WO2020151870A1 - Rotor pour un moteur électrique - Google Patents

Rotor pour un moteur électrique Download PDF

Info

Publication number
WO2020151870A1
WO2020151870A1 PCT/EP2019/084597 EP2019084597W WO2020151870A1 WO 2020151870 A1 WO2020151870 A1 WO 2020151870A1 EP 2019084597 W EP2019084597 W EP 2019084597W WO 2020151870 A1 WO2020151870 A1 WO 2020151870A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
short
rotor shaft
axial
circuit
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.)
Ceased
Application number
PCT/EP2019/084597
Other languages
German (de)
English (en)
Inventor
Korbinian WEBER
Viktor SZABÓ
Balazs LORINCZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Audi AG
Audi Hungaria Kft
Original Assignee
Audi AG
Audi Hungaria Kft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Audi AG, Audi Hungaria Kft filed Critical Audi AG
Publication of WO2020151870A1 publication Critical patent/WO2020151870A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the invention relates to a rotor for an electric motor.
  • the rotor has a rotor shaft that defines an axial direction, a laminated core which is penetrated by the rotor shaft and pressed onto the rotor shaft and which comprises a plurality of laminations arranged in a mutual axial arrangement, and a short-circuit cage which has two short-circuit rings resting on the axial end faces of the laminated core and a plurality of short-circuit bars which extend in the axial direction and connect the short-circuit rings and which pass through the laminated core at a distance from the rotor shaft.
  • the invention further relates to an electric motor and an electric vehicle.
  • Rotors of the type described in the introduction are known in various configurations and are used to form an electric motor in the form of an asynchronous three-phase machine.
  • the laminated core and the short-circuit cage together form a so-called rotor core of the rotor.
  • Electric motors are installed in electric vehicles, such as hybrid vehicles (Hybrid Electric Vehicles, HEV), plug-in hybrid vehicles (Plugin Hybrid Electric Vehicles) and pure electric vehicles (Battery Electric Vehicles, BEV) as drive units.
  • HEV Hybrid Electric Vehicles
  • HEV plug-in hybrid vehicles
  • BEV Battery Electric Vehicles
  • the rotor which is also referred to as a squirrel-cage rotor or squirrel-cage rotor, is rotatably mounted in a stator which corresponds to the rotor and which has a plurality of Includes coil windings.
  • the rotor follows a rotating magnetic field generated by the plurality of coil windings which are appropriately energized.
  • the voltage induced in the coil windings follows the rotating rotor.
  • One way to form a rotor core i. H. Assembling a laminated core with a short-circuit rotor consists in casting the short-circuit rods and the short-circuit rings in one piece onto the laminated core.
  • the rotor comprises a laminated core with a plurality of laminations arranged in a mutual arrangement and a short-circuit cage cast onto the laminated core.
  • the short-circuit cage comprises a short-circuit ring arranged on an axial end face of the laminated core and a plurality of short-circuit bars connected to the short-circuit ring, which pass through eccentric passages of the plurality of plates which are aligned with one another.
  • At least one end-side plate has a passage widened in relation to axially inner plates in order to create a stepped transition area between the short-circuit ring and the short-circuit bars, as a result of which local voltage increases at higher speeds of the electric motor are avoided.
  • the short-circuit cage can also be assembled from separate short-circuit rings and short-circuit bars if the short-circuit bars are inserted into axial passages of the laminated core.
  • DE 20 2013 005 050 A1 discloses a rotor for an electric motor.
  • the rotor comprises a rotor shaft, a laminated core with a plurality of sheets arranged in alternating arrangement and pressed onto the rotor shaft, and a short-circuit cage with two short-circuit rings resting on axially end-facing sheets and a plurality of short-circuit bars connecting the short-circuit rings, which pass through the laminated core.
  • Each short-circuit ring comprises a plurality of in an axial system arranged washers, which are also at least partially penetrated by the short-circuit bars.
  • Radial bevels are formed in the radially outer transition areas between the ring disks, which extend to the short-circuit bars and permit firm and electrically conductive joining of the short-circuit bars and the ring disks, for example by local melting or by means of a hard solder.
  • the short-circuit rings of the short-circuit cage can also have mechanical functions in addition to their electrical function.
  • DE 74 39 369 U discloses a rotor with an additional mechanical function of the short-circuit rings.
  • the rotor comprises a rotor shaft and a laminated core which is penetrated by the rotor shaft and which is pressed onto the rotor shaft.
  • the rotor comprises a short-circuit ring, which is arranged on an axial end face of the laminated core and is in axial contact with the laminated core, and a ceramic bearing ring penetrated by the rotor shaft with play.
  • the bearing ring has an annular groove formed in a radially outer circumferential surface of the bearing ring, in which an inward-pointing radial projection of the short-circuit ring corresponding to the annular groove engages in order to axially fix the bearing ring.
  • the laminated core and with it the short-circuit cage are subjected to a strong centrifugal force during operation of the rotor at a high rotational speed.
  • partial disengagement e.g. H. Loosening
  • the interference fit between the rotor shaft and the plates come d. H. central passages of the sheets expand during operation.
  • the object of the invention is therefore to provide an improved rotor, the rotor core of which has high dimensional stability under normal operating conditions.
  • An object of the invention is a rotor for an electric motor, with a rotor shaft defining an axial direction, a laminated core which is penetrated by the rotor shaft and pressed onto the rotor shaft and which comprises a plurality of laminations arranged in a mutual axial arrangement, and a short-circuit cage which connects two Axial end faces of the laminated core includes short-circuit rings and a plurality of short-circuit bars which extend in the axial direction and connect the short-circuit rings and which pass through the laminated core at a distance from the rotor shaft.
  • the rotor can be used to form an asynchronous three-phase machine, resulting in many practical applications for the invention.
  • the rotor according to the invention comprises means which are designed to prevent axially outer sheets of the laminated core from moving in the axial direction due to operation. As a result of operational heating and due to a centrifugal force acting on the sheets during operation, the sheets of the sheet stack expand with the release of the press fit.
  • the centrifugal force acting on the short-circuit rings applies a torque to the short-circuit rings around a radially outer connection region of the short-circuit rings with the short-circuit bars. Due to the torque, the short-circuit rings deform and swivel around the connection area, taking the axially outer sheets of the laminated core with them. In other words, the axially outer sheets bend in such a way that areas remove the outer sheets from the inner sheets of the laminated core the more axially the closer the areas are to the rotor shaft.
  • the rotor After the rotor has been operated, the sheets cool down. As a result, their operational expansion will at least partially recede. However, due to the press fit provided, the outer sheets are prevented from returning to their original axial position. This corresponds to an operational hike in the axial direction.
  • the rotor is provided with means which counteract the migration of axially outer sheets of the sheet stack. The migration of the axially outer sheets results in an irreversible deformation of the rotor core.
  • the means comprise a clearance fit, which is formed between an end plate and the rotor shaft.
  • the clearance fit allows the face plate to return fully to the original axial position after the electric motor has been operated.
  • the clearance fit corresponds to a radial gap between the sheet and the rotor shaft.
  • clearance fits are formed in each case between an end plate on each axial end side of the plate stack and the rotor shaft. This protects the rotor on both axial end faces from the undesired migration of metal sheets in the axial direction.
  • Clearances are particularly preferably formed between a plurality of adjacent sheets on an axial end face of the sheet stack and the rotor shaft. In this way, the number of sheets prevented from walking is increased if necessary.
  • the means advantageously comprise a clamping ring which is pressed onto the rotor shaft on an axial end face of the laminated core and is in axial contact with a front end sheet.
  • the clamping ring forms an axial lock for the face plate.
  • the means comprise two clamping rings, each of which is in axial contact with an end plate on opposite axial end faces. The two clamping rings protect the rotor on both axial end faces against the undesired migration of metal sheets in the axial direction.
  • Each clamping ring preferably overlaps the respective face plate in a radial direction. The overlap creates an axial contact area between the clamping ring and the face plate.
  • the means according to the invention may alternatively or additionally comprise any further means having the same effect, for example an annular groove formed in an outer surface of the rotor shaft and extending in a circumferential direction of the rotor shaft, with which at least one end-side plate is engaged.
  • the invention also relates to an electric motor with a rotor according to the invention.
  • the electric motor does not suffer any loss in efficiency or service life due to irreversible deformation of the rotor core.
  • Another object of the invention is an electric vehicle with an electric motor according to the invention. Thanks to the permanently more efficient and long-lasting electric motor, the electric vehicle itself has a consistently high level of efficiency and a correspondingly long service life, which improves the economy of the electric vehicle.
  • a major advantage of the rotor according to the invention is that the rotor core is dimensionally stable under normal operating conditions. This is achieved with a consistently high degree of efficiency and a longer service life of an electric motor and one formed with the rotor better economy of an electric vehicle equipped with such an electric motor.
  • Figure 1 is a schematic representation of a partial side view of a rotor according to an embodiment of the prior art
  • Figure 2 is a schematic illustration of a partial side view of the rotor shown in Figure 1 under the influence of operational forces;
