Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
  • H02K13/02—Connections between slip-rings and windings
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
  • H02G3/30—Installations of cables or lines on walls, floors or ceilings
  • H02G3/32—Installations of cables or lines on walls, floors or ceilings using mounting clamps
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
  • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Definitions

• the present invention relates to an electrical rotor winding end wire retention system.
• a rotor is for example a claw rotor belonging to an electric machine forming an alternator or an alternator-starter or a vehicle propulsion motor supplied by a voltage of 12V or 48V.
• the electric rotor winding can then form the excitation coil of this rotor.
• Each support system comprises a body within which is provided a housing receiving one of the end wires.
• the housing extends between two side walls connected to each other by a bottom wall for the housing, and this housing opens outwards through an opening formed between two retaining walls, each retaining wall respectively projecting from a side wall. .
• the retaining walls In a plane perpendicular to the longitudinal axis of the housing, the retaining walls have the same shape.
• Such a clip is for example known from application EP 3 028 373.
• the object of the invention is to meet this need and it achieves this, according to one of its aspects, with the aid of a retaining system for an electric rotor winding end wire, the system comprising a housing for receiving the wire, this housing extending between two side walls interconnected by a bottom wall for the housing, and this housing opening outwards through an opening made between two retaining walls, each retaining wall s 'extending respectively projecting from a side wall and, in a plane perpendicular to the longitudinal axis of the housing, the retaining walls having a different shape from each other.
• the housing may, in the plane perpendicular to its longitudinal axis, have an axis of symmetry and this axis of symmetry may not intersect the opening made between its retaining walls.
• One of the retaining walls may project from a first side wall over a first length and the other of the retaining walls may project from a second side wall over a second length, less than the first. length.
• the longest leg thus promotes maintenance of the end wire in the housing by extending above the central zone of the housing, when observed in the plane perpendicular to its longitudinal axis.
• the length of the retaining wall can be defined, in the plane perpendicular to the axis of the housing, as being the length measured along this retaining wall, whether the latter is rectilinear, or formed by a broken line or having a other form.
• each retaining wall may comprise a proximal part originating at the level of a side wall and a distal part, the free end of which defines an edge of the opening, the proximal part and the distal part not being aligned with one another, the distal part in particular approaching the bottom wall of the housing when one approaches its free end.
• the distal part can thus form an inwardly curved part, when viewed in the plane perpendicular to the longitudinal axis of the housing.
• the length of the proximal part may be different from one retaining wall to another.
• the difference in shape from one retaining wall to the other can thus only be due to a difference in length between proximal parts.
• the distal portions may have the same length from one retaining wall to the other.
• the difference in the length of the proximal portions contributes to obtaining different shapes for the retaining walls without being the sole cause.
• the length of the proximal part may be the same from one support wall to another, but the length of the distal part of one of the support walls is greater. to that of the distal part of the other of the retaining walls.
• each retaining wall comprises a distal portion and a proximal portion not aligned with one another
• each of these retaining walls in the same plane perpendicular to the longitudinal axis of the housing, may have its proximal portion and its distal portion each extending rectilinearly so as to define an angle between them.
• the angle can be constant from one retaining wall to the other, for example having a value between 10 ° and 60 °. Such an angle value can promote entry of the end wire into the housing from the outside.
• the above angle value corresponds to the state of no deformation when the end wire is introduced into the housing through the opening.
• the angle value may differ from one retaining wall to another.
• the difference in shape between these two retaining walls can thus be caused, exclusively or partially, by this difference in angle value.
• one of the retaining walls does indeed have a proximal part and a distal part as mentioned above, these parts forming an angle between them, but the other retaining wall comprises only a single part which is rectilinear between its birth from the side wall and its free end defining an edge of the opening. This single part may or may not be directed towards the interior of the housing.
• none of the holding walls has a proximal part and a distal part as mentioned above, each holding wall is formed only by a single part which is rectilinear between its origin from the side wall and its free end defining an edge of the opening. This single part may or may not be directed towards the interior of the accommodation.
