EP2084805A2 - Stator de moteur électrique - Google Patents

Stator de moteur électrique

Info

Publication number
EP2084805A2
EP2084805A2 EP07821016A EP07821016A EP2084805A2 EP 2084805 A2 EP2084805 A2 EP 2084805A2 EP 07821016 A EP07821016 A EP 07821016A EP 07821016 A EP07821016 A EP 07821016A EP 2084805 A2 EP2084805 A2 EP 2084805A2
Authority
EP
European Patent Office
Prior art keywords
stator
magnet
sintered material
stator according
sections
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Withdrawn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
EP07821016A
Other languages
German (de)
English (en)
Inventor
Achim Hawighorst
Guenter Kastinger
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 EP2084805A2 publication Critical patent/EP2084805A2/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Withdrawn legal-status Critical Current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
    • H02K1/02—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
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent 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

Definitions

  • the invention relates to a stator in an electric motor according to the preamble of claim 1.
  • the stator is cup-shaped and has a receiving space for receiving a rotating armature. On the Statorinnen petitionn opposite two permanent magnets are arranged opposite one another. In the circumferential direction, the stator has a non-round cross-sectional shape, wherein the
  • Walls of the stator in the region of the magnets have the cross-section reducing flats and are formed in the remaining regions with a constant wall cross-section.
  • stators are regularly made of magnetically conductive material, which amplifies the outgoing of the permanent magnet magnetic flux through the wall of the stator. In the sections with reduced wall thickness, an increase in the magnetic flux density is achieved. The sections of greater wall thickness between the magnets ensure that the magnetic flux is maintained.
  • stators are usually designed as a deep-drawn Statortpot, which is subjected to deep drawing a machining to the desired reduction in wall thickness equal to the magnets to be attached to reach.
  • rolled stator parts can also be used.
  • the invention has for its object to simplify the production of a stator, taking into account design specifications or conditions in an electric motor, wherein the magnetic flux density should not be affected.
  • the weight of a stator should be reduced.
  • the stator part is made as a sintered component and consists at least in sections of a soft magnetic sintered material, which ensures the magnetic flux in the circumferential direction through the wall of the stator between the poles of the Magenten or between the plurality of magnets.
  • the stator can be made in the sintering process, with adjustments to structural conditions or physical objectives are easy to carry out. For example, in order to save material and weight, the wall thickness-seen in the circumferential direction-of the stator part can be reduced at least in sections without adversely affecting the magnetic flux.
  • this measure can even contribute to improving the magnetic flux through the wall of the stator, since the total wall thickness in the radial direction in the region of the magnets due to the reduced wall thickness of the stator can be made approximately the same as in the areas outside the magnets.
  • the stator can be made in the sintering process with high dimensional accuracy or correspondingly low tolerances getting produced. It is also possible
  • Attachment measures such as shoulders, hooks or the like provided on the wall of the sintered component, for example, the alignment and positioning of the stator to a subsequent transmission or the
  • stator cover To enable or facilitate stator cover. It is also possible to integrate the bracket, for example, on the body. Another advantage is that the structural design of the stator can be chosen so that vibrations and thus noise are well damped.
  • stator consist of different sintered materials, which differ in their physical
  • stator part of sintered materials with soft-magnetic properties and with hard-magnetic properties.
  • the sections of soft magnetic sintered material are in this case advantageously in the region between the magnets, the sections of hard magnetic sintered material, however, expediently form the magnets, which has the advantage.
  • the stator part and the magnets can be produced as separate components made of soft magnetic or hard magnetic sintered material, which are then joined together in a subsequent step, in particular sixteengebacken and interconnected by diffusion.
  • the magnets are located on the inside of the soft magnetic stator and the connection between the inner wall of the stator and the magnets is effected by diffusion, which has the advantage that no disturbing air gap between the inner wall and magnet, whereby magnetic leakage losses are reduced. In addition, vibrations of the magnets and resulting noise developments are avoided. - A -
  • soft magnetic and hard magnetic sintered materials can be distributed as powder in different sections of the stator and then baked by heating in a joint step.
  • the stator part and magnets form a one-piece component.
  • the magnets each consist of hard magnetic sintered material. It is also possible to provide additional magnets, which may be made of a different material. In addition, a stator made of soft magnetic sintered material can be provided with magnets which are made exclusively of sintered materials other than.
