DE102017204397A1 - Sheet metal package segment, stator segment and stator for an axial flow electrical machine - Google Patents

Abstract

The present invention relates to a laminated core segment for an electric axial flux machine, comprising a stack of mutually electrically insulated sheets, with a formed with the stack tooth, which is adapted to receive a winding, and with a molded with the stack trapezoidal yoke, which for arranging a plurality of laminated core segments formed to each other to a circumferential polygonal shape. The present invention further relates to a stator segment for an electric axial flux machine with such a laminated core segment and a corresponding stator for an electric axial flow machine.

Description

FIELD OF THE INVENTION

The present invention relates to a laminated core segment for an electric axial flow machine, a stator segment for an electric axial flow machine and a stator for an electric axial flow machine.

TECHNICAL BACKGROUND

Electrical machines exist in various embodiments. An axial flow machine is one type of electrical machine in which the excited magnetic flux is directed axially of the shaft, i. in particular perpendicular to the plane of rotation, runs. Accordingly, arranged concentrically to the shaft windings are provided, whose central axis is also axially aligned.

Axialflussmaschinen can be made relatively flat, in particular in the axial direction. In particular, axial flow machines are therefore used in applications which have a small space in the axial direction to the requirement.

For example, this describes DE 10 2014 211 662 A1 a stator for an electric axial flow machine. In this case, the stator has a plurality of pole shoes, which are designed as metal teeth with a circular sector-shaped contour and protrude on a stator base body in a direction parallel to the axis of rotation of the axial flux machine.

Usually, however, the production of a suitable magnetic flux carrying part of the axial flow machine, in an axial flux motor usually the stator, relatively expensive.

SUMMARY OF THE INVENTION

Against this background, the object of the present invention is to provide an improved concept for constructing an axial flow machine, in particular a stator of an axial flow machine.

According to the invention, this object is achieved by a laminated core segment having the features of patent claim 1 and / or by a stator segment having the features of patent claim 10 and / or by a stator having the features of patent claim 13.

• - Ein Blechpaketsegment für eine elektrische Axialflussmaschine, mit einem Stapel voneinander elektrisch isolierter Bleche, mit einem mit dem Stapel geformten Zahn, der zur Aufnahme einer Wicklung ausgebildet ist, und mit einem mit dem Stapel geformten trapezförmigen Joch, welches zur Anordnung mehrerer Blechpaketsegmente aneinander zu einer umlaufenden polygonalen Form ausgebildet ist.
• - Ein Statorsegment für eine elektrische Axialflussmaschine, mit zumindest einem erfindungsgemäßen Blechpaketsegment, wobei der mit dem Stapel geformte Zahn mit einer Wicklung belegt ist.
• - Ein Stator für eine elektrische Axialflussmaschine, mit einer Mehrzahl umlaufend polygonal aneinander angeordneter erfindungsgemäßer Blechpaketsegmente und/oder einer Mehrzahl umlaufend polygonal aneinander angeordneter erfindungsgemäßer Statorsegmente.

Accordingly, it is provided:

• - A laminated core segment for an electric axial flow machine, comprising a stack of electrically insulated sheets, with a formed with the stack tooth, which is adapted to receive a winding, and with a stack shaped trapezoidal yoke, which for arranging a plurality of laminated core segments to each other encircling polygonal shape is formed.
• - A stator segment for an electric axial flow machine, with at least one laminated core segment according to the invention, wherein the tooth formed with the stack is covered with a winding.
• - A stator for an electric axial flow machine, with a plurality of circumferentially polygonally arranged according to the invention laminated core segments and / or a plurality of circumferentially arranged polygonal juxtaposed stator segments according to the invention.

The idea underlying the present invention is to provide a polygonal arrangement of a plurality of laminated core segments to simplify the manufacture of a stator of an axial flow machine, wherein the teeth are formed integrally with the laminated core segments. A laminated core segment is for this purpose formed with a stack of mutually insulated sheets, which forms a tooth intended and formed for receiving a winding and a trapezoidal yoke. It is also possible for a plurality of teeth to be formed with a stack which are provided partially or completely or all for accommodating a winding. The trapezoidal shape of the yoke serves for the flow-optimized circumferential polygonal arrangement of a plurality of such laminated core segments. The polygonal arrangement accordingly has a plurality of teeth which are suitable for receiving a winding and for magnetic flux guidance.

The laminated core segment is thus provided in particular to form a part of a polygonal return ring of a stator of an axial flow machine. Several such laminated cores are arranged in a polygonal manner to produce a stator in a simple manner together.

In particular, in the case of larger or more powerful axial flow machines, a higher number of laminated core segments may be provided for forming a polygonal arrangement, while smaller sheet metal packet segments may be provided for smaller or less powerful axial flow machines. The principle according to the invention can thus be scaled in a particularly advantageous manner without great manufacturing effort to different sizes or performance classes.