• the support system may be in one piece, being made of plastic, for example of polymer, or being made of composite material.
• the retainer system may be configured to receive within the housing a single rotor electric winding end wire.
• Another subject of the invention is a set comprising:
• the system housing can accommodate a single end wire of an electric rotor winding.
• the ratio in a plane perpendicular to the longitudinal axis of the opening between the size of the opening and the diameter of the wire can be between 0.5 and 1.
• the holding element can thus be used with wires of different diameters, thus having a "standard".
• the ratio between the first length, that is to say the length of the longest retaining wall, and the diameter of the wire may be greater than 1, in particular be between 1.1 and 1.3, being by example equal to 1.2 with a tolerance of 1 mm for this length. These ratio values can make it possible to favor the positioning of the wire against the longest retaining wall.
• the ratio between the thickness of the retaining wall having the first length and the diameter of the wire can be between 0.4 and 0.5, for example with a tolerance of 1 mm for this length.
• an electric machine rotor comprising:
• an electrical winding mounted via the interposition of a coil insulator around the shaft and disposed axially between the first and second pole wheels, and at least one retaining system as defined above, carried by the coil insulator and maintaining in the housing an end wire of the electrical winding, in particular only one end wire of this electrical winding.
• the holding system is for example made in one piece with the coil insulation.
• the holding system is attached, for example fixed or placed, on this coil insulator.
• this retention system can be rigidly fixed to this coil insulation.
• the electrical winding forms, for example, the excitation winding of the rotor.
• the rotor is advantageously a claw rotor, that is to say a rotor whose poles are in the form of claws.
• Each of the pole wheels which are then arranged in an opposite and nested manner, then comprises claws.
• Each claw of a pole wheel extends towards the other pole wheel and is inserted between two consecutive claws of the opposite pole wheel.
• the claw rotor has magnetic parts, and the electric winding.
• the rotor may include magnets, arranged between the magnetic poles formed by the claws, and serving to prevent the magnetic flux from passing directly from one pole to the other without passing through the stator.
• the rotor can be associated with fans, mounted around the rotation shaft on either side of the pole wheels to cool the electrical winding.
• the electrical winding of the rotor comprises two end wires which are for example connected to slip rings on which brushes rub to supply this electrical winding.
• Each end wire is for example bent at the top of the electrical winding and passes through a radial cavity, formed between a wall of a pole wheel and a recess of the fan, and an axial cavity, formed between the shaft and a recess of the fan.
• the retaining system can be arranged in the radial cavity formed between the wall of the pole wheel and the recess of the fan or formed between the wall of the fan and a recess in the pole wheel.
• a fold line within the retaining system may be provided, in order to modify, during the positioning of the retaining system in the rotor, the shape of this retaining system.
• FIG. 1 shows an example of a rotor in which the holding systems according to the invention can be implemented
• FIG. 2 shows a holding system according to an example of implementation of the invention
• FIG. 3 shows a detail of the holding system of Figure 2
• - Figure 4 illustrates the insertion of an end wire of the rotor excitation electric winding in the housing of the holding system of Figures 2 and 3
• FIG. 6 schematically shows a variant of the holding system.
• FIG. 1 An electric machine 10 provided with a claw rotor 20 fixed to a drive shaft 21 of axis A.
• the shaft 21 is mounted to rotate freely relative to a stator (not shown) by bearings 19.
• the rotor 20 comprises in the example considered a coil insulator 17.
• This insulator is substantially cylindrical and is here mounted integral in rotation on a core 27 mounted on the central section of the shaft 21, and it is clamped axially between two wheels. poles 25, 26.
• this coil insulator plays the role of supporting the electrical excitation winding of the claw rotor. It isolates this electrical winding.
• each of the pole wheels 25, 26 comprises a series of claws 12, 13 which are for example twelve in number for each of the pole wheels 25, 26 and which are distributed angularly in a regular manner around the common axis A to the pole wheels 25, 26 and to the shaft 21.
• Each of the claws 12, 13 of a pole wheel 26, 25 extends axially towards the other pole wheel 25, 26 facing each other, so that the claws 12, 13 are nested in one another.
• two fans 31, 32 are mounted integral around the shaft 21 and attached to the pole wheels 25, 26 to facilitate the circulation of air in the electric machine comprising the rotor.
• the electrical winding 17 is produced using turns of an electrically conductive wire, such as a copper wire, so as to form layers of conductive wire superimposed radially.
• the conductive wire is coated with at least one layer of electrically insulating material.
• the electrical winding 17 comprises two end wires 15, 16 connected to a collector provided with two slip rings 28, 29 on which brushes rub to supply this electrical winding 17.
