Stator of an electric machine

Abstract

Stator (1) of an electric machine, comprising an annular stator body (10) in which a plurality of winding slots (11) are provided, wherein the winding slots (11) project into the stator body (10) from an inner surface (12) of the annulus in a pocket-like manner, and wherein respective windings (13) are provided in the winding slots (11), each of which is closed towards the inner surface (12) of the annulus by a cover slide element (14), and wherein the cover slide elements (14) of all winding slots (11) are joined together to form a cover slide cage (15), wherein the cover slide cage (15) has circumferential cage rings (16) at the ends of the cover slide elements (14), wherein the cage rings (16) are interrupted at a circumferential point (X), wherein the circumferential point (X) has a self-locking locking geometry (17) which prevents the automatic opening of two interlocking gripping ring ends (18, 19) of the cage rings (16) prevented.

Description

[0001] The present invention relates to a stator of an electric machine, with an annular stator body in which a plurality of winding slots are provided, wherein the winding slots project into the stator body from an inner side of the ring in a pocket-like manner, and wherein respective windings are provided in the winding slots, each of which is closed towards the inner side of the ring with a cover slide element, and wherein the cover slide elements of all winding slots are joined together to form a cover slide cage, wherein the cover slide cage has circumferential cage rings at the ends of the cover slide elements. STATE OF THE ART

[0002] DE 10 2004 015 243 B4 discloses a stator of an electric machine with an annular stator body in which a plurality of winding slots are provided. Windings are inserted into these slots from the inside of the ring into the pocket-like winding slots. The inside of the ring has the shape of a hollow cylinder in which a rotor is inserted to form the electric machine and is rotatably mounted via bearing devices connected to the stator. To close the winding slots inwards towards the inside of the ring, so-called cover slide elements are used. In the prior art, these elements are formed from individual slide elements that are inserted into the opening area of ​​the pocket-like winding slots towards the inside of the ring.Unfortunately, the assembly of the cover slide elements is complex, and due to spatial conditions, especially with regard to the winding extending axially beyond the stator, the opening areas of the pocket-like winding grooves into the inside of the ring are difficult to access.

[0003] Cover slide cages are known from US 2004 / 0145267 A1 and GB 2 509 738 A. These cages consist of a multitude of individual cover slide elements connected by one or two cage rings and pre-positioned in their arrangement, so that the cover slide cage only needs to be inserted into the stator body from the inside of the ring. The individual cover slide elements then enter the opening areas of the pocket-like winding slots to close the windings. However, inserting the cover slide cage is difficult due to the accessibility of the winding slot openings to the inside of the ring, especially if the cover slide cage is dimensionally stable and the windings protrude laterally beyond the stator body.

[0004] US patent 2009 / 0 079 292 A1 discloses an insulation between the individual phases of the winding in the slots of a stator, which is joined together in a ring shape and whose free ends are abutted and welded at a circumferential point.

[0005] From JP 2000 - 134 846 A, a circumferential damping ring is known at the open ends of slots of a rotor, which also projects into the slots and is composed of two halves.

[0006] From CN 205 017 137 U, a cover for a partial circumference of a stator is known, consisting of two parts connected by a flexible band. REVELATION OF THE INVENTION

[0007] The object of the invention is the further development of a stator with an improved arrangement of cover valve elements. In particular, a cover valve cage is to be improved which is easier to attach to the stator body.

[0008] This problem is solved starting from a stator according to claim 1 and starting from a cover valve cage according to the preamble of claim 9 with the characterizing features. Advantageous embodiments of the invention are specified in the dependent claims.

[0009] The invention includes the technical teaching that the cage rings are interrupted at a circumferential point, wherein the circumferential point has a self-locking locking geometry that prevents the independent opening of two interlocking ring ends of the cage rings.

[0010] The core concept of the invention is the possibility of interrupting the ring-shaped cover valve cage for mounting on the stator body. When unwound or unfolded, the cover valve cage forms a rectangular strip with parallel cover valve elements and unwound cage rings at the edges. By means of a particularly flexible design of the cover valve cage, the diameter for insertion into the inner surface of the stator body can be reduced by opening the cage rings. The cover valve elements can then be pre-positioned and pressed into the individual winding slots from the inner surface of the ring through the cage rings. Finally, the openings at the circumference of the cage rings are closed, allowing the cover valve cage to be easily mounted and remain in the assembled configuration.Due to the lock geometry, the circumferential area cannot open spontaneously, preventing the ring ends from separating on their own. The function of the cover slide cage is thus fully fulfilled, and subsequent impregnation further prevents the lock geometry from opening, as it causes the ring ends to adhere to one another.

[0011] A particular advantage is achieved with the lock geometry when it is designed with a positive locking mechanism in the radial direction of the cover gate cage. The radial direction refers to the annular stator body, so that the positive locking mechanism prevents at least one end of the ring from migrating spontaneously inwards or outwards in the radial direction, or in the tangential direction.

[0012] An advantageous embodiment of the invention provides that the locking geometry has a notch at a first ring end and a bulge at a second ring end, with the bulge fitting into the notch to form the positive locking mechanism. The interaction between the notch and the bulge creates a tongue-and-groove connection, forming a positive locking mechanism laterally transverse to the circumferential direction of the cage rings. The bulge and the notch are designed such that they can snap into each other upon application of force, without requiring axial insertion of the bulge into the notch. Securing the bulge within the notch is further enhanced by the fact that the cover valve cage is seated in the stator body under tangential preload from the inside of the ring, thus pressing the bulge into the notch.

[0013] By using several notches and bulges across the width of the cage ring, a lock geometry with an S-shaped dividing line between the two ring ends can be created, which prevents the cover slide ring from snapping open in any direction, i.e. radially inwards, radially outwards or in a tangential direction.

[0014] According to a further variant, it is also conceivable that several lock geometries are incorporated into the cage rings distributed around the circumference, so that the cover slide cage can be assembled from several segments, which may result in easier assembly.

[0015] A further improvement of the cover valve cage is achieved by forming projections between the cover valve elements on the cage rings. These projections can rest on a side face of the stator body when the cover valve cage is mounted on the stator body. The projections extend alternately from the cage rings towards the opposite cage ring, alternating with the cover valve elements. The projections are designed to be short enough that the head of the projections on the first cage ring and the head of the projections on the second cage ring together form the clear, unobstructed dimension that corresponds to the axial length of the stator body from side face to side face.

[0016] This further improves the holding arrangement of the cover valve cage on the stator body.

[0017] To further simplify the assembly of the deck slide cage, the projections can also have insertion ramps so that the projections can be pushed more easily onto the side surface of the stator body.

[0018] A further improvement to the stator involves the cover slide elements being tapered and / or wedge-shaped in the radially outward direction, so that the tapering or wedge shape projects into the winding slot towards the winding. This facilitates pressing the cover slide elements into the opening area of ​​the winding slots from the inner ring of the stator body. Manufacturing the cover slide cage is significantly simplified if it is formed from a single injection-molded component.

[0019] The invention further relates to a cover slide cage for arrangement on a stator, comprising a plurality of cover slide elements extending parallel to one another between two cage rings. According to the invention, the cage rings are interrupted at a circumferential point, the circumferential point having a self-locking locking geometry that prevents the independent opening of two interlocking ring ends of the cage rings. In particular, the locking geometry has a notch at a first ring end and a bulge at a second ring end, the bulge engaging in the notch to form a positive locking connection. The further features and associated advantages described in connection with the stator are also taken into account for the cover slide cage. PREFERRED EXAMPLE OF THE INVENTION

[0020] Further measures improving the invention are described in more detail below, together with a description of a preferred embodiment of the invention, with reference to the figures. The figures show: Fig. 1 a perspective view of a stator with a stator body and a cover valve cage inserted from the inner ring side of the stator body; Fig. 2 a perspective view of a deck slide cage with a circumferential point X, Fig. 3 a detailed view of the arrangement of the deck valve cage on the stator body, Fig. 4 a detailed view of the circumferential point X of the deck sliding cage, Fig. 5 a detailed view of the cage ring in the area of ​​a circumferential point with two ring ends, Fig. 6 a cross-sectional view of a cover slide element that sits in a winding groove and Fig. 7 a detailed view of the deck slide cage in the area of ​​a cage ring.

