Fixing permanent magnets of a rotor of a permanently excited dynamo-electric machine by means of a trickling process

Abstract

The invention relates to a method for fixing permanent magnets (9) in rotors (4) of permanently excited synchronous machines by means of a trickling process, the method comprising the following steps: - stacking (30), in particular punch stacking, a laminated core (6) of the rotor (4), - connecting the laminated core (6) to a shaft (8) for conjoint rotation, - axially inserting permanent magnets (15) into substantially axially extending openings (11) in the laminated core (6), and - using at least one axially movable nozzle to apply resin or hardener to at least the outer diameter of the laminated core (6) equipped with permanent magnets (15) whilst said laminated core is rotated about its axis (7), such that the resin or adhesive (47) spreads uniformly at least via the outer surface into adhesive gaps (18, 20) between the permanent magnet (15) and the inside of the pocket (12), and between the laminations (5) in the radially outer region of the laminated core (6).

Description

[0001] 202401027

[0002] 1

[0003] Description

[0004] Fixation of permanent magnets of a rotor of a permanent magnet dynamoelectric machine by means of a trickling process

[0005] The invention relates to a method for fixing permanent magnets of a rotor of a permanent excitation dynamoelectric machine by means of a trickling process, a rotor produced therein, a permanent excitation dynamoelectric machine with such a rotor, as well as a use of a permanent excitation dynamoelectric machine.

[0006] Industrial low-voltage motors (<1 kV nominal voltage), especially those in efficiency classes IE4 and higher, are typically manufactured with permanent magnet rotors. The permanent magnets are inserted into designated pockets in the rotor's laminated core (so-called buried permanent magnets). To achieve this, the permanent magnets are placed into these pockets and then filled or bonded with adhesive. The geometric dimensions of these pockets are larger than those of the permanent magnets to allow for their axial insertion.

[0007] These pockets are designed to be 0.1–0.2 mm larger in size to facilitate insertion of the permanent magnet. Flux barriers are typically incorporated along the perimeter of the magnet pocket to positively influence the magnetic flux in the rotor lamination.

[0008] After the permanent magnets are inserted into the pockets, they must be mechanically fixed to the rotor's laminated core. This prevents any play in the permanent magnets within the pockets, which could cause a change in position due to mechanical stresses such as vibrations, centrifugal forces during operation of the permanent magnet dynamo-electric machine, or magnetic forces, among other factors.

[0009] The permanent magnets are typically glued into the pockets using a reactive plastic adhesive. Several commonly used methods exist for this. 202401027

[0010] 2

[0011] The magnetic pocket is pre-filled with adhesive. Then, the permanent magnet is inserted into the pocket. The permanent magnet displaces the adhesive into the glued gap and any empty spaces.

[0012] In another manufacturing process, the permanent magnet is first inserted into the magnetic pocket. Adhesive is then applied to the upper end face, which seeps into the adhesive gap after a certain time.

[0013] Disadvantages of these methods are that the adhesive also unintentionally capillaries between the metal sheets and, so to speak, sucks adhesive out of the adhesive gap, so that the bond between the permanent magnet and the magnetic pocket is insufficient.

[0014] The adhesive leaks uncontrollably into the gaps in the metal sheets or emerges from the outer diameter, contaminating the rotor surface and necessitating additional sealing. This also leads to increased rotor imbalance.

[0015] However, the individual metal sheets are not pressed tightly together, but each has a non-constant micro-gap that exhibits a high capillary action. This has an extremely detrimental effect on the bonding process, as the adhesive capillarizes from the adhesive gap into the spaces between the sheets during the bonding process, negatively impacting the bond due to insufficient adhesive in the gap between the magnet and the sheet.

[0016] To avoid the problem of adhesive being "siphoned off" from the adhesive gap through capillaries between the sheets, adhesive manufacturers recommend various methods, such as full potting under vacuum or "pre-treatment" of the pocket inner walls with an activator, to increase the reaction rate and reduce the capillary action of the adhesive into the spaces between the sheets.

[0017] However, these processes are very costly and, with comparatively long processing times, also technically very complex.

