# US 11,309,759 B2 · Conductor bar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,759 B2 - Document ID: US11309759B2 - Status: Granted - Kind: B2 - Application number: 17/016,474 - Filed: 2020-09-10 - Published: 2021-03-18 - Granted: 2022-04-19 - Earliest claimed: 2019-09-12 - Assignees: GE Renewable Technologies - Applicants: GE Renewable Technologies - Inventors: Alexander Anderton; Markus Huwyler; Andreas Köpfler; Armin Fubel - Web page: https://patentgrep.com/patent/US11309759B2 ## CPC - H02K 3/04: Windings characterised by the conductor shape, form or construction, e.g. with bar conductors - H02K 3/32: Windings characterised by the shape, form or construction of the insulation - H02K 3/34: between conductors or between conductor and core, e.g. slot insulation - H02K 3/40: for high voltage, e.g. affording protection against corona discharges - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A conductor bar for a stator winding of a rotating electrical machine includes a bundle of parallel conductor strands extending between two ends of the conductor bar and spaced apart by interspaces. A main insulation is wound around the bundle of conductor strands and a stack separators fills at least part of the interspaces. Protection elements are between the bundle of conductor strands and the main insulation. At least one of the protection elements or the stack separators are configured to compensate, at least in part, thermal expansion of the conductor elements when temperature changes. ## Claims ### Claim 1 A conductor bar for a stator winding of a rotating electrical machine, comprising a bundle of parallel conductor strands extending between two ends of the conductor bar and spaced apart by interspaces; a main insulation wound around the bundle of conductor strands; a stack separator filling, at least in part, the interspaces; protection elements intercalated in between the bundle of conductor strands and the main insulation wound around the bundle of conductor strands; and the stack separator formed from a flexible or elastic material configured to compensate, at least in part, thermal expansion of the conductor strands when temperature changes. ### Claim 2 (depends on 1) The conductor bar according to claim 1, wherein the stack separator has a Young modulus lower than 100 MPa so that it compensates, at least in part, the thermal expansion of the conductor elements when heated. ### Claim 3 (depends on 1) The conductor bar according to claim 1, wherein the protection elements comprise an elastic or flexible material. ### Claim 4 (depends on 1) The conductor bar according to claim 1, wherein the stack separator comprises a woven fabric laminated or impregnated with an elastic or flexible material. ### Claim 5 (depends on 1) The conductor bar according to claim 1, wherein the conductor strands are stacked in at least two adjacent columns, the stack of columns having lateral sides parallel to a stacking direction and narrow sides transverse to the stacking direction. ### Claim 6 (depends on 5) The conductor bar according to claim 5, wherein at least one of the protection elements is disposed on each of the narrow sides. ### Claim 7 (depends on 5) The conductor bar according to claim 5, wherein the interspaces comprise a central interspace between the adjacent columns. ### Claim 8 (depends on 5) The conductor bar according to claim 5, wherein the main insulation is in direct physical contact with the conductor strands at the two lateral sides. ### Claim 9 (depends on 1) The conductor bar according to claim 1, wherein the conductor strands comprise copper. ### Claim 10 (depends on 1) Windings of a stator for a rotating electrical machine, the windings comprising conductor bars according to claim 1. ### Claim 11 (depends on 10) A stator of a rotating electrical machine comprising the windings according to claim 10. ### Claim 12 (depends on 11) A rotating electrical machine comprising the stator according to claim 11. ### Claim 13 (depends on 1) The conductor bar according to claim 1, wherein the conductor strands comprise copper. ### Claim 14 A conductor bar for a stator winding of a rotating electrical machine, comprising a bundle of parallel conductor strands extending between two ends of the conductor bar and spaced apart by interspaces; a main insulation wound around the bundle of conductor strands; a stack separator filling, at least in part, the interspaces; protection elements intercalated in between the bundle of conductor strand and the main insulation wound around said bundle; and wherein the stack separator comprises a weakness area in its volume or at an interface between the stack separator and the conductor strands, the weakness area configured to break when submitted to a mechanical stress higher than a predetermined magnitude so that the stack separator compensates, at least in part, the thermal expansion of the conductor elements. ### Claim 15 (depends on 14) The conductor bar according to claim 14, wherein the stack separator comprises a stack of two bonded layers, an interface between the two bonded layers being the weakness area so that the two bonded layers debond when submitted to the mechanical stress. ### Claim 16 (depends on 14) The conductor bar according to claim 14; wherein the stack separator comprises a thermoplastic glue that softens when heated. ### Claim 17 A conductor bar for a stator winding of a rotating electrical machine, comprising a bundle of parallel conductor strands extending between two ends of the conductor bar and spaced apart by interspaces; a main insulation wound around the bundle of conductor strands; a stack separator filling, at least in part, the interspaces; protection elements completely filling a space between the bundle of conductor strands and the main insulation; and the protection elements formed from a flexible or elastic material configured to compensate thermal expansion of the conductor strands when temperature changes. ### Claim 18 (depends on 17) The conductor bar according to claim 17, wherein the protection elements have a Young modulus lower than 100 MPa so that it compensates, at least in part, the thermal expansion of the conductor elements when heated. ### Claim 19 (depends on 17) The conductor bar according to claim 17, wherein the protection elements comprise a woven fabric laminated or impregnated with an elastic or flexible material. ### Claim 20 (depends on 17) The conductor Tar according to claim 17, wherein the conductor strands are stacked in at least two adjacent columns, the stack of columns having lateral sides parallel to a stacking direction and narrow sides transverse to the stacking direction, and wherein at least one of the protection elements is disposed on each of the narrow sides. ### Claim 21 (depends on 20) The conductor bar according to claim 20, wherein the interspaces comprise a central interspace between the adjacent columns. ### Claim 22 (depends on 20) The conductor bar according to claim 20, wherein the main insulation is in direct physical contact with the conductor strands at the two lateral sides. ### Claim 23 (depends on 17) Windings of a stator for a rotating electrical machine, the windings comprising conductor bars according to claim 17. ### Claim 24 (depends on 23) A stator of a rotating electrical machine comprising the windings according to claim 23. ### Claim 25 (depends on 24) A rotating electrical machine comprising the stator according to claim 24.