EP3072222A2 - Composant de machine pour machine électrique - Google Patents

Composant de machine pour machine électrique

Info

Publication number
EP3072222A2
EP3072222A2 EP14750360.1A EP14750360A EP3072222A2 EP 3072222 A2 EP3072222 A2 EP 3072222A2 EP 14750360 A EP14750360 A EP 14750360A EP 3072222 A2 EP3072222 A2 EP 3072222A2
Authority
EP
European Patent Office
Prior art keywords
protective layer
machine component
magnetic
magnet
arrangement
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Withdrawn
Application number
EP14750360.1A
Other languages
German (de)
English (en)
Inventor
Ingo Immendoerfer
Erwin Franieck
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3072222A2 publication Critical patent/EP3072222A2/fr
Withdrawn legal-status Critical Current

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
    • 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
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent 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
    • H02K1/27—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
    • H02K1/2781—Magnets shaped to vary the mechanical air gap between the magnets and the stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
    • 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
    • H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator

Definitions

  • the present invention relates to a machine component for an electric machine and in particular a rotor for a brushless, electronically commutated and permanent-magnet electric machine.
  • a machine component for an electric machine and in particular a rotor for a brushless, electronically commutated and permanent-magnet electric machine.
  • Permanent magnets are arranged in the permanent-magnet rotor of electrical machines.
  • the magnetic exciter flux generated by these leads in interaction with a generated by energized coils of a stator of the electric machine stator magnetic flux on the one hand to a resulting magnetic field in the air gap of the electric machine and on the other hand to a coil current dependent movement of the rotor (in electromotive operation of the electric machine ) or to the generation of electric current due to movement of the rotor (in regenerative operation of the electrical see machine).
  • the permanent magnets of electrical machines are regularly designed as surface magnets, as blocks in the rotor yoke or as segment magnets with different geometries.
  • the permanent magnets may for example consist entirely of sintered ferrites or rare earths.
  • Also known is the formation of permanent magnets made of magnetic materials in which magnetic particles, in particular of ferrites or rare earths, are incorporated in a non-magnetic matrix material. An advantage of such magnetic materials is that they can easily be in almost any shape formable (in particular by injection molding), but at the same time are also easy to machine.
  • FIG. 1 shows a schematic representation of such an electrical machine.
  • This comprises a rotor with a rotor yoke 1 and a magnetic ring 2 surrounding the rotor yoke 1 and formed of four magnetic poles 3.
  • the electrical machine comprises a stator 4 surrounding the rotor. The cuts already mentioned in the areas of the pole gaps result because the outer sections 5 of the end faces of the magnetic poles 3 are designed to run parallel.
  • the individual magnetic poles 3 can be well fixed when a machining post-processing of those contact surfaces 6, with which the magnetic poles 3 contact the rotor yoke 1, takes place. Since the areas around the pole gaps in principle make no significant contribution to the magnetic flux increase, the reduced wall thickness due to the cuts of the magnetic ring 2 is not associated with a relevant loss of power of the electric machine. But it is also possible to fill the incisions with a non-magnetic material, if a smooth rotor surface to be formed (for example, to reduce friction losses).
  • a machine component in particular a rotor, for an electric machine, is provided with a magnet arrangement which comprises a plurality of magnetic elements (different polarity) arranged adjacent to each other in an arrangement direction, wherein the magnet elements are formed by shapes of at least one magnetic material, the wherein at least one of the magnetic elements has a varying thickness in the arrangement direction, wherein the magnet assembly is covered by a protective layer which fills a resulting from a smaller thickness of the magnet assembly recess.
  • a method of manufacturing a machine component for an electric machine wherein a magnet assembly having a plurality of magnetic members juxtaposed in an arrangement direction is formed by patterning a magnetic material comprising magnetic particles contained in a matrix material.
  • the magnetic elements are produced with a thickness varying in their arrangement direction.
  • the magnet assembly thus formed is covered with a protective layer which fills a resulting from the varying thickness of the magnet assembly recess.
  • the course of the magnetic flux density over the arrangement direction of the magnetic elements of the magnet assembly can be reproduced, changed and thus specifically the torque (in particular its course over the arrangement direction of the magnet assembly) in an electric motor or the course of the induced voltage in the stator be influenced by a generator.
  • the magnetic material may be, in particular, a plasticized magnetic material, the formation of the magnetic elements being particularly preferably by injection molding or a related process, such as e.g. Injection stamping can take place.
  • the matrix material may preferably be a (preferably paramagnetic) plastic, and more preferably a thermoplastic.
  • the protective layer covering the magnet arrangement (in particular of a paramagnetic material) may be provided. This can be especially true in the case of intended operation of the electric machine in a corrosive environment, e.g. when used as a fuel pump) and in particular when using rare earths (in particular from neodymium mixtures and / or samarium mixtures) as magnetic particles, in order to ensure protection of the magnetic elements. Furthermore, the protective layer compensates for the depressions caused by the varying thickness of the magnet arrangement, so that the unevenness of the surface of the machine component is reduced or filled.
  • the electric machine may in particular be a rotary machine, the machine component serving as a rotor which is rotatably mounted within a stator of the electric machine.
  • the magnet arrangement can then be designed in particular as a magnetic ring surrounding (preferably closed) a rotor yoke.
  • a linear machine or transverse machine is also the embodiment of the above electrical machine as a linear machine or transverse machine.
  • the arranging direction may correspond to a circumferential direction of the machine component or, in the case of a machine component provided for a transverse electric machine, the direction of a rectilinear arrangement of the magnetic elements.
  • the electric machine can be designed or used as an electric motor or generator.
  • it can furthermore be provided that the varying thickness of the magnetic elements results from the fact that the magnetic elements arranged in the arrangement direction have a smaller thickness at their edge regions relative to the adjacent magnetic elements.
  • This refinement of the machine component is based on the idea that the costs for the production of a machine component of an electrical machine can be reduced if the comparatively expensive magnetic material is saved or provided in a reduced extent at which it makes no significant contribution to Magnet flux increase and thus makes the performance of the electric machine.
  • the primary molding in particular with a plasticized material and particularly preferably by injection molding or a related method, such. Injection embossing takes place in which the magnetic material is introduced into a mold in the plasticized state (and under overpressure).
