Method for manufacturing a reluctance rotor of a dynamo-electric machine for high-speed operation

Abstract

The invention relates to a method for manufacturing a reluctance rotor (3) of a dynamo-electric machine (1), the method comprising: - producing a plurality of rotor laminations (10) which are arranged axially one behind the other along an axis of rotation (9) on a shaft (5) to form a laminated core of the reluctance rotor (3), and, depending on the lamination cut, form two, four or another even number of poles, in that, in each rotor lamination (10), flux-guiding regions (13) are separated from one another by non-magnetic, arcuate flux barriers (14) and thereby form q-axes (12) and d-axes (11) of the reluctance rotor (3), wherein the rotor laminations are formed in one piece and form an outer ring made up of webs, wherein, via at least one distribution disc (20) arranged at an end face of the laminated core, the at least radially outer flux barriers (14) are filled with a liquid adhesive (19) over the entire axial length of the reluctance rotor (3) while the laminated core is axially clamped, so that the provided flux barriers (14) are filled with adhesive (19); - solidifying the laminated core provided with adhesive; - turning down the solidified laminated core, wherein the webs forming the outer ring are removed, so that the flux barriers (14) are not closed by metal towards the outside and, as a result, the radially outer ends of the flux barriers (14) open into the outer circumference of the rotor laminations (10); - drip-applying resin or a resin-hardener system onto the turned-down outer surface of the reluctance rotor (3); - before, at the same time as, or after this drip-applying operation, tensioning a bandage onto the turned-down outer circumference of the reluctance rotor (3), characterised in that the at least one distribution disc (20) is fixed to the end face of the laminated core by means of positioning elements.

Description

[0001] Description

[0002] Method for manufacturing a reluctance rotor of a high-speed dynamo-electric machine

[0003] The invention relates to a reluctance rotor of a dynamo-electric machine, in particular a reluctance synchronous machine, a method for its manufacture, a dynamo-electric machine with such a reluctance rotor, as well as the use of such a dynamo-electric machine.

[0004] A dynamo-electric machine is a device that converts electrical energy into mechanical energy, in particular kinetic energy (motor operation) and / or mechanical energy into electrical energy (generator operation). In a rotating dynamo-electric machine, a stator is provided, in whose so-called stator bore a rotor is rotatably mounted. The stator is fixed relative to the rotor. The stator and the rotor are linked by a magnetic flux, which, in motor operation, generates a force that drives the rotor to rotate relative to the stator and, in generator operation, converts the mechanical energy supplied to the rotor into electrical energy.

[0005] Reluctance machines, by design, have a rotor structure characterized by flux-conducting and flux-blocking parts. To hold this structure together, internal and external webs are typically used; however, these allow unwanted magnetic leakage flux and reduce the efficiency of the reluctance machine.

[0006] A rotor for a reluctance motor is known, for example, from US 5,818,140 A. This patent describes a rotor whose laminated core consists of rotor laminations, each with cutouts. This rotor is also referred to there as a Vagati rotor. The cutouts create curved, strip-shaped sections of laminations that serve as flux guides and direct the magnetic flux in the manner necessary to provide the required reluctance of the rotor. Between the individual flux guides, the cutouts create an air gap, i.e., a non-magnetic region that acts as a magnetic flux barrier. The strip-shaped flux guides result in a high torque output.

[0007] The performance of such a rotor depends crucially on the design of the areas with high magnetic conductivity, which are also referred to as laminations. These areas are arranged around one or more axes of high magnetic conductivity (d-axis) and alternate circumferentially with areas of lower magnetic conductivity, which are arranged around one or more axes of lower magnetic conductivity (q-axis). To achieve these varying magnetic conductivities within the rotor, the rotor laminations are, for example, provided with punched-out recesses. A wide variety of methods exist for this purpose.

[0008] Types of embodiment.

[0009] To achieve the highest possible torque output, the rotor laminations are dimensioned so that the equivalent circuit reactance in the q-axis direction is as small as possible. Therefore, numerous and / or large-area cutouts are typically incorporated into the rotor lamination in the q-axis direction. However, this weakens the mechanical stability, thus limiting the rotational speed. To improve mechanical stability, the rotor laminations feature a circumferential outer ring. Such rotor laminations are available, for example, from...

[0010] JP 2001 / 238418 A is known. In addition, the recesses or cutouts are interrupted approximately in the middle by a bridge.

[0011] EP 0 621 677 A2 describes another rotor assembly for a reluctance motor that does not have an outer ring. The interior spaces are filled with glass fibers and a thermosetting epoxy. The rotor assembly has an end cap at each end. To increase the mechanical stability of the rotor assembly, four webs are provided, extending around the circumference of the rotor laminations between the end plates. Two opposing webs are also connected to each other by radially extending screws, so that individual rotor laminations through which the screws pass have an additional, diametrically oriented bore (receiving bore). This necessitates a complex fastening system comprising several fasteners in the axial and radial directions to hold the rotor assembly together.

[0012] EP 2 965 403 A1 describes a rotor in which the flux barriers are filled with a plastic material. This filling, together with specific contours in the sheet metal (bores and dovetail grooves), creates positive interlocks, thus ensuring cohesion of the sheet metal structure. This also applies to the air gap even after the rotor has been over-rotated. However, a disadvantage is that the contours in the sheet metal required for these positive interlocks reduce the efficiency gain of the dynamo-electric machine. Therefore, to achieve a significant increase in rotational speed, large geometrically defined positive interlocks are necessary.

[0013] The Patent Abstract of Japan for JP 2000-299947 A describes a reluctance motor in which magnetic path-forming elements are attached to a rotor without connecting webs to improve efficiency. The magnetic path-forming elements are separated from each other by spaces filled with an adhesive resin. This resin both magnetically separates the magnetic path-forming elements and mechanically bonds them together.

[0014] From the Patent Abstract of Japan for JP 2002-095227 A, a rotor of a reluctance motor is known which has a rotor made of stacked laminations. Arc-shaped slots are cut into the laminations, which have dovetail-shaped recesses on their circumference. The slots and recesses are filled with a resin. A disadvantage of this design is that, in order to increase the speed capability of a reluctance motor, the rotor must therefore be made with relatively wide webs, which, however, reduces the efficiency of the reluctance motor.

[0015] Based on this, the object of the invention is to create a reluctance rotor that is relatively easy to manufacture and yet has improved functionality and thus also improved efficiency of a reluctance motor.

[0016] The solution to the given problem is achieved through the combination of features of the independent claims.

[0017] Advantageous embodiments of the invention can be found in the dependent claims.

[0018] The advantages and preferred designs listed below with regard to the rotor can be applied analogously to the method for manufacturing a rotor.

