EP3857678A1 - Rotor eines elektromotors und elektromotor - Google Patents
Rotor eines elektromotors und elektromotorInfo
- Publication number
- EP3857678A1 EP3857678A1 EP19797641.8A EP19797641A EP3857678A1 EP 3857678 A1 EP3857678 A1 EP 3857678A1 EP 19797641 A EP19797641 A EP 19797641A EP 3857678 A1 EP3857678 A1 EP 3857678A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- permanent magnet
- axial
- rotor according
- press
- 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.)
- Pending
Links
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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- 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
-
- 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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
- H02K1/2733—Annular magnets
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
- H02K15/121—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines of cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the invention relates to a rotor of an electric motor and an electric motor with a corresponding rotor.
- a shaft-hub connection of the motor shaft to the magnet of the rotor cannot usually be achieved by a press connection, since the permanent magnet is made of a brittle magnetic material such as e.g. Ferrite or ceramic is formed.
- the invention has for its object to provide a rotor which is adapted such that the motor shaft can be attached to the permanent magnet via a press connection. This object is achieved by the combination of features according to claim 1.
- a rotor of an electric motor is proposed with a permanent magnet extending around an axis of rotation of the rotor, on which a plastic encapsulation is provided, which determines a shaft passage for attaching a motor shaft of the electric motor along the axis of rotation.
- a press bushing is arranged directly adjacent to the shaft passage formed by the plastic extrusion, into which the motor shaft can be pressed by a press connection and can be fixed to the rotor.
- the motor shaft is thus not directly attached to the permanent magnet or its plastic encapsulation on the rotor, but indirectly via the press bushing, which engages in the plastic encapsulation. This makes it possible to use the brittle permanent magnet as a compact.
- An advantageous embodiment of the rotor provides that the press bush and the permanent magnet are arranged at the same axial height along the axis of rotation and, seen in axial section, overlap at least partially, preferably completely.
- the radial forces acting on the press bush when pressing in the motor shaft are thus supported on the permanent magnet. Forces that could cause tilting between the press bush and the permanent magnet are thus eliminated.
- the permanent magnet has at least one axial recess on at least one of its two axial end faces, in which the plastic encapsulation positively engages.
- the permanent magnet preferably has at least one axial recess on both of its axial end faces, in which the plastic encapsulation engages in a form-fitting manner.
- the axial recess or the recesses provided on both sides are in one embodiment. te formed as a notch in the transition area from the axial end face to the radial inner surface of the permanent magnet. It is an advantageous embodiment of the force distribution that the recess or the recesses, seen in the radial section, have a spherical cap cross section. The plastic encapsulation thus intervenes at the critical edge at the transition to the axial passage in the permanent magnet and prevents a relative movement between the permanent magnet and the
- the plastic encapsulation also extends in an embodiment of the rotor in the axial direction beyond the axial end faces of the permanent magnet and forms at least one contact surface on at least one of the two axial end faces of the permanent magnet.
- the contact surface also prevents an axial relative movement in one direction between the permanent magnet and the plastic encapsulation, in particular when pressing the motor shaft, but also during operation of the rotor.
- the rotor is further characterized in one embodiment in that the plastic encapsulation has an axial stop against which the press bushing is positioned.
- the axial stop is preferably a recess of the inner diameter of the inner surface of the
- the permanent magnet is made of brittle, inelastic material, for example as a sintered ferrite magnet.
- the plastic encapsulation has partially elastic properties, so that the press bushing can be pressed into the plastic encapsulation to a certain extent in the radial direction. Depending on the interpretation of the Press connection between the motor shaft and press bushing can cause a certain radial expansion of the outer diameter of the press bushing into the
- Plastic encapsulation are permitted as long as the necessary tensile and compressive stresses in the plastic encapsulation are not exceeded.
- an embodiment of the rotor is advantageous in which the press bush has an axial length which corresponds to at least 50%, preferably at least 60%, of an axial length of the permanent magnet. Sufficient support between the press bush and the permanent magnet is thus guaranteed.
- the rotor is preferably rotationally symmetrical, the plastic encapsulation and / or the permanent magnet are preferably formed in one piece.
- the disclosure also includes an electric motor with a stator and a rotor described above, in which the motor shaft is fixed to the rotor by a press connection pressed into the press bushing.