According to the invention, it is advantageously possible in particular to dispense with complicated production methods for producing parts carrying magnetic flux in axial flow machines, such as winding or sintering. For example, a complex winding process in which a flux-return ring with the teeth is wound together to form a package is necessary. Thus, according to the invention, individual sheets or metal strips can be better utilized and less punching waste is produced. Cost-intensive pressing of return ring and teeth as a one-piece component made of so-called soft magnetic composite (SMC) material is advantageously avoided.

Rather, according to the invention, suitable, in particular straight, sheets can be simply cut out or punched out correspondingly to the shape of the tooth and the yoke, packetized in laminated core segments corresponding to the trapezoidal shape of the yoke and arranged polygonal against one another. In particular, a metal-free production is advantageously possible, in particular since bending or winding of metal sheets is not necessary. Furthermore, a modular prefabrication of the laminated core segments is possible.

Overall, according to the invention, a concept for constructing an axial flow machine, in particular a stator of an axial flow machine, is provided, which realizes a high efficiency of the axial flow machine with comparatively low production outlay.

The trapezoidal yoke in particular represents a non-wound section of the stack. It is intended that during operation of an axial flux machine the magnetic field lines in the stator close without significant resistance.

In particular, the respective yokes together form a polygonal return ring in the circumferential polygonal arrangement of a plurality of laminated core segments. The circumferential shape serves to improve the magnetic flux control or to reduce the magnetic resistance and is in particular closed circumferentially, with small gaps or joints at the separation points of the laminated core segments are possible without much loss.

In particular, the circumferential polygonal shape of the arrangement of a plurality of laminated core segments is provided as a convex, preferably regularly convex, n-polygonal or polygonal shape. In particular, the circumferential polygonal shape is provided at one of an outer circumference and an inner circumference of the assembly. By way of example, a polygonal arrangement of a plurality of laminated core segments triangular, in particular isosceles triangular, or, in particular regularly, pentagonal (five corners), hexagonal (six corners), octagonal (eight corners), nonagonal (nine corners), decagonal (ten corners), dodekagonal ( twelve corners) or the like. Also polygonal shapes with more than twelve corners, for example pentadekagonal (15 corners), hexadecagonal (16 corners), u. s. w. are possible.

Preferably, the yoke with its trapezoidal shape lies in a longitudinal sectional plane of a laminated core segment which does not cut the tooth.

The trapezoidal shape of the yoke can be a variety of trapezoidal shapes suitable for a desired polygonal arrangement of the laminated core segments. In particular, a bottom plate of the stack forms a first parallel edge and a top plate of the stack forms a second parallel edge of the trapezoidal shape. The non-parallel edges are formed in particular by the end faces of the stacked sheets.

Adapted to the desired polygonal shape of the arrangement, a pitch of the non-parallel edges of the trapezoidal yoke or an angle to the parallel edges of the trapezoidal yoke is provided accordingly. Furthermore, although it is preferably but not necessarily an isosceles or symmetrical trapezoidal shape. Also asymmetrical trapezoidal shapes with different pitch of the non-parallel edges, in particular for arrangement in irregular polygonal shapes, are possible.

In particular, the trapezoidal shape is essentially a trapezoidal shape, which permits smaller, in particular production-related, deviations from an ideal trapezoidal shape.

In particular, but not necessarily the two formed by the end faces of the stacked sheets non-parallel edges of the yoke may be formed obliquely corresponding to the edge course or an edge slope. For example, the end faces of the individual sheets may also have a straight edge produced by vertical cutting, in particular by punching. In this case, the non-parallel edges of the trapezoidal shape thus have a step-like surface formed by the end faces of the stacked sheets.

Ideally, the sheets are flat so that the parallel edges of the trapezoidal shape formed by the top and bottom sheets are straight and / or smooth. However, also, in particular production-related, curvatures of the sheets are possible. When stacking the sheets, this may therefore possibly. lead to a certain curvature of the parallel edges of the trapezoidal shape of the yoke.

For electrical insulation of the individual sheets from each other at least one side of the sheets may be provided with an electrically insulating coating. It is also conceivable to provide an insulating layer in each case between two sheets. By providing an insulation between the individual sheets of the laminated core segments eddy currents are advantageously avoided.

For packaging, the stack may be firmly connected by a non-positive, positive and / or material-locking connection technique, for example by gluing, stamping, welding or the like.

The tooth is provided in particular for axial alignment or alignment parallel to the shaft or axis of rotation of an axial flow machine. Accordingly, it is designed in particular for receiving a coil aligned axially with its central axis, the winding of which runs correspondingly in the circumferential direction.

