WO2022258281A1 - Blechpaketeinrichtung für eine elektrische maschine sowie elektrische maschine - Google Patents
Blechpaketeinrichtung für eine elektrische maschine sowie elektrische maschine Download PDFInfo
- Publication number
- WO2022258281A1 WO2022258281A1 PCT/EP2022/062613 EP2022062613W WO2022258281A1 WO 2022258281 A1 WO2022258281 A1 WO 2022258281A1 EP 2022062613 W EP2022062613 W EP 2022062613W WO 2022258281 A1 WO2022258281 A1 WO 2022258281A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laminated core
- core device
- heat
- thermally conductive
- insert
- Prior art date
Links
- 238000003475 lamination Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims description 34
- 229910052751 metal Inorganic materials 0.000 claims description 29
- 239000002184 metal Substances 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000004804 winding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating 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
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/225—Heat pipes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/227—Heat sinks
Definitions
- the invention relates to a laminated core device for an electrical machine and an electrical machine.
- Ohmic losses in rotor windings and stator windings as well as iron losses in laminated cores exposed to alternating magnetic fields must be supplied to a heat sink or cooled in order to avoid overheating of the insulation of the windings or magnets in permanently excited machines, for example.
- cooling current-carrying components of the electrical machine improves the efficiency of the electrical machine, since the electrical resistance decreases at low operating temperatures and ohmic power losses decrease. It is therefore already generally known to cool electrical machines, for example by means of a water jacket in the housing, by means of open or closed air cooling or in the rotating rotor, for example by means of a liquid-cooled hollow shaft.
- EP 2 807732 B1 discloses an electrical machine with a stator, a rotor mounted so as to be rotatable about an axis of rotation, and a shaft on which the rotor is fastened.
- the rotor includes a laminated core made from a first material and a cast-on short-circuit ring made from a second material, the second material having a specific thermal conductivity that is greater than a specific thermal conductivity of the first material.
- This cast-on short ring has an attachment area on, which is directly connected to the shaft. This short-circuit ring can be used to transfer waste heat from the rotor to the shaft.
- the invention relates to a laminated core device for an electrical machine, with a plurality of laminates stacked on top of one another in a stacking direction.
- This electrical machine is in particular an electric motor for a motor vehicle, by means of which the motor vehicle can be driven via electrical energy.
- the respective sheets stacked in the stacking direction may be wound with a wire to provide a coil and an electromagnet via this coil.
- heat can develop in the coils, which can adversely affect the efficiency of the electrical machine.
- a single thermal connection between motor windings or stator windings and a cooled hollow shaft or a housing cooling jacket is heat conduction via the laminated core, which due to its structure only provides comparatively poor thermal conductivity.
- the respective laminations of the laminated core are made of steel coated with a paint.
- the laminated core device has at least one thermally conductive insert which is stacked between two metal sheets in the stacking direction and which has a higher thermal conductivity than the adjacent metal sheets.
- the thermal conductivity of the entire laminated core device can thus be improved by means of the at least one thermally conductive insert, as a result of which heat can be transported away particularly well from the laminates of the laminated core device.
- the laminations of the laminated core device are cooled particularly well, which in turn results in a particularly high degree of efficiency of the electrical machine having the laminated core device can be reached.
- the at least one thermally conductive insert is stacked together with the metal sheets in the stacking direction, as a result of which the thermally conductive insert rests against a metal sheet on opposite side surfaces in each case.
- the thermally conductive insert can transport heat away from the adjacent metal sheets, as a result of which the metal sheets of the laminated core device can be cooled particularly well. Due to the arrangement of the at least one heat-conducting insert between the laminations of the laminated core device, a particularly large amount of heat can be dissipated from the laminated core device.
- the laminated core device has a cooling side, in which all the laminated cores of the laminated core device can be placed against a heat sink.
- the at least one heat-conducting insert is flush with the metal sheets on this cooling side.
- the heat sink is set up to transport the heat received from the laminated core device away from the laminated core device in order to cool the laminated core device. Due to the fact that all of the laminations of the laminated core device can be placed against the heat sink on the cooling side, heat can be released from all of the laminations of the laminated core device to the heat sink.
