Lamella for introducing a slot-closure element into a slot in a stator of an electric machine, and apparatus and method for introducing slot-closure elements into a respectively associated stator slot

Abstract

The invention relates to a lamella (10) for introducing a slot-closing element (3) into a slot (7) in a stator (4) of an electric machine (5), wherein the lamella (10) is of elongate design and - as seen in the main direction of extent (H) - has a connecting end (10.1) and an insertion end (10.2), wherein on a first side, which faces the connecting end (10.1), the lamella (10) has a receiving portion (A) for receiving the slot-closing element (3) and on a second side, which faces the insertion end (10.2), it has a guide portion (F), wherein the guide portion (F) has a protrusion (12) which extends perpendicularly in relation to the main direction of extent (H), is formed along a first transverse direction (Q1) and is intended for guiding the lamella (10) when the slot-closing element (3) is being introduced into an associated stator slot (7).

Description

[0001] Lamella for introducing a slot closure element into a stator slot of a stator of an electrical machine, device and method for introducing slot closure elements into an assigned stator slot

[0002] The invention relates to a lamination for inserting a slot closure element into a stator slot of a stator of an electrical machine. Furthermore, the invention relates to a device and a method for inserting slot closure elements into a respective assigned stator slot of a stator of an electrical machine.

[0003] In the prior art, the insertion of slot closure elements – commonly referred to as cover slides or slot closure wedges – into a stator of an electrical machine, particularly one designed as an internal rotor, is usually carried out automatically using a device having laminations, each of which encloses a slot closure element. Inserted laminations are moved parallel to a longitudinal direction of the stator or parallel to a rotational axis of the electrical machine such that the slot closure elements are each inserted axially into a stator slot of the stator. The insertion of the slot closure elements into the stator slots, as known in the prior art, has the disadvantage that the laminations can be pressed radially in the direction of the slot opening by winding wires arranged in the stator slots. This can, on the one hand, lead to incorrect positioning of the slot closure element.However, it is also possible that the lamination is damaged by the forces acting in the radial direction, for example because it becomes jammed in the stator slot.

[0004] Against this background, the task arises to provide a solution that reduces the risk of incorrect positioning of the slot locking elements and damage to the slats.

[0005] The object is achieved by a lamination for introducing a slot closure element into a stator slot of a stator of an electrical machine, wherein the lamination is elongated and has a connecting end and an insertion end with respect to a main extension direction, wherein the lamination has a receiving section for receiving the slot closure element on a first side facing the connecting end and a guide section on a second side facing the insertion end, wherein the guide section has a projection extending perpendicular to the main extension direction and formed along a first transverse direction for guiding the lamination when introducing the slot closure element into an assigned stator slot.

[0006] According to the invention, the lamination has a receiving section in which a slot closure element can be received when the laminations are inserted into the stator. Furthermore, the lamination has guide sections which guide the lamination when it is inserted into a stator slot of the stator. For guidance, a projection extending in the first transverse direction is provided in the guide section. This projection can be guided in the stator slot such that it is arranged radially inward relative to a slot opening, in particular to a narrowing of the stator slot in the region of the slot opening. An undesired escape of the slot closure element through the slot opening can thus be prevented. The risk of an undesired escape of the slot closure element from the slot opening and / or canting within the stator slot and / or buckling of the lamination and the associated damage can be reduced.

[0007] According to a preferred embodiment of the invention, the slat has two projections, wherein the projections are preferably formed symmetrically with respect to a plane of symmetry of the slat formed parallel to the main direction of extension. The - in particular symmetrical - formation of two projections on a slat can increase guiding precision during the axial insertion of the slats. A projection can have a contour with straight, angular, rounded and / or curved sections. Furthermore, a projection can taper to a point in the first transverse direction. A projection can extend over an entire length of a guide section, in particular parallel to the main direction of extension. Alternatively, a projection can have a plurality of elongated individual sections, wherein the individual sections extend along a straight line, in particular parallel to the main direction of extension.To simplify the insertion of the laminations into the stator slots of the stator, the projections in an initial area of ​​the laminations can each have a rounding and / or chamfering and / or beveling.

