Stator arrangement for an electric motor

Abstract

Stator arrangement (100) for an electric motor, comprising: a cylinder jacket-shaped stator body (10) with a plurality of axially aligned receiving grooves (11) on an inner side of the stator body (10), a plurality of electrically conductive pins (20), each having a bending side (B) and two legs (21) extending from the bending point (B) which open to a twisting side (T) of the pins (20), wherein the legs (21) of the pins (20) are received in the receiving grooves (11) of the stator body (10) from the bending side (B) to the twisting side (T), wherein in the receiving grooves (11) seen in a radial direction of the stator body (10) at least three layers (1, 2, 3) are formed by the legs (21) of the pins (20), wherein in each layer (1, 2, 3) in the receiving grooves (11) at least two legs (21) of the pins (20) are arranged adjacent to one another, and wherein the legs (21) of different pins (20) are electrically interconnected on the twist side (T), wherein on the twist side (T) the legs (21) of the pins (20) of the same layer (1, 2, 3) are twisted in different directions and the legs (21) of the adjacent pins (20) between different layers (1, 2, 3) are twisted in the same direction, characterized by that the pins (20) of at least one layer (1, 2, 3) of the at least three layers (1, 2, 3) are bent in the same direction on the bending side (B) and / or that the pins (20) of at least one layer (1, 2, 3) are bent in different directions on the bending side (B), wherein the bends are made radially inwards or radially outwards, so that the legs (21) of the pins (20) are received at different depths in the receiving grooves (11).

Description

The invention relates to a stator arrangement for an electric motor according to the independent device claim, an electric motor with a corresponding stator arrangement according to the independent device claim, and a method for producing a corresponding stator arrangement for an electric motor according to the independent method claim.High-voltage electric motors are required for operating the electric vehicles. One type of electric motor has a pin-and-pin technique for mounting a stator body. In this case, a plurality of plug-in needles having two limbs, so-called hair pins, are each guided with one limb through special receiving grooves on an inner side of the stator body. These legs have a bending side at the apex and open to a twist side at which the legs are bent once again. Subsequently, the legs of different pins are electrically connected to each other, for example, by welding, to provide one or more windings through a plurality of pins. Such a stator arrangement is known from JP 2012-110077 A.The electric motors are usually operated at high switching speeds. This places the windings within the electric motors under severe operating conditions. High potential differences can develop between the windings. Therefore, expensive high-performance insulations are required. At high speeds of sound, the partial discharge and thus the risk of a winding closure simultaneously increases. In addition, the problems of flexible numbers of turns arise in such electric motors. In addition, such electric motors are subject to strict space restrictions, since the available space in the vehicle is limited.The object of the invention is therefore to provide an improved stator arrangement for an electric motor. In particular, it is the object of the invention to provide a stator arrangement for an electric motor which is of simple and cost-effective design, which can be of simple construction and can be operated with reduced potential differences. In addition, it is an object of the invention to provide an improved electric motor having a corresponding stator arrangement and an improved method for producing a corresponding stator arrangement for an electric motor.The object according to the invention is achieved by a stator arrangement for an electric motor having the features of the independent device claim, in particular from the characterizing part, by an electric motor having a corresponding stator arrangement according to the independent device claim arranged in the subordinate paragraph, and by a method for producing a stator arrangement for an electric motor having the features of the independent method claim, in particular from the characterizing part. Preferred developments of the invention are set forth in the dependent claims. Features disclosed with respect to the individual aspects of the invention can be combined with one another in such a way that with respect to the disclosure with respect to the aspects of the invention, mutual reference is always made.The invention provides a stator arrangement for an electric motor, having: a stator body in the form of a cylinder shell having a plurality of substantially axially aligned receiving grooves on an inner side of the stator body, a plurality of electrically conductive plug-in needles, which each have a bending side and two limbs which lead away from the bending point and open to a twist side of the plug-in needles, wherein the limbs of the plug-in needles are received in the receiving grooves of the stator body from the bending side to the twist side, wherein at least three layers, as seen in a radial direction of the stator body, are formed by the limbs of the plug-in needles in the receiving grooves, wherein at least two limbs of the plug-in needles are arranged in contact with one another in each layer in the receiving grooves, and wherein the limbs of different plug-in needles are electrically interconnected to one another on the twist side. For this purpose, it is provided according to the invention that on the twist side the legs of the needles of the same position are rotated in different (tangential or azimuthal) directions and the legs of the adjacent needles between