[0018] One possibility is to first introduce a pasty adhesive into the pocket, which is then displaced by the subsequently inserted permanent magnet in such a way that it conforms to the magnet. However, this insertion of the permanent magnets into the pasty material leads to a certain degree of positional inaccuracy, as the displaced paste does not conform evenly to the magnet and thus only forms a 202401027

[0019] Set up three spot bonding operations. Handling the magnetized permanent magnets is not trivial and, due to the magnetic forces, cannot be carried out properly in the desired manner. Furthermore, after each magnet insertion, the tool of an auxiliary device must be cleaned of the pre-applied adhesive paste.

[0020] Another way to fix the permanent magnets in the pocket is to subsequently encapsulate the pockets containing the permanent magnets with a reactive resin, which then needs to be cured by thermal treatment (using an oven, e.g., by exposure to a temperature of 140°C for 2 hours). Heating and cooling the entire rotor is a time-consuming and costly process step.

[0021] Furthermore, such temperatures during the exposure time can lead to partial demagnetization of the permanent magnets, which significantly impairs the performance of the permanent magnet dynamo-electric machine.

[0022] Furthermore, it is necessary to adequately seal the component beforehand to prevent the liquid reactive resin from escaping from the designated areas. This is necessary both at the end faces of the rotor lamination stack and on the outer surface of the rotor, as penetration of the individual laminations can occur in areas with thin walls (<1 mm) that are necessary for optimal magnetic flux, leading to contamination and dripping on the outer surface.

[0023] To prevent the need for time-consuming cleaning and reworking of these surfaces in a subsequent process step, the rotor's outer surface is sealed beforehand with a coating. This process also uses a high-temperature curing coating, resulting in an additional process step and another heating and cooling cycle.

[0024] When the rotor assembly is fully encapsulated with adhesive, press plates are attached to the rotor's end faces. These plates are made of aluminum and are press-fitted onto the shaft under axial tension of the rotor assembly. The application of the heated press plates under axial tension axially strengthens the rotor assembly. The clamping force is thus supported on the shaft. This requires a sophisticated fitting system, including the connection between the press plate and the shaft. 202401027

[0025] 4

[0026] Based on this, the invention aims to provide a method for fixing permanent magnets in the rotor of a permanent magnet dynamoelectric machine, the manufacture of which is comparatively simple and requires fewer complex process steps for fixing the permanent magnets in the rotor. The rotor produced in this way should achieve the required efficiency class for a permanent magnet dynamoelectric machine and thus deliver comparatively favorable energy consumption data for the applications of the permanent magnet dynamoelectric machine.

[0027] The solution to the given problem is achieved through the combination of features of the independent claims.

[0028] Advantageous embodiments of the invention can be found in the dependent claims.

[0029] According to the invention, a method for fixing permanent magnets in rotors of permanent magnet synchronous machines is employed by means of a trickle coating process, in which stamped individual laminations of the rotor are first stacked. Advantageously, the lamination stack of the rotor is stamped and stacked. This lamination stack is connected to a shaft in a rotationally fixed manner, such that substantially axially extending recesses are formed in the lamination stack into which permanent magnets can be inserted axially. The lamination stack of the rotor, equipped with permanent magnets, is then subjected to resin or hardener at least on its outer circumference while rotating about its axis by means of at least one axially movable trickle nozzle, so that the resin or adhesive is distributed evenly, at least over the outer surface, into adhesive gaps between the laminations in the radially outer region of the lamination stack as well as between the permanent magnet and the inside of the pocket.

[0030] The method for fixing permanent magnets in rotors of permanent excited synchronous machines is also suitable for rotors that are axially constructed using partial lamination stacks.

[0031] According to the invention, the negative effect of capillary action between the sheets, which is detrimental to conventional methods, is now used to fix the permanent magnets in the recesses or pockets, since the adhesive now flows from the outer diameter of the package at least to the surface of the permanent magnet and causes a bond between the outer wall of the pocket and the permanent magnet. 202401027

[0032] 5

[0033] Therefore, stamped rotor lamination stacks are very well suited for this process, as the generally existing micro gaps between the sheets (in the pm range) are well suited for the radially inward directed capillary effect or flow of the adhesive.

