Electric motor having a stator housing with a continuous opening

Abstract

Electric motor having a stator housing comprising a continuous opening, wherein a retaining means is provided in the opening, said retaining means being at least partially surrounded by a potting compound, wherein electrical lines are guided through continuous holes in the retaining means and are at least partially surrounded by the potting compound.

Description

[0001] Electric motor with a stator housing having a through opening

[0002] Description:

[0003] The invention relates to an electric motor with a stator housing having a through opening.

[0004] It is generally known that an electric motor has a terminal box.

[0005] From DE 102007008 098 B4, an electrical connection design is known as the closest prior art.

[0006] An electric motor arrangement is known from EP 2 852 033 A1.

[0007] A sealing arrangement is known from US 6608414 B1.

[0008] The invention is therefore based on the objective of operating an electric motor with increased safety.

[0009] According to the invention, the problem is solved in the electric motor according to the features specified in claim 1.

[0010] Important features of the invention for the electric motor with a stator housing having a through opening are that a holding means is provided in the opening which is at least partially surrounded by potting compound, wherein electrical conductors are guided through through through recesses of the holding means and are at least partially surrounded by the potting compound.

[0011] An advantage of this method is that the electrical conductors are guided by the holding element before potting and are kept as parallel as possible to the ribs of the holding element. After potting, the electrical conductors are fixed within the holding element and sufficiently spaced from each other. This ensures that the insulation distance is maintained and increases safety. Furthermore, the interior of the junction box is separated.

[0012] ISI \ EIDOPAT 10.11 .2025 from the interior of the stator. Thus, a corresponding propagation of an explosion wave is prevented.

[0013] In an advantageous embodiment, the opening is sealed by means of the potting compound, in particular airtight. An advantage of this is that an explosion front is prevented from propagating.

[0014] In a preferred embodiment, the retaining element is manufactured as a plastic injection-molded part or assembled from plastic injection-molded parts. The advantage here is that cost-effective production is possible.

[0015] In an advantageous embodiment, the holding device comprises a first disk, a second disk, and webs, wherein the first disk is connected to the second disk via webs. It is advantageous that the electrical conductors are guided through recesses in the disks and thus run parallel to the webs in the space between the disks. This ensures that insulation distances are maintained. The webs define the distance between the two disks.

[0016] In an advantageous embodiment, the first disk has continuous recesses through which the electrical conductors protrude. It is advantageous that the electrical conductors are spaced apart from each other according to the hole pattern of the first disk, thus ensuring insulation distances.

[0017] In an advantageous embodiment, the second disk has continuous recesses through which the electrical conductors protrude. An advantage of this is that the electrical conductors are spaced apart from each other according to the hole pattern of the second disk, thus ensuring insulation distances.

[0018] In an advantageous embodiment, the hole pattern of the through-holes in the first disk is identical to the hole pattern of the through-holes in the second disk. It is advantageous that the electrical conductors run parallel to each other. In another advantageous embodiment, the through-holes in the first disk have a larger clear inner diameter than the other through-holes in the first disk. It is advantageous that both high-voltage and low-voltage conductors can be used as electrical conductors, in particular conductors with different cross-sectional areas.

[0019] In an advantageous embodiment, the first disk is arranged parallel to the second disk, in particular spaced apart.

[0020] In an advantageous embodiment, the axis of the first disk is aligned parallel to the axis of the second disk. It is advantageous that the electrical conductors are spaced apart and run parallel to each other, particularly in the area between the disks.

[0021] In an advantageous embodiment, the webs extend parallel to the respective section of an electrical conductor located between the first and second disks. This design is advantageous because the insulation distances between the electrical conductors are maintained.

[0022] In an advantageous embodiment, the first disc has a through-hole with a clear diameter larger than the clear diameter of the recesses in the first disc. It is advantageous that the filling hole can be positioned centrally and / or in the middle of the first disc, thus ensuring uniform filling with potting compound.

[0023] In a preferred embodiment, the first disk has a cylindrical outer contour. The advantages of this design are that it allows for simple manufacturing and that the opening can be filled to its maximum capacity.

