# US 12,603,543 B2 · Wiring ring, stator and electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,543 B2 - Document ID: US12603543B2 - Status: Granted - Kind: B2 - Application number: 18/277,812 - Filed: 2022-02-03 - Published: 2024-04-18 - Granted: 2026-04-14 - Earliest claimed: 2021-02-25 - Assignees: Schaeffler Technologies AG & Co. KG - Applicants: Schaeffler Technologies AG & Co. KG - Inventors: Andreas Ruppert; Attila Hajba - Web page: https://patentgrep.com/patent/US12603543B2 ## CPC - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 3/50: Fastening of winding heads, equalising connectors, or connections thereto - H02K 3/52: Fastening salient pole windings or connections thereto - H02K 3/522: {for generally annular cores with salient poles} - H02K 2203/09: Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A wiring ring for a stator of an electric machine, including a housing having a plurality of slot-like recesses and a plurality of in particular annular or annular segment-like busbars which are arranged in the slot-like recesses. The busbars are designed to establish an electrical contact between the winding wire ends of the stator windings and the contact connections of a power electronics unit for controlling the electric machine. At least one of the bus bars contact to the contact connections of the power electronics unit is implemented via a busbar connection region by means of a screw connection. According to the disclosure, the screw connection has a nut which can be arranged loosely in a receptacle space of a receptacle underneath a through-hole in the busbar connection region. ## Claims ### Claim 1 An interconnection ring for a stator of an electric machine, comprising: a housing having a plurality of groove-like recesses; and a plurality of busbars in the shape of a circular ring or circular ring segment arranged in the groove-like recesses, wherein the busbars establish an electrical contact between winding wire ends of stator windings of the stator and contact connections of a power electronics unit for controlling the electric machine, wherein, in at least one of the busbars, the electrical contact to the contact connections of the power electronics unit includes a screw connection, wherein the screw connection includes a screw nut arranged loosely in a receiving space of a receptacle underneath a through-opening of the busbar connection region, and wherein the screw nut is movable in the receiving space along an x-axis, a y-axis and a z-axis. ### Claim 2 (depends on 1) The interconnection ring according to claim 1, wherein the receptacle is formed of insulating material including a plastic or plastic composite material. ### Claim 3 (depends on 1) The interconnection ring according to claim 1, wherein the receiving space of the receptacle is pot-shaped and includes a closed bottom, whereby a screw element screwed into the screw nut is electrically insulated on a bottom side in the receiving space of the receptacle. ### Claim 4 (depends on 1) The interconnection ring according to claim 1, wherein the receiving space of the receptacle has a geometric contour corresponding to the screw nut, whereby the screw nut is secured against rotation within the receiving space. ### Claim 5 (depends on 1) The interconnection ring according to claim 1, wherein the receptacle is a separate component fastened to the busbar in a force-fitting and/or form-fitting manner. ### Claim 6 (depends on 5) The interconnection ring according to claim 5, wherein the receptacle has a fastening arm with a latch for releasably fastening the receptacle to the busbar. ### Claim 7 (depends on 1) The interconnection ring according to any claim 1, wherein the receptacle is a separate component fastened to the housing of the interconnection ring in a force-fitting and/or form-fitting manner. ### Claim 8 (depends on 7) The interconnection ring according to claim 7, wherein the receptacle has at least two adjacently arranged receiving spaces each for receiving one screw nut, wherein each receiving space is assigned to a busbar of a different phase (u, v, w). ### Claim 9 A stator for an electric machine comprising: a stator body having a plurality of stator teeth, a plurality of stator windings which are arranged in stator grooves formed between the stator teeth, and an interconnection ring arranged on an axial end face of the stator, wherein the interconnection ring includes: a housing having a plurality of groove-like recesses; and a plurality of busbars in the shape of a circular ring or circular ring segment arranged in the groove-like recesses, wherein the busbars establish an electrical contact between winding wire ends of the plurality of stator windings and contact connections of a power electronics unit for controlling the electric machine, wherein, in at least one of the busbars, the electrical contact to the contact connections of the power electronics unit includes a screw connection, and wherein the screw connection includes a screw nut arranged loosely in a receiving space of a receptacle underneath a through-opening of the busbar connection region, and wherein the screw nut is movable in the receiving space along an x-axis, a y-axis and a z-axis. ### Claim 10 An electric machine comprising a stator, the stator including: a stator body having a plurality of stator teeth, a plurality of stator windings which are arranged in stator grooves formed between the stator teeth, and an interconnection ring arranged on an axial end face of the stator, wherein the interconnection ring includes a housing having a plurality of groove-like recesses; and a plurality of busbars in the shape of a circular ring or circular ring segment arranged in the groove-like recesses, wherein the busbars establish an electrical contact between winding wire ends of the plurality of stator windings and contact connections of a power electronics unit for controlling the electric machine, wherein, in at least one of the busbars, the electrical contact to the contact connections of the power electronics unit includes a screw connection, wherein the screw connection includes a screw nut arranged loosely in a receiving space of a receptacle underneath a through-opening of the busbar connection region, and wherein the screw nut is movable in the receiving space along an x-axis, a y-axis and a z-axis. ### Claim 11 (depends on 10) The electric machine according to claim 10, wherein the receptacle is formed of insulating material including a plastic or plastic composite material. ### Claim 12 (depends on 10) The electric machine according to claim 10, wherein the receiving space of the receptacle is pot-shaped and includes a closed bottom, whereby a screw element screwed into the screw nut is electrically insulated on a bottom side in the receiving space of the receptacle. ### Claim 13 (depends on 10) The electric machine according to claim 10, wherein the receiving space of the receptacle has a geometric contour of corresponding to the screw nut, whereby the screw nut is secured against rotation within the receiving space. ### Claim 14 (depends on 10) The electric machine according to claim 10, wherein the receptacle is a separate component fastened to the busbar in a force-fitting and/or form-fitting manner. ### Claim 15 (depends on 14) The electric machine according to claim 14, wherein the receptacle has a fastening arm with a latch for releasably fastening the receptacle to the busbar. ### Claim 16 (depends on 10) The electric machine according to claim 10, wherein the receptacle is a separate component fastened to the housing of the interconnection ring in a force-fitting and/or form-fitting manner. ### Claim 17 (depends on 16) The electric machine according to claim 16, wherein the receptacle has at least two adjacently arranged receiving spaces for receiving one screw nut in each case, wherein each receiving space is assigned to a busbar of a different phase (u, v, w).