WO2022242990A1 - Rotor sowie verfahren zum herstellen eines rotors - Google Patents
Rotor sowie verfahren zum herstellen eines rotors Download PDFInfo
- Publication number
- WO2022242990A1 WO2022242990A1 PCT/EP2022/061016 EP2022061016W WO2022242990A1 WO 2022242990 A1 WO2022242990 A1 WO 2022242990A1 EP 2022061016 W EP2022061016 W EP 2022061016W WO 2022242990 A1 WO2022242990 A1 WO 2022242990A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- segments
- potting
- slots
- casting
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000463 material Substances 0.000 claims abstract description 50
- 150000001875 compounds Chemical class 0.000 claims abstract description 35
- 239000004020 conductor Substances 0.000 claims abstract description 20
- 238000004382 potting Methods 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 20
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 230000006641 stabilisation Effects 0.000 claims abstract description 6
- 238000011105 stabilization Methods 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 31
- 230000003313 weakening effect Effects 0.000 claims description 20
- 238000004090 dissolution Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000007789 sealing Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
- H02K15/026—Wound cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/527—Fastening salient pole windings or connections thereto applicable to rotors only
Definitions
- the present invention relates to a rotor, in particular for an externally or current-excited synchronous machine, and a method for producing a rotor, in particular for an externally or current-excited synchronous machine.
- DE 10 2016 205 813 A1 proposes a method for producing a rotor, in which a laminated rotor core with the wound rotor windings is placed in a mold and overmoulded with plastic compound. It turned out that in reality there is a risk that the plastic mass will tear. This can take place during cooling but also, above all, during operation, at high and very high speeds. In particular, if the cracks occur in the area of the winding heads of the winding, this can lead to problems.
- a rotor in particular for a current-excited/separately-excited electrical machine, in particular a synchronous machine, comprises a rotor base body which has a large number of rotor teeth distributed around the circumference and rotor slots formed between them, the rotor teeth being lined with conductor material along the rotor slots and on the face side to form a Winding are wrapped, wherein the conductor material is surrounded by potting compound for mechanical stabilization, whereby a potted body is formed, wherein the potted body has segments on the end faces in extension of the rotor slots, and wherein in at least one of the segments the material cohesion of the Ver- casting compound is weakened or dissolved in a targeted manner, at least in certain areas or sections.
- the goal does not have to be to design a potting body in such a way that it does not have or form cracks or the like. Instead, it has proven to be advantageous to specifically provide areas in which cracks and the like are allowed. In this way, the areas in which cracks are to be prevented as far as possible can be protected. In other words, advantageously no more damage/cracks occur there.
- the critical areas are, in particular, the end-face areas of the cast body, which surround the end windings in the area or as an extension of the rotor teeth. In contrast, the end-face areas in the extension of the rotor slots, as well as the areas in the rotor slots, are not critical. It has been found that the cast body does not tear in the area of the rotor grooves.
- the basic rotor body is preferably a laminated rotor core, comprising a multiplicity of laminations which are packaged to form the laminated core.
- the rotor is in particular a rotor for a current-excited/separately-excited synchronous machine, with the invention not being restricted to precisely this type of motor.
- the electrical machine is preferably a drive or traction motor for a partially or fully electrically operated motor vehicle, such as in particular a motorcycle, a passenger car or a commercial vehicle.
- the casting compound is a duroplastic or a thermoplastic.
- the casting compound is preferably applied by means of injection molding or also by means of casting, such as (vacuum) pressure gelling.
- the potting body is expediently shaped in such a way that it at least largely completely encloses the rotor slots and the front-side areas of the rotor on which the winding overhangs are formed or wrapped. In particular, the potting body should cover the conductor material as completely as possible.
- the conductor material is in particular copper wire.
- the aim here is to prevent any cracks from reaching the winding, ie the copper wire.
- the cohesion of the material of the casting compound is weakened or dissolved in a targeted manner, at least in areas or sections, in the segments, ie in particular on both end faces of the rotor.
- the rotor has a structure in the area of the at least one segment or in the area of the segments, which is designed to bring about or produce the weakening or dissolution of the material cohesion.
- the rotor is expediently shaped accordingly in sections or has components which are shaped in such a way that the material weakening or dissolution can be produced in the casting compound.
- the weakening or dissolving of the material is in the form of a crack that extends essentially radially.
- the structure comprises at least one edge, a corner and/or a radius which is directed radially inwards and/or outwards.
- the structure is therefore in particular a structural/technical design of the rotor in the area of the segments.
- the actual configuration is to be selected on a case-by-case basis.
- the structure is formed, for example, on a slot closing wedge, also called a slot cover, with the slot closing wedge or the slot cover extending axially into the at least one segment or into the segments protrudes.
- the slot closing wedge or the slot cover is designed in such a way that it can produce the material weakening or dissolving on the front side in extension of the rotor slots.
