Oil-filled submergible electric pump motor with improved stator winding insulation

Claim 2

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer comprising an addition polymer, the stator structure comprising an insulation system, including said layer, having a 50% probability of failure at 185° C. in water-saturated oil that is at least 50% greater than 432 hours.

Claim 3

A motor in accordance with claim 1, wherein the insulating layer comprises a polybutadiene.

Claim 4

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer, the insulating layer comprising a polymer or copolymer of 1,3 butadiene having a high portion of 1,2 vinyl microstructure cross-linked with a polymer or copolymer of 1,3 butadiene having a low portion of 1,2 vinyl microstructure.

Claim 5

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer, the insulating layer comprising a polymer or copolymer of 1,3 butadiene having a high portion of 1,2 vinyl microstructure cross-linked with a polymer or copolymer of 1,3 butadiene having a low portion of 1,2 vinyl microstructure.

Claim 6

A motor in accordance with claim 3, wherein the insulating layer includes at least one vinyl monomer.

Claim 7

A motor in accordance with claim 4, wherein the insulating layer also includes an agent for promoting adhesion of the layer to the windings.

Claim 8

A stator structure for an oil-filled submergible electric pump motor impregnated by an impregnant produced by heat curing a liquid homopolymer or copolymer of 1,3 butadiene.

Claim 9

A stator structure for an oil-filled submergible electric pump motor impregnated by an impregnant produced by heat curing a liquid homopolymer or copolymer of 1,3 butadiene.

Claim 10

A stator structure in accordance with claim 6, wherein the stator structure is impregnated with said impregnant by vacuum impregnation prior to the heat curing.

Claim 11

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer, the insulating layer having the following composition: ______________________________________ Material Parts by Weight ______________________________________ 1. Resin type A 30-80 2. Monofunctional monomer 20-70 3. Multifunctional monomer 0-20 4. Resin type B 0-80 5. Initiator 0.1-10 6. Additive 0-5 ______________________________________ wherein the materials are defined as follows: 1. Resin type A--a high reactivity (50-98%) 1,2 vinyl content, homopolymer or copolymer of 1,3 butadiene

Claim 12

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer, the insulating layer having the following composition: ______________________________________ Material Parts by Weight ______________________________________ 1. Resin type A 30-80 2. Monofunctional monomer 20-70 3. Multifunctional monomer 0-20 4. Resin type B 0-80 5. Initiator 0.1-10 6. Additive 0-5 ______________________________________ wherein the materials are defined as follows: 1. Resin type A--a high reactivity (50-98%) 1,2 vinyl content, homopolymer or copolymer of 1,3 butadiene

Claim 13

Monofunctional monomer--a monomeric liquid or solid, containing one reactive group per molecule, this reactive group being capable of undergoing a vinyl type addition reaction 3. Multifunctional monomer--a monomeric liquid or solid containing two or more reactive groups, these groups being capable of undergoing a vinyl type addition 4. Resin type B--a low reactivity (2-49%) 1,2 vinyl content, homopolymer or copolymer of 1,3 butadiene 5. Initiator--a source of free radicals, capable of producing these free radicals at an appreciable rate (half-life ≦10 hours) at a temperature between 100° C. and 180° C. 6. Additive--any material capable of producing a desired change in properties, especially flow properties, surface tension or adhesion to a given substrate.

Claim 14

Monofunctional monomer--a monomeric liquid or solid, containing one reactive group per molecule, this reactive group being capable of undergoing a vinyl type addition reaction 3. Multifunctional monomer--a monomeric liquid or solid containing two or more reactive groups, these groups being capable of undergoing a vinyl type addition 4. Resin type B--a low reactivity (2-49%) 1,2 vinyl content, homopolymer or copolymer of 1,3 butadiene 5. Initiator--a source of free radicals, capable of producing these free radicals at an appreciable rate (half-life ≦10 hours) at a temperature between 100° C. and 180° C. 6. Additive--any material capable of producing a desired change in properties, especially flow properties, surface tension or adhesion to a given substrate.

Claim 15

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer, the insulating layer having the following composition: ______________________________________ Material Parts by Weight ______________________________________ 1. Resin type B 30-80 2. Monofunctional vinyl monomer 0-70 3. Multifunctional monomer 0-30 4. Initiator 0-10 5. Additive 0-5 ______________________________________ wherein the materials are defined as follows: 1. Resin type B--a low reactivity (2-49%) 1,2 vinyl content, homopolymer or copolymer of 1,3 butadiene 2. Monofunctional vinyl monomer--a monomeric liquid or solid, containing one reactive group per molecule, this reactive group being capable of undergoing a vinyl type addition reaction 3. Multifunctional monomer--a monomeric liquid or solid containing two or more reactive groups, these groups being capable of undergoing a vinyl type addition 4. Initiator--a source of free radicals, capable of producing these free radicals at an appreciable rate (half-life ≦10 hours) at a temperature between 100° C. and 180° C. 5. Additive--any material capable of producing a desired change in properties, especially flow properties, surface tension or adhesion to a given substrate.

Claim 16

In an oil-filled submergible electric pump motor, a stator structure with stator windings covered by a hydrolytically stable insulating layer, the insulating layer having the following composition: ______________________________________ Material Parts by Weight ______________________________________ 1. Resin type B 30-80 2. Monofunctional vinyl monomer 0-70 3. Multifunctional monomer 0-30 4. Initiator 0-10 5. Additive 0-5 ______________________________________ wherein the materials are defined as follows: 1. Resin type B--a low reactivity (2-49%) 1,2 vinyl content, homopolymer or copolymer of 1,3 butadiene 2. Monofunctional vinyl monomer--a monomeric liquid or solid, containing one reactive group per molecule, this reactive group being capable of undergoing a vinyl type addition reaction 3. Multifunctional monomer--a monomeric liquid or solid containing two or more reactive groups, these groups being capable of undergoing a vinyl type addition 4. Initiator--a source of free radicals, capable of producing these free radicals at an appreciable rate (half-life ≦10 hours) at a temperature between 100° C. and 180° C. 5. Additive--any material capable of producing a desired change in properties, especially flow properties, surface tension or adhesion to a given substrate.