  • the soft magnetic portions in the stator part allow a desired magnetic flux in the circumferential direction between the poles of the magnets.
  • they are filled in different sections or regions into a tool which gives the stator part the shape, the finished and final component being produced from the different sintered materials in the subsequent sintering process.
  • the stator is constructed at least in two parts and comprises a radially inner stator part, which is encompassed radially by an outer stator part.
  • the stator parts may consist of two or more sintered materials in a variant of the same sintered material or in the same way.
  • Embodiment it may also be appropriate to produce the outer and the inner stator of differing sintered materials.
  • the variant with two stator parts has the advantage that additional design options exist. So it is possible, for example, that only one of the stator in the circumferential direction has an alternating wall thickness, whereas the second Stator is formed with a constant wall thickness. Alternatively, it is possible to provide both stator in the circumferential direction with changing wall thicknesses.
  • stator of a running as a small motor electric motor, wherein the stator has a ring or cylindrical stator, on the inner wall two opposite, opposite polarity permanent magnets are arranged and the wall thickness of the stator changes in the circumferential direction,
  • FIG. 2 shows a stator in an alternative embodiment with a total of four positioned on the inside of the stator permanent magnets
  • FIG. 3 shows a longitudinal section through a stator of a small motor electric motor with a cylindrical stator part, which is open at both ends,
  • Fig. 4 is a representation corresponding to Fig. 3, but with a cup-shaped stator part, which is closed at one end face.
  • the same components are provided with the same reference numerals.
  • stator 1 is part of a designed as a small motor electric motor, which is in particular a permanent-magnet DC motor, which is used in auxiliary equipment in motor vehicles, for example for the operation of sliding roofs, window regulators, windscreen wipers or the like.
  • the stator 1 comprises a ring-shaped or sleeve-shaped stator part 2, which has an inner receiving space 5 for receiving a rotatably mounted armature of the electric motor.
  • the stator 2 On the inner walls of the stator 2, two opposite-pole permanent magnets 3 and 4 are arranged on opposite sides.
  • the permanent magnets 3 and 4 have the same curvature as the inner shell of the stator part 2 and are free of play directly against the inner wall.
  • the wall thickness of the stator 2 is formed variable in the circumferential direction. In the area of the magnets 3 and 4, the wall thickness is lower, in the intermediate region between the magnets, the wall thickness is greater. This results in an elliptical outer lateral surface, whereas the inner jacket is cylindrical.
  • the angular segment over which each permanent magnet 3 or 4 extends is, for example, greater than 90 °, but less than 120 °. The transition between the smaller wall thicknesses to the larger wall thicknesses is continuous and free of cracks.
  • the material of which the stator 2 is made is a sintered material, accordingly, the stator 2 in Sintered process produced.
  • Suitable sintered materials are, in particular, soft-magnetic metal powders, in particular ferromagnetic sintered materials based on iron, cobalt or nickel or other metals.
  • the soft magnetic material has the advantage that it conducts the magnetic flux through the wall of the stator 2 in the circumferential direction particularly well.
  • the soft magnetic sintered material can be magnetized in a magnetic field.
  • the entire material of the stator 2 consists of a uniform, soft magnetic sintered material.
  • the magnets 3, 4 are made of hard magnetic sintered material and are baked as a semifinished product with the stator 2 and thereby joined together with the stator without play.
  • stator part it may also be expedient to manufacture different sections in the stator part from different sintered materials, in particular the angle segments on which the permanent magnets 3 and 4 are made of a hard magnetic sintered material and the intermediate areas of soft magnetic sintered material.
  • This embodiment offers the advantage that the hard magnetic sintered material has permanent magnetic properties; In this case, the stator part 2 and the magnets 3 and 4 form a common, one-piece component. Although additional magnets can be provided, they are not absolutely necessary.
  • stator 1 In the stator 1 shown in FIG. 2, a total of four circumferentially on the inside of the stator 2 evenly distributed magnets 3, 4, 6 and 7 are provided, wherein the wall thickness of the stator 2 in the angular segment of a magnet is lower and in the angular segment between two is enlarged adjacent magnets.
  • the outer surface of the stator 2 has convex and concave to realize the changing in the circumferential direction wall thicknesses Sections on.
  • the stator 2 is made in the same manner as in the other embodiments shown as a sintered component.
  • the stator part 2 can be designed as a hollow cylinder, which is open at both axial end faces.
  • the stator 2 is cup-shaped, is on the closed axial end face formed integrally with the wall of the stator formed a bearing 8 for supporting the armature of the electric motor.