- Figure 1 is a perspective sectional view of a ro tor invention.
- FIG. 2 is a side sectional view through an exemplary Elektromo gate with a rotor according to FIG. 1st
- FIG 1 an embodiment of a rotationally symmetrical rotor 1 according to the invention is shown in a perspective view.
- Figure 2 shows the rotor 1 of Figure 1 schematically in an installed in an electric motor 100 state.
- the ring-shaped permanent magnet 6, which extends around the axis of rotation of the rotor 1, has plastic extrusion coating 3 on its inner lateral surface, which determines the shaft passage 10 for the motor shaft 14 of the electric motor 100 shown in FIG.
- the press bushing 2 is positioned essentially centrally on the plastic extrusion 3, into which the motor shaft 14 is pressed for fastening to the rotor 1.
- the press bushing 2 can expand radially outward into the partially elastic plastic extrusion coating 3, the extent being restricted by the choice of the plastic material. Thereby thermal expansions e.g. taken into account by heating the bearing 29.
- the plastic encapsulation 3 has different internal diameters in the axial direction and forms a return jump or a step which serves as an axial stop 9 for arranging the press sleeve 2 at an axially fixed point. Furthermore, the press bushing 2 is overstretched on both sides in the axial direction by the permanent magnet 6, so that there is a complete overlap and radial forces always act between the press bushing 2 and the plastic encapsulation 3 and the permanent magnet 6.
- the one-piece plastic encapsulation 3 forms on the first axial side of the permanent magnet 6 an axially opposite the axial end face 16 vorste existing ring 11 which merges into a radial extension 4 which is flush with the end face 16 in an axial plane.
- the plastic encapsulation forms a radial projection 7, which divides the contact surface 8 on the axial end face 15 of the permanent magnet 6 and thus, for pressing in the motor shaft 14, the relative movement of the permanent magnet 6 with respect to the
- the one-piece circumferential axis of rotation permanent magnets 6 are formed on both axial end faces 15, 16 at the transition to the inner circumferential surface in each case as a circumferential notch recesses 5, in which the plastic encapsulation 3 positively engages.
- the cross sections of the notches are spherical-spherical, since this advantageously distributes the stresses.
- the radial extension 4 of the plastic encapsulation 3 extends over the radial length of the recess 5, on the opposite axial end face 15 the plastic encapsulation 3 then merges into the radial projection 7.
- the Ra dialvorsprung 7 is only axially provided on one side to save material.
- the rotor 1 is installed, for example, in the electric motor 100 according to FIG. 2.
- the motor shaft 14 is pressed onto the rotor 1 by a press connection into the press bush 2 and is mounted on the bearing 29.
- the electric motor 100 comprises a one-piece motor housing 22 with a housing cover 33, on the outside of which a plurality of cooling fins are formed for improved heat dissipation.
- the motor housing 22 forms in one piece a can 77 which extends axially into the interior of the motor housing 2.
- the motor section, in which the stator 66 and the motor electronics 55 fastened on the printed circuit board 114 are accommodated, lies between the inner wall of the motor housing 22 and the outer jacket of the containment shell 77.
- the containment shell 77 delimited sealing lies within the containment shell 77 of the shaft section in which the motor shaft 14 runs along its axis of rotation.
- the containment shell 77 extends in the axial direction essentially through the entire motor housing 22 up to the housing cover 33.
- the deepest section of the containment shell 77 seen in the axial direction is an off a thermally conductive material, in particular made of metal Kugella gertopf 28 arranged.
- the motor housing 22 with the containment shell 77 is injection molded from plastic in an injection molding process around the ball bearing pot 28, so that the split case 77 and the ball bearing pot 28 have the same shape or inner and outer contours and abut one another directly.
- the ball bearing cup 28 determines the bearing seat for the pressed-in ball bearing 29 in which the motor shaft 14 is mounted. Between the ball bearing 29 and the axial inner wall surface of the containment shell 77, a free space 113 is formed, into which the motor shaft 14 extends with its free end.
- a layer of a heat-conducting paste is provided in the gap 121, which layer can also be replaced by heat-conducting adhesive.
