EP4562744A1 - Stator für eine elektrische maschine mit einer einrichtung zum kühlen des stators - Google Patents
Stator für eine elektrische maschine mit einer einrichtung zum kühlen des statorsInfo
- Publication number
- EP4562744A1 EP4562744A1 EP23742232.4A EP23742232A EP4562744A1 EP 4562744 A1 EP4562744 A1 EP 4562744A1 EP 23742232 A EP23742232 A EP 23742232A EP 4562744 A1 EP4562744 A1 EP 4562744A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stator
- shell
- jacket
- electrical machine
- coolant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Definitions
- Stator for an electrical machine with a device for cooling the stator
- the invention relates to a stator for an electrical machine, with a stator laminated core and stator windings, which are designed to generate a rotating electric field in a current-carrying state, and with a device for cooling the stator with a cooling liquid.
- Electric machines of this type are increasingly being used in electrically powered vehicles or hybrid vehicles.
- Such an electric machine is primarily used as an electric motor to drive a wheel or an axle of a vehicle.
- the electric motor can be designed, among other things, as a synchronous motor or an asynchronous motor.
- the electric motor is usually mechanically coupled to a gearbox to adjust the speed.
- the electric motor is normally electrically connected to an inverter, which generates an alternating voltage for operating the electrical machine from a direct voltage supplied by a battery, in particular a multi-phase alternating voltage.
- the electric machine it is also possible to operate the electric machine as a generator for recuperating the kinetic energy of a vehicle, whereby the kinetic energy is first converted into electrical energy and then into chemical energy from the battery.
- the stator of a conventional electrical machine usually has a stator laminated core and stator windings. When a current is applied to the stator windings, a rotating electric field is created, which causes a rotor to rotate. When the electric machine is operating, the stator, among other things, heats up considerably, with the resulting heat being proportional to the electrical current applied. A particularly large amount of heat is generated when the electrical machine is operated at high power. However, certain components of the electrical machine, such as the stator windings, can reach their thermal load limits.
- the stator In order to be able to dissipate the resulting heat, the stator usually has a cooling device.
- the cooling device can comprise a cooling channel through which a liquid coolant can flow.
- the coolant which can be, for example, a water-glycol mixture or an oil, is conveyed in a circuit. This means that the temperature of the stator windings can be kept below a specified limit even under high loads.
- a stator should be cooled as evenly as possible in order to avoid local hot spots.
- conventional electrical machines are, for example, provided with a cooling jacket through which water flows.
- a cooling jacket requires that the cooling jacket be integrated into the structure of the electrical machine.
- the device comprises a hollow cylindrical stator jacket surrounding the stator laminated core and the stator windings with a radial inlet, on the inside of which spiral-shaped projections are formed, which together with the outside of the stator laminated core have channels for the coolant.
- the invention is based on the knowledge that a stator can be provided with a cooling device particularly easily by arranging the cooling device on the outside of the stator laminated core.
- the stator laminated core is surrounded by a stator jacket, which is designed as a hollow cylinder. Inside this hollow cylinder there are spiral-shaped projections which, together with the outside of the stator laminated core, form cooling channels.
- Such a stator has the advantage that no modification of the stator laminated core is required.
- the stator jacket can simply be attached to the outside, thereby forming the cooling channels. Accordingly, a stator can very easily be provided with a cooling device for a cooling liquid, in which cooling takes place from the outside of the stator laminated core.
- the radial inlet for the coolant is arranged at least approximately in the middle of the stator jacket with respect to the axial direction and the spiral channels for the coolant extend from the inlet to both axial ends of the stator jacket.
- Such an arrangement of the inlet and the channels ensures that the cooling liquid supplied from the center of the stator jacket flows in the direction of the two ends of the stator jacket and thereby dissipates heat particularly evenly.
- the stator jacket has a first half-shell and a second half-shell connected thereto.
- the two half-shells are first positioned around the stator package and then connected to each other.
- the two half-shells can be welded and/or glued and/or locked together.
- the stator laminated core having the stator windings can be provided with the stator jacket in a comparatively late assembly step.