[0008] The lamination according to the invention is particularly suitable for introducing slot closure elements into a respective stator slot of a stator of an electrical machine, wherein the stator slot has a constriction in the region of the slot opening. The projection(s) of the lamination can engage behind the constriction of the stator slot and thus prevent the slot closure element from emerging radially through the slot opening. According to a preferred embodiment of the invention, a shoulder is formed between the receiving section and the associated guide section of the lamination, wherein the shoulder extends along a second transverse direction that is perpendicular to the main extension direction and to the first transverse direction. Due to the shoulder, a slot closure element that is arranged in the receiving section can be introduced into an assigned stator slot of the stator in a protected manner.Thus, the risk of damage to the slot closure element during a relative movement to the stator wire can be reduced.

[0009] A preferred embodiment of the invention provides a variable width of the slat along the main direction of extension, wherein the width extends parallel to the second transverse direction. By means of a variable width, the aforementioned step between the guide and receiving sections can be realized.

[0010] A preferred embodiment of the invention provides that the receiving section has a receiving length parallel to the main extension direction that is greater than or equal to the length of the slot closure element. A sufficiently long receiving length allows a slot closure element to be received in an associated receiving section, covering the entire slot length or the entire slot gap opening of the stator and thus enabling electrical insulation. Consequently, short circuits between the wire and the stator of the electrical machine can be avoided. The slot closure element can also be longer than the slot length of the stator slot.

[0011] According to an advantageous embodiment of the invention, the lamella is configured such that the guide section can be inserted into a stator slot assigned to the lamella before the receiving section. By first inserting the guide section of a lamella into an assigned stator slot, in particular, first inserting the insertion end of the lamella, the lamella can be guided throughout the entire insertion process.

[0012] A preferred embodiment of the invention provides a connecting section formed perpendicular to the main extension direction for holding and moving the lamella, wherein the connecting section is formed on the connecting end of the lamella. The connecting section can extend in particular along the second transverse direction. The connecting section can be positively and / or non-positively connected to one or more lamella holders, through which the lamella can be moved. An advantageous embodiment of the invention provides a groove at the insertion end for optimized positioning of the lamella. The groove can extend in a radial direction of the electrical machine, parallel to the second transverse direction and thus perpendicular to the projections. A protruding element that geometrically corresponds to the groove can mechanically interact with the groove and improve the positioning of the respective lamella.

[0013] A further subject of the invention is a device for introducing slot closure elements into a respective assigned stator slot of a stator of an electrical machine having a plurality of laminations movable along a longitudinal direction of the stator, wherein the laminations each have a receiving section for receiving a respective slot closure element and a guide section, wherein the guide sections each have a projection extending in a circumferential direction of the stator for guiding the laminations when introducing the slot closure elements into an assigned stator slot.

[0014] A further subject of the invention is a method for introducing slot closure elements into a respective assigned stator slot of a stator of an electrical machine having a rotational axis, wherein a plurality of laminations movable parallel to the rotational axis are provided, each lamination having a receiving section and a respective guide section, wherein the receiving sections each have a slot closure element and the guide sections each have a projection extending in a circumferential direction of the stator for guiding the laminations, wherein the slot closure elements are each introduced into an assigned stator slot.

[0015] The device and method for inserting slot closure elements can achieve the same technical effects and advantages as have already been described in connection with the lamella according to the invention.

[0016] An advantageous embodiment of the invention provides that stator teeth of the electrical machine have recesses along which the projections of the laminations are moved. Preferably, the stator teeth each have two recesses extending in the circumferential direction of the stator, wherein the recesses are preferably formed symmetrically with respect to a radial direction of the electrical machine. Alternatively, both the two projections of a lamination and the two recesses of a stator tooth can be asymmetrical with respect to the radial direction. For example, a first projection of a first lamination can be formed at a first radius and a second projection of the first lamination at a second radius. Analogously, a first recess of a first stator tooth can be formed at the first radius and a second recess of the first stator tooth at the second radius.

[0017] The preferred and advantageous embodiments and features explained in connection with the lamella according to the invention can also be used individually or in combination in the device according to the invention and the method according to the invention.

