DE102005048735A1 - Permanent magnet rotor for e.g. electrical synchronous machine, has adhesive film formed between permanent magnets and yoke, where adhesive film from symmetric axis of magnets is formed in circumferential direction with increased thickness - Google Patents
Permanent magnet rotor for e.g. electrical synchronous machine, has adhesive film formed between permanent magnets and yoke, where adhesive film from symmetric axis of magnets is formed in circumferential direction with increased thickness Download PDFInfo
- Publication number
- DE102005048735A1 DE102005048735A1 DE102005048735A DE102005048735A DE102005048735A1 DE 102005048735 A1 DE102005048735 A1 DE 102005048735A1 DE 102005048735 A DE102005048735 A DE 102005048735A DE 102005048735 A DE102005048735 A DE 102005048735A DE 102005048735 A1 DE102005048735 A1 DE 102005048735A1
- Authority
- DE
- Germany
- Prior art keywords
- yoke
- adhesive film
- permanent magnet
- permanent magnets
- circumferential direction
- 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- Withdrawn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
- 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
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
Die Erfindung betrifft einen Rotor für eine permanentmagneterregte elektrische Maschine in Innenläuferbauart gemäß dem Oberbegriff des Patentanspruchs 1.The The invention relates to a rotor for a permanent magnet electric machine in internal rotor design according to the generic term of claim 1
Permanentmagneterregte Synchronmaschinen sind aus zahlreichen Anwendungen unter Ausnutzung der generatorischen oder motorischen Betriebsweise allgemein bekannt. Bei motorischem Betrieb tritt bei einem Motor in Innenläuferbauart das Magnetfeld der an der Außenumfangsfläche des Rotors angeordneten Mehrzahl von Permanentmagneten mit einem im Stator erzeugten Magnetfeld in Wechselwirkung. Dabei wird auf den Rotor ein Drehmoment ausgeübt, was diesen rotatorisch beschleunigt und synchron zum Statormagnetfeld antreibt.Permanent magnet Synchronous machines are taking advantage of numerous applications the generator or motor operation generally known. In motorized operation occurs in an internal-rotor motor the magnetic field at the outer peripheral surface of the Rotor arranged plurality of permanent magnets with an im Stator interacting magnetic field generated. It is on the Rotor exerted a torque, which accelerates this rotationally and synchronously to the stator magnetic field drives.
Die Permanentmagnete sind bei hohen Rotordrehzahlen außerordentlichen Belastungen ausgesetzt, was aufgrund der wirkenden Fliehkräfte und infolge der Sprödigkeit gebräuchlicher Magnetwerkstoffe, bspw. NdFeB, einerseits zu Bruchschäden und andererseits bei elektrischen Innenläufermaschinen zum Herauslösen der Permanentmagnetpole aus deren Halterungsstruktur am Rotor führen kann.The Permanent magnets are extraordinary at high rotor speeds Exposed to stress, which due to the centrifugal forces and as a result the brittleness common Magnetic materials, eg. NdFeB, on the one hand to breakage damage and on the other hand, in electrical internal rotor machines for dissolving the Permanent magnetic poles can lead from the support structure on the rotor.
Das erzielbare Drehmoment einer elektrischen Maschine hängt wesentlich von der Größe des radialen Luftspalts zwischen den am Rotor angeordneten Permanentmagnetpolen und den Statorpolen ab, wobei dieser dazu möglichst klein dimensioniert werden sollte. Der konstruktiven Ausgestaltung der Magnet-Halterungsstruktur kommt somit hinsichtlich Betriebssicherheit und Effizienz einer derartigen Maschine eine hohe Bedeutung zu.The recoverable torque of an electric machine depends significantly on the size of the radial Air gap between the arranged on the rotor permanent magnet poles and the stator poles, which are dimensioned as small as possible should. The structural design of the magnetic support structure comes thus in terms of reliability and efficiency of such Machine is very important too.
Die
Bei einer solchen Befestigung der Magnete besteht das Problem, dass sich dennoch bei hohen Drehzahlen und/oder Temperaturwechselbelastungen Permanentmagnete von ihrer Harz-Unterlage ablösen können.at such a fastening of the magnets is the problem that Nevertheless, at high speeds and / or thermal cycling Permanent magnets from their resin pad can replace.
Die Aufgabe der Erfindung liegt ausgehend vom Stand der Technik darin, einen Rotor für eine permanenterregte elektrische Maschine bereitzustellen, an dem die Permanentmagnete betriebssicherer befestigt sind.The The object of the invention is based on the state of the art in that a rotor for to provide a permanent magnet electric machine on which the permanent magnets are attached more reliable.
