Laminated stator core

Abstract

The invention relates to a laminated stator core (1) for a dynamoelectric machine (100), comprising at least one cooling channel (30, 31, 32, 33), at least one flow-influencing element (21a, 21b, 21c, 21d) being arranged in the cooling channel (30, 31, 32, 33).

Description

[0001] Description

[0002] Stator package

[0003] The invention relates to a stator package.

[0004] Engine cooling is an important issue that always requires improvement or alternatives. Especially when space is limited, conventional cooling systems run the risk of overheating the engine.

[0005] The invention is based on the object of improving this.

[0006] The object is achieved by claim 1, ie a stator package for a dynamoelectric machine, comprising at least one cooling channel, wherein at least one flow-influencing element is arranged in the cooling channel.

[0007] In forced-ventilated engines – especially main engines – laminar flow is advantageous in the cooling channels. This improves heat dissipation, for example, compared to self-cooled engines. Heat dissipation can be further improved by the arrangement of the flow-influencing element, as this induces turbulent flow. This advantageously further increases heat transfer from the laminated core to the cooling medium (e.g., air and / or water).

[0008] The stator core is preferably a laminated core. Other designs are also conceivable.

[0009] However, the invention can also be used for cooling channels through which a cooling medium other than air flows, in particular a cooling liquid. For this purpose, it is advantageous if the stator core is sealed. A design in which a plurality of flow-influencing elements are mounted in a cooling channel is advantageous.

[0010] The flow-influencing elements are advantageously arranged at the same distance from one another.

[0011] However, it is also possible that only one, in particular elongated element, is arranged or formed per cooling channel.

[0012] In an advantageous embodiment, the flow-influencing element has at least one square surface.

[0013] The flow-influencing element can, for example, have the shape of a cube or cuboid.

[0014] The flow-influencing element can also be designed as a cylinder or have another shape.

[0015] The flow-influencing element can be prefabricated and subsequently inserted, e.g. glued in.

[0016] However, an embodiment is preferred according to which the stator package has a plurality of material layers arranged one behind the other, wherein the flow-influencing element is formed at least partially in the cross section of a material layer.

[0017] The flow-influencing element is advantageously already part of the sheet metal cut. In other words, the element is preferably integrated directly into the stator sheet metal cut—i.e., the element is part of the respective stamped individual sheet.

[0018] Preferably, a first material layer is arranged offset by an angle a with respect to a second material layer.

[0019] Torsion stacking is advantageous. Due to the skewed edges of individual sheets (e.g., the sheet is thicker on the left than on the right), a sheet stack without torsion stacking would not fall straight, but would lean toward the thin side of the sheet. To avoid this effect, sheet stacks are advantageously torsion stacked, i.e., a first part of the sheet stack has the position 0°, a second part of the sheet stack 90°, a third part 180°, etc. This allows the thickness variations to be compensated, resulting in a well-formed sheet stack.

[0020] Alternatively, the twist stacking can also be performed in 180° increments. Other angle increments are also possible, depending in particular on the shape of the outer circumference of the stator stack or laminated core.

[0021] Preferably a = 90 ° or a = 180 ° or a = 270 ° .

[0022] Preferably, the stator package is a laminated core, wherein the material layers are individual sheets.

[0023] The problem is further solved by a stator having such a stator package.

[0024] The problem can also be solved by a dynamoelectric machine having a stator .

[0025] The problem is also solved by a method for producing a stator package, wherein individual sheets are punched, wherein a sheet cut of the individual sheet at least partially comprises flow-influencing elements.

[0026] Advantageously, the individual sheets are arranged by rotation through an angle a.

[0027] The invention is described and explained in more detail below with reference to the exemplary embodiments shown in the figures. They show:

[0028] FIG 1 possible designs and different arrangements of the flow-influencing elements,

[0029] FIG 4 a dynamoelectric rotary machine,

[0030] FIG 5 a method,

[0031] FIG 6 and 7 sheet sections,

[0032] FIG 8 sheets arranged one behind the other,

[0033] FIG 9 and 10 Cooling openings, shown without laminated core.

