Housingless motor and method for producing same

Abstract

The invention relates to a dynamo-electric rotating machine (1), in particular a housingless dynamo-electric machine, comprising a magnetically conductive hollow cylindrical body, in particular a laminated core (25) made of axially layered plates, as a stator (2), wherein slots (5) in which a winding system (21) is arranged face the inner lateral surface (18) of the hollow cylindrical body, said winding system forming winding heads (I, II) on the end faces (III, IV) of the hollow cylindrical body, i.e. the stator (2), wherein the winding heads (I, II) are at least partly surrounded by toroidal bearing shields (8, 26) which are open on one side, and the bearing shields (8) are terminated by the end faces (III, IV) of the hollow cylindrical body at least in the radially outer region of the hollow cylindrical body.

Description

[0001] Description

[0002] Frameless motor and method for its manufacture

[0003] The invention relates to a frameless dynamoelectric machine and a method for its manufacture as well as the use of such a dynamoelectric machine.

[0004] Dynamoelectric machines, such as electric motors, are manufactured, among other things, using wound round enameled wires, which are then wound into the stator's laminated core. The subsequent processes are often performed manually or semi-manually. These include forming the winding head, taping the winding head, and applying the phase insulation. In the application area of ​​low-voltage motors (up to 1 kV), the wire enamel corresponds to the main insulation.

[0005] For further mechanical strengthening and passivation against external influences, impregnation is usually carried out. This is a complex process in terms of manufacturing technology and process requirements, during which liquid reactive resin (e.g., epoxy or polyester) is introduced into the stator's laminated core (primarily by dipping, but also dip-rolling or trickling). The impregnation process in particular, which often takes the form of dip impregnation followed by hot-air oven curing, is a major cost factor in production in terms of investment costs, maintenance, cycle times, production space requirements, etc.

[0006] The reactive resin is then gelled over time and temperature and finally cured, which is usually done by hot air, current flow to the winding, infrared or ultraviolet radiation or induction.

[0007] In conventional manufacturing plants for dynamoelectric machines, many different motor variants are collected in a buffer zone and then impregnated in batches in an impregnation plant.

[0008] During final assembly of the motors, a fan is mounted on the shaft to ensure that the motor cools down.

[0009] An aluminum housing, with cooling fins to facilitate heat transfer to the convective air, is finally shrunk onto the stator's laminated core. The heat transfer from the stator to the housing is insufficient.

[0010] One possibility to replace the impregnation of the entire motor is to use so-called self-bonding wire as the copper winding, i.e. a special wire enamel which has partially cross-linked duromers (prepregs) as outer layers, which melt and bake (chemically cross-link, harden) under temperature.

[0011] The disadvantage is that the increased layer thickness of the wire enamel reduces the copper fill factor in the groove and thus the efficiency of the motor during operation.

[0012] Based on this, the object of the invention is to provide a dynamoelectric machine which avoids the disadvantages mentioned above.

[0013] The stated object is achieved by a method for producing a stator of a dynamoelectric rotary machine, in particular a housing-less dynamoelectric machine, with a magnetically conductive hollow cylindrical body, in particular a laminated core made of axially layered sheets, wherein grooves point to an inner circumferential surface of the hollow cylindrical body, in which grooves a winding system is arranged, which forms winding heads on the end faces of the hollow cylindrical body, wherein the winding heads are at least partially surrounded by toroidal bearing shields or adapter bearing shields which are open on one side, wherein the bearing shields terminate with the end faces of the hollow cylindrical body at least in the radially outer region of the hollow cylindrical body, by the following steps:

[0014] - producing a magnetically conductive hollow cylindrical body, in particular a laminated core of axially layered sheets, wherein grooves point towards an inner surface of the hollow cylindrical body and surface-enlarging structures are formed on the outer surface of the hollow cylindrical body or are smooth,

[0015] - Positioning a winding system in the slots so that winding heads are formed on the end faces of the hollow cylindrical body,

[0016] - Pressing of half-open torus-shaped bearing shields onto the winding heads on the front sides of the hollow cylindrical body, and inserting the rotor,

[0017] - introducing liquid impregnating resin into at least one receiving space of a winding head of the stator, in particular via a terminal box base, wherein the dynamoelectric rotary machine is held on the shaft of the rotor and by tilting the axis and / or rotary and / or wobbling movements causes the distribution of the impregnating resin in the groove and the DE and NDE side bearing shield,

[0018] - whereby a predetermined rotation speed due to the centrifugal force prevents resin from flowing radially inwards into the air gap, but nevertheless creates sufficient wetting of the winding system so that the inner surface remains free of impregnating resin.