Furthermore, a pre-assembly of a finished laminated core segment with a winding to a stator segment is possible. For this purpose, the tooth is covered with a winding, which in particular involves isolation of the tooth from the winding. In particular, the tooth can be provided with an insulating winding support or coated with an insulating layer. Subsequently, the tooth is wound or provided with a finished bobbin or bobbin. It is also conceivable to apply a coil already pre-wound on an insulating winding support to the tooth together with the insulating winding support.

Thus, a modular stator segment is provided, which can be advantageously installed in a few steps with other stator segments to a stator.

Another way of insulating the teeth is to provide a common insulating winding support for the entire circumferential polygonal shape of a stator. In this case, a required for the formation of the polygonal shape plurality of laminated core segments is inserted into the winding support or the winding support placed over the polygonal arrangement of the laminated core segments. Subsequently, the teeth can be covered or equipped with windings for producing a stator.

For producing a stator for an electric axial flow machine, the following steps are thus provided in particular: provision of a plurality of laminated core segments according to the invention or of a plurality of stator segments according to the invention; and circulating polygonal arrangement of the segments with each other.

In particular, the segments are fastened together. For this purpose, a wide variety of fastening means may be provided, for example, the inclusion in a laminated core holder or in a common winding carrier. Also pinning, welding, gluing or splashing together of the laminated cores (eg in plastic) is possible.

A corresponding axial flow machine with a stator according to the invention can be used or provided as an axial field motor and / or as a corresponding generator, depending on the design and / or control.

Advantageous embodiments and further developments will become apparent from the other dependent claims and from the description with reference to the figures of the drawing.

According to one embodiment, the sheets of the stack each have a planar shape. In this way, the stacking and packaging of the sheets to a laminated core segment is advantageously made possible in a simple manner, so that the production is greatly simplified.

According to a further embodiment, the sheets of the stack are firmly connected to each other. In this way, the handling of the laminated core segments is simplified and unwanted transverse displacements of the sheets are prevented. Furthermore, such an improved mechanical strength and a reduction of noise developments can be achieved.

In particular, the sheets are glued together. In addition, the stack can also be a laminate with further layers, for example insulating layers.

In particular, an adhesive used for firmly joining the sheets can simultaneously form an insulating layer. By way of example, a curable lacquer, in particular a so-called baked enamel, can be used as adhesive. This is applied to the individual sheets before stacking the sheets and activated or cured after stacking. For example, an activation / curing by heat input can be made, in particular by inductively generated heat input. In this way, the stack is baked and firmly connected. Furthermore, to make a solid connection is a complete Impregnating or potting or riveting the sheets conceivable.

According to one embodiment, the yoke forms a symmetrical trapezoidal shape. In particular, the sheets are centered relative to each other so that the non-parallel edges of the trapezoidal shape are symmetrical to each other. This advantageously allows a particularly simple and regular or symmetrical polygonal arrangement of the laminated core segments.

According to one embodiment, the trapezoidal shape of the yoke is formed with a continuously varying along a stack height length of the sheets. In particular, the length of the sheets increases steadily along the stack height. Thus, the non-parallel edges of the trapezoidal yoke are formed. Advantageously, this is achieved purely by the corresponding different cutting or cutting and stacking of the sheets in a suitable order without additional forming or separating steps.

According to one embodiment, the sheets have recesses which are arranged at least in sections in register with one another to form a groove surrounding the tooth. In this way, the integral formation of the tooth and the groove with the sheets in a simple manner by a corresponding cutting of the sheets before stacking feasible. For example, this can already be done by a corresponding separation from a blank, for example by punching or laser beam cutting. In further embodiments, it would also be conceivable first to form a stack of firmly connected sheets and then to wipe out the groove or the shape of the tooth from the sheet package thus formed. In this case, the recesses would thus be formed after the stacking of the sheets.

In one embodiment, the recesses congruent, in particular completely congruent, may be provided to form a straight groove. It is advantageous in this way a high accuracy in the arrangement of the sheets in a stack or compliance with tight tolerances allows.

In further embodiments, the recesses may be arranged differently large or different and so a predetermined odd Nutverlauf, z. B. a rounded Nutverlauf form. For example, teeth with rounded edges can be formed in this way by rounded grooves, which, depending on the type of winding, may simplify an occupation of the teeth with one winding or reduce the risk of injury to an insulating layer.

According to an advantageous embodiment of the tooth and the groove for receiving a single-layer winding are formed. In a corresponding embodiment of a stator segment only one winding is provided in a groove between two adjacent teeth instead of two windings of the adjacent teeth. This means that in a corresponding embodiment of a stator only every second tooth is covered with a winding. However, in this case, the groove may be made narrower in comparison with a two-layer winding (with two windings in a groove), so that the winding of the occupied tooth is directly adjacent to the unoccupied tooth. Alternatively or additionally, the winding can also be formed correspondingly wider or stronger in the case of a single-layer winding than in the case of a two-layer winding. In this way, an adjacent unoccupied tooth can be excited by the winding of the occupied tooth and thus be used for the magnetic flux. Furthermore, less contact points and less electronics are needed so advantageous. Thus, a total of a higher winding filling level can be achieved.

Alternatively or additionally, the tooth and the groove can also be designed to receive a two-layer winding. In this case, two windings or two coil sides can be arranged in a groove. The groove is provided correspondingly wider and / or the windings are provided correspondingly narrower.

According to one embodiment, the tooth is arranged centrally on the stack. In particular, the tooth is surrounded by two grooves formed by the recesses of the sheets. Preferably, the grooves are bounded on both sides by the sheets. In this way, a single-layer winding is particularly advantageous, wherein a separation point of two adjacent laminated core segments is not in the wound tooth. Thus, the geometry of the bobbin can be simplified. Furthermore, coil connections or contact points are reduced. Geometrically particularly favorable, the monolayer winding can be used in the case of a rectangular, in particular square, coil geometry. Alternatively, however, a two-layer winding can also be used.

In a corresponding embodiment of a stator segment of the tooth is formed with the stack of a single laminated core segment. There is thus no separation point in the tooth.

According to a further embodiment, the tooth is arranged on the end side at the stack or at the longitudinal end of the stack. Thus, the common formation of a two-part wound with a winding or wound tooth allows together with an adjacent laminated core segment, wherein the end-side tooth forms part of the two-part tooth. This allows a flow-favorable arrangement of the separation point of two adjacent laminated core segments within a wound tooth.

In a corresponding embodiment of a stator segment thus a first laminated core segment and a second laminated core segment are provided, wherein a first stack of the first laminated core segment forms a first part of the tooth and a second stack of the second laminated core segment forms a second part of the tooth. Here is a separation point of two adjacent laminated core segments thus in the wound or occupied tooth. Since the separation point runs parallel to the magnetic flux lines within the tooth, advantageously little or no losses arise in this way. In particular, the end-side tooth forms a first half of the two-part tooth, while the end-side tooth of an adjacent laminated core segment forms a second half of the two-part tooth. Thus, the separation point is arranged centrally in the two-part tooth and is advantageous also from the center of the tooth dividing flow lines in the way.

According to one embodiment, the first laminated core segment and the second laminated core segment can be connected to one another for this purpose. There are a variety of types of fastening in question, such as pinning, welding, gluing or splashing together. In one embodiment, a connection can also be realized by means of a receptacle of the laminated core segments in a common holder or laminated core holder.

According to one embodiment of a stator, the planes of the individual sheets of the laminated core segments are respectively oriented in the axial and in the tangential direction. Preferably, an axial and tangential magnetic flux is thus made possible, whereby eddy currents are blocked or avoided by the insulation of the sheets, which acts in the radial direction.

According to one embodiment of the stator, the teeth are covered with a single-layer winding. Accordingly, every other tooth in particular is unoccupied and is excited by the winding of adjacent occupied teeth.

In a further embodiment, a two-layer winding may also be provided. In this case, each tooth is covered by a winding.

The above embodiments and developments can, if appropriate, combine with each other as desired. In particular, all features of the laminated core segment can be transferred to a stator segment and / or to a stator. Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

list of figures

• 1 eine perspektivische Ansicht eines Blechpaketsegments;
• 2 eine schematische Vorderansicht eines Statorsegments;
• 3 eine perspektivische Ansicht eines Stators;
• 4 eine perspektivische Ansicht einer Axialflussmaschine;
• 5 eine perspektivische Ansicht eines Blechpaketsegments gemäß einer weiteren Ausführungsform;
• 6 eine schematische Vorderansicht eines Statorsegments gemäß einer weiteren Ausführungsform;
• 7 eine perspektivische Ansicht einer beispielhaften Anordnung mehrerer Blechpaketsegmente aneinander zu einer umlaufenden polygonalen Form;
• 8 eine perspektivische Ansicht eines Halters zur Befestigung der Anordnung nach 7;
• 9 eine perspektivische Ansicht eines Stators gemäß einer weiteren Ausführungsform;
• 10 eine Draufsicht auf den Stator gemäß 9;
• 11 eine perspektivische Ansicht eines Stators gemäß einer weiteren Ausführungsform; und
• 12 eine perspektivische Ansicht des Stators gemäß 11.

The present invention will be explained in more detail with reference to the exemplary embodiments indicated in the schematic figures of the drawing. It shows:

• 1 a perspective view of a laminated core segment;
• 2 a schematic front view of a stator segment;
• 3 a perspective view of a stator;
• 4 a perspective view of an axial flow machine;
• 5 a perspective view of a laminated core segment according to another embodiment;
• 6 a schematic front view of a stator according to a further embodiment;
• 7 a perspective view of an exemplary arrangement of a plurality of laminated core segments together to form a circumferential polygonal shape;
• 8th a perspective view of a holder for securing the arrangement according to 7 ;
• 9 a perspective view of a stator according to another embodiment;
• 10 a plan view of the stator according to 9 ;
• 11 a perspective view of a stator according to another embodiment; and
• 12 a perspective view of the stator according to 11 ,

The accompanying figures of the drawing are intended to convey a further understanding of the embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention. Other Embodiments and many of the stated advantages will become apparent with reference to the drawings. The elements of the drawings are not necessarily shown to scale to each other.