[0034] Capillary action between the sheets will also be possible in stacked packages of individual sheets, as well as in sheet package bundles glued together by individual adhesive points.

[0035] The permanent magnet is glued to the inner wall of the pocket - preferably the radially outer inner wall of the pocket.

[0036] According to the invention, it is proposed to apply a 1K or 2K resin hardener system to an entire rotor lamination stack with the inserted permanent magnets, which is already mounted on the shaft, by a trickle application process on the outer diameter.

[0037] Typically, the axial length of the lamination stacks or partial lamination stacks of the rotor corresponds to an integer multiple of the length of the permanent magnets in an axially extending recess.

[0038] The recesses in the rotor's lamination stack or partial lamination stack are cutouts in the laminations, which are arranged axially one behind the other to allow permanent magnets to be inserted axially. The recesses feature both pockets and flux barriers. The pockets are designed for the axial, in particular, reception of the permanent magnet(s).

[0039] Optionally, retaining elements, such as retaining lugs, protrude into the space of the recesses to provide additional fixation and support for the permanent magnets, at least during the manufacture and / or operation of the dynamoelectric machine, against centrifugal forces, among other things.

[0040] The design of the recess, including the limitation of the pocket by laterally arranged flux barriers via retaining elements or retaining lugs that preferably circumferentially define the radially outer inner wall of the pocket, ensures that the permanent magnet generally rests against the radially outer pocket wall. This offers the advantage of guaranteeing uniform adhesion of the permanent magnet to the inner wall of the pocket. 202401027

[0041] 6

[0042] The stacking factor, and thus the gap between the individual sheets, can be influenced by the axial stacking force (clamping force).

[0043] To further increase or accelerate the capillary action, the rotor's laminated core can be set into vibration during the trickling process.

[0044] Temperature control of the sheet metal stack and / or the adhesive also has a positive effect on the penetration of the adhesive into the gap, due to lower viscosity.

[0045] The resin or resin / hardener system should ideally have a relatively low viscosity, preferably below 100 mPa, in order to increase the capillary action between sheets and between the inner wall of the pocket and the corresponding side of the permanent magnet.

[0046] Penetration into the pocket occurs very quickly, especially at the narrow struts of the radially outer flux barriers, so that the application of adhesive to the radially outward-facing magnetic surfaces occurs relatively quickly.

[0047] With sufficiently long dripping, continued capillary action will also cause the permanent magnet to bond to the radially inner wall of the pocket. The necessity of bonding the permanent magnet on both sides depends on the motor's application and is particularly important when external vibrations are expected, such as in rail or ship traffic.

[0048] The advantage of this solution lies in the fact that the rotor, which is completely covered with permanent magnets, is glued in sections, at least at its poles. Therefore, there is no risk of insufficient wetting of the adhesive surface or the adhesive gap between the permanent magnet and the inner wall of the pocket.

[0049] During the dripping process, sufficient resin is available until the system is saturated. In other words, the system is saturated when capillary action in the gaps between the sheets ceases, as these gaps are filled.

[0050] Since the rotor laminations or partial lamination stacks are pressed onto the shaft before the bonding process, there is also no risk of cracking in the rotor assembly. 202401027

[0051] 7

[0052] Bonding with a resin system is also significantly cheaper. The rotor, and therefore the motor, has a high operating temperature capability. This temperature capability is approximately 160°C, exceeding the temperature resistance of typical high-performance magnets.

[0053] When using a 1-component resin system, curing at elevated temperature is required, whereas with a 2-component resin system, no additional thermal treatment is necessary with appropriate settings.

[0054] The sheets are additionally bonded together on the outside, which reduces vibrations of the individual sheets of the lamination stack during operation of the dynamo-electric machine.

[0055] Resin, hardener, or adhesive is applied to the outer diameter of the rotating rotor via an axially moving nozzle. The adhesive flows across the surface, capillaries into the laminated core, and penetrates at least as far as the surface of the permanent magnet.

[0056] The setting parameters of the trickling process (volume flow, temperature of rotor package or adhesive, rotor speed, axial nozzle path, time of exposure, viscosity of the adhesive) allow for targeted influence on the bonding and / or the penetration depth.

