# US 12,015,328 B2 · End shield and rotor for a rotary electric machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,328 B2 - Document ID: US12015328B2 - Status: Granted - Kind: B2 - Application number: 18/254,376 - Filed: 2021-11-23 - Published: 2023-10-26 - Granted: 2024-06-18 - Earliest claimed: 2020-11-30 - Assignees: Nidec Psa Emotors - Applicants: Nidec Psa Emotors - Inventors: Jean Baptiste Roux; Juan Wang; Ioan Deac; Diana Fantuz - Web page: https://patentgrep.com/patent/US12015328B2 ## CPC - H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil - H02K 1/32: with channels or ducts for flow of cooling medium - H02K 5/15: Mounting arrangements for bearing-shields or end plates - Y02E 10/72: Wind turbines with rotation axis in wind direction - 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 ## Abstract The present invention relates to an end shield (10) for a rotary electric machine, including one or more feed channels (12) for feeding a coolant supplied from a channel formed in a rotor lamination stack (8) or in a shaft of the rotor or between the rotor lamination stack and the shaft, wherein at least one feed channel (12) has a spray portion (18) for spraying the coolant, said spray portion (18) being placed in the last two thirds of the feed channel (12), when considered in the direction in which the coolant circulates. ## Claims ### Claim 1 An end shield for a rotary electric machine, including one or more feed channels for feeding a coolant supplied from a channel formed in a rotor lamination stack or in a shaft of a rotor or between the rotor lamination stack and the shaft, wherein at least one feed channel of the one or more feed channels has a spraying portion for spraying the coolant, said spraying portion being disposed in the last two thirds of the feed channel, when considered in the direction in which the coolant circulates, the end shield including a flared terminal portion located after the spraying portion, when moving in the direction of circulation of the coolant, the flared terminal portion including a bottom inclined at an angle α relative to a plane perpendicular to the rotational axis of the rotor, edges of the feed channel at the spraying portion each having a first trough, a second trough, and two bumps. ### Claim 2 (depends on 1) The end shield according to claim 1, the spraying portion of the at least one feed channel including one or more pins disposed across the coolant flow. ### Claim 3 (depends on 2) The end shield according to claim 2, the pins being molded or cast as one part with the rest of the end shield. ### Claim 4 (depends on 2) The end shield according to claim 2, the pins being oriented parallel to a rotational axis of the rotor. ### Claim 5 (depends on 2) The end shield according to claim 2, the pins being disposed in one or more rows. ### Claim 6 (depends on 5) The end shield according to claim 5, the pins being disposed in staggered rows. ### Claim 7 (depends on 1) The end shield according to claim 1, a surface area of the cross-section of the spraying portion being between 3 mm2 and 30 mm2. ### Claim 8 (depends on 1) The end shield according to claim 1, the flared terminal portion forming a flare angle β in the plane perpendicular to the axis of rotation of the rotor. ### Claim 9 (depends on 8) The end shield according to claim 8, the flare angle β being between 10° and 50°. ### Claim 10 (depends on 1) The end shield according to claim 1, the edges of the at least one feed channel having curved portions at the spraying portion. ### Claim 11 (depends on 1) The rotor of the rotary electric machine, including the rotor lamination stack and at least one end shield according to claim 1. ### Claim 12 (depends on 11) The rotor according to claim 11, wherein at least one axial channel for distributing the coolant to the end shield is formed in the rotor stack or between the rotor stack and the shaft, along the shaft. ### Claim 13 (depends on 11) The rotary electric machine including the rotor according to claim 11, and a stator. ### Claim 14 (depends on 13) The rotary electric machine according to claim 13, including the shaft on which an internal channel for supplying coolant runs over at least part of its length. ### Claim 15 (depends on 13) A method for cooling the rotary electric machine as defined in claim 13, wherein the coolant is circulated in opposite directions within the rotor, then the coolant is sprayed onto the coil heads of the stator. ### Claim 16 (depends on 1) The end shield according to claim 1, the angle α being between 2° and 30°. ### Claim 17 (depends on 1) The end shield according to claim 1 wherein the second trough is smaller than the first trough. ### Claim 18 (depends on 1) The end shield according to claim 1 wherein the two bumps are placed at opposite sides of the first trough. ### Claim 19 An end shield for a rotary electric machine, including one or more feed channels for feeding a coolant supplied from a channel formed in a rotor lamination stack or in a shaft of a rotor or between the rotor lamination stack and the shaft, wherein at least one feed channel of the one or more feed channels has a spraying portion for spraying the coolant, said spraying portion being disposed in the last two thirds of the feed channel, when considered in the direction in which the coolant circulates, the end shield including a flared terminal portion, when moving in the direction of circulation of the coolant, the flared terminal portion including a bottom inclined at an angle α relative to a plane perpendicular to the rotational axis of the rotor, at least one feed channel of the one or more feed channels including a cross-sectional constriction, the cross-section of the at least one feed channel decreasing and then increasing in a radial direction relative to the rotational axis of the machine, as seen when moving in the direction of circulation of the coolant.