Housing-free dynamoelectric rotary machine having add-on elements

Abstract

The invention relates to a housing-free dynamoelectric rotary machine (1), having a stator (2) and a rotor (3) which is mounted so as to be rotatable about an axis (6) and which is spaced apart from the stator (2) by an air gap (5), wherein the stator (2) has a substantially hollow-cylindrical magnetically conductive body, wherein the magnetically conductive body has, distributed on its outer circumference (52), a plurality of jaws (15) arranged in the form of tongs, wherein two jaws (15) arranged opposite one another in the form of tongs form an axially extending channel structure (16) in which there can be received at least one fastening element (10) which is movable axially and / or about its own axis in the channel structure (16), wherein the fastening element (10) can be connected to an add-on element (12) by means of connecting elements (11), in particular a screw, in such a way that there result partially complementary bearing regions (13) of outer portions (18) of the jaws (15) and a corresponding surface (19) of the add-on elements (12), producing a wedging action at the complementary bearing region (13).

Description

[0001] Description

[0002] Frameless dynamoelectric rotary machine with attachments

[0003] The invention relates to a housingless dynamoelectric rotary machine with one or more attachments.

[0004] Dynamoelectric rotary machines, especially motors in industrial applications, are typically designed with a housing. Housings made of aluminum or gray cast iron are particularly popular. The housing is press-fitted onto a stator, either hot or cold.

[0005] The functions of this housing include, among other things, cooling the dynamo-electric machine, in particular the stator, and providing connection options such as flanges, feet, etc.

[0006] A large proportion of industrial motors (approximately 50%) are foot-mounted. These feet are generally welded, cast, or screwed to the housing.

[0007] A damaged casing is often a reason to dispose of the entire dynamoelectric machine, as repair can sometimes be difficult.

[0008] Furthermore, a housing limits the cooling efficiency of a dynamoelectric machine.

[0009] There are therefore also frameless dynamoelectric machines.

[0010] For example, DE 20 37 769 A1 discloses a surface-cooled, frameless electric motor with bearing shields that are supported on the stator core consisting of rectangular sheets, the stator cores having teeth partially or entirely on their outer circumference that are shaped so that they can be punched from strip material without a grid. DE 78 13 179 U1 discloses a frameless electrical machine, preferably an electric motor, with a rotor and with a laminated stator core, on both ends of which bearing shields are arranged, wherein on the circumference of the stator core there is provided at least one dovetail guide that extends parallel to the longitudinal axis of the rotor shaft of the electrical machine and is formed by the stator core, which dovetail guide guides and supports at least one member of the electrical machine in a straight manner in a form-fitting manner, which member is secured against axial displacement in its operating position.

[0011] US 2006 / 284511 A1 discloses a motor comprising a stator core formed from a plurality of stator laminations, which at least partially defines a circumferential surface of the motor. Each stator section has a plurality of ribs extending radially outward. When assembled, the ribs of adjacent laminations combine to form larger ribs extending the length of the stator core. These laminations improve motor cooling by enhancing heat dissipation from the motor.

[0012] From EP 3 944 465 A1 a housing-less dynamoelectric rotary machine with a stator is known, wherein 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 a row along an axis of rotation, wherein the material layer structure has a plurality of thickened portions and a plurality of slots, wherein a slot is arranged between two thickened portions, wherein at least one slot is designed such that at least one slot wedge can be received, wherein at least one thickened portion is designed such that the slot wedge can be fixed, wherein an end element is arranged on at least one axial end of the stator, wherein the end element is connected to the stator by means of at least one connecting element, wherein at least one slot wedge is arranged in at least one slot of the stator, wherein the connecting element is connected to at least one slot wedge.

[0013] The disadvantage of these known motors is that they are relatively expensive to manufacture and have inadequate vibration characteristics during operation of the dynamo-electric rotary machine.