- the at least one heat-conducting insert is flush with the stacked metal sheets on the cooling side, the at least one heat-conducting insert with the metal sheets can also be placed against the heat sink, which means that heat can be transferred to the heat sink via the at least one heat-conducting insert. This enables particularly good heat dissipation from the laminated core device to the heat sink.
- the at least one heat-conducting insert comprises aluminum and/or copper.
- the at least one heat-conducting insert is made of aluminum or of copper or of an aluminum alloy or of a copper alloy.
- the thermally conductive insert if it comprises aluminum and/or copper, has a higher thermal conductivity than the sheets, which means that the at least one thermally conductive insert can be used to increase the thermal conductivity of the entire laminated core device. The provision of the at least one heat-conducting insert in the laminated core device thus enables particularly good cooling of the laminates.
- the at least one thermally conductive insert is hollow, with at least one fluid being filled in a cavity of the thermally conductive insert.
- the fluid heat can be absorbed by the metal sheets adjoining the heat-conducting insert and transported to the cooling side, as a result of which the heat can be transferred from the fluid to the heat sink via the cooling side.
- the provision of the thermally conductive insert with the cavity allows the fluid to flow within the cavity, as a result of which heat can be transferred particularly easily and quickly via the fluid from areas of the thermally conductive insert facing away from the cooling side to the cooling side of the thermally conductive insert by flowing the fluid.
- the fluid thus enables heat to be removed particularly quickly from the laminated core device via the cooling side to the heat sink.
- a thermal oil is filled into the cavity as the fluid.
- the thermal oil is in particular particularly temperature-resistant, as a result of which the risk of the thermal oil decomposing when the thermal oil is used in hot areas of the electrical machine can be kept particularly low.
- the thermal oil enables the laminated core device to be reliably cooled when it is used in the electric machine, even when heat develops in the electric machine.
- the at least one heat-conducting insert is designed as a two-phase thermosiphon.
- the at least one heat-conducting insert is hollow, with the fluid being arranged in the cavity of the heat-conducting insert, which fluid changes its state of aggregation at least once, in particular several times, for cooling the laminated core device.
- Water for example, can be filled into the cavity of the thermally conductive insert as the fluid.
- the cavity of the thermally conductive insert is evacuated and only partially filled with water.
- the water in the cavity can be at least partially evaporated from its liquid state when the rotor rotates due to heat absorption by the thermally conductive insert from surrounding metal sheets.
- Centrifugal forces can also cause liquid water to collect radially, starting from an axis of rotation of the rotor, in an outer area of the cavity, whereas the water vaporized into water vapor collects in an inner area of the cavity facing the axis of rotation.
- This inner area of the cavity is arranged in particular facing the cooling side of the at least one heat-conducting insert.
- the water vapor collected in the inner area of the cavity can be cooled via the cooling side of the laminated core device by dissipating heat from the laminated core device or from the water vapor to the heat sink and consequently condensed.
- the condensed water flows from the inner portion to the outer portion of the cavity due to the centrifugal force when the rotor rotates about the axis of rotation.
- Due to the design of the heat-conducting insert as a two-phase thermosiphon, a particularly large amount of heat can be dissipated particularly quickly from the laminated core device via the at least one heat-conducting insert to the heat sink.
- the outer edge of the at least one heat-conducting insert remains behind the metal sheets in the region of a pole shoe of the laminated core device.
- the at least one heat-conducting insert in the region of the pole shoe provided by the laminated core device can end set back behind an outer edge of the respective laminations.
- the at least one thermally conductive insert begins at a distance from the air gap, with the air gap running radially outside of the pole shoe. As a result, the occurrence of eddy current losses in the thermally conductive inserts can be reduced.
- the plurality of thermally conductive inserts can each have equal spacings from one another in the stacking direction. This allows a particularly uniform cooling of the thermally conductive insert Laminated core device can be achieved. For example, every ten metal sheets stacked one on top of the other in the stacking direction can be followed by a thermally conductive insert in the stacking direction, which in turn is followed by ten metal sheets stacked one on top of the other in the stacking direction.
- the invention also relates to an electrical machine, having a stator and a rotor which can be rotated about an axis of rotation relative to the stator.