[0019] The invention describes a reluctance rotor which, when used in a reluctance motor, contributes to increased efficiency and exhibits, among other things, improved speed capability. However, this does not require positive locking mechanisms or special contours in the sheet metal as are required in the prior art. The sheet metal contour of the reluctance rotor can be designed solely for maximum efficiency.

[0020] The advantages and preferred designs mentioned in relation to the method for manufacturing a reluctance rotor can, at least in part, also be applied analogously to the reluctance rotor.

[0021] According to the invention, the rotor laminations are first equipped with external webs, as is customary, to ensure stability during the manufacturing process (e.g., stamping). The central web – also referred to as the center web – can be reduced in size or, in the case of smaller shaft heights, omitted entirely.

[0022] The rotor laminations are stacked onto the shaft, which also forms the later drive shaft of the reluctance motor and is positioned with at least one distribution disc on one end face of the lamination stack.

[0023] Under axial tension of the laminated core, an adhesive is injected via the distribution disc so that the flux barriers are filled with adhesive. Preferably, a two-component adhesive is used.

[0024] The distribution disc, which forms the basis of the casting process according to the invention and is attached to at least one end face of the reluctance rotor's lamination stack, is fixed to the lamination stack of the reluctance rotor via positioning elements of the distribution disc. This avoids axial support of the distribution disc on the shaft, which further simplifies the manufacturing process of the reluctance rotor.

[0025] This distribution disc is form-fitting and attached to the front of the sheet metal stack and can optionally also be used to balance the reluctance rotor after the casting process.

[0026] The distribution disc has at least one circumferential distribution channel on the side facing the lamination stack of the reluctance rotor, open towards the lamination stack, in particular towards the poles of the reluctance rotor.

[0027] On the side of the distribution disc facing away from the lamination stack, at least one injection opening is provided for a pressure-controlled supply of an adhesive to fill the distribution channel with a potting compound and thus the lamination stack of the reluctance rotor. Optionally, the distribution channel – viewed along its entire length – has radial and / or axial extensions in the area of ​​a flux barrier at one pole of the reluctance rotor – acting as a kind of reservoir – to provide sufficient potting compound for the respective magnetic pole.

[0028] The distribution channel, and optionally its extension, form a tight, form-fitting seal with the end face of the lamination stack to generate the necessary pressure and shear forces in the potting compound during the casting process. The circumferential distribution channel supplies the axial recesses of the magnetic poles with the potting compound or an adhesive.

[0029] The distribution disc can have one or more circumferential distribution channels and / or junction openings to ensure the fastest possible filling of the sheet metal stack or the flow barriers.

[0030] The distribution disc is fixed to the front face by means of positioning elements, which are designed, for example, in the form of pins or dowels and are integrally formed with the distribution disc.

[0031] The distribution disc is axially fixed to the front face of the rotor's laminated core by means of its positioning elements prior to the potting process, by anchoring the positioning elements in existing, corresponding openings of the laminated core, such as recesses, inertia recesses, flux barriers, etc., in particular by means of force-fit anchoring.

[0032] The "resistance force" of the positioning elements or the length of the pins or dowels with their clamping function must therefore be dimensioned so that it is at least equal to, but preferably higher than, the axial repulsion forces occurring during the manufacturing process, so that the distribution disc does not detach from the front face of the sheet metal stack during the casting process and continues to maintain its axial positive locking.

[0033] According to the invention, the cast-on pins are therefore designed with a slight excess compared to the corresponding openings of the sheet metal stack, ideally with a cross contour.

[0034] Alternatively, a spreading shape for the positioning elements, similar to a dowel, is also conceivable.

[0035] These positioning elements enable coaxial clamping or clawing of the distribution disc on the front face of the sheet metal stack.

[0036] The distribution channel can be circular in its entirety. It is also possible to design the distribution channel with radially and / or axially extending enlargements and / or a corrugated shape to achieve sufficient fill level in the recesses as quickly as possible. The path of the distribution channel essentially follows the pole arrangement. This applies to both the coverage area of ​​the distribution disc and the coverage area of ​​the distribution channel at the end face of the lamination stack.

[0037] The distribution disc can optionally be additionally equipped on the side of the distribution disc facing away from the distribution channel with

[0038] The machine is equipped with fan blades to generate cooling in the operation of the reluctance machine, particularly in the winding head space, and thus improve heat dissipation from the reluctance rotor and / or the winding head space at the front of the stator.

[0039] The distribution disc can be manufactured as an injection-molded part, a deep-drawn part, or using 3D printing. Preferably, the distribution disc is made of plastic or non-magnetic metal. The positioning elements, such as pins or dowels, or, for example, the optional fan blades, form a single component with the distribution disc. During the injection molding process of the recesses above the distribution disc, the rotor's laminated core can be additionally axially clamped over these distribution discs using a tool to ensure a seal between the distribution disc and the laminated core, as well as between the individual laminated sheets.

[0040] The distribution disc is axially fixed and positioned on the rotor's laminated core and does not require the shaft for this; therefore, no clamping on the shaft is required for the distribution disc.

[0041] By using the distribution disc and sealing the distribution channel open towards the front, the optionally used clamping tool is protected from contamination and can therefore be used immediately afterwards for subsequent actions - without further cleaning actions.

[0042] The optional clamping tool also serves to bundle the lamination stack of the reluctance rotor during the filling process. This bundling – i.e., the application of an axial force to the lamination stack – is achieved via the distribution discs and / or the radial clearance between the distribution disc and the shaft.

[0043] The distribution disc can have elastic geometries in the direction of the rotor package, or alternatively, sealing material that improves axial sealing during clamping during the potting process with potting compound or adhesive.

[0044] Optionally, distribution discs are positioned on both sides of the reluctance rotor's lamination stack, i.e., the end faces of the stack, to potentially improve the stacking of the laminations. At least one distribution disc is equipped with a feed opening, i.e., an adhesive supply opening, or injection opening. To ensure both parts are identical, a supply opening can be provided that is sealed by a casting skin. If necessary, this casting skin can be broken out of the distribution disc before potting. This reduces the number of parts required.

[0045] This manufacturing process is also suitable for axially staggered rotor lamination stacks. The recesses of the individual poles have sufficient axial overlap to allow the potting compound to be conveyed to the opposite axial end of a pole's lamination stack. Flow barriers of axially successive lamination stacks within a pole have sufficient surface overlap to ensure proper filling. However, as already mentioned above, the entire lamination stack has a distribution disc on at least one end face.

[0046] Advantageously, the rotor is supplied with adhesive or, more generally, with flowable, adhesive potting compound as an ascending potting process under increased potting pressure.