Diese Aufgabe wird bei einem gattungsgemäßen Permanentmagnet-Rotor durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.These Task is by a generic permanent magnet rotor through solved specified in the characterizing part of claim 1 features. advantageous Further developments and refinements of the invention are specified in the subclaims.
Die Erfinder haben bei Temperaturwechseltests ohne Fliehkrafteinwirkung im Betriebstemperaturbereich von ca. –40°C –+ 160°C festgestellt, dass sich einzelne Per manentmagnete von deren Jochunterlage am Rotor gelöst haben. Daraus wurde abgeleitet, dass die thermischen Ausdehnungseigenschaften des aus Elektroblech gefertigten Jochs und der Permanentmagnete sowie die thermomechanischen Eigenschaften des Klebemittels die Haftung der Permanentmagnete auf deren Jochunterlage entscheidend beeinflussen. So weisen beispielsweise NdFeB-Magnete einen negativen thermischen Ausdehnungskoeffizienten αT = –1 × 10–6 K–1 und Elektroblech einen positiven thermischen Ausdehnungskoeffizienten αT = +12 × 10–6 K–1 auf. Das Einkleben der Permanentmagnete mittels eines wärmeaushärtbaren synthetischen Harzes erfolgt üblicherweise bei Temperaturen von größer 100°C. Daraus ergeben sich bereits bei Umgebungstemperatur und bei Temperaturwechselbelastungen beim Betreiben eines Rotors starke Zug-, Druck- und Scherspannungen, die eine wesentliche Ursache für das Ablösen der Permanentmagnete darstellen.The inventors have found in temperature cycling tests without centrifugal force in the operating temperature range of about -40 ° C - + 160 ° C that individual per manentmagnete have detached from the yoke support on the rotor. From this it was derived that the thermal expansion properties of the yoke made of electrical sheet metal and of the permanent magnets and the thermomechanical properties of the adhesive decisively influence the adhesion of the permanent magnets to their yoke underlay. For example, NdFeB magnets have a negative coefficient of thermal expansion α T = -1 × 10 -6 K -1, and electrical steel has a positive thermal expansion coefficient α T = + 12 × 10 -6 K -1 . The bonding of the permanent magnets by means of a thermosetting synthetic resin is usually carried out at temperatures greater than 100 ° C. This results in strong tensile, compressive and shear stresses already at ambient temperature and at thermal cycling when operating a rotor, which represent a significant cause for the detachment of the permanent magnets.
Von dieser grundlegenden Erkenntnis ausgehend, schlägt die Erfindung einen Permanentmagnet-Rotor der eingangs genannten Art vor, bei welchem der in Wesentlichen in Umfangsrichtung verlaufende Klebemittelfilm von einer Symmetrieebene eines Permanentmagneten ausgehend in Umfangsrichtung mit einer ansteigenden Dicke ausgebildet ist. Da ein Permanentmagnet mit einem bspw. rechteckigen oder trapezförmigen Querschnitt in Umfangsrichtung beidseitig von benachbarten Haltevorsprüngen des Jochs eingefasst ist, bleibt der Mittenbereich des unter dem Magneten befindlichen Klebemittelfilmes in Näherung in Umfangsrichtung frei von thermomechanisch induzierten Spannungen, wohingegen die Verspannung der Klebemittelschicht in Richtung der beidseitigen Endbereichen des Magneten stetig zunimmt. Diese Scherspannungen können durch eine mit steigender Verspannung wachsende Dicke des Klebemittelspaltes vom Joch in Richtung eines Permanentmagneten aufgefangen werden, ohne dass es zu einem Aufreißen der Klebemittelschicht kommt. Die gemeinsame Kontaktfläche von Permanentmagnet und Klebemittel wird durch die erfindungsgemäße Lösung deutlich von Verspannungen entlastet.Based on this basic knowledge, the invention proposes a permanent magnet rotor of the type mentioned, in which the substantially circumferentially extending adhesive film is formed from a plane of symmetry of a permanent magnet in the circumferential direction with an increasing thickness. Since a permanent magnet with a rectangular or trapezoidal cross-section in the circumferential direction is enclosed on both sides by adjacent holding projections of the yoke, the center region of the adhesive film below the magnet remains approximately free in the circumferential direction of thermomechanically induced stresses, whereas the clamping of the adhesive layer in FIG Direction of the two-sided end portions of the magnet steadily increases. These shear stresses can be absorbed by a growing with increasing strain thickness of the adhesive gap from the yoke in the direction of a permanent magnet, without causing tearing of the adhesive layer. The common contact surface of the permanent magnet and adhesive is significantly relieved of tension by the inventive solution.