different positions are rotated in the same (tangential or azimuthal) direction. The directions on the twist side are defined as tangential or azimuthal directions with respect to the cross-sectionally circular position from which the pins come out of the stator body.A stator arrangement can be used within the scope of the invention for high-voltage applications of up to 800 V, preferably in electric motors of electric vehicles. The stator body within the scope of the invention serves as a supporting body for a basket comprising a plurality of twisted and electrically connected pins. The receiving grooves can be aligned substantially axially, wherein receiving grooves formed obliquely are also conceivable in principle. In the receiving grooves, the legs of the plug needles rest one above the other-preferably in three layers-and form turns of one of preferably three coils within the stator arrangement. Each layer can be formed by two or more legs. Advantageously, three coils can be formed by the needles. Thus, the stator assembly can be operated with three phases. At the bending points of the plug needles, a winding head is formed which protrudes from the stator body at the end face. The bending points serve to accommodate the legs of the plug needles at different depths in the receiving grooves in order to enable the plug needles to be wound into turns.The concept of the invention is to provide such a winding scheme in which, viewed radially, fewer wire intersections are present in the winding head (i.e. fewer changes in the bending directions due to different plug-in needles). The invention recognizes here that fewer wire intersections in the winding head result in less potential difference being formed in the winding head and between the adjacent legs in the receiving grooves. In order nevertheless to enable a winding scheme, preferably in the form of a star connection, although fewer wire crossing points are available in the winding head, the invention proposes to rotate the legs of the needles of the same layer in different directions and the adjacent legs of the needles between different layers in the same direction on the twist side. An advantageous stator arrangement can thus be provided in which the potential difference between adjacent limbs of the plug-in needles is reduced. Consequently, safe operation of the stator assembly can be enabled. At the same time, the stator arrangement according to the invention provides a simple and easily producible winding scheme. The stator arrangement according to the invention can thus be produced easily and cost-effectively.Furthermore, in a stator arrangement, the invention can provide that the plug needles of at least one layer of the at least three layers are bent in the same direction (here the radial is meant) on the bending side (i.e. in the winding head). The bends take place within the scope of the invention radially inward or radially outward, so that the legs of the plug needles can be accommodated at different depths in the receiving grooves in order to enable the plug needles to be wound into turns of a coil. Because the plug-in needles of at least one layer of the at least three layers are bent in the same (radial) direction on the bending side, not only can the number of bending points, so-called wire intersections, in the winding head be reduced and thus the potential difference in the winding head, but also the mounting of the plug-in needles within the stator body be simplified. The plug needles of at least one layer can thus be handled together, whereby the number of assembly steps when the stator body is fitted can likewise be reduced.Furthermore, the invention can provide in a stator arrangement that the pins of a first layer are bent in the same (radial) direction on the bending side and the pins of a second layer of the at least three layers are bent in the same direction on the bending side. The assembly of the plug needles within the stator body can thus be simplified even further.Furthermore, it is conceivable that the needles of a first layer and a second layer of the at least three layers are bent in different (radial) directions on the bending side between the first layer and the second layer. In other words, both needles of the first layer in the winding head can be wound with the two needles of the second layer. In this way, the production of windings can be facilitated, wherein at the same time the number of bending points, so-called wire intersections, in the winding head is reduced. Thus, the needles of the first layer and the second layer of the at least three layers can form a first (for example coarse) winding pattern within the stator arrangement.In addition, the invention can provide in a stator arrangement that the plug needles of at least one layer are bent in different (radial) directions on the bending side. Thus, by means of the at least one, preferably third, layer of the at least three layers, a second (for example fine) winding pattern can be provided within the stator arrangement. This layer can advantageously be provided on an opening side of the receiving grooves.Furthermore, in a stator arrangement, the invention can provide that the pins of a third layer of the at least three layers are bent in different (radial) directions on the bending side, and / or that the adjacent pins of a third layer and a second layer of the at least three layers are bent in the same direction on the bending side. In this way, the advantage can be achieved that two different winding schemes can be realized within the stator arrangement.Furthermore, the invention can provide in a stator arrangement that at least three plug needles arranged in an additional arrangement are bent in the same (radial) direction on the bending side.Thus, not only can the number of bending points, so-called wire intersections, in the winding head be reduced, but