Stator of an electrical machine

Abstract

Stator of an electrical machine (2) with a stator body (3), which in particular comprises a stator laminated core, and with a stator winding (4) which runs through stator slots (5) of the stator body (3), wherein a plurality of support points (7) are formed in each of the stator slots (5), spaced apart from one another in the axial direction with respect to a stator axis (6), for clamping the conductor (8) or conductor bundle (9) of the stator winding (4) located in the respective stator slot (5), wherein at least one slot gap (10) is formed between the walls of the respective stator slot (5) and the conductor (8) or conductor bundle (9) arranged in the stator slot, which extends in the axial direction to form a slot gap channel and through which a cooling medium, in particular oil, can flow, wherein the stator body (3) comprises at least two clamping disks (12) on which clamping structures (13) are formed to form the support points (7), characterized in that the clamping structures (13) are formed by elastically deformable bead structures (13) which are axially clamped to form the support points (7) and, as a result of the clamping, are elastically displaced or deformed into the respective stator slot (5).

Description

Prior ArtThe invention is based on a stator of an electric machine according to the preamble of the main claim.A stator of an electric machine is already known from DE1020191133785 A1, having a stator body which comprises a stator laminated core, and having a stator winding which runs through stator slots of the stator body, wherein in each of the stator slots a plurality of support points, spaced apart from one another in the axial direction with respect to a stator axis, are formed for clamping the conductor or conductor bundle of the stator winding lying in the respective stator slot, wherein at least one slot gap is formed between the walls of the respective stator slot and the conductor or conductor bundle arranged in the stator slot, which slot gap extends in the axial direction, forming a slot slot channel, and through which a cooling medium, in particular oil, can flow. The stator body comprises at least two clamping disks on which clamping structures are formed for forming the supporting points.Advantages of the InventionThe stator according to the invention of an electric machine having the characterizing features of the main claim has the advantage over the related art that the conductor bundles can be introduced into the stator grooves during assembly without clamping forces. In this way, the manufacturing cost of the stator is reduced. In addition, damage to the conductor bundles during the insertion of the conductor bundles into the respective stator slots is avoided. This is achieved according to the invention in that the clamping structures are formed by elastically deformable bead structures which are axially braced to form the supporting points and, as a result of the bracing, are elastically pushed or deformed into the respective stator groove.The measures listed in the subclaims make possible advantageous refinements and improvements of the stator of an electric machine specified in the main claim.According to an advantageous embodiment, it is provided that the respective bead structure of the respective clamping disk in the non-tensioned state protrudes in the axial direction with respect to a stator axis relative to the remaining part of the clamping disk. In this way, the bead structures can be forced partly into the stator grooves under axial prestress.In particular, the respective bead structure can additionally protrude into the respective stator groove in the non-tensioned state. In this way, a preferred direction for the displacement or deformation of the bead structure is defined, so that the supporting points can be produced reliably and reproducibly.It is particularly advantageous if the respective clamping disk has a bead structure per stator groove. In this way, one support point is formed per clamping disk and per stator groove.It is very advantageous if the respective bead structure per stator slot is formed at least on two opposite slot flanks of the stator slot, in particular additionally on a slot base and / or on a slot slot. In this way, the respective supporting point can be produced reliably and reproducibly.It is furthermore advantageous if the respective bead structure is arranged on or along a groove edge of the respective stator groove. In this way, the bead structure is formed very close to the respective stator groove, so that the forming path by which the bead structure has to be displaced in order to form the support point can be kept small.According to an advantageous embodiment, the bead structure of the respective stator groove can comprise at least one bead or bead which runs continuously along the groove edge, in particular in a U-shape or ring-shaped manner. Alternatively, the bead structure may also comprise a plurality of individual beads or caterpillars which are arranged along the groove edge at a distance from one another.It is furthermore advantageous if the respective bead structure is formed from a plastic, in particular a thermoplastic, silicone or elastomer. In this way, the bead structure can provide the required elastic deformation.It is furthermore advantageous that the clamping disks each have a disk body, in particular made of metal or plastic, on which teeth and grooves formed between the teeth are provided, wherein the respective bead structure is formed, molded or injection-molded on the disk body, applied to the disk body or placed as a separate part on the disk body. As a result, the clamping disk can be produced particularly easily and cost-effectively.According to an advantageous embodiment, it can be provided that the pane body has a carrier body, in particular made of metal, on which plastic is molded, injection-molded or applied, wherein the at least one bead structure, in particular the plurality of individual bead structures, is or are formed on the plastic. As a result, the clamping disk can be produced particularly easily and cost-effectively.It is also advantageous if the clamping disk is an end disk which is arranged on an end face of the stator body, or if the clamping disk is an intermediate disk which is arranged between two partial bodies of the stator body. In