Electric motor having a laminated stator core, a bearing flange and a connection box

Abstract

The invention relates to an electric motor having a laminated stator core, a bearing flange and a bearing shield, wherein the bearing flange has through-apertures, wherein a connection box lower part is fastened to the bearing flange via an intermediate plate, wherein the intermediate plate bears against the connection box lower part, wherein a connection box upper part covers an opening in the connection box lower part and is connected to the connection box lower part on the side of the connection box lower part that faces away from the bearing flange, wherein a first seal is arranged between the intermediate plate and the connection box lower part, wherein the intermediate plate has a raised portion which protrudes toward the connection box upper part and against which the first seal bears.

Description

[0001] Electric motor with a stator lamination stack, a bearing flange and a bearing shield

[0002] Description:

[0003] The invention relates to an electric motor with a stator lamination stack, a bearing flange and a bearing shield.

[0004] It is generally known that an electric motor has a terminal box for connecting the stator winding wire to electrical supply lines coming from the environment.

[0005] The invention is therefore based on the objective of further developing an electric motor, whereby the cooling of the electric motor is to be improved.

[0006] According to the invention, the problem is solved in the electric motor according to the features specified in claim 1.

[0007] Important features of the invention in the electric motor are that the electric motor is provided with a stator lamination stack, a bearing flange and a bearing shield, wherein the bearing flange has through-holes,

[0008] wherein a terminal box base is attached to the bearing flange via an intermediate plate,

[0009] where the intermediate plate rests against the bottom of the junction box,

[0010] wherein a terminal box upper part covers an opening of the terminal box lower part and is connected to the terminal box lower part on the side of the terminal box lower part facing away from the bearing flange,

[0011] wherein a first seal is arranged between the intermediate plate and the terminal box base,

[0012] the intermediate plate has a protrusion extending towards the top of the connection box, against which the first seal rests.

[0013] ISI \ EIDOPAT 13.11.2025 An advantage of this is that the intermediate plate absorbs a heat flow from the bearing flange, thus contributing to improved heat dissipation. This allows for improved heat dissipation. Furthermore, the intermediate plate's continuous recess enables a connection between the air inside the terminal box and the air inside the bearing flange. This further extends the heat flow even to the terminal box, thus improving heat transfer to the environment via the increased surface area.

[0014] In an advantageous embodiment, the bearing shield is identical to the bearing flange. The advantage here is that only one type of part needs to be stocked during production.

[0015] In an advantageous embodiment, those recesses not covered by the terminal box formed by the lower and upper parts are each covered by a respective cover element. The advantage here is that the airflow from the interior of the bearing flange can escape into the surrounding environment through these latter recesses.

[0016] In a preferred embodiment, a fan device is attached to the bearing shield, which directs an airflow through one of the recesses of the bearing shield into the interior of the bearing shield. The advantage of this is that the cooling is improved.

[0017] In an advantageous embodiment, the respective cover part has a lamellar structure. An advantage of this is that

[0018] In particular, the louver structure is designed with louvers directed away from the connection box, especially so that the airflow is allowed to exit in a direction away from the connection box. It is advantageous that

[0019] In an advantageous embodiment, the interior of the bearing shield is connected to the interior of the bearing flange via recesses extending through the stator lamination stack, particularly in the axial direction. This allows airflow from the interior of the bearing shield through the recesses in the stator lamination stack into the interior of the bearing flange, and furthermore, the airflow from the interior of the bearing flange flows between the fins of the fin structure into the vicinity of the electric motor. An advantage of this is that the stator lamination stack is cooled by the airflow, thus improving cooling.

[0020] In an advantageous embodiment, the fan device has a fan driven by an electric motor drive,

[0021] wherein the axis of rotation of the fan is aligned parallel to the axis of rotation of the rotor shaft of the electric motor,

[0022] In particular, the axial direction is aligned parallel to the axis of rotation of the rotor shaft of the electric motor, and the circumferential direction is relative to the axis of rotation of the rotor shaft, as is the radial direction. An advantage of this is that the strength of the airflow is independent of the rotational speed of the rotor shaft.

[0023] In an advantageous embodiment, the intermediate plate has a projection on its side facing the terminal box base, in which a recess extending through the intermediate plate is located.

[0024] wherein the bearing flange has a continuous recess which adjoins the recess of the intermediate plate,

[0025] wherein the terminal box lower part has a continuous recess which adjoins the recess of the intermediate plate, in particular such that the interior area surrounded by the terminal box is connected to the recess of the intermediate plate with the interior area surrounded by the bearing flange,

[0026] In particular, wherein a web traverses the recess of the intermediate plate, and especially wherein cables or electrical conductors carrying different voltages can be separated from one another by means of the web. It is advantageous that the raised section increases the heat capacity of the intermediate plate and thus peak temperatures can be reduced. In an advantageous embodiment, slot nuts are inserted at the corner regions of the cuboid-shaped stator lamination stack into axially continuous grooves in the stator lamination stack that taper towards the surroundings.

[0027] In particular, the T-nuts are positively locked in the radial direction within the stator lamination stack. An advantage of this design is that, unlike the stator lamination stack, which is constructed from individual stacked laminations, the T-nuts are each manufactured as a single piece and thus conduct a portion of the heat flow without heat transfer.

[0028] In an advantageous embodiment, respective retaining plate areas are formed on the bearing flange.

[0029] which are in contact with the T-nuts, in particular which are in contact with the axially forward or rear end face of the T-nuts,

[0030] In particular, the respective retaining plate area is pressed against the respective T-nut by a screw passing through the respective retaining plate area and screwed into an axially directed threaded bore, especially by the screw head. It is advantageous that the retaining plate areas are pressed against the T-nuts by screws, which can be screwed into the solid T-nuts.

[0031] In an advantageous embodiment, the retaining plate areas extend further circumferentially than the respective T-nut. It is advantageous that the T-nuts overlap circumferentially, thus providing a sufficiently large contact area to ensure low thermal resistance.

[0032] In an advantageous embodiment, the bearing shield, including its retaining plate areas, is manufactured in one piece, particularly as a single unit. An advantage of this design is that high contact forces can be achieved.

[0033] In an advantageous embodiment, the bearing flange, including its retaining plate areas, is manufactured in one piece, particularly as a single unit. This design offers the advantage of enabling high connection forces. In another advantageous embodiment, only the respective retaining plate area protrudes radially from the bearing flange within the area circumferentially covered by the retaining plate area, particularly to provide clearance for operating the respective screw screwed into the respective T-nut. This design offers the advantage of allowing the screws to be operated easily and without obstruction.

[0034] In an advantageous embodiment, only the respective retaining plate area protrudes radially from the bearing shield in the area covered circumferentially by the respective retaining plate area, particularly to provide clearance for actuating the respective screw screwed into the respective T-nut. The advantage here is that simple actuation is achievable.

[0035] In an advantageous embodiment, each retaining plate area of ​​the bearing flange comprises the outermost surface area of ​​the bearing flange in the radial direction. It is advantageous that the T-nuts can be overlapped not only circumferentially but also radially.

[0036] In an advantageous embodiment, each retaining plate area of ​​the bearing shield has and / or encompasses the outermost surface area of ​​the bearing shield in the radial direction. The advantage here is that the T-nut is radially covered, thus enabling efficient heat transfer.

[0037] In an advantageous embodiment, the raised section of the bearing flange projects beyond the first seal in the radial direction at each circumferential position.

[0038] In particular, the area covered radially by the contact surface between the terminal box base and the first seal differs from the area covered radially by the protrusion. It is advantageous that the first seal rests laterally, thus arranging the contact forces within a tangential plane relative to the axis of rotation of the rotor shaft.

[0039] Further advantages arise from the dependent claims. The invention is not limited to the combination of features of 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, in particular 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:

[0040] Figure 1 shows an electric motor according to the invention in an oblique view.

[0041] Figure 2 shows the area of ​​the electric motor having a bearing flange 1 in an oblique view.

[0042] Figure 3 shows an intermediate plate 21 of the electric motor in oblique view.

[0043] Figure 4 shows the bearing flange 1 from a different viewing direction in an oblique view.

[0044] Figure 5 shows a stator lamination stack 2 of the electric motor in oblique view.

[0045] As shown in the figures, the electric motor has a stator lamination stack 2 which is arranged axially between the bearing flange 1 and a bearing shield 3, in particular bearing flange.

[0046] In the bearing flange 1 a bearing is received for the rotatable support of the rotor shaft of the electric motor, wherein a second bearing for the rotatable support of the rotor shaft is received in the bearing shield 3.

[0047] The axial direction is aligned parallel to the axis of rotation of the rotor shaft. The circumferential and radial directions are each also referenced to the axis of rotation of the rotor shaft.

[0048] Stator lamination stack 2 houses a stator winding of the electric motor. Stator lamination stack 2 consists of individual laminations stacked axially on top of each other, which are manufactured as stamped parts.

[0049] Preferably, the bearing shield 3 and the bearing flange 1 are identical in construction, in particular identical to each other. A connection box is attached to the bearing flange 1 via an intermediate plate 21. For this purpose, the intermediate plate 21 is placed on the bearing flange 1.

[0050] A terminal box base 4 is placed on the intermediate plate 21, with a seal 23 being arranged between the terminal box base 4 and the intermediate plate 21.

[0051] Another seal 20 is arranged between the bearing flange 1 and the intermediate plate 21.