[0047] With only one distribution disc, the recesses on the other end face of the sheet metal stack are closed, e.g. by an end disc, so that no potting compound can escape and a thixotropic effect of the potting compound can occur.

[0048] The axis of the rotor is essentially vertical.

[0049] In particular, a bubble-free application can be achieved easily by means of an ascending pouring technique.

[0050] In another possible process step, the rotor is filled with potting compound from above, i.e., the potting compound is poured in from the top. Any air present in the flux barriers is forced out between the laminations. Therefore, there is no risk of void formation. Due to the thixotropic properties of the potting compound, no adhesive seeps through or between the laminations of the laminated core.

[0051] The filling process occurs regardless of whether the rotor poles are parallel to the axis, inclined, or staggered. The crucial factor is always that the potting compound can penetrate axially through the flow barriers of one pole and / or the aforementioned gaps and fill the flow barriers of that pole.

[0052] In the potting process, a static / dynamic mixing tube is used to mix the reactive mixture in situ and then apply it directly to at least one end face of the rotor via the distribution disc. Distribution discs can also be provided on both end faces of the rotor to allow for filling from both sides. The rotor axis is preferably horizontally oriented.

[0053] The distribution discs are either identical or designed in such a way that each distribution disc only applies adhesive or potting compound to half of the poles of the reluctance rotor, i.e., at least their flux barriers.

[0054] Applying potting compound from both sides can be particularly advantageous for axially long reluctance rotors.

[0055] One or more suitable injection ports on the distributor disc can be used for

[0056] Pressures of up to 10 bar, preferably 4.5 bar, are applied, whereby the preferably freshly mixed, thixotropic potting compound becomes flowable and flows axially, in particular axially upwards, into the remaining geometric spaces of the recesses of the rotor.

[0057] The thixotropic adhesive compound is mixed in situ in a static or dynamic mixing tube. The potting compound is supplied at a temperature of up to 60°C, particularly up to 30°C, and at a flow rate of up to 10 mm per second, under a pressure of up to 10 bar, particularly 4.5 to 5 bar, i.e., essentially at ambient temperature. The potting process can therefore take place at near ambient temperature, which simplifies the process and allows for almost immediate subsequent processing of the rotor.

[0058] The radial planes between the individual rotor laminations can be coated with adhesive, but this is not mandatory. This can be ensured, in particular, by axial packing together with the thixotropic adhesive compound. The adhesive compound thus fills at least the flux barriers, and optionally radial gaps between the individual rotor laminations, i.e., the planes that are perpendicular to the axis.

[0059] Similarly, the inertia openings of the reluctance rotor are not coated with adhesive. Likewise, the holes for the pins / dowels of the distribution disc are generally not coated with adhesive. That is, the pins / dowels are not surrounded by adhesive.

[0060] However, in one version, the pins / dowels of the distribution disc are surrounded by adhesive if they are positioned and anchored in the flow barriers.

[0061] After the recesses are completely filled, the pressure is released. Detection that the sheet metal stack is "full" with the crucial gaps is achieved by comparing the static pressure to the dynamic pressure (detection, for example, by measuring the pressure build-up of dynamic versus static pressure).

[0062] Once all flow channels are completely filled, the flow of the potting compound ceases and can be detected by a change in the total pressure according to Bernoulli's principle. Bernoulli's pressure equation (Total pressure = Dynamic pressure + Static pressure).

[0063] Optical monitoring of the casting process is also possible, detecting any unwanted leakage at the surface of the cylindrical lamination stack. This is primarily done at the narrow webs that act as edge boundaries of the flux barriers to the surface. These webs, viewed radially, can be only a few millimeters or even fractions of a millimeter in diameter and are also referred to as edge webs.

[0064] The potting compound in the sheet metal package of the reluctance rotor then gels without pressure at room temperature and hardens completely within 24 hours.

[0065] Further work on and with the reluctance rotor without mechanical stress is possible after approximately one hour. The thixotropic properties of the potting compound prevent penetration of the material through the individual sheets, thus eliminating the need for a prior painting process of the outer surface.

[0066] According to the invention, the flux barriers of the reluctance rotor are encased via a distribution disk with a thixotropic adhesive compound which gels and fully hardens at room temperature.

[0067] Due to the high filling and use of thixotropic additives in the adhesive mass, the flux barriers can be filled, especially in an ascending direction, using a pressure process, without the reactive mass being able to escape through small gaps, such as between the individual sheets.

[0068] A "gap filler," preferably a thixotropic two-component epoxy, is used as a potting compound or adhesive to bond the permanent magnets in their respective pockets, with a temperature resistance of up to approximately 160 °C. Conventional adhesive systems are only suitable up to 120 °C.

[0069] In the claimed method, the potting compound advantageously exhibits thixotropic behavior, wherein the viscosity decreases as a result of an external controllable influence (e.g. pressure) and returns to the initial viscosity after the stress has ceased.

[0070] By using the thixotropic adhesive, the clamping tool can be released immediately after injection. The potting compound does not run off. The stacking of the reluctance rotor's sheet metal remains intact.

[0071] Before the adhesive mass is fed to the reluctance rotor via a pipe or hose and the distribution disc, its components are repositioned by relative movement from at least two separately present components so that a uniform and clearly defined distribution of the components to be mixed is available for further production and feeding into the flow barriers.

[0072] The mixing of at least two components can be done using a dynamic mixer, e.g. a speed mixer.

[0073] A technically simpler and more cost-effective option is the static mixing of the components.

[0074] The adhesive compound in the sheet metal package of the reluctance rotor is a two-component adhesive, in which thermally conductive additives and / or additives influencing the gel time of the adhesive compound are present in a predeterminable quantity.

[0075] A reactive adhesive based on epoxy / amine or, for example, [other materials] is preferably used as a two-component base material.

[0076] Polyurethane / isocyanate or methacrylate is used. Gelation at room temperature can be achieved within a few minutes to a few hours, so that the adhesive mass largely solidifies without additional heating (and the associated further liquefaction of the resin mixture). In other words, complete curing at room temperature without post-heating is possible.

[0077] Polysiloxanes and silicone are also suitable as base materials. The material, or rather the viscosity of the adhesive compound, recovers within a few minutes after the shear forces decrease (pressure decreases), resulting in self-hardening of the adhesive compound in the designated gaps and / or flow barriers, thus preventing flow paths through thin gaps, especially between the individual sheets of the reluctance rotor's sheet stack.

[0078] The adhesive cures without additional axial tension, therefore the potting compound / adhesive is not pre-stressed along the flow barriers or gaps and cannot crack later.

[0079] The volume shrinkage of such a filled reluctance rotor is less than 1%. This prevents, among other things, the formation of voids that could impair the strength of the reluctance rotor during further processing and operation, as well as its electromagnetic and thermal conductivity properties.