[0018] Further details and advantages of the invention will be explained below with reference to the exemplary embodiments illustrated in the drawings. Herein:

[0019] Fig. 1a schematically shows an embodiment of a slat according to the invention in a perspective view;

[0020] Fig. 1b shows schematically the lamella from Fig. 1a in a side view;

[0021] Fig. 2a schematically shows a plan view of the lamella from Fig. 1a according to a detailed view C - C;

[0022] Fig. 2b schematically shows a further plan view of the slat from Fig. 1a according to a detailed view D - D from Fig. 1b;

[0023] Fig. 3 shows schematically a detailed view of an electrical machine according to the invention; and

[0024] Fig. 4 schematically shows a device according to the invention for introducing slot closure elements into an assigned stator slot.

[0025] Fig. 1a schematically shows an embodiment of a lamination 10 according to the invention for introducing a slot closure element 3 into a stator slot 7 of a stator 4 of an electrical machine 5 in a perspective view. The lamination 10 is elongated and has a connecting end 10.1 and an insertion end (10.2) with respect to a main direction of extent H. The lamination 10 has, on a first side facing the connecting end 10.1, a receiving section A for receiving the slot closure element 3 and, on a second side facing the insertion end 10.2, a guide section F, wherein the guide section F has a projection 12 extending perpendicular to the main direction of extent H and formed along a first transverse direction Q1 for guiding the lamination 10 when introducing the slot closure element 3 into an assigned stator slot 7. The lamination shown in Fig.The embodiment shown in Fig. 1a also has two projections 12, wherein the projections 12 are symmetrical with respect to a plane of symmetry of the lamella 10, which is parallel to the main extension direction H and not shown in Fig. 1a. The projections 12 are also symmetrical with respect to a radial direction R of the electrical machine 5 (not shown).

[0026] Fig. 1b shows a schematic side view of the lamella from Fig. 1a. The lamella 10 has a variable width B along the main direction of extent H, wherein the width B runs parallel to a second transverse direction Q2 and the radial direction R of the electrical machine 5. Furthermore, the exemplary embodiment of the lamella 10 shown in Fig. 1a and Fig. 1b has a shoulder between the receiving section A and the guide section F, wherein the shoulder extends along the second transverse direction Q2, which is perpendicular to the main direction of extent H and to the first transverse direction Q1. The lamella 10 tapers from the connecting end 10.1 to the insertion end 10.2, at least on one side and at least partially to a point. In addition, the receiving section A has a receiving length parallel to the main direction of extent H, which is at least as long as a slot closure element length.

[0027] The slat 10 has a connecting section V formed perpendicular to the main extension direction H for holding and moving the slat 10, wherein the connecting section V is formed on the connecting end of the slat 10. Furthermore, the slat 10 has a groove (not visible in Fig. 1a and Fig. 1b) on an end face of the insertion end 10.2 for optimized positioning of the slat 10. The groove can interact mechanically with an element.

[0028] Fig. 2a schematically shows a top view of the slat 10 and a slot closure element 3 from Fig. 1a, received in the receiving area A of the slat 10, according to a detailed view C-C. The slat 10 has a quasi-T-shaped contour. Fig. 2b schematically shows another top view of the slat 10 from Fig. 1a according to a detailed view D-D from Fig. 1b, in which the projections 12 in the guide area F of the slat 10 are visible.

[0029] Fig. 3 schematically shows a detailed view of an electrical machine 5. The stator 4 of the electrical machine 5 has stator teeth 14 that extend in the radial direction R. The stator teeth 14 have recesses 16 that geometrically correspond to the projections 12, along which the projections 12 of the laminations 10 can be moved. By guiding the projections 12 along the recesses 16, movement of the laminations 10 in the radial direction can be prevented or at least reduced.