this way, the support points can be formed at the ends of the stator body and / or in an intermediate region, in particular in a center, of the stator body.It is further advantageous if the stator body has through-holes for the passage of fastening screws and for the fastening of the stator to a housing, wherein the stator body can be braced against the housing by means of the fastening screws with axial bracing of the bead structures of the clamping disks. In this way, with the attachment of the stator, a formation of the supporting points or a clamping of the conductors or conductor bundles can be achieved simultaneously.Advantageously, the stator slots have slot slots which are closed by at least one slot closure. In this way, the slot channels are sealed in a sealing or quasi-sealing manner in the radial direction toward an air gap of the electric machine.The invention further relates to an electric machine having a stator according to the invention.DRAWINGAn exemplary embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.The following are shown: FIG. 1 shows a stator of an electric machine having three clamping disks according to the invention, FIG. 2 is a sectional view of the stator for a section running through a stator groove along the line II-II in FIG. 1 , FIG. 3 is a partial view of one of the clamping disks according to the invention, and FIG. 4 is a sectional view of the clamping disk according to FIG. 3 for a section along the line IV--IV in FIG. 3.DESCRIPTION OF THE EMBODIMENTFIG. 1 shows a stator of an electric machine with three clamping disks according to the invention.The stator 1 of an electric machine 2 has a stator body 3 and a stator winding 4, which runs through stator slots 5 of the stator body 3. The stator body 3 can comprise a stator laminated core.FIG. 2 shows a sectional view of the stator for a section running through a stator groove along the line II-II in FIG. 1.In each of the stator slots 5, a plurality of support points 7 are formed which are spaced apart from one another in the axial direction with respect to a stator axis 6 for clamping the conductor 8 or conductor bundle 9 of the stator winding 4 lying in the respective stator slot 5. Between the support points 7, the conductor 8 or the conductor bundle 9 of the respective stator slot 5 are supported in a freely floating manner, i.e. without contact with the stator body 3.The conductor 8 or the conductor bundle 9 of the respective stator slot 5 is thus in contact with the stator body 3 only at the supporting points 7. Between the walls of the respective stator slot 5 and the conductor 8 or conductor bundle 9 arranged in the stator slot 5, at least one slot 10 is formed, which extends in the axial direction to form a slot channel and through which a cooling medium, in particular oil, can flow. The stator grooves 5 are closed in the region of groove slots 5 sby at least one groove closure 11, which can be, for example, a stator sealing sleeve or a split tube.The stator slots 5 are formed between slot flanks 5 fof stator teeth 15.The stator body 3 has at least two clamping disks 12, on which clamping structures 13 are formed to form the support points 7.The respective clamping disk 12 can be an end disk 12 earranged on an end face of the stator body 3, or an intermediate disk 12 marranged in particular centrally between two partial bodies of the stator body 3.According to the invention, it is provided that the clamping structures 13 of the clamping disks 12 are formed by elastically deformable bead structures which are axially braced to form the supporting points 7 and, as a result of the bracing, are elastically pushed or deformed into the respective stator groove 5.The respective bead structure 13 of the respective clamping disk 12 projects in the non-tensioned state in the axial direction with respect to the stator axis 6 relative to the remaining part of the clamping disk 12. In addition, the respective bead structure 13 or a part of the bead structure 13 in the non-tensioned state can additionally protrude into the respective stator groove 5.The axial bracing of the bead structures 13 can be effected by exerting pressure forces acting in the axial direction on the clamping disks 12, for example by means of screws or tie rods.According to the exemplary embodiment, the stator body 3 according to FIG. 1 has through-holes 18 for the passage of fastening screws 19 and for the fastening of the stator 1 to a housing 20. The stator body 3 can be braced against the housing 20 by means of the fastening screws 19 with axial bracing of the bead structures 13 of the clamping disks 12.FIG. 3 shows a partial view of one of the clamping disks according to the invention.The respective clamping disk 12 has a bead structure 13 per stator groove 5.The respective bead structure 13 is formed per stator slot 5 at least on two opposite slot flanks 5 fof the stator slot 5, in particular additionally on a slot base 5 gand / or on a slot slot 5 s.The respective bead structure 13 is arranged on or along a groove edge 5 rof the respective stator groove 5.The bead structure 13 of the respective stator groove 5 comprises at least one bead 14 or bead 14 which runs continuously along the groove edge 5 r, in particular in a U-shaped or annular manner. The bead structure 13 of the respective stator groove 5 can also comprise a plurality of individual beads 14 or caterpillars 14 which are arranged along the groove edge 5 rwith a distance from one another.The respective bead structure 13 is formed from a plastic, in particular a thermoplastic, silicone or elastomer.FIG. 4 shows a sectional view of the clamping disk according to FIG. 3 for a section along the line IV-IV in FIG. 3.The clamping disks 12 each have a disk body, in particular made of metal or plastic, on which teeth 15 aand grooves 5 aformed between the teeth 15 aare provided. The respective bead structure 13 is formed on the pane body 12, molded or injection molded, applied to the pane body 12 or placed as a separate part on the pane body 12.The pane body 12 can comprise a carrier body 12 t, in particular made of metal, on which plastic 12 kis molded, injection molded or applied. The at least one bead structure 13, in particular the plurality of individual bead structures 13, can be formed, for example, on the plastic 12 k.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 102019113785 A1

