slot liner and reinforcing layer each including the first fabric layer compressed by the windings, the reinforcing layer also including a second fabric layer compressed by contact with the first fabric layer of the slot liner, and having capillary sized interstices which retain the impregnating material to produce a substantially void free fill of impregnating material between reinforcing material and the windings;
- and
- (e) the fabric layer being wetted by the impregnating material prior to curing and impregnated with cured impregnating material by retention of the impregnating material within the capillary sized interstices.
3 more elements
A random wound electric maching having a stator impregnated with a cured impregnating material comprising:
- (a) a plurality of slots contained in the stator, each slot having a wall which defines a channel into which electrical coils are inserted through an opening in the stator;
- (b) a plurality of windings contained in each of the slots;
- (c) a slot liner disposed in each of the slots between the wall and the windings;
- (d) each slot liner comprising a layer of insulative material disposed in contact with the wall of the slot and a layer of fabric in contact with the layer of insulative material, the layer of fabric being wettable, impregnatable and compressible, having a free surface energy greater than the surface tension of an impregnating material used for its impregnation, having capillary sized interstices disposed within the fabric which retain the impregnating material to produce a substantially void free fill of impregnating material between the slot liner and the windings;
- and having a uncut pile and a backing, said backing being bonded to said layer of insulative material and said pile being in surface contact with said coils;
- (e) the fabric being compressed by contact with the windings to substantially fill voids disposed between the wall and the windings with the fabric;
- and
- (f) the fabric being wetted by the impregnating material prior to curing of the impregnating material and impregnated with cured impregnating material retained within the cpaillary sized interstices of the fabric.
5 more elements
A random wound electric machine having a stator impregnated with a cured impregnating material comprising:
- (a) a plurality of slots contained in the stator, each slot having a wall which defines a channel into which electrical coils are inserted through an opening in the stator;
- (b) a plurality of windings contained in each of the slots;
- (c) a slot liner disposed in each of the slots between the wall and the windings;
- (d) each slot liner comprising a layer of insulative material disposed in contact with the wall of the slot and a layer of fabric in contact with the layer of insulative material, the layer of fabric being wettable, impregnatable and compressible, having a free surface energy greater than the surface tension of an impregnating material used for its impregnation, having capillary sized interstices disposed within the fabric which retain the impregnating material to produce a substantially void free fill of impregnating material between the slot liner and the windings;
- and having a cut pile and a backing, said backing being bonded to said layer of insulative material and said pile being in surface contact with said coils;
- (e) the fabric being compressed by contact with the windings to substantially fill voids disposed between the wall and the windings with the fabric;
- and
- (f) the fabric being wetted by the impregnating material prior to curing of the impregnating material and impregnated with cured impregnating material retained within the capillary sized interstices of the fabric.
5 more elements
Dependencies are inferred from the claim text.