[0019] The stated object is also achieved by a method for producing a stator of a dynamoelectric rotary machine, in particular a housing-less dynamoelectric machine, with a magnetically conductive hollow cylindrical body, in particular a laminated core made of axially layered sheets, wherein grooves point to an inner circumferential surface of the hollow cylindrical body, in which grooves a winding system is arranged, which forms winding heads on the end faces of the hollow cylindrical body, wherein the winding heads are at least partially surrounded by toroidal bearing shields or adapter bearing shields which are open on one side, wherein the bearing shields terminate at least in the radially outer region of the hollow cylindrical body with the end faces of the hollow cylindrical body, by the following steps:

[0020] - producing a magnetically conductive hollow cylindrical body, in particular a laminated core of axially layered sheets, wherein grooves point towards an inner surface of the hollow cylindrical body and surface-enlarging structures are formed on the outer surface of the hollow cylindrical body or are smooth,

[0021] - Positioning a winding system in the slots so that winding heads are formed on the end faces of the hollow cylindrical body,

[0022] - Pressing of half-open torus-shaped bearing shields or adapter bearing shields onto the winding heads on the end faces of the hollow cylindrical body,

[0023] - Introducing liquid impregnating resin into at least one receiving space of a winding head of the stator, in particular via an axial opening in the adapter bearing plate, wherein the stator of the dynamoelectric rotary machine is held on the outer circumference and by tilting the axis and / or rotating and / or wobbling movements causes the distribution of the impregnating resin in the groove and the DE and NDE side bearing plate

[0024] - whereby a predetermined rotation speed due to the centrifugal force prevents resin from flowing radially inwards into the air gap, but nevertheless creates sufficient wetting of the winding system so that the inner surface remains free of impregnating resin.The stated object is also achieved by a dynamoelectric rotary machine, in particular a housing-less dynamoelectric machine, with a magnetically conductive hollow cylindrical body, in particular a laminated core made of axially layered sheets, as the stator, wherein slots point to an inner circumferential surface of the hollow cylindrical body, in which slots a winding system is arranged which forms winding heads on the end faces of the hollow cylindrical body, i.e. the stator, wherein the winding heads are at least partially surrounded by toroidal bearing shields which are open on one side, wherein the bearing shields terminate at least in the radially outer region of the hollow cylindrical body with the end faces of the hollow cylindrical body, wherein the inner circumferential surface is free of impregnating resin.

[0025] According to the invention, special bearing shields or adapter bearing shields are provided for a stator, which are pressed onto the not yet bandaged and formed winding head of the winding system inserted into the slots of the stator.

[0026] Because the end shield facing the stator is a torus shape with half an opening, the winding head is automatically compacted and mechanically secured in this shape during axial application of the end shield. The end shield then forms a positive fit on the radial inside and, above all, outside of the respective end face of the stator's laminated core, creating a sealed (casting) mold. At least one of the winding head receiving spaces has an impregnation opening and thus a supply option, for example, via a terminal box or an adapter end shield.

[0027] This can preferably be achieved on just one side through a terminal box base opening. The winding or winding head generally rests—at least in sections—on the inner wall of the bearing plate, allowing the adjacent potting compound to be optimally distributed on and within the winding head and spread via capillaries into the stator slot and to the other winding head on the other end face.

[0028] In one version of the housingless motor, cooling fins are provided on the outer surface of the stator's laminated core, thus integrating the housing function and its cooling into the stator's laminated core. Surface-enlarging structures are provided on the outer surface of the hollow cylindrical body—the stator's laminated core. These structures can, for example, be stamped into the laminations.

