# US 2019/0356181 A1 · Stator For An Electric Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356181 A1 - Document ID: US20190356181A1 - Status: Published application - Kind: A1 - Application number: 16/531,184 - Filed: 2019-08-05 - Published: 2019-11-21 - Earliest claimed: 2017-02-06 - Assignees: ebm-papst Mulfingen GmbH & Co. KG - Applicants: ebm-papst Mulfingen GmbH & Co. KG - Inventors: Michael STURM; Werner MUELLER; Thomas EHRLER - Web page: https://patentgrep.com/patent/US20190356181A1 ## CPC - H02K 1/223: {Rotor cores with windings and permanent magnets (for additional excitation in synchronous motors or generators H02K21/042; in synchronous motors having additional short-circuited winding for starting as an asynchronous motor H02K21/46)} - H02K 15/10: Applying solid insulation to windings, stators or rotors, e.g. applying insulating tapes - H02K 15/12: Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines - H02K 16/00: Machines with more than one rotor or stator {(machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029)} - H02K 16/04: Machines with one rotor and two stators - H02K 3/34: between conductors or between conductor and core, e.g. slot insulation - H02K 3/345: {between conductor and core, e.g. slot insulation} - H02K 2201/06: Magnetic cores, or permanent magnets characterised by their skew - H02K 2213/12: Machines characterised by the modularity of some components - 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 (1) for an electric motor has a modular stator body (2) with at least two stator cores (10, 20) arranged axially in series. Each core (10, 20) is form from a plurality of stacked electrical laminations (11, 21). This forms winding poles (16, 26) with radially extending winding webs (17, 27). The stator cores (10, 20) each have a separate overmolding (U1, U2). ## Claims ### Claim 1 A stator for an electric motor comprising: a modular stator body including at least two stator cores arranged axially in series, each stator core is formed from a plurality of stacked electrical laminations that form winding poles with radially extending winding webs; the stator cores each have a separate overmolding, the respective overmolding is applied to the inner surface of the respective stator core in the winding region, to the winding webs and to the pole slots (N) between the winding poles. ### Claim 2 (depends on 1) The stator according to claim 1, wherein connectors are provided on the two end-face electrical laminations of mutually adjacent stator cores, the connectors mechanical connect between the stator cores. ### Claim 3 (depends on 2) The stator according to claim 2, wherein on one stator core, the connectors are configured as a protruding catch that extend into opposing catches that are in the form of corresponding openings suitably formed on the second stator core to produce a clamping connection. ### Claim 4 (depends on 1) The stator according to claim 1, wherein plastic lands protrude peripherally along the winding poles from the end face of one stator core, the plastic lands extend into the respective corresponding intermediate spaces of the winding poles of the adjacent stator core. ### Claim 5 (depends on 4) The stator according to claim 4, wherein several immediately adjacent electrical laminations of the adjacent stator core, arranged at its end, have no overmolding on the inner surface in the winding region, on the winding webs, and have no overmolding on the pole slots between the winding poles. ### Claim 6 (depends on 1) The stator according to claim 1, wherein two or all of the stator cores arranged axially in series have the same or approximately the same overall axial length. ### Claim 7 (depends on 1) The stator according to claim 1, wherein the slots of the stator cores are skewed or straight. ### Claim 8 (depends on 7) The stator according to claim 7, wherein the slot ends of the slots of one stator core are aligned with the slot beginnings of the corresponding slots of the adjoining stator core, so that continuous, skewed pole slots extend along the stator body. ### Claim 9 (depends on 1) The stator according to claim 1, wherein the respective end faces of the end laminations of the two stator cores are likewise overmolded, preferably in a thickness of approximately 0.3 mm to approximately 0.6 mm. ### Claim 10 A method for producing a stator comprising the steps of: providing a first stator core formed from a plurality of stacked electrical laminations; overmolding plastic onto the first stator core; providing at least one additional stator core formed from a plurality of stacked electrical laminations; overmolding plastic onto the at least one additional stator core; aligning the stator cores axially with one another; connecting the first and at least the second stator core mechanically at end-face connectors; and forming a stator body. ### Claim 11 (depends on 10) The method according to claim 10, wherein the connecting step is accomplished without tools, via a mating process or joining process.