[0021] Fig. Figure 1 shows a perspective view of a stator 1 for an electric machine. The stator 1 has as its essential component an annular stator body 10, the annular shape describing the basic structure of the stator body 10. An inner ring 12 is formed within the annular stator body 10, and winding slots 11 extend radially outwards from the inner ring 12 into the stator body 10. Windings 13 are inserted into the winding slots 11. A rotor can be arranged within the inner ring 12 to form the electric machine, and when the windings 13 are appropriately energized, the rotor can perform a rotational movement within the inner ring 12.The inner surface of the ring 12 essentially forms the envelope shape of a cylinder and has an axial direction that reflects the width direction of the stator body 10, and the winding slots 11 project radially from the inside out into the stator body 10.

[0022] A cover slide cage 15 is shown inserted into the stator body 10 from the inner side 12 of the ring, and the cover slide cage 15 has a plurality of cover slide elements 14 that are seated in the opening regions of the winding slots 11. The cover slide elements 14 essentially close off the winding slots 11 towards the inner side 12 of the ring, so that the windings 13 are encapsulated in the winding slots 11.

[0023] Fig. Figure 2 shows a perspective view of a deck slide cage 15 with a plurality of deck slide elements 14 extending axially and arranged parallel to each other, which are received between two circumferential cage rings 16. The cage rings 16 have a circumferential point X at which the cage rings 16 have a break according to the present invention.

[0024] Fig. Figure 3 shows a detailed view of the cover slide cage 15 with the interruption X, and the cover slide cage 15 with the cover slide elements 14 is shown inserted in the stator body 10. The windings 13 are also shown section by section, and the winding slots 11 essentially accommodate the cover slide elements 14, such that the cover slide elements 14 are seated in the front regions of the winding slots 11. The cover slide cage 15 also has projections 22 that rest on a side surface of the stator body 10, as described in connection with Fig. 7 described in more detail.

[0025] Fig. Figure 4 shows a partial view of the cover slide cage 15 with the cover slide elements 14 and one of two cage rings 16, with the cage ring 16 shown in the region of the circumferential point X. The break at the circumferential point X forms a first ring end 18 and an opposing second ring end 19 in the cage ring 16, and the ring ends 18 and 19 interlock in such a way that a self-locking lock geometry 17 is formed, as in connection with the following Fig. 5 described in more detail.

[0026] Fig. Figure 5 shows a detailed view of the lock geometry 17 between the two interlocking ring ends 18 and 19. The lock geometry 17 has a notch 20 at the first ring end 18 and a protrusion 21 at the second ring end 19. The protrusion 21 fits into the notch 20 to form a positive locking mechanism. The cover slide elements 14 extend from the underside of the ring ends 18 and 19, and the lock geometry 17 is positioned between two cover slide elements 14.

[0027] Fig. Figure 6 shows a cross-sectional view through the stator body 10 in the area of ​​a winding slot 11, in which a winding 13 is inserted. Towards the inner side 12 of the ring, the winding slot 11 is closed by a cover slide element 14, which has an approximately wedge-shaped form that tapers into the winding slot 11. The winding slot 11 is lined laterally with an insulating element 25, for example, an electrically non-conductive film or electrically non-conductive insulating paper.

[0028] Finally, it shows Fig. Figure 7 shows a perspective view of a section of the cover valve cage 15 in the area of ​​a radially circumferential cage ring 16, from which several cover valve elements 14 extend in the axial direction. Projections 22 are formed between the cover valve elements 14 and are arranged on the inside of the cage ring 16, which can rest on a side surface 23 of the stator body 10, as with the projections 22 of the cover valve cage 15 in Fig. Figure 3 shows that the projections 22 have lead-in chamfers 24 for easy mounting of the cover valve cage 15 in the inner surface 12 of the ring. The cover valve cage 15 has, for example, a diameter of 200 mm to 220 mm, and the axial height of the cage rings 16 is, for example, 2.5 mm to 3.5 mm, and preferably 2.8 mm. The height of the cage ring 16, including the projections 22, is, for example, 6 mm. The cover valve elements 14 have, for example, a width of 1.6 mm, the width being measured at the base width over which the taper or wedge shape extends.

