FR3003706A1 - SEPARATION SEGMENT FOR ASSEMBLING A STATOR OR ROTOR OF AN ELECTRIC MACHINE AND METHOD FOR MANUFACTURING THE SAME - Google Patents

Abstract

Toothed segment (2) for assembling a stator (1) or a rotor having a tooth support segment (3) in the tangential direction (18) and a tooth (4) in the radial direction (19). ). The segment is assembled to form the ring of the stator (1) or the rotor. The first end (34) of the segment (3) in the tangential direction (18) is shaped as an assembly part (5) and the second end (35) has a form of complementary assembly part (6). The assembly part (5) and / or the complementary part (6) comprise a housing (9) for a clamping pin (12).

Description

Field of the Invention The present invention relates to a toothed segment for assembling a stator or an electric machine rotor, the toothed segment having a tooth support segment extending in the tangential direction of the stator or rotor and having a tooth extending in the radial direction of the stator or rotor, the tooth support segment being intended to be assembled to form the outer ring of the stator or the inner ring of the rotor, a first end of the segment in the tangential direction being shaped as an assembly part and the second end of the tooth support segment having, in the tangential direction, a form of complementary part of assembly, the part of assembly and the complementary assembly part being intended to connect the toothed segments for the assembly of the stator or the rotor.

The invention also relates to a stator or rotor of an electric machine made by assembling such toothed segments. STATE OF THE ART Document EP 2 551 993 A1 describes an electric motor whose stator is subdivided into segments. The breech ring segment has at the first end, in the tangential direction of the stator, a tongue-like joint portion. The second end in the tangential direction has a complementary groove-shaped assembly part. When the stator is assembled from the stator segments, the groove and the tongue are assembled each time to obtain a rotational symmetrical stator. However, this stator has disadvantages. On the one hand, the adjustment of the tongue in the groove is done with an air gap which negatively influences the coupling torque for physical reasons. On the other hand, this stator is not rigid enough and tends to vibrate. DESCRIPTION AND ADVANTAGES OF THE INVENTION The object of the present invention is to overcome the drawbacks of known electric motors of the type defined above and thus to provide such a motor, characterized in that the assembly part and / or the part complementary assembly comprises a housing for a clamping pin. The toothed segment according to the invention for producing a stator or a rotor of an electric machine as well as the method according to the invention for manufacturing such a machine make it possible to have greater rigidity and reduced coupling torque due to the shaping of the housing of a clamping pin in the assembly part and / or in the complementary assembly part. The toothed segment comprises a tooth support segment and a tooth perpendicular to this tooth support segment. The stator tooth support segment forms a segment of the breech ring and in the case of the rotor forms a segment of the ring applied to the rotor shaft. The tooth support segment extends in the tangential direction and the tooth in the radial direction. The assembly portion is at the first tangential end and the complementary assembly portion at the second tangential end of the tooth support segment. Depressing the pin in the housing, it closes the air gap required for the assembly of the toothed segments between the assembly part and the complementary assembly part. Depressing the clamping pin causes the assembly part and / or the complementary assembly part to expand. This expansion is in the extension direction that moves radially away from the housing. The expansion produces an adjustment pressed between the assembly part and the complementary assembly part. The press fit ensures high rigidity and low latching torque because the air gap or air gap is closed. The tooth support segment has a first end in the tangential direction on which is formed the connecting portion which protrudes from the first end and has the outermost point. The complementary assembly part has the innermost point and forms a recess. In a particularly advantageous manner, the gap or air gap required for the assembly and toothed segments between the assembly part and the complementary part of assembly will be closed when the assembly part and the complementary part of assembly which are circular by segment and in particular of circular form. A round segment of the assembly part or the complementary assembly part may be formed on the segment of the assembly part or the complementary assembly part made in right flank form. It can be envisaged that the straight segment or round segment joins the tangential end of the tooth support segment. It is also possible to envisage a matter-saving variant for which the round segment directly follows the end so that there is no straight segment. The undercut portion of the assembly portion and the complementary joining portion is a particularly advantageous solution. In particular, the assembly part and the complementary assembly part, together and which have undercuts can not separate in the tangential direction because of the connection by the shape formed by the undercut. An undercut is obtained for a round segment of the joining portion and the complementary joining portion which covers an angle greater than 180 °. In particular, the assembly part has in the region of the housing a larger radial dimension than in the connection zone between the housing and the tooth support segment.