  • FIG. 3 is a schematic illustration of a partial side view of the rotor shown in Figure 1 with a slight operational deformation
  • FIG. 4 shows a schematic illustration of a partial side view of the rotor shown in FIG. 1 with severe operational deformation
  • FIG. 5 shows a schematic illustration of a partial side view of a rotor according to a first embodiment of the invention
  • Figure 6 is a schematic representation of a partial side view of a rotor according to a second embodiment of the invention.
  • Figure 1 shows a schematic representation of a partial side view of a rotor 1 according to an embodiment of the prior art. The partial side view only represents an axial end region of the rotor 1 and, as in the subsequent FIGS. 2 to 6, mutatis mutandis strikes an opposite axial end region of the rotor 1 as well.
  • the rotor 1 can be used to form an electric motor, which in turn can be installed in an electric vehicle.
  • the rotor 1 comprises a rotor shaft 11 which is rotatable about an axis of rotation 2 and defines an axial direction and a laminated core 12 which is penetrated by the rotor shaft 11 and pressed onto the rotor shaft 11.
  • the laminated core 12 comprises a plurality of laminations 13 arranged in a mutual axial arrangement the rotor 1 has a short-circuit cage, which comprises two short-circuit rings 14 bearing on the axial end faces of the laminated core 13 and a plurality of short-circuit bars 15 which extend in the axial direction and connect the short-circuit rings 14.
  • the short-circuit bars 15 pass through the laminated core 12 at a distance from the rotor shaft 11.
  • FIG 2 shows a schematic representation of a partial side view of the rotor 1 shown in Figure 1 under the influence of operational forces.
  • operational forces 3 in particular a centrifugal force
  • the plates 13 form an expansion 4, as a result of which an interference fit between the plates 13 and the rotor shaft 11 is released.
  • the widening 4 is enlarged here and shown only in the relevant axial edge region of the laminated core 12.
  • Figure 3 shows a schematic representation of a partial side view of the rotor 1 shown in Figure 1 with a slight operational deformation.
  • the deformation is defined by a direction of deformation 6 of the sheets 13 and the short-circuit ring 14.
  • areas of the sheets 13 and the short-circuit ring 14 are deformed more, the closer they are to the rotor shaft 11.
  • an axial traveling direction 5 of a plurality of axially outer sheets 13 pointing away from the laminated core 12 and parallel to the axial direction is shown.
  • FIG. 4 shows a schematic side view of a partial side view of the rotor 1 shown in FIG. 1 with a severe operational condition irreversible deformation.
  • the rotor core formed by the laminated core 12 and the short-circuit cage 14, 15 has been completely detached from the rotor shaft 11 on its axial outer side.
  • FIG. 5 shows a schematic representation of a partial side view of a rotor 10 according to a first embodiment of the invention.
  • the rotor 10 has the same structure as the rotor 1 shown in FIGS. 1 to 4. It differs from this by means 16, which are designed to prevent axially outer sheets 13 of the sheet stack 12 from moving in the axial direction due to operation.
  • the funds include game fits 16, i.e. H. Radial gaps, which are formed on each axial face of the rotor core between the face plate 13 and a plurality of adjacent plates 13 on the one hand and the rotor shaft 11 on the other hand on an axial face of the laminated core 12.
  • FIG. 6 shows a schematic representation of a partial side view of a rotor 20 according to a second embodiment of the invention.
  • the rotor 20 has the same structure as the rotor 1 shown in FIGS. 1 to 4. It differs from this by means 21 which are designed to prevent axially outer sheets 13 of the sheet stack 12 from moving in the axial direction due to operation.
  • the means comprise two clamping rings 21, which are pressed onto the rotor shaft 11 on opposite axial end faces of the laminated core 12 and are each in axial contact with a front end sheet 13. Thanks to the pressing on, the clamping rings 21 are axially fixed in relation to the rotor shaft 11.
  • Each clamping ring 21 overlaps the respective face plate 13 in a radial direction, ie a radial thickness of the clamping rings 21 is selected such that the clamping rings 21 are not overcome by them even when the axially outer plates 13 expand (see FIG. 2) due to operation .
  • the means 16 shown in FIG. 5 and the means 21 shown in FIG. 6 can also be combined with one another in order to further reduce the risk of deformation of the rotor core.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un rotor pour un moteur électrique, comprenant un arbre de rotor définissant une direction axiale, un paquet de tôles traversé par l'arbre de rotor et pressé sur l'arbre de rotor, lequel comprend une multitude de tôles disposées en un appui axial mutuel, et une cage de court-circuit, laquelle comprend deux bagues de court-circuit reposant sur des côtés frontaux axiaux du paquet de tôles et une multitude de barres de court-circuit s'étendant dans la direction axiale et reliant les bagues de court-circuit, lesquelles traversent le paquet de tôles à distance de l'arbre de rotor. L'invention concerne également un moteur électrique et un véhicule électrique.
PCT/EP2019/084597 2019-01-24 2019-12-11 Rotor pour un moteur électrique Ceased WO2020151870A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019200865.8A DE102019200865A1 (de) 2019-01-24 2019-01-24 Rotor für einen Elektromotor
DE102019200865.8 2019-01-24