  • Another advantage of such a urformed and in particular integrally formed on the magnet assembly protective layer may lie in the fact that this largely fully contacted the side facing the protective layer of the magnetic ring and thus also fills the wells formed by the varying thickness of the magnetic elements. In the wells thus accumulates a relatively large amount of the material of the protective layer, which may have a positive effect on the production of the protective layer, in particular by injection molding or related methods. This is due to the fact that the accumulations of material the protective layer in the recesses delays a cooling of the material in the original molding, whereby a distribution of the material in the other portions of the protective layer can be supported. Furthermore, the surface of the protective layer facing away from the magnet arrangement can be designed to extend essentially in the direction of arrangement.
  • an injection point ie the point of the protective layer which is produced by the introduction of the material for the protective layer in the (injection-molded) form at injection points provided for it, is arranged in a section of the protective layer which is in Covering a portion with a relatively small magnet thickness, that is, a recess of the Magnetanord- tion is arranged.
  • at least one injection point is provided in all sections of the protective layer, which are arranged in overlap of a portion of the magnet arrangement with a relatively small thickness.
  • the protective layer By better distributing the material of the protective layer due to the accumulation of material in the recesses formed by the magnet assembly, it may be possible to form the protective layer in the other portions with a smaller thickness than would be possible with a substantially constant thickness magnet assembly.
  • This reduced thickness of the protective layer can lead to a reduced magnetic air gap height (this includes the thickness of the protective layer and the height of the actual air gap between the rotor and the stator) and thus an increase in the air gap induction.
  • This increase in the air gap induction can then be used to increase the performance of the electric machine or to an additional reduction of the magnetic material used at substantially the same performance of the electric machine.
  • a rotary or transverse electric motor comprising the above machine component as a rotor and at least one stator is provided.
  • Figure 1 is a cross-sectional view of an electrical machine; and Figure 2 is an electrical machine in a schematic sectional view. Description of embodiments
  • Fig. 2 shows a cross-sectional view of a rotary electric machine transversely to an axial direction in the form of an electric motor.
  • This comprises a rotor as a machine component in the form of an internal rotor, which is rotatably mounted within an only indicated cylindrical stator 4.
  • the rotor comprises a rotor yoke 1 and a rotor assembly 1 surrounding, with this rotatably connected magnet assembly 1 1 in the form of a magnetic ring 2.
  • the rotor yoke 1 forms in the embodiment shown at the same time a rotor shaft.
  • the magnetic ring 2 is composed of several, in the embodiment shown four magnetic elements 3, which are diametrically magnetized and frontally adjacent in the circumferential direction (corresponding to the arrangement direction of the magnetic elements 3 of the Magnetan angel 1) to each other.
  • the magnet ring 2 is thus formed in a closed manner. It is also possible to form the Magnetan angell 1 such that adjacent magnetic poles do not contact the front side in the circumferential direction.
  • the magnetic elements 3 of the magnet ring 2 are formed with a thickness varying in the circumferential direction, the thickness being measured in the radial direction with respect to a rotor axis.
  • the two circumferentially adjacent end portions 32 of each magnetic element 3 have a smaller thickness than the corresponding central portions 31 of the magnetic elements 3.
  • the adjacent end portions 32 of two magnetic elements 3 thus each form a recess 12 in the outer side surface of the Magnetic rings 2 off.
  • the magnet ring 2 is produced by injection molding a magnetic material comprising magnetic particles 8 embedded in a matrix material 9.
  • the magnetic material is introduced in plasticized form into an injection mold (not shown) where it hardens.
  • the magnetic elements 3 can be injection-molded separately or together.
  • the magnetization of the magnetic elements 3 can be done in the injection mold and in particular in the plasticized state of the magnetic material or subsequently. If the magnetic elements 3 are injection-molded together as a magnetic ring 2, then the injection molding of the magnetic ring 2 can also be done separately, so that it is pushed onto the rotor yoke 1 only after removal from the mold. But it is also possible to form the magnetic ring 2 to the rotor yoke 1.
  • the magnetic ring 2 is surrounded on the outside by a paramagnetic protective layer 10. This serves in particular to protect the magnetic ring 2 and in particular the magnetic particles 8 contained therein from a corrosive environment in which the electric motor is possibly operated.
  • the protective layer 10 is likewise produced by prototyping and in particular injection molding, with molding preferably being provided on the (largely) cured magnetic ring 2.
  • injection mold (not shown) for the protective layer 10
  • one or more Anspritzstellen are provided in those areas which are relatively centrally (seen in the circumferential direction) with respect to all of the magnetic ring 2 formed by depressions.
  • About the Anspritzstellen provided for the formation of the protective layer 10 material is introduced under pressure into the injection mold.
  • the protective layer 10 thus forms corresponding injection points 7 in the region of these injection points.
  • the material for the protective layer 10 which has been heated to plasticize, initially spreads in the depressions starting from the injection points 7 and then flows into those portions of the later protective layer 10 which cover the sections of the magnetic ring 2 with a relatively large thickness. Since a substantially cylindrical outer contour is provided for the protective layer 10, the thickness of the protective Layer 10 in these sections less than in the recesses of the magnetic ring 2 overlapping sections.
  • the described embodiment of the rotor makes it possible to produce a protective layer 10 which has a smaller thickness in the portions covering the magnet ring 2 with a relatively large thickness than in a conventional electric motor with a cylindrical outer surface of the magnet ring and thus with one substantially constant thickness of the protective layer (with an equal number of injection points) would be the case.
  • the air gap inductance behaves inversely proportional to the width of the magnetically active air gap ⁇ (sum of actual air gap (which also with something else) Air can be filled) and the thickness of the non-magnetic
  • This example is based on a width of the actual loss gap of 0.5 mm and a (constant) thickness of the protective layer with a cylindrical magnet ring of 0.5 mm, which in the case of the protective layer 10 of the rotor according to the invention in the sections with relatively small thickness is only 0, 3 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un composant de machine, en particulier un rotor, destiné à une machine électrique, comprenant un agencement d'aimants (11) comportant une pluralité d'éléments magnétiques (3) disposés les uns à côtés des autres dans une direction d'agencement, les éléments magnétiques (3) étant conçus par formage initial d'une matière magnétique qui comporte des particules magnétiques (8) contenues dans une matrice de matière (9), l'un au moins des éléments magnétiques (3) ayant une épaisseur qui varie dans la direction d'agencement, l'agencement d'aimants (11) étant recouvert par une couche protectrice (10) qui remplit une cavité résultant de l'épaisseur variable de l'agencement d'aimants.
EP14750360.1A 2013-11-21 2014-08-11 Composant de machine pour machine électrique Withdrawn EP3072222A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013223818.5A DE102013223818A1 (de) 2013-11-21 2013-11-21 Maschinenkomponente für eine elektrische Maschine
PCT/EP2014/067148 WO2015074774A2 (fr) 2013-11-21 2014-08-11 Composant de machine pour machine électrique