- interconnected edges of the half-shells define a parting plane, the first half-shell having one or more recesses and the second half-shell having one or more projections designed in opposite directions, which are inserted and/or locked into the recesses.
- the two half-shells that form the stator jacket are made of a plastic material.
- the half-shells can also preferably be produced by injection molding.
- a ring having through openings is arranged on one axial side or on both axial sides of the stator. Coolant supplied via the cooling channels can be supplied to the winding heads of the stator windings through this ring, in particular through openings arranged in the ring, in order to cool the stator windings.
- the invention also relates to a method for producing a stator of the type described for an electrical machine, with the following steps:
- the invention relates to an electrical machine with a stator of the type described, which surrounds a rotor that can be rotated with respect to the stator.
- the electrical machine can have a housing that surrounds the stator.
- it can also be an electrical machine without a housing act, in which the outside is formed by the stator itself and two axial covers or flanges.
- the cooling liquid can contain an oil.
- a further development of the electrical machine according to the invention provides that it has a flange with a plurality of through openings for fastening the electrical machine, the inlet for the coolant of the stator jacket being arranged in the circumferential direction adjacent to one of the through openings.
- Such an arrangement is particularly space-saving because the inlet does not protrude beyond the outer contour of the flange.
- the inlet can be arranged so that it is aligned in the axial direction with the passage opening, which facilitates the installation of the electric machine in a vehicle.
- the object on which the invention is based is further achieved by a vehicle which has an electric machine according to the invention which is configured to drive the vehicle.
- the vehicle can have a transmission coupled to the electric machine and/or an inverter connected to the machine, with which a multi-phase alternating voltage required to operate the electric machine can be provided.
- Fig. 1 is a sectional view of an electrical machine with a stator according to the invention
- Fig. 2 is a perspective view of a stator jacket connected to a flange
- Fig. 3 is a sectional view of the inside of the stator casing
- Fig. 5 shows a motor vehicle according to the invention.
- Fig. 1 is a sectional view of an electrical machine 22 with a stator 1 according to the invention.
- the stator 1 includes a stator laminated core 2 and stator windings 3. When a current is applied, the stator windings 3 generate a rotating electric field.
- FIG. 1 On the left side in FIG. 1 there is a flange 4, on the right side in FIG. 1 there is an axial cover 5.
- a rotor shaft of a rotor 6 In the center of the stator 1 there is a rotor shaft of a rotor 6 with a cavity.
- the flange 4 has a central opening through which the rotor shaft passes.
- the stator 1 has a cooling device with a hollow cylindrical stator jacket 7.
- the stator jacket 7 surrounds the stator laminated core 2 with the stator windings 3.
- the stator jacket 7 has a coolant line 8 that runs parallel to the axial direction and opens into a radial inlet 9.
- the coolant line 8 is connected to a coolant reservoir via a line, not shown. By means of a pump, coolant is conveyed in a circuit through the coolant line 8 and the radial inlet 9 into the stator jacket 7.
- stator windings 3 On both axial sides of the stator windings 3 there are through openings within the flange 4 or the axial cover 5 having ring 23 to conduct coolant to winding heads 24 of the stator windings 3.
- Fig. 2 is a perspective view of the stator shell 7 connected to the flange 4.
- the axially extending coolant line extends from an axial end to approximately the middle of the stator jacket 7.
- the stator jacket 7 includes a first half-shell 10 and a second half-shell 11, which are connected to one another and form the annular stator jacket 7.
- Fig. 3 is a sectional view of the stator casing 7 and shows its inside. You can see there spiral-shaped projections 13, which extend symmetrically in both opposite axial directions starting from the inlet 9 for the coolant. In the radial direction, the projections 13 extend to the outside of the stator windings 3. This forms cooling channels 14, which are delimited by the inside 12 of the stator jacket 7, the spiral-shaped projections 13 and the outside of the stator windings 3.
- the cooling channels 14 run spirally from the center of the stator jacket 7 outwards in both axial directions. Accordingly, coolant, which is supplied via the coolant line 8 and the inlet 9, is guided through the cooling channels 14 in a spiral shape around the outside of the stator jacket 7, whereby heat from the stator laminated core 2 and the stator windings 3 is optimally dissipated.
