Laminated core

Abstract

The invention relates to a method for producing a laminated core (3) comprising multiple individual sheets (4, 104). The individual sheets (4, 104) are bonded to each other by means of an anaerobic adhesive (105) such that at least one cooling channel (10A…17A, 10B…17B), preferably a coolant circulation system, is sealed in a media-tight manner.

Description

[0001] Description

[0002] Sheet metal package

[0003] In frameless engines, cooling pipes are usually used for the water cooling circuit. The thermal connection of the cooling pipes to the laminated core presents a significant challenge, as the cooling pipes require clearance for installation. This, however, results in them being surrounded by an insulating layer of air, making it difficult to dissipate heat from the laminated core. The cooling pipes are usually made of stainless steel or plastic.

[0004] The invention is based on the object of improving heat dissipation.

[0005] The object is achieved by claim 1, i.e. a method for producing a laminated core comprising a plurality of individual sheets, wherein the individual sheets are bonded to one another by an anaerobic adhesive in such a way that at least one cooling channel, preferably a cooling circuit system, is sealed in a media-tight manner.

[0006] This is advantageously achieved by flooding the cooling channel, preferably the cooling circuit system, with the adhesive.

[0007] The adhesive is, for example, an anaerobic-curing securing adhesive, which is preferably high-strength. In its liquid state, i.e., especially before curing, the adhesive advantageously exhibits the following physical properties:

[0008] Chemical characterization: Methacrylic acid ester Curing system: Anaerobic curing;

[0009] Viscosity at 25°C: between 50 and 60 mPa*s. Density at 25°C: approx. 1.05 g / cm3 At a temperature of approximately 23°C, the adhesive cures to such an extent that it is hand-tight after five to ten minutes and functional after approximately 30 to 40 minutes.

[0010] When cured, a temperature range of -60 °C to 180 °C is advantageous. A compressive shear strength according to DIN EN ISO 10123 is advantageously at least 28 N / mm 2 .

[0011] The adhesive cures quickly, which can also be accelerated with an activator. The adhesive is resistant to shear stress and dynamic loading.

[0012] Due to its very low viscosity, the adhesive has very good flow properties.

[0013] Preferably, a cooling circuit system has a plurality of cooling channels.

[0014] The adhesive penetrates advantageously, particularly through capillary action, into the spaces between two individual sheets and can cure there. The adhesive can also cure through the application of heat.

[0015] The adhesive is preferably low-viscosity.

[0016] Due to its low viscosity, the adhesive can penetrate and fill the smallest gaps, such as hairline cracks or microporosities, due to capillary action.

[0017] The problem is further solved by a laminated core comprising a plurality of bonded individual sheets such that at least one cooling channel, preferably a cooling circuit system, is sealed in a media-tight manner. The individual sheets are advantageously bonded using an anaerobic adhesive.

[0018] The object is also achieved by a dynamo-electric machine, wherein the machine can be cooled by flowing cooling liquid, for example water, through at least one cooling channel, comprising such a laminated core.

[0019] Oil or other liquids can also be used as cooling fluid.

[0020] The laminated core is sealed with the adhesive, which offers many advantages. These include the elimination of cooling tubes and the elimination of the assembly process. This also allows non-circular cooling channel structures to be used for water cooling (or other liquid cooling), e.g., cooling channels for forced ventilation.

[0021] The invention allows for an increase in the cooled surface area, thus achieving better cooling properties and lower engine temperatures. The engine can be more effectively utilized in terms of power and / or torque density.

[0022] In addition to the increase in surface area, the axial thermal conductivity of the laminated core is also advantageously increased, since fine air pockets / gaps between the individual sheets are now filled with adhesive.

[0023] A further advantage is the saving of installation space in the axial direction due to simpler deflection in the bearing shield.

[0024] The machine advantageously has at least one bearing plate, wherein the bearing plate has at least one channel designed to divert the cooling fluid. A particularly preferred embodiment is one in which two bearing plates are present (A-side and B-side).

