# US 2018/0323674 A1 · Electric motor for use in pressurized fluid environment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323674 A1 - Document ID: US20180323674A1 - Status: Published application - Kind: A1 - Application number: 15/584,505 - Filed: 2017-05-02 - Published: 2018-11-08 - Earliest claimed: 2017-05-02 - Assignees: Moog Inc. - Applicants: Moog Inc. - Inventors: Matthew Allen CARROLL; Lee L. SNIDER; Mohammad KHANDAN-BARANI; Ronald G. FLANARY; Allen DUNCAN; Travis S. KING - Web page: https://patentgrep.com/patent/US20180323674A1 ## CPC - H02K 5/08: Insulating casings - H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers - H02K 5/128: using air-gap sleeves or air-gap discs - H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)} - H02K 15/02: of stator or rotor bodies - H01R 4/242: the contact members being plates having a single slot - H02K 5/06: Cast metal casings - H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS ## Abstract An electric motor built for exposure to high pressure fluid includes a unitary metal sleeve that provides a fluid barrier between the rotor and the stator. An overmolded resin encapsulates the stator windings and reinforces the sleeve to minimize deformation of the sleeve under high fluid pressures. The overmolded resin also fixes the positions of insulation displacement connectors connected to the stator windings, thereby avoiding mechanical brackets and fasteners for holding the insulation displacement connectors in position. ## Claims ### Claim 1 An electric motor comprising: a rotor having an axis of rotation; a stator surrounding the rotor, the stator including a plurality of windings; a unitary metal sleeve including a side portion between the rotor and the stator, wherein the sleeve provides a fluid barrier between the rotor and the stator; a plurality of insulation displacement connectors connected to corresponding windings of the stator; and a resin overmold encapsulating the stator and a portion of each insulation displacement connector, wherein the resin overmold engages the side portion of the sleeve, and wherein the resin overmold fixes the position of each insulation displacement connector relative to the stator. ### Claim 2 (depends on 1) The electric motor according to claim 1, wherein the unitary metal sleeve further includes a flange portion extending radially outward from the side portion, and the resin overmold further engages the flange portion of the sleeve. ### Claim 3 (depends on 1) The electric motor according to claim 1, further comprising a unitary metal housing including at least one sidewall defining a cylindrical cavity aligned along the axis of rotation of the rotor, wherein the rotor and the stator are received within the cylindrical cavity of the housing. ### Claim 4 (depends on 3) The electric motor according to claim 3, wherein the unitary metal housing further includes an end wall adjacent the at least one side wall, wherein the end wall has a plurality of portals extending through the end wall and communicating with the cylindrical cavity, and the plurality of insulation displacement connectors extend through the plurality of portals. ### Claim 5 (depends on 4) The electric motor according to claim 4, wherein the end wall of the housing includes a recess, and the unitary metal sleeve further includes a closed end portion projecting into the recess in the end wall of the housing. ### Claim 6 (depends on 5) The electric motor according to claim 5, wherein the end portion of the sleeve and the recess in the end wall of the housing correspond in shape and are in surface-to-surface engagement with one another. ### Claim 7 (depends on 6) The electric motor according to claim 6, wherein the end portion of the sleeve and the recess in the end wall of the housing are ellipsoidal in shape. ### Claim 8 (depends on 6) The electric motor according to claim 6, wherein the end portion of the sleeve and the recess in the end wall of the housing are frusto-conical in shape. ### Claim 9 (depends on 2) The electric motor according to claim 2, wherein the housing includes an internal annular ledge and the flange portion of the sleeve includes a circumferential stepped rim having an axially extending portion and a radially extending portion, wherein the radially extending portion of the stepped rim engages the annular ledge of the housing, and the electric motor further comprises a retainer ring arranged to retain the radially extending portion of the stepped rim against the annular ledge of the housing and an elastomeric O-ring arranged between the retainer ring and an outer diameter of the axially extending portion of the stepped rim. ### Claim 10 (depends on 2) The electric motor according to claim 2, wherein the housing includes an internal annular ledge and the flange portion of the sleeve is flat, wherein a peripheral region of the flange portion engages the annular ledge of the housing, and wherein the electric motor further comprises a retainer ring arranged to retain the peripheral region of the flange portion against the annular ledge of the housing and an elastomeric O-ring arranged between the retainer ring and the flange portion. ### Claim 11 (depends on 1) The electric motor according to claim 1, wherein the electric motor further comprises a retainer ring and an elastomeric O-ring, the retainer ring having an outer diameter facing an inner diameter of the unitary metal sleeve, the elastomeric O-ring being arranged between the outer diameter of the retainer ring and the inner diameter of the unitary metal sleeve. ### Claim 12 (depends on 1) The electric motor according to claim 1, wherein the side portion of the sleeve includes a radially reduced portion tapering in a direction away from the flange portion. ### Claim 13 (depends on 12) The electric motor according to claim 12, wherein the resin overmold engages the radially reduced portion of the side portion of the sleeve. ### Claim 14 (depends on 12) The electric motor according to claim 12, wherein the radially reduced portion has a frusto-conical shape. ### Claim 15 (depends on 1) The electric motor according to claim 1, wherein the housing is a die cast housing. ### Claim 16 (depends on 1) The electric motor according to claim 1, wherein the sleeve is drawn from a single piece of sheet material having a thickness in a range from 0.010 inches (0.0254 cm) through 0.020 inches (0.0508 cm).