In the figures of the drawing are the same, functionally identical and same-acting elements, features and components - unless otherwise stated - each provided with the same reference numerals.

DESCRIPTION OF EMBODIMENTS

1 shows a perspective view of a laminated core segment. 1

The laminated core segment 1 has a stack 2 from a variety of sheets 3 on. Purely by way of example, the stack shown here 2 a total of 15 sheets 3 on. The number and thickness of the sheets 3 Of course, it can be changed or adapted as needed.

The laminated core segment 1 also has a tooth 5 on which one with the stack 2 is formed and adapted to receive a winding 6, as in 2 shown.

In addition, the laminated core segment has a transverse to the tooth yoke 4 on, which also with the stack 2 is formed and has a trapezoidal shape. It is a trapezoidal arrangement of the stacked sheets in longitudinal section 3 , The yoke 4 is accordingly formed to form a plurality of laminated core segments together to form a circumferential polygonal shape, as in 3 shown.

In the in 1 illustrated embodiment, both the tooth 5 as well as the yoke 4 formed with all the sheets of the stack 2.

The sheets 3 For forming the stack may in particular contain a soft magnetic material. For example, it may be sheet metal strip of a soft magnetic metal or a soft magnetic metal alloy. For this purpose, for example, metals or metal alloys based on iron, nickel and / or cobalt come into question. It may also be a soft ferrite, such as a nickel-zinc ferrite NiZn, for example in the composition Ni _a Zrl _(1-a) Fe ₂ O ₄ , or a manganese-zinc ferrite MnZn, for example in the composition Mn _a Zn _(1-a) Fe ₂ O ₄ , or the like. Furthermore, to form the stack, the sheet may also be made of a typical electrical sheet of suitable thickness, for example, M 800, M 530, M 330, or the like. However, the invention is not limited to the aforementioned metal alloys nor to the examples of electrical sheets mentioned above.

In the illustrated embodiment, the sheets are 3 each formed as a flat sheet metal strip. These are isolated from each other and firmly connected. By way of example, they are glued together in the illustrated embodiment, wherein a not shown in detail adhesive layer between the sheets 3 is provided and at the same time provides isolation of the sheets from each other.

The sheets each have a recess provided on the front side of the stack 2 7 on. By way of example, the recesses 7 are here rectangular. The recesses 7 thus extend from the front of the stack 2 across the pile 2 into it. By way of example, they coincide completely here and thus form a continuous straight groove 8th out, which extends through the entire stack 2 extends.

Through recesses 7 or in connection to the respective groove 8th is the tooth 5 shaped. Here are two grooves for example 8th provided which the tooth 5 surround. Due to the straight groove geometry is the tooth 5 shaped accordingly rectangular. In other embodiments, however, even odd, in particular rounded, Nutverläufe are possible, which by correspondingly differently shaped and / or correspondingly arranged recesses 7 is reached. In this way, another, for example, a rounded tooth geometry can be provided.

In the illustrated embodiment, it is a center of the laminated core segment 1 arranged tooth 5 , This is designed to receive a winding 6, not shown here, which surrounds the tooth 5 around through the grooves 8th extends through.

At the tooth 5 and the recesses 7 opposite back of the stack 2 is the yoke 4 formed, which extends continuously over the entire length of the stack. The yoke 4 has in longitudinal section a symmetrical trapezoidal shape, which by different lengths of the stacked sheets 3 arises. The lengths of the sheets 3 to increase along the stack height steadily. The non-parallel edges of the trapezoidal shape are formed by the longitudinal end faces of the sheets. In the illustrated embodiment, the end faces are formed without additional processing as vertical edges, so that the non-parallel edges of the trapezoidal shape are formed here due to the thickness of sheet metal staircase.

The staircase shape is advantageous without additional processing very easy to manufacture. However, that is not necessarily provided such a staircase shape. Rather, in other embodiments, the sheets may also be cut or shaped obliquely according to the intended pitch of the non-parallel edges of the trapezoidal shape.

At the longitudinal ends of the laminated core segment, on which the non-parallel edges of the trapezoidal shape are provided, the stack has 2 one more tooth each 5 ' on. This is not intended to accommodate a winding, but can with one on the central tooth 5 included winding to be energized. The end tooth 5 ' is thus on the one hand by the respective groove 8th limited and, moreover, has a contour corresponding to the shape of the yoke

2 shows a schematic front view of a stator 9.