[0025] In this way, a cooling circuit system can be created, as coolant can flow through the cooling channels, thus cooling the machine. The coolant can be redirected in the area of ​​the bearing shield and flow through another cooling channel.

[0026] This is advantageously achieved by the channel connecting at least two cooling channels with each other.

[0027] The machine is preferably caseless.

[0028] The machine advantageously has an inlet for the cooling liquid and an outlet.

[0029] The problem is also solved by a method for operating a dynamo-electric machine, wherein the machine is cooled by a cooling liquid, wherein the cooling liquid flows through cooling channels.

[0030] The cooling liquid is preferably diverted within and / or on at least one bearing shield.

[0031] The channel(s) for deflection can, for example, also be integrated into the laminated core.

[0032] Individual sheets are currently handled advantageously, i.e., aligned and clamped. Bonded-lacquer sheet stacks, on the other hand, are difficult to handle due to a complex manufacturing process, particularly due to clamping and baking devices. A further advantage of the method is that the material-to-material connection, advantageously adhesive bonding, allows for easier handling of the sheet stack in subsequent process steps, for example, when inserting a winding. The invention is described and explained in more detail below with reference to the exemplary embodiments shown in the figures.

[0033] It shows :

[0034] FIG 1 a laminated core,

[0035] FIG 2 and 3 possible bearing shield designs,

[0036] FIG 4 a dynamoelectric rotary machine with a rotor and a shaft as well as a

[0037] Stator,

[0038] FIG 5 a manufacturing process,

[0039] FIG 6 an operation of the machine,

[0040] FIG 7 a possible arrangement of cooling channels,

[0041] FIG 8 a sheet metal section,

[0042] FIG 9 a possible arrangement of cooling channels,

[0043] FIG 10 a sheet metal section,

[0044] FIG 11 a sheet metal section,

[0045] FIG 12 a possible arrangement of cooling channels,

[0046] FIG 13 a possible arrangement of cooling channels,

[0047] FIG 14 a sheet metal section and

[0048] FIG 15 a possible arrangement of cooling channels.

[0049] FIG 1 shows a laminated core 3. The laminated core 3 comprises a plurality of individual laminations 4. The individual laminations are bonded together.

[0050] The figure also shows an opening 5 for a rotor and teeth 6 .

[0051] In the figure, the laminated core has cooling channels 10A...17A and cooling channels 10B...17B .

[0052] It is possible to use a sheet metal section known from the prior art, which has openings for forced ventilation according to the prior art, see reference numerals 11A, 12A, 13A, and 14A. Furthermore, the sealing allows channels previously used for forced ventilation (see reference numerals 15A, 17A) to be used for water cooling or other cooling liquids.

[0053] Channels 10A, 11A, 12A, 13A, 14A, 16A and 10B, 11B, 12B, 13B, 14B, 16B in the prior art sheet metal section are used for forced ventilation, while channels 15A, 17A, 17B are used for water cooling. The invention advantageously allows all channels to be used for water cooling or another cooling liquid, e.g., oil.

[0054] The cooling channels are advantageously separated from each other.

[0055] By sealing the individual sheets to each other and to the environment, it is also possible to use an existing sheet metal cut.

[0056] Figures 2 and 3 show possible bearing shield designs. The bearing shield 20 in Figure 2 has channels 31A and 31B, which allow the cooling fluid to be redirected.

[0057] The bearing plate 21 in FIG. 3 has channels 40A and 40B, which allow for the redirection of cooling fluid. An opening 23 is also shown. The opening 23 preferably serves as a cable feedthrough from the winding to the terminal box.

[0058] FIG 4 shows a dynamoelectric rotary machine 100 with a rotor 101 and a shaft 103 as well as a stator 102.

[0059] The stator 102 has a plurality of individual sheets 104 which are connected to one another by means of an adhesive 105.

