EP2596569A2 - Procédé et dispositif de fabrication d'un élément de machine annulaire, destiné à être utilisé en particulier dans une machine électrique - Google Patents

Procédé et dispositif de fabrication d'un élément de machine annulaire, destiné à être utilisé en particulier dans une machine électrique

Info

Publication number
EP2596569A2
EP2596569A2 EP11730964.1A EP11730964A EP2596569A2 EP 2596569 A2 EP2596569 A2 EP 2596569A2 EP 11730964 A EP11730964 A EP 11730964A EP 2596569 A2 EP2596569 A2 EP 2596569A2
Authority
EP
European Patent Office
Prior art keywords
sheet metal
metal strip
sheet
cylindrical
helically
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Withdrawn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
EP11730964.1A
Other languages
German (de)
English (en)
Inventor
Steven Andrew Evans
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 EP2596569A2 publication Critical patent/EP2596569A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H02K15/021—Magnetic cores
    • H02K15/026—Wound cores

Definitions

  • the present invention relates generally to a method of manufacturing a machine element for an electric machine, and more particularly to a method of manufacturing an annular machine element.
  • Hohizylinderformige bodies are used in particular in electrical machines for the production of stators or Statorhalterept. Since magnetic alternating fields generally occur in electrical machines, it is often desirable to avoid such eddy currents to avoid eddy currents, i. layered, in particular by stacking of correspondingly shaped sheets to build up to prevent eddy currents occurring in the direction parallel to the axis of a direction of the cylindrical body.
  • a number of annular lamellae are punched out of a metal sheet and the individual annular lamellae are stacked on one another to produce the laminated ring.
  • the individual ring lamellae can be connected to each other either by stamped interconnections or by welding.
  • the advantage of this method is that a steel sheet can be used which has a high silicon content, whereby the hysteresis and eddy current losses are minimized when applying an alternating magnetic field can.
  • a disadvantage of this method is the high consumption of sheet material, especially when the cylindrical body has a very low ratio of its radial thickness to the outer diameter. This high proportion of punching waste and the resulting high material costs make this process unattractive.
  • a second method is to make a rectilinear sheet metal strip and wrap the stamped sheet metal strip around its edge to form the laminated ring.
  • the laminated ring is then wound helically or helically. Since the metal strips are punched in a straight line, they can be produced with very little stamping waste.
  • a disadvantage of this method is that only very ductile steel can be used as a material for the metal strip, since the strip is strongly deformed around the edge during the winding process in order to achieve the required annular geometry. Since, with a high silicon content in the material of the stamping sheet, its flexibility is greatly reduced, only steel sheets with a low silicon content can be used for this method to produce the cylindrical body. By using steel sheets with a low silicon content, the iron losses in the annular body when exposed to an alternating magnetic field are higher than in the method described above, which also makes this method unattractive.
  • a method for producing a cylindrical machine element is provided, in particular for an electrical machine. The method comprises the following steps:
  • Width direction which is parallel to the sheet main plane, having;
  • An idea of the above method is to produce a hollow cylindrical body of laminated construction from a helical sheet metal element, which can be made, for example, by stamping or laser cutting, by helical winding about its narrow edge. Due to the initial spiral shape of the sheet metal strip of the sheet metal element, this does not have to be deformed as much as a straight sheet metal strip, as described in the prior art. This means that even a less flexible steel can be used as material for the sheet metal element, such as steels with a higher silicon content, in order to reduce the iron losses in an alternating magnetic field.
  • the material consumption is considerably lower than when punching annular sheet metal elements, as known from the prior art, would be the case, thereby causing lower costs.
  • at least a part of the turns of the spirally wound sheet metal strip can be fixed to one another or to a carrier element by gluing, welding or clamping.
  • the sheet metal element may be provided with an inner radius of a first turn and an outer radius of a last turn, wherein a radius of the feature element is between the inner radius and the outer radius.
  • the sheet metal strip of the sheet metal element can be fixed with one end to the mold element, wherein for winding the sheet metal strip, the mold element is rotated, so that the spiral-shaped sheet metal strip winds on the mold element and thereby applies to the outer contour of the formula element.
  • a cylindrical machine element which is manufactured by the above method or can be produced.
  • a use of the above machine element is provided as a stator or stator of an electric machine.
  • an apparatus for producing a cylindrical machine element in particular for use in an electrical machine, is provided.
  • the device comprises:
  • a cylindrical, in particular circular cylindrical form element in order to wind the metal strip in a plurality of turns helically in the axial direction of the body, so that the turns of the metal strip lie in the thickness direction and the width direction of the sheet metal strip in a direction which is perpendicular to the axial Direction of the formula element;
  • FIGS 1 a and 1 b different embodiments of a spiral
  • Sheet metal element for producing a cylindrical body with lamellar construction
  • Figure 2 is a perspective view of a cylindrical
  • a lamellar body made of one of the spiral sheet members of Figures 1 a or 1 b;
  • FIGS. 3a to 3c show an arrangement of the spiral-shaped sheet-metal element on a spindle in order to wind it;
  • Figures 4a and 4b is an illustration of the tensioning device for winding the
  • Figure 5 is a detail view of the stamp of the application unit for
  • Figures 6a to 6e a detailed illustration of the method for winding the spiral-shaped sheet metal element on a spindle.
  • a method of manufacturing a cylindrical machine element such as a cylinder, will be described.
  • a stator or a stator holder described in lamella design.
  • An essential element for the manufacturing process consists in a sheet metal element 1, which has a sheet metal strip with a spiral geometry in a sheet main plane. Two embodiments of such sheet metal elements 1 are shown in Figures 1 a and 1 b.
  • the spiral-shaped sheet metal elements of Figures 1 a and 1 b differ in their production.