The schematic representation comprises a schematically illustrated laminated core segment 1 how it regards 1 was explained. In addition, a schematically illustrated winding 6 provided, which is around the tooth 5 around through the grooves 8th extends.

In the illustrated winding 6 it is a so-called single-layer winding. Accordingly, only one winding is in a groove 8th provided so that an adjacent to the respective groove 8th adjacent tooth, here in each case the end arranged tooth, not covered with a winding.

Between the winding 6 and the tooth 5 an insulation, not shown here is provided. For example, it may be an insulating winding carrier.

Other types of insulation, such as insulating layers applied to the tooth, are also possible.

A plurality of such stator segments 9 can be over the non-parallel edges of the trapezoidal yoke 4 of the laminated core segment 1 arrange each other polygonal circumferentially. In this way, a stator 10 assembled or formed.

3 shows a perspective view of a stator 10 , Due to the symmetry of the arrangement, only an upper half is shown.

The stator 10 has a plurality 22 of stator segments 9 on which according to 2 with a centrally located and covered with a single-layer winding tooth 5 are constructed and in the region of the non-parallel edges of the respective yokes 4 or the end-side teeth are arranged adjacent to each other. separation points 31 between the individual laminated core segments 1 lie here thus each in the unwound or unoccupied end teeth.

Those at the empty teeth 5 ' intended separation point 31 points through the trapezoidal shape of the yoke 4 and their continuation at the end teeth 5 ' consistently only a very narrow gap on. Thus, the magnetic flux in relation to a one-part return ring is not obstructed appreciably or only negligibly here, so that a magnetic resistance is comparably large.

In particular, the laminated core segments 1 or stator segments 9 also attached to each other. Accordingly, fastening means may be provided, which are not shown here in detail. For example, this may be a holder for receiving the laminated core segments and / or pins connecting to the laminated core segments, welds, adhesives or the like.

4 shows a perspective view of an axial flow machine 30 ,

The axial flow machine 30 has a stator 10 according to 3 and a rotor 24 on which a magnetic ring 25 contains. In the illustrated embodiment of an axial flow machine 30 is an example of an axial flux motor.

The magnetic ring 25 has a round return ring and a plurality of non-individually shown, for example glued, permanent magnet or a single ring magnet. During operation of the axial flow machine 30 are the ones with the windings 6 and the teeth 5 formed electromagnet controlled so that they attract the permanent magnets as needed, so that the rotor 24 around the axis of rotation schematically drawn here 26 rotates. In the non-wound teeth excited magnetic flux is also used to drive. Incidentally, the general mode of action of an axial flow machine is familiar to the person skilled in the art, so that will not be discussed in detail here.

5 shows a perspective view of a laminated core segment 11 according to a further embodiment.

As in the embodiment according to 1 has the laminated core segment 11 a stack 12 with a variety of stacked sheets 13 on. Here too is a trapezoidal yoke 14 intended.

In contrast to the embodiment according to 1 here is just a groove 18 in the pile 12 provided, which by corresponding recesses 17 the sheets 13 is shaped. Exemplary is the groove 18 provided centrally in the stack. Accordingly, the laminated core segment 11 only two end teeth 15 on the longitudinal sides of the laminated core segment on which the non-parallel edges of the yoke 14 are provided. The teeth 15 are thus on the one hand by the groove 18 limited and otherwise according to the shape of the yoke 14 educated.

In this embodiment, at least one of the end teeth 15 provided for receiving a winding.

Incidentally, in relation to the embodiment according to 1 described features of a laminated core segment 1 also on the laminated core segment shown here 11 transferable.

6 shows a schematic front view of a stator segment 19 according to a further embodiment.

The stator segment 19 has a first schematically illustrated laminated core segment 11A and a second schematically illustrated laminated core segment 11B on which each as in relation to 5 describe are formed and each have their own stack 12A . 12B exhibit.

Furthermore, a common winding 16 provided, which through the grooves 18A . 18B the laminated core segments 11A . 11B extends. The adjacent end teeth of the laminated core segments 11A . 11B form here accordingly a first part 15A and a second part 15B a wound with the winding 16 two-part tooth 32 ,

7 shows a perspective view of an exemplary arrangement of a plurality of laminated core segments 11 to each other to a circumferential polygonal shape.

By way of example, here is a plurality 21 of six circumferentially polygonal laminated core segments 11 according to 5 shown. Accordingly, it is a hexagonal shape of the arrangement. The slopes of the non-parallel edges of the laminated core segments are designed to form a hexagonal shape. With such an arrangement, a hexagonal stator can thus be formed.

separation points 31 between the individual laminated core segments 11 are here each in the teeth 15 intended. In this embodiment, thus, regardless of whether the teeth 15 are covered with a single-layer winding or a two-layer winding, always a separation point 31 lie within the wound tooth.