[0052] The intermediate plate 21 has a recess 30 which adjoins a continuous recess of the bearing flange 1 and a continuous recess of the terminal box base 4. Thus, the interior area surrounded by the bearing flange 1 is connected to the interior area of ​​the terminal box.

[0053] A terminal box upper part 5 covers a further opening of the terminal box lower part 4 on the side facing away from the intermediate plate 21. Electrical supply lines are guided into the interior of the terminal box formed by the terminal box lower part 4 and the terminal box upper part 5 by means of cable glands and are electrically connected to the stator windings at connection elements located there.

[0054] The seals 20 and 23 run around the recess 30 of the intermediate plate 2.

[0055] Preferably the seals 20 and 23 are rectangular in shape. The recess 30 is rectangular in shape, in particular it has the form of a rectangular surface, especially with rounded corners.

[0056] A bridge 41 passes through the recess 30 of the intermediate plate 21. Thus, cables or electrical conductors carrying different voltages can be separated from each other by means of the bridge 41. In this way, safety is increased.

[0057] At the corner regions of the cuboid stator lamination stack, T-nuts 50 are inserted into axially continuous grooves in the stator lamination stack that taper towards the surrounding area. Thus, the T-nuts 50 are positively locked in the stator lamination stack 2 in the radial direction. Since the T-nuts 50 are made of solid material, in particular steel or aluminum, threaded holes can be drilled into the T-nuts 50, allowing components to be attached to or connected to the electric motor.

[0058] In particular, respective retaining plate areas 7 of the bearing flange 1 or the bearing shield 3 can be arranged at the axially forward and rear ends of the respective T-nut 50, which are pressed against the respective T-nut 50 by screws passing through the retaining plate areas 7 and screwed into axially directed threaded bores, in particular by the respective screw head of the respective screw. The retaining plate areas 7 extend circumferentially further than the respective T-nut 50.

[0059] For the operation of the screws, the retaining plate areas 7 of the bearing flange 1 and the bearing shield 3 are accessible from the axial direction on the side facing away from the stator lamination stack 2, because both the bearing flange 1 and the bearing shield 3 have a corresponding radially directed recess.

[0060] The bearing shield 3, including its retaining plate areas 7, is manufactured in one piece, in particular as a single unit. Likewise, the bearing flange 1, including its retaining plate areas 7, is manufactured in one piece, in particular as a single unit.

[0061] The stator lamination stack 2 has axially through recesses 51 which function as cooling channels.

[0062] The fan device 6 conveys an airflow into the interior area surrounded by the bearing shield 3, from which the airflow flows through the recesses 51 of the stator lamination stack 2 into the interior area surrounded by the bearing flange 1.

[0063] Since the bearing flange 1 has radially continuous recesses spaced apart circumferentially, the airflow exits through these recesses into the surrounding environment. The airflow thus cools the electric motor, in particular the stator lamination stack 2 and therefore the respective stator winding housed within the stator lamination stack. The recesses on the bearing flange 1 are all identically shaped, but spaced apart circumferentially. The recesses of the bearing flange 1 not covered by the intermediate plate 21 or the terminal box are covered by cover elements 8, which have a lamellar structure with downward-facing lamellae. This allows the airflow to exit downwards, i.e., towards the side facing away from the terminal box, from the interior of the bearing flange 1. Rainwater or splash water coming from above is prevented from entering.However, if water should penetrate this interior area, it can drain away on the side facing away from the junction box through the recesses located there.

[0064] The intermediate plate 21 has a rectangular protrusion 22 on its side facing the terminal box, against which the seal 23 rests, the seal 23 sealing towards the terminal box base 4.

[0065] In further embodiments of the invention, instead of the external fan device 6, which has its own electric motor drive, a fan non-rotatably connected to the rotor shaft of the electric motor is used to draw in the airflow through the recesses of the bearing shield 3. Reference numeral list

[0066] 1 bearing flange

[0067] 2 Stator lamination package

[0068] 3 Bearing plate, in particular bearing flange 4 Junction box base

[0069] 5 Junction box top

[0070] 6 fan device

[0071] 7 Mounting plate area

[0072] 8 Cover part

[0073] 20 Seal

[0074] 21 Intermediate plate

[0075] 22 Survey

[0076] 23 Seal

[0077] 30 Exclusion

[0078] 40 Exclusion

[0079] 41 Bridge

[0080] 50 T-nuts

[0081] 51 exceptions

Claims

Patent claims:

1. Electric motor with a stator lamination stack, a bearing flange and a bearing shield, characterized in that the bearing flange has continuous recesses, wherein a terminal box base is attached to the bearing flange via an intermediate plate, where the intermediate plate rests against the bottom of the junction box, wherein a terminal box upper part covers an opening of the terminal box lower part and is connected to the terminal box lower part on the side of the terminal box lower part facing away from the bearing flange, wherein a first seal is arranged between the intermediate plate and the terminal box base, wherein the intermediate plate has a protrusion projecting towards the top of the terminal box, against which the first seal rests.

