Electric motor with a stator housing

Abstract

Electric motor with a stator housing (1), wherein the stator housing (1) accommodates a laminated core with stator winding (3), wherein the stator housing (1) has a ring part (20) and a housing part (22) connected to the ring part (20), wherein the ring part (20) has a circumferential groove into which the housing part (22) is pressed, characterized in that Turbulators (4) are formed on the radial outer side of the housing part (22), wherein the ring part (20) has a further circumferential groove, wherein the further circumferential groove is arranged in the axial end face of the ring part (20) and the radial distance area covered by the further circumferential groove is independent of the circumferential angle, wherein the further circumferential groove has an undercut (24), wherein a cover plate (5) is connected to the housing part (22) by means of at least one seal, wherein the cover plate (5) is pressed into the further circumferential groove, wherein the cover plate (5) at least partially fills the undercut (24) of the further circumferential groove.

Description

[0001] The invention relates to an electric motor with a stator housing.

[0002] From DE 101 52 502 A1, the closest prior art is known an electric motor excited by permanent magnets, which has a stator and a rotor mounted so as to be rotatable relative to it.

[0003] From DE 10 2009 031 727 A1 a housing arrangement for a liquid-cooled electrical machine is known.

[0004] The invention is therefore based on the object of developing a motor that is as compact as possible, whereby the production should be as simple as possible.

[0005] According to the invention, the object is achieved in the electric motor according to the features specified in claim 1.

[0006] Important features of the invention in the electric motor are that it is provided with a stator housing, in particular wherein the stator housing accommodates a laminated core with stator winding, wherein the stator housing has a ring part and a housing part connected to the ring part, wherein the ring part has a circumferential groove, in particular annular groove, into which the housing part is pressed.

[0007] An advantage here is that the stator has a stator housing. This allows the bearings supporting the rotor to be accommodated in the stator housing. The ring part allows for a flange connection to a driven device. This is because the ring part can be manufactured with a much thicker wall than the pressed-in housing part. This allows for a higher load-bearing capacity. The pressed-in housing part is preferably cold-pressed during the pressing process and thus even flows. This allows for a stable and tight connection between the housing part and the ring part.

[0008] The circumferential groove can be made along the ring part. This means that the groove itself is also designed in a ring shape, with the corresponding ring axis corresponding to the ring axis of the ring part and thus also to the rotor rotation axis.

[0009] The groove cross-section can be designed not simply as a rectangular shape, but even with an undercut, i.e., a widening in the radial direction and / or counter to the radial direction. This allows the housing part to flow into the undercut during press-in, anchoring it in the ring part. This allows for a materially bonded, positive connection.

[0010] Preferably, the circumferential groove can be arranged on the axial end face, in particular on the end face of the ring part facing the housing part. Thus, the axial end region of the housing part intended for connection can be pressed in from the axial direction.

[0011] In this way, a connection between the housing part and the ring part can be easily created, whereby the connection is tight.

[0012] The ring part can be made of forged steel and the housing part from a tubular part, in particular from sheet steel.

[0013] In an advantageous embodiment, the ring axis of the ring part corresponds to the axis of rotation of the rotor and / or the circumferential groove is arranged in an axial end face of the ring part and / or the radial distance of the circumferential groove and / or the radial distance range covered by the circumferential groove is independent of the circumferential angle, particularly with respect to the axis of rotation. The advantage here is that the groove runs parallel to the ring part, meaning that the ring part can be designed as a rotating body with a groove cross-section provided in its cross-section.

[0014] In an advantageous embodiment, the housing part is tubular, in particular made of a sheet metal formed into a tube. This is advantageous because the housing part can be manufactured simply and cost-effectively by bending a sheet metal into a tube and welding the ends together.

[0015] In an advantageous embodiment, turbulators are formed on the radial outer side of the housing part. The advantage here is that cooling can be improved by increasing the turbulence.

[0016] In an advantageous embodiment, the circumferential groove has an undercut, in particular one that extends in the radial direction and / or counter to the radial direction. This is advantageous in that a stable, positive connection can be created by pressing. The pressing pressure is selected to be sufficiently high to achieve plastic flow of the material of the housing part pressed into the groove, or at least of the material pressed in the area of ​​the groove base.

[0017] In an advantageous embodiment, a cover plate is connected to the housing part by means of at least one seal, in particular wherein the cover plate covers at least a portion of the radially outer surface of the housing part, in particular to form a cooling channel between the cover plate and the housing part, A liquid such as water or oil is used as the cooling medium. The advantage of this is that it allows for improved cooling of the engine.