[0080] The adhesive compound, which preferably cures at room temperature, can be made thermally conductive (>0.5 W / mK) by means of suitable additives, in addition to exhibiting strongly thixotropic rheological behavior. These additives are mixed in before the compound is fed into the flux barriers of the reluctance rotor, in particular the distribution disc of the potting compound. This leads, among other things, to improved heat dissipation from the rotor laminations during operation of the dynamo-electric machine, as these are subjected to eddy currents and / or

[0081] Air gap harmonics can be heated.

[0082] The thermal conductivity of the potting compound can be adjusted by adding or mixing in various fillers. The additives used include quartz flour, quartz aggregate,

[0083] Boron nitride (BN), Alox, chalk. The individual components can be mixed together or separately and can thus make up to 40 vol.% of the total potting compound. The inventive method for manufacturing a rotor of a reluctance synchronous machine offers the following advantages:

[0084] The process is simpler and more cost-effective than previously known methods, in which the distribution discs are made of aluminum and are fixed to the shaft with a press fit.

[0085] After hardening, the rotor package is stabilized to such an extent that the outer surface of the rotor package can be turned to the air gap dimension without any displacement of the rotor laminations.

[0086] In this process, the outer webs of the rotor laminations of the laminated core are completely removed, leaving the flux barriers metallically open to the outside. The adhesive properties of the filler material are designed to withstand the centrifugal forces during this and subsequent processing, as well as the cutting forces.

[0087] After the rotor assembly has been over-rotated, the trickling process can begin. Resin or a resin-hardener system is trickled onto the turned outer surface.

[0088] A bandage (preferably glass or carbon fiber) is applied before, parallel to, or after the distribution disc. The bandage can begin on the outer diameter of the distribution disc. A suitable geometry for attaching the fiber can be provided on the distribution disc. The bandage is positioned at a specific pitch under pre-tension on the outer circumference.

[0089] The edge webs and, optionally, the center webs of the individual rotor laminations have the following functions during the manufacturing and operation of the reluctance motor. The edge webs are necessary for holding the axially stacked rotor laminations together on the drive shaft during the stamping of the rotor laminations and for stabilizing the rotor assembly during rotor over-turning to create the air gap. The center webs—if present—provide resistance against centrifugal forces during operation of the reluctance motor.

[0090] The distribution disc thus has one or more of the following functions: stacking the laminated core of the reluctance rotor on the shaft, distributing the adhesive compound, contributing to the cooling of the dynamo-electric machine, and balancing the reluctance rotor.

[0091] The adhesive function of the adhesive material used is designed to withstand the centrifugal forces during processing as well as the cutting forces.

[0092] After hardening, the rotor assembly is stabilized by this adhesive mass and can be turned down to the air gap dimension on the outside.

[0093] Additional shrunk-on discs for axially clamping the rotor lamination stack, as are generally used in reluctance rotors, are no longer needed with this technique, since the compaction takes place during the bonding process.

[0094] In addition to increasing the efficiency of the reluctance motor, this results in an increase in rotational speed to > 100 m / s peripheral speed.

[0095] The distribution disc can also be used for balancing, particularly after the reluctance rotor has been completed. This can be achieved, for example, by equipping it with pins for attaching balancing weights or by negative balancing through the removal of material from the distribution disc. Similarly, contours can be present on the distribution disc to allow for the introduction of balancing material.

[0096] Additional shrunk-on discs for axially clamping the rotor assembly, as generally used in reluctance rotors, are used in this

[0097] The manufacturing process is no longer required according to the invention. Only the distribution discs remain – as a “lost component”, so to speak – on the end faces of the reluctance rotor's lamination stack.

[0098] The reluctance rotor thus exhibits the following characteristics, which contribute to an increase in the reluctance motor's speed capability. The rotor laminations of the reluctance rotor have no outer or edge webs. The dimensions of the central webs can also be reduced or even omitted. Consequently, the rotor lamination stack no longer features complex structures in the individual laminations or interlocking connections, resulting in a reluctance motor of maximum efficiency. This is achieved, among other things, by using a simple bonding system to stabilize the rotor laminations and the entire rotor lamination stack during machining. A further increase in speed can be achieved through the addition of a bandage.

[0099] A thixotropic 2-component epoxy resin with a viscosity in the range of 150,000 - 500,000 mPa*s is preferably used as the potting compound or adhesive for the process to bond the sheets and fill the flux barriers.

[0100] The rotor's laminated core or partial laminated cores are preferably shrunk onto the shaft in a rotationally fixed manner or cold pressed on.

[0101] The rotor's laminated core can also be cold-joined to achieve the required torque resistance and axial strength of the core on the shaft. This reduces the axial joining forces.

[0102] Torque resistance of the laminated core on the shaft is also achieved by using lamination tongues in threading grooves, which are arranged on the inner diameter of at least some rotor laminations and project into the shaft bore. These lamination tongues in the threading grooves are already produced during the stamping of the individual laminations, so that no additional manufacturing effort is necessary.

[0103] In one embodiment, the threading grooves, and thus the sheet metal tabs and the spacer recess of a rotor lamination, can be positioned offset by 180° on the inner diameter of the rotor laminations by a punching process. This results in a lamination stack that, when the rotor laminations are arranged with a predefinable rotation angle of 90° between the threading grooves and the spacer recess, allowing a sheet metal tab to project into a spacer recess, providing an axial clearance of at least one sheet thickness in front of and behind each sheet metal tab. This allows for a slight, springy axial deformation of the sheet metal tab. When the lamination stack is joined to a shaft, the sheet metal tab(s) of one lamination deflect axially into this spacer recess of the adjacent lamination.

[0104] In the direction of rotation, this sheet metal tongue now exhibits a higher stiffness. During the axial joining of the rotor's laminated core, these sheet metal tongues rub against the machined surface along the shaft. This creates a slight positive fit with the shaft during the joining process, across the width of the sheet metal tongues. The axial joining force component of the sheet metal tongues is comparatively low, as they can bend easily. However, the sum of these positive fits results in a comparatively high torsional rigidity of the entire laminated core on the shaft.

[0105] The spring action achieved by the sheet metal tongues reliably compensates for expansions of the shaft bore caused by heating during operation or centrifugal forces, without compromising positioning, especially torsional stability.

[0106] An axial interlocking of the lamination tongues thus also provides axial security against slippage of the lamination stack on the shaft. The manufacturing joining method can also be applied to the typically angled lamination stacks of the reluctance rotor without additional machining.

[0107] In order to achieve sufficient torque strength, the required torque strength is achieved through additional small positive locking mechanisms between the individual rotor laminations of the reluctance rotor and the shaft.