Gemäß Anspruch 2 sind in vorteilhafter Weise zwischen den Permanentmagneten und den Haltevorsprüngen Klebemittelfilme mit einer nach radial außen abnehmenden Dicke ausgebildet. Auf diese Weise wird zwischen den Haltevorsprüngen und den dazu benachbarten Seitenflächen der Permanentmagnete ein Klebemittelkeil erzeugt, der den dort vorhandenen Zwischenraum vollständig ausfüllt und einen Permanentmagnet bei Fliehkrafteinwirkung sicher an dessen Position verklemmt.According to claim 2 are advantageously between the permanent magnets and the retaining projections Adhesive films formed with a decreasing radially outward thickness. In this way, between the retaining projections and the adjacent thereto faces the permanent magnets generates an adhesive wedge, the existing there Gap completely fills and a permanent magnet at centrifugal force safely at the Position jammed.
Es ist gemäß Anspruch 3 vorteilhaft, wenn die Haltevorsprünge zur zumindest mittelbaren Fixierung der Permanentmagnete in der Lateralebene des Jochs elastisch verformbare Halteabschnitte aufweisen. Durch deren Verformung können zumindest teilweise am Rotor auftretende thermomechanische Belastungen aufgenommen werden, so dass der Stress in dem zwischen den Permanentmagneten und den Haltevorsprüngen befindlichen Klebemittelfilm zumindest teilweise reduziert wird und das Risiko einer Schädigung des Klebemittelfilms und/oder dessen Ablösung vom Joch bzw. den Permanentmagneten deutlich reduziert wird.It is according to claim 3 advantageous if the retaining projections for at least indirect Fixation of the permanent magnets in the lateral plane of the yoke elastic have deformable holding portions. By their deformation can at least partially taken on the rotor thermo-mechanical loads recorded so that the stress in the between the permanent magnets and the retaining projections befindliches adhesive film is at least partially reduced and the risk of injury of the adhesive film and / or its detachment from the yoke or the permanent magnet clearly is reduced.
Im Folgenden wird die Erfindung beispielhaft anhand der beigefügten Figur erläutert. Diese zeigt ausschnittweise einen Bereich eines Permanentmagnet-Rotors im Radialschnitt mit einer an dessen Außenumfangsfläche ausgebildeten Struktur zur Aufnahme von Permanentmagneten.in the The invention will now be described by way of example with reference to the attached FIGURE explained. This section shows a portion of a permanent magnet rotor in radial section with a formed on the outer peripheral surface Structure for receiving permanent magnets.
In
der Figur ist ein Ausschnitt eines Permanentmagnet-Rotors
Jeder
Aufnahmeraum
Die
Permanentmagnete
Innerhalb
der Grundfläche
Der
Spalt
- 1010
- Rotorrotor
- 1212
- Blechpaketlaminated core
- 1515
- Haltevorsprungretaining projection
- 1616
- Aussparungrecess
- 1818
- Permanentmagnetpermanent magnet
- 2020
- GrundflächeFloor space
- 2121
- Vorsprüngeprojections
- 2222
- Halteabschnittholding section
- 23a, b23a, b
- KlebemittelfilmAdhesive film
- 26, 2826 28
- Parallelflächeparallel surface
- 3030
- Trapezschenkeltrapezoidal leg
- HH
- Höheheight
- BB
- Breitewidth
- NN
- magnetischer Nordpolmagnetic North Pole
- SS
- magnetischer Südpolmagnetic South Pole
- SESE
- Symmetrieebeneplane of symmetry
- α, βα, β
- Winkelangle
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005048735A DE102005048735A1 (en) | 2005-10-12 | 2005-10-12 | Permanent magnet rotor for e.g. electrical synchronous machine, has adhesive film formed between permanent magnets and yoke, where adhesive film from symmetric axis of magnets is formed in circumferential direction with increased thickness |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005048735A DE102005048735A1 (en) | 2005-10-12 | 2005-10-12 | Permanent magnet rotor for e.g. electrical synchronous machine, has adhesive film formed between permanent magnets and yoke, where adhesive film from symmetric axis of magnets is formed in circumferential direction with increased thickness |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102005048735A1 true DE102005048735A1 (en) | 2007-04-19 |
Family
ID=37896299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102005048735A Withdrawn DE102005048735A1 (en) | 2005-10-12 | 2005-10-12 | Permanent magnet rotor for e.g. electrical synchronous machine, has adhesive film formed between permanent magnets and yoke, where adhesive film from symmetric axis of magnets is formed in circumferential direction with increased thickness |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102005048735A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010053364A1 (en) * | 2010-12-03 | 2012-06-06 | C. & E. Fein Gmbh | Locking-torque-reduced permanent magnet motor |