The regular closing of the air gap or air gap necessary for the assembly of the toothed segments, between the connecting part and the complementary part of assembly over the entire axial length of the tooth support segment is obtained. in that the housing is made in the form of a through hole, preferably located in the center of the particularly circular segment of the assembly part. The assembly part and the complementary part of assembly are also performed along the entire length of the tooth support segment, in the axial direction. The material surrounding the housing of the clamping spindle expands advantageously particularly if the housing is made in a round assembly part. The material expands advantageously, in particular by plastic and / or elastic deformation. The assembly part, in particular in the case of a housing installed in the center of the round assembly part, expands regularly and in the radial direction relative to the housing constituted by the through-hole. The through bore thus constitutes the housing for the clamping pin which promotes radial expansion at any point along the geometric axis of the through bore. This regular expansion ensures high rigidity and a low hanging torque.

In order to have an advantageously optimum seat of the stator in the stator housing or rotor on the rotor shaft, at least one cutting edge directed radially outwardly at the ends of the tooth support member is formed. The cutting edge is made in particular on at least one extension at the ends of the tooth support segment. The cutting edges cut radially into the stator housing or the rotor shaft by driving in the clamping pin and extending the joining part. The extension extends in the tangential direction. The extension is part of the end. The extension is on the outer radial side of the toothed segment.

Thus, thanks to their elongated shape, the extensions can be moved in the radial direction for the joining part and / or the complementary assembly part which expands. The cutting edge moves with the extension in the radial direction. The cutting edges of the extensions extend in the axial direction. This advantageously locks the stator to the stator housing. According to a preferred development, the clamping spindle is harder than the material of the assembly part or of the complementary assembly part. Such a clamping spindle is not subjected to any deformation such as folding, bending, pulling of pieces by sharp edges, and plastic deformation of the clamping spindle at the moment of insertion. The clamping spindle is at least as long as its housing and it has a fillet on one side. The side with leave forms including a point which facilitates the depression in the housing. Instead of the tip can also have a rounded part that also facilitates the depression. In order for the material surrounding the housing to expand sufficiently, the spindle must have a larger diameter than the housing. The invention also relates to a method of producing an electric machine preferably with a toothed segment or a rotor or a stator, consisting in producing a toothed segment, in particular in cut sheet metal, having an assembly part and a complementary part of assembly, to assemble the toothed segments to form a stator or a rotor by the interlocking of the connecting parts and complementary parts of assembly of two adjacent toothed segments, and to push the clamping pin into the housing made in the assembly part. The production method according to the invention consists in particular of making toothed segments for an electric machine by stamping sheet metal strips. The toothed segments are assembled to form a stator or rotor by interlocking the connecting portions and complementary joining portions of two adjacent toothed segments. The optimum stiffness of the rotor stator results from the advantageous insertion of the clamping pins into the housings.