Publications (1)

Publication Number Publication Date
EP3072222A2 true EP3072222A2 (fr) 2016-09-28

Family

ID=51302714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14750360.1A Withdrawn EP3072222A2 (fr) 2013-11-21 2014-08-11 Composant de machine pour machine électrique

Country Status (4)

Country Link
EP (1) EP3072222A2 (fr)
CN (1) CN106030986A (fr)
DE (1) DE102013223818A1 (fr)
WO (1) WO2015074774A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116130201A (zh) * 2023-03-08 2023-05-16 成都银河磁体股份有限公司 一种环状磁体结构、环状磁体组件及电机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19805777A1 (de) * 1998-02-12 1999-08-26 Bosch Gmbh Robert Förderaggregat für Kraftstoff
JP3309844B2 (ja) * 2000-03-06 2002-07-29 松下電器産業株式会社 電動機ロータの製造方法
JP2005110480A (ja) * 2003-09-26 2005-04-21 Aisan Ind Co Ltd モータ用ロータおよびその製造方法
US20060127253A1 (en) * 2004-12-10 2006-06-15 Ekberg Andrew M Inner drive for magnetic drive pump
JP5199427B2 (ja) * 2011-08-25 2013-05-15 ファナック株式会社 織布を用いたリニアモータ用磁石板、該磁石板を備えたリニアモータ及び該磁石板の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN106030986A (zh) 2016-10-12
DE102013223818A1 (de) 2015-05-21
WO2015074774A3 (fr) 2016-03-10
WO2015074774A2 (fr) 2015-05-28

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