[0014] Based on this, the object of the invention is to create a dynamoelectric rotary machine which, with a comparatively simple structure, has a high degree of compactness, high cooling efficiency, low vibration behaviour and is also suitable for a wide variety of applications.

[0015] The object is achieved by a housing-less dynamoelectric rotary machine, with a stator and a rotor which is mounted so as to be rotatable about an axis and which is spaced from the stator by an air gap, wherein the stator has a substantially hollow cylindrical magnetically conductive body, wherein the magnetically conductive body has a plurality of jaws arranged in a pincer-like manner distributed over its outer circumference, wherein two jaws arranged opposite one another in a pincer-like manner form an axially extending groove structure into which at least one fastening element can be received, which is movable axially and / or about its own axis in the groove structure, wherein the fastening element can be connected to an attachment element by means of connecting elements, in particular a screw, in such a way that sectionally complementary contact areas of outer sections of the jaws and corresponding surfaces of the attachment elements result,which cause a wedge effect on the complementary contact area. According to the invention, on the outer diameter of the stator,

[0016] - regardless of whether it is a one-piece magnetically conductive body or a laminated core - channel structures or prismatic geometries are created. These geometries can also be referred to as prismatic corresponding geometries or, at least in sections, prismatic corresponding geometries. Their contact areas are thus, at least in sections, complementary to the corresponding surfaces of the attachment elements.

[0017] In the case of individual sheets, additional prismatic geometries are punched during the manufacturing process (punching) of the laminated core, which ultimately result in a prismatic holder for add-on elements, such as feet, flanges, etc., at least in axial sections on the stacked laminated core of the stator.

[0018] According to this contour, the add-on elements are equipped with a matching - i.e. complementary - geometry for fixing.

[0019] The prismatic receptacles of the stator, formed by the opposing jaws, contain axially extending pockets, or grooves, into which fastening elements are inserted. These fastening elements can be moved axially and / or around their own axis within the groove, facilitating the insertion and alignment of the fastening elements.

[0020] According to the invention, the fastening elements are rounded in their cross-section, in particular circular, and have one thread or several threads, in particular aligned in pairs.

[0021] This makes it easy to equip each fastening element with one or two, or in pairs, other fastening options, allowing a wide variety of support feet or other attachments to be attached, particularly by screwing them on. When the attachments are screwed on, an increasingly strong holding effect is created between the jaws and the attachments.

[0022] The fastening element causes the jaws to expand, which leads to a healing effect, i.e. a tensioning of the complementary surfaces - i.e. the pliers-shaped jaws and the attachment elements.

[0023] This bracing reduces unwanted micro-movements on the attachment elements, in particular the foot attachment, which arise from electromagnetic or mechanical imbalances of the frameless dynamoelectric rotary machine.

[0024] The elimination of a mechanical interface (housing - stator) also has a positive effect on the susceptibility to vibration of the entire system, i.e. the entire dynamoelectric rotary machine.

[0025] The rigidity of this fastening system is therefore higher than, for example, that of a comparatively well-known foot fastening on a housing of a dynamo-electric rotary machine.

[0026] Preferably, the strength values ​​of the materials of this fastening system are selected so that the deformation due to the tensioning of the components involved, such as add-on elements and fastening elements, is in the elastic range.

[0027] This also makes it possible to reassemble the add-on elements after disassembly.

[0028] The fastening according to the invention provides the add-on elements with an adjustable preload, which provides additional security against loosening of the add-on elements on the stator. The fastening of the add-on elements according to the invention is thus extremely secure in both the radial and axial directions.

[0029] Sharp edges on the front face, especially on the axially and / or radially outer sheets or sheet sections, are covered by covers integrated into the bearing shield. This reduces the risk of injury from the sharp edges of the outer sheets. It also prevents paint chipping (after painting) at these edges.