[0034] FIG 1 shows the front view of a stator package 1 of a dynamoelectric rotary machine 100 , see FIG 4 .

[0035] The stator package 1 comprises teeth 4 and slots 5 into which a winding can be inserted.

[0036] Flow-influencing element groups 20, 21, 22, and 23 are arranged in the cooling channels 30, 31, 32, and 33. An element group 21 comprises, for example, a plurality of flow-influencing elements 21a, 21b, 21c, 21d, see FIG. 3. The number of elements is purely exemplary. More or fewer elements may also be arranged.

[0037] Advantageously, the individual elements 21a-21d are arranged at a distance from one another. Preferably, the distance between two elements 21a and 21b is equal to the distance between two further elements 21b and 21c.

[0038] An equidistant arrangement is advantageous.

[0039] As an example and to better understand the following

[0040] Values ​​for an exemplary stator are given below: The stator package 1 has an axial length of 265 mm. The height of the cooling channel 30...33 is 35 mm. In this example, the length of the elements 21a...d is between 40 and 45 mm each. The distance between the elements 21a...d is advantageously between 40 and 45 mm. The elements 21a...d have, for example, a height of at least 1 mm and at most 4 mm.

[0041] An example of a flow-influencing element is a cuboid. Other geometric shapes such as cubes, cylinders, and others are also possible.

[0042] The flow-influencing element can also be an elongated element whose axial extension at least substantially corresponds to an axial length L (see FIG. 3) of the stator core. In this case, an element group comprises only one element. The element can be arranged at a distance from the respective axial end at both axial ends.

[0043] The flow-influencing element groups 20, 21 are arranged in FIG. 1 offset by an angle a = 180° with respect to the element groups 22 and 23. This is advantageous when several stator cores are arranged one behind the other in a twisted manner. FIG. 1 also shows the axes A1, A2, and A3 as well as a center point M. Another axis A4 is shown in FIG. 2.

[0044] FIG 2 shows a further embodiment. The flow-influencing element groups 20, 21 are arranged offset by an angle ß = 90° with respect to the element groups 24 and 25 in the cooling channels 34 and 35.

[0045] The elements are advantageously integrated directly into the sheet metal section. The rotation or offset arrangement allows the geometry to be varied along the length.

[0046] Depending on the angular step (90° or 180° or other) during the stacking, the elements are integrated into two adjacent (180° variant) or two opposite (90° variant) cooling channels of the sheet metal cut.

[0047] Analogous flow-influencing element groups can also be arranged at the opposite corners of the stator (not shown).

[0048] The elements or element groups 20-35 introduced into the cooling channels 30-35 force a turbulent flow, thereby advantageously increasing the heat transfer coefficient. Particularly in frameless machines, the elements can be specifically integrated into the cooling channel geometry by twisting the partial lamination stacks.

[0049] The invention offers the advantage that a higher heat transfer coefficient is possible through turbulent flow and thus a better heat dissipation behavior and a higher thermal engine utilization can be achieved.

[0050] FIG 4 shows the dynamoelectric rotary machine 100 with a stator 101, a rotor 6 and a shaft 7.

[0051] The stator 101 advantageously has at least one stator package 1

[0052] FIG 5 shows a method for producing a stator core, wherein in a method step S 1 individual sheets are punched, wherein a sheet metal cut of the individual sheet at least partially comprises flow-influencing elements.

[0053] In a process step S2, the individual sheets are arranged by rotation through an angle a. Other angles are also possible.

[0054] In a process step S3 the stator package is completed.

[0055] FIG 6 shows a sheet metal section 600. The sheet metal section 600 has four segments SEG1, SEG2, SEG3 and SEG4, which are formed by two axes A12 and A14 that intersect at the center point M. The segments SEG1 and SEG3 (as well as SEG2 and SEG4) are preferably constructed at least substantially identically, as shown in the FIG.

[0056] Thus, cooling channels 601A, 601B, 601C, and 601D are formed in segment 1 (SEG1), and cooling channels 603A, 603B, 603C, and 603D are formed in segment 3 (SEG3). Cooling channels 602A and 602B are formed in segment 2 (SEG2), and cooling channels 604A and 604B are formed in segment 4 (SEG4).