8th shows a perspective view of a holder 23 for fixing the arrangement according to 7 ,

The holder 23 is accordingly as laminated core segment holder for holding a hexagonal circumferential arrangement of six laminated core segments 11 educated.

The holder 23 has a hub 27 for receiving a rotation axis of an axial flow machine 30 on. There are also six shots in total 28 provided, which in each case for receiving a laminated core segment 11 are formed.

The holder 23 is provided, for example, the laminated core segments 11 for forming a stator 20 absorb and accordingly fasten together. For attachment of the individual laminated core segments 11 in the recordings 28 are suitable locking means 29 , here exemplified in the form of latching hooks provided.

9 shows a perspective view of a stator 20 according to a further embodiment.

10 shows a plan view of the stator 20 according to 9 ,

The majority 21 the laminated core segments 11 according to 7 is here in the holder 23 according to 8th picked up and attached. By way of example, the illustrated embodiment is preferably a stator 20 an axial flow machine.

The stator has six in each case together with the end-side teeth 15 of two adjacent laminated core segments 11 formed two-piece teeth 32 on. Each tooth of the stator thus has a separation point 31 or a joint of two adjacent laminated core segments 11 on.

For better clarity are windings 16 not shown here. These can, as in 6 shown in a single-layer winding on three of the six illustrated two-piece teeth 32 be provided. In further embodiments, a two-layer winding would be possible, so that each of the illustrated two-piece teeth 32 would be occupied with its own winding. In this case, there would be 2 turns inside each of the slots 18 the laminated core segments 11 run.

In the wrapped two-piece tooth 32 This is always a separation point 31 , A fugue of separation point 31 runs parallel to the magnetic flux lines through the tooth 32 , so that advantageously no or only negligible resistance to the magnetic flux arises.

In the case of a single-layer winding, the separating point provided on the unoccupied teeth has 31 only a narrow gap. Thus, the magnetic flux is impeded only negligible compared to a one-part return ring here, too. A magnetic resistance is correspondingly large.

Before applying windings, insulation is applied to the two-piece teeth 32 applied. For this purpose, in particular an unillustrated insulating winding support, which may be designed in particular as an injection molded part, slipped over the teeth. Preferably, it is similar to the holder 23 a common component for all laminated core segments 11 the polygonal arrangement.

As an alternative or in addition to an insulating winding support, it is also possible to provide an electrically insulating coating of the tooth, for example by means of a powder coating method or a dip coating or by an encapsulation or a winding or the like.

In the same way as in relation to 4 can describe the stator 20 in an axial flow machine (instead of the in 4 with 10 designated stator) for driving the rotor 24 be used.

11 shows a perspective view of a stator 10 ' according to a further embodiment.

Due to the symmetry of the arrangement, only one half, here the lower half, is shown.

The stator 10 ' has a plurality 21 circumferentially polygonal juxtaposed laminated core segments 1' on. These are essentially the same as the laminated core segments 1 to 1 educated and the same as in relation to 3 described in the region of the non-parallel edges of the respective yokes 4 or the end teeth 5 ' arranged adjacent to each other.

In contrast to 1 to 3 are the arranged at the longitudinal ends of the laminated core segments teeth 5 ' on which the non-parallel edges of the trapezoidal shape are provided, here in addition to the central teeth 5 , also for receiving a winding 6 ' intended. It is a common winding 6 ' two adjacent laminated core segments 1' , This is illustrated here by way of example with reference to two laminated core segments designated 1'A and 1'B, where the common winding 6 ' through the grooves 8th the laminated core segments 1 'extends. The adjacent end teeth 5 ' the laminated core segments 1' form here accordingly a first part 5'A and a second part 5'B of one with the common winding 6 ' occupied two-part tooth 32 ' ,

Accordingly, the stator 10 ' here a two-layer winding on. That is, every tooth 5 . 32 ' or any part of a tooth 5 ' . 5'A . 5'B is covered by a winding. For example, compared to 2 or 3 only the width or thickness of the windings 6 . 6 ' be provided adapted, for example, about half. Alternatively or additionally, this can also be the width of the grooves 8th and / or the teeth 5 . 5 ' be adapted to the two-layer winding provided.

12 shows a perspective view of the stator 10 ' according to 11 ,

Visible are the laminated core segments 1' through the two-layer winding on each of her teeth 5 . 5 ' busy. Because the separation points 31 between the laminated core segments 1' also in each case by the two adjacent laminated core segments 1' formed two-part teeth 32 ' are the individual stator segments 9 'here about the common windings 6 ' connected with each other.

Although the present invention has been fully described above with reference to preferred embodiments, it is not limited thereto but is modifiable in a variety of ways.

For example, a holder 23 also be formed integrally with an insulating winding support. In this case, the shots 28 have a pocket for isolated recording of the teeth. The laminated core segments are then turned over, ie with the teeth ahead, into the receptacles 28 inserted and locked in it. A winding is here at a back of the holder 23 provided around the area of the tooth receiving pocket.