Publications (1)

Publication Number Publication Date
WO2020151870A1 true WO2020151870A1 (fr) 2020-07-30

Family

ID=69024245

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/084597 Ceased WO2020151870A1 (fr) 2019-01-24 2019-12-11 Rotor pour un moteur électrique

Country Status (2)

Country Link
DE (1) DE102019200865A1 (fr)
WO (1) WO2020151870A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230213023A1 (en) * 2021-12-28 2023-07-06 Amber Kinetics, Inc. Stacked Lamination Endplate

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7439369U (de) 1975-03-27 Halm R Rotor eines KurzschkiBläufermotors
DE8013602U1 (de) * 1980-05-21 1980-10-30 Allweiler Ag, 7760 Radolfzell Pumpenwelle
WO2010141572A1 (fr) * 2009-06-03 2010-12-09 Ecomotors International, Inc. Rotor de moteur électrique
DE202013005050U1 (de) 2013-06-04 2013-09-11 Bärbel Cybula Abdeckhaube für Bienenstock
DE102012214772A1 (de) 2012-08-20 2014-02-20 Robert Bosch Gmbh Rotor für eine elektrische Maschine
DE102015226156A1 (de) * 2015-12-21 2017-06-22 Bayerische Motoren Werke Aktiengesellschaft Rotor, Asynchronmaschine und Fahrzeug
DE102017115229A1 (de) * 2017-07-07 2019-01-10 Thyssenkrupp Ag Verfahren zur Herstellung eines Rotors für einen Elektromotor und mit diesem Verfahren hergestellter Rotor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04190669A (ja) * 1990-11-21 1992-07-09 Matsushita Electric Ind Co Ltd 誘導電動機のロータ構造
JP5678799B2 (ja) * 2011-05-23 2015-03-04 三菱電機株式会社 モータの回転子
DE102013005050A1 (de) 2013-03-22 2014-09-25 Wieland-Werke Ag Kurzschlussläufer und dessen Einzelteile sowie Verfahren zur Herstellung eines Kurzschlussläufers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7439369U (de) 1975-03-27 Halm R Rotor eines KurzschkiBläufermotors
DE8013602U1 (de) * 1980-05-21 1980-10-30 Allweiler Ag, 7760 Radolfzell Pumpenwelle
WO2010141572A1 (fr) * 2009-06-03 2010-12-09 Ecomotors International, Inc. Rotor de moteur électrique
DE102012214772A1 (de) 2012-08-20 2014-02-20 Robert Bosch Gmbh Rotor für eine elektrische Maschine
DE202013005050U1 (de) 2013-06-04 2013-09-11 Bärbel Cybula Abdeckhaube für Bienenstock
DE102015226156A1 (de) * 2015-12-21 2017-06-22 Bayerische Motoren Werke Aktiengesellschaft Rotor, Asynchronmaschine und Fahrzeug
DE102017115229A1 (de) * 2017-07-07 2019-01-10 Thyssenkrupp Ag Verfahren zur Herstellung eines Rotors für einen Elektromotor und mit diesem Verfahren hergestellter Rotor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230213023A1 (en) * 2021-12-28 2023-07-06 Amber Kinetics, Inc. Stacked Lamination Endplate
US12331729B2 (en) * 2021-12-28 2025-06-17 Amber Kinetics, Inc. Stacked lamination endplate

Also Published As

Publication number Publication date
DE102019200865A1 (de) 2020-07-30

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