2. Electric motor according to claim 1, characterized by the fact that The bearing shield is identical in design to the bearing flange.

3. Electric motor according to any of the preceding claims, characterized by the fact that Those recesses which are not covered by the junction box formed from the junction box base and the junction box top are each covered with a respective cover part.

4. Electric motor according to any of the preceding claims, characterized by the fact that A fan device is attached to the bearing shield, which directs an airflow through one of the recesses of the bearing shield into the interior of the bearing shield.

5. Electric motor according to any of the preceding claims, characterized by the fact that the respective cover part has a lamellar structure, in particular wherein the louver structure is designed with louvers directed away from the connection box, in particular so that an exit of the airflow in a direction away from the connection box is made possible.

6. Electric motor according to any of the preceding claims, characterized by the fact that the interior area of ​​the bearing shield is connected to the interior area of ​​the bearing flange via recesses extending through the stator lamination stack, particularly in the axial direction, so that the airflow from the interior area of ​​the bearing shield passes through the recesses of the stator lamination stack into the interior area of ​​the bearing flange, in particular, wherein the airflow from the interior area of ​​the bearing flange between the lamellae of the lamella structure flows into the vicinity of the electric motor.- 14- 7. Electric motor according to any of the preceding claims, characterized by the fact that the fan device has a fan driven by an electric motor drive, wherein the axis of rotation of the fan is aligned parallel to the axis of rotation of the rotor shaft of the electric motor, in particular wherein the axial direction is aligned parallel to the axis of rotation of the rotor shaft of the electric motor and the circumferential direction is related to the axis of rotation of the rotor shaft and the radial direction is related to the axis of rotation of the rotor shaft.

8. Electric motor according to any of the preceding claims, characterized by the fact that the intermediate plate has a raised section on its side facing the lower part of the junction box, in which a recess extending through the intermediate plate is present, wherein the bearing flange has a continuous recess which adjoins the recess of the intermediate plate, wherein the terminal box lower part has a continuous recess which adjoins the recess of the intermediate plate, in particular such that the interior area surrounded by the terminal box is connected to the recess of the intermediate plate with the interior area surrounded by the bearing flange, in particular wherein a bridge crosses the recess of the intermediate plate, in particular wherein cables or electrical conductors carrying different voltages can be separated from each other by means of the bridge.- 15- 9. Electric motor according to any of the preceding claims, characterized by the fact that at the corner areas of the cuboid-shaped stator lamination stack, slotted blocks are inserted into grooves of the stator lamination stack that taper towards the surroundings and extend axially. in particular so that the slot nuts are positively locked in the stator lamination stack in the radial direction.

10. Electric motor according to any of the preceding claims, characterized by the fact that The respective retaining plate areas are formed on the bearing flange. which are in contact with the T-nuts, in particular which are in contact with the axially forward or rear end face of the T-nuts, in particular wherein the respective retaining plate area is pressed against the respective T-nut by a screw passing through the respective retaining plate area and screwed into an axially directed threaded bore, in particular by the screw head of the screw.

11. Electric motor according to any of the preceding claims, characterized by the fact that The retaining plate areas extend further in the circumferential direction than the respective T-nut.- 16- 12. Electric motor according to any of the preceding claims, characterized by the fact that the bearing shield, including its mounting plate areas, is manufactured in one piece, in particular in one piece. and / or that the bearing flange, including its retaining plate areas, is manufactured in one piece, in particular in one part.

13. Electric motor according to any of the preceding claims, characterized by the fact that In the area covered circumferentially by the respective retaining plate area, only the respective retaining plate area protrudes radially at the bearing flange, in particular to provide clearance for actuating the respective screw screwed into the respective T-nut. and / or that In the area covered in the circumferential direction by the respective retaining plate area, only the respective retaining plate area protrudes radially from the bearing shield, in particular to provide a clearance for actuating the respective screw screwed into the respective T-nut.

14. Electric motor according to any of the preceding claims, characterized by the fact that The respective retaining plate area of ​​the bearing flange each comprises the outermost surface area of ​​the bearing flange in a radial direction. and / or that The respective retaining plate area of ​​the bearing shield each comprises the outermost surface area of ​​the bearing shield in a radial direction.- 17- 15. Electric motor according to any of the preceding claims, characterized by the fact that At each circumferential position, the raised section of the bearing flange projects beyond the first seal in the radial direction. in particular wherein the area covered in the radial direction by the contact surface between the terminal box base and the first seal differs from the area covered in the radial direction by the protrusion.

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