[0002]

Claims

Stator of an electric machine (2) having a stator body (3) which comprises in particular a stator laminated core, and having a stator winding (4) which runs through stator slots (5) of the stator body (3), wherein in each of the stator slots (5) a plurality of supporting points (7) which are spaced apart from one another in the axial direction with respect to a stator axis (6) are formed for clamping the conductor (8) or conductor bundle (9) of the stator winding (4) lying in the respective stator slot (5), wherein between the walls of the respective stator slot (5) and the conductor (8) or conductor bundle (9) arranged in the stator slot at least one slot (10) is formed, which slot extends in the axial direction forming a slot channel and through which a cooling medium, in particular oil, can flow, wherein the stator body (3) comprises at least two clamping disks (12), Clamping structures (13) on which the supporting points (7) are formed, characterized in that the clamping structures (13) are formed by elastically deformable bead structures (13) which are axially braced to form the supporting points (7) and, as a result of the bracing, are elastically pushed or deformed into the respective stator groove (5).Stator according to Claim 1, characterized in that the respective bead structure (13) of the respective clamping disc (12), in the non-tensioned state, protrudes in the axial direction with respect to the stator axis (6) with respect to the remaining part of the clamping disc (12), in particular, in the non-tensioned state, additionally protrudes into the respective stator groove (5).Stator according to one of the preceding claims, characterized in that the respective clamping disc (12) has a bead structure (13) per stator groove (5).Stator according to Claim 3, characterized in that the respective bead structure (13) per stator slot (5) is formed at least on two opposite slot flanks (5f) of the stator slot (5), in particular additionally on a slot base (5g) and / or on a slot slot (5s).Stator according to one of the preceding claims, characterized in that the respective bead structure (13) is arranged on or along a groove edge (5r) of the respective stator groove (5).Stator according to Claim 5, characterized in that the bead structure (13) of the respective stator groove (5) - comprises at least one bead (14) or bead (14) which runs continuously along the groove edge (5r), in particular in a U-shaped or annular manner, or - comprises a plurality of individual beads (14) or beads (14) which are arranged at a distance from one another along the groove edge (5r).Stator according to one of the preceding claims, characterized in that the respective bead structure (13) is formed from a plastic, in particular a thermoplastic, silicone or elastomer.Stator according to one of the preceding claims, characterized in that the clamping discs (12) each have a disc body (12), in particular made of metal or plastic, on which teeth (15a) and grooves (5a) formed between the teeth (15a) are provided, wherein the respective bead structure (13) is formed, formed or injection-molded on the disc body (12), applied to the disc body (12) or placed as a separate part on the disc body (12).Stator according to Claim 8, characterized in that the disc body (12) has a carrier body (12t), in particular made of metal, on which plastic is integrally formed, injection-moulded or applied, wherein the at least one bead structure (13), in particular the plurality of individual bead structures (13), is or are formed on the plastic.Stator according to one of the preceding claims, characterized in that the clamping disc (12) is an end disc (12e) which is arranged on an end face of the stator body (3), or in that the clamping disc (12) is an intermediate disc (12m) which is arranged between two part bodies of the stator body (3).Stator according to one of the preceding claims, characterized in that the stator body (3) has through-holes (18) for the passage of fastening screws (19) and for the fastening of the stator (1) to a housing (20), wherein the stator body (3) can be braced against the housing (20) by means of the fastening screws (19) with axial bracing of the bead structures (13) of the clamping disks (12).Stator according to one of the preceding claims, characterized in that the stator slots (5) have slot slots (5s) which are closed by at least one slot closure (11).Electric machine (2) having a stator (1) according to one of the preceding claims.

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