- the slot closing wedge or the slot cover has a structure directed radially inward for this purpose, in particular a sharp edge or tip or a correspondingly small radius.
- the basic rotor body is injection-moulded or encapsulated in order to form a casing, in particular with plastic, and the structure is formed on the casing.
- the sheathing is expediently provided for arranging and in particular also guiding the conductor elements or the conductor material, in particular the copper wires.
- a structure for weakening or dissolving the material can preferably be created or formed directly via the casing.
- the casing has a correspondingly small radius, a tip or a corner, which is oriented radially outwards, such that the material weakening or dissolution can be induced in the area of the segment or segments.
- the potting body is made so thin in the area of the at least one segment or in the area of the segments, at least in sections or areas, that a weakening of the material is formed, in particular in the form of a predetermined breaking point.
- the cast body is designed to be correspondingly thin, at least in regions or sections.
- the predetermined breaking point is formed indirectly via a cover element arranged on the end face of the rotor. Such cover elements are preferably arranged at both ends of the basic rotor body.
- the composite body can be made so thin in the desired segments that the corresponding area tears, for example as soon as the casting compound cools down or during operation, in particular during commissioning, the rotor.
- cover elements are typically already arranged on the rotor or on the basic rotor body before the potting body is produced. Such cover elements can also be designed in such a way that the casting compound penetrates through them.
- a material weakening can be produced in the potting body via the structure or by means of corresponding structures.
- the potting body already has the material weakening (or several weakenings) as such.
- a weakening of the material is introduced mechanically into the casting compound or into the casting body, for example in the form of a notch.
- a method for producing a rotor in particular for a current-excited/separately excited electrical machine, in particular a synchronous machine, comprises the steps:
- a basic rotor body comprising a plurality of rotor teeth arranged circumferentially distributed and rotor grooves formed therebetween;
- the cohesion of the material is expediently broken by the targeted introduction of a structure which causes the sealing compound to tear.
- the rotor is expediently shaped or designed in the region of the segment or segments in such a way that the sealing compound can be ruptured, wherein, according to preferred embodiments, correspondingly designed edges, radii or corners are provided here in particular. It is crucial that the structure or structures are introduced in a targeted manner in such a way that any cracks do not appear accidentally, but explicitly in the areas provided for them. If the cracks appear in the areas provided for them, it can be assumed that no cracks (any longer) will appear in the other areas.
- a material weakening is introduced into the casting compound itself, for example in the form of a regional wall thickness reduction or in the form of a notch. This can be introduced mechanically and/or formed when the casting compound is produced.
- the tearing or the material separation/dissolution occurs when the casting compound cools, for example due to thermally induced stresses, expediently also during start-up or during operation.
- the temperature and/or speed loading is such that cracking is induced.
- the cracks are produced when the casting compound cools down from the curing temperature of the casting compound to room temperature.
- the curing temperature here is around 180 to 200 °C, in particular at 190 °C.
- Fig. 3 another embodiment of a rotor with a cover element shown partially ge cut.
- Fig. 1 shows a rotor 10 viewed along a rotor axis R .
- the rotor 10 it extends, so to speak, into the plane of the drawing.
- the rotor 10 has six rotor teeth 12 with rotor slots 14 formed between them.
- the rotor teeth 12 are wrapped with conductive material 20, such as copper wire.
- An arrangement as outlined here is expediently sprayed or cast around with casting compound, with the casting compound filling both the rotor slots 14 and also covers or envelops the conductor material 20 on the front side.
- the casting compound or the casting body formed by it is not shown here. It is important that the casting compound in the area of the winding overhangs and in the extension of the rotor teeth 12 does not tear as far as possible.
- This area is outlined here as the critical area 18 . For reasons of clarity, only one such area has been singled out/outlined. In the present case, there is such a critical area on each of the rotor teeth 12 . It has been found that a material weakening or dissolution, in particular one or more cracks in areas in the extension of the rotor slots 12, referred to here as segment or segments 30, can result in critical areas 18 having no cracks. Thus, by allowing cracks in the segments 30, cracks in the critical areas 18 can advantageously be avoided.
- the material weaknesses or cracks 32 are shown here as a jagged line. The material weaknesses or cracks expediently extend radially or radially in the respective segments 30.
- a casing 22 is outlined with the reference number 22, which casing expediently encases or encases a basic rotor body.
- the conductor material 20 is expediently in contact with the casing.
- FIG. 2 now shows a detailed view of a rotor, wherein two rotor teeth with a rotor groove 14 formed between them can be seen.
- Reference R denotes a rotor axis
- reference 22 denotes a casing of a rotor base body.
- the rotor slot 14 is delimited on the outside by a slot cover or slot closing wedge 40 .
- a structure 50 in the form of an edge oriented radially inwards is expediently formed on this. This is designed and provided in order to produce a material weakening or dissolution in a targeted manner in the area of a segment 30 .
