WO2008037640A1 - Stator dans un moteur électrique - Google Patents

Stator dans un moteur électrique Download PDF

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Publication number
WO2008037640A1
WO2008037640A1 PCT/EP2007/059892 EP2007059892W WO2008037640A1 WO 2008037640 A1 WO2008037640 A1 WO 2008037640A1 EP 2007059892 W EP2007059892 W EP 2007059892W WO 2008037640 A1 WO2008037640 A1 WO 2008037640A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
wall thickness
circumferential direction
magnet
magnets
Prior art date
Application number
PCT/EP2007/059892
Other languages
German (de)
English (en)
Inventor
Achim Hawighorst
Guenter Kastinger
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
Priority to EP07820336A priority Critical patent/EP2070181A1/fr
Publication of WO2008037640A1 publication Critical patent/WO2008037640A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation

Definitions

  • the invention relates to a stator in an electric motor according to the preamble of claim 1.
  • the stator has a receiving space for receiving a rotationally mounted armature, wherein on the stator inner walls opposite two opposite-pole permanent magnets are arranged.
  • 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 diminishing flattenings and are formed in the remaining regions with a constant wall cross-section. Seen over the circumference of the stator thus has sections with tapered wall thickness and sections with greater wall thickness. Since such stators are usually made of magnetically conductive material, which leads to an increase in the magnetic flux in the material of the wall, an increase in the magnetic flux density is achieved by the cross-sectional reduction. The sections between the magnets with increased wall thickness ensure that the magnetic flux between the magnets is maintained.
  • the invention has for its object to reduce the weight of a stator in an electric motor without affecting the magnetic flux density with simple measures.
  • the stator is constructed at least in two parts with a radially inner and a radially outer stator part, wherein at least one of the stator parts has an alternating wall thickness in the circumferential direction.
  • the changing wall thickness which changes continuously and without a jump in the circumferential direction, in particular as in the first aspect of the invention, enables a largely uniform magnetic flux between the north and south poles of the magnet or the magnets.
  • stator parts Possible is both an embodiment with a first stator with constant wall thickness and the second stator with changing wall thickness as well as a version with two stator with changing wall thicknesses that change in the circumferential direction and partially compensate or reinforce. If one of the stator parts has a constant wall thickness, then this can be both the inner and the outer stator ring, and accordingly the respective other stator part has an alternating wall thickness. The portions of tapered wall thickness are in turn at the level of the magnets, which are positioned on the inside of the stator.
  • both stator parts have a wall thickness which varies in the circumferential direction
  • the entire housing is Wall thickness in the radial direction, formed by the two directly superimposed stator parts, reduced in the region of the magnets and reinforced in the area outside the magnets.
  • stator parts in the radial direction offers the advantage of a larger structural design option.
  • different materials can be used for the stator parts, whereby influence on the physical properties, in particular on the course of the magnetic flux density can be taken.
  • the stability can also be improved, for example by the use of a particularly stable stator part.
  • the wall of the stator is made of magnetically conductive material and has an alternating wall thickness seen in the circumferential direction.
  • the wall thickness is tapered, whereas the areas between the magnets are at least partially reinforced.
  • the transitions between the sections of tapered and reinforced wall thicknesses are continuous and free of cracks, so that both the envelope of the outer lateral surface and the first derivative of the envelope are continuous, expediently both on the inside of the stator and on the outside ,
  • the larger wall thickness between the magnets allows a smooth flow without appreciable change in flux density and without wastage.
  • the weight of the stator part and thus of the stator can be reduced overall due to the sections with reduced wall thickness.
  • the wall thickness changes smoothly and without jump, jumps in the magnetic flux density can be avoided.
  • At least one stator part is ring-shaped or sleeve-shaped, so that a peripheral, closed wall is provided in the circumferential direction.
  • the second stator part can either be ring-shaped or sleeve-shaped or According to an alternative embodiment, form individual segments that do not extend over the entire circumference, but only over a limited angle segment. These individual segments are connected to the annular or sleeve-shaped stator part and are located in particular at the sections where an overall greater wall thickness, formed by the summation of the inner and outer stator part, should be given.
  • the individual stator segments can form either the inner stator parts or the radially outer stator parts.
  • an additional cylindrical holding part which expediently likewise consists of magnetically conductive material and forms a stator part.
  • This cylindrical holding part can be combined with the two inner and outer stator parts, of which at least one, if appropriate also both, have a wall thickness region which changes in the circumferential direction.
  • the cylindrical holding part usually forms the innermost stator part, on the inner wall, the magnets are attached.
