# US 2023/0412031 A1 · Electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0412031 A1 - Document ID: US20230412031A1 - Status: Published application - Kind: A1 - Application number: 18/240,064 - Filed: 2023-08-30 - Published: 2023-12-21 - Earliest claimed: 2020-10-29 - Assignees: BorgWarner Inc. - Applicants: BorgWarner Inc. - Inventors: Christopher Joel Maurus; Jeffrey Carter; Tyler Ransom Garrard - Web page: https://patentgrep.com/patent/US20230412031A1 ## CPC - F02B 37/10: at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump} - H02K 3/522: {for generally annular cores with salient poles} - F02B 39/10: electric - F02C 6/12: Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure - F04D 17/10: for compressing or evacuating - F04D 17/12: Multi-stage pumps - F04D 25/024: {the driving means being assisted by a power recovery turbine} - F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence) - F04D 25/0606: {the electric motor being specially adapted for integration in the pump} - F04D 29/043: Shafts - F04D 29/063: specially adapted for elastic fluid pumps - H02K 1/146: {consisting of a generally annular yoke with salient poles} - H02K 1/20: with channels or ducts for flow of cooling medium - H02K 3/24: with channels or ducts for cooling medium between the conductors - H02K 7/1823: {structurally associated with turbines or similar engines} - H02K 15/22: Shaping or compacting conductors in slots or around salient poles (H02K15/28 takes precedence) - F05D 2220/40: in turbochargers - H02K 2203/12: Machines characterised by the bobbins for supporting the windings - Y02T 10/12: Improving ICE efficiencies - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An electric machine includes a rotor extending along an axis and a stator lamination stack radially spaced from the rotor. The stator lamination stack has circumferentially spaced teeth defining gaps therebetween. The electric machine also includes a coil winding disposed in the gaps between the circumferentially spaced teeth and a guard plate disposed at one of the first and second stator ends. The guard plate extends radially away from the axis and includes a plurality of teeth guards extending radially, with each of the teeth guards aligned with one of the teeth of the stator lamination stack to electrically insulate the coil winding from the teeth of the stator lamination stack. The plurality of teeth of the stator lamination stack extend radially inward toward the axis and the teeth guards of the guard plate extend radially inward toward the axis. ## Claims ### Claim 1 An electric machine comprising; a rotor extending along an axis; a stator lamination stack radially spaced from said rotor, with said stator lamination stack having, a first stator end; a second stator end spaced from said first stator end; and a plurality of circumferentially spaced teeth extending between said first and second stator ends radially with respect to said axis, said plurality of circumferentially spaced teeth defining gaps therebetween; a coil winding disposed in said gaps between said circumferentially spaced teeth of said stator lamination stack; and a guard plate disposed at one of said first and second stator ends of said stator lamination stack, said guard plate extending radially away from said axis and comprising a plurality of teeth guards extending radially with respect to said axis, wherein each of said plurality of teeth guards is aligned with one of said plurality of teeth of said stator lamination stack to electrically insulate said coil winding from said plurality of teeth of said stator lamination stack; and wherein said plurality of teeth of said stator lamination stack extend radially inward toward said axis and said teeth guards of said guard plate extend radially inward toward said axis. ### Claim 2 (depends on 1) The electric machine as set forth in claim 1, wherein each of said plurality of teeth guards is U-shaped. ### Claim 3 (depends on 2) The electric machine as set forth in claim 2, wherein each of said plurality of teeth guards defines a lubrication channel, and wherein each of said plurality of teeth of said stator lamination stack is aligned with one of said lubrication channels of said plurality of teeth guards. ### Claim 4 (depends on 1) The electric machine as set forth in claim 1, wherein said guard plate presents a flat surface facing away from said first and second stator ends and extending along a plane, with said coil winding contacting said flat surface of said guard plate. ### Claim 5 (depends on 1) The electric machine as set forth in claim 1, wherein said guard plate presents a curved surface facing away from said first and second stator ends and defining a concave recess, and wherein said coil winding is disposed at least partially in said concave recess defined by said curved surface to electrically insulate said coil winding from said one of said first and second stator ends of said stator lamination stack. ### Claim 6 (depends on 5) The electric machine as set forth in claim 5, wherein said guard plate has an outermost plate surface facing away from said axis that extends axially away from said first and second stator ends to a first axial point, and wherein said curved surface extends from said first axial point toward said first and second stator ends to a second axial point disposed axially between said first axial point and said stator end at which said guard plate is disposed. ### Claim 7 (depends on 6) The electric machine as set forth in claim 6, wherein said curved surface extends axially from said first