- the casing 22, as outlined here, can also have a correspondingly designed edge, which in the present case is correspondingly directed radially outwards. Structures or structural/geometric features of this type allow the material cohesion of the casting compound to be dissolved in a targeted manner or in sections in segment 30 or in the region of a segment 30. The material cohesion can be broken as soon as the casting compound cools, due to the stresses that occur and/or or also during operation or in particular when starting up the rotor.
- the weakening of the material is expediently formed as an extension of the rotor slots 14, that is to say in each case on the end face of the basic rotor body, in particular in the region of the end windings.
- the slot closing wedge protrudes 40 expediently corresponding to the basic rotor body in both directions. The actual configuration must be selected on a case-by-case basis.
- FIG. 3 shows a further embodiment of a rotor 10, a cover element 60 being arranged here on the front side of the basic rotor body.
- a predetermined breaking point 52 is produced in a targeted manner via a casing 22 and the cover element 60 .
- the potting body is expediently made so thin in the region of reference number 52 due to the design of the casing 22 and/or the design of the cover element 60 that the potting compound tears there.
- the background is that this expediently causes a crack to form in the radial direction in the area of segment 30 . It is easy to see that a crack that develops here and propagates axially does not hit the winding. If a crack were to form on the end face in the region of the rotor teeth 12, it would hit the winding if it propagated in the axial direction, which must be avoided at all costs.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280021076.5A CN116982247A (zh) | 2021-05-21 | 2022-04-26 | 转子以及用于制造转子的方法 |
US18/282,578 US20240186872A1 (en) | 2021-05-21 | 2022-04-26 | Rotor and Method for Producing a Rotor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021113309.2A DE102021113309A1 (de) | 2021-05-21 | 2021-05-21 | Rotor sowie Verfahren zum Herstellen eines Rotors |
DE102021113309.2 | 2021-05-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022242990A1 true WO2022242990A1 (de) | 2022-11-24 |
Family
ID=81841789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/061016 WO2022242990A1 (de) | 2021-05-21 | 2022-04-26 | Rotor sowie verfahren zum herstellen eines rotors |
Country Status (4)
Country | Link |
---|---|
US (1) | US20240186872A1 (de) |
CN (1) | CN116982247A (de) |
DE (1) | DE102021113309A1 (de) |
WO (1) | WO2022242990A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011121793A1 (de) * | 2011-12-21 | 2013-06-27 | Sew-Eurodrive Gmbh & Co. Kg | Elektromotor |
EP2662956A1 (de) * | 2012-05-09 | 2013-11-13 | ABB Research Ltd. | Nutverschlussanordnung und Verfahren zum Fixieren von Wicklungsstäben in Nuten elektrischer Maschinen |
DE102016205813A1 (de) | 2016-04-07 | 2017-10-12 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Kunststoffumspritzung von Rotorwicklungen einer elektrischen Maschine |
DE102017223519B3 (de) * | 2017-12-21 | 2018-10-11 | Bühler Motor GmbH | Stator eines dreiphasigen elektronisch kommutierten Gleichstrommotors |
DE102018204395A1 (de) * | 2018-03-22 | 2019-09-26 | Robert Bosch Gmbh | Wickelkörper für einen elektrischen Antrieb |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017222610A1 (de) | 2017-12-13 | 2019-06-13 | Bayerische Motoren Werke Aktiengesellschaft | Rotor sowie Verfahren zum Herstellen eines Rotors |
-
2021
- 2021-05-21 DE DE102021113309.2A patent/DE102021113309A1/de active Pending
-
2022
- 2022-04-26 US US18/282,578 patent/US20240186872A1/en active Pending
- 2022-04-26 CN CN202280021076.5A patent/CN116982247A/zh active Pending
- 2022-04-26 WO PCT/EP2022/061016 patent/WO2022242990A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011121793A1 (de) * | 2011-12-21 | 2013-06-27 | Sew-Eurodrive Gmbh & Co. Kg | Elektromotor |
EP2662956A1 (de) * | 2012-05-09 | 2013-11-13 | ABB Research Ltd. | Nutverschlussanordnung und Verfahren zum Fixieren von Wicklungsstäben in Nuten elektrischer Maschinen |
DE102016205813A1 (de) | 2016-04-07 | 2017-10-12 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Kunststoffumspritzung von Rotorwicklungen einer elektrischen Maschine |
DE102017223519B3 (de) * | 2017-12-21 | 2018-10-11 | Bühler Motor GmbH | Stator eines dreiphasigen elektronisch kommutierten Gleichstrommotors |
DE102018204395A1 (de) * | 2018-03-22 | 2019-09-26 | Robert Bosch Gmbh | Wickelkörper für einen elektrischen Antrieb |
Also Published As
Publication number | Publication date |
---|---|
DE102021113309A1 (de) | 2022-11-24 |
CN116982247A (zh) | 2023-10-31 |
US20240186872A1 (en) | 2024-06-06 |
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