Stator of an electric machine

Abstract

The invention relates to a stator of an electric machine (2) comprising a stator body (3), in particular a stator body which comprises a stator laminated core, and a stator winding (4) which runs through stator slots (5) of the stator body (3). Each stator slot (5) is equipped with a respective plurality of support points (7), which are mutually spaced in the axial direction with respect to the stator axis (6), for clamping the stator winding (4) conductor (8) or conductor bundle (9) lying in the respective stator slot (5). Between the walls of each stator slot (5) and the conductor (8) or conductor bundle (9) provided in the stator slot is at least one slot gap (10) which extends in the axial direction, thereby forming a slot gap channel, and through which a cooling medium, in particular oil, can flow. The stator body (3) comprises at least two clamping discs (12), which are equipped with clamping structures (13) in order to form the support points (7). The invention is characterized in that the clamping structures (13) are made of elastically deformable bead structures (13), which are axially clamped and are elastically displaced or deformed into the respective stator slot (5) as a result of the clamping process in order to form the support points (7).

Description

[0001] Description

[0002] title

[0003] Stator of an electrical machine

[0004] State of the art

[0005] The invention is based on a stator of an electrical machine according to the preamble of the main claim.

[0006] A stator of an electrical machine is already known from DE102019113785 A1, comprising a stator body comprising a stator laminated core, and having a stator winding extending through stator slots of the stator body, wherein a plurality of support points, spaced apart from one another in the axial direction with respect to a stator axis, are formed in the stator slots for clamping the conductor or conductor bundle of the stator winding located 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 extends in the axial direction to form a slot gap 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 to form the support points.

[0007] Advantages of the invention

[0008] The stator of an electrical machine according to the invention with the characterizing features of the main claim has the advantage that the conductor bundles can be inserted into the stator slots during assembly without clamping forces. In this way, the manufacturing costs of the stator are reduced. Furthermore, damage to the conductor bundles when inserting 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 that are axially clamped to form the support points and, as a result of the clamping, are elastically displaced or deformed into the respective stator slot. The measures listed in the subclaims enable advantageous further developments and improvements of the stator of an electrical machine specified in the main claim.

[0009] According to an advantageous embodiment, the respective bead structure of the respective clamping disc, in the unstressed state, protrudes in the axial direction relative to a stator axis relative to the remaining part of the clamping disc. In this way, the bead structures can be partially displaced into the stator slots when axially preloaded.

[0010] In particular, the respective bead structure can also protrude into the respective stator slot in the unstressed state. This defines a preferred direction for the displacement or deformation of the bead structure, allowing the support points to be manufactured reliably and reproducibly.

[0011] It is particularly advantageous if the respective clamping disc has a bead structure for each stator slot. This creates a support point for each clamping disc and each stator slot.

[0012] It is very advantageous if the respective bead structure is formed on at least two opposite flanks of the stator slot per stator slot, in particular additionally on a slot base and / or on a slot slot. In this way, the respective support point can be manufactured reliably and reproducibly.

[0013] It is also advantageous if the respective bead structure is arranged on or along a slot edge of the respective stator slot. In this way, the bead structure is formed very close to the respective stator slot, so that the deformation path by which the bead structure must be displaced to form the support point can be kept to a minimum.

[0014] According to an advantageous embodiment, the bead structure of the respective stator slot can comprise at least one bead or bead that runs continuously along the slot edge, in particular in a U-shape or ring-shaped manner. Alternatively, the bead structure can also comprise several individual beads or bead structures that are arranged at a distance from one another along the slot edge. Furthermore, it is 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.

[0015] It is also advantageous that the clamping discs each have a disc body, particularly made of metal or plastic, on which teeth and grooves formed between the teeth are provided. The respective bead structure is formed on the disc body, molded or injection-molded onto it, applied to the disc body, or placed on the disc body as a separate part. This allows the clamping disc to be manufactured particularly easily and cost-effectively.

[0016] According to an advantageous embodiment, it can be provided that the disc body has a carrier body, in particular made of metal, onto 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.

[0017] This makes it particularly easy and cost-effective to produce the clamping disc.

[0018] It is also advantageous if the clamping disc is an end disc arranged on an end face of the stator body, or if the clamping disc is an intermediate disc 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.

[0019] It is further advantageous if the stator body has through holes for the passage of fastening screws and for fastening the stator to a housing. The stator body can be clamped against the housing by means of the fastening screws, axially clamping the bead structures of the clamping discs. In this way, the support points can be formed or the conductors or conductor bundles can be clamped in place simultaneously with the fastening of the stator.

[0020] Advantageously, the stator slots have slot slots that are closed by at least one slot closure. In this way, the slot gap channels are sealed tightly or quasi-tightly in the radial direction toward an air gap of the electric machine. The invention further relates to an electric machine with a stator according to the invention.

[0021] drawing

[0022] An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.

[0023] They show:

[0024] Fig.1 a stator of an electrical machine with three clamping discs according to the invention,

[0025] Fig.2 a sectional view of the stator for a through a stator slot running

[0026] Section along the line ll-ll in Fig.1 ,

[0027] Fig.3 is a partial view of one of the clamping discs according to the invention and

[0028] Fig.4 a sectional view of the clamping disc according to Fig.3 for a section along the

[0029] Line IV-IV in Fig.3.