[0108] Likewise, other possibilities exist to transfer the torque from the lamination stack to the shaft, such as keyways, etc.

[0109] The inventive method for manufacturing a rotor of a reluctance synchronous machine provides a reliable method for axially sealing the distribution disk to the end face of the lamination stack, since the axial clamping force required in this respect can be adjusted during injection molding with a clamping force via a corresponding tool.

[0110] This allows for comparatively high working pressures of the potting compound for injection via the distribution disc, which are in the range of 2-10 bar, preferably 4 bar, and thus prevent, among other things, the formation of voids.

[0111] The individual process steps, which take place at ambient temperature, eliminate unnecessary setup times, such as cleaning the clamping tools. This allows for comparatively short process times in the production of a reluctance rotor and, consequently, also in a dynamo-electric machine.

[0112] A reluctance synchronous machine equipped with such a reluctance rotor exhibits a high efficiency class and is therefore, also due to its improved speed capability, particularly suitable for driving compressors, compressors, conveyor belts, fans, etc., especially for continuous operation. The invention and further advantageous embodiments of the invention are explained in more detail with reference to exemplary embodiments, in which:

[0113] FIG 1 Principal longitudinal section of a reluctance synchronous motor,

[0114] FIGS. 2 to 7 Manufacturing stages of a reluctance rotor,

[0115] FIG 8 to 13 Threading grooves and some developments thereof.

[0116] It should be noted that terms such as "axial," "radial," "tangential," etc., refer to the axis 9 used in the respective figure or example described. In other words, the directions axial, radial, and tangential always refer to an axis 9 of the rotor 3 and thus to the corresponding axis of symmetry of the stator 2. "Axial" describes a direction parallel to the axis 9, "radial" describes a direction orthogonal to the axis 9, either towards or away from it, and "tangential" is a direction that is circular around the axis 9 at a constant radial distance and with a constant axial position. The expression "circumferential" is synonymous with "tangential."

[0117] With regard 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.

[0118] The term "coaxial components," e.g., coaxial components such as reluctance rotor 3 and stator 2, refers here to components that have the same normal vectors, meaning that the planes defined by the coaxial components are parallel to each other. Furthermore, the term implies that the centers of coaxial components lie on the same axis of rotation or symmetry. However, these centers may be located at different axial positions on this axis, and the planes may therefore have a distance greater than zero from each other. The term does not necessarily require that coaxial components have the same radius.

[0119] The term "complementary," in the context of two components that are "complementary" to each other, means that their external forms 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 ideally touch without gaps or across their entire surface. Consequently, in the case of two complementary objects, the external form of one object is determined by the external form of the other. The term "complementary" could be replaced by the term "inverse."

[0120] For the sake of clarity, in some cases where components are present multiple times, not all components shown in the figures are provided with reference symbols.

[0121] The same reference symbols have the same meaning in the figures.

[0122] The descriptions in the general section as well as in the specific figure descriptions can be combined as desired. Likewise, the individual features of the respective embodiments mentioned therein can also be combined without altering the essence of the invention.

[0123] FIG. 1 shows a longitudinal view of a dynamoelectric machine 1, in this case a reluctance synchronous machine. This synchronous machine has a stator 2 which has a winding system 4 in slots (not shown) that forms a winding head at the end faces of the stator 2. Through electromagnetic interaction across an air gap 21, a reluctance rotor 3 is set into rotation about an axis 9 by an energized winding system 4. The reluctance rotor 3 is arranged coaxially with the stator 2. The laminations 10 of the reluctance rotor 3 are stacked as a laminated core and connected to a shaft 5 in a rotational manner.

[0124] In these reluctance machines 1, an alternating magnetic field is generated by the stator 2, which drives the reluctance rotor 3 primarily due to the reluctance force. Both the reluctance rotor 3 and the stator 2 typically have laminated cores made of axially stacked laminations, which are preferably insulated from each other by single-sided lacquer coatings. The laminations are made of material with high magnetic permeability, e.g.

[0125] Electrical steel sheet. Each rotor lamination 10 of the reluctance rotor 3 is internally structured and has a number of cutouts that serve to influence the direction of the magnetic field. The cutouts are referred to as non-flux-carrying or non-magnetic-flux-conducting areas (flux barrier 14), while the rotor laminations 10 represent flux-carrying or magnetic-flux-conducting areas (flux-conducting areas 13).

[0126] The flux guide areas 13 are separated from each other by non-magnetic areas (flux barriers 14), which in the embodiment shown in FIG. 2 are predominantly arc-shaped recesses, formed in particular by a machining process such as punching. In reluctance technology, the magnetic flux is guided directly into the reluctance rotor 3 via the air gap 21 without damping of the stator 2.

[0127] Reluctance rotors 3 are fundamentally designed with magnetic flux guides 13 and flux barriers 14. This achieves the necessary inductance differences within the reluctance rotor 3 to obtain a corresponding torque output from a synchronous reluctance machine 1. These alternating magnetic preferred directions (d-axis 11) and directions exhibiting high magnetic resistance (q-axis 12) when viewed circumferentially thus form the magnetic d- and q-axes 11, 12 of the reluctance rotor 3.

[0128] Cutouts in the individual rotor laminations 10, packaged in a lamination stack, form the flux barriers 14 which run essentially axially. The flux barriers 14 of the lamination stack of the reluctance rotor 3 run either parallel to the axis, inclined or staggered.

[0129] In an axially parallel arrangement, the flux barriers 14 are aligned. In an inclined arrangement, each rotor lamination 10 is arranged circumferentially offset by a predefinable angle relative to the axially following rotor lamination 10. A lamination stack formed from axially arranged partial lamination stacks, the partial lamination stacks of which are arranged circumferentially offset by a predefinable angle, forms a staggered lamination stack 3.

[0130] The laminated core of the reluctance rotor is preferably shrunk or cold pressed onto the shaft 5 for torque transmission.

[0131] Likewise, other options exist for transferring the torque from the laminated core to shaft 5, such as keyway connections, etc. Laminated cores can also be assembled using axially parallel tie rod connections.

[0132] A torque strength of the laminated core on the shaft 5 can also be achieved by attaching lamination tongues 30 to threading grooves 31, which are arranged on the inner diameter of at least individual rotor laminations 10 and project into the shaft bore 34.

[0133] Ideally, these protrude approximately 0.2 to 0.3 mm into the shaft bore 34. The inner radius R1 of the rotor lamination 10 is always larger than the radius R2 of the lamination tongues 30. Depending on the shaft height of the dynamo-electric machine 1, these values ​​can also be exceeded or fallen short of.