[0029] This invention therefore also applies to motors that no longer need to be disassembled. If this inventive technology is to be used with larger and comparatively more expensive stators (i.e., disassembling the motors), the inner end shields, at least in the area of ​​the winding heads, must be provided with a hydrophobic coating (e.g., PTFE or a silicon-based release agent).

[0030] This would allow the motor to be disassembled afterward, as the impregnating resin does not chemically bond with the bearing shield, thus allowing demolding. The internal coating of the bearing shields is a cost factor that must be weighed against the possibility of a service inspection.

[0031] The bearing shield or adapter bearing shield is made of a plastic, e.g., a thermoplastic, in accordance with electrical insulation requirements. Special additives, such as glass fibers or ceramic fibers, are advantageous for improving the mechanical properties of the plastic and increasing its thermal conductivity (0.5-2.5 W / mK) (pure plastic 0.2-0.3 W / mK).

[0032] Other additives that purely increase thermal conductivity, such as quartz powder, fused silica, boron nitride, and Al2O3, can be useful in addition to or on their own, provided the mechanical properties are sufficient. Mechanical strength is required at least to the extent that fastening screw threads or insert nuts can be inserted into designated areas and must be sufficiently stable for mounting on the stator's laminated core.

[0033] The bearing shield as a cast part made of a filled duromer is also technically sensible, but may be more expensive than injection molding.

[0034] Manufacturing the bearing plate or adapter bearing plate from ceramic is also technically feasible, e.g., using the so-called CIM process (ceramic injection molding), whereby a ceramic paste with a low binder content is pressed into the torus mold, which is open on one side, and the binder is then burned out. Volume shrinkage, final geometry, and properties of the end product can be easily adjusted. The achievable thermal conductivity would be in the range of 10 W / mK or higher.

[0035] Because the internal torus shape of the bearing shields or adapter bearing shields mechanically deforms the respective winding head and fixes it under mechanical tension, a very good thermal connection to the bearing shield occurs during operation of the dynamoelectric machine and, according to the invention, the preceding forming and taping process of the winding head can be dispensed with.

[0036] In the area of ​​the outer surface of the stator, there is the possibility of using the stator's laminated core by means of a cooling fin external structure, which represents the outer surface of a housing that is no longer required.

[0037] In this case, the normally mechanically fixing effect of the housing on the stator's laminated core must be taken into account, but this housing is not present in the invention. One possible way of mechanically fixing the stator's laminated core is, among other things, the full bonding of the stator's laminated core or a suitable external coating, which, on the one hand, closes the gaps between the individual sheets and, on the other hand, ensures the mechanical stability of the laminated core.

[0038] The motor can then be completed and the rotor inserted into the motor.

[0039] The motor is not yet impregnated in this state. Liquid impregnation resin can now be introduced into the stator winding system through the terminal box base opening or, if necessary, other impregnation openings provided. It is advisable to use a two-component (2-K) impregnation resin premixed via a dispensing unit or static mixing tube. This resin gels at comparatively low temperatures, e.g., room temperature, within a few hours, preferably under an hour, and then hardens at room temperature.

[0040] The terminal box base is normally located on the NDE side of the motor. The NDE (non-drive end) side is the side of the motor opposite the machine driven by the motor (gearbox, compressor, pump, etc.).

[0041] The DE side (drive-end side) is the side of the engine facing the working machine.

[0042] This avoids the time and effort required for thermal curing in a furnace and cooling zone. Possible resins include amine-cured epoxies or polyurethane systems.

[0043] During the impregnation process, the entire motor can be held by its pre-assembled shaft and set in rotation along this shaft. This makes it possible to distribute the inflowing resin, e.g., along a tilted rotation axis throughout the entire motor, particularly the winding system, i.e., in the stator slots and the winding heads. The bearing plate and the shaft are fixed to each other to enable this rotation.

[0044] When filled from one side, the bearing plate there acts as a type of resin reservoir that can be filled up to the edge of the stator bore (depending on the angle of inclination). Due to the inclination and a suitable rotational and / or wobbling movement (precession and nutation possible) along the slots, the resin flows essentially axially through the stator. This occurs, for example, via capillaries in the winding in the slots and / or between a slot box paper and a cover slide paper as a channel, until the resin has reached and filled the winding overhang on the other side of the stator.