The clamping pin is driven by a sliding tool with jaws to guide the clamping pin. The sliding tool or pushing tool presses the clamping pin, by repeated strokes, in the housing. Depressing is done by small strokes to prevent the clamping pin from deforming or bending or bending or even sharp edges remove chips or the pin undergoes plastic deformation. For this, the cutting tool executes an axial driving stroke towards the housing. For the driving stroke, the clamping pin is tight in the jaws. After having pushed the clamping pin at least partially into the housing by a driving stroke, the jaws are opened. The jaws being open, the thrust tool runs backwards relative to the housing. Arrived at the starting point at the beginning of the previous step, the thrust tool repeats the same driving cycle as described above. This allows the clamping pins to be pushed in gently. By the method step of driving the clamping pin, pressing the assembly part against the complementary assembly part and the extension. The assembly part and the complementary assembly part thus form a pressed fit and these two parts are integrally connected. The extension moves in the radial direction. The cutting edges of the extensions are thus moved towards the stator housing or the rotor shaft. The cutting edges notch the stator housing or the rotor shaft and block the toothed segments, assembled and ensure their centering. In particular, a very strong connection is made with the stator housing or the rotor shaft, if at the edges of the cutting edges there is a profile which improves the making of the cuts by the cutting edges. Preferably, only the clamping pin is depressed when the toothed segments are in the stator housing and / or on the rotor shaft which ensures optimum seating for the assembled toothed segments. Drawings The present invention will be described hereinafter in more detail with the help of a toothed segment for the assembly of a stator or an electric machine rotor and a method of producing an electric machine. with the aid of such toothed segments, shown in the accompanying drawings in which: - Figure 1 is a schematic view of an embodiment of a toothed segment with a toothed segment and ends defined by boundary surfaces; FIG. 2 is a section of a toothed segment, wound, according to the invention for a stator according to the invention; FIG. 3 shows toothed, wound and assembled segments according to the invention in a stator housing; Figure 4 shows the depression of clamping pins by a push tool in a stator according to the invention formed of toothed segments. DESCRIPTION OF EMBODIMENTS OF THE INVENTION FIG. 1 shows a first end 34 and a second end 35 delimited by boundary surfaces 25, 26. Thus, one end 34, 35 has an end edge and the tooth support segment 3 inside two boundary surfaces 25, 26, radial, parallel to the axis of the stator or to the axis of the rotor. The boundary surfaces 25, 26 intersect at the center of the stator 1 from which they are derived. The end edge is not part of either the radial outer side 30 or the inner radial side 31 of the tooth support segment or tooth 4. The end edge is between the outer radial side 30 and the radial side. The end surfaces 25, 26 are tangent to the end points 32 of the tooth support segment 3 and they are also tangent to the innermost points 33 of the edge. The outermost point 32 is furthest from tooth 4 in the tangential direction 18. The outermost point 32 is on the outer boundary surface 26. The innermost point 33 is located in the tangential direction 18, opposite, as far inside the tooth support segment 3 as a radial and axial section containing the innermost point 33 in the tooth support segment 3 develops a surface without hole, simply consistent. The simply coherent, hole-free surface is at the same time also the lower boundary surface 25. This merely coherent, hole-free surface has, in addition, at the edge, no recess whose concave edge has an angle greater than 180 °. . The edge 29 of the assembly part or the edge 38 of the complementary assembly part surround the assembly part 5 and the complementary assembly part 6, to join the end edge of the tooth support segment 3. The edge 29 of the assembly part and the edge 38 of the complementary assembly part thus form part of the end 34, 35 and the segment of the end edge. The edge 29 of the assembly part and the edge 38 of the complementary assembly part have the same shape and the same ratio of the lengths but the assembly part 5 is smaller than the complementary part of assembly 6. Between the assembling parts 5 and complementary assembly 6 engaged one into the other, there is an air gap 16 because of the dimensional difference. The assembly part 5 and the complementary assembly part 6 have only rounded segments. The rounded segments directly join the ends 34, 35 of the tooth support segment 3. The joining part 5 is a convex segment 37 of circular shape, located tangentially further outwards and joining two concave segments 36 adjacent to each other. themselves without discontinuity, the rest of the end edge. The measurement 39 of the shortest link between the two concave segments 36 is smaller than the diameter 28 of the convex segment 37 of circular shape. The convex segment 37 of circular shape corresponds to an angle greater than 180 °. We have an undercut. The complementary part of the assembly 6 is formed according to the assembly part 5. In the assembly part 5 a new housing has been made as a through-hole. The end 34, 35 may also have other shapes such as extensions 8, 8 ', cutting edges 7, 7' which are housed on or in an end 34, 35. Figure 2 shows a toothed segment 2 according to the invention. The toothed segment 2 is intended to be joined to other toothed segments to form a stator 1. The toothed segment 2 comprises a tooth support segment 3 according to FIG. 1 with a tooth 4 directed transversely towards its inner side. The tooth 4 is surrounded by an insulating mask 10 receiving a winding 11. The first end 34 of the tooth support segment 3 has an assembly portion 5, formed, which extends beyond the end edge. The second end 35 of the tooth support segment 3 has a complementary assembly portion 6 forming a recess. The ends 34, 35 of the tooth support segment 3 each have an extension 8, 8 ', produced by molding and whose edge joins without interruption the residual end edge and thus the edge of the connecting part 5 or of the complementary assembly part 6. The complementary assembly part 6 and the extension 8 'divides the common edge 40 directed radially inwards. The extension 8 is an integral part of the complementary part of assembly 6. The extensions 8, 8 'are radially further outside than the assembly part 5 and the complementary part of assembly 6. The extensions 8, 8 'move away from the tooth 4 in the tangential direction 18. The extension 8' of the second end 35 has a recess 27 formed at the end 34 between the joining part 5 and the extension 8 and which can be received in a manner adjusted by this recess 27.

The extensions 8, 8 "have radially outwardly directed cutting edges 7, 7 'extending in the axial direction 17. FIG. 3 shows the detail of an assembled stator 1, formed of toothed segments 3, such as that of FIG. 21, placed in a stator housing 20. Between the assembly part 5 and the additional assembly part 6 there is an air gap 16. When a clamping pin is 12 is forced into a housing 9, the air gap 16 closes as it appears in the arrangement to the left of the assembly part / complementary assembly part.The force depression increases the dimensions of the part of assembly 5 and pushes against the complementary assembly part 6 because the clamping pin 12 has a greater diameter than the housing 9. The thrust of the assembly part 5 against the complementary assembly part 6 is reflected by an adjustment The thrust of the connecting part 5 against the complementary assembly part 6 presses the extensions 8, 8 'radially against the housing 20 of the stator. On the other hand, because of their elongated shape, the extensions 8, 8 'move easily in the radial direction 19. This radial movement allows the cutting edges 7, 7' to make notches in the stator housing 20.