[0030] Fig. 4 schematically shows a device 1 for introducing slot closure elements 3 into a respective assigned stator slot 7 of a stator 4 of an electrical machine 5 having a plurality of laminations 10 movable along a longitudinal direction L of the stator 4. The slot closure elements 3 can be introduced simultaneously into the respective stator slot of the stator 4. The laminations 10 each have a receiving section A for receiving a respective slot closure element 3 and a guide section F. The guide sections F each have a projection 12 extending in a circumferential direction U of the stator 4 for guiding the laminations 10 when the slot closure elements 3 are introduced into an assigned stator slot 7.

[0031] List of reference symbols

[0032] 1 device

[0033] 2 stator winding / wire

[0034] 3 Slot locking element

[0035] 4 Stator

[0036] 5 Electric machine

[0037] 7 Stator slot

[0038] 10 slats

[0039] 10.1 End of connection

[0040] 10.2 End of introduction

[0041] 12 lead

[0042] 14 stator teeth

[0043] 16 Deepening

[0044] A recording section

[0045] B Width

[0046] F Guide section

[0047] H Main direction of extension

[0048] L longitudinal direction

[0049] R Radial direction

[0050] U circumferential direction

[0051] V connecting section

[0052] Q1 First transverse direction

[0053] Q2 Second transverse direction

Claims

Patent claims 1. A lamella (10) for inserting a slot closure element (3) into a stator slot (7) of a stator (4) of an electrical machine (5), wherein the lamella (10) is elongated and has a connecting end (10.1) and an insertion end (10.2) with respect to a main direction of extent (H), wherein the lamella (10) has a receiving section (A) for receiving the slot closure element (3) on a first side facing the connecting end (10.1) and a guide section (F) on a second side facing the insertion end (10.2), characterized in that the guide section (F) has a projection (12) extending perpendicular to the main direction of extent (H) and formed along a first transverse direction (Q1) for guiding the lamella (10) when inserting the slot closure element (3) into an assigned stator slot (7).

2. Slat (10) according to claim 1, characterized in that the slat (10) has two projections (12), wherein the projections (12) are preferably formed symmetrically with respect to a plane of symmetry of the slat (10) formed parallel to the main extension direction (H).

3. Slat (10) according to claim 1 or 2, characterized in that a shoulder is formed between the receiving section (A) and the associated guide section (F) of the slat (10), wherein the shoulder extends along a second transverse direction (Q2) which is perpendicular to the main extension direction (H) and to the first transverse direction (Q1).

4. Slat (10) according to claim 3, characterized by a variable width (B) of the slat (10) along the main extension direction (H), wherein the width (B) extends parallel to the second transverse direction (Q2).

5. Slat (10) according to one of the preceding claims, characterized in that the receiving section (A) has a receiving length parallel to the main extension direction (H) which is greater than or equal to a slot closure element length.

6. Slat (10) according to one of the preceding claims, characterized by a connecting section (V) formed perpendicular to the main extension direction (H) for holding and moving the slat (10), wherein the connecting section (V) is formed on the connecting end of the slat (10).

7. Slat (10) according to one of the preceding claims, characterized by a groove at the insertion end for optimized positioning of the slat (10).

8. Device (1) for introducing slot closure elements (3) into a respective assigned stator slot (7) of a stator (4) of an electrical machine (5) having a plurality of laminations (10) movable along a longitudinal direction (L) of the stator (4), characterized in that the laminations (10) each have a receiving section (A) for receiving a respective slot closure element (3) and a guide section (F), wherein the guide sections (F) each have a projection (12) extending in a circumferential direction (U) of the stator (4) for guiding the laminations (10) when introducing the slot closure elements (3) into an assigned stator slot (7).

9. Method for introducing slot closure elements (3) into a respective assigned stator slot (7) of a stator (4) of an electrical machine (5) having a rotational axis (D), wherein a plurality of laminations (10) which are movable parallel to the rotational axis (D) are provided, each lamination having a receiving section (A) and a respective guide section (F), wherein the receiving sections each have a slot closure element and the guide sections (F) each have a projection (12) extending in a circumferential direction (U) of the stator (4) for guiding the laminations (10), wherein the slot closure elements (3) are each introduced into a respective assigned stator slot (7).

10. Method according to claim 9, characterized in that stator teeth (14) of the electrical machine (5) have recesses (16) along which the projections (12) of the lamellae (10) are moved.

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