# US 2014/0191597 A1 · Enhanced cooling of enclosed air cooled high power motors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191597 A1 - Document ID: US20140191597A1 - Status: Published application - Kind: A1 - Application number: 13/736,523 - Filed: 2013-01-08 - Published: 2014-07-10 - Earliest claimed: 2013-01-08 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Debabrata Pal - Web page: https://patentgrep.com/patent/US20140191597A1 ## CPC - H02K 9/08: by gaseous cooling medium circulating wholly within the machine casing (H02K9/10 takes precedence) - H02K 9/18: wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A fully enclosed fan motor assembly includes a motor housing. A stator is located radially inward from the motor housing. A rotor is located radially inward from the stator, and the gap in between the rotor and stator defines a rotor stator gap. A shaft is located radially inward from the rotor. A fin portion extending radially outward from the shaft is used to dissipate heat from the rotor to air drawn through the rotor stator gap and over the fin portion. ## Claims ### Claim 1 A fan motor assembly comprising: a motor housing, a stator located radially inward from the motor housing; a rotor located radially inward from the stator, the stator and the rotor defining a rotor stator gap there between; a shaft located radially inward from and connected to the rotor; and a heat exchanger mounted on and extending radially outward from the shaft, the heat exchanger is positioned to transfer heat to air drawn through the rotor stator gap. ### Claim 2 (depends on 1) The fan motor assembly of claim 1, wherein heat exchanger comprises at least one fin. ### Claim 3 (depends on 2) The fan motor assembly of claim 2, wherein the at least one fin extends radially outward in a direction generally perpendicular to the shaft. ### Claim 4 (depends on 3) The fan motor assembly of claim 3, wherein the at least one fin is disposed on a first end of the shaft upstream from the rotor. ### Claim 5 (depends on 3) The fan motor assembly of claim 3, wherein the at least one fin is disposed on a second end of the shaft downstream from the rotor. ### Claim 6 (depends on 1) The fan motor assembly of claim 1, wherein air is drawn through the rotor stator gap. ### Claim 7 (depends on 6) The fan motor assembly of claim 6, wherein an impeller is disposed on a portion of the shaft upstream from the rotor. ### Claim 8 (depends on 6) The fan motor assembly of claim 6, wherein an impeller is disposed on a portion of the shaft downstream from the rotor. ### Claim 9 (depends on 6) The fan motor assembly of claim 6, wherein the motor housing includes a plurality of cooling channels disposed between a radially outer surface of the motor housing and a radially inner surface of the motor housing, the cooling channels extending in an axial direction parallel to the shaft. ### Claim 10 (depends on 9) The fan motor assembly of claim 9, wherein the cooling channels function as heat exchangers for air drawn through the rotor stator gap, whereby the air drawn through the rotor stator gap is cooled by a main fan air flow over the outer surface of the motor housing. ### Claim 11 (depends on 1) The fan motor assembly of claim 1, wherein the fan motor assembly is totally enclosed. ### Claim 12 A fan motor assembly comprising: a fan casing; a fan impeller located in an upstream portion of the fan casing; a motor housing mounted within the fan casing, with fan stator vanes mounted on and extending radially from the motor housing; a stator located radially inward from the motor housing; a rotor located radially inward from the stator, the stator and the rotor defining a rotor stator gap there between; a shaft located radially inward from and connected to the rotor; and a heat exchanger mounted on and extending radially outward from the shaft, the heat exchanger is positioned to transfer heat to air drawn through the rotor stator gap. ### Claim 13 (depends on 12) The fan motor assembly of claim 12, wherein heat exchanger comprises at least one fin. ### Claim 14 (depends on 13) The fan motor assembly of claim 13, wherein the at least one fin extends radially outward in a direction generally perpendicular to the shaft. ### Claim 15 (depends on 14) The fan motor assembly of claim 14, wherein the at least one fin is disposed on at least end of the shaft. ### Claim 16 (depends on 15) The fan motor assembly of claim 15, wherein air is drawn through the rotor stator gap. ### Claim 17 (depends on 16) The fan motor assembly of claim 16, wherein an impeller is disposed the end of the shaft opposite from the at least one fin. ### Claim 18 (depends on 15) The fan motor assembly of claim 15, wherein the motor housing includes a plurality of cooling channels disposed between a radially outer surface of the motor housing and a radially inner surface of the motor housing, the cooling channels extending in an axial direction parallel to the shaft. ### Claim 19 (depends on 18) The fan motor assembly of claim 18, wherein the cooling channels function as heat exchangers for air drawn through the rotor stator gap, whereby the air drawn through the rotor stator gap is cooled by a main fan air flow over the outer surface of the motor housing. ### Claim 20 (depends on 12) The fan motor assembly of claim 12, wherein the fan motor assembly is totally enclosed.