[0030] With the fastening method according to the invention, attachments are fixed directly to the stator, i.e., without a housing interface, with a self-reinforcing holding effect. This allows for mounting feet or flanges with significantly greater rigidity than mounting feet or flanges on a housing. The mounting natural frequency is higher, enabling reliable operation over a wide frequency range and thus also for increased speeds of a dynamoelectric rotating machine.

[0031] The critical oscillation movements, rocking sideways and lengthwise, are reduced.

[0032] The function of fastening various add-on elements is integrated into the stator, which creates the possibility of achieving technically improved fixation in a housing-less dynamoelectric rotary machine despite saving on the housing.

[0033] With a laminated stator, the high manufacturing precision of the stamping technology makes it possible to forgo surface machining on the add-on elements of the entire dynamo-electric rotary machine. These surfaces can therefore be created during machining, for example, on the individual base. The permissible tolerance in a motor axis height (base surface to motor axis) can be maintained through the base and assembly tolerance. Up to and including an axis height of 250 mm, this is a tolerance of max. 0.5 mm, and from an axis height of 25 mm, the permissible tolerance is max. 1 mm.

[0034] In the case of a flange motor (i.e. a dynamoelectric rotary machine without feet), the prismatic geometries serve as cooling fins.

[0035] Painting the inside of the jaws, i.e., the grooves, is easily possible. The tolerance in the paint layer thickness can be compensated for by the fastening element, since its radial position functions without problems within a tolerance range of approximately 500 μm.

[0036] In one embodiment, an end element, in particular a bearing plate, 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.

[0037] Thus, the channel structure is closed axially, whereby the end elements create a packaging of the stator and a fixation of the bearing shields.

[0038] In one embodiment, at least one fastening element is arranged in at least one groove structure of the stator.

[0039] Several fastening elements in a channel structure allow for a wide variety of mounting options for the frameless dynamoelectric rotary machine, for example, to a foundation. The vibration characteristics of the frameless dynamoelectric rotary machine can be influenced by the choice of feet and / or positioning.

[0040] In a design in which one, two or three fastening elements are present per trough, not only feet but also other add-on elements such as converter holders, holders for a terminal box, terminal box bases, holders for a monitoring device or transport eyes etc. can be attached. In order to further improve the cooling of the frameless dynamoelectric rotary machine, the magnetically conductive body has cooling fins which are aligned essentially radially or at least partially parallel on the outer circumference of the stator.

[0041] A further cooling effect is achieved by providing the attachment elements with ribs, at least in sections. By clamping the complementary surfaces—that is, the pincer-shaped jaws—with the attachment elements, heat can be transferred from the laminated core to the attachment elements.

[0042] In order to further reduce the eddy currents during operation of the frameless dynamoelectric rotary machine, the magnetically conductive body is constructed from sheets, each sheet being made in one piece and having at least grooves of a winding system and jaws arranged in a tong-like manner, these sheets being axially layered to form a laminated core of the stator with one or more groove structures.

[0043] These preferably punched sheets are bonded to one another, in particular glued and / or welded at sections or axially fixed by tie rods.

[0044] The individual laminations are advantageously packaged together to form a stator iron core during or after the punching process. This is particularly successful when the individual laminations are fully bonded.

[0045] Full-surface bonding also offers the advantage of sealing the individual sheets. This provides good protection against contact, foreign matter, and water.

[0046] If the end element of the frameless dynamoelectric rotary machine is designed as a bearing shield and at least partially covers the axially extending grooves, the positioning of the fastening elements is facilitated.

[0047] In a further embodiment, at least one end element comprises at least parts of a terminal box, which serves to supply the dynamoelectric rotary machine with electrical energy. This reduces the variety of parts in a dynamoelectric rotary machine.

[0048] The cooling fins of the stator and the cooling fins of the end element are advantageously arranged axially in alignment.

[0049] The stator, in particular the laminated core of the stator, is covered with a coating, at least in sections, in particular on its outer surface, in order to provide protection against contact, corrosion, foreign bodies and water.

[0050] In an advantageous design, the stator is coated to provide a dense, smooth, and thus easy-to-clean surface. This is particularly important in the medical field or in the food industry.

[0051] Furthermore, the coating is not only suitable on the surface to form an insulating layer between the winding and the stator lamination in an inner area of ​​the slots.

[0052] A metallic coating is also possible on the outer circumference. Possible options include galvanic coating, thermal flame spraying or cold gas spraying, and dipping (e.g., galvanizing).

[0053] Preferably, only one type of coating is used, one that is suitable for both the external and internal areas of the stator. A resin-based coating, applied, for example, by painting or dipping, is particularly suitable for this purpose. Electrostatic powder coating (e.g., with subsequent thermal treatment) is another option.

[0054] The metallic coating advantageously has a thickness between 20 and 70 pm, particularly between 30 and 60 pm. A plastic coating has values ​​between 60 and 500 pm.

[0055] A coating containing lacquer and / or resin is also conceivable. These can be polyester (unsaturated) and / or epoxy-based. Silicones are also conceivable.

[0056] The coating protects the stator against corrosion and thus rust formation. This can be achieved, for example, by dipping it in a rust-protection substrate and / or by painting it with the rust-protection substrate.

[0057] Furthermore, electrical insulation can be created through the coating. This is achieved, for example, by adding fillers to the coating.

[0058] Ceramic fillers are advantageously used to improve abrasion resistance, preferably in outdoor areas. Ceramic fillers can also be used to increase insulation and thermal conductivity, particularly in the winding groove area.

[0059] Thermally conductive particles, e.g. quartz sand, or partial discharge-resistant particles, especially silicon-based, are also suitable as fillers.

[0060] According to the invention, a conventional housing is dispensed with. Previous housing functions, such as holders for feet, flanges, etc. are integrated into the stator by punching these pincer-shaped jaws and / or ribs into the respective individual sheets during the punching process. The bearing shield advantageously has a receptacle for a bearing for supporting a shaft of the rotor. The housing-less dynamoelectric rotary machine advantageously has a bearing shield on an A-side (side facing a driven machine) and a bearing shield on a B-side (side facing away from a driven machine). The bearing shield can have axially aligned ribs, as well as surface-enlarging structures on the end faces in order to achieve additional cooling.

[0061] Advantageously, the bearing shield has ribs that are axially aligned with the cooling ribs of the magnetically conductive body of the stator.

[0062] The winding heads of a stator winding system, which are preferably positioned axially beneath the end element, can thus dissipate their heat losses more effectively. This can increase the efficiency of the frameless dynamoelectric rotary machine.

[0063] In an advantageous embodiment, the connecting element that secures the fastening elements to the jaws of the stator is a screw element. The screw element is preferably a clamping screw, for example, to clamp or fix a base to the stator via the fastening element. The clamping takes place in particular on the complementary surfaces, the jaws arranged in a pincer-like manner, and the attachment elements.

[0064] In an advantageous embodiment, the end element has a terminal box for supplying electrical energy.

[0065] The terminal box advantageously has a terminal box base and is designed for connection to a terminal box.

[0066] The invention also offers the advantage of simplifying recycling of the dynamoelectric machine, since there is no housing. For example, if a winding becomes damaged, it can be removed from the stator's laminated core and a new winding inserted. This makes it easy to reuse the stator's laminated core and the components mounted there.

[0067] The invention also offers the advantage that machining of centering elements is not necessary. The groove base in the stator is used for this purpose. The accuracy of coaxiality, and thus ultimately the positioning of a rotor in a stator bore, is very high thanks to the punching of the individual laminations.

[0068] The machine, with different, power-related lengths of the laminated cores within one shaft height, can thus be designed as short as possible. The machine length, i.e. the length of the active part (laminated core of the stator with winding), is therefore not dependent on a housing.

[0069] The bearing shield is not attached to an explicit housing surface, but directly to the stator's laminated core.

[0070] The bearing shields provided on both sides are preferably clamped with screws or rivets.

[0071] The invention makes it possible to increase the outer diameter of the stator compared to comparable dynamoelectric machines with a housing. A larger stator outer diameter also makes it possible to make the rotor outer diameter larger, thus achieving higher performance and higher efficiency. This also provides improved heat dissipation.

[0072] The invention is suitable for all applications of dynamoelectric rotary machines, particularly for industrial applications such as pump, fan, and compressor drives, as well as for conveyor systems. Such machines can also be used in the food industry, as well as in applications in transportation engineering as traction drives or auxiliary drives.

[0073] The invention and further advantageous embodiments of the invention are explained in more detail using exemplary embodiments shown in principle, in which:

[0074] FIG 1 shows a perspective view of a housingless dynamoelectric rotary machine,

[0075] FIG 2 a partial section of a contour of a gutter,

[0076] FIG 3 a sheet,

[0077] FIG 4 a laminated core in perspective view,

[0078] FIG 5 a magnetically conductive body,

[0079] FIG 6 a perspective view of a fastening of a foot,

[0080] FIG 7 a section through a fastening of a foot,

[0081] FIG 8 is a perspective view of a foot attachment,

[0082] FIG 9 shows a representation of a fastening element in a channel,

[0083] FIG 10 a cross section of a stator with feet, the dynamoelectric rotary machine with a hood,

[0084] FIG 11 a bearing shield,

[0085] FIG 12 a side view of a dynamoelectric rotary machine .

[0086] It should be noted that terms such as “axial”, “radial”, “tangential” etc. refer to the axis 6 used in the respective figure or in the respective example described. In other words, the directions axial, radial and tangential always refer to an axis 6 of a rotor 3 and thus to the corresponding axis of symmetry of the stator 2. “Axial” describes a direction parallel to the axis 6, “radial” describes a direction orthogonal to the axis 6, towards it or away from it, and “tangential” is a direction which is at a constant radial distance from the axis 6 and, at a constant axial position, is directed in a circle around the axis 6. The expression “in the circumferential direction” is to be equated with “tangential”.

[0087] With reference to a surface, e.g. a cross-sectional area, the terms "axial", "radial", "tangential" etc. describe the orientation of the normal vector of the surface, i.e. the vector that is perpendicular to the surface in question.

[0088] The term "coaxial components," e.g., coaxial components such as rotor 3 and stator 2, refers to components that have the same normal vectors, i.e., for which the planes defined by the coaxial components are parallel to each other. Furthermore, the term should imply that the centers of coaxial components lie on the same rotation or symmetry axis. However, these centers may be located at different axial positions on this axis, and the planes mentioned may therefore have a distance >0 from each other. The term does not necessarily require that coaxial components have the same radius.

[0089] The term "complementary," in the context of two components that are "complementary" to each other, means that their external shapes are designed such that one component can preferably be arranged completely within its complementary component, so that the inner surface of one component and the outer surface of the other component ideally touch each other seamlessly or over their entire surface. Consequently, in the case of two mutually complementary objects, the external shape of one object is determined by the external shape of the other object. The term "complementary" could be replaced by the term "inverse."

[0090] For the sake of clarity, in some cases where components are present multiple times, not all of the components shown are provided with reference symbols. The described embodiments can be combined as desired. Likewise, individual features of the respective embodiments can be combined without departing from the essence of the invention.

[0091] FIG 1 shows a frameless dynamoelectric rotary machine 1. This 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 as a reluctance rotor. The stator 2 is constructed from a magnetically conductive body made of sintered material (as shown, for example, in FIG 5) or from axially layered sheets (as shown, for example, in FIG 4). Cooling fins 9 are formed on an outer circumference of the stator 2, in particular on an outer circumference of the laminated core 8.

[0092] End shields 14 are arranged on the end faces 17 of the stator 2.