Abstract

L'invention concerne un stator de moteur électrique qui présente une pièce de stator configurée comme corps creux et dotée d'un espace de réception qui reçoit un induit rotatif. La paroi de la pièce de stator est constituée d'un matériau magnétiquement conducteur et présente au moins un aimant. La pièce de stator est fabriquée comme composant fritté et au moins certaines de ses parties sont constituées d'un matériau magnétique doux fritté.
EP07821016A 2006-10-25 2007-10-08 Stator de moteur électrique Withdrawn EP2084805A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610050166 DE102006050166A1 (de) 2006-10-25 2006-10-25 Stator in einem Elektromotor
PCT/EP2007/060643 WO2008049721A2 (fr) 2006-10-25 2007-10-08 Stator de moteur électrique

Publications (1)

Publication Number Publication Date
EP2084805A2 true EP2084805A2 (fr) 2009-08-05

Family

ID=38935933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821016A Withdrawn EP2084805A2 (fr) 2006-10-25 2007-10-08 Stator de moteur électrique

Country Status (3)

Country Link
EP (1) EP2084805A2 (fr)
DE (1) DE102006050166A1 (fr)
WO (1) WO2008049721A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040349B4 (de) 2008-07-11 2018-07-12 Volkswagen Ag Verfahren und Vorrichtung zur Herstellung eines Stators einer elektrischen Maschine
DE102009046902A1 (de) 2009-11-20 2011-05-26 Robert Bosch Gmbh Stator in einem Elektromotor
DE102011121177A1 (de) * 2011-12-16 2013-06-20 Oechsler Aktiengesellschaft Motor eines elektromotorischen Stellelementes und Verfahren zu seiner Herstellung
EP2947755A1 (fr) * 2014-04-07 2015-11-25 Imer International S.p.A. Moteur électrique

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1520744A (en) * 1975-09-16 1978-08-09 Smiths Industries Ltd Dynamoelectric machines
US4980593A (en) * 1989-03-02 1990-12-25 The Balbec Corporation Direct current dynamoelectric machines utilizing high-strength permanent magnets
JPH069578Y2 (ja) * 1989-08-29 1994-03-09 マブチモーター株式会社 小型モータ用界磁マグネット
JPH07169633A (ja) * 1993-12-15 1995-07-04 Kanegafuchi Chem Ind Co Ltd ヨーク一体型永久磁石の製造方法並びに当該製造方法により作製したヨーク一体型永久磁石
DE19912470B4 (de) * 1999-03-19 2005-06-02 Vacuumschmelze Gmbh Verbundteil und Verfahren zu dessen Herstellung
US6889419B2 (en) * 2002-04-16 2005-05-10 Delphi Technologies, Inc. Method of making a composite electric machine component of a desired magnetic pattern
JP4075441B2 (ja) * 2002-04-18 2008-04-16 トヨタ自動車株式会社 電動機ロータの製造方法
WO2006064948A1 (fr) * 2004-12-17 2006-06-22 Hitachi Metals, Ltd. Rotor pour moteur et son procede de fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008049721A3 *

Also Published As

Publication number Publication date
WO2008049721A3 (fr) 2008-08-28
DE102006050166A1 (de) 2008-04-30
WO2008049721A2 (fr) 2008-05-02

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