# US 10,873,229 B2 · Motor air flow cooling > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,229 B2 - Document ID: US10873229B2 - Status: Granted - Kind: B2 - Application number: 15/615,738 - Filed: 2017-06-06 - Published: 2018-01-04 - Granted: 2020-12-22 - Earliest claimed: 2008-09-23 - Assignees: AeroVironment, Inc. - Applicants: AeroVironment, Inc. - Inventors: Lindsay Aspinwall Sheppard; Bart Dean Hibbs - Web page: https://patentgrep.com/patent/US10873229B2 ## CPC - H02K 3/14: with transposed conductors, e.g. twisted conductors - H02K 3/30: Windings characterised by the insulating material - H02K 3/32: Windings characterised by the shape, form or construction of the insulation - H02K 3/47: Air-gap windings, i.e. iron-free windings - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - H02K 9/02: by ambient air flowing through the machine - H02K 9/06: with fans or impellers driven by the machine shaft - H02K 9/14: wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle - H02K 9/227: {Heat sinks} - H02K 16/02: Machines with one stator and two {or more} rotors - H02K 21/12: with stationary armatures and rotating magnets - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y10T 29/49009: Dynamoelectric machine - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract In one possible embodiment, an aircraft electric motor cooling system is provided having an airflow path through a spinner which includes a first airflow path between an inner rotor and a stator, a second airflow path between an outer rotor the stator and a third airflow path along an outer surface of the outer rotor. ## Claims ### Claim 1 A method for air cooling an electric aircraft motor comprising: a) passing an air flow through a spinner; b) directing a first portion of the air flow to flow between a stator and an inner rotor such that the first portion extends between and along inner rotor magnets and one side of a stator coil; c) directing a second portion of the air flow to flow between the stator and an outer rotor, such that the second portion extends between and along outer rotor magnets and an other side of the stator coil; d) directing a third portion of the air flow to flow along an outer surface of the outer rotor; and e) directing a front cooling fin portion of the air flow through front stator cooling fins, and wherein the second and third portion are derived at least in part from the cooling fin portion of the air flow through the spinner. ### Claim 2 (depends on 1) The method of claim 1, wherein the first portion flows along inner rotor magnets. ### Claim 3 (depends on 2) The method of claim 2, wherein the second portion of the air flow flows along outer rotor magnets. ### Claim 4 (depends on 2) The method of claim 2, wherein the first portion flows along a front stator yoke and along a rear stator yoke. ### Claim 5 (depends on 1) The method of claim 1, wherein the second portion of the air flow flows along outer rotor magnets. ### Claim 6 (depends on 5) The method of claim 5, wherein the second portion flows along a front stator yoke and a rear stator yoke. ### Claim 7 (depends on 1) The method of claim 1, further comprising returning the first, second, and third portions of the air flow to an air stream. ### Claim 8 An electric aircraft motor comprising: a) an inner rotor connected with an outer rotor; b) a stator comprising a winding located between the inner rotor and the outer rotor; c) a spinner; d) a cooling system comprising: i) an airflow path through the spinner comprising: (1) a first airflow path between an inner rotor and a stator; and (2) a second airflow path between an outer rotor the stator; and e) rear cooling fins thermally coupled to a rear portion of the stator, the rear cooling fins extending beyond an outer radius of the spinner. ### Claim 9 (depends on 8) The motor of claim 8, further comprising the airflow path through the spinner extending through the rear cooling fins. ### Claim 10 (depends on 8) The motor of claim 8, wherein the first airflow path extends along inner rotor magnets, and wherein the second airflow path extends along outer rotor magnets. ### Claim 11 (depends on 8) The motor of claim 8, wherein the first airflow path extends along a front stator yoke and along a rear stator yoke. ### Claim 12 (depends on 8) The motor of claim 8, wherein the second airflow path extends along a front stator yoke and a rear stator yoke. ### Claim 13 A method for air cooling an electric aircraft motor comprising: a) passing an air flow through a spinner; b) directing a first portion of the air flow to flow between a stator and an inner rotor; c) directing a second portion of the air flow to flow between the stator and an outer rotor; d) directing a third portion of the air flow to flow along an outer surface of the outer rotor; e) directing a front cooling fin portion of the air flow through front stator cooling fins, and wherein the second and third portion are derived at least in part from the cooling fin portion of the air flow through the spinner; and f) returning the first portion, the second portion, and the third portion of the air flow to an air stream.