also a joining together of different winding schemes can be made possible.Furthermore, in a stator arrangement, the invention can provide that the receiving grooves have a substantially U-shaped cross section, as seen in the cross section of the stator body. Thus, the accommodation of plug needles in and the production of coils on the stator body can be made possible. Preferably, the receiving grooves may be radially oriented and have an opening side that opens inwardly with respect to the stator body.In addition, in a stator arrangement, the invention can provide that the receiving grooves have a groove-shaped contour, as seen in the cross section of the stator body. Within the grooves, the legs of the needles can be received almost positively. Thus, a stable stator assembly can be produced. In addition, the mounting of the needles in the receiving grooves can be designed intuitively by the legs of the needles being able to be inserted into predetermined grooves of the receiving grooves. Assembly errors can thereby be significantly reduced.In addition, in a stator arrangement, the invention can provide that the legs of the plug needles are wound around with an insulation paper in the receiving grooves. As a result, not only the insulation of the needles can be provided, but also a protected mounting of the needles in the receiving grooves can be made possible, in that the insulation paper protects the needles from damage during the insertion into the receiving grooves.Furthermore, in a stator arrangement, the invention can provide that at least one layer of the legs is wound around with an insulation paper. The plug needles of at least one layer can thus be insulated separately. In the event that potential differences arise between the layers, these can be shielded in a targeted manner.Furthermore, in a stator arrangement, the invention can provide that an insulation paper for the plug-in needles has an overlap region which is arranged on an opening side of the receiving grooves, on a base side of the receiving grooves or between the limbs of the different layers of the at least three layers. If the overlapping portion of the insulation paper is provided on the opening side of the accommodation grooves, it enables particularly easy attachment of the insulation paper. If the overlapping portion of the insulation paper is provided on the bottom side of the receiving grooves, it enables the overlapping portion to be attached in a protected manner. If the overlap region of the insulation paper is arranged between the limbs of the different layers of the at least three layers, it makes it possible to insulate the layers from one another.Furthermore, in a stator arrangement, the invention can provide that the pins have a winding pattern in the manner of a star connection. Such a winding scheme is simple and cost-effective to produce and reliable in operation.Advantageously, at least one single-leg needle can be provided in order to complete a (desired) winding pattern by the plug-in needles. In this way, the completion of the winding pattern can be facilitated. Within the scope of the invention, it is furthermore conceivable for the electrical connections to be provided either on the head side of the stator body (i.e. on the winding head or on the bending side of the needles) or on the twist side of the stator body (i.e. on the twist side of the needles).In addition, in a stator arrangement, the invention can provide that the (or at least most) needles have the same span between the legs within the same position. Thus, the fitting of the stator body with the plug needles can be simplified.It is also conceivable for the needles to have the same or different span widths between the legs within different positions. In this way, it can be made possible with simple means that a specific winding pattern or two different winding patterns is or are made possible within the stator arrangement.Furthermore, in a stator arrangement, the invention can provide for at least one special needle to be provided, which extends between different layers. With the aid of such special needles, interconnection of different layers can be made possible.Furthermore, in a stator arrangement, the invention can provide that the pins of different layers have cross sections of different sizes and / or shapes. Advantageously, the needles at the innermost layer closest to the opening side of the receiving grooves can have a smaller diameter than the diameter of the lower needles. In other words, the invention can provide that the pins of a third layer of the at least three layers, which faces the opening side of the receiving grooves, have a smaller diameter than the diameter of the pins of the layers lying lower in the receiving grooves. Thus, eddy currents in the vicinity of the opening side of the accommodation grooves can be reduced.Furthermore, the invention provides an electric motor with a stator arrangement which can be implemented as described above. With the aid of the electric motor within the scope of the invention, the same advantages are achieved that have been described above in connection with the stator arrangement according to the invention. These advantages are referred to in the present case in their entirety.In addition, the invention provides a method for producing a stator arrangement for an electric motor, having the following steps: providing a stator body in the form of a cylinder shell having a plurality of substantially axially aligned receiving grooves on an inner side of the stator body, providing a plurality of electrically conductive plug needles, which each have a bending side and two limbs which lead away from the bending point and open to a twist side of the plug needles, receiving the limbs of the plug needles in the receiving grooves of the stator body from the bending side to the twist side, wherein at least