[0045] Due to the capillary effect, the resin flows preferentially into the winding until a certain saturation point is reached (principle of trickle impregnation on horizontally positioned and rotating stators). By precisely dosing the correct amount of resin for each stator into each bearing plate and adjusting the inclination angle and rotation speed as needed, the resin is distributed evenly throughout the entire winding system of the stator (winding heads and windings in the slots).

[0046] Above all, a predetermined rotation speed prevents resin flow radially inwards into the air gap due to the centrifugal force, but nevertheless ensures sufficient wetting of the winding system.

[0047] The specified rotation speeds include a wide variety of movement patterns with regard to rotations and / or tumbling movements, both in terms of the speeds applied and the duration and / or intensity of these movement patterns.

[0048] In order to make this process more precise, the viscosity as well as the gelling and curing speed of the 2-component resin can be adjusted from the chemical side of the resin in such a way that when the resin is completely absorbed into the copper winding (i.e. winding head on the NDE side - grooves - winding head on the DE side), its viscosity has already increased to such an extent that it remains there against gravity and through the capillaries.

[0049] A change of the tilt angle further or completely to the horizontal would allow a longer gelling time at this point (resin reservoir bearing plate NDE side empty, resin completely in the winding, similar to trickling process) without losing resin through dripping or contaminating the system.

[0050] Which technical design is used depends on the manufacturing effort, e.g. the manufacturing cycle times, the material price of the resin and the system price for the desired motor variations, such as different windings, axle lengths, etc.

[0051] As soon as this filling process is completed and the resin has changed its rheology up to a limiting viscosity, i.e. has gelled, the manufacturing process is completed and the finished engine can be stored or packaged.

[0052] Preferred two-component resins cure within 24 hours at room temperature, thus achieving their final properties. This ensures that the engine is ready for use after just 24 hours without any further treatment.

[0053] The impregnation process can be significantly simplified by using specially manufactured plastic or, if necessary, ceramic bearing shields, which form the winding head and form a housing with the end face of the laminated core. In particular, the use of two-component resin systems, which react at very low temperatures, especially room temperature, and thus gel and harden, can eliminate the need for complex conventional heating and cooling processes during production (e.g., plant investment, factory space planning, cycle times, energy, CO2).

[0054] The resin is introduced through the terminal board opening on the NDE end bearing shield. The finished motor can be held by its shaft and rotated slightly tilted from the vertical, allowing the resin to be evenly distributed throughout the winding and hardened. The NDE end bearing shield initially acts as a resin reservoir for the subsequent impregnation process.

[0055] If the bearing shield is made of metal, insulation is necessary at least within the toroidal bearing shield that comes into contact with the winding system.

[0056] In a further embodiment, at least on the NDE side, only an adapter bearing shield is provided, which allows the use of one or more nozzles (radially from the inside to the winding head or the winding heads) for introducing the impregnating resin and, after completion of the impregnation process, enables subsequent axial insertion of the rotor together with a bearing element.

[0057] The nozzle or nozzles of an impregnation device are inserted axially into the stator bore via an opening in the adapter plate, and at least the NDE-side winding overhang is pressurized with impregnating resin. If there are several nozzles, at least one or more nozzles can be provided per winding overhang to accelerate the impregnation process. The impregnation resin is distributed as described above. The resin flows essentially axially through the stator due to the inclination and a suitable rotary movement and / or wobbling movement of the stator (precession and nutation are possible) along the slots. This happens, for example, via capillaries in the winding in the slots and / or between a slot box paper and a cover slide paper as a channel, until the resin has reached and filled the winding overhang on the other side of the stator.

[0058] Due to the capillary effect, the resin flows preferentially into the winding until a certain saturation point is reached (principle of trickle impregnation on horizontally positioned and rotating stators). By precisely dosing the required amount of resin for each stator via the nozzle and adjusting the inclination angle and rotation speed as needed, the resin is distributed evenly throughout the entire winding system of the stator (winding heads and windings in the slots).

[0059] Above all, a predetermined rotation speed prevents resin flow radially inwards into the air gap due to the centrifugal force, but nevertheless ensures sufficient wetting of the winding system.

[0060] This specified rotational speed includes a wide variety of motion patterns with respect to rotations and / or wobbling movements, both due to the applied speeds and the duration and / or intensity of these motion patterns. It depends, among other things, on the winding systems used, the desired insulation strength, the axial length, and the diameter of the stator.

[0061] In order to make this process more precise, the viscosity as well as the gelling and curing speed of the 2-component resin can be adjusted from the chemical side of the resin in such a way that when the resin is completely absorbed into the copper winding (i.e. winding head on the NDE side - grooves - winding head on the DE side), its viscosity has already increased to such an extent that it remains there against gravity and through the capillaries.

[0062] A change of the tilt angle further or completely to the horizontal would allow a longer gelling time at this time (resin reservoir bearing plate NDE side empty, resin completely in the winding, similar to trickling process) without losing resin through dripping or contaminating the system.

[0063] Only after impregnation and before axial insertion of the rotor is the bearing seat created on the NDE side in the adapter bearing shield, for example by turning out the inside of the adapter bearing shield.

[0064] The bearing element and adapter bearing shield then together form the bearing shield on the NDE side.

[0065] Which technical design is used depends on the manufacturing effort, e.g. the manufacturing cycle times, the material price of the resin and the system price for the desired motor variants, such as different windings, axle lengths, etc.

[0066] Conventional impregnation processes are cold dipping processes with styrenic polyesterimide resins and subsequent oven sections, which are much more complex due to the less focused use of energy.

[0067] Due to the geometric internal shape of the bearing shields or adapter bearing shields, which forms and solidifies the winding head when fitted, the manufacturing steps of forming and bandaging are no longer necessary.

[0068] A dynamoelectric machine manufactured in this way is suitable for a wide range of industrial applications such as pumps, compressors, fans, etc., e.g. in the food industry, steel industry, etc., due to its simple structure, reliable impregnation and optimized cooling.

[0069] The invention and further advantageous embodiments of the invention are explained in more detail using exemplary embodiments shown in principle, in which: FIG 1 shows a basic longitudinal section of a dynamo-electric machine,

[0070] FIG 2 Detailed view of a front side with coated bearing shield,

[0071] FIG 3 Detailed view in assembled state,

[0072] FIG 4 Detailed view of a front side,

[0073] FIGS 5 to 7 a basic manufacturing process,

[0074] FIG 8 NDE-side split bearing shield,

[0075] FIG 9 Bearing element .

[0076] It should be noted that terms such as "axial," "radial," "tangential," etc., refer to the axis 16 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 16 of the rotor 3 and thus to the corresponding axis of symmetry of the stator 2. "Axial" describes a direction parallel to the axis 16, "radial" describes a direction orthogonal to the axis 16, toward it, or away from it, and "tangential" is a direction that is directed circularly around the axis 16 at a constant radial distance from the axis 16 and at a constant axial position. The term "in the circumferential direction" is synonymous with "tangential."

[0077] 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.

[0078] The term "coaxial components", e.g. coaxial components such as rotor 3 and stator 2, refers here to components that have the same normal vectors, i.e. for which the planes defined by the coaxial components are parallel to one another. Furthermore, the expression should include that the centers of coaxial components lie on the same axis of rotation or symmetry. However, these centers can possibly lie at different axial positions on this axis and the said planes can therefore have a distance >0 from one another. The expression does not necessarily require that coaxial components have the same radius.

[0079] The term "complementary" in the context of two components which are "complementary" to one another means that their external shapes are designed in such a way 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 objects which are complementary to one another, 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".

[0080] For the sake of clarity, in some cases where components are present more than once, not all of the components shown are provided with reference symbols in the figures.

[0081] The described embodiments can be combined in any way. Individual features of the respective embodiments can also be combined without departing from the essence of the invention.