axial point and curves to extend radially to said second axial point. ### Claim 8 (depends on 1) The electric machine as set forth in claim 1, wherein said stator lamination stack has an outermost stator surface facing away from said axis, wherein said guard plate has an outermost plate surface facing away from said axis, and wherein said outermost stator surface and said outermost plate surface are radially aligned with one another. ### Claim 9 (depends on 5) The electric machine as set forth in claim 5, wherein said guard plate comprises at least one seating peg extending away from said curved surface axially toward said stator end opposite said stator end at which said guard plate is disposed. ### Claim 10 (depends on 9) The electric machine as set forth in claim 9, wherein said stator lamination stack defines at least one seating groove, and wherein said at least one seating peg is disposed at least partially in said at least one seating groove to position said guard plate relative to said stator lamination stack. ### Claim 11 (depends on 10) The electric machine as set forth in claim 10, wherein said stator lamination stack has an outermost stator surface facing away from said axis, and wherein said outermost stator surface of said stator lamination stack at least partially defines said at least one seating groove. ### Claim 12 (depends on 1) The electric machine as set forth in claim 1, wherein said guard plate is further defined as a first guard plate and said plurality of teeth guards are further defined as a first plurality of teeth guards, and wherein said electric machine comprises a second guard plate disposed at the other of said first and second stator ends of said stator lamination stack, with said second guard plate extending radially away from said axis and comprising a second plurality of teeth guards extending radially with respect to said axis, wherein each of said second plurality of teeth guards is aligned with one of said plurality of teeth of said stator lamination stack to electrically insulate said coil winding from said stator lamination stack. ### Claim 13 (depends on 12) The electric machine as set forth in claim 12, wherein at least a portion of said first teeth guards of said first guard plate and at least a portion of said second teeth guards of said second guard plate are in contact with one another. ### Claim 14 (depends on 13) The electric machine as set forth in claim 13, wherein at least a portion of said first teeth guards and at least a portion of said second teeth guards are engageable together to electrically insulate said coil winding from said stator lamination stack. ### Claim 15 (depends on 14) The electric machine as set forth in claim 14, wherein at least a portion of said first teeth guards and at least a portion of said second teeth guards axially overlap one another. ### Claim 16 (depends on 15) The electric machine as set forth in claim 15, wherein said first teeth guards circumferentially alternate between a male configuration and a female configuration, wherein said second teeth guards circumferentially alternate between a female configuration and a male configuration, and wherein said male and female configurations of said first and second teeth guards are engageable with one another. ### Claim 17 (depends on 12) The electric machine as set forth in claim 12, wherein said first guard plate presents a first curved surface defining a first concave recess, wherein said second guard plate presents a second curved surface facing away from said first and second stator ends and defining a second concave recess, and wherein said coil winding is disposed at least partially in said second concave recess defined by said second curved surface to electrically insulate said coil winding from said other of said first and second stator ends of said stator lamination stack. ### Claim 18 (depends on 1) The electric machine as set forth in claim 1 further defined as an electric motor. ### Claim 19 (depends on 1) The electric machine as set forth in claim 1 further defined as an electric generator. ### Claim 20 A method of manufacturing an electric machine, the electric machine including a rotor extending along an axis, a stator lamination stack radially spaced from the rotor, with the stator lamination stack having a first stator end and a second stator end spaced from the first stator end along the axis, and a plurality of circumferentially spaced teeth extending between the first and second stator ends, with the plurality of circumferentially spaced teeth extending radially with respect to the axis, and with the plurality of circumferentially spaced teeth defining gaps therebetween, a coil winding disposed in the gaps between the circumferentially spaced teeth of the stator lamination stack, and a guard plate disposed at one of the first and second stator ends of the stator lamination stack, the guard plate extending radially away from the axis and comprising a plurality of teeth guards extending radially with respect to the axis, each of the plurality of teeth guards being aligned with one of the plurality of teeth of the stator lamination stack, said method comprising the steps of: coupling the guard plate to one of the first and second stator ends of the stator lamination stack; inserting the coil winding in the gaps defined by the circumferentially spaced teeth of the stator lamination stack; and compacting the coil winding against the teeth guards of the guard plate to electrically insulate the coil winding from the plurality of teeth of the stator lamination stack.