three layers, as seen in a radial direction of the stator body, are formed in the receiving grooves by the limbs of the plug needles, wherein at least two limbs of the plug needles are arranged in contact with one another in each layer in the receiving grooves, and wherein the legs of different needles are electrically interconnected on the twist side. For this purpose, it is provided according to the invention that on the twist side the legs of the needles of the same layer are twisted in different directions and the adjacent needles between different layers are twisted in the same direction. With the aid of the method within the scope of the invention, the same advantages are achieved that have been described above in connection with the stator arrangement according to the invention. These advantages are referred to in the present case in their entirety.Further measures which improve the invention are illustrated in more detail below with the description of the preferred exemplary embodiments of the invention on the basis of the figures. The features mentioned in the claims and in the description can be essential to the invention individually or in any combination. It should be noted that the figures have only descriptive character and are not intended to limit the invention in any form. It shows: FIG. 1 shows a schematic illustration of a stator arrangement according to the invention in a plan view of a bending side of the stator arrangement, FIG. 2 shows a schematic illustration of a stator arrangement according to the invention in a plan view of a twist side of the stator arrangement, FIG. 3 shows a schematic illustration of a winding scheme according to the invention, FIG. 4 shows a schematic illustration of a basket according to the invention made of twisted and interconnected plug-in needles, FIG. 5 shows a schematic illustration of electrical connections on a stator arrangement according to the invention in a plan view of a bending side of the stator arrangement, FIG. 6 shows a circuit diagram of a stator arrangement according to the invention, and FIG. 7 shows a cross section of a receiving groove of a stator arrangement according to the invention.In the various figures, the same technical features are denoted by the same reference numerals, wherein, as a rule, one technical feature is described only once.FIGS. 1 to 5 show a stator arrangement 100 for an electric motor, for example for an electric vehicle. The stator arrangement 100 has a stator body 10 which is substantially in the form of a cylinder jacket and has a plurality of substantially axially aligned receiving grooves 11 on an inner side of the stator body 10. In addition, the stator arrangement 100 has a plurality of electrically conductive needles 20, each of which has a bending side B and two limbs 21, which lead away from the bending point B and open to a twist side T of the needles 20. The legs 21 of the plug needles 20 are accommodated in the accommodation grooves 11 of the stator body 10 from the bending side B to the twisting side T. Viewed in a radial direction of the stator body 10, three layers 1, 2, 3 are formed in the receiving grooves 11 by the legs 21 of the plug needles 20.As can be seen from FIGS. 1 to 3, in each layer 1, 2, 3 in the receiving grooves 11 two legs 21 of the needles 20 are arranged lying against one another. In principle, however, it is also conceivable within the scope of the invention that in particular the lower layers 1, 2, 3, such as e.g. a second layer 2 and / or a third layer 3, are formed by a plurality of limbs 21, e.g. four, six or more.As is also shown in FIGS. 2 and 3, the legs 21 of different needles 20 are electrically connected to one another on the twist side T of the needles 20 (which corresponds to the twist side T of the stator arrangement 100 and the head side of the stator body 10), for example by welding (cf. FIGS. 2 and 3 ).The stator arrangement 100 according to the invention provides that on the twist side T the legs 21 of the needles 20 of the same layer 1, 2, 3 are twisted in different (axial or azimuthal) directions and the legs 21 of the adjacent needles 20 between different layers 1, 2, 3 are twisted in the same (axial or azimuthal) direction. The directions are defined as tangential or azimuthal directions with respect to the layer 1, 2, 3 which is circular in cross section.Within the scope of the invention, it is conceivable for the stator body 10 to be equipped with the plug needles 20. It is furthermore conceivable for the plug needles 20 to be initially braided together to form a so-called basket which is inserted into the stator body 10 as a part which can be handled individually. The basket is shown in isolation in FIG. 4. By winding and interconnecting the needles 20, three coils are formed by the needles 20, wherein in principle a larger number of coils is also conceivable. Thus, the stator assembly 100 may be operated with at least three phases. At the bending points B of the needles 20, a winding head is formed which protrudes from the stator body 10 at the end face. Within the scope of the invention, the needles 20 can form a winding pattern, preferably in the form of a star connection (cf. FIG. 4 ).Advantageously, the invention makes it possible for fewer wire intersections (i.e. fewer changes in the bending directions) to be formed in the winding head, because the entanglements under the needles 20 are made possible on the twist side T of the needles 20. Fewer wire intersections in the winding head form less potential difference in the winding head and between the adjacent legs 21 of the plug-in needles 20 in the receiving grooves 11. see FIG. 6, which shows the invention by way of example 48 (forty-eight) receiving grooves 11 on the stator body 10. The upper table of FIG. 6 shows the individual legs 21 within the receiving grooves 11 which are arranged in three layers 