[0060] FIG 5 shows a manufacturing process.

[0061] In a method step S1, at least one cooling channel 10A...17A, 10B...17B, preferably the cooling circuit system, is flooded with the adhesive 105.

[0062] In a process step S2, the adhesive 105 penetrates, in particular by capillary action, into the spaces between two individual sheets 4, 104. In other words, this advantageously means: The cooling circuit is preferably flooded with the anaerobic adhesive, whereby the adhesive preferably diffuses between the individual sheets by capillary action.

[0063] In process step S3, curing occurs. This can be achieved at ambient temperature or with the application of heat.

[0064] FIG 6 shows an example of operation of the machine 100.

[0065] The machine is cooled by a cooling liquid in that in a process step S11 the cooling liquid flows through at least one cooling channel 10A..17A, 10B...17B.

[0066] In a method step S12, the cooling fluid is redirected within and / or on at least one bearing plate 20, 21. In a method step S13, the cooling fluid flows through another cooling channel.

[0067] The electrical sheets of the stator laminated core are advantageously bonded together using an anaerobic adhesive, preferably of low viscosity, thus creating a seal for the cooling circuit.

[0068] Due to the possibility of a media-tight laminated core, the redirection of the water cooling in the area of ​​the bearing plates or alternatively in the front area of ​​the laminated core can be solved very easily and in a space-saving manner by geometric milling.

[0069] An alternative to milling the front-side sheets is, for example, an additional punching in the front-side sheets.

[0070] The additional punchings to form deflection channels can also be made within the sheet stack, i.e. not on the front side.

[0071] The advantage here is that the sealing points to the bearing shield are eliminated and the cooling circuit can be implemented entirely in the laminated core.

[0072] FIG 7 shows a possible arrangement 700 of cooling channels formed by an exemplary sheet metal cut 800 in FIG 8, where several openings 8001, 8002, 8003 and 8004 are present.

[0073] The arrangement 700 shown in FIG 7 can be formed by twisting a package, preferably of several individual laminated cores.

[0074] The following relationships are advantageous: n = number of openings ß = angle of a cooling channel opening, Y = angle between the cooling channel openings,

[0075] Y = c • ß, where c = 1 / 5 to 1 / 2, preferably c = 1 / 3. ß = 360° / n • (1 + c) .

[0076] The illustrated arrangement 700 comprises 14 openings, resulting in ß of approximately 19.3°, as well as with ten openings in FIG 9 with ß = 27°.

[0077] FIG 7 shows a sheet metal section without stator teeth and stator slots, the focus here being on a representation of the arrangement of cooling channels.

[0078] FIG 9 shows a further arrangement 900, which can be formed in particular by means of sheet metal cuts, which are shown in FIG 10.

[0079] The sheet metal section 1000 in FIG 10 shows a plurality of openings, which are designated as 10001, 10002 and 1003 as an example.

[0080] The shapes of the cooling channels in the figures are exemplary; other shapes and forms are also possible. For example, the cooling channels can be round, elongated, elliptical, and / or polygonal, although this list is not exhaustive.

[0081] The process is also well suited to a laminated core constructed in this way with a plurality of such individual sheets.

[0082] A further advantageous embodiment is shown in FIG 11 with the sheet metal section 1100.

[0083] Such a lamination cut 1100 can create an asymmetric cooling channel structure in the lamination stack. The lamination cut 1100 is divided into four segments, with the two opposite segments being at least substantially identical in shape.

[0084] This applies, for example, to the elements 11001, 11002, and 11003 shown in FIG. 11, as well as to the opposite elements of the same size. This also applies, for example, to the elements 11004, 11005, and 11006 shown, as well as to the opposite elements of the same size.

[0085] Preferably, two opposite segments are designed in such a way that n cooling channels are arranged at an angle a over 90°. In contrast, n / 2 cooling channels are embossed in the other segments, with an angular offset of 2

[0086] • a is .