DE102007027060B4 (en) * | 2007-06-12 | 2014-11-13 | Minebea Co., Ltd. | Permanent magnet motor with axially magnetized pull magnet |
CN105048673A (en) * | 2014-04-16 | 2015-11-11 | 日本电产三协株式会社 | Motor |
DE102018130777A1 (en) | 2018-12-04 | 2020-06-04 | Schaeffler Technologies AG & Co. KG | Rotor blade with spring-elastic magnetic retention element, permanent magnet rotor, electric motor and manufacturing process for permanent magnet rotor |
-
2005
- 2005-10-12 DE DE102005048735A patent/DE102005048735A1/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007027060B4 (en) * | 2007-06-12 | 2014-11-13 | Minebea Co., Ltd. | Permanent magnet motor with axially magnetized pull magnet |
DE102010053364A1 (en) * | 2010-12-03 | 2012-06-06 | C. & E. Fein Gmbh | Locking-torque-reduced permanent magnet motor |
CN105048673A (en) * | 2014-04-16 | 2015-11-11 | 日本电产三协株式会社 | Motor |
CN105048673B (en) * | 2014-04-16 | 2018-06-22 | 日本电产三协株式会社 | Motor |
DE102018130777A1 (en) | 2018-12-04 | 2020-06-04 | Schaeffler Technologies AG & Co. KG | Rotor blade with spring-elastic magnetic retention element, permanent magnet rotor, electric motor and manufacturing process for permanent magnet rotor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69834594T2 (en) | Runner for a motor or generator | |
EP1203436B1 (en) | Electric axial flow machine | |
DE102006049825B4 (en) | Arrangement for mounting permanent magnets on high-speed rotating rotors of electric machines | |
DE19951115A1 (en) | Electrical machine | |
DE102005042543A1 (en) | Permanent-magnet synchronous machine for slowly rotating wind power plant, has counterpart provided as fastening part at magnet wheel, which is formed from two disk-shaped units and aligned bars that run axially perpendicular | |
DE102008012628A1 (en) | Rotor of a rotating electrical machine and manufacturing method of such a rotor | |
DE102007063307A1 (en) | Assembly method for fitting a permanent magnet in a holding element | |
DE102012218351A1 (en) | Clamping means for mounting a permanent magnet in a rotor or stator | |
EP1166423B1 (en) | Multipole, permanent-magnet rotor for a rotating electrical machine and method for producing such a rotor | |
DE102009026287A1 (en) | Permanent magnetic rotor with protected and sunk arranged, tangentially oriented permanent magnet with radial orientation of the magnetic poles as an internal rotor design or external rotor design of rotating electrical machines and method for mounting these permanent magnet rotor | |
DE102005048735A1 (en) | Permanent magnet rotor for e.g. electrical synchronous machine, has adhesive film formed between permanent magnets and yoke, where adhesive film from symmetric axis of magnets is formed in circumferential direction with increased thickness | |
WO2011091791A2 (en) | Fastening element for fastening a magnet to a component of an electric machine, and an assembly and a component having such a fastening element | |
EP2999089B1 (en) | Reluctance rotor | |
DE102011002327A1 (en) | Permanent magnet rotor for use in electromotor, has pole gap anchors and magnetic circuit base body with adjustment and assembly aids and safety devices for connecting anchors and base body in distributed and angle-precise force-fit manner | |
DE2412307A1 (en) | PERMANENTLY EXCITED ELECTRIC MACHINE | |
EP3261224A2 (en) | Electric machine with a rotor and method for producing the electric machine | |
DE3003483A1 (en) | Fixing assembly mounting winding to stator - uses dovetail spacing teeth fitting into slots in stator packet | |
DE102021002130A1 (en) | Method for assembling a rotor of an electrical machine by means of twisted sheet metal layers, as well as a corresponding rotor | |
EP3503351B1 (en) | Permanent magnet rotor and permanent magnet generator and method for producing a permanent magnet rotor | |
DE102004061617A1 (en) | Rotor for permanent magnet excited electrical machine in inner armature design has magnet element which is held on its position exclusively by attachment on retaining surfaces of sheet metal packet | |
EP3208912A1 (en) | Rotor | |
DE102007027060B4 (en) | Permanent magnet motor with axially magnetized pull magnet | |
EP1750349B1 (en) | Fastening of permanent magnets onto a rotor | |
DE3016540A1 (en) | Rotary inductor for electrical machine - has permanent magnet rotors with magnets arranged radially with intermediate tapered pole pieces | |
EP2871752B1 (en) | Rotor of a rotational permanently excited synchronous motor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
R012 | Request for examination validly filed |
Effective date: 20120904 |
|
R016 | Response to examination communication | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |