Shell-less electric rotary machine with additional elements

Abstract

The invention relates to a housing-free electric rotary machine (1), comprising a stator (2) and a rotor (3), which is rotatably mounted about an axis (6) and is spaced apart from the stator (2) by an air gap (5), the stator (2) having a substantially hollow cylindrical magnetizer, the magnetizer having a plurality of jaws (15) distributed over the magnetizer periphery (52), the jaws (15) being arranged in the form of a clamp, the two jaws (15), which are arranged opposite one another in the form of a clamp, form an axially extending groove structure (16) in which at least one mounting element (10) can be accommodated, which mounting element can be moved axially and / or about its own axis in the groove structure (16), the mounting element (10) being connectable to an additional element (12) by means of a connecting element (11), in particular a screw, in this way, a complementary contact area (13) of the outer section (18) of the jaw (15) with the counter surface (19) of the additional element (12) is generated in sections, and the wedge effect causes a wedge effect on the complementary contact area (13).

Description

Technical Field

[0001] The invention relates to a housingless electric rotating machine having one or more additional elements. Background Art

[0002] Electric rotating machines, in particular motors in industrial environments, are usually designed with a housing. In particular, housings made of aluminum or gray cast iron are used. The housing is placed on the stator by means of cold or shrink fit.

[0003] The tasks of the housing include, but are not limited to, cooling the electric motor, in particular cooling the stator, and providing connection possibilities, such as flanges, support feet, etc.

[0004] Therefore, most industrial motors (about 50%) are designed as conventional motors. These legs are usually welded, cast or screwed to the housing.

[0005] A damaged housing is often a reason to throw away the entire motor, as repairs are sometimes difficult.

[0006] Furthermore, the housing limits the cooling efficiency of the electric motor.

[0007] Therefore, there are also caseless electric motors.

[0008] Thus, DE 20 37 769 A1 discloses a surface-cooled, housingless electric motor with a bearing cover which is supported on a stator laminated core consisting of rectangular laminations, wherein the stator laminations have teeth formed partially or over the entire outer circumference so that they can be stamped out of a strip material without a grid.

[0009] DE 78 13 179 U1 discloses a housingless electric machine, preferably an electric motor, having a rotor and a laminated stator core package, on both end faces of which bearing caps are arranged, wherein at least one dovetail guide extending parallel to the longitudinal axis of the rotor shaft of the electric machine and formed by the stator laminated core is arranged on the circumference of the stator laminated core, the dovetail guide guiding and supporting at least one component of the electric machine in a linear manner in a form-fitting manner, which component is prevented from axial displacement in its operating position.

[0010] US 2006 / 284511 A1 discloses a motor comprising a stator core formed of a plurality of stator laminations and at least partially forming the outer peripheral surface of the motor. Each stator portion has a plurality of ribs extending radially outward. During assembly, the ribs of adjacent laminations together form a larger rib extending over the length of the stator core. These laminations improve the cooling of the motor by improving the heat dissipation of the motor.

[0011] From EP 3 944 465 A1 a housingless electric rotating machine with a stator is known.

[0012] The stator has a material layer structure, wherein the material layer structure has a plurality of material layers, wherein the material layers are arranged in sequence along the rotation axis,

[0013] The material layer structure has a plurality of thickened portions and a plurality of grooves, wherein a groove is arranged between two thickened portions,

[0014] wherein at least one recess is designed such that at least one slot wedge can be received, wherein at least one thickening is designed such that the slot wedge can be fixed,

[0015] wherein the end element is arranged at at least one axial end of the stator, wherein the end element is connected to the stator via at least one connecting element,

[0016] wherein at least one slot wedge is arranged in at least one groove of the stator,

[0017] Therein, the connecting element is connected to at least one slot wedge.

[0018] A disadvantage of these known motors is that they are manufactured in a relatively complex manner and have unsuitable vibration characteristics during operation of the electric rotating machine. Summary of the invention

[0019] Based on this, an object of the present invention is to provide an electric rotating machine which has a relatively simple structure, has high compactness, high cooling efficiency, low vibration performance, and is also suitable for a wide variety of applications.

[0020] This object is achieved by a housingless electric rotating machine having a stator and a rotor, the rotor being mounted rotatably about an axis, the rotor being separated from the stator by an air gap,

[0021] The stator has a substantially hollow cylindrical magnet conductor.

[0022] The magnetizer has a plurality of jaws arranged in a clamp-like manner and distributed on the outer circumference of the magnetizer.

[0023] Therein, two jaws arranged opposite to each other in a pliers shape are implemented as an axially extending groove structure, at least one mounting element can be accommodated in the groove structure, and the mounting element can move axially and / or around its own axis in the groove structure, wherein the mounting element can be connected to the additional element by means of a connecting element, in particular a screw, so that complementary contact areas are generated in sections between the outer sections of the jaws and the corresponding surfaces of the additional element, and the mounting element causes a wedge effect on the complementary contact areas.

[0024] According to the invention, a groove structure or a prismatic geometry is created on the outer diameter of the stator (regardless of whether the stator is a one-piece magnetic conductor or a laminated core). This geometry can also be called a prismatic corresponding geometry or at least a partially prismatic corresponding geometry. Therefore, their adjoining areas are at least partially complementary to the corresponding surfaces of the additional element.

[0025] During the production process (stamping) of the laminated core, additional prismatic geometries are stamped out for the individual laminations, which ultimately result in prismatic receptacles at least partially in the axial direction for additional elements (eg feet, flanges, etc.) on the stacked laminated core of the stator.

[0026] According to this contour, the additional element is provided with matching, ie complementary, mutual geometries for fixing.

[0027] In the prismatic housing of the stator formed by the opposing jaws, an axially extending recess, i.e. a groove, can be provided in the inner region, into which the mounting elements are inserted. These mounting elements can be moved axially and / or about their own axis in the groove, which makes the insertion and orientation of the mounting elements in the groove easier.

[0028] According to the invention, the mounting element is designed to be arcuate, in particular circular, in cross section and has one thread turn or several thread turns, in particular thread turns oriented in pairs.

[0029] Thus, in a simple manner, each mounting element can be equipped with one or two or pairs of further fastening possibilities, making it possible to attach, in particular screw-on, various mounting feet or other additional elements.

[0030] When the additional element is screwed in, an increased holding effect is produced between the jaws and the additional element.

[0031] The mounting element causes the jaws to expand, which results in a wedge effect, ie tension on the complementary surfaces, ie the jaws and the additional element in the clamp-like arrangement.

[0032] This tensioning reduces undesired micro-movements on the additional elements, in particular the additional elements of the mounting feet, which micro-movements are caused by electromagnetic or mechanical imbalances of the caseless electric rotating machine.

[0033] Eliminating the mechanical interface (housing-stator) also has a positive effect on the vibration sensitivity of the entire system, i.e. the entire electric rotating machine.

[0034] The mounting system is therefore more rigid than relatively known foot mountings on the housing of, for example, an electric rotating machine.

[0035] Preferably, the strength value of the material of the mounting system is selected such that the deformation occurs due to the tensioning of the components involved (eg additional element, mounting element) within the elastic range.

[0036] This also makes it possible to disassemble and reassemble additional components.

[0037] Due to the mounting according to the invention, the additional element receives an adjustable pretensioning force which ensures additional safety against loosening of the additional element on the stator.

[0038] The mounting of the additional element according to the invention is therefore extremely safe both in radial and in axial direction.

[0039] Sharp edges of the end faces, in particular of the axial and / or radial outer laminations or lamination segments, are covered by the cover integrated into the bearing cap. The risk of injury at the sharp edges of the outer laminations is thus reduced. Flaking of the paint (after painting) at these edges is also avoided.

[0040] When mounted according to the invention, the additional element is fixed directly to the stator (i.e. without an interface housing) with a self-reinforcing holding effect. This achieves, in particular, a significantly higher stiffness of the mounting of the support foot or flange than when the support foot or flange is mounted to the housing. The additional natural frequency is higher, which enables reliable operation over a wide frequency band and thus also increases the speed of the electric rotating machine.

[0041] The key vibration movements, sway to the side and sway in length are reduced.

[0042] The function of mounting various additional elements is integrated into the stator, which enables a technically improved fixation in the case of a caseless electric rotating machine despite the omission of the housing.

[0043] In the case of a stator designed as a laminate, due to the high manufacturing accuracy of stamping technology, it is possible to dispense with surface machining of additional elements on the entire electric rotating machine. These surfaces can thus already be produced during the machining process, for example on a single foot. The permissible tolerances of the motor shaft height (foot surface to motor shaft) can be maintained by the foot tolerance and the assembly tolerance. This is the case with a maximum tolerance of 0.5 mm up to and including an axial height of 250 mm and a maximum permissible tolerance of 1 mm from an axial height of more than 25 mm.

[0044] In the case of flange motors (ie electric rotary machines without feet), the prismatic geometry serves as cooling ribs in its shaping.

[0045] The inside of the jaws (ie the inside of the groove) can be painted without any problems. Tolerances in the thickness of the paint layer can be compensated by the mounting element, since it functions without any problems in its radial position within a tolerance range of approximately 500 μm.

[0046] In one embodiment, an end element, in particular a bearing cover, is arranged on at least one axial end of the stator, wherein the end element is mechanically connected to the stator by means of at least one connecting element.

[0047] The groove structure is thus axially closed, wherein the encapsulation of the stator and the fixing of the bearing cover are accomplished by the end elements.

[0048] In an embodiment, at least one mounting element is arranged in at least one groove structure of the stator.

[0049] A plurality of mounting elements in the groove structure allows a wide variety of fixings of the caseless electric rotating machine, for example to a foundation.By choosing the feet and / or the positioning parts on the caseless electric rotating machine, its vibration characteristics can be influenced.

[0050] In embodiments where one, two or three mounting elements are provided per groove, feet and other additional elements can be attached, such as a transformer bracket, a junction box bracket, a junction box base, a monitoring device bracket or a transport hole or the like.

[0051] In order to further improve the cooling of the housingless electric rotating machine, the magnet conductor has cooling ribs which are oriented substantially radially or at least partially parallel to the outer circumference of the stator.

[0052] The additional element is at least partially provided with ribs, whereby a further cooling effect is produced.By tensioning the complementary surfaces, ie the jaws of the clamp-like arrangement with the additional element, heat can therefore be transferred from the laminated core to the additional element.

[0053] In order to further reduce eddy currents in a housingless electric rotating machine during operation, the magnet conductor is composed of laminations, wherein each lamination is implemented in one piece and has at least grooves for the winding system and jaws arranged in a clamp-like manner, wherein the laminations are axially stacked to form a laminated core of a stator having one or more groove structures.

[0054] The preferably stamped laminations are fixed to one another in a materially bonded manner, in particular glued and / or welded in sections or axially secured by tie rods.

[0055] Advantageously, the individual laminations are encapsulated with one another during or after the stamping process to form the stator core. This can be achieved particularly well by gluing the individual laminations over the entire surface.

[0056] The whole surface bonding also provides the advantage that each lamination is sealed to each other. In this way, good protection against contact, foreign matter and watertightness can be achieved.

[0057] Positioning of the mounting element is made easier if, in a caseless electric rotating machine, the end element is designed as a bearing cap and at least partially axially covers the axially extending groove.

[0058] In another embodiment, at least one end element has at least a part of a terminal box for supplying electrical energy to the electric rotating machine. This reduces the variety of components on the electric rotating machine.

[0059] The cooling ribs of the stator and the cooling ribs of the end element are advantageously arranged in axial alignment.

[0060] The stator, in particular the laminated core of the stator, is at least partially covered on its outer surface with a coating in order to provide protection against contact, corrosion, foreign bodies and water.

[0061] In an advantageous embodiment, the stator is provided with a coating, thereby providing a sealed, smooth and thus easy-to-clean surface. This is particularly important in particular in the medical field or in the food industry.

[0062] Furthermore, the coating is not only suitable for surfaces which form an insulation layer between the winding and the stator lamination in the inner region of the grooves.

[0063] For example, a metal coating can also be on the outer circumference. Conceivable are: galvanic coating, coating by thermal flame spraying or by pneumatic cold spraying and coating by an immersion process (eg galvanizing).

[0064] Preferably, only one coating type is applied which is suitable for the outer and inner regions of the stator. For example, resin-based coatings applied by painting or dipping are particularly suitable for this purpose. Electrostatic powder coating (for example, with subsequent heat treatment) is another possibility.

[0065] The metal coating advantageously has a thickness between 20 μm and 70 μm, in particular between 30 μm and 60 μm. The plastic coating has a value between 60 μm and 500 μm.

[0066] Coatings with lacquers and / or resins are also conceivable. These can be polyester-based (unsaturated) and / or epoxide-based. Silicones are also conceivable.

[0067] For example, the stator is protected against corrosion and thus rust by the coating. This is achieved, for example, by impregnation in a rust-proofing matrix and / or by painting with a rust-proofing matrix.

[0068] Furthermore, the coating can also provide electrical insulation. This is accomplished, for example, by fillers in the coating.

[0069] Ceramic fillers are advantageously used here to increase the wear resistance, preferably in the outer region. Ceramic fillers can also be used to increase the insulation capacity and thermal conductivity, especially in the region of the grooves of the winding.

[0070] Furthermore, suitable fillers are thermally conductive particles, for example quartz sand or particles that resist partial discharges, in particular particles based on silicon.

[0071] According to the invention, a conventional housing is dispensed with. By punching these jaw-like jaws and / or ribs into the individual laminations during the stamping process, previous housing functions (such as supports for support feet, flanges, etc.) are designed to be integrated into the stator.

[0072] The bearing cap advantageously has a receptacle for mounting the bearing of the shaft of the rotor. The housingless electric rotating machine advantageously has a bearing cap on the A side (the side facing the working machine) and a bearing cap on the B side (the side facing away from the working machine). The bearing cap can have axially aligned ribs and surface enlargement structures on the end faces to obtain further cooling.

[0073] The bearing shield advantageously has ribs which are axially aligned with the cooling ribs of the magnetic conductor of the stator.

[0074] The winding heads of the winding system of the stator are preferably positioned axially below the end elements so that their heat losses can be better dissipated. In this way, the efficiency of the caseless electric rotating machine can be increased.

[0075] In an advantageous embodiment, the connecting element fixing the mounting element to the jaws of the stator is a screw element. The screw element is preferably a tensioning screw, for example to tension or fix the support foot to the stator via the mounting element. The support takes place in particular on complementary surfaces, the clamp jaws and the additional element.

[0076] In an advantageous embodiment, the end element has a terminal box for supplying electrical energy.

[0077] The connection box advantageously has a connection box base and is designed for connection to the connection box.

[0078] The invention also offers the advantage that the recycling of the electric motor is simplified due to the absence of a housing. For example, if a winding is damaged, it can be removed from the stator laminated core and a new winding can be inserted. Thus, the stator laminated core and the components that can be attached thereto can be easily reused.

[0079] The invention also offers the advantage that no centering pieces need to be machined. The slot bottoms in the stator are used for this purpose. Due to the stamping of the individual laminations, the accuracy of the coaxiality and the final positioning of the rotor in the stator bore is very high.

[0080] Thus, machines with different power-related laminated core lengths within the shaft height can be designed as short as possible. The machine length, ie the length of the active part (laminated core of the stator with windings), is therefore not dependent on the housing.

[0081] The bearing caps are not mounted to a defined housing surface but directly to the laminated core of the stator.

[0082] The bearing caps arranged on both sides are preferably tightened with screws or rivets.

[0083] The invention enables the outer diameter of the stator to be increased compared to a similar electric motor having a housing. A larger stator outer diameter enables the rotor outer diameter to be also larger, thereby achieving higher performance or higher efficiency. Improved heat dissipation is thus also provided.

[0084] The invention is suitable for all fields of application of electric rotating machines, in particular for industrial applications such as pumps, fans, compressor drives and conveyor systems. Such machines can also be used in the food industry and in traffic engineering as traction drives or auxiliary drives. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] The invention and further advantageous embodiments of the invention will be explained in more detail with reference to the exemplary embodiments shown in principle. In the drawings:

[0086] Figure 1 shows a perspective view of a housingless electric rotating machine,

[0087] Figure 2 A partial view of the groove profile is shown.

[0088] Figure 3 shows a metal plate,

[0089] Figure 4 shows a perspective view of a laminated core,

[0090] Figure 5 A magnetic conductor is shown.

[0091] Figure 6 A perspective view showing the installation of the feet,

[0092] Figure 7 A cross-sectional view showing the foot installation,

[0093] Figure 8 A perspective view showing the installation of the feet,

[0094] Fig. 9 A diagram showing a mounting element in a groove,

[0095] Fig.10 A cross-sectional view of an electric rotating machine with a stator and a cover showing the stator with legs,

[0096] Fig.11 The bearing cap is shown,

[0097] Fig.12 A side view of an electric rotating machine is shown. DETAILED DESCRIPTION

[0098] It should be noted that concepts such as "axial", "radial", "tangential" etc. refer to the axis 6 used in the corresponding figures or the examples described in each case. In other words, the axial direction, the radial direction, the tangential direction always refer to the axis 6 of the rotor 3 and thus to the corresponding symmetry axes of the rotor 2. "Axial" describes a direction parallel to the axis 6, "radial" describes a direction orthogonal to the axis 6, in which direction it is directed towards the axis or also away from the axis, and "tangential" refers to a direction, which is directed circumferentially around the axis 6 at a constant radial distance from the axis 6 and at a constant axial position. The expression "in the circumferential direction" should be equivalent to "tangential".

[0099] With respect to a surface, for example a cross section, the terms “axial”, “radial”, “tangential” etc. describe the orientation of the normal vector of the surface, ie the vector perpendicular to the relevant surface.

[0100] The expression "coaxial components", for example a coaxial assembly such as a rotor 3 and a stator 2, is understood here to mean components having the same normal vector, whereby the planes defined by the coaxial components for the normal vector are parallel to each other. Furthermore, the expression shall include that the center points of the coaxial components lie on the same axis of rotation or axis of symmetry. However, these center points can alternatively lie on this axis, possibly at different axial positions, and whereby the distances of the mentioned planes to each other are >0. The expression does not necessarily require that the coaxial components have the same radius.

[0101] The concept "complementary" in the context of two components that "complement" each other, the outer shapes of the components being designed so that one component can preferably be completely arranged in a component that is complementary thereto, so that the inner surface of one component and the outer surface of the other component ideally contact seamlessly or over the entire surface. Thus, in the case of two objects that complement each other, the outer shape of one object is defined by the outer shape of the other object. The concept "complementary" can be replaced by the concept "opposite".

[0102] For reasons of clarity, in the case of multiple occurrences of components, some but not all of the components shown in the figures are generally provided with reference numerals.

[0103] The described embodiments can be combined arbitrarily. Similarly, individual features of the various embodiments can also be combined without departing from the essence of the invention.

[0104] Figure 1 A caseless electric rotating machine 1 is shown. The machine 1 comprises a stator 2, a rotor 3 and a shaft 4. The rotor 3 can be designed as a squirrel cage rotor or a permanent magnet rotor or a reluctance rotor. The stator 2 is made of a magnetically conductive body made of a sintered material (e.g. Figure 5 as shown) or by axially layered laminations (e.g. Figure 4 The heat dissipation ribs 9 are formed on the outer circumference of the stator 2 , in particular, on the outer circumference of the laminated core 8 .

[0105] The bearing cover 14 is arranged on an end face 17 of the stator 2 .

[0106] Figure 1 It is also shown that the bearing cover 14 also has cooling ribs. The bearing cover 14 also has at least a partial connection box or terminal box base 21 .

[0107] also, Figure 1 An additional element 12 is shown which is embodied as a supporting foot and whose installation is described in the other figures.

[0108] The machine 1 can be made more compact relative to the height of the shaft by increasing the outer diameter of the stator 2 and the rotor 3. In this case, the package size is no larger than a machine with a housing.

[0109] The present invention simplifies the recycling and disposal of engine components.

[0110] Figure 2 A partial view of the profile of the groove 16 is shown. The profile of the groove 16 has an opening 28 of the jaws 15 arranged like a pliers. A groove base 29 is located opposite the opening 28. The jaws form the groove structure 16 inwardly. The jaws 15 have a preferably flat section 18 outwardly, which is formed behind the complementary surface of the additional element 12.

[0111] Figure 3 The cross section of the magnetic conductor of the laminated core 8 of the stator 2 is shown. The laminated core 8 consists of axially layered laminations. Preferably, the individual laminations are bonded to each other over the entire surface. In the present embodiment, four groove structures 16 are provided, distributed on the outer circumference of the stator 2. This number and / or arrangement can vary depending on the embodiment of the stator 2.

[0112] The individual laminations of the laminated core 8 are designed in one piece and therefore have recesses for accommodating a winding system (not shown in greater detail) as well as cooling ribs 9 and a groove structure 16. The individual laminations are advantageously produced by stamping. The cooling is thus integrated into the stator 2. Thus, the heat transfer from the heat sources of the stator 2 (winding system, iron losses, eddy current losses, etc.) to the cooling ribs 9 during operation of the electric rotating machine 1 is optimal.

[0113] Figure 4 The laminated core 8 of the stator 2 is shown, which is composed of individual laminates, which correspond to the Figure 3 Axially continuous grooves 16 are visible.

[0114] Figure 5 The magnetically conductive one-piece body of the stator 2 is shown with axially continuous grooves 16 .

[0115] Figure 6 A partial perspective view is shown on the stator 2. The additional element 12 designed as a support foot is fixed by means of two screws 11 and by means of a mounting element 10 located in the groove 6. First, one or more mounting elements 19 are inserted axially into the desired groove 16 and the thread of the mounting element 10 is oriented, optionally by rotation.

[0116] The placement foot is then fixed in a predetermined axial position via two screws 11 . The groove 16 is then covered by a cover 31 , which can be part of the bearing cover 14 .

[0117] exist Figure 7 The fixing is shown in more detail in FIG. One or more, preferably paired, threaded threads are provided in the mounting element 10, via which the additional element 12 is fixed to the stator 2. These threaded threads in the mounting element 10 are continuous, i.e. without blind holes. Thus, it is possible for the screw 11 to pass through the mounting element 10 into the groove seat 29.

[0118] As a result, the fixing and the bracing of the additional element 12 on the section 18 of the jaw 15 and thus on the stator 2 are improved.

[0119] As in Fig. 9 As shown in , the mounting element 10 is preferably cylindrical in shape so as to be easily positioned axially and / or by rotation in the groove 16 formed by the jaws 15 .

[0120] As a result of the screwing-in process, the additional element 12 of its surface 19 pulls the section 18 towards the complementary counterpart of the jaw 15 .

[0121] In order to prevent the individual laminations from fanning out on the prismatic contour of the jaws 15, the individual laminations of the stator 2 are glued, stamped or welded to one another over the entire surface or in parts. In order to fix the laminations, in particular the laminations in the outer region of the jaws 15, a weld seam 30 is preferably provided over the entire axial length of the laminated core 8 of the stator 2. Laser welding is preferably used.

[0122] Figure 8 A perspective view of a detail of an additional element 12 designed as a supporting foot on the stator 2 is shown.

[0123] Fig.10 A cross section of a stator 2 with two supporting feet is shown. In order to fix possible further additional elements 12 , such as terminal boxes, converters, lifting eyes etc., the mounting element 10 is inserted into two further grooves 16 .

[0124] Fig.11 The bearing cover 14 is shown which can be attached to the end face 17 of the laminated core 8 of the stator 2. It has cooling ribs, a circumferential gap 32, a cover 31 via the groove 16 and a terminal box base 21.

[0125] The O-ring introduced into the gap 32 makes the sealing of the stator 2 and the bearing cover 14 particularly good. In this way, the machine 1 is particularly well protected from foreign bodies and contact and water. Therefore, the machine 1 has suitable protection classes IP54 and IP55. A foam seal can also be inserted into the gap 32.

[0126] Thus, embodiments of the machine 1 can be easily realized or also retrofitted with and without additional elements 12. Due to the existing precision of the punching process, no processing is required.

[0127] Fig.12 The machine 1 is shown with a cover 23. The machine 1 is preferably designed to be self-ventilating and advantageously has a fan (not shown). The cover 23 serves to shield the fan and guide the air.

[0128] The cover 23 is fixed to the stator 2 by means of a snap connection 20 .

Claims

1. A caseless electric rotating machine (1) comprising a stator (2) and a rotor (3), the rotor being mounted rotatably about an axis (6) and being separated from the stator (2) by an air gap (5), in, The stator (2) has a substantially hollow cylindrical magnetic conductor. The magnetic conductor has a plurality of jaws (15) arranged in a clamp-like manner and distributed on the outer circumference (52) of the magnetic conductor. The two jaws (15) arranged opposite to each other in a pliers-like manner are implemented as an axially extending groove structure (16), at least one mounting element (10) can be accommodated in the groove structure, and the mounting element can move axially and / or around its own axis in the groove structure (16), wherein the mounting element (10) can be connected to the additional element (12) by means of a connecting element (11), in particular a screw, so that a complementary contact area (13) is locally generated between an outer section (18) of the jaws (15) and a corresponding surface (19) of the additional element (12), and the mounting element causes a wedge effect on the complementary contact area (13).

2. The caseless electric rotating machine (1) according to claim 1, characterized in that: The mounting element (10) is designed to be arc-shaped, in particular circular, in its cross section and has a hole (26) or a plurality of holes (27) arranged in pairs.

3. The caseless electric rotating machine (1) according to claim 1 or 2, characterized in that: An end element, in particular a bearing cover (14), is arranged on at least one axial end (24, 25) of the stator (2), wherein the end element is mechanically connected to the stator (2) by means of at least one connecting element (11).

4. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that At least one mounting element (10) is arranged in at least one groove structure (16) of the stator (2).

5. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that There are one, two or three mounting elements (10) per groove (16).

6. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that The additional element (12) is embodied as a support foot, a converter bracket, a bracket for a terminal box or a bracket for a monitoring device.

7. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that The additional element (12) is embodied at least partially with ribs.

8. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that The magnetic conductor has cooling ribs (9) which are oriented radially or at least partially parallel on the outer circumference (22) of the stator 2.

9. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that The magnetic conductor is composed of laminations, and each lamination is designed as a single piece and has at least a groove (7) of a winding system and a jaw (15) arranged in a clamp-like manner, wherein the laminations form a laminated core (8) of the stator (2) in an axially layered manner, and the laminations implement an axially extending groove structure (16) at least on the laminated core (8).

10. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that The end element is designed as a bearing cover (14) and axially covers at least partially an axially extending groove (16).

11. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that At least one end element (14) has at least a part of a terminal box (21) for supplying electrical energy to the electric rotating machine (1).

12. A caseless electric rotating machine (1) according to any one of the preceding claims, characterised in that The stator (2) is at least partially covered with a coating, in particular a metallic coating.

13. Use of a housingless electric rotating machine (1) according to any of the preceding claims as a drive for a compactor, pump, compressor or fan in an industrial environment, in the food industry or in traction applications.

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