[0093] FIG. 1 further shows that the bearing plate 14 also has cooling fins. The bearing plate 14 also has at least parts of a terminal box or terminal box base 21.

[0094] Furthermore, FIG 1 shows add-on elements 12 which are designed as feet and whose fastening is described in the other figures.

[0095] By increasing the outer diameters of the stator 2 and rotor 3, it is possible to make the machine 1 more compact in terms of performance relative to the shaft height. The envelope dimensions are no larger than those of a machine with a housing.

[0096] Recycling and processing of engine components are simplified by this invention.

[0097] FIG. 2 shows a partial section of the contour of a groove 16. The contour of the groove 16 has an opening 28 of jaws 15 arranged in a pincer-like manner. Opposite the opening 28 is a groove base 29. The jaws form a groove structure 16 on the inside. On the outside, the jaws 15 have a preferably flat section 18, which is designed according to complementary surfaces of the attachment elements 12.

[0098] FIG. 3 shows a cross-section of the magnetically conductive body of the laminated core 8 of the stator 2. The laminated core 8 is constructed from axially layered sheets. These individual sheets are preferably bonded together over their entire surface. Distributed around the outer circumference of the stator 2, four groove structures 16 are provided in this embodiment. The number and / or their arrangement can vary depending on the design of the stator 2.

[0099] The individual laminations of the laminated core 8 are constructed in one piece and thus have grooves for accommodating a winding system (not shown in detail), as well as cooling fins 9 and the channel structures 16. The individual laminations are advantageously produced by stamping. Cooling is thus integrated in the stator 2. Heat transfer from the heat sources of a stator 2 (winding system, iron losses, eddy current losses, etc.) during operation of a dynamoelectric rotary machine 1 to the cooling fins 9 is thus optimal.

[0100] FIG. 4 shows a laminated core 8 of the stator 2, which is constructed from individual sheets whose cross-section corresponds to FIG. 3. The axially continuous grooves 16 are visible.

[0101] FIG 5 shows a magnetically conductive, one-piece body of the stator 2 with its axially continuous grooves 16 .

[0102] FIG 6 shows a perspective partial section of the stator 2. In this case, an attachment element 12 in the form of a base is fixed by two screws 11 and by means of a fastening element 10 located within the groove 6. In this case, one or more fastening elements 19 are first inserted axially into the required groove 16 and the thread of the fastening element 10 is aligned, if necessary by rotation. The base is then fixed in the intended axial position using the two screws 11. The groove 16 is then covered by the cover 31, which can be part of the bearing plate 14.

[0103] The fixation is shown in more detail in FIG. 7. The fastening element 10 is provided with one or more threads, preferably aligned in pairs, by means of which the attachment elements 12 are fixed to the stator 2. These threads in the fastening elements 10 are continuous, i.e., they are not blind holes. This allows screws 11 to penetrate through the fastening elements 10 into the groove base 29.

[0104] This improves the fixing and clamping of the attachment elements 12 to the sections 18 of the jaws 15 and thus to the stator 2.

[0105] The fastening elements 10 are - as shown in FIG 9 - preferably cylindrically shaped in order to be easily positioned axially and / or by rotation in the groove 16 formed by the jaws 15.

[0106] During the screwing-in process, the attachment element 12 with its surface 19 is pulled onto the complementarily formed counterpart of the jaws 15, the sections 18.

[0107] To prevent the individual laminations from fanning out along the prismatic contour of the jaws 15, the individual laminations of the stator 2 are fully or partially bonded, punched, or welded together. To secure these laminations, particularly in the outer regions of the jaws 15, a weld seam 30 is preferably provided over the entire axial length of the lamination stack 8 of the stator 2. Laser welding is preferably used.