[0024] In a preferred embodiment, the second disc has a cylindrical outer contour. This is advantageous because it allows for simple manufacturing and maximum filling of the opening. In a preferred embodiment, the electrical conductors in the area between the first and second discs are at least partially surrounded by the potting compound. This is advantageous because the conductors can be fixed in place by the potting compound.

[0025] In an advantageous embodiment, the stator housing has a screw thread integrated into the opening, which is filled with potting compound. The advantage here is that the potting compound is securely held in the opening and cannot be forced out by a pressure difference between the interior of the terminal box and the interior of the stator. This is because the hardened potting compound is held not only by a material bond but also by a form-fit connection to the screw thread. Thus, the potting compound remains in place even if the material bond fails.

[0026] In an advantageous embodiment, the potting compound has a helically shaped protrusion that projects radially from the central axis of the opening through the stator housing. The advantage of this is that the potting compound is securely held in the opening and cannot be forced out by a pressure difference between the interior of the terminal box and the interior of the stator. This is because the hardened potting compound is held not only by a material bond but also by a form-fit bond to the screw thread. Thus, the potting compound remains in place even if the material bond fails.

[0027] In an advantageous embodiment, the electrical lines comprise supply lines for the stator winding of the electric motor and supply lines for an electromagnetically actuated brake of the electric motor and / or for a fan motor of the electric motor. It is advantageous that the electrical lines allow an electrical supply through the plug, formed from potting compound and inserted into the opening, which prevents the propagation of an explosion front. The plug also contains the retaining element.

[0028] Further advantages arise from the dependent claims. The invention is not limited to the combination of features in the claims. For those skilled in the art, further meaningful combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent, particularly from the problem statement and / or the problem arising from a comparison with the prior art. The invention will now be explained in more detail with reference to schematic illustrations.

[0029] Figure 1 shows an electric motor according to the invention in longitudinal section, wherein a holding means 1 filled with potting compound 2 separates the interior of a terminal box of the electric motor from the interior of the stator of the electric motor.

[0030] Figure 2 shows the holding device 1 in an oblique view.

[0031] Figure 3 shows the holding device 1 filled with potting compound 2 in an oblique view.

[0032] Figure 4 shows the exploded area shown in Figure 3.

[0033] As shown in the figures, the electric motor has a pot-shaped stator housing4 which is closed by a lid-shaped bearing shield 3.

[0034] An axially through bore is arranged in the base of the pot-shaped stator housing 4, through which the rotor shaft of the electric motor projects. A stator lamination stack, in which the stator winding of the electric motor is mounted, is housed within the stator housing 4. A bearing flange is attached to the axial end face of the stator housing opposite the stator winding; this flange accommodates a bearing that rotatably supports the rotor shaft.

[0035] The bearing shield 3 is arranged on the end face of the stator housing 4 that is axially opposite the through bore and is connected to the stator housing. The bearing shield 3 covers the opening of the stator housing 4 and also accommodates a bearing of the rotor shaft for the rotatable mounting of the rotor shaft of the electric motor.

[0036] A continuous opening arranged laterally on the stator lamination stack 4 allows electrical lines 30 to be routed from the interior of the stator to the interior of a terminal box arranged on the outside of the stator housing.

[0037] A retaining element 1, which serves to guide electrical leads 30 and is encased in potting compound 2, is arranged in the opening of the stator lamination stack 4. The potting compound 2 thus seals the opening airtight, separating the interior of the terminal box from the interior of the stator. In particular, this prevents an explosion front from propagating through the opening.

[0038] The holding means 1 has a first disk 20 and a second disk 22 spaced apart from it, wherein, in particular, two webs 21 connect the two disks (20, 22) to each other.

[0039] The disks are aligned parallel to each other. The webs 21 extend parallel to the electrical conductors 30, and in particular parallel to the disk axis.

[0040] The first disk 20 has continuous cutouts 25 through which the electrical conductors 30 are passed. Similarly, the second disk 22 has continuous cutouts 23 through which the electrical conductors 30 are passed.

[0041] The first disc 20 has a further continuous recess, which serves as a filling hole 24 for the potting compound 2.

[0042] Before the potting compound 2 is poured, the holding agent 1 holds and guides the electrical conductors 30 in a direction parallel to the disk axis. After the potting compound 2 has hardened, the electrical conductors 30 are fixed within it. Thus, the holding agent 1 and / or the potting compound 2 keep the electrical conductors 30 spaced apart from each other.