[0082] FIG 1 shows a basic longitudinal section of a dynamoelectric machine 1 with a stator 2. In the magnetically conductive hollow cylindrical body of the stator 2, which is designed as an axially layered laminated core, there is a winding system 21 positioned in slots 5 of the stator 2, which forms winding overhangs I, II on the end faces III, IV of the stator 2. The slots 5 face the inner circumferential surface 18 of the stator 2. Spaced apart from the inner circumferential surface 18 of the stator 2 by an air gap 4 is a rotor 3, which in this case is designed, for example, as a squirrel-cage rotor 7. The rotor 3 could also be equipped with permanent magnets in addition to or instead of permanent magnets in order to form a line-start motor or to operate as a permanent-magnet synchronous motor.

[0083] The rotor 3 is rotationally connected to a shaft 15 and rotates about an axis 16 during operation of the dynamoelectric machine 1. Bearing shields 8 for receiving bearings 13 that support the shaft 15 are attached to the end faces III, IV of the stator 2. A terminal box base 17 is also provided on a bearing shield 8. The winding overhangs I, II are surrounded by an impregnating resin 23, as is the winding 21 in the slots 5.

[0084] The description of the above-mentioned frameless dynamoelectric machine 1 represents the final product. The following figures describe the manufacturing process in more detail.

[0085] FIG 2 shows a detailed illustration of the end face IV of the stator 2 without the rotor 3, wherein the bearing plate 8 has not yet been placed on the winding overhang II. The bearing plate 8 of the end face IV has a shaft passage 24 and a bearing receptacle 11 for inserting a ball or roller bearing. Furthermore, the bearing plate 8 has a receiving space 9 for the winding overhang II. The receiving space 9 of the bearing plate 8, which is designed in particular as a half-open torus shape, is thus designed such that the winding overhang II is shaped and compressed in order to create a comparatively good heat conduction from the winding overhang II to the bearing plate 8. This side is also referred to as the drive end (DE side) of the motor.

[0086] These relationships naturally also apply to the processes on the other end face III with the winding head I .

[0087] In the embodiment according to FIG. 2, the bearing plate 8 has a coating 12, in particular a hydrophobic coating 9, in its receiving space 9. This allows, among other things, the bearing plate 8 to be easily separated from the winding head I, II, e.g., for disassembly of the dynamoelectric machine 1.

[0088] Furthermore, the bearing shields 8 have a circumferential edge 10 for additional shaping of the winding head I, II and for guiding the impregnating resin 23.

[0089] FIG 3 shows the process described above in the assembled state. The bearing plate 8 forms a positive fit with the end face IV of the stator 2 at its radially outer edge.

[0090] FIG. 4 shows the process described above in the assembled state, with the bearing plate 8 not coated in this case. The bearing plate 8 again forms a positive fit with the end face IV of the stator 2 at its radially outer edge.

[0091] Basically, the winding head I, II is formed, compressed and thermally connected to the respective bearing plate 8 by the bearing plates.

[0092] FIGS. 5 to 7 show the basic manufacturing process of such a dynamoelectric machine 1. The stator 2 is provided with the winding system 21, which has been positioned in the slots 5 by trickling or drawing-in processes. In this case, winding overhangs I, II are formed on the end faces III, IV and provided with the bearing shields 8 on the respective end faces III, IV. A bearing shield 8 is provided with the terminal box base 17, via which the winding system 21, i.e. winding overhangs I, II and the winding in the slots 5, on this side of the dynamoelectric machine 1 is provided with the impregnation resin 23. Due to corresponding movement patterns of the dynamoelectric machine 1, such as tilting and rotation as shown in FIG. 6 during the assembly process, the impregnation resin 23 is now distributed, as shown by the corresponding hatching.The impregnating resin 23 is first fed into the receiving space 9 of the winding head I on the end face III and is then distributed axially into the slots 5 provided with the winding system 21 and, as FIG. 7 shows, also ultimately into the receiving space 9 of the winding head 11.

[0093] Due to the centrifugal forces associated with the rotation, the impregnating resin 23 does not penetrate into the space of the rotor 3 during assembly either via the receiving space 9 or via the groove slots 22.