[0134] These sheet metal tongues 30 in the threading grooves 31 are already produced during the stamping of the rotor laminations 10, so that no additional manufacturing effort is necessary.

[0135] FIG. 7 shows a rotor sheet 10 according to FIG. 2, with opposing threading grooves 31. These threading grooves 31 lie on the d-axis 11. Both the number of these threading grooves 31 of a rotor sheet 10, as well as their distribution and / or positioning on the inner diameter can vary.

[0136] FIG 8 shows an exemplary detail view of a rotor lamination 10, which is positioned on the shaft 5 and in which a lamination tongue 30 of the threading groove 31 engages in the shaft 5 and thus contributes to the reduction of roughness in the area of ​​axial joining of the lamination tongues 30 on the shaft 5.

[0137] In a further detailed view in a partial longitudinal section according to FIG. 9, the axial sequence of the rotor plates 10 on the shaft 5 is now shown. The sheet metal tabs 30 are bent at their ends 32 and have thus contributed to the reduction of roughness. The sheet metal tabs 30 of the threading grooves 31 deflect, axially viewed, into the space 33 of the adjacent rotor plate 10.

[0138] After the joining process of the lamination stack or the individual rotor laminations 10 onto the shaft 5, form-fitting grooves on the outer diameter of the shaft 5 must now be fixed.

[0139] FIG. 10 shows a sheet metal tongue 30 of a threading groove 31, which has a trapezoidal shape. This results in a greater axial restoring force at the end 32 of the sheet metal tongue 30 compared to the sheet metal tongue 30 with parallel flanks – according to FIG. 11. This improves the torque transmission of the laminated core to the shaft 5. In principle, other shapes of the sheet metal tongues 30 are also possible in order to obtain a lower or higher axial restoring force at the ends 32 of the sheet metal tongues 30, depending on requirements. The restoring force is thus influenced by the difference between the radii R1 (inner radius of rotor lamination 10) and R2 (radius of the sheet metal tongues 30), as well as by the material of the rotor laminations 10, the shape of the sheet metal tongues 30, and the number of threading grooves 31 on the inner diameter of a rotor lamination 10.

[0140] FIG. 13 shows another threading groove 31. This threading groove 31 is preferably formed on the inner diameter of the rotor lamination 10 by two pitch circles with a radius R3, which, from a predefinable transition point 35 onwards, each transition into a straight line, thus forming the lamination tongue 30, which forms an angle y with the straight lines. By selecting the transition points 35 on the pitch circles with radius R3, the angle y, and thus also the bending stiffness of the lamination tongue 30, can be adjusted.

[0141] The radius R4 of the end 32 of the sheet metal tongue 30 can also be used to influence, among other things, the formation of grooves on the shaft 5 during the axial joining of the rotor laminations 10.

[0142] In one possible embodiment, the threading grooves 31, and thus the sheet metal tongues 30 and the intermediate recess 33 of a rotor lamination 10, can be positioned offset by 180° on the inner diameter of the rotor laminations 10 by a punching process. This results in a lamination stack that, when the rotor laminations 10 are axially aligned on the shaft 5 with a predefinable rotation angle of 90° between the threading grooves 31 and the intermediate recess 33, allowing a sheet metal tongue 30 to project into a space within the intermediate recess 33, provides an axial clearance of one sheet thickness both before and after each sheet metal tongue 30. This allows for a slight spring-like axial deformation of the sheet metal tongue 30. When the rotor sheets 10 are joined to the shaft 5, the sheet metal tongue 30 or sheet metal tongues 30 of a rotor sheet 10 deflect axially into this intermediate recess 33 of the adjacent rotor sheet 10.In the direction of rotation, this sheet metal tongue 30 now exhibits a higher stiffness. During the axial joining of the lamination stack or the individual rotor laminations 10 of the reluctance rotor 3, these sheet metal tongues 30 rub against the machined surface of the shaft 5 along its length. This creates a slight positive fit across the width of the sheet metal tongues 30, particularly at their ends 32, with the shaft 5 during the joining process. The axial joining force component of the sheet metal tongues 30 is comparatively low relative to the predominantly cylindrical housing, as they can bend easily. However, the sum of the positive fits results in a comparatively high torsional rigidity of the entire lamination stack on the shaft 5.

[0143] The spring action of the lamination stack achieved by the lamination tongues 30 reliably compensates for expansions of the shaft bore due to heating during further manufacturing and operation of the reluctance machine 1 or centrifugal force stresses, without compromising the positioning and torsional stability of the individual rotor laminations 10 or the lamination stack.

[0144] The axial interlocking of the lamination tongues 30 on the shaft 5 thus also provides axial security against slippage of the lamination stack on the shaft 5. The manufacturing joining method can also be applied to the typically angled lamination stacks of the reluctance rotor 3 without additional machining.

[0145] In order to achieve sufficient torque strength, the required torque strength is achieved by additional small positive locking connections between the individual rotor laminations 10 of the reluctance rotor 3 and the shaft 5.

[0146] After pressing and stacking the rotor laminations 10 onto the shaft 5, the pressed lamination stack of the reluctance rotor 3 is formed. The individual rotor laminations 10 have a circumferential outer ring. In other words, the flux barriers 14 still have the edge webs 16 on their radial edges. Then, at least one distribution disk 20 is placed and positioned on the end faces of the lamination stack 6, as can be seen in FIG. 3.

[0147] Under axial tension of the lamination stack, an adhesive 19 is injected via the distribution disc 20 so that at least the flux barriers 14 are filled with adhesive. Preferably a two-component adhesive is used.

[0148] The distribution disc 20 can optionally also be used for balancing the reluctance rotor 3, for example by being equipped with pins for mounting balancing discs. Negative balancing can also be performed by drilling away predefined material accumulations. Alternatively, the distribution disc 20 can also have contours for inserting balancing weights.

[0149] The distribution disc 20, which forms the basis of the manufacturing process of a reluctance rotor 3 according to the invention and is attached at least to one end face of the lamination stack of the reluctance rotor 3, is positioned and fixed on the end face(s) of the lamination stack of the reluctance rotor 3 via positioning elements of the distribution disc 20.

[0150] This avoids axial support of the distribution disc 20 on the shaft 5, which further simplifies the positioning of the distribution disc 20.

[0151] The distribution disc 20 is fixed to the front face by means of positioning elements, which are designed, for example, in the form of pins or dowels and are formed in one piece with the distribution disc 20.