[0018] In an advantageous embodiment, the ring part has a further circumferential groove. This is advantageous because the cover plate can also be connected in the same way. Thus, the cover plate can be pressed into the ring part and, in turn, connected tightly and securely, particularly with a form-fitting and material-bonded connection, into the further groove by means of an undercut.

[0019] In an advantageous embodiment, the further circumferential groove is arranged in the axial end face of the ring part and / or the radial spacing of the further circumferential groove and / or the radial spacing range covered by the further circumferential groove is independent of the circumferential angle, in particular with respect to the axis of rotation. The advantage here is that the further groove and the groove for the housing part can be arranged at a constant spacing for all circumferential angles. Thus, the cover part can also be made from sheet metal and, by being pressed into the further groove, can be subjected to high pressure such that plastic flow of material areas of the cover part in the region of the groove can be achieved, so that the undercut formed on the further groove can be filled, thus achieving a stable and tight connection.

[0020] In an advantageous embodiment, the further circumferential groove has an undercut, in particular one that extends in the radial direction and / or counter to the radial direction. This is advantageous in that a stable and tight connection, in particular a material-to-material and form-fitting connection, can be achieved.

[0021] In an advantageous embodiment, the cover plate is pressed into the further circumferential groove. This is advantageous because it is easy to manufacture.

[0022] In an advantageous embodiment, the cover plate at least partially fills the undercut of the additional groove. This is advantageous because a positive connection can be achieved.

[0023] In an advantageous embodiment, the ring part at least partially fills the undercut of the circumferential groove. This is advantageous because a positive connection can be achieved.

[0024] In an advantageous embodiment, the housing part has a projection, in particular wherein the axial region covered by the projection is covered by or overlaps the axial region covered by the ring part. This is advantageous in that the introduction of the pressing force can be carried out in a simple manner. The projection protrudes in the radial direction and / or counter to the radial direction.

[0025] In an advantageous embodiment, the cover plate has a projection, in particular a bulge. This is advantageous because the pressing force can be easily applied.

[0026] In an advantageous embodiment, the cover plate is made of aluminum and / or the ring part is made of steel, in particular forged steel. This is advantageous in that a high degree of sealing can be achieved. The housing part is preferably made of sheet steel.

[0027] Further advantages emerge from the dependent claims. The invention is not limited to the combination of features in the claims. Further possible combinations of claims and / or individual claim features and / or features of the description and / or the figures will become apparent to those skilled in the art, particularly from the problem and / or the problem posed by comparison with the prior art.

[0028] The invention will now be explained in more detail with the aid of illustrations: In the Fig. 1 shows a stator according to the invention in a sectioned oblique view with a schematically illustrated stator housing 1. In the Fig. 2 shows a further stator in which the stator housing 1 is composed of a ring part 20 and a housing part 22, wherein the cover plate 5 is connected to the housing part 22. In the Fig. 3 shows another stator in which the cover plate is connected to the ring part.

[0029] As in Fig. As shown in Figure 1, the stator of the electric motor has a stator housing 1 that accommodates and at least partially surrounds a stator core 2. Stator windings 3 are housed in the stator core.

[0030] The stator housing 1 is oil- or water-cooled. For this purpose, turbulators 4 are formed on the stator housing 1, increasing the turbulence of the flow and thus reducing the overall heat transfer resistance from the hot winding 3 to the environment.

[0031] To form the cooling channel, a cover plate 5 is arranged on the outside of the stator housing 1 and tightly connected to it. This covers the cooling channel and the turbulators.

[0032] As in Fig. 2, the stator housing 1 of the Fig. 1 is now implemented by a ring part 20 and a housing part 22 cold-pressed therein.

[0033] The ring axis of the ring part 20 corresponds to the rotor shaft axis.

[0034] The ring part 20 has a circumferential groove, i.e., an annular groove, which has a radially outwardly directed undercut 24. Thus, during the production of the connection between the ring part 20 and the housing part 22, the housing part 22, which is designed as a tubular part, in particular a sheet metal tubular part, and is pressed into the groove, is cold-formed so that the material of the housing part 22 fills the groove and, in particular, swells and / or flows into the undercut.

[0035] In this way, the housing part 22 is tightly, in particular watertight, connected to the ring part 20.

[0036] The housing part 22 is preferably made of sheet metal, on the outside of which the turbulators 4 are formed. Furthermore, circumferential projections 23 are provided on the housing part 22, which protrude radially inward or radially outward.

[0037] The projections 23 serve to introduce a pressing force during production, i.e., to introduce a force with which the housing part 22 is pressed into the groove of the ring part. The pressing force is selected to be so large that the end region of the housing part 22 pressed into the groove is plastically deformed and thus becomes flowable, so that the groove bottom, including the undercut, is covered with material from the housing part 22.