- the temperature of the stator windings 3 can be limited to a specified value when the electrical machine 1 is operating.
- Fig. 4 shows an enlarged section of the parting plane of the two interconnected half-shells 10, 11 of the stator jacket 7.
- the first half-shell 10 has a recess 15 designed as a groove, which extends over the entire axial length of the first half-shell 10.
- the second half-shell 11 has a projection 16 designed in the opposite direction, which also extends over the entire axial length of the second half-shell 11 extends.
- Each half-shell 10, 11 has such a recess 15 and such a projection 16, on which the two half-shells 10, 11 can be locked or pressed together to form the tubular stator jacket 7.
- the connection of the two half-shells 10, 11 can also be made by gluing or welding.
- FIG. 5 shows a vehicle 17 with a drive train that includes the electric machine 22.
- the electric machine 22 is coupled to a wheel 19 of the vehicle 17 via a transmission 18.
- the electrical machine 22 is electrically connected to an inverter 20.
- a battery 21 supplies a direct voltage, which is converted by the inverter 20 into an alternating voltage for operating the electrical machine 22.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022207889.6A DE102022207889A1 (de) | 2022-07-29 | 2022-07-29 | Stator für eine elektrische Maschine mit einer Einrichtung zum Kühlen des Stators |
| PCT/EP2023/069368 WO2024022827A1 (de) | 2022-07-29 | 2023-07-12 | Stator für eine elektrische maschine mit einer einrichtung zum kühlen des stators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4562744A1 true EP4562744A1 (de) | 2025-06-04 |
Family
ID=87377701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23742232.4A Withdrawn EP4562744A1 (de) | 2022-07-29 | 2023-07-12 | Stator für eine elektrische maschine mit einer einrichtung zum kühlen des stators |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4562744A1 (de) |
| CN (1) | CN119856371A (de) |
| DE (1) | DE102022207889A1 (de) |
| WO (1) | WO2024022827A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7009317B2 (en) * | 2004-01-14 | 2006-03-07 | Caterpillar Inc. | Cooling system for an electric motor |
| JP4919106B2 (ja) * | 2009-01-15 | 2012-04-18 | アイシン・エィ・ダブリュ株式会社 | ステータ |
| WO2011163226A2 (en) * | 2010-06-21 | 2011-12-29 | Nidec Motor Corporation | Electric motor assemblies including stator and/or rotor cooling |
| ITBO20120681A1 (it) * | 2012-12-18 | 2014-06-19 | Ferrari Spa | Macchina elettrica rotante per autotrazione con raffreddamento a liquido |
| DE102014112223A1 (de) * | 2014-08-26 | 2016-03-03 | Karlsruher Institut für Technologie | Kühleinrichtung |
| US20170310189A1 (en) * | 2016-04-25 | 2017-10-26 | Ford Global Technologies, Llc | Stator Cooling For Electric Machines |
| JP2018066076A (ja) * | 2016-10-18 | 2018-04-26 | 株式会社アイ企画 | 男性用下着及び吸水性パッド |
| EP3553922A1 (de) * | 2018-04-09 | 2019-10-16 | Carl Freudenberg KG | Gehäuseanordnung für eine elektrische maschine mit einem mantel aus kunststoff |
| DE102018122414B4 (de) * | 2018-09-13 | 2024-10-10 | Witzenmann Gmbh | Temperiervorrichtung und Verfahren zum Temperieren eines Elektromoduls |
-
2022
- 2022-07-29 DE DE102022207889.6A patent/DE102022207889A1/de active Pending
-
2023
- 2023-07-12 CN CN202380064559.8A patent/CN119856371A/zh active Pending
- 2023-07-12 WO PCT/EP2023/069368 patent/WO2024022827A1/de not_active Ceased
- 2023-07-12 EP EP23742232.4A patent/EP4562744A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024022827A1 (de) | 2024-02-01 |
| DE102022207889A1 (de) | 2024-02-01 |
| CN119856371A (zh) | 2025-04-18 |
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