The principle of receiving the laminated core segments 11 in a holder 23 or an integrally formed with an insulating winding support holder 23 is in the same way to the embodiment according to 1 to 4 or their laminated core segments 1 as well as the embodiment according to 11 and 12 or their laminated core segments 1' transferable.

In all embodiments, it would also be conceivable, the operation of the axial flow machine 30 to reverse, ie the magnetic ring 25 to provide as a stator, the arrangement according to 3 or the arrangement according to 9 and 10 (If necessary. Reinforced in mechanically suitable manner for supporting Zentripetalkräften) acts as a rotor.

LIST OF REFERENCE NUMBERS

1, 1 '

Laminated core segment

2

stack

3

sheet

4

yoke

5, 5 '

tooth

5'A

first part

5'B

second part

6, 6 '

winding

7

recess

8th

groove

9

stator

10, 10 '

stator

11

Laminated core segment

11A, 11B

Laminated core segment

12

stack

12A, 12B

stack

13

sheet

14

yoke

15

tooth

15A

first part

15B

second part

16

winding

17

recess

18

groove

19

stator

20

stator

21

majority

22

majority

23

holder

24

rotor

25

magnetic ring

26

axis of rotation

27

hub

28

admission

29

latching means

30

axial flow

31

separation point

32, 32 '

two-piece tooth

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014211662 A1 [0004]

Claims (15)

Laminated core segment (1; 1 '; 11; 11A; 11B) for an axial flow electrical machine (30), with a stack (2; 12; 12A; 12B) of mutually electrically insulated sheets (3; 13), a tooth (5; 15) formed with the stack (2; 12; 12A; 12B) and adapted to receive a winding (6; 16), and with a trapezoidal yoke (4; 14) formed with the stack (2; 12; 12A; 12B), which is designed to arrange a plurality of laminated core segments (1; 1 '; 11; 11A, 11B) into a circumferential polygonal shape. Sheet metal segment after Claim 1 , characterized in that the sheets (3; 13) of the stack (2; 12; 12A; 12B) each have a planar shape. Sheet metal segment after Claim 1 or 2 , Characterized in that the plates (3; 13) of the stack (2; 12; 12A; 12B) fixedly connected together, in particular glued, are. Laminated core segment according to one of the preceding claims, characterized in that the yoke (4; 14) forms a symmetrical trapezoidal shape. Sheet metal segment after Claim 4 , characterized in that the trapezoidal shape of the yoke (4, 14) is formed with a length of the sheets (3, 13) which is constantly changing along a stacking height, in particular increasing. Sheet-metal packet segment according to one of the preceding claims, characterized in that the sheets (3; 13) have recesses (7; 17) arranged at least in sections in register with one another to form a groove (8; 18) surrounding the tooth (5; are. Sheet metal segment after Claim 6 , characterized in that the tooth (5; 15) and the groove (8; 18) are designed to receive a single-layer winding and / or a two-layer winding. Sheet metal segment according to one of the preceding claims, characterized in that the tooth (5; 15) is arranged centrally on the stack (2; 12; 12A; 12B), in particular surrounded by two through the recesses (7; 17) of the sheets (3 13) formed grooves (8; 18). Laminated core segment after one of Claims 1 to 7 , characterized in that the tooth (15) is arranged on the end of the stack (12, 12A, 12B). A stator axial segment (9; 9 '; 19) for an electric axial flow machine, comprising at least one laminated core segment (1; 1'; 11; 11A, 11B) according to any one of the preceding claims, wherein one with the stack (2; 12; 12A, 12B). shaped tooth (5; 5 '; 32; 32') is covered with a winding (6; 6 '; 16). Stator segment after Claim 10 , characterized in that the tooth (5) with the stack (2) of a single laminated core segment (1) is formed. Stator segment after Claim 10 characterized in that a first laminated core segment (1'A; 11A) and a second laminated core segment (1'B; 11B) are provided, wherein a first stack (2; 12A) of the first laminated core segment (1'A; Part (5'A; 15A) of the tooth (32; 32 ') and a second stack (2; 12B) of the second laminated core segment (1'B; 11B) comprise a second part (5'B; 15B) of the tooth (32; 32 ') forms. Stator (10; 20) for an electric axial flux machine, comprising a plurality (21) of circumferentially polygonally arranged laminated core segments (1; 1 '; 11) according to one of the Claims 1 to 9 and / or a plurality (22) of circumferentially polygonal stator segments (9; 9 '; 19) according to one of the Claims 10 to 12 , Stator after Claim 13 , characterized in that the planes of the individual sheets (3, 13) are respectively oriented in the axial and in the tangential direction. Stator after Claim 13 or 14 , characterized in that the teeth (5, 5 ', 32, 32') are covered with a single-layer winding or a two-layer winding.

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