Motor, powertrain, and device

Patent metadata

Field	Value
Publication number	US-12476500-B2
Application number	US-202318321102-A
Country	US
Kind code	B2
Filing date	May 22, 2023
Priority date	Nov 25, 2020
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A motor, a powertrain, and a device. A plurality of first oil channels are formed between an inner surface of a housing and an outer surface of a stator core, second oil channels are formed at groove roots of coil slots of the stator core, to form double-layer oil channels at the outer surface of the stator core and the root of the coil slot of the stator core, and ensure effective cooling of the stator core and a coil winding. After cooling oil is injected from an oil filling port, a flow direction of the cooling oil in some of the second oil channels is opposite to that of cooling oil in a remaining second oil channel, so that interleaved reverse flows are implemented, and axial temperature of the stator core and the coil winding is more even.

First claim

The invention claimed is:

1 . A motor, comprising a housing, wherein at least a stator is disposed in the housing, the stator comprises a stator core and a coil winding, an inner surface of the stator core is provided with a plurality of coil slots disposed at intervals, and the coil winding is partially located inside the coil slots;
a plurality of first oil channels is formed between an inner surface of the housing and an outer surface of the stator core, wherein the plurality of first oil channels is circumferentially disposed at intervals along a periphery of the stator core, and the first oil channels are all connected to an oil filling port provided on the housing; second oil channels are formed at slot bottoms of at least some of the coil slots, the slot bottoms is the part of the coil slots that is farthest from the center axis of the stator core; and one end of the plurality of first oil channels is connected to one end of some of the second oil channels, the other end of the some of the second oil channels is connected to nozzles at one end of the motor, the other end of the plurality of first oil channels is connected to one end of a remaining second oil channel, and the other end of the remaining second oil channel is connected to nozzles at the other end of the motor; a first end cap and a second end cap are respectively located at two ends of the stator core, the first end cap is provided with a plurality of first nozzles disposed at intervals, and the second end cap is provided with a plurality of second nozzles disposed at intervals; or a first end cap of the motor comprises at least a first annular end plate, a second end cap of the motor comprises at least a second annular end plate, a plurality of first nozzles is circumferentially disposed at intervals along the first annular end plate, a plurality of second nozzles is circumferentially disposed at intervals along the second annular end plate, orthographic projections of the plurality of second nozzles towards the first annular end plate and the plurality of first nozzles are circumferentially arranged alternately on the first annular end plate.

2 . The motor according to claim 1 ,
When the first end cap is provided with a plurality of first nozzles disposed at intervals, and the second end cap is provided with a plurality of second nozzles disposed at intervals, wherein: one end of the plurality of first oil channels is connected to one end of the some of the second oil channels through the first end cap, and the other end of the some of the second oil channels is connected to the plurality of second nozzles; and the other end of the plurality of first oil channels is connected to one end of the remaining second oil channel through the second end cap, and the other end of the remaining second oil channel is connected to the plurality of first nozzles.

3 . The motor according to claim 2 , wherein a third oil channel is formed between the first end cap and one end face of the stator core;
a fourth oil channel is formed between the second end cap and the other end face of the stator core; one end of the plurality of first oil channels is connected to one end of the some of the second oil channels through the third oil channel, and the other end of the plurality of first oil channels is connected to one end of the remaining second oil channel through the fourth oil channel; and the first nozzle is spaced from the third oil channel and is connected to the fourth oil channel, and the second nozzle is spaced from the fourth oil channel and is connected to the third oil channel.

4 . The motor according to claim 3 , wherein when the first end cap comprises at least a first annular end plate and the second end cap comprises at least a second annular end plate, the third oil channel is formed between the first annular end plate and one end face of the stator core; and
the fourth oil channel is formed between the second annular end plate and the other end face of the stator core.

5 . The motor according to claim 4 , wherein an inner edge of the first annular end plate is provided with a plurality of first separation blocks disposed at intervals, one end of the first separation block abuts on one end face of the stator core, the first separation block is provided with the first nozzle, and the first nozzle is separated from the third oil channel by using the first separation block; and
an inner edge of the second annular end plate is provided with a plurality of second separation blocks disposed at intervals, one end of the second separation block abuts on the other end face of the stator core, the second separation block is provided with the second nozzle, and the second nozzle is separated from the fourth oil channel by using the second separation block.

6 . The motor according to claim 5 , wherein the first separation block is provided with a first recessed portion, and the first nozzle is located at the first recessed portion; and
the second separation block is provided with a second recessed portion, and the second nozzle is located at the second recessed portion.

7 . The motor according to claim 4 , wherein the first end cap further comprises an axially protruded first extension plate connected to an outer edge of the first annular end plate, and the second end cap further comprises an axially protruded second extension plate connected to an outer edge of the second annular end plate;
a first oil injection chamber is formed between an outer surface of the first extension plate and the housing, and the first extension plate is provided with a third nozzle connected to the first oil injection chamber; a second oil injection chamber is formed between an outer surface of the second extension plate and the housing, and the second extension plate is provided with a fourth nozzle connected to the second oil injection chamber; and both the first oil injection chamber and the second oil injection chamber are connected to the oil filling port.

8 . The motor according to claim 7 , wherein both the first extension plate and the second extension plate are of annular structures, and both the first oil injection chamber and the second oil injection chamber are annular chambers.

9 . The motor according to claim 7 , wherein both the first extension plate and the second extension plate are arc segments, and the first extension plate and the second extension plate are located at top outer edges of the first annular end plate and the second annular end plate, respectively.

10 . The motor according to claim 7 , wherein a plurality of first through grooves and a plurality of second through grooves are provided on the outer surfaces of the first extension plate and the second extension plate, respectively;
two ends of the plurality of first through grooves are connected to the first oil injection chamber and one end of the plurality of first oil channels, respectively; and two ends of the plurality of second through grooves are connected to the second oil injection chamber and the other end of the plurality of first oil channels, respectively.

11 . The motor according to claim 7 , wherein a fifth oil channel is disposed in the housing, and the fifth oil channel is connected to all of the oil filling port, the first oil injection chamber, and the second oil injection chamber.

12 . The motor according to claim 4 , wherein the first end cap further comprises an axially protruded first extension plate connected to an outer edge of the first annular end plate, and the second end cap further comprises an axially protruded second extension plate connected to an outer edge of the second annular end plate;

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Liu Hongbing
• Xu Haisong
• Eerhemu Bayaer
• Yang Shaobo
• Chen Jun

Classifications

• H02K5/203

  specially adapted for liquids, e.g. cooling jackets · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H02K5/20

  with channels or ducts for flow of cooling medium · CPC title

• H02K3/24

  with channels or ducts for cooling medium between the conductors · CPC title