[0087] During production, the laminated core is preferably twisted at 90° (for example), although other angles are also possible. This preferably averages out mechanical tolerances and magnetic anisotropies.

[0088] In combination with the arrangement of the cooling channels described above, the result in the laminated core is not a straight-line cooling channel, but a cooling channel with a grid structure, which causes turbulence in the cooling medium and thus enables increased heat transfer.

[0089] The laminated core is designated 1200 in FIG. 12. This indicates a possible twisting of individual cores.

[0090] FIG 13 also shows this from a different perspective (see reference numeral 1300).

[0091] The combination of a media-tight laminated core with an arrangement described above enables, for example, in addition to the advantages of a media-tight laminated core, which lies in a more direct heat transfer from the laminated core to the cooling medium, no or hardly any contact resistance and an overall more efficient and better cooling, the following further advantages:

[0092] - Formation of turbulence in the cooling medium instead of purely laminar flow and thus increased heat transfer coefficients and improved cooling effect.

[0093] Alternatively, the cooling channels in the respective segments can also be formed with n-1 cooling channels. In this case, the same or at least a similar angular offset a is preferably achieved.

[0094] As in the previously described variant, an opening angle ß2 is preferably designed to be greater than ß1 (see FIG. 14) in order to enable the cooling channels to overlap. In addition, the cooling channels are shifted by the angle y2 to enable the cooling channels to overlap; preferably, y2 is greater than yl.

[0095] Such a design of a sheet metal section with the individual angles 14000 is shown in FIG. 14. The openings 14001 to 14011 designed for flow are also shown there.

[0096] FIG 15 shows an example of a plurality of laminated cores which are arranged twisted relative to one another.

Claims

Patent claims 1. Method for producing a laminated core (3) comprising a plurality of individual sheets (4, 104), wherein the individual sheets (4, 104) are materially bonded to one another by an anaerobic adhesive (105) such that at least one cooling channel (10A...17A, 10B...17B), preferably a cooling circuit system, is sealed in a media-tight manner.

2. Method according to claim 1, wherein the cooling channel (10A..17A, 10B...17B), preferably the cooling circuit system, is flooded with the adhesive (105).

3. Method according to one of the preceding claims, wherein the adhesive (105), in particular by means of capillary action, enters the spaces between two individual sheets (4, 104) and is cured.

4. A method according to any one of the preceding claims, wherein the adhesive is of low viscosity.

5. Laminated core (3), in particular produced by a method according to one of claims 1 to 4, comprising a plurality of materially bonded individual sheets (4, 104) such that at least one cooling channel (10A..17A, 10B...17B), preferably a cooling circuit system, is sealed in a media-tight manner.

6. Laminated sheet package (3) according to claim 5, wherein the individual sheets (4, 104) are connected by means of an anaerobic adhesive (105).

7. Dynamoelectric machine (100), wherein the machine (100) can be cooled by flowing cooling liquid, for example water and / or oil, through at least one cooling channel (10A..17A, 10B...17B), comprising a laminated core (3) according to one of claims 1 to 6.

8. Dynamoelectric machine (100) according to claim 7, comprising at least one bearing plate (20, 21), wherein the bearing plate (20, 21) has at least one channel (31A, 31B, 40A, 40B) designed to deflect the cooling liquid.

9. Dynamoelectric machine (100) according to claim 8, wherein the channel (31A, 31B, 40A, 40B) connects at least two cooling channels (10A..17A, 10B...17B) to each other.

10. Dynamoelectric machine (100) according to one of claims 8 or 9, wherein the machine (100) is housingless.

11. A method for operating a dynamoelectric machine (100) according to one of claims 7 to 10, wherein the machine is cooled by a cooling liquid, wherein cooling channels (10A..17A, 10B...17B) are flowed through by the cooling liquid.

12. A method of operation according to claim 11, wherein the cooling liquid is diverted within and / or on at least one bearing plate (20, 21).

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