Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
  • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots

Definitions

• Part of a rotating electrical machine Method of manufacturing such a part and rotating electrical machine equipped with such a part
• the invention relates to a part of a rotating electrical machine, a method of manufacturing such a part and a rotary electric machine equipped with such a part.
• Rotating electrical machines such as, for example, alternators, generally comprise at least one part which carries a winding in order to put in relation a magnetic field within the machine (linked to the movement of the latter) and the current in the different parts of the winding
• a solution commonly used to form this winding consists in providing a substantially cylindrical body along the axis of rotation of the rotating machine, generally formed of a stack of sheets along the same axis, and provided with essentially parallel longitudinal notches. to this axis and which receive the windings which form the winding.
• Parts for rotating electrical machines of this type are for example described in documents GB 2 325 350, DE 1 203 374 and US 2006/0152100.
• the document WO 2005/064766 proposes starting from a rectilinear body having parallel and aligned notches, depositing the coil on this rectilinear body, then deforming the body provided with the coil so as to obtain its cylindrical shape. final.
• This document which mentions filling factors of between 50% and 80%, does not concern the problem of space within the notches.
• the invention proposes according to a first aspect a piece of a rotating electrical machine, in particular a stator or a rotor, comprising a winding wound on a cylindrical body having longitudinal notches, characterized in that a notch receives at least first and second segments of the winding at a level of a circumference of the body and in that the first segment has, at least at the level of the notch, a section with a rounded portion and a flat surface opposite the second segment.
• the flat part makes it possible to house the first segment on the same circumference as the second segment while requiring only a limited space. Moreover, such a segment is easy to obtain from a wire of circular section.
• the flat can be radial relative to the cylindrical body, which optimizes the storage of the segment.
• the rounded portion has for example a diameter greater than 1.5 mm, in which case the reduction in size allowed by the flat is particularly interesting.
• the rounded portion may have a diameter less than 1.5 mm.
• the notch receives a third segment of the coil having, at least locally, a diameter different from the diameter of the rounded part.
• different initial diameter wires are provided within the notch, for example for reasons related to the electrical operation of the machine.
• each of the winding segments received in the notch may have, at least locally, a diameter equal to the diameter of the rounded portion.
• a single diameter of wire is used here. It can be provided in practice that the section of the first segment has a second flat substantially parallel to said flat, which allows a further reduction of the bulk.
• each of the segments of the winding received in the notch has two flats essentially parallel and distant with a width equal to that separating the second flat and said flat. It is thus expected that all segments of the notch have the same width, which simplifies the tooling, including insertion of the son in the notch.
• the notch receives a third segment of the winding comprising two flats essentially parallel and spaced apart by a width different from that separating the second flat and said flat.
• different widths are provided for the segments situated in the same notch, for example to adapt to a variable width of the notch.
• the notch may further receive at least one additional segment, different from the first and the second segment, at said circumference. There is thus a row of at least three segments.
• the notch may receive at least two distinct segments each of the first and second segments at a second circumference different from said circumference. The notch then receives at least two rows of segments.
• the first segment may extend outside the notch into a segment of circular section; - The first segment extends outside the notch in a segment having a circumferential flat relative to the cylindrical body, to obtain a compact storage son at the buns;
• the first segment extends at each of its ends outside the notch towards notches distant from the first notch (corrugated winding);
• the notch receives an immobilization block of segments of the winding including the first and the second segment, notably thanks to the space left free thanks to the "row" storage of the segments.
• At least one of the notches has two non-parallel side walls, the distance between these walls being in particular decreasing towards the center of the stator.
• the side walls of the notch may be parallel.
• the invention proposes a part of a rotating electrical machine comprising a winding wound on a cylindrical body having longitudinal notches, characterized in that a first notch receives a segment of the winding of which the ends extend respectively to second notches distant from the first notch and in that the segment presents, at less at the first notch, a section with two flats separated by two rounded parts.
• These include a corrugated winding.
• the invention proposes a part of a rotating electrical machine comprising a winding wound on a cylindrical body having longitudinal notches, characterized in that the winding comprises a first segment located outside the notches and having a circular section, and a second segment located in a notch and whose section comprises a flat.
• the invention proposes a part of a rotating electrical machine comprising a coil wound on a cylindrical body having longitudinal notches, characterized in that a notch receives at least a first and a second segment of the winding at a circumference of the body, and a shim for immobilizing a plurality of segments of the winding including the first and second segments, and in that the first segment has a radial flat with respect to the body and next to the second segment.
• the invention furthermore proposes a method for manufacturing a part of a rotating electrical machine comprising a winding wound on a cylindrical body having longitudinal notches, characterized by the following steps:
• Such a method may also optionally have characteristics equivalent to those envisaged above for the part itself.