[0057] To also make the rotors suitable for high-speed applications of a dynamo-electric machine, a reinforcing fiber or a bandage can be additionally wound around the outer diameter of the rotor during the trickling process.

[0058] Preferably, this consists of one to approximately five layers of glass or carbon fiber wound at an oblique angle onto the outer circumference of the laminated core, with a maximum excess of approximately 0.5 times the radial air gap. The radial air gap is the distance between the rotor and stator.

[0059] For an accelerated trickle application process, or for larger lamination stacks, filler discs can be additionally attached to the end faces of the lamination stack. These discs accelerate the axial application of adhesive to the recesses, particularly through an "empty outer" flux barrier. This results in a capillary flow of the adhesive directly onto the magnetic surfaces of the permanent magnets.

[0060] These filler discs can be pressed into existing holes on the end face of the rotor's laminated core using attached plugs. This provides a hold for the 202401027.

[0061] 8

[0062] The manufacturing process involves dripping. Finally, these filler discs are additionally held in place by bonding. If required, these filler discs are coated on the inside with a layer that promotes sealing.

[0063] The filling disc can – insofar as it remains on the rotor – be additionally equipped with fan blades to create air circulation in the engine compartment during operation of the dynamo-electric machine, thereby increasing the efficiency of the dynamo-electric machine.

[0064] The method of using filler discs to achieve axial bonding of the permanent magnets to the inner wall of the pocket would also be suitable for fully bonded sheet metal stacks, such as a back-applied adhesive system, since radial penetration of the adhesive into the pockets by means of capillary action between the individual sheets is not possible there.

[0065] In another version, the rotor assembly is fitted with a filler disc only on one end face, while the opposite side has only a flat seal. To accelerate bonding, the rotor can be tilted or set into a wobbling motion during rotation.

[0066] The method according to the invention now has the following advantages:

[0067] This results in uniform fixation of the permanent magnets, allowing bonding across the entire rotor, thus eliminating the need for subsequent shrinkage processes as required by conventional methods. Furthermore, there is no risk of cracking at the bond line. It is a simple and cost-effective solution. The bond is suitable for higher temperatures up to 160°C and exhibits rapid curing.

[0068] The invention and further advantageous embodiments of the invention are explained in more detail with reference to exemplary embodiments shown in principle, in which:

[0069] FIG 1 shows a longitudinal section of a basic dynamo-electric machine,

[0070] FIG 2 shows a cross-section of a rotor equipped with permanent magnets,

[0071] FIG 3 shows a longitudinal section of a rotor equipped with permanent magnets, 202401027

[0072] 9

[0073] FIG 4 shows a cross-section of a rotor equipped with permanent magnets during the trickling process,

[0074] FIG 5 is a detail view of FIG 4,

[0075] FIG 6 shows a cross-section of a rotor equipped with permanent magnets during the trickling process with a bandage,

[0076] FIG 7 shows a cross-section of a rotor equipped with permanent magnets during the trickling process, showing the penetration depth.

[0077] FIG 8 shows a longitudinal section of a rotor equipped with permanent magnets during the trickling process with filling discs,

[0078] FIG 9 shows a longitudinal section of a rotor equipped with permanent magnets during the trickling process with a one-sided filling disc.

[0079] It should be noted that terms such as "axial," "radial," "tangential," etc., refer to the axis 7 used in the respective figure or in the described example. In other words, the directions axial, radial, and tangential always refer to an axis 7 of the rotor 5 and thus to the corresponding axis of symmetry of the stator 2. "Axial" describes a direction parallel to the axis 7, "radial" describes a direction orthogonal to the axis 7, either towards or away from it, and "tangential" is a direction that is circular around the axis 7 at a constant radial distance and with a constant axial position. The expression "circumferential" is synonymous with "tangential."

[0080] 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.

[0081] The term "coaxial components," e.g., coaxial components such as rotor 5 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 aforementioned planes may therefore have a distance >0 from each other.

[0082] 10. The expression does not necessarily require that coaxial components have the same radius.

[0083] 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 completely enclosed 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."

[0084] 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.

[0085] The described embodiments can be combined in any way desired. Likewise, individual features of the respective embodiments can also be combined without departing from the essence of the invention.