  • the spiral Sheet metal element 1 of Figure 1a is produced by punching, wherein between the individual tracks of the spiral-shaped sheet metal element 1, a distance due to the width of the punch blade occurs.
  • the radial distance for example when using a stamping process for producing the spiral-shaped sheet-metal element 1, is approximately 1 mm and corresponds to the thickness of the punching tool.
  • the spiral-shaped sheet metal element of Figure 1 b is produced by means of a laser cutting process, with which much narrower and more accurate cutting edges can be produced.
  • the radial distance between the tracks of the spiral-shaped sheet metal element in the radial direction is negligible and is only about 0.05 mm when using a laser cutting process.
  • the difference between the two geometries shown in FIGS. 1a and 1b is merely that the radial distance between two adjacent turns of the spiral sheet metal element 1 is different.
  • the spiral-shaped sheet metal element 1 will now over its inner edge, i. the directed to the center of the spiral geometry edge, wound on a preferably circular cylindrical spindle 2 as a molding element, wherein the winding is helical or helical.
  • the helical shape of the winding has an offset between adjacent turns in the axial direction of the spindle and not in the radial direction.
  • the offset preferably corresponds to the thickness of the sheet metal element 1, so that the individual layers of the turns of the sheet metal element 1 abut each other.
  • the deformation during winding of the sheet metal element 1 on the spindle 2 is considerably lower than when winding a straight sheet metal element or a straight sheet metal strip, as mentioned above.
  • the spiral-shaped sheet-metal element already has a curved contour.
  • steel with a higher silicon content can be used as the material for the sheet metal element 1 in order to minimize the iron losses, such as, for example, hysteresis losses and eddy current losses, which occur in a magnetic field. can see form alternating field. This can be advantageous for many applications, for example for electronically commutated electrical machines.
  • FIG. 2 shows a cylindrical body produced from the spiral-shaped sheet-metal elements of FIGS. 1 a or 1 b in a laminated construction, which has been produced by wrapping a circular-cylindrical spindle 2 with the inner edge of the spiral-shaped sheet metal element 1.
  • a plurality of such bodies can be placed on one another from a plurality of spiral-shaped sheet metal elements in order to lengthen the cylindrical body in the axial direction.
  • steel sheets classified as non-grain oriented have a slight magnetic preferential direction.
  • the steel sheet is slightly easier or faster to magnetize as compared to the right-angle direction.
  • the individual cylindrical bodies produced from a respective spiral sheet metal element can be rotated by a certain angle relative to one another before they are placed on one another. As a result, the preferred magnetic direction is also rotated, so that there is no more preferred magnetic direction in the finished cylindrical body.
  • the spindle with the spiral sheet metal element automatically the magnetic preferred direction with each turn, since the radius of each turn of the spiral-shaped sheet metal element varies.
  • the winding of the spindle with the spiral-shaped sheet metal element has the further advantage that the cylindrical body in one piece, ie from a single spiral Sheet metal element, can be constructed without a magnetic anisotropy must be taken into account.
  • FIGS. 3 a to 3 c, 4 a and 4 b and 5 schematically illustrate methods and devices for carrying out the method for producing a cylindrical body in a laminated construction.
  • Figures 3a to 3c show the initial position and the arrangement of the spiral-shaped sheet metal element 1 on a spindle, before the strip of the spiral-shaped sheet metal element is wound around the spindle 2.
  • the outer diameter of the spindle corresponds for example to the inner diameter of the desired cylindrical body.
  • the spiral-shaped plate member 1 is fixed on the spindle 2 at a point P and held in the vertical position by guides 3 shown in Fig. 3b.
  • the spiral-shaped sheet metal element 1 is then held at the point Q on a subsequent turn of the spiral-shaped sheet metal element and placed under tension with a force T, which acts tangentially to the lateral surface of the spindle 2. Under this tension, the point Q is moved to a position immediately past the point P while one complete revolution of the cylindrical spindle 2 is performed.
  • a lateral force F is exerted during this first turn of the cylindrical body, distributed over a region A around its circumference, as shown in FIG. 3c by the hatched area.
  • This distributed side force F keeps the spiral sheet metal element on its edge as it is wound around the edge under the tension T around the spindle. Without this side force F, the strip of the spiral sheet metal element would of course bend and lay flat on the surface of the spindle.
  • FIG. 4b shows a plan view of FIG. 4a.
  • point Q can be seen behind point P.
  • the strip is held at the point Q by an application unit 4 with two punches 5 which exert two forces F T on the strip. These two forces F T are large enough to hold strip 1 firmly in the correct position, but sufficiently low to allow the strip of strip of the spiral To allow sheet metal element 1 to slide between the two punches 5, when it is wound on the spindle 2.
  • FIG. 5 shows a cross section of the two punches 5 of the application unit 4 and the 5 sheet metal strip.
  • One of the punches 5 (in this case the left punch) is formed with a guide 6 to prevent the metal strip of the spiral sheet metal element 1 from moving laterally when it is wound.
  • the two punches 5 are positioned by a clamping arm, which compresses the punches 5 and exerts the tension T on the sheet metal strip of the spiral-shaped sheet metal element 1 when it is wound.
  • FIG. 6 shows the winding process in five stages.
  • FIG. 6a shows the initial position of the spiral sheet metal element 1 before the winding process starts.
  • the spindle 2 is rotated about its Z axis at a constant winding speed ⁇ , while at the same time the sheet metal element is moved in the Z direction at a constant linear velocity s.
  • the total linear offset d of the spindle in the Z-direction is equal to the required height of the cylindrical body minus the thickness of the spiral-shaped sheet metal element.
  • FIGS. 6b to 6d show the spiral-shaped sheet-metal element in the winding process. During this process, the unwound part of the spiral sheet metal element 1 is within guides. The sheet metal element 1 wound around the spindle 2 is then either by welding the body
  • the body can be thermally treated at a high temperature. This can also reduce the hysteresis losses that occur in the thus constructed