[0029] The inventive further development of the cover gate cage 15 and the interruption at the two cage rings 16 enables simple assembly of the cover gate cage 15. First, the cover gate cage 15 is provided with interrupted ring ends 18, 19, so that the cover gate cage 15 can be inserted, for example, in an unwound form, into the inner ring 12 of the stator body 10. Subsequently, the individual cover gate elements 14 are inserted into the opening areas of the winding slots 11, and the projections 22 on the cage rings 16 between the cover gate elements 14 position the cover gate cage 15 in the axial direction. Once all cover gate elements 14 have been inserted into the winding slots 11, the locking geometry 17 can be closed by pressing the protrusion 21 into the notch 20 from a radial direction.By simply snapping the protrusion 21 into the notch 20, the positive locking in the radial direction is achieved, so that an automatic opening of the ring ends 18, 19 of the cage rings 16 is prevented.

[0030] The invention is not limited in its implementation to the preferred embodiment described above. Rather, a number of variants are conceivable, which utilize the solution presented even in fundamentally different designs. All features and / or advantages arising from the claims, the description, or the drawings, including design details, spatial arrangements, and process steps, can be essential to the invention, both individually and in various combinations. Reference symbol list 1 Stator 10 Stator bodies 11 Winding slot 12 Ring inside 13 windings 14 Cover sliding element 15 deck sliding cages 16 cage ring 17 Lock geometry 18 wrestling matches 19 wrestlers 20 notches 21 Bulge 22 lead 23 side surface 24 Inset chamfer 25 insulating bodies X Scope point

Claims

[1] Stator (1) of an electric machine, comprising an annular stator body (10) in which a plurality of winding slots (11) are provided, wherein the winding slots (11) project into the stator body (10) from an inner surface (12) in a pocket-like manner, and wherein respective windings (13) are provided in the winding slots (11), each of which is closed towards the inner surface (12) by a cover slide element (14), and wherein the cover slide elements (14) of all winding slots (11) are joined together to form a cover slide cage (15), wherein the cover slide cage (15) has circumferential cage rings (16) at the ends of the cover slide elements (14), wherein the cage rings (16) are interrupted at a circumferential point (X), wherein the circumferential point (X) has a self-locking lock geometry (17) which prevents the automatic opening of two interlocking ring ends (18, 19) of the cage rings (16) prevented. [2] Stator (1) according to claim 1, characterized by, that the lock geometry (17) is designed with a positive locking in the radial direction of the cover slide cage (15). [3] Stator (1) according to claim 1 or 2, characterized by , that the lock geometry (17) has a notch (20) at a first ring end (18) and a bulge (21) at a second ring end (19), wherein the bulge (21) sits in the notch (20) to form the positive locking mechanism. [4] Stator (1) according to claim 3, characterized by , that the cover slide cage (15) is seated in the stator body (10) under tangential preload from the inner ring side (12), so that the bulge (21) is pressed into the notch (20). [5] Stator (1) according to any of the preceding claims, characterized by , that projections (22) are formed between the cover slide elements (14) on the cage rings (16), which sit on a side surface (23) of the stator body (10). [6] Stator (1) according to claim 5, characterized bythat the projections (22) have an insertion ramp (24). [7] Stator (1) according to any of the aforementioned claims characterized by , that the cover slide elements (14) are tapered and / or wedge-shaped in the radially outward direction, so that the tapering or wedge shape projects into the winding groove (11) in the direction of the winding (13). [8] Stator (1) according to any of the aforementioned claims, characterized by , that the deck slide cage (15) is formed from a one-piece injection-molded component. [9] Cover slide cage (15) for arrangement on a stator (1), comprising a plurality of cover slide elements (14) which extend parallel to each other between two cage rings (16), characterized by, that the cage rings (16) are interrupted at a circumferential point (X), wherein the circumferential point (X) has a self-locking lock geometry (17) that prevents the independent opening of two interlocking ring ends (18, 19) of the cage rings (16). [10] Cover slide cage (15) according to claim 9, characterized by , that the lock geometry (17) has a notch (20) at a first ring end (18) and a bulge (21) at a second ring end (19), wherein the bulge (21) sits in the notch (20) to form a positive locking mechanism.

Images