• the connection between the end wires 15 and 16 and slip rings 28, 29 respectively is produced as can be seen in Figure 1 by conductive blades which are arranged in recesses of the shaft 21.
• Each end wire 15, 16 is bent at the top of the coil 17 and passes through a radial cavity 35, 36, formed between the first pole wheel 25 and the fan 31, then is connected to said conductive blades.
• Passages 37 and 38 are arranged between the shaft 21 and the fan 31.
• the passages 37, 38 are made by recesses 41, 42 of the fan 31.
• the radial cavities 35, 36 are produced by recesses 39, 40 of the fan 31, each recess 39, 40 forming a radial tunnel.
• the radial cavities 35, 36 can be produced by recesses in the first pole wheel 25.
• each retaining system 11 makes it possible to maintain a respective end wire 15, 16 in the radial cavity 35, 36 between the first pole wheel 25 and the fan 31.
• Each retaining system 11 is integral with the coil insulator, being for example attached to this insulation or produced in one piece with the latter.
• Each retaining system 11 can include a fold line so as to be folded over the first pole wheel 25 when mounting the claw rotor 20.
• the fan 31 which is the one facing the slip rings 28, 29 comprises two radial recesses 39, 40 intended to form the radial cavities 35, 36 between the wall 48 of the first wheel pole 25 and fan 31.
• each radial recess 39, 40 has an ogive shape and a depth adapted to the holding system 11.
• the fan 31 also comprises two axial recesses 41, 42 of semi-circular shape, the radius here is greater than the radius of the end wire 15, 16.
• Each axial recess 41, 42 is intended to form the axial cavities 37, 38 for the passage of an end wire 15, 16.
• the holding system 11 defines a housing 50 for receiving one of the end wires 15, 16.
• This housing 50 extends between two side walls 52 which are interconnected by a wall. bottom 53 for the housing 50.
• the holding system 11 is here in one piece and it can be made of polymer or composite material.
• this housing opens outwardly through an opening 54 formed between two retaining walls 55, each retaining wall 55 respectively projecting from a side wall 52.
• the retaining system 11 still bears low walls visible in FIG. 2 and arranged in a manner aligned with the side walls 52.
• the retaining walls 55 in a section plane perpendicular to the longitudinal axis X of the housing 50, the retaining walls 55 have a shape different from each other. It can be seen in particular in FIG. 3 that the housing 50 has an axis of symmetry Z in the aforementioned section plane and that this axis of symmetry does not intersect the opening 54 in the example described.
• each retaining wall 55 defines in the aforementioned plane a broken line, being formed by a proximal part 60 originating on the corresponding side wall 52 and by a distal part 61 which extends the proximal part 60 in the direction of inside the housing 50 and which has a free end. It can be seen that for each retaining wall 55, the proximal part 60 and the distal part 61 are rectilinear and define between them an angle ⁇ . In the example under consideration, this angle a is constant from one retaining wall 55 to the other and has a value of between 10 ° and 60 °.
• one of the retaining walls 55 has a length, equal to the sum of the length measured along its distal part 61 and the length measured along its proximal part 60, which is greater than the corresponding length of the other retaining wall 55, thus conferring in the aforementioned plane a different shape between the retaining walls 55.
• This difference in shape is here caused by the greater length of one of the proximal parts 60 while the distal portions 61 have the same length.
• the ratio between the length of the longest retaining wall 55 and the diameter of the end wire a value of the order of 1.2, with a tolerance of 1 mm for this length. It is also possible to choose for the ratio between the thickness of the retaining wall 55 of greatest length and the diameter of the end wire a value between 0.4 and 0.5, with a tolerance of 1 mm for this length. .
• the invention is not limited to what has just been described.
• FIG. 6 represents, similarly to FIG. 2, a variant in which none of the retaining walls 55 has a proximal part and a distal part as mentioned above.
• each retaining wall 55 is formed only by a single part which is rectilinear between its origin from the side wall 52 and its free end defining an edge of the opening 54. This single part may or may not be directed. towards the inside of the housing 50, for example making an angle of between 10 ° and 60 ° towards the inside of the housing 50, to promote entry of the end wire 15, 16 into the housing 50 and make it more difficult to output of the wire from this housing.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Power Engineering (AREA)
• Insulation, Fastening Of Motor, Generator Windings (AREA)
• Windings For Motors And Generators (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=67441418

Family Applications (1)

Country Status (5)

Family Cites Families (5)

• 2019
  • 2019-04-03 FR FR1903555A patent/FR3094850B1/fr active Active
• 2020
  • 2020-03-25 CN CN202080026152.2A patent/CN113692689A/zh active Pending
  • 2020-03-25 JP JP2021558909A patent/JP2022526583A/ja not_active Withdrawn
  • 2020-03-25 WO PCT/EP2020/058412 patent/WO2020200973A1/fr unknown
  • 2020-03-25 EP EP20712394.4A patent/EP3949091A1/de not_active Withdrawn

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