[0108] FIG. 8 shows a perspective partial view of an attachment element 12 designed as a base on the stator 2. FIG. 10 shows a cross-section of the stator 2 with two bases. Fastening elements 10 are inserted into the other two grooves 16 in order to secure additional attachment elements 12, such as terminal boxes, converters, lifting eyes, etc.

[0109] FIG. 11 shows a bearing plate 14 that can be attached to an end face 17 of the laminated core 8 of the stator 2. It has cooling fins, a circumferential gap 32, a cover 31 over the grooves 16, and a terminal box base 21.

[0110] Sealing the stator 2 and bearing plate 14 is particularly effective using an O-ring inserted into a gap 32. This provides the machine 1 with particularly good protection against foreign bodies, contact, and water. The machine 1 is thus suitable for protection classes IP54 and IP55. A foamed seal can also be inserted into the gap 32.

[0111] Thus, a machine 1 with or without add-on elements 12 can be easily implemented, or even retrofitted. The required machining is not necessary due to the existing precision of the punching process.

[0112] FIG. 12 shows the machine 1 with a hood 23. The machine 1 is preferably self-ventilated and advantageously has a fan (not shown). The hood 23 serves to shield this fan and to guide the air.

[0113] This cover 23 is fixed to the stator 2 by means of a snap connection 20.

Claims

Patent claims 1. A housing-free dynamoelectric rotary machine (1) comprising a stator (2) and a rotor (3) which is mounted so as to be rotatable about an axis (6) and which is spaced from the stator (2) by an air gap (5), wherein the stator (2) comprises a substantially hollow-cylindrical, magnetically conductive body, wherein the magnetically conductive body comprises, distributed over its outer circumference (52), a plurality of jaws (15) arranged in a pincer-like manner, wherein two jaws (15) arranged opposite one another in a pincer-like manner form an axially extending groove structure (16) into which at least one fastening element (10) can be received, which fastening element (10) can be moved axially and / or about its own axis in the groove structure (16), wherein the fastening element (10) can be connected to an attachment element (12) by means of connecting elements (11), in particular a screw, in such a way thatthat in sections complementary contact areas (13) of outer sections (18) of the jaws (15) and corresponding surfaces (19) of the attachment elements (12) result, which cause a wedge effect on the complementary contact area (13).

2. Housing-less dynamoelectric rotary machine (1) according to claim 1, characterized in that the fastening elements (10) are rounded, in particular circular, in their cross-section and have a bore (26) or a plurality of bores (27) arranged in pairs.

3. Housing-less dynamoelectric rotary machine (1) according to claim 1 or 2, characterized in that an end element, in particular a bearing plate (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. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that at least one fastening element (10) is arranged in at least one groove structure (16) of the stator (2).

5. A housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that one, two or three fastening elements (10) are present per groove (16).

6. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that the attachment element (12) is designed as a base, converter holder, holder for a terminal box or as a holder for a monitoring device.

7. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that the attachment element (12) is ribbed at least in sections.

8. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that the magnetically conductive body has cooling fins (9) which are aligned radially or at least partially parallel on the outer circumference (22) of the stator 2.

9. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that the magnetically conductive body is constructed from sheets, and each sheet is made in one piece and has at least grooves (7) of a winding system and jaws (15) arranged in a tong-like manner, wherein these sheets, in an axially layered manner, form a laminated core (8) of the stator (2) and form an axially extending groove structure (16) at least on the laminated core (8).

10. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that the end element is designed as a bearing plate (14) and at least partially covers the axially extending grooves (16).

11. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that at least one end element (14) has at least parts of a terminal box (21) which serves to supply the dynamoelectric rotary machine (1) with electrical energy.

12. Housing-less dynamoelectric rotary machine (1) according to one of the preceding claims, characterized in that the stator (2) is covered at least in sections with a coating, in particular a metallic coating.

13. Use of a housing-less dynamoelectric rotary machine (1) according to one of the preceding claims as a drive for compressors, pumps, compressors or fans in an industrial environment, in the food industry or in traction applications.

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