# US 11,909,288 B2 · Stator of an electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,288 B2 - Document ID: US11909288B2 - Status: Granted - Kind: B2 - Application number: 17/607,148 - Filed: 2020-04-02 - Published: 2022-06-09 - Granted: 2024-02-20 - Earliest claimed: 2019-04-29 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Matthias Roepke; Jens Sauermann; Juergen Kujath - Web page: https://patentgrep.com/patent/US11909288B2 ## CPC - H02K 3/522: {for generally annular cores with salient poles} - H02K 3/02: Windings characterised by the conductor material - H02K 3/325: {for windings on salient poles, such as claw-shaped poles} - H02K 2203/06: Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations - 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 stator of an electric machine is already known, comprising stator teeth and grooves formed between the stator teeth, in which electrical conductor elements of an electrical individual coil winding are provided as individual coils, wherein an interconnection is provided on at least one end side of the stator, which has a ring section and multiple, in particular a number corresponding to the number of stator teeth, tooth sections protruding from the ring section in the radial direction. The interconnection ring comprises multiple bus bars for interconnecting the electrical individual coils of the electrical winding. The individual coils are produced from a conventional conductor material, e.g. copper. In the stator according to the invention, an electrical winding made of CNT conductor elements is provided. According to the invention: the conductor elements (4) of the electrical winding are configured as insertable conductor elements (4) of the electrical winding designed as a plug-in winding; the conductor elements (4) are each formed of a combination of carbon nanotubes and/or graphene fibres; and at least one electrically non-conductive conductor joining device (12) is provided on at least one of the tooth sections (10) of the interconnection ring (5), to which two respective conductor ends of two different conductor elements (4) are electrically connected by means of an electrically conductive joining means. ## Claims ### Claim 1 A stator of an electric machine that has stator teeth (2) and embodied between the stator teeth (2) are grooves (3) in which are provided in each case electrical conductor elements (4) of an electrical coil winding, wherein an interconnecting ring (5, 5.1, 5.2) is provided on at least one end face (1.1, 1.2) of the stator (1), said interconnecting ring comprising an annular section (8) and multiple toothed sections (10) that protrude from the annular section (8) in the radial direction with respect to a stator axis (9), wherein the conductor elements (4) of the electrical winding are embodied as pluggable conductor elements (4) of the electrical winding that is embodied as a plug-in winding, that the conductor elements (4) are formed in each case from a composite of carbon nanotubes and/or graphene fibers, that at least one electrically non-conductive conductor joining device (12) is provided on at least one of the toothed sections (10) of the interconnecting ring (5) and in each case two conductor ends of two different conductor elements (4) are electrically connected to said conductor joining device by an electrically conductive joining agent. ### Claim 2 (depends on 1) The stator as claimed in claim 1, wherein the conductor joining device (12) comprises in each case a depression (14). ### Claim 3 (depends on 1) The stator as claimed in claim 1, wherein the conductor joining devices (12) are part of an electrically non-conductive insulating body (16) of the interconnecting ring (5). ### Claim 4 (depends on 1) The stator as claimed in claim 1, wherein the pluggable conductor elements (4) of the plug-in winding are connected by way of the conductor joining devices (12) of the interconnecting rings (5) to individual toothed coils (7) that in each case extend with multiple windings about one of the stator teeth (2). ### Claim 5 (depends on 3) The stator as claimed in claim 3, wherein the interconnecting ring (5) is provided at both end faces (1.1,1.2) of the stator (1), wherein multiple current rails (18) are arranged in the insulating body (16) of the one interconnecting ring (5.1) so as to electrically interconnect the conductor elements (4) and wherein the insulating body (16) of the other interconnecting ring (5.2) is embodied in a current rail-free manner. ### Claim 6 (depends on 5) The stator as claimed in claim 5, wherein the individual toothed coils (7) are connected in each case by a coil end to one of the current rails (18) of the one interconnecting ring (5.1) and in each case by the other coil end to another of the current rails (18) of the same interconnecting ring (5.1). ### Claim 7 (depends on 5) The stator as claimed in claim 5, wherein the current rails (18) of the one interconnecting rail (5.1) have in each case electrical connectors (20) so as to connect the conductor elements (4), wherein the electrical connectors (20) each have a depression (21) or are provided in a depression (21) of the insulating body (16) of the interconnecting ring (5.1), wherein the depression (21) is embodied so as to receive an electrically conductive joining agent and at least one conductor end of one of the conductor elements (4). ### Claim 8 (depends on 5) The stator as claimed in claim 5, wherein one or more of the current rails (18) of the one interconnecting ring (5.1) has/have cantilever sections (22) that each reach into one of the toothed sections (10) of the insulating body (16) of the interconnecting ring (5.1). ### Claim 9 (depends on 7) The stator as claimed in claim 7, wherein the electrical connectors (20) of the current rails (18) are accessible by way of an opening in the insulating body (16) of the interconnecting ring (5.1) or protrude out of the insulating body (16). ### Claim 10 (depends on 1) The stator as claimed in claim 1, wherein the joining agent is an electrically conductive adhesive, a soldering agent or a welding filler material. ### Claim 11 (depends on 2) The stator as claimed in claim 2, wherein the conductor joining devices (12) are provided in each case with two insertion slits (15) by way of which the conductor ends can be placed in the depression (14). ### Claim 12 (depends on 6) The stator as claimed in claim 6, wherein the current rails (18) of the one interconnecting rail (5.1) have in each case electrical connectors (20) so as to connect the conductor elements (4), wherein the electrical connectors (20) each have a depression (21) or are provided in a depression (21) of the insulating body (16) of the interconnecting ring (5.1), wherein the depression (21) is embodied so as to receive an electrically conductive joining agent and at least one conductor end of one of the conductor elements (4). ### Claim 13 (depends on 6) The stator as claimed in claim 6, wherein one or more of the current rails (18) of the one interconnecting ring (5.1) has/have cantilever sections (22) that each reach into one of the toothed sections (10) of the insulating body (16) of the interconnecting ring (5.1). ### Claim 14 (depends on 7) The stator as claimed in claim 7, wherein one or more of the current rails (18) of the one interconnecting ring (5.1) has/have cantilever sections (22) that each reach into one of the toothed sections (10) of the insulating body (16) of the interconnecting ring (5.1).