[0152] The distribution disc 20 is axially fixed to the end face of the lamination stack of the reluctance rotor 3 by means of its positioning elements prior to the casting process. This is achieved by anchoring the positioning elements in existing, corresponding openings in the lamination stack, such as recesses, inertia recesses, flow barriers 14, etc., in particular by means of a force-fit connection. The "resistance force" of the positioning elements, or the length of the pins or dowels with their clamping function, must therefore be dimensioned such that it is at least equal to, but preferably higher than, the axial repulsion forces occurring during the manufacturing process, so that the distribution disc 20 does not detach from the end face of the lamination stack during the casting process and continues to maintain its axial positive fit.

[0153] According to the invention, the cast-on pins are therefore designed with a slight excess relative to the corresponding openings of the sheet metal stack, ideally with a cross contour.

[0154] Alternatively, a spreading shape for the positioning elements, similar to a dowel, is also conceivable.

[0155] These positioning elements enable coaxial clamping or clawing of the distribution disc 20 on the front face of the sheet metal stack.

[0156] This distribution disc 20 is fitted form-fittingly to the front of the sheet metal package and can optionally also be used afterwards for balancing the reluctance rotor 3.

[0157] The distribution disk 20 has at least one circumferential distribution channel on the side facing the laminated core of the rotor, open towards the laminated core, in particular towards the poles of the reluctance rotor 3.

[0158] On the side of the distribution disc 20 facing away from the lamination stack, at least one injection opening is provided for a supply, in particular a pressurised supply, of an adhesive in order to fill the distribution channel with an adhesive mass 19 and thus the lamination stack of the reluctance rotor 3.

[0159] Optionally, the distribution channel – viewed in its entirety – has extensions in the area of ​​at least one – especially a large-volume – flux barrier 14 of a pole of the reluctance rotor 3, in order to provide sufficient potting compound 19 for the respective magnetic pole or its flux barriers 14.

[0160] The distribution channel and, optionally, its extension, form a tight, form-fitting seal with the end face of the lamination stack to generate the necessary pressure and thus the required shear forces in the adhesive compound 19 during the casting process. The circumferential distribution channel supplies the magnetic pole flux barriers 14 with the adhesive 19.

[0161] The distribution disc 20 can therefore have one or more circumferential distribution channels and / or junction openings in order to achieve the fastest possible filling of the sheet metal stack or at least its flow barriers 14.

[0162] The distribution channel can be circular in its entirety. It is also possible to design the distribution channel with radially and / or axially extending enlargements and / or a corrugated shape to achieve a sufficient fill level in the flux barriers 14 as quickly as possible. The course of the distribution channel essentially follows the pole arrangement. This applies both to the coverage area of ​​the distribution disc 20 and to the coverage area of ​​the distribution channel at the end face of the laminated core.

[0163] The distribution disc 20 is optionally additionally equipped on the side of the distribution disc 20 facing away from the distribution channel with

[0164] equipped with fan blades to generate moving air in the motor compartment, especially the winding head compartment, during operation of the reluctance synchronous machine, thus improving the cooling of the reluctance rotor 3 and / or the winding head compartment at the front of the stator 2.

[0165] The distribution disc 20 is manufactured as an injection-molded part, a deep-drawn part, or using 3D printing. Preferably, the distribution disc 20 is made of plastic or non-magnetic metal. The positioning elements, such as pins or dowels, or, for example, the optional fan blades, together with balancing elements, form a single component with the distribution disc 20.

[0166] During the injection molding process of the recesses via the distribution disc, the rotor's sheet metal stack can be additionally axially clamped over these distribution discs using a tool to ensure a seal between the distribution disc and the sheet metal stack or between the individual sheets and each other in any case.

[0167] By using the distribution disc 20 and sealing the distribution channel open towards the front, an optionally additional clamping tool is protected from contamination and can therefore be used immediately afterwards for subsequent actions.

[0168] The clamping tool also serves to bundle the lamination stack of the reluctance rotor 3, especially during the injection process of the flow barriers 14. The bundling – i.e., an axial force acting on the lamination stack – is carried out via the distribution discs 20 and / or also via the “radial free space” between distribution disc 20 and shaft 5 via the clamping tool.

[0169] The distribution disc 20 can have elastic geometries in the direction of the sheet metal package, or alternatively sealing material, which improves axial sealing during clamping and during the casting process with adhesive.

[0170] Optionally, distribution discs 20 are positioned on both sides of the lamination stack of the reluctance rotor 3, i.e., on the end faces of the lamination stack, to improve the stacking of the laminations and / or to accelerate the filling process of the flow barriers 14. At least one distribution disc 20 is equipped with a feed opening, i.e., an adhesive supply opening. To ensure that both distribution discs 20 are identical, a supply bore can generally be provided, which is sealed by a casting skin. If necessary, this casting skin can be broken out of the distribution disc 20 before casting. This reduces the number of parts that need to be kept in stock.

[0171] This manufacturing process is also suitable for axially staggered lamination stacks of the rotor. The recesses of the individual poles have sufficient axial overlap to allow the adhesive to be conveyed to the opposite axial end of the lamination stack of a pole.

[0172] Flow barriers 14 axially following partial sheet metal stacks of a pole have sufficient overlap in their area to ensure proper filling. However, the entire sheet metal stack has – as already explained above – at least one distribution disc 20 on an end face.

[0173] With only one distribution disc 20, the recesses on the other end face of the sheet metal pack are closed, e.g. by an end disc, so that no adhesive mass 19 can escape and the thixotropic effect can occur.

[0174] Advantageously, the reluctance rotor 3 is supplied with adhesive compound 19 as an upward pouring process under increased pouring pressure. In particular, an upward pouring process allows for a simple, bubble-free application.

[0175] The filling process of the adhesive 19 occurs regardless of whether the poles of the reluctance rotor 3 are axially parallel, inclined, or staggered. The crucial factor is always that the adhesive mass 19 can penetrate axially through the flux barriers 14 of a pole and / or the aforementioned gaps and fill the flux barriers 14 of a pole.

[0176] The liquid adhesive 19 is preferably pressed or injected under pressure into the flux barriers 14 of the reluctance rotor 3 over the entire axial length and thus connects all rotor laminations 10 to form a rigid and stiff rotor lamination package.

[0177] Regardless of the design of the rotor lamination stack (straight, inclined, staggered), the adhesive 19 or a resin always penetrates axially through the flux barriers 14 and can optionally even capillarize radially between the rotor laminations 10.

[0178] Crucially, especially for the subsequent process steps in the manufacture of the reluctance rotor 3, a rigid composite of the rotor laminations 10 is created.

[0179] The rotor plate 10 of this reluctance rotor 3 is characterized by the fact that, in the finished state of the reluctance rotor 3, at least some, preferably all, flux barriers 14 are open towards the circumference of the respective rotor plate 10, so that both ends of the flux barriers 14 open into the outer circumference. The rotor plates 10 therefore do not have a conventional closed magnetically conductive outer ring or edge webs 16. The outer circumference of the reluctance rotor 3 has only a bandage 18, as will be described in more detail later.