1, 2, 3. The respective beginning E1 of one of three coils is marked E1 and the respective end E2 of one of three coils is marked E2. The wires operating at the same phase are deposited with the same shading in Figure 6. The lower table of FIG. 6 shows the potential differences between the individual legs 21, which, for the purposes of the invention, are significantly reduced in comparison with known stator arrangements.As is also shown in FIGS. 1 and 3, the needles 20 of a first layer 1 are bent in the same (radial) direction on the bending side B and the needles 20 of a second layer 2 are bent in the same (radial) direction on the bending side B.The first layer 1 in the sense of the invention is referred to as the layer which bears against a bottom side A 2 of the receiving grooves 11. In the middle of the receiving grooves 11 (viewed radially with respect to the stator body 10), the second layer 2 lies within the meaning of the invention. The layer adjoining an opening side A 1 of the receiving grooves 11 is referred to as the third layer 3 in the sense of the invention.Furthermore, FIGS. 1 and 3 show that the needles 20 of the first layer 1 and the second layer 2 are bent in different (radial) directions on the bending side B between the first layer 1 and the second layer 2.In addition, FIGS. 1 and 3 show that the needles 20 of the third layer 3 are bent in different (radial) directions on the bending side B. In addition, the adjacent needles 20 of the third layer 3 and of the second layer 2 are bent in the same direction (radial). Overall, three needles 20 arranged in side-by-side (both needles 20 of the second layer 2 and the inner needle 20 of the third layer 3) are bent in the same (radial) direction on the bending side B. In this way, the number of bending points, so-called wire intersections, in the winding head can be reduced and it is possible to join different winding schemes within the stator arrangement 100. A first winding pattern is realized in the first two layers 1, 2 and a second winding pattern is realized in the third layer 3.As can be seen from FIGS. 4 and 5, a single-leg needle 30 can be provided within the scope of the invention in order to complete a winding pattern through the plug-in needles 20. As is also shown in FIG. 5, the electrical connections E can be provided on the head side of the stator body 10 (i.e. on the winding head or on the bending side B of the plug needles 20). In this way, a simple interconnection of the stator arrangement 100 can be made possible, for example with the aid of simple cable lugs.Within the scope of the invention, it is conceivable that the (or at least most) needles 20 can have the same span between the legs 21 within the same position 1, 2, 3. For example, the span of the needles 20 of the third layer 3 can comprise five or seven grooves and the span of the needles 20 of the first layer 1 and of the second layer 2 can comprise, for example, six grooves. Furthermore, at least one special needle 31 can be provided, which connects different layers 1, 2, 3 to one another.As is also shown in FIG. 7, the receiving grooves 11 can have a substantially U-shaped cross section, as seen in the cross section of the stator body 10. In addition, it is conceivable that the receiving grooves 11 can have a groove-shaped contour, as seen in the cross section of the stator body 10, in order to be able to hold the legs 21 of the plug needles 20 in position better at the provided location.In addition, FIG. 7 shows that the legs 21 of the plug-in needles 20 are wound around in the receiving grooves 11 with an insulation paper 22. The insulation paper 22 can protect the pins 20 during mounting in the receiving grooves 11. In principle, it is conceivable for the insulation paper 22 for the plug-in needles 20 to have an overlap region 23, which is arranged on the opening side A 1 of the receiving grooves 11, on the bottom side A 2 of the receiving grooves 11 (shown in FIG. 7 ) or between the limbs 21 of the different plies 1, 2, 3 (preferably between the second ply 2 and the third ply 3).Furthermore, FIG. 7 shows that the needles 20 of different layers 1, 2, 3 can have cross sections of different sizes and / or shapes. It is conceivable, for example, for the needles 20 of the first layer 1 and the needles 20 of the second layer 2 to have a square cross section. The needles 20 of the third layer 3 can have, for example, a smaller, in particular flatter, cross section than the cross section of the needles 20 of the first layer 1 and of the second layer 2.The above description of the figures describes the present invention solely in the context of examples. Of course, individual features of the embodiments can be freely combined with one another, provided that it is technically expedient, without departing from the scope of the invention.List of reference characters100 Stator arrangement 10 Stator body 11 Receiving groove 20 Plug-in needle 21 Leg 22 Insulation paper 23 Overlap region 30 Single-leg needle 31 Special needle 1 Layer, first layer 2 Layer, second layer 3 Layer, third layer A 1 Opening side A 2 Base side B Bending side T Twist side E Electrical connection E 1 Beginning of a coil E 2 End of a coil

Claims

Stator arrangement (100) for an electric motor, having: a stator body (10) in the form of a cylinder shell with a plurality of axially aligned receiving grooves (11) on an inner side of the stator body (10), a plurality of electrically conductive plug-in needles (20), which each have a bending side (B) and two limbs (21) which lead away from the bending point (B) and open to a twist side (T) of the plug-in needles (20), wherein the limbs (21) of the plug-in needles (20) are received in the receiving grooves (11) of the stator body (10) from the bending side (B) to the twist side (T), wherein at least three layers (1, 2, 3) are formed by the limbs (21) of the plug