- a heat dissipation of the heat generated by the ball bearing 29 during operation takes place from the ball bearing 29 to the ball bearing pot 28, further to the gap pot 77 and in the axial direction via the thermal paste to the cooling element 101 of the housing cover 33 of the motor housing 22 the heat is released to the outside environment.
- the motor housing and in particular its housing cover 33 thus function as a heat sink.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019102366.1A DE102019102366A1 (de) | 2019-01-30 | 2019-01-30 | Rotor eines Elektromotors und Elektromotor |
| PCT/EP2019/079547 WO2020156695A1 (de) | 2019-01-30 | 2019-10-29 | Rotor eines elektromotors und elektromotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3857678A1 true EP3857678A1 (de) | 2021-08-04 |
Family
ID=68426442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19797641.8A Pending EP3857678A1 (de) | 2019-01-30 | 2019-10-29 | Rotor eines elektromotors und elektromotor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20220085675A1 (de) |
| EP (1) | EP3857678A1 (de) |
| KR (1) | KR20210120986A (de) |
| CN (1) | CN113169609A (de) |
| DE (1) | DE102019102366A1 (de) |
| WO (1) | WO2020156695A1 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016209174A1 (de) * | 2016-05-25 | 2017-11-30 | Continental Automotive Gmbh | Rotor und Verfahren zur Herstellung eines Rotors |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1880808U (de) * | 1963-07-24 | 1963-10-17 | Deutsche Edelstahlwerke Ag | Dauermagnetischer rotor. |
| DE3008430A1 (de) * | 1980-03-05 | 1981-09-10 | Robert Bosch Gmbh, 7000 Stuttgart | Elektrische maschine, insbesondere drehstromgenerator fuer kraftfahrzeuge |
| EP0308647A1 (de) * | 1987-08-26 | 1989-03-29 | Siemens Aktiengesellschaft | Verfahren zur Herstellung eines Festsitzes zwischen einer Rotorwelle und einem umspritzten Rotationskörper |
| DE59305082D1 (de) * | 1993-08-26 | 1997-02-20 | Siemens Ag | Welle mit darauf konzentrisch gehaltenem Magnetkörper |
| DE102007029738A1 (de) * | 2007-06-27 | 2009-01-08 | Robert Bosch Gmbh | Rotor für einen Elektromotor und Elektrowerkzeugmaschine mit einem Elektromotor und einem Rotor |
| DE102011081262B4 (de) * | 2011-08-19 | 2021-03-25 | Bühler Motor GmbH | Permanentmagnetrotor |
| KR101703891B1 (ko) * | 2014-06-13 | 2017-02-07 | 엘지이노텍 주식회사 | 모터 및 이를 포함하는 듀얼 클러치 트랜스미션 |
-
2019
- 2019-01-30 DE DE102019102366.1A patent/DE102019102366A1/de not_active Withdrawn
- 2019-10-29 EP EP19797641.8A patent/EP3857678A1/de active Pending
- 2019-10-29 KR KR1020217015555A patent/KR20210120986A/ko not_active Withdrawn
- 2019-10-29 CN CN201980077433.8A patent/CN113169609A/zh active Pending
- 2019-10-29 US US17/420,469 patent/US20220085675A1/en not_active Abandoned
- 2019-10-29 WO PCT/EP2019/079547 patent/WO2020156695A1/de not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016209174A1 (de) * | 2016-05-25 | 2017-11-30 | Continental Automotive Gmbh | Rotor und Verfahren zur Herstellung eines Rotors |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020156695A1 (de) | 2020-08-06 |
| CN113169609A (zh) | 2021-07-23 |
| DE102019102366A1 (de) | 2020-07-30 |
| KR20210120986A (ko) | 2021-10-07 |
| US20220085675A1 (en) | 2022-03-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
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| 17P | Request for examination filed |
Effective date: 20210428 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
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| 17Q | First examination report despatched |
Effective date: 20230310 |
|
| RIC1 | Information provided on ipc code assigned before grant |
Ipc: H02K 1/28 20060101AFI20251023BHEP Ipc: H02K 1/2733 20220101ALI20251023BHEP |
|
| RIC1 | Information provided on ipc code assigned before grant |
Ipc: H02K 1/28 20060101AFI20251027BHEP Ipc: H02K 1/2733 20220101ALI20251027BHEP Ipc: H02K 15/121 20250101ALI20251027BHEP |