Thus, the entire stator 1 is integrally locked in the axial direction 17. The stator 1 is centered by the cutting edges 7, 7 'acting in the radial direction 19. The cutting edges 7, 7' block the stator 1 in rotation in the tangential direction 18 in the stator housing 20. The average arrangement of the assembly part / complementary assembly part according to FIG. 3 shows another advantageous development according to which the extension 8 'is provided with a stop. cutting 7 '. The assembly part 5 of this embodiment has for example a slot 22 as a housing 8 for a clamping pin 12 of flat shape. The flat-shaped clamping pin 12 may be a wedge or tongue. The flat-shaped clamping pin 12 must be slightly larger than the slot 22. The flat-shaped clamping pin 12 moves the slot 22 to the press fit of the assembly part 5 in the complementary part of assembly 6. The assembly part / additional right-hand assembly part according to FIG. 3 shows a third advantageous embodiment with only an extension 8 'without cutting edge 7'. Before the assembly of the toothed segment 2, insulating masks 10 are installed on the teeth 4 and the windings 11 are wound on the insulating masks 10.

FIG. 4 shows the operation of driving the clamping pins 12 into the housings 9 of a stator 1 assembled according to FIG. 3. The clamping pins 12 are driven by means of a sliding tool 13. sliding tool 13 comprises jaws or jaws 14, 15. The clamping pins 12 are clamped between the jaws 14, 15. The jaws 14, 15 have shoulders 21 projecting axially in the direction of the stator 1. The shoulders 21 have a passage for the clamping pins 12. The shoulders 21 may be partly on the jaw 14 and partly on the jaw 15. The shoulders 21 are thus at least divided in two. The insulating masks 12 cover the end faces 41 of the toothed segments 2 and protrude axially from the end faces 41 of the toothed segments 2. The pinches 12 pinched can thus be guided by each shoulder 21 between the insulating masks 10 into each toothed segment 2 .

According to another embodiment of the shoulder 21, it has a channel shape in one piece. The channel-shaped shoulder or recess is an elongated body open in the axial direction. The channel-shaped shoulder is hollow and the cavity extends in the axial direction, especially as an axial bore passing through the channel-shaped shoulder. The channel-shaped shoulder may have a closed envelope surface or an envelope surface with an aperture of any shape and size. The jaws 14, 15 may themselves be elongated bodies in the axial direction. The jaws 14, 15 and / or the shoulders 21 are on a disc 24 which preferably comprises at least one device formed of jaws and detents. The number of jaw / recess devices on the disk 24 corresponds to the number of slots 9 and / or slots 22 so that all the clamping pins 12 can be depressed simultaneously. The disk 24 has through orifices 23 or conically shaped depressions. The disc 24 can be replaced by a ring so that the through holes 23 are no longer necessary. The jaws 14, 15 and / or the recesses or shoulders are formed on the ring. It should be noted that the invention applies not only to a stator 1 but also to a rotor. Through-hole 9 and slot 22 can be combined and modified in any way. The device, assembly part / complementary assembly part can be made without extension or with an extension 8 or 8 'or with both extensions 8 and 8'. Extensions 8, 8 'may or may not have cutting edges 7, 7'. In addition, a tooth support segment 3 may have more than one tooth 4. Similarly, the teeth 4 may not be wound. The electric machine is advantageously applied to actuators of a motor vehicle, in particular for power steering, without this application being limiting.10 NOMENCLATURE OF THE MAIN ELEMENTS 3 tooth support segment 4 tooth 5 assembly part 6 complementary part d 7, 7 'Cutting edges 8, 8' Extensions 9 Housing 10 Insulating mask 11 Winding 12 Clamping pin 13 Pushing tool and / or sliding tool 14, 15 Jaws 16 Air gap 17 Axial direction 18 Tangential direction 19 Radial direction Housing stator 20 21 shoulder / recess 22 slot 23 through hole 24 disc 25, 26 limit surfaces 27 recess 29 edge of the connecting part outer radial side 31 inner radial side 32 outermost point of the tooth support segment 30 33 Tangentially innermost point in the tooth segment 34 First end Second end 36 Concave segment 35 37 Segment con vexe 38 Edge of the complementary part of assembly 39 Shortest connection between the two concave segments 36 40 Common edge 41 Front face 10