  • the inner stator part, on which the magnets are arranged, has a receiving space with a cylindrical cross-section, which is produced in two steps according to a preferred method for producing the stator.
  • a first step by forming, in particular by deep drawing a cylindrical component having a constant wall thickness is produced, wherein the wall thickness is reduced in a subsequent, second step by forming, for example by means of rolling.
  • the forming process has the advantage of solidifying the material.
  • the second step involves at the same time producing a section with a tapered wall thickness.
  • a stator which is in particular annular, formed in the circumferential direction alternately convex and concave, wherein the Transition between convex and concave sections advantageously continuous and jump-free.
  • stator of an electric motor designed as a small motor, wherein the stator has an inner, annular part with constant wall thickness and a radially outer annular stator part with variable wall thickness and placed on the inside of the inner stator two opposing magnets,
  • FIG. 2 shows a cross section through a further embodiment of a
  • Stator having a cylindrical, inner stator part with a constant wall thickness and two outer stator segments, each with a variable wall thickness
  • Fig. 3 shows a cross section through a further embodiment with an inner, cylindrical stator part with a constant wall thickness and an outer, annular
  • Stator part with changing wall thickness adapted to a version with a total of four individual magnets
  • Fig. 4 shows a cross section through a stator with four magnets, wherein the outer stator part four individual
  • FIG. 5 shows a longitudinal section through a stator of a small motor electric motor with inner and outer, respectively annular stator part, wherein the inner stator part, which receives the magnets, is open at both end faces
  • Fig. 6 is a Fig. 5 corresponding representation, wherein the inner stator part, which receives the magnets, is open at both end faces
  • Fig. 6 is a Fig. 5 corresponding representation, wherein the inner
  • Stator part is cup-shaped with a closed end face
  • 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 radially inner, annular or sleeve-shaped stator part 2 and a radially outer, likewise annular or sleeve-shaped stator 3.
  • the inner stator 2 is an inner, cylindrical receiving space 6 for Recording of the rotating armature.
  • Inner wall of the inner stator part 2 opposite polarity permanent magnets 4 and 5 are arranged, which are formed part-circular and extend over a limited angular segment of the wall inside.
  • Each magnet 4 or 5 covers an angular segment of slightly more than 90 °, so that between the magnets 4 and 5, an angular segment remains free, which extends approximately over an angular range of 60 to 80 °.
  • the inner stator 2 is cylindrical with a constant wall thickness.
  • the outer stator 3 is located directly on the Lateral surface of the inner stator 2 and has in
  • the outer stator part 3 Seen circumferentially a changing wall thickness.
  • the outer stator part 3 has a reduced wall thickness, whereas in the region of the segment section in which no magnets are arranged, the outer stator part 3 has a reinforced wall section.
  • the transition between the wall sections with reduced wall thickness and the wall sections with greater wall thickness is fluent and continuous, avoiding jumps.
  • the total wall thickness, formed by the inner stator part 2, the outer stator part 3 and the magnets 4 and 5, as far as they extend over the circumference, is selected such that an approximately constant wall thickness is provided in the circumferential direction over 360 °.
  • the outer stator 3 is not designed as a continuous ring, but formed in two parts with two individual segments 3a and 3b, which extend along those angle sections at which no
  • each segment 3a and 3b has a varying cross-section, which is greatest in the middle and continuously drops towards the two lateral ends.
  • the magnets 4 and 5 there is no outer stator segment.
  • a total of four magnets 4, 5, 7 and 8 are distributed uniformly over the circumference on the inner casing of the inner stator part 2, which is designed as a ring or sleeve with a constant wall thickness.
  • the outer stator part 3 is likewise designed in the shape of a ring or sleeve, but the wall thickness in the region of the angular segments which have a magnet is reduced and reinforced in the angular segment between two adjacent magnets. The transition between the different wall thicknesses is fluent.
  • the angle segment with a magnet is about 60 °, the angle segment without a magnet about 30 °.
  • the outer stator part is four in total
  • FIGS. 5 and 6 each show a longitudinal section through a stator 1 with an inner stator part 2 and an outer stator part 3 and a magnet 4 fastened to the inner wall of the inner stator part 2.
  • both stator parts are sleeve-shaped, the respective end faces are open.
  • an end face of the inner stator 2 is formed closed, in the region of this end face is located in the wall of a bearing 9 for receiving the armature shaft of the electric motor.
  • connection between the inner and outer stator 2 and 3 takes place in the case of a ring-shaped or sleeve-shaped outer stator by pressing, rolling, shrinking,
  • Embossing or similar In the case of individual segments, these can be fixed by welding, riveting, embossing etc.
  • Suitable materials for the inner stator 2 and the outer stator 3 are magnetically conductive materials, in particular soft magnetic materials such as ferromagnetic materials. Possible is both a version with the same material for inner and outer stator and a version with different materials.
  • stator is designed to accommodate four individual magnets, which are distributed over the circumference on the inside of the stator.