• son diameters originally different are used to form the winding, these son being worked to obtain ribs on identical flat. This allows, if desired, to work with several son of diameters initially different on the same tool.
• the invention makes it possible to adapt the shape of the son or son to that of the notch.
• the shape of the notch may be variable depending on the product line, which requires a drawing of the placement of the wires in the notch to determine the best shape.
• the insertion order of the son may, if necessary, take on a particular importance.
• FIG. 1 shows a sectional view of a part according to the teachings of the invention
• FIG. 3 illustrates a step of manufacturing a wire with flats.
• FIG. 1 shows in section the stator 2 of an alternator.
• This stator 2 comprises a body 4 of generally cylindrical shape with an axis corresponding to the axis of rotation of the alternator.
• the body 4 is formed of a stack of sheets along the same axis (and is therefore sometimes referred to as a bundle of sheets).
• the body 4 has a plurality of longitudinal notches 6 at its inner wall. Each notch 6 extends in a main direction substantially parallel to the axis of the body 4 (which corresponds as already seen to the axis of rotation of the rotating machine).
• the body 4 shown in FIG. 1 defines precisely forty-eight notches 6.
• Each notch 6 receives a plurality of conductive segments 8 arranged as described hereinafter with particular reference to FIG. 2 and which form the winding carried by the stator 2.
• This winding is for example of the three-phase type. Alternatively, it could be a three-phase or hexaphase or heptaphased double winding.
• the winding implemented here is for example of the corrugated type, that is to say in which the winding segments received in a notch extend to remote notches (different notches immediately adjacent to the notch concerned).
• FIG. 2 represents a detailed view of the stator of FIG. 1 at a notch 6.
• the body 4 forms at this point two lateral walls 10, 11 which define the lateral extension of the notch, as well as a bottom wall 12 which therefore extends essentially over a circumference of the body 4, as opposed to the emerging region of the notch 6.
• End pads 14, 15 are further provided in extension of the side walls 10, 11 and at the region of the emerging region of the notch 6 so as to further reduce the cross-sectional width of this emerging region.
• the body 4 is covered with paper, except at the free end of the end pads 14, 15, as can be seen in FIG. 2.
• the notch 6 shown in FIG. a plurality of conductive segments (here nine segments). These segments are for example copper son covered with an insulator.
• the son used here are of relatively large diameter (generally greater than 1, 5 mm) relative to the width of the notch to allow the circulation of a significant electrical intensity (and therefore power).
• wires of 1, 6 mm in diameter referenced B in FIG. 2
• wires of 1, 7 mm in diameter referenced A
• each of the wires is formed from a wire of circular section (cylindrical wire) but has been deformed so as to have two parallel flats.
• the wires thus have a reduced width (here about 1.35 mm, that the initial diameter is 1.6 mm or 1.7 mm) which corresponds to the distance separating the two flats.
• the son 8 can be wound in the notch 6 with their flats essentially parallel to the side walls 10, 1 1 (i.e. substantially radial with respect to the body 4) so that a row of three son contains in a width of the notch 6 (i.e. on the same circumference of the body 4).
• the eleven son 8 received in the notch 6 are thus organized in the form of four rows (including three rows of three threads).
• Such compact arrangement of the son (or conductive segments) 8 in the notch 6 allows the positioning of a notch wedge 16 between the end pads 14, 15 and the nearest leads of the emerging region of the notch 6, despite the relatively large diameter of the son used.
• the shim 16 used here is a U-shaped wedge whose arms are turned towards the conductive segments of the notch and whose base closes the emergent region.
• it could be a flat wedge.
• the use of a single reduced width for the segments (distance separating the flats), as proposed in the present example, also makes it possible to simplify the tooling, especially for forming and inserting the conductive segments.
• wires having different diameters has been described above, but only one wire diameter can be used.
• wires of fixed diameter or of a plurality of diameters it will be possible to use wires having different widths after crushing (that is to say wires whose distance separating the flats may vary from one thread to another). It will thus be possible, for example, to use wires having a first width at the bottom of the notch and wires having a second width, smaller than the first width, in regions that are closer to the emergent region so as to adapt to the variable width of the notch mentioned above.
• the flats formed on the conductive segments 8 received in the notches 6 are for example made by deformation of son circular section by passage between two cylinders 20 (see Figure 3).
• the flats can be formed along the entire length of the winding wires.
• the flats may only be formed for the parts of wires intended to be received in notches 6, and not for example for the portions of wires intended to form the buns (that is to say parts of winding connecting the segments of a notch to those of another notch).
• the formation of radial flats at the segments 8 located in the notches 6 allows better storage thereof within the notches, while the presence of circumferential flats outside the notches allows a good compactness of the buns that connect the different notches.
• the winding consists of son preformed in a previous step (before mounting on the body 4), for example by passage between two cylinders as already mentioned.
• the winding can be deposited phase by phase, or prepared and then deposited at once within the notches (mono-insertion technique).

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Windings For Motors And Generators (AREA)
• Manufacture Of Motors, Generators (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38293700

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Family Cites Families (5)

• 2006
  • 2006-12-19 FR FR0655637A patent/FR2910195B1/fr active Active
• 2007
  • 2007-12-10 EP EP07871903A patent/EP2100359A2/de not_active Withdrawn
  • 2007-12-10 WO PCT/FR2007/052471 patent/WO2008087310A2/fr not_active Ceased

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events