Claims (3)

CLAIMS1 °) Toothed segment (2) for assembling a stator (1) or an electric machine rotor, the toothed segment (2) having a tooth support segment (3) extending in the direction tangential (18) of the stator (1) or the rotor and a tooth (4) extending in the radial direction (19) of the stator (1) or rotor, the tooth support segment (3) being intended to be assembled to forming the outer ring of the stator (1) or the inner ring of the rotor, a first end (34) of the tooth support segment (3) in the tangential direction (18) being shaped as an assembly part ( 5) and the second end (35) of the tooth support segment (3) having in the tangential direction (18) a form of complementary part of assembly (6), the assembly part (5) and the part complementary assembly (6) being intended for connecting the toothed segments (2) to assemble the stator (1) or the rotor, characterized in that the connecting part (5) ) and / or the complementary assembly part (6) comprise a housing (9) for a clamping pin (12). 2 °) toothed segment (2) according to claim 1, characterized in that the connecting portion (5) and the complementary portion of assembly (6) having at least in segment, a rounded shape, in particular a circular shape. 3 °) toothed segment (2) according to claim 1, characterized in that the rounded segment of the connecting portion (5) and that of the complementary portion of assembly (6) extend over an angle greater than 180 .354 °) toothed segment (2) according to claim 1, characterized in that the housing (9) is an axial bore passing through the connecting part (5) preferably in the center of the connecting part (5). . 5 °) toothed segment (2) according to claim 1, characterized in that the connecting part (1) and the complementary part of assembly (6) extend over the entire length of the tooth support segment (3) in the axial direction (17). 6 °) toothed segment (2) according to claim 1, characterized in that at the depression of a clamping pin (12) in the housing (9), the connecting portion (5) expands to the point axial axis of the longitudinal axis of the housing (9) radially outwardly away from the housing (9). 7 °) toothed segment (2) according to claim 1, characterized in that the first and / or second end (35) of the tooth support segments (3) have on the side of the tooth support segment (3) opposite the tooth (4), a cutting edge (7, 7 ') for locking the toothed segment (2) in the stator housing (20) or on the rotor shaft at the first and / or second end (35) of the tooth support segment (3). 8 °) toothed segment (2) according to claim 1, characterized in that the first end (34) and / or the second end (35) of the tooth support segment (3) comprises an extension (8, 8 ') formed in the tangential direction (18), the cutting edge (7, 7 ') being provided on the extension (8, 8') in the axial direction (17) .359 °) Toothing segment (2) according to claim 1 having a clamping pin (12), characterized in that the clamping pin (12) is pressed into the housing (9) and extends over the entire axial length of the housing (9). 10 °) toothed segment (2) according to claim 1 with a clamping spindle (12), characterized in that the clamping spindle (12) has a greater diameter than that of the housing (9). 11 °) toothed segment (2) according to claim 1, comprising a clamping spindle (12), characterized in that the clamping spindle (12) has a fillet at one end which forms in particular a point and is made preferably a hard material, the hardness of which is greater than that of the material of the connecting part (5) and / or the complementary part of assembly (6). 12 °) Rotor or stator (1) of electrical machine which is composed of the assembly of a set of toothed segments (2) and clamping pins (12) according to any one of claims 1 to 11 13 °) A method of producing an electric machine preferably with a toothed segment according to one of claims 1 to 11 or a rotor or a stator according to claim 12, characterized by the following steps of: making a toothed segment (2) in particular cut sheet metal having an assembly part (5) and a complementary assembly part (6), assemble the toothed segments (2) to form a stator (1) or a rotor by the interlocking parts assembly (5) and complementary assembly parts (6) of two adjacent toothed segments (2), press the clamping pin (12) into the housing (9) formed in the connecting part (5). 14 °) A method of producing an electric machine according to claim 13, characterized in that the clamping pin (12) is pushed into the housing (9) by means of a sliding tool ( 13) comprising jaws (14, 15) for guiding the clamping spindle (12), the sliding tool (13) pushing the clamping spindle (12) step by step, by repeated strokes. 15 °) A method of producing an electric machine according to claim 13 or 14, characterized by axially mounting the assembled toothed segments (2) in the stator housing (20) or on the rotor shaft, the driving of the clamping pin (12) in the housing (9) is made by pressing the assembly part (5) between the complementary assembly part (6) and in particular the cutting edges (7, 7 ') formed on the tooth support segments (3) in the stator housing (20) or in the rotor shaft.