# US 2014/0190002 A1 · Field coil winding assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190002 A1 - Document ID: US20140190002A1 - Status: Published application - Kind: A1 - Application number: 13/737,356 - Filed: 2013-01-09 - Published: 2014-07-10 - Earliest claimed: 2013-01-09 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: James Jun Xu; Stephen Frank Francese; Alan Michael Iversen; Leonard Paul Squillacioti - Web page: https://patentgrep.com/patent/US20140190002A1 ## CPC - H02K 15/10: Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes - H02K 3/30: Windings characterised by the insulating material - H02K 3/34: between conductors or between conductor and core, e.g. slot insulation - H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines - Y10T 29/49009: Dynamoelectric machine - Y10T 29/49012: Rotor - Y10T 29/49071: by winding or coiling - Y10T 29/49073: by assembling coil and core - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A method for preparing a field coil winding assembly including cleaning a plurality of copper coils followed by developing, after the cleaning, a copper oxide layer on each of the copper coils by oxidizing each of the copper coils in a solution. After the developing, each of the copper coils is rinsed followed by drying. After the drying, a turn insulation system is applied to each of the copper coils. The turn insulation system includes a turn insulation and an adhesive. The turn insulation includes at least one of a glass fiber re-enforced polyamideimide, a glass fiber re-enforced polyester, or a glass fiber re-enforced high temperature novolac epoxy. After the applying, each of the copper coils with the turn insulation system is cured. The plurality of copper coils with the turn insulation system are stacked in each of a plurality of rotor slots in a rotor. ## Claims ### Claim 1 A method of preparing a field coil winding assembly, comprising: cleaning a plurality of copper coils; developing, after the cleaning, a copper oxide layer on each of the copper coils by oxidizing each of the copper coils in a solution; rinsing, after the developing, each of the copper coils; drying, after the rinsing, each of the copper coils; applying, after the drying, a turn insulation system to each of the copper coils, wherein the turn insulation system includes a turn insulation and an adhesive, wherein the turn insulation includes at least one of a glass fiber re-enforced polyamideimide, a glass fiber re-enforced polyester, or a glass fiber re-enforced high temperature novolac epoxy; curing, after the applying, each of the copper coils with the turn insulation system; and stacking the plurality of copper coils with the turn insulation system in each of a plurality of rotor slots in a rotor. ### Claim 2 (depends on 1) The method of claim 1, wherein the cleaning is performed using an alkaline detergent. ### Claim 3 (depends on 1) The method of claim 1, wherein the solution contains one of sodium chlorite, sodium hydroxide, trisodium phosphate, and deionized water. ### Claim 4 (depends on 1) The method of claim 1, wherein a duration of the developing is a period of time of about 4 to about 45 minutes. ### Claim 5 (depends on 1) The method of claim 1, wherein a solution temperature of the solution is in a range of about 45° C. to about 70° C. ### Claim 6 (depends on 1) The method of claim 1, wherein a thickness of the copper oxide layer is in a range of about 150 nm to about 5 microns. ### Claim 7 (depends on 1) The method of claim 1, wherein the rinsing comprises rinsing with water followed by rinsing with deionized water. ### Claim 8 (depends on 7) The method of claim 7, wherein the water has a water temperature of about 25° C. to about 50° C. ### Claim 9 (depends on 1) The method of claim 1, wherein the adhesive has a temperature index of at least 130° C. ### Claim 10 (depends on 1) The method of claim 1, wherein the adhesive is at least one of a one part Bisphenol-A-based epoxy, a polyamideimide, a polyester, or a high temperature novolac epoxy. ### Claim 11 (depends on 10) The method of claim 10, wherein the curing is at a cure temperature of about 90° C. to about 120° C. for not less than about 4 hours for the one part Bisphenol-A-based epoxy, about 180° C. to about 210° C. for about 2-3 hours for the polyamideimide, about 150° C. to about 170° C. for not less than about 4 hours for the polyester, or about 150° C. to about 170° C. for not less than about 4 hours for the high temperature novolac epoxy. ### Claim 12 (depends on 1) The method of claim 1, wherein the turn insulation includes at least one of a glass fiber re-enforced novolac epoxy, a glass fiber re-enforced polyamideimide, a glass fiber re-enforced polyester, or a glass fiber re-enforced high temperature novolac epoxy. ### Claim 13 A method, comprising: cleaning a plurality of copper coils; developing, after the cleaning, a copper oxide layer on the copper coils by oxidizing the copper coils in a solution; rinsing, after the developing, the copper coils; drying, after the rinsing, the copper coils; applying, after the drying, a turn insulation system to the copper coils, wherein the turn insulation system includes a turn insulation and an adhesive; and curing, after the applying, the copper coils with the turn insulation system. ### Claim 14 (depends on 13) The method of claim 13, wherein the cleaning is performed using an alkaline detergent. ### Claim 15 (depends on 13) The method of claim 13, wherein the solution contains one of sodium chlorite, sodium hydroxide, trisodium phosphate, and deionized water. ### Claim 16 (depends on 13) The method of claim 13, wherein a duration of the developing is a period of time of about 4 to about 45 minutes. ### Claim 17 (depends on 13) The method of claim 13, wherein a solution temperature of the solution is a range of about 45° C. to about 70° C. ### Claim 18 (depends on 13) The method of claim 13, wherein a thickness of the copper oxide layer is in a range of about 150 nm to about 5 microns. ### Claim 19 (depends on 13) The method of claim 13, wherein the adhesive is at least one of a one part Bisphenol-A-based epoxy, a polyamideimide, a polyester, or a high temperature novolac epoxy. ### Claim 20 (depends on 13) The method of claim 13, wherein the turn insulation includes at least one of a glass fiber re-enforced novolac epoxy, a glass fiber re-enforced polyamideimide, a glass fiber re-enforced polyester, or a glass fiber re-enforced high temperature novolac epoxy.