[0038] On the outside of the housing part, a cover plate 5 is arranged, which is tightly connected to the housing part 22 by means of two sealing rings 21. The cooling channel including the turbulators 4 is arranged axially between the sealing rings 21.

[0039] The cover plate 5 is screw-connected and / or materially connected to the housing part 22, in particular welded and / or adhesively connected.

[0040] The cover plate 5 is preferably made of aluminum. The ring part 30 is made of steel, preferably as a forged part.

[0041] As in Fig. 3, in contrast to the Fig. 2 not only the housing part 32 is cold-pressed with the ring part 30, but also the cover plate 5. The turbulators are in turn embossed on the radial outer side of the housing part 32.

[0042] The cover plate 5 is pressed into a further circumferential groove, which is arranged concentrically to the first groove into which the housing part 22 is pressed. Thus, the cover plate 5 is also tightly connected to the ring part 30. A seal 21 is arranged on the end region of the housing part 22 and the cover plate 5 facing away from the ring part 30. For this purpose, an O-ring is preferably inserted between the housing part 22 and the cover plate 5.

[0043] The cover plate 5 has a projection 35, at which the pressing force for connecting the cover plate 5 to the ring part 30 can be introduced.

[0044] The further groove, into which the cover plate 5 is pressed, also has a radially extending undercut 34, into which material of the cover plate 5 flows when the cover plate 5 is pressed into the ring part 30.

[0045] The cover plate 5 is again preferably made of aluminum and the housing part 22 is made of sheet steel, in particular of a sheet steel tube.

[0046] The cover plate 5 is again tightly connected in the further groove, since it flows into the further undercut 34 when pressed in.

[0047] In a further embodiment of the invention, the cover plate 5 is not made of aluminum, but of steel. List of reference symbols 1 stator housing 2 stator laminations 3 stator windings 4 Turbulator 5 cover plate 20 Ring part, especially made of forged steel 21 Sealing ring 22 Housing part 23 lead 24 undercut 30 Ring part, especially made of forged steel 32 Housing part 33 lead 34 further undercut 35 protrusion, especially bulging

Claims

[1] Electric motor with a stator housing (1), wherein the stator housing (1) accommodates a laminated core with stator winding (3), wherein the stator housing (1) has a ring part (20) and a housing part (22) connected to the ring part (20), wherein the ring part (20) has a circumferential groove into which the housing part (22) is pressed, characterized by , that Turbulators (4) are formed on the radial outer side of the housing part (22), wherein the ring part (20) has a further circumferential groove, wherein the further circumferential groove is arranged in the axial end face of the ring part (20) and the radial distance area covered by the further circumferential groove is independent of the circumferential angle, wherein the further circumferential groove has an undercut (24), wherein a cover plate (5) is connected to the housing part (22) by means of at least one seal, wherein the cover plate (5) is pressed into the further circumferential groove, wherein the cover plate (5) at least partially fills the undercut (24) of the further circumferential groove. [2] Electric motor according to claim 1, characterized by that the ring axis of the ring part (20) corresponds to the axis of rotation of the rotor [3] Electric motor according to claim 1 or 2, characterized by that the circumferential groove is arranged in an axial end face of the ring part (20) [4] Electric motor according to claim 1, 2 or 3, characterized by that the radial distance range covered by the circumferential groove is independent of the circumferential angle. [5] Electric motor according to at least one of the preceding claims, characterized by that the housing part (22) is tubular, i.e. made of a sheet metal formed into a tube. [6] Electric motor according to at least one of the preceding claims, characterized bythat the circumferential groove has an undercut (24) which extends in the radial direction or counter to the radial direction. [7] Electric motor according to at least one of the preceding claims, characterized by , that the cover plate (5) covers at least a portion of the radially outer surface of the housing part (22) to form a cooling channel between the cover plate (5) and the housing part (22), where a liquid such as water or oil is used as the cooling medium. [8] Electric motor according to at least one of the preceding claims, characterized by that the undercut (24) extends in the radial direction or counter to the radial direction. [9] Electric motor according to at least one of the preceding claims, characterized by that the ring part (20) at least partially fills the undercut (24) of the circumferential groove. [10] Electric motor according to at least one of the preceding claims, characterized by , that the housing part (22) has a projection (23), wherein the axial region covered by the projection (23) is covered by or overlaps with the axial region covered by the ring part (20). [11] Electric motor according to at least one of the preceding claims, characterized by that the cover plate (5) has a projection (23). [12] Electric motor according to at least one of the preceding claims, characterized by that the cover plate (5) is made of aluminum and the ring part (20) is made of forged steel.

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