  • the inner stator part has four individual stator segments 2a, 2b, 2c and 2d, each changing in the circumferential direction Have cross section and in the middle of the highest
  • the four segments are designed as individual segments.
  • the outer stator 3 is formed annular or sleeve-shaped and has an approximately constant wall thickness in the circumferential direction.
  • the shape of the outer stator part 3 is convex-concave in the circumferential direction such that a total of four concave sections alternate with four intermediate convex sections.
  • the individual segments 2a, 2b, 2c and 2d are located on the inside of the outer ring 3.
  • the magnets are arranged in the region of the intermediate convex portions which are at least partially free of the inner segments.
  • stator is designed to receive two individual magnets.
  • the inner stator part 2 is made in two parts and has two opposite segments 2a, 2b, which are not connected to each other and have a cross-sectional shape executed in the manner described above.
  • the outer, annular stator part 3 has an oval outer
  • the wall thickness of the outer stator 3 is not constant in the circumferential direction, it decreases in the direction of the individual sections out, in which there is no inner segment.
  • FIG. 9 corresponds in essential parts to that of FIG. 7, so that reference is made in this respect to the description there.
  • in the embodiment of FIG. 9 is an additional cylindrical
  • Holding part 10 is provided, which forms the innermost stator.
  • the cylindrical holding part 10 is made of magnetically conductive material, in particular of a soft magnetic material.
  • the cylindrical holding part 10 has a constant wall thickness in the circumferential direction.
  • the segments 2 a to 2 d of the outer stator part are fixed, on the inner wall, the magnets are arranged and fixed.
  • the attachment of both the segments on the outside and the magnets on the inside can be done for example by means of punched and bent shots or tabs on the wall of the holding part 10.
  • stator 1 is designed to receive two permanent magnets. As in the previous one
  • a cylindrical holding part 10 which forms the innermost stator.
  • two individual segments 2 a and 2 b of the inner stator part are fixed, each of the largest cross section towards the center and a sloping towards the sides
  • the two segments 2a and 2b are enclosed by an annular, outer stator part 3, which has a constant wall thickness in the circumferential direction.
  • the outer stator part 3 is elliptical.
  • the stator 1 shown in FIG. 11 has two stator parts 2 and 3, whose lateral surface is in each case convex and concave. In the case of both stator parts, convex sections with concave sections alternate in the circumferential direction.
  • the wall thickness of the inner stator part 2 varies in the circumferential direction, wherein the convex portions have a greater wall thickness and the concave portions have a smaller wall thickness.
  • the stator 1 in the embodiment of FIG. 12 is designed to receive two permanent magnets and has two annular or sleeve-shaped stator 2 and 3, of which the inner stator 2 has an alternating wall thickness, whereas the outer stator 3 has a constant wall thickness , Both stator parts 2 and 3 have an elliptical cross-sectional shape.
  • stator parts are provided, namely, in addition to the inner stator part 2 and the outer stator part 3, the cylindrical holding part 10, which forms the radially innermost stator part.
  • the embodiment according to FIG. 13 essentially corresponds to that according to FIG. 9, However, with the difference that the inner stator 2 is formed as a circumferential ring, whereas in FIG. 9, the stator 2 has individual, independent segments 2a to 2d.
  • the magnets 4, 5, 7 and 8 are additionally registered, which are each in the range of angular segments with a small wall thickness.
  • FIG. 14 corresponds to that according to FIG. 12, but in FIG. 14 additionally two permanent magnets 4 and 5 are arranged on diagonally opposite inner sides of the inner
  • Stator part 2 located.
  • the magnets 4 and 5 are in the range of thinner wall thicknesses of the inner stator 2.
  • FIGS. 15 to 17 show further exemplary embodiments of stators 1 in longitudinal section.
  • the inner stator part 2 has a ring-shaped or sleeve-shaped design, whereas the outer stator part 3 is additionally closed at one end side and therefore has a pot shape.
  • a bearing 9 for supporting the armature shaft.
  • FIG. 16 corresponds in principle to that according to FIG. 15, but in FIG. 16 additionally a magnet 4 is drawn on the inner wall of the inner stator part 2.
  • inner stator 2 and outer stator 3 are each formed as a sleeve which is open at both axial ends.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un stator dans un moteur électrique qui présente une partie de stator conçue en tant que corps creux, comprenant un espace de réception pour la réception d'un induit rotatif. La paroi de la partie de stator est constituée d'un matériau magnétiquement conducteur et est le support d'un aimant. La paroi de la partie de stator présente une épaisseur de paroi variable dans le sens périphérique, qui converge dans le secteur de l'aimant et qui est conçu de manière renforcée au moins par sections dans le secteur à l'extérieur de l'aimant. Le stator est construit au moins en deux parties avec une partie de stator intérieure et une partie de stator extérieure, au moins une des parties de stator présentant une épaisseur de paroi variable dans le sens périphérique.
PCT/EP2007/059892 2006-09-26 2007-09-19 Stator dans un moteur électrique WO2008037640A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07820336A EP2070181A1 (fr) 2006-09-26 2007-09-19 Stator dans un moteur électrique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006045355.7 2006-09-26
DE200610045355 DE102006045355A1 (de) 2006-09-26 2006-09-26 Stator in einem Elektromotor

Publications (1)

Publication Number Publication Date
WO2008037640A1 true WO2008037640A1 (fr) 2008-04-03

Family

ID=38814292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/059892 WO2008037640A1 (fr) 2006-09-26 2007-09-19 Stator dans un moteur électrique

Country Status (3)

Country Link
EP (1) EP2070181A1 (fr)
DE (1) DE102006045355A1 (fr)
WO (1) WO2008037640A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2967530A1 (fr) * 2010-11-12 2012-05-18 Bosch Gmbh Robert Boitier polaire en forme de pot de moteur electrique et son procede de fabrication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777717A (en) * 1986-03-24 1988-10-18 Mitsubishi Denki Kabushiki Kaisha Method for manufacturing a magnet-type motor yoke assembly
JPH09275648A (ja) * 1996-03-31 1997-10-21 Sanyo Electric Co Ltd マグネットモータのステータ
DE19808550C1 (de) * 1998-02-28 1999-07-29 Bosch Gmbh Robert Elektromotor
DE10115445A1 (de) * 2000-03-30 2001-10-04 Asmo Co Ltd Motorjoch und Verfahren zum Herstellen desselben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777717A (en) * 1986-03-24 1988-10-18 Mitsubishi Denki Kabushiki Kaisha Method for manufacturing a magnet-type motor yoke assembly
JPH09275648A (ja) * 1996-03-31 1997-10-21 Sanyo Electric Co Ltd マグネットモータのステータ
DE19808550C1 (de) * 1998-02-28 1999-07-29 Bosch Gmbh Robert Elektromotor
DE10115445A1 (de) * 2000-03-30 2001-10-04 Asmo Co Ltd Motorjoch und Verfahren zum Herstellen desselben

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2967530A1 (fr) * 2010-11-12 2012-05-18 Bosch Gmbh Robert Boitier polaire en forme de pot de moteur electrique et son procede de fabrication

Also Published As

Publication number Publication date
DE102006045355A1 (de) 2008-04-03
EP2070181A1 (fr) 2009-06-17

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