FR2708397A1 - Armature of rotating electric machine comprising a drum type collector. - Google Patents

Abstract

The invention provides an armature (10) of a rotating electrical machine of the type comprising a rotor (12) which carries a winding whose conductors (16) are connected to a drum-type collector (22) which carries a series of conductive blades ( 30) arranged axially at the periphery of a hollow cylindrical body of insulating material (24) carried by one end (20) of the rotor shaft and which comprises means for lateral holding in position of the conductors (16) facing the associated slats (30) to which they are connected, characterized in that said retaining means comprise a series of axial retaining lugs (40) made of insulating material, each of which extends between two adjacent slats (30) to form an insulating partition, each pair of adjacent legs (40) defining an axial notch (46) which receives a conductor (16). Application in particular to the production of an armature for a motor vehicle starter.

Description

The present invention relates to an armature of

rotating electric machine.

  The invention relates more particularly to an armature comprising a rotor which carries a winding whose conductors are connected to a drum-type collector which carries a series of conductive blades arranged axially at the periphery of a hollow cylindrical body of insulating material carried by a

end of the rotor shaft.

  The operations of welding the conductor wires of the armature winding on the blades of a drum-type collector without a collar present

significant difficulties.

  Indeed, the ends of the conductors to be welded on each blade must be held laterally in a position which is that desired for a setting

correct collector.

  In order to avoid lateral sliding of the conductor relative to the associated strip on which it is to be welded, during the welding operation which is often carried out by electric welding with or without the addition of solder, it has already been proposed to provide lateral holding means in position of the conductors opposite

blades.

  According to a known technique illustrated in document FR-A-2,639,163, these lateral holding means can consist of heels arranged in a ring around the collector, each of which extends radially a collecting blade, in the vicinity of one of its axial ends , a truncated V-shaped notch being formed in each heel to be able to receive and laterally hold the conductor associated with the blade. According to a known technique, each retaining heel is made integrally with the associated collecting blade and the cost price of such a design is particularly high because it requires the use of a larger amount of copper.

  for making the heels of the blades.

  In addition, copper heels are adjacent conductive parts which present significant risks of short circuits in the event of deformation.

  mechanical and / or thermal during welding operations.

  The object of the invention is to propose an armature design of a rotary electric machine of the type mentioned above, which overcomes the drawbacks which

have just been mentioned.

  For this purpose, the invention provides a machine armature characterized in that the lateral support means for the conductors comprise a series of axial lugs made of insulating material, each of which extends between two adjacent blades to form an insulating partition, each pair of adjacent legs delimiting a notch

axial which receives a conductor.

  According to other characteristics of the invention:

  - each leg extends circumferentially au-

  above the parallel edges of the two adjacent blades; each leg extends axially from a radial end face of the rotor over a part of the axial length of the manifold; - The retaining tabs are connected together in the vicinity of one of their axial ends by a connecting ring to form a retaining sleeve mounted on the manifold; - Means are provided for angular indexing of the retaining sleeve relative to the manifold; - The body of the manifold has at one of its ends a cylindrical extension which receives the connecting ring of the retaining sleeve; - The indexing means are means of indexing by cooperation of complementary shapes arranged respectively on the peripheral surface of the cylindrical extension of the body of the manifold and in the internal surface portion facing the connection ring; - The peripheral surface of the cylindrical extension of the manifold body has "n" axial ribs and the internal surface portion opposite, in section through a radial plane, has the shape of a polygon with "n" sides; - the number of collector blades is equal to 21 and the number n of ribs is equal to 7; - according to a variant, the retaining tabs are produced integrally by molding with the body

collector insulation.

  Other features and benefits of

  the invention will appear on reading the description

  detailed which follows for the understanding of which reference will be made to the appended drawings in which: - Figure 1 is a partial schematic view in perspective of an armature of a rotating electric machine produced in accordance with the teachings of the invention; - Figure 2 is a side elevational view of the collector which equips the armature of Figure 1; - Figure 3 is a right side view of the collector of Figure 2; - Figure 4 is a side elevational view of the retaining sleeve which equips the armature of Figure 1; - Figure 5 is a left side view of the retaining sleeve illustrated in Figure 4; - Figure 6 is a sectional view, along line 6-6 of Figure 7, illustrating the cooperation of the angular indexing means of the holding sleeve on the manifold; and FIG. 7 is a sectional view along the

line 7-7 of figure 6.

  The armature 10 of a rotary electric machine, such as a starter, shown diagrammatically in FIG. 1, comprises a rotor 12, illustrated in silhouette, the axial notches 14 of which receive conductors, one of which 16 is illustrated in the figure 1. The rotor is extended axially beyond one of its axial end faces 18 by a shaft which

carries a manifold 22.

  The collector 22, which is illustrated in detail in FIGS. 2 and 3, essentially consists of a body 24 of insulating material, for example of molded plastic, of generally hollow cylindrical shape inside which is provided a bore 26 to allow threading of the manifold 22 on the end 20 of the shaft

armature.

