Laminated core with a winding and an insulating material

Abstract

Laminated core (1), namely rotor and / or stator laminated core of an electrical machine, with slots (2) extending axially through the laminated core (1) and at least one winding (4) introduced into the slots (2) to form end connections at at least one axial end (3) of the laminated core (1), wherein an insulating means (6) is arranged at least at this axial end (3) of the laminated core (1), namely at the end face (5) of the laminated core (1) at this axial end (3), characterized in that the insulating means (6) completely or partially encloses at least the end face (5) of the laminated core (1) and directly or indirectly partially encloses the part of the winding (4) extending axially out of the respective slot (2), close to the end face.

Description

Field of the invention

[0001] The present invention relates to a laminated core, namely a rotor and / or stator laminated core of an electrical machine, with slots extending axially through the laminated core and at least one winding inserted into the slots to form end connections at at least one axial end of the laminated core. State of the art

[0002] A variety of different variants are known from the prior art for the insulation between a slotted laminated core, for example, a stator laminated core and / or a rotor laminated core of an electrical machine, and the winding inserted into the slots of the laminated core to form end connections. For example, a slot insulation center, such as a slot insulation sleeve, can be inserted into the respective slots. The insulation of the winding itself is also known. Furthermore, insulation on the outer surfaces of the laminated core by means of attached insulating end disks is also disclosed.

[0003] All of these exemplary insulation variants require insulation between the laminated core and the winding, but their implementation is often very complex and they significantly influence the design of the laminated core and / or the winding.

[0004] Particularly in the winding extension area between an axial end of the laminated core and the point where the winding bends to form a face connection, i.e., the winding head, functionally effective insulation often leads to an unnecessary axial extension of the winding head. In this area, as in the rest of an electrical machine, creepage and clearance distances must be maintained to ensure adequate electrical insulation between the winding and the laminated core. The creepage and clearance distances are determined by several factors, such as the voltage and the insulating material.

[0005] The typical insulation solution in this area, in addition to the use of an insulating end plate as already explained above, is for the insulating slot lining to protrude axially from the slot at a distance sufficient to meet the insulation requirements for creepage and clearance distances. Only after the slot lining extension ends can the conductors be bent to form the winding head.

[0006] The slot liner protruding from the slot is also required to protect the winding from contact with the sharp edge of the stator core. However, this aforementioned distance is much smaller than the axial overhang required to maintain creepage and clearance distances.

[0007] This approach provides the necessary insulation to maintain creepage and clearance distances, but it results in an unwanted axial extension of the winding, which is simply necessary to achieve adequate insulation. The axial extension of the slot insulation (slot lining) out of the laminated core directly impacts the axial extension of the winding. The axial extension of the winding in this area negatively impacts the mass of the passive conductor (i.e., material consumption), Joule losses, the stray inductance of the winding head, and the overall length of the electrical machine. Summary of the invention

[0008] It is an object of the invention to provide an improved laminated core, in particular an improved stator laminated core and / or an improved rotor laminated core for an electrical machine, which is characterized primarily by an axially shortened winding head.

[0009] This need can be met by the subject matter of the present invention according to independent claim 1. Advantageous embodiments of the present invention are described in the dependent claims.

[0010] In the following, features, details and possible advantages of a device according to embodiments of the invention are discussed in detail.

[0011] The laminated core according to the invention, namely the rotor and / or stator laminated core of an electrical machine according to the invention, has grooves extending axially through the laminated core and at least one winding introduced into the grooves to form end connections at at least one axial end of the laminated core.

[0012] According to the present invention, an insulating means is arranged at least at this axial end of the laminated core, namely at the end face of the laminated core at this axial end.

[0013] According to the invention, the insulation means is designed such that it completely or partially encloses at least the end face of the laminated core and directly or indirectly partially encloses the part of the winding extending axially out of the respective slot, close to the end face.

[0014] In a particularly preferred embodiment of the present invention, a slot insulation means is arranged in the respective slot, which extends axially out of the respective slot and partially covers the part of the winding extending axially out of the respective slot, wherein at least the slot insulation means extending axially out of the respective slot is at least partially enveloped by the insulation means, so that the part of the winding extending axially out of the respective slot is indirectly partially enveloped by the insulation means near the end face.

[0015] The geometry of the insulation does not correspond to the geometry of the respective slot. Due to the different geometry of the insulation and the respective slot, an overlap can occur between the insulation and the slot insulation of the respective slot of the stator core. Accordingly, the end-face insulation is usually larger than the geometry of the slot.

[0016] The insulating agent is preferably a liquid or vaporous material that solidifies under defined conditions and / or within a defined period of time. The insulating agent is electrically insulating.