[0180] This is achieved in manufacturing by initially having the rotor laminations 10 have a conventional outer ring or edge webs 16, which is then removed in a subsequent machining step, e.g., by turning. Furthermore, there are no radial center webs between the radially arranged flux guide areas 13 of a pole, so that the flux barriers 14 are continuous from one (turned) open end to the other (turned) open end.

[0181] Despite the missing – i.e., turned – edge webs 16, a stable bond between the rotor laminations 10 is achieved by pressing the stacked rotor laminations 10 together during assembly of the reluctance rotor 3 and injecting a liquid material, e.g., liquid adhesive 19, into the flux barriers 14 under axial pressure. As the adhesive 19 hardens, a rigid body is formed in which the individual rotor laminations 10 can no longer shift and thus retain their relative positions even after turning.

[0182] After the rotor lamination stack has been turned, in which – as described above – the edge webs 16 of the flux barriers 14 are removed so that the flux barriers 14 of one pole are ideally open from one end to the other, a trickling process begins in which a resin or a resin-hardener system is applied to the turned outer surface of the rotor lamination stack. This trickling preferably takes place under uniform rotation of the rotor lamination stack.

[0183] Prior to this, a glass or carbon fiber bandage can be wound onto the turned rotor lamination stack under a predetermined pretension.

[0184] Applying the bandage can also take place during or after the dripping.

[0185] Advantageously, the distribution disc 20 offers geometries for attaching this bandage 18 both at the end and at the beginning of the bandage 18. However, this requires that corresponding distribution discs 20 are provided at both ends of the rotor lamination stack.

[0186] FIGS. 2, 4, and 5 each show a cross-section of a four-pole reluctance rotor 3 with exemplary flux barriers 14. Between the flux barriers 14 are arranged the magnetic flux guide sections 13, which contribute to the torque generation of the reluctance motor 1.

[0187] To improve stabilization, depending on the axis height of the reluctance machine 1, it may also be necessary to retain (e.g., radially extending) central webs 17 between the flux-carrying areas of a pole. However, this leads to undesirable stray fluxes, which reduce the machine's effectiveness. In the illustrated embodiment, four flux barriers 14 per pole are shown in the radial direction; however, three, four, five, or more flux barriers 14 can also be provided in the radial direction.

[0188] The invention can also be used with two-, four- or more-pole reluctance rotors 4.

[0189] The manufacturing process according to the invention of a reluctance rotor 3 creates a reluctance synchronous machine with a comparatively high efficiency class, which, due to its improved speed capability, is particularly suitable for driving compressors, compressors, conveyor belts, fans, etc., especially for continuous operation.

[0190] The efficiency increase is achieved by allowing the rotor laminations 10 to be electromagnetically optimized, as, among other things, the outer ribs 16 are eliminated. Due to differing magnetization states, the outer rings of reluctance rotors in the prior art exhibit fluctuating saturation states, which in turn have an adverse effect on the operating behavior of the reluctance motor 1. The elimination of the outer rings or outer ribs 16 according to the invention thus improves the operating behavior of the reluctance motor 1.

Claims

Patent claims 1. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), - Manufacturing several rotor laminations (10) which are arranged axially along a rotational axis (9) on a shaft (5) one after the other to form a lamination stack of the reluctance rotor (3) and which, depending on the lamination cut, form two, four or more even-numbered poles, by separating flux guide areas (13) per rotor lamination (10) from each other by non-magnetic, arc-shaped flux barriers (14) and thus forming q-axes (12) and d-axes (11) of the reluctance rotor (3), wherein the rotor laminations are made in one piece and form an outer ring formed from webs, wherein, via a distribution disc (20) arranged at least on one end face of the lamination stack, the at least radially outer flux barriers (14) over the entire axial length of the reluctance rotor (3) are filled with a liquid adhesive (19) under axial tension of the lamination stack, so that the provided flux barriers (14) are filled with adhesive (19), - solidification of the adhesive-coated lamination stack, - Turning the hardened laminated core, removing the webs forming the outer ring so that the flux barriers (14) are metallically open to the outside and thereby the radially outer ends of the flux barriers (14) open into the outer circumference of the rotor laminations (10), - Drip resin or a resin-hardener system onto the turned outer surface of the reluctance rotor ( 3 ), - before, at the same time as or after this trickling process, a bandage is stretched onto the turned outer circumference of the reluctance rotor ( 3 ), characterized by that at least one distribution disc ( 20 ) is fixed to the front face of the sheet metal stack via positioning elements.

2. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to claim 1, characterized in that the filling of the flux barriers ( 14 ) with adhesive is carried out under a predeterminable pressure.

3. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to claim 1 or claim 2, characterized in that the bandage comprises glass or carbon fiber.

4. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to one of the preceding claims, characterized in that the bandage ( 18 ) has a beginning and an end, wherein at least the beginning of the bandage ( 18 ) is attached to the outer circumference of the distribution disk ( 20 ) in a tensile-resistant manner.

5. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to one of the preceding claims, characterized in that the bandage ( 18 ) is applied to the turned outer circumference with a predefinable slope and with a pretension.

6. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to one of the preceding claims, characterized in that a 2-component adhesive is preferably used as the adhesive ( 19 ).

7. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to one of the preceding claims, characterized in that the distribution disk ( 20 ) has possibilities on the end faces of the lamination stack of the reluctance rotor ( 3 ) to carry out balancing of the reluctance rotor ( 3 ).

8. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to claim 7, characterized in that the distribution disk ( 20 ) has pins for mounting balancing disks.

9. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to claim 7, characterized in that the distribution disk ( 20 ) enables negative balancing by removing material from the distribution disk ( 20 ).

10. Method for manufacturing a reluctance rotor ( 3 ) of a dynamoelectric machine ( 1 ), according to claim 7, characterized in that the distribution disk ( 20 ) has contours to apply and / or introduce balancing masses to the distribution disk ( 20 ).

11. Reluctance rotor, manufactured according to one of the preceding claims, wherein characterized in that the rotor lamination stack of the reluctance rotor ( 3 ) has a bandage and no edge webs ( 16 ), wherein the flux barriers ( 14 ) are electromagnetically open towards an air gap ( 21 ) of the reluctance motor ( 1 ).

12. Reluctance motor ( 1 ) with a reluctance rotor ( 3 ) according to claim 11, manufactured according to one of claims 1 to 10, characterized in that with high efficiency of the reluctance motor ( 1 ) a rotational speed of up to 100 m / s circumferential speed is possible.

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