[0030] Description of the embodiment

[0031] Fig.1 shows a stator of an electrical machine with three clamping discs according to the invention.

[0032] The stator 1 of an electrical machine 2 has a stator body 3 and a stator winding 4 that runs through stator slots 5 of the stator body 3. The stator body 3 can comprise a stator laminated core.

[0033] Fig.2 shows a sectional view of the stator for a section through a stator slot along the line ll-ll in Fig.1.

[0034] In each of the stator slots 5, a plurality of support points 7 are formed, 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. Between the support points 7, the conductor 8 or the conductor bundle 9 of the respective stator slot 5 is freely suspended, i.e., without contact with the stator body 3. The conductor 8 or the conductor bundle 9 of the respective stator slot 5 is therefore only in contact with the stator body 3 at the support 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 gap 10 is formed, which extends in the axial direction to form a slot gap channel and through which a cooling medium, in particular oil, can flow. The stator slots 5 are closed in the region of slot slots 5s by at least one slot closure 11, which for example is a stator sealing sleeve ora split tube can be, closed.

[0035] The stator slots 5 are formed between slot flanks 5f of stator teeth 15.

[0036] The stator body 3 has at least two clamping discs 12 on which clamping structures 13 are formed to form the support points 7.

[0037] The respective clamping disc 12 can be an end disc 12e, which is arranged on an end face of the stator body 3, or an intermediate disc 12m, which is arranged in particular centrally between two partial bodies of the stator body 3.

[0038] According to the invention, the clamping structures 13 of the clamping discs 12 are formed by elastically deformable bead structures 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.

[0039] In the unclamped state, the respective bead structure 13 of the respective clamping disc 12 protrudes in the axial direction relative to the stator axis 6 relative to the remaining part of the clamping disc 12. Furthermore, the respective bead structure 13 or a part of the bead structure 13 can also protrude into the respective stator slot 5 in the unclamped state.

[0040] The axial tensioning of the bead structures 13 can be achieved by exerting compressive forces acting in the axial direction on the clamping discs 12, for example by means of screws or tie rods.

[0041] According to the exemplary embodiment, the stator body 3 shown in Fig. 1 has through holes 18 for the passage of fastening screws 19 and for fastening the stator 1 to a housing 20. The stator body 3 can be clamped against the housing 20 by means of the fastening screws 19, axially clamping the bead structures 13 of the clamping discs 12.

[0042] Fig.3 shows a partial view of one of the clamping discs according to the invention.

[0043] The respective clamping disc 12 has a bead structure 13 for each stator slot 5.

[0044] The respective bead structure 13 is formed per stator slot 5 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.

[0045] The respective bead structure 13 is arranged on or along a groove edge 5r of the respective stator groove 5.

[0046] The bead structure 13 of the respective stator slot 5 comprises at least one bead 14 or bead 14 that runs continuously along the slot edge 5r, in particular in a U-shape or ring shape. The bead structure 13 of the respective stator slot 5 can also comprise a plurality of individual beads 14 or beads 14 that are arranged at a distance from one another along the slot edge 5r.

[0047] The respective bead structure 13 is formed from a plastic, in particular a thermoplastic, silicone or elastomer.

[0048] Fig.4 shows a sectional view of the clamping disc according to Fig.3 for a section along the line IV-IV in Fig.3.

[0049] The clamping discs 12 each have a disc body, in particular made of metal or plastic, on which teeth 15a and grooves 5a formed between the teeth 15a are provided. The respective bead structure 13 is formed on the disc body 12, molded or injection-molded, applied to the disc body 12, or placed on the disc body 12 as a separate part.

[0050] The disc body 12 can comprise a carrier body 12t, in particular made of metal, onto which plastic 12k is 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 12k.

Claims

Claims 1. 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 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), wherein between the walls of the respective stator slot (5) and the conductor (8) or conductor bundle (9) arranged in the stator slotConductor bundle (9) at least one slot gap (10) is formed, 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).

2. Stator according to claim 1, characterized in that the respective bead structure (13) of the respective clamping disc (12) in the unstressed state protrudes in the axial direction with respect to the stator axis (6) relative to the remaining part of the clamping disc (12), in particular in the unstressed state additionally protrudes into the respective stator groove (5).

3. Stator according to one of the preceding claims, characterized in that the respective clamping disc (12) has a bead structure (13) for each stator slot (5).

4. 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).

5. 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).

6. 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 U-shaped or annular, or - comprises a plurality of individual beads (14) or beads (14) arranged at a distance from one another along the groove edge (5r).

7. 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.

8. 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 on the disc body (12), molded or injection-molded, applied to the disc body (12) or placed as a separate part on the disc body (12).

9. Stator according to claim 8, characterized in that the disc body (12) has a carrier body (12t), in particular made of metal, to which plastic is molded, injection-molded 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.

10. 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 that the clamping disc (12) is an intermediate disc (12m) which is arranged between two partial bodies of the stator body (3). 11 . 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 fastening the stator (1) to a Housing (20), wherein the stator body (3) can be clamped against the housing (20) by means of the fastening screws (19) with axial clamping of the bead structures (13) of the clamping discs (12).

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).

13. Electrical machine (2) with a stator (1) according to one of the preceding claims.

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