[0057] In comparison to a completely symmetrical sheet metal section, segments 2 and 4 differ in that the cooling channels are arranged offset and the number of cooling channels in this sub-segment is reduced by at least n-1 or increased by at least n+1 and preferably flow-influencing structures are formed which preferably result in a deflection of the flow into adjacent areas.

[0058] This advantageously creates a grid-shaped and / or honeycomb-shaped flow with increased cooling effect due to increased turbulence.

[0059] FIG. 7 shows a sheet metal section 700. Behind it lies the sheet metal section 600 shown in FIG. 6 (preferably, the sheet metal sections 600 and 700 are of the same type), which is arranged in a 90° twist stack. Elements 7001, 7003, 7005, 7006, and 7007, as well as lines 7002 and 7004, illustrate how the flow is influenced.

[0060] The elements 7001, 7002,..., 7006 show the cooling channels in the partial laminated core of the next level, see FIG 6 SEG2 (602A + 602B) .

[0061] FIG. 8 shows a plurality of laminations 800 arranged one behind the other. Furthermore, a flowing cooling medium 8001 is shown. P1, P2, P3, P4 show the different arrangements of, for example, pre-packaged, lamination stack segments.

[0062] FIGS. 9 and 10 show cooling openings without sheet metal. This illustration serves to illustrate the areas through which the cooling medium can flow.

[0063] The invention is particularly well-suited for frameless motors. Furthermore, cooling by means of a gas flow, such as air, is preferable. Alternatively, oil cooling or liquid cooling is possible, although a gas flow is preferred.

[0064] The air direction can be DE-NDE (drive end) or NDE-DE (non drive end).

[0065] Particularly advantageously, a stator has a plurality of such laminations and has a stator slot number of in particular ns = 36 or ns = 48.

[0066] The flow-influencing elements can be rectangular or have other shapes, for example semicircular trapezoidal and / or polygonal; the list is not exhaustive.

[0067] Alternatively, the lamination section itself can be designed by suitable asymmetries in such a way that the cooling channels themselves influence the flow by twisting the lamination stack (see FIG 8), thereby breaking up laminar flows and generating turbulent flows.

Claims

Patent claims 1. Stator package (1) for a dynamoelectric machine (100), comprising at least one cooling channel (30, 31, 32, 33), wherein at least one flow-influencing element (21a, 21b, 21c, 21d) is arranged in the cooling channel (30, 31, 32, 33).

2. Stator core (1) according to claim 1, wherein a plurality of flow-influencing elements (21a, 21b, 21c, 21d) are mounted in a cooling channel (30, 31, 32, 33).

3. Stator core (1) according to one of the preceding claims, wherein the flow-influencing elements (21a, 21b, 21c, 21d) are arranged at the same distance from one another.

4. Stator core (1) according to one of the preceding claims, wherein the flow-influencing element (21a, 21b, 21c, 21d) has at least one square surface.

5. Stator core (1) according to one of the preceding claims, comprising a plurality of material layers arranged one behind the other, wherein the flow-influencing element (21a, 21b, 21c, 21d) is formed at least partially in the cross section of a material layer.

6. Stator core (1) according to claim 5, wherein a first material layer is arranged offset by an angle a with respect to a second material layer.

7. Stator core (1) according to claim 6, wherein a = 90° or a = 180° or a = 270°.

8. Stator package (1) according to one of claims 5 to 7, wherein the stator package (1) is a laminated core, wherein the material layers are individual sheets.

9. Stator (101) comprising a stator package (1) according to one of claims 1 to 8.

10. Dynamoelectric machine (100) comprising a stator (101) according to claim 9.

11. A method for producing a stator core (1) according to one of claims 1 to 8, wherein individual sheets are punched, wherein a sheet metal cut of the individual sheet at least partially comprises flow-influencing elements.

12. The method according to claim 11, wherein the individual sheets are arranged by rotation through an angle a.

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