- the stator and/or the rotor comprise a laminated core device, as has already been described in connection with the laminated core device according to the invention.
- Advantages and advantageous developments of the laminated core device according to the invention are to be regarded as advantages and advantageous developments of the electrical machine and vice versa.
- the provision of the laminated core device in the stator and/or the rotor of the electric machine allows the electric machine to be operated with a particularly high degree of efficiency and overheating of the electric machine can be at least essentially avoided.
- the rotor comprises the laminated core device, as has already been described in connection with the laminated core device according to the invention, and the laminated core device rests with its cooling side on a cooled rotor shaft of the electric machine.
- the rotor shaft defines the axis of rotation for the rotor.
- the rotor shaft can be designed, for example, as a hollow shaft through which a cooling fluid can flow.
- Fig. 1 shows a schematic perspective view of a laminated core device, which is part of a rotor of an electrical machine shown in detail and which bears against a rotor shaft of the electrical machine, as a result of which the laminated core device can be rotated about a rotor axis provided by the rotor shaft, the laminated core device having several in one
- FIG. 2 shows a schematic perspective view of the laminated core device in a further embodiment, in which a cross-sectional geometry of heat-conducting inserts arranged between respective laminations differs from the cross-sectional geometry of the laminations of the laminated core device in the region of a pole shoe.
- identical and functionally identical elements are provided with the same reference symbols.
- FIG. 1 and FIG. 2 show a laminated core device 10 which is part of a rotor of an electrical machine.
- This electrical machine can be set up in particular to drive a motor vehicle.
- the core assembly 10 forms a 60 degree segment of the rotor.
- the laminated core device 10 comprises a multiplicity of individual laminations 12 which are stacked on top of one another in a stacking direction 14 .
- the laminated core device 10 has a cooling side 16 on which the laminations 12 of the laminated core device 10 can be placed against a rotor shaft 18, as shown in FIG.
- the rotor shaft 18 shown in detail in FIG.
- the laminated core device 10 comprises at least one heat-conducting insert 20, here a plurality of heat-conducting inserts 20.
- the respective heat-conducting inserts 20 are flat and their outer contour is adapted to an outer contour of the metal sheets 12 .
- the thermally conductive inserts 20 cover the sheets 12 in the stacking direction 14. In the configuration of the thermally conductive inserts 20 shown in FIG.
- the respective thermally conductive inserts 20 are stacked in the stacking direction 14 between respective metal sheets 12 of the laminated core device 10 .
- the respective thermally conductive inserts 20 can have regular spacing from one another in the stacking direction 14 .
- a thermally conductive insert 20 can be arranged in the stacking direction 14 for every five sheets 12 stacked on top of one another.
- the heat-conducting inserts 20 end flush with the metal sheets 12 , as a result of which the heat-conducting inserts 20 can be applied to the rotor shaft 18 together with the metal sheets 12 . Heat can thus be transferred from the thermally conductive inserts 20 to the rotor shaft 18 via thermal conduction.
- the heat-conducting inserts 20 are also set up to absorb heat from adjacent metal sheets 12 in order to emit this absorbed heat to the heat sink on the cooling side 16 .
- the thermally conductive inserts 20 have a higher thermal conductivity than the metal sheets 12.
- the thermally conductive inserts 20 are made of copper.
- the thermally conductive inserts 20 can be made of aluminum.
- the thermally conductive inserts 20 can be designed with a cavity and thus hollow. A fluid can be filled in this cavity.
- this fluid is a thermal oil or water. If water is filled into the cavity of the respective thermally conductive inserts 20, with a region of the cavity being evacuated, then those thermally conductive inserts 20 are designed as a so-called two-phase thermosiphon.
- the heat-conducting inserts 20 can remain behind the laminations 12 with their respective outer edges, as can be seen in FIG. In the area of the pole shoe 22, the thermally conductive inserts 20 are not flush with the metal sheets 12 radially outwards. In one of the rotor shaft 18 In the area of the laminated core device facing them, the heat-conducting inserts 20 are designed to completely cover the metal sheets 12 and have an at least essentially identical external geometry.
- At least one slot insulation 24 can be arranged on the side of the laminated core device 10 .
