# US 2014/0191623 A1 · Breathing electric motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191623 A1 - Document ID: US20140191623A1 - Status: Published application - Kind: A1 - Application number: 14/206,206 - Filed: 2014-03-12 - Published: 2014-07-10 - Earliest claimed: 2011-09-12 - Assignees: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Wuerzburg - Applicants: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Wuerzburg - Inventors: TOBIAS HILLENBRAND - Web page: https://patentgrep.com/patent/US20140191623A1 ## CPC - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 1/22: Rotating parts of the magnetic circuit - H02K 3/522: {for generally annular cores with salient poles} - H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers - H02K 9/00: Arrangements for cooling or ventilating (channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24) - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02K 1/2706: Inner rotors - H02K 1/32: with channels or ducts for flow of cooling medium - H02K 5/207: {with openings in the casing specially adapted for ambient air} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract An electric motor has efficient self-cooling. The electric motor contains a rotor that is rotatably mounted with respect to a stator. On a first sub-segment of an end face of the rotor, a first air-guiding contour is formed that, during rotation of the rotor in a reference rotation direction, generates an outwardly directed air flow. On a second sub-segment of the same end face, a second air-guide contour is formed that, during rotation of the rotor in a reference rotation direction, generates an inwardly directed air flow. ## Claims ### Claim 1 An electric motor, comprising: a stator; a rotor mounted such that said rotor can rotate in relation to said stator, said rotor having an end face with a first partial segment and a second partial segment; a first air-guiding contour generating an outwardly directed air stream when said rotor rotates in a reference rotation direction, and formed on said first partial segment of said end face of said rotor; a second air-guiding contour generating an inwardly directed air stream when said rotor rotates in the reference rotation direction, and formed on said second partial segment of said end face; and during rotation of said rotor, an overall air stream produced by said first and second air-guiding contours continuously changes its direction at each stationary point over a periphery of said end face as said first partial segment and said second partial segment alternately pass by. ### Claim 2 (depends on 1) The electric motor according to claim 1, wherein said first partial segment and said second partial segment are each formed by a half-segment of said end face. ### Claim 3 (depends on 1) The electric motor according to claim 1, wherein said first air-guiding contour is configured with mirror-image symmetry in relation to said second air-guiding contour. ### Claim 4 (depends on 1) The electric motor according to claim 1, wherein said first air-guiding contour and said second air-guiding contour each have a number of elongate webs which project from said end face in an axial direction and which in each case extend obliquely to a local radial of said end face. ### Claim 5 (depends on 4) The electric motor according to claim 4, wherein all of said elongate webs of said first air-guiding contour and/or all of said elongate webs of said second air-guiding contour are set to a same degree in relation to local radials. ### Claim 6 (depends on 4) The electric motor according to claim 4, wherein said rotor has radial webs projecting from said end face in an axial direction, said first partial segment and said second partial segment are separated by said radial webs. ### Claim 7 (depends on 6) The electric motor according to claim 6, wherein said rotor has further radial webs, said first partial segment and said second partial segment are separated into subsegments in each case by at least one of said further radial webs. ### Claim 8 (depends on 7) The electric motor according to claim 7, wherein in each case one of said elongate webs of either said first air-guiding contour and, respectively, of said second air-guiding contour is disposed in each of said subsegments of said first partial segment and of said second partial segment. ### Claim 9 (depends on 1) The electric motor according to claim 1, further comprising: a housing part of a motor housing, said housing part disposed opposite said end face of said rotor and having a mating face and ventilation openings formed therein, said mating face having a mating air-guiding contour having webs and slots formed therein disposed between said webs, said mating face adjoining said end face, and each of said slots opening out into one of said ventilation openings on a circumference of said mating surface. ### Claim 10 (depends on 9) The electric motor according to claim 9, further comprising an electronics compartment for accommodating a converter electronics system disposed in said housing part which adjoins said end face. ### Claim 11 (depends on 6) The electric motor according to claim 6, wherein said rotor has further radial webs, said first partial segment and said second partial segment are separated into subsegments in each case by three of said further radial webs.