  The peripheral cylindrical surface 28 of the insulating body 24 of the collector 22 receives a series of twenty-one collecting blades 30 of conductive material so as to constitute, according to a known technique, a

drum type collector.

  Each of the blades 30 extends axially substantially over the entire axial length of the insulating body 24 and are separated by axial grooves 31

(figure 3).

  The insulating body 24 is extended at one of its axial ends by a cylindrical extension 32 of smaller diameter and whose peripheral cylindrical surface 34 has seven axial ribs 36 whose

  function will be explained later.

  In accordance with the teachings of the invention, the lateral holding means of each conductor 16 are constituted by a series of axial tabs of

holding 40 of insulating material.

  In the embodiment illustrated in the figures, the axial tabs 40 are connected together by a connecting ring 42 to form a retaining sleeve 44 molded from plastic which is illustrated

in detail in Figures 4 and 5.

  As can be seen in FIG. 1, each axial tab 40 of insulating material extends axially above the parallel edges of two collecting blades

  adjacent 30 that it slightly overlaps.

  Two consecutive axial tabs 40 delimit between them an axial notch 46 which is designed to receive a conductor 16 and hold it laterally in position above the collecting blade 30 on which

it must be welded.

  The connecting ring 42 essentially comprises a radial veil 48 pierced in its center with a hole 50 for the passage of the shaft end 20 and which also comprises a hollow housing 52 whose profile, in cross section and like this is illustrated in FIG. 5, is a heptagon whose each apex angle 54 is provided to receive an angular orientation rib 36 of the extension 32 of the manifold 22 when the retaining sleeve 44 is placed in position by axial interlocking on the manifold 22 as is

illustrated in Figures 1, 6 and 7.

  The mounting and positioning of the manifold 22 and the lateral retaining sleeve 44 is carried out from the

next way.

  After having threaded the sleeve 44 on the manifold 22 and thus angularly indexed the tabs 40 relative to the collecting blades 30 so as to define a series of lateral retaining notches 46 each of which extends axially in line with a collecting blade 30 , the sub-assembly 22-44 is threaded axially on the shaft end 20 of the armature 10 until the radial end face 43 of the connection ring 42 comes to bear against the radial face

end 18 of rotor 12.

  Each conductor 16 of the armature winding can then be placed in a notch 46 in which it is held laterally to facilitate its welding operation on the collecting blade

correspondent 30.

  During the welding operation, it is arranged that, by the thermoplastic effect, the tabs 40 penetrate into the grooves 31 separating the collecting blades 30, reinforcing the insulation between said blades and preventing any projection of metal in said grooves during of

soldering the conductors.

Claims (11)

  1. Armature (10) of a rotary electric machine of the type comprising a rotor (12) which carries a winding whose conductors (16) are connected to a collector (22) of the drum type which carries a series of conductive blades (30) arranged axially at the periphery of a hollow cylindrical body made of insulating material (24) carried by one end (20) of the rotor shaft and which comprises means for holding the conductors (16) in lateral position facing the associated blades ( 30) to which they are connected, characterized in that said holding means comprise a series of axial holding tabs (40) made of insulating material, each of which extends between two adjacent blades (30) to form an insulating partition, each pair of adjacent holding tabs (40) defining an axial notch (46) which receives a conductor (16).   2. Armature according to claim 1, characterized in that each tab (40) extends circumferentially above the parallel edges of the two adjacent blades (30).   3. Armature according to one of claims 1 or 2,   characterized in that each tab (40) extends axially from the radial end face (18) of the rotor over a part of the axial length of the manifold (22). 4. Armature according to any one of   claims 1 to 3, characterized in that the legs   retaining (40) are connected together, in the vicinity of one of their axial ends, by a connecting ring (42) to form a retaining sleeve (44) mounted on the manifold (22).   5. Armature according to claim 4, characterized in that there are provided means for angular indexing of the retaining sleeve (44) relative to the collector (22).   6. Armature according to one of claims 4 or 5,   characterized in that the body (24) of the manifold has & one of its axial ends a cylindrical extension (32) which receives the ring   connection (42) of the retaining sleeve (44).   7. Armature according to claim 6 taken in combination with claim 5, characterized in that the indexing means are indexing means by cooperation of complementary shapes (36, 54) respectively arranged on the peripheral surface (34) of the cylindrical extension (32) of the body (24) of the manifold and in the internal surface portion (52) facing the connection ring (42) of the sleeve hold (44).   8. Armature according to claim 7, characterized in that the peripheral surface (34) of the cylindrical extension (32) of the body (24) of the manifold (22) has "n" axial ribs (36), and in that the portion of internal surface facing (52) of the connecting ring (42) present, in section by a radial plane,   the shape of a polygon with "n" sides.   9. Armature according to claim 8, characterized in that the number of blades (30) of the collector (22) is equal to 21, and in that the number "n" of ribs (36) is equal to 7.   10. Armature according to any one of claims 1 to 3, characterized in that the holding tabs (40) are made integrally by   molding with the insulating body (24) of the manifold (22).   11. Armature according to one of claims 1 to 3,   characterized in that the tabs (40) partially penetrate into grooves (31) separating the blades (30).