[0086] FIG. 1 shows a longitudinal view of a dynamoelectric machine 1, in this case a permanent magnet synchronous machine. This permanent magnet synchronous machine has a stator 2 with a winding system 3 in slots (not shown) that forms a winding head at the end faces of the stator 2. An energized winding system 3 causes a rotor 4 to rotate about an axis 7 through electromagnetic interaction across an air gap 26. The rotor 4, which is arranged coaxially with the stator 2, has permanent magnets 15 arranged in axially extending recesses 18, which are also referred to as buried permanent magnets 15. The laminations 5 of the rotor 4 are stacked as a laminated core 6 and are non-rotatably connected to a shaft 8.

[0087] FIG. 2 shows a cross-section of the rotor 4, equipped with permanent magnets 15, at the beginning of the trickling process, in which a trickling nozzle 16 applies the resin 17 to the surface of the laminated core 6 of the rotor 4. The recesses 11 of one pole are arranged in a V-shape, with inertial recesses 19 provided radially further inwards – towards axis 7. 202401027

[0088] 11

[0089] FIG 3 shows a longitudinal section of the rotor 4 equipped with permanent magnets 15, in which the axial movement of the trickling nozzle 16 and the rotation of the rotor 4 during the “loading” with resin or adhesive are shown in principle.

[0090] FIG. 4 shows a cross-section of the rotor 4 equipped with permanent magnets 15 during the dripping process. Capillary action is indicated by dashed lines. Depending on the viscosity of the adhesive 17 and the dwell time, a greater penetration depth 30 is achieved.

[0091] FIG. 5 shows a detail view of FIG. 4, showing that the capillary action allows the adhesive 17 to penetrate into the radial outer areas of the lamination stack 6 and into the recesses 11, in particular the flux barriers 14 and the gaps 21, 22 between the permanent magnet 15 and the inner wall of the pocket 28, 29. Due to the cavities in the region of a magnetic pole 32, the penetration depth there is somewhat greater than in the region of the pole gaps 33.

[0092] FIG 6 shows in cross-section the rotor 4 equipped with permanent magnets 15, which is provided with a bandage 23 in a predetermined number of layers, particularly during the trickling process.

[0093] FIG 7 shows a cross-section of the rotor 4 equipped with permanent magnets 15, showing the maximum penetration depth 30 into the laminated core 6 during the trickling process. The adhesive 17 then gels during this phase.

[0094] FIG 8 shows in a longitudinal section a rotor 4 equipped with permanent magnets 15, which can accelerate the trickling process with several trickling nozzles 16 and filling discs 24 during the trickling process.

[0095] FIG 9 shows a longitudinal section of the rotor 4 equipped with permanent magnets 15, which performs wobbling movements during the trickling process with a one-sided filling disc 24.

[0096] Such a permanent magnet synchronous machine with a rotor 4 according to the invention is preferably used in compressors, fans, and pumps. Likewise, such a permanent magnet synchronous machine can be used in transportation technology as a main drive and / or auxiliary drive in rail or ship transport. 202401027