[0094] In a further embodiment according to FIG 8, only an adapter bearing shield 26 is provided on the NDE side of the dynamoelectric machine 1, which allows the use of nozzles 28 for introducing the impregnating resin 23 and enables subsequent axial insertion of the rotor 3 together with a bearing element 27 from the NDE side.

[0095] The nozzle 28 of an impregnation device (not shown in detail) is introduced axially via the adapter bearing plate 26 into the stator bore or inner casing surface 18 and at least the NDE-side winding overhang I is supplied with impregnation resin 23. The distribution of the impregnation resin 23 takes place as described above. Due to the inclination and a suitable rotational movement and / or wobbling movement of the stator 2 (precession and nutation possible) along the slots 5, the resin flows essentially axially through the stator 2, for example via capillaries of the winding 21 in the slots 5 and / or between a slot box paper and a cover slide paper as a channel, until it has reached and filled the winding overhang II located on the other side of the stator 2.

[0096] Only after impregnation and before inserting the rotor 3 is the bearing seat on the NDE side rotated.

[0097] The bearing element 27 according to FIG. 9 and the adapter bearing shield 26 together form the bearing shield 8 on the NDE side. As also described in FIG. 1, this creates a housing-less dynamoelectric machine 1 that can be manufactured in a simple manner. Coating the receiving spaces 9 of the bearing shields 8 or adapter bearing shields 26 and / or the bearing elements 27 allows the dynamoelectric machine 1 to be easily disassembled and, if necessary, components of this dynamoelectric machine 1 to be reused / recycled in other machines.

[0098] In order to improve the cooling, in particular of the stator 2, surface-enlarging structures 20 are provided on the outer surface 19 of the hollow cylindrical body of the stator 2.

[0099] However, for applications of such a dynamoelectric machine 1, in particular in the food industry, it may be advantageous if the outer surface 19 is smooth or provided with a coating.

Claims

Patent claims 1. A method for producing a stator (2) of a dynamoelectric rotary machine (1), in particular a housingless dynamoelectric machine, with a magnetically conductive hollow cylindrical body, in particular a laminated core (25) made of axially layered sheets, wherein grooves (5) point to an inner circumferential surface (18) of the hollow cylindrical body, in which grooves a winding system (21) is arranged, which forms winding heads (I, II) on the end faces (III, IV) of the hollow cylindrical body, wherein the winding heads (I, II) are at least partially surrounded by toroidal bearing shields (8) or adapter bearing shields (26) that are open on one side, wherein the bearing shields (8) terminate at least in the radially outer region of the hollow cylindrical body with the end faces (III, IV) of the hollow cylindrical body, by the following steps: - producing a magnetically conductive hollow cylindrical body, in particular a laminated core (25) made of axially layered sheets, wherein grooves (5) point towards an inner surface (18) of the hollow cylindrical body and surface-enlarging structures (20) are formed on the outer surface (19) of the hollow cylindrical body or are smooth, - positioning a winding system (21) in the slots (5) so that winding heads (I,II) are formed on the end faces (III, IV) of the hollow cylindrical body, - Pressing half-open toroidal bearing shields (8) onto the winding heads (I,II) on the end faces (III, IV) of the hollow cylindrical body, and inserting the rotor (3), - introducing liquid impregnating resin (23) into at least one receiving space (9) of a winding head (I, II) of the stator (2), in particular via a terminal box base (17), wherein the dynamoelectric rotary machine (1) is held on the shaft (15) of the rotor (3) and by tilting the axis (16) and / or rotary and / or wobbling movements, the Distribution of the impregnating resin (23) in the groove (5) and the DE and NDE side bearing shield (8) causes - wherein a predetermined rotational speed due to the centrifugal force prevents a resin flow radially inwards into the air gap, but nevertheless creates sufficient wetting of the winding system (21) so that the inner surface (18) remains free of impregnating resin (23).