[0017] The proposed inventive solution makes it possible to reduce the axial extension of the winding and, optionally, the slot insulation, while still ensuring sufficient insulation to meet creepage and clearance requirements. Reducing the axial extension of the winding in the area of ​​the end connections, i.e., in the area of ​​the winding head, reduces the mass of the passive conductors, Joule losses, the stray inductance of the winding head, and the overall length of the electrical machine. This improves the overall performance of the electrical machine and reduces the costs and mass of the electrical machine and thus of the electrical drive unit. Brief description of the drawings

[0018] The invention is described below by way of example with reference to the drawings. Fig. 1 shows a schematic detailed sectional view of a laminated core with a winding and an insulating means in a first embodiment. Fig. 2 shows a schematic detailed sectional view of a laminated core with a winding and an insulating means in a second embodiment. Fig. 3 shows a schematic detailed sectional view of a laminated core with a winding and an insulating means in a third embodiment. Detailed description of the invention

[0019] In Fig. 1 to Fig. 3 shows different embodiments of a laminated core 1 according to the invention with a winding 4 and an insulating means 6.

[0020] The laminated core 1 is essentially hollow-cylindrical and has a plurality of circumferentially evenly distributed grooves 2 extending axially through the laminated core 1.

[0021] Furthermore, the laminated core 1 has a winding 4 introduced into the slots 2 to form end connections, i.e. a winding head, at at least one axial end 3 of the laminated core 1.

[0022] An insulating means 6 is arranged at this axial end 3 of the laminated core 1, namely at the end face 5 of the laminated core 1 at this axial end 3.

[0023] The insulating means 6 is designed as a liquid or vaporous, electrically insulating material that solidifies under defined circumstances and / or a defined period of time.

[0024] The insulation means 6 is designed in such a way that it completely insulates at least the end face 5 of the laminated core 1 and the part of the winding 4 extending axially out of the respective slot 2 directly ( Fig. 3) or indirectly ( Fig. 1, Fig. 2) partially covered, close to the frontal surface.

[0025] The insulation means 6 covers the end face 5 of the laminated core 1 in all three design variants according to Fig. 1 to Fig. 3 completely.

[0026] In each of the three versions according to Fig. 1 to Fig. 3, a slot insulation means 7 is arranged in each of the slots 2, which extends axially out of the respective slot 2 and partially covers the part of the winding 4 extending axially out of the respective slot 2.

[0027] In the first version according to Fig. 1, the insulation means 6 extends to the edge of the groove 2. As a result, only the area of ​​the part of the groove insulation means 7 extending axially out of the respective groove 2 is enveloped by the insulation means 6 at the joint between this and the insulation means 6 covering the end face 5.

[0028] In the second variant according to Fig. 2, the insulation means 6 extends axially onto the slot insulation means 7. Almost the entire area of ​​the part of the slot insulation means 7 extending axially out of the respective slot 2 is encased by the insulation means 6, which completely covers the end face 5 of the laminated core 1. The slot insulation means 7 and the insulation means 6 have almost the same axial extent.

[0029] In the third variant according to Fig. 3, the insulation means 6 extends axially over the slot insulation means 7 onto the winding 4. The entire area of ​​the part of the slot insulation means 7 extending axially out of the respective slot 2 is encased by the insulation means 6, which completely covers the end face 5 of the laminated core 1. The slot insulation means 7 has a reduced axial extent compared to the insulation means 6.

[0030] The insulating means 6 can also extend into a respective groove 2 if necessary.

[0031] Any combination of the individual design variants of the insulating means 6 listed above is also conceivable. List of reference symbols 1 sheet package 2 grooves 3 Axial end (of the laminated core) 4 windings 5 Frontal surface 6 Insulation center 7 Slot insulation

Claims

[1] Laminated core (1), namely rotor and / or stator laminated core of an electrical machine, with slots (2) extending axially through the laminated core (1) and at least one winding (4) introduced into the slots (2) to form end connections at at least one axial end (3) of the laminated core (1), wherein an insulating means (6) is arranged at least at this axial end (3) of the laminated core (1), namely at the end face (5) of the laminated core (1) at this axial end (3), characterized by that the insulating means (6) completely or partially encloses at least the end face (5) of the laminated core (1) and the part of the winding (4) extending axially out of the respective slot (2) directly or indirectly, close to the end face. [2] Laminated core (1) according to claim 1, characterized byin that a slot insulation means (7) is arranged in the respective slot (2), which extends axially out of the respective slot (2) and partially covers the part of the winding (4) extending axially out of the respective slot (2), wherein at least the slot insulation means (7) extending axially out of the respective slot (2) is at least partially enveloped by the insulation means (6), so that the part of the winding (4) extending axially out of the respective slot (2) is indirectly partially enveloped by the insulation means (6) close to the end face. [3] Laminated core (1) according to claim 1 or 2, characterized by that the insulating agent (6) is a liquid or vaporous material which solidifies under defined circumstances and / or a defined period of time.

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