- thermally conductive inserts 20 with good thermal conductivity, in particular discs made of copper or aluminum, between the metal sheets 12, an average thermal conductivity of the laminated core device 10 can be significantly increased and thus improved heat transport from a winding into the heat sink is achieved can be. This directly increases a continuous output of the electrical machine.
- the thermally conductive inserts 20 can be designed as hollow discs which are filled with a gaseous medium, a liquid medium or a phase change medium, which works according to the principle of a two-phase thermosiphon or a heat pump in particular can allow strong heat conduction.
- an active length of the electrical machine can be shortened by a thickness of the heat-conducting inserts 20, so that a longer stator or rotor has to be built for the same torque, or the currents provided have to be increased.
- the improved cooling provided by the thermally conductive inserts 20 can at least partially compensate for the associated losses.
- a heat output that can be dissipated increases by approximately 50 percent at the same temperature difference across the laminated core device 10 .
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280035851.2A CN117356015A (zh) | 2021-06-10 | 2022-05-10 | 用于电机的叠片铁心设备以及电机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021115033.7 | 2021-06-10 | ||
DE102021115033.7A DE102021115033A1 (de) | 2021-06-10 | 2021-06-10 | Blechpaketeinrichtung für eine elektrische Maschine sowie elektrische Maschine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022258281A1 true WO2022258281A1 (de) | 2022-12-15 |
Family
ID=81975316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/062613 WO2022258281A1 (de) | 2021-06-10 | 2022-05-10 | Blechpaketeinrichtung für eine elektrische maschine sowie elektrische maschine |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN117356015A (de) |
DE (1) | DE102021115033A1 (de) |
WO (1) | WO2022258281A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5091666A (en) * | 1990-06-15 | 1992-02-25 | General Electric Company | Stator cooling system for electrical machinery |
US20140183986A1 (en) * | 2012-12-31 | 2014-07-03 | Teco-Westinghouse Motor Company | Assemblies and Methods for Cooling Electric Machines |
US20140232221A1 (en) * | 2011-03-29 | 2014-08-21 | Asia Vital Components Co., Ltd. | Centrifugal Heat Dissipation Device and Motor Using Same |
CN208862646U (zh) * | 2018-08-28 | 2019-05-14 | 湖北同发机电有限公司 | 一种高散热速率的定子结构 |
EP2807732B1 (de) | 2012-03-08 | 2020-07-29 | Siemens Aktiengesellschaft | Elektrische maschine mit einem rotor zur kühlung der elektrischen maschine |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29514476U1 (de) | 1995-02-23 | 1995-11-23 | VEM-Elektroantriebe GmbH, 01259 Dresden | Anordnung zur Erhöhung der Wärmeleitung in Blechpaketen umlaufender elektrischer Maschinen |
US8466649B2 (en) | 2010-05-19 | 2013-06-18 | The Invention Science Fund I Llc | Heat removal from motor components |
-
2021
- 2021-06-10 DE DE102021115033.7A patent/DE102021115033A1/de active Pending
-
2022
- 2022-05-10 WO PCT/EP2022/062613 patent/WO2022258281A1/de active Application Filing
- 2022-05-10 CN CN202280035851.2A patent/CN117356015A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5091666A (en) * | 1990-06-15 | 1992-02-25 | General Electric Company | Stator cooling system for electrical machinery |
US20140232221A1 (en) * | 2011-03-29 | 2014-08-21 | Asia Vital Components Co., Ltd. | Centrifugal Heat Dissipation Device and Motor Using Same |
EP2807732B1 (de) | 2012-03-08 | 2020-07-29 | Siemens Aktiengesellschaft | Elektrische maschine mit einem rotor zur kühlung der elektrischen maschine |
US20140183986A1 (en) * | 2012-12-31 | 2014-07-03 | Teco-Westinghouse Motor Company | Assemblies and Methods for Cooling Electric Machines |
CN208862646U (zh) * | 2018-08-28 | 2019-05-14 | 湖北同发机电有限公司 | 一种高散热速率的定子结构 |
Also Published As
Publication number | Publication date |
---|---|
DE102021115033A1 (de) | 2022-12-15 |
CN117356015A (zh) | 2024-01-05 |
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