[0097] 12

[0098] Reference symbol list

[0099] 1 dynamoelectric machine

[0100] 2 Stator

[0101] 3 winding head

[0102] 4 Rotor

[0103] 5 rotor plates

[0104] 6 sheet metal package

[0105] 7-axis

[0106] 8 wave

[0107] 11 exceptions

[0108] 12 bags

[0109] 14 River dam

[0110] 15 permanent magnet

[0111] 16 Drip nozzle

[0112] 17 glue

[0113] 18 Nozzle movement

[0114] 19 Inertial recess

[0115] 20 Capillating

[0116] 21 outer gap

[0117] 22 inner gap

[0118] 23 Bandage

[0119] 24 Filler disc

[0120] 25 sealing disc

[0121] 26 Movement Wave

[0122] 27 air gap

[0123] 28 radial outer pocket inner wall

[0124] 29 radial inner pocket inner wall

[0125] 30 penetration depth

[0126] 31 retaining elements

[0127] 32 magnetic pole

[0128] 33 pole gap

Claims

202401027 13 Patent claims 1. Method for fixing permanent magnets (9) in rotors (4) of permanent excited synchronous machines by means of a trickling process by the following steps: - Packing (30), in particular stamping a lamination stack (6) of the rotor (4), - Rotationally fixed connection of the lamination stack (6) to a shaft (8), - Axial insertion of permanent magnets (15) into substantially axially extending recesses (11) of the laminated core (6), - the laminated stack (6) equipped with permanent magnets (15) is subjected to resin or hardener at least on its outer diameter by means of at least one axially movable nozzle while rotating about its axis (7), so that the resin or adhesive (47) is distributed evenly at least over the outer surface in the adhesive gaps (18,20) between the permanent magnet (15) and the inside of the pocket (12), as well as between the sheets (5) in the radially outer area of ​​the laminated stack (6).

2. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines by means of a trickling process by the following steps: - Packaging (30), in particular stamping packaging of partial lamination packages (6) of the rotor (4), - Rotationally fixed connection of the partial sheet metal stack to an auxiliary shaft, - Axial insertion of permanent magnets (15) into substantially axially extending recesses (11) of the partial lamination stack, - Rotationally fixed connection of the individual partial lamination stacks on a shaft (8), by means of axial stacking to form a lamination stack (6), - the laminated stack (6) equipped with permanent magnets (15) is subjected to resin or hardener at least on its outer diameter by means of at least one axially movable drip nozzle (16) while rotating about its axis (7), so that the resin or adhesive (47) is distributed evenly at least over the outer surface in the adhesive gaps (18,20) between the permanent magnet (15) and the inside of the pocket (12), as well as between the sheets (5) in the radially outer area of ​​the partial laminated stack.

3. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to claim 1 or 2, characterized in that, following the trickling process, the laminated core (6) of the rotor (4) is subjected to a thermal process to accelerate hardening, the temperature of which is below the limit temperature of the permanent magnets (15). 202401027 14 4. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized in that during the trickling process a reinforced fiber or bandage (23) is wound on the outer circumference of the laminated core (6).

5. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to claim 4, characterized in that the fiber or bandage (23) has several bearings on the outer circumference of the rotor (4), preferably one to five bearings, but not more than 0.5 times the radial thickness of the air gap (26) between stator (2) and rotor (4).

6. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized in that the viscosity of the resin (17) is comparatively low and preferably in the range up to 100 mPaS.

7. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized in that the stacking of the laminations (5) of the lamination stack (6) and / or the partial lamination stacks is carried out by welding or bonding or stamping the respective laminations (5) or partial laminations.

8. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized in that the curing of the adhesive or resin (17) in the lamination stack (6) or partial lamination stack takes place in an oven following the trickling process or already during the gelling phase by means of heat radiation or induction heating.

9. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized in that the laminated core (6) or the partial laminated core is set into axial and / or circumferential vibrations during the trickling process in order to increase or accelerate the capillary action, in particular between the individual laminations (5).

10. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized by 202401027 Figure 15 shows that temperature control of the sheet metal stacks (6) and / or partial sheet metal stacks and / or the adhesive (17) is applied to optimize the bonding process, in particular 40-80°C at the sheet metal stack (6), preferably 60°C.

11. Method for fixing permanent magnets (15) in rotors (4) of permanent excited synchronous machines according to one of the preceding claims, characterized in that at least on one end face of the laminated core (6) filling discs (24) are provided which allow axial feeding with resin or adhesive (17) via the flux barriers (14) of the recesses (11).

12. Rotor (4) of a permanent excitation synchronous machine with buried permanent magnets (15) manufactured according to a method of claims 1 to 11, characterized in that the pockets (12) of the recesses (11), apart from the volume of the permanent magnets (15), are filled with adhesive (17) and a radially predetermined outer area of ​​the individual laminations (5) is bonded.

13. Permanent magnet synchronous machine with one rotor (4) according to claim 12.

14. Compressors, fans, pumps with a drive comprising at least one permanent magnet synchronous machine according to claim 13.

15. Main drive and / or auxiliary drive in rail or ship transport, comprising at least one permanent magnet synchronous machine according to claim 13.

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