2. A method for producing a stator (2) of a dynamoelectric rotary machine (1), in particular a housing-less dynamoelectric machine, with a magnetically conductive hollow cylindrical body, in particular a laminated core (25) made of axially layered sheets, wherein grooves (5) point to an inner circumferential surface (18) of the hollow cylindrical body, in which grooves a winding system (21) is arranged, which forms winding heads (I, II) on the end faces (III, IV) of the hollow cylindrical body, wherein the winding heads (I, II) are surrounded at least in sections by toroidal bearing shields (8) or adapter bearing shields (26) that are open on one side, wherein the bearing shields (8) terminate at least in the radially outer region of the hollow cylindrical body with the end faces (III, IV) of the hollow cylindrical body, by the following steps: - producing a magnetically conductive hollow cylindrical body, in particular a laminated core (25) made of axially layered sheets, wherein grooves (5) point towards an inner surface (18) of the hollow cylindrical body and surface-enlarging structures (20) are formed on the outer surface (19) of the hollow cylindrical body or are smooth, - positioning a winding system (21) in the slots (5) so that winding heads (I,II) are formed on the end faces (III, IV) of the hollow cylindrical body, - Pressing half-open torus-shaped bearing shields (8) or adapter bearing shields (26) onto the winding heads (I,II) on the front sides (III, IV) of the hollow cylindrical body, - introducing liquid impregnating resin (23) into at least one receiving space (9) of a winding head (I, II) of the stator (2), in particular via an axial opening in the adapter bearing plate (26), wherein the stator (2) of the dynamoelectric rotary machine (1) is held on the outer circumference and by tilting the axis (16) and / or rotary and / or wobbling movements, the distribution of the impregnating resin (23) in the groove (5) and the DE and NDE side bearing plate (8) is effected - wherein a predetermined rotational speed due to the centrifugal force prevents a resin flow radially inwards into the air gap, but nevertheless creates sufficient wetting of the winding system (21) so that the inner surface (18) remains free of impregnating resin (23).

3. A method for producing a stator (2) of a dynamoelectric rotary machine (1) according to claim 1 or 2, characterized in that a premixed two-component impregnating resin is used as the impregnating resin (23).

4. Method for producing a stator (2) of a dynamoelectric rotary machine (1) according to one of claims 1 to 3, characterized in that the movements of the axis (16) with stator (2) are carried out by means of a clamping device, which movement at least temporarily during the loading process with impregnating resin (23) takes place in such a way that leakage of the impregnating resin (23) via a groove slot (22) is prevented, inter alia, due to the centrifugal forces of these movements.

5. Dynamoelectric rotary machine (1), in particular a housingless dynamoelectric machine, with a magnetically conductive hollow cylindrical body, in particular a Laminated core (25) made of axially layered sheets, as a stator (2), wherein grooves (5) point towards an inner circumferential surface (18) of the hollow cylindrical body, in which grooves a winding system (21) is arranged which forms winding heads (I, II) on the end faces (III, IV) of the hollow cylindrical body, i.e. of the stator (2), wherein the winding heads (I, II) are surrounded at least in sections by toroidal bearing shields (8, 26) which are open on one side, wherein the bearing shields (8) terminate at least in the radially outer region of the hollow cylindrical body with the end faces (III, IV) of the hollow cylindrical body, wherein the inner circumferential surface (18) is free of impregnating resin (23).

6. Dynamoelectric rotary machine (1) according to claim 5, characterized in that surface-enlarging structures (20) are provided on the outer surface (19) of the hollow cylindrical body, i.e. the stator (2), 7. Dynamoelectric rotary machine (1) according to claim 5 or 6, characterized in that the bearing shields (8, 26) are made of metal, plastic, in particular a thermoplastic or ceramic.

8. Dynamoelectric rotary machine (1) according to one of the preceding claims 5 to 7, characterized in that the bearing shields (8, 26) are in one piece or in two parts, in particular coaxially in two parts.

9. Dynamoelectric rotary machine (1) according to one of the preceding claims 5 to 8, characterized in that the bearing shields (8, 26) are coated internally, in particular have a hydrophobic coating (12) and / or an insulating layer.

10. Dynamoelectric rotary machine (1) according to one of the preceding claims 7, 8 or 9, characterized in that the bearing plate (8, 26) made of thermoplastic has additives for mechanical stabilization and / or for improved thermal conductivity.

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