[0043] If the radial outer contour of the two disks (20, 22) is cylindrical, the disk axis of the first disk 20 is coaxially aligned with the rotational symmetry axis of the first disk 20, in particular with the cylinder axis. The disk axis of the second disk 22 is coaxially aligned with the disk axis of the first disk 20.

[0044] The holding element 1 is preferably made of plastic, in particular as a one-piece plastic injection molded part or composed of plastic injection molded parts.

[0045] Both the retaining element 2 and the potting compound 2 contribute to the insulation strength. In particular, the opening of the stator housing 4 to the environment is covered by the terminal box, which is composed of a terminal box base and a terminal box top placed on top of it, wherein the terminal box base is connected to the stator housing either directly or via an intermediate plate placed between the terminal box base and the stator housing.

[0046] The hole pattern of the recesses 25 of the first disk 20 is similar to the hole pattern of the recesses 23 of the second disk 22, in particular where the two hole patterns are identical to each other.

[0047] Preferably, the first disk 20 has further recesses which, in contrast to the recesses 25, have a smaller clear diameter. In further embodiments of the invention, the retaining means 1 is made of metal, in which case the spacing of the electrical conductors 30 must be selected appropriately.

[0048] Reference symbol list

[0049] 1 Holding agent 2 Potting compound

[0050] 3 Storage sign

[0051] 4 Stator housings

[0052] 20 first disc

[0053] 21 Bridge 22 Second disc

[0054] 23 Exclusion

[0055] 24 Filling hole

[0056] 25 Exclusion

[0057] 30 electrical lines

Claims

Patent claims:

1. Electric motor with a stator housing having a through opening, characterized in that a holding means is provided in the opening which is at least partially surrounded by potting compound, wherein electrical conductors are guided through through through recesses of the holding means and are at least partially surrounded by the potting compound.

2. Electric motor according to claim 1, characterized in that the opening is sealed by means of the potting compound, in particular airtight.

3. Electric motor according to one of the preceding claims, characterized in that the holding means is manufactured as a plastic injection molded part or is composed of plastic injection molded parts.

4. Electric motor according to one of the preceding claims, characterized in that the holding means has a first disk, a second disk and webs, wherein the first disk is connected to the second disk via webs.

5. Electric motor according to one of the preceding claims, characterized in that the first disk has continuous recesses through which the electrical conductors protrude and / or that the second disk has continuous recesses through which the electrical conductors protrude.

6. Electric motor according to one of the preceding claims, characterized in that the hole pattern of the through recesses of the first disk is identical to the hole pattern of the through recesses of the second disk. - 11 - 7. Electric motor according to one of the preceding claims, characterized in that the through recesses of the first disk have a larger clear inner diameter than the clear diameter of further through recesses of the first disk.

8. Electric motor according to one of the preceding claims, characterized in that the first disk is arranged parallel to the second disk, in particular spaced apart, and / or that the disk axis of the first disk is aligned parallel to the disk axis of the second disk.

9. Electric motor according to one of the preceding claims, characterized in that the webs extend parallel to the respective section of an electrical conductor which is arranged between the first disk and the second disk.

10. Electric motor according to one of the preceding claims, characterized in that the first disk has a through filling hole, the clear diameter of which is larger than the clear diameter of the recesses of the first disk.

11. Electric motor according to one of the preceding claims, characterized in that the first disk has a cylindrical outer contour and / or that the second disk has a cylindrical outer contour. - 12 - 12. Electric motor according to one of the preceding claims, characterized in that the electrical conductors in the area between the first and the second disk are at least partially surrounded by the potting compound.

13. Electric motor according to one of the preceding claims, characterized in that the stator housing has a screw thread inserted into the opening, in particular which is filled with the potting compound.

14. Electric motor according to one of the preceding claims, characterized in that the potting compound has a helically shaped protrusion radially projecting with respect to the central axis of the opening through the stator housing.

15. Electric motor according to one of the preceding claims, characterized in that the electrical lines comprise supply lines of the stator winding of the electric motor and supply lines for an electromagnetically actuated brake of the electric motor and / or for a fan motor of the electric motor.

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