# US 2008/0185923 A1 · Motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0185923 A1 - Document ID: US20080185923A1 - Status: Published application - Kind: A1 - Application number: 11/672,256 - Filed: 2007-02-07 - Published: 2008-08-07 - Earliest claimed: 2007-02-07 - Assignees: A.O. Smith Corporation - Inventors: Gary D. Noe - Web page: https://patentgrep.com/patent/US20080185923A1 ## CPC - H02K 9/197: in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator - H02K 5/08: Insulating casings - H02K 1/2706: Inner rotors - H02K 5/1732: {radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence)} - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A motor that is operable in response to an external power supply includes a stator core that is electrically connected to the external power supply and a rotor core positioned adjacent the stator core and rotatable about an axis in response to power being delivered to the stator core by the external power supply. A first encasement member is formed around the stator core to define a cavity and a second encasement member is formed around the rotor core and is sized such that at least a portion of the second encasement member and rotor core is disposed within the cavity. A quantity of coolant is disposed within the cavity. ## Claims ### Claim 1 A motor operable in response to an external power supply, the motor comprising: a stator core electrically connected to the external power supply; a rotor core positioned adjacent the stator core and rotatable about an axis in response to power being delivered to the stator core by the external power supply; a first encasement member formed around the stator core to define a cavity; a second encasement member formed around the rotor core and sized such that at least a portion of the second encasement member and rotor core is disposed within the cavity; and a quantity of coolant disposed within the cavity. ### Claim 2 (depends on 1) The motor of claim 1, further comprising a cap attached to the first encasement member such that the first encasement member and the cap cooperate to enclose the cavity. ### Claim 3 (depends on 1) The motor of claim 1, further comprising a bearing support portion integrally-formed as part of the first encasement layer. ### Claim 4 (depends on 3) The motor of claim 3, further comprising a bearing at least partially supported by the bearing support, the bearing positioned to at least partially support the rotor core for rotation. ### Claim 5 (depends on 4) The motor of claim 4, wherein the bearing is substantially non-metallic. ### Claim 6 (depends on 1) The motor of claim 1, wherein the coolant is water. ### Claim 7 (depends on 1) The motor of claim 1, wherein at least one of the first encasement member and the second encasement member is a polymer. ### Claim 8 (depends on 7) The motor of claim 7, wherein the first encasement member and the second encasement member are injection molded around the stator core and the rotor core respectively. ### Claim 9 (depends on 1) The motor of claim 1, wherein the stator core is completely encased within the first encasement member and the rotor core is completely encased within the second encasement member. ### Claim 10 A motor comprising: a stator core defining a cavity having a first open end and a second open end; a rotor core positioned at least partially within the stator core; a quantity of coolant, at least a portion of which is positioned between the rotor core and the stator core; a first encasement member coupled to the stator core to inhibit direct contact between the stator core and the coolant, the first encasement member covering the first open end; and a second encasement member coupled to the rotor core to inhibit direct contact between the rotor core and the coolant. ### Claim 11 (depends on 10) The motor of claim 10, further comprising a bearing support portion integrally-formed as part of the first encasement member. ### Claim 12 (depends on 11) The motor of claim 11, further comprising a bearing at least partially supported by the bearing support, the bearing positioned to at least partially support the rotor core for rotation. ### Claim 13 (depends on 12) The motor of claim 12, wherein the bearing is substantially non-metallic. ### Claim 14 (depends on 10) The motor of claim 10, wherein the coolant is water. ### Claim 15 (depends on 10) The motor of claim 10, wherein at least one of the first encasement member and the second encasement member is a polymer. ### Claim 16 (depends on 15) The motor of claim 15, wherein the first encasement member and the second encasement member are injection molded around the stator core and the rotor core respectively. ### Claim 17 (depends on 10) The motor of claim 10, wherein the stator core is completely encased within the first encasement member and the rotor core is completely encased within the second encasement member. ### Claim 18 (depends on 10) The motor of claim 10, further comprising a cap coupled to the first encasement such that the cap substantially covers the second open end. ### Claim 19 A motor operable in response to a flow of external power from an external power supply, the motor comprising: a stator core including a winding that is electrically connected to the external power supply; a rotor core positioned adjacent the stator core and operable in response to the flow of external power from the external power supply to rotate about an axis; a stator encasement member formed around the stator core to completely encase the stator core, the stator encasement member defining a cavity; a bearing support integrally-formed as a single part with the stator encasement member; a rotor encasement member formed around the rotor core to completely encase the rotor core, at least a portion of the rotor encasement member and the rotor core disposed within the cavity; and a substantially non-metallic bearing disposed in the bearing support and adapted to at least partially support the rotor core for rotation. ### Claim 20 (depends on 19) The motor of claim 19, wherein the stator encasement member and the rotor encasement member are formed from a polymer that is injection molded around the stator core and the rotor core respectively.