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un élément de machine cylindrique, en particulier pour une machine électrique, comprenant : la fourniture d'un élément en tôle (1) comportant une bande de tôle s'étendant en spirale dans un plan principal de tôle et ayant une épaisseur dans une direction d'épaisseur s'étendant perpendiculairement au plan principal de tôle et une largeur dans une direction de largeur s'étendant parallèlement au plan principal de tôle; l'enroulement de la bande de tôle en plusieurs spires en hélice ou en boudin autour d'un élément de formage (2) cylindrique, en particulier cylindrique circulaire, dans la direction axiale de ce dernier, de sorte que les spires de la bande de tôle soient superposées dans la direction d'épaisseur et que la direction de largeur de la bande de tôle s'étende dans une direction qui est perpendiculaire à la direction axiale de l'élément de formage (2); l'enlèvement de la bande de tôle enroulée de l'élément de formage (2), afin d'obtenir l'élément de machine.
EP11730964.1A 2010-07-20 2011-07-08 Procédé et dispositif de fabrication d'un élément de machine annulaire, destiné à être utilisé en particulier dans une machine électrique Withdrawn EP2596569A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010031552 DE102010031552A1 (de) 2010-07-20 2010-07-20 Verfahren und Vorrichtung zum Herstellen eines ringförmigen Maschinenelements, insbesondere zum Einsatz in einer elektrischen Maschine
PCT/EP2011/061665 WO2012010446A2 (fr) 2010-07-20 2011-07-08 Procédé et dispositif de fabrication d'un élément de machine annulaire, destiné à être utilisé en particulier dans une machine électrique

Publications (1)

Publication Number Publication Date
EP2596569A2 true EP2596569A2 (fr) 2013-05-29

Family

ID=44503766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11730964.1A Withdrawn EP2596569A2 (fr) 2010-07-20 2011-07-08 Procédé et dispositif de fabrication d'un élément de machine annulaire, destiné à être utilisé en particulier dans une machine électrique

Country Status (4)

Country Link
EP (1) EP2596569A2 (fr)
CN (1) CN103125062A (fr)
DE (1) DE102010031552A1 (fr)
WO (1) WO2012010446A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014205207A1 (de) * 2014-03-20 2015-09-24 Robert Bosch Gmbh Verfahren zur Herstellung eines elektrischen Wirkelements für einen Elektromotor und elektrisches Wirkelement
WO2022194390A1 (fr) * 2021-03-19 2022-09-22 Che-Motor Ag Appareil électromécanique rotatif et procédé de fabrication d'enroulement de stator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279560A (fr) * 1960-12-08 1961-12-22 Thomson Houston Comp Francaise Méthodes et appareils de construction de corps magnétiques
FR2109301A5 (fr) * 1970-10-09 1972-05-26 Unelec
JPS6016159A (ja) * 1983-07-07 1985-01-26 Mitsubishi Electric Corp 回転電機の製造方法
US8127429B2 (en) * 2006-11-27 2012-03-06 Honda Motor Co., Ltd. Method for producing ring core
CN201440630U (zh) * 2009-07-21 2010-04-21 上海申意汽车零部件有限公司 用于卷叠汽车发电机铁芯的装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012010446A2 *

Also Published As

Publication number Publication date
WO2012010446A2 (fr) 2012-01-26
CN103125062A (zh) 2013-05-29
DE102010031552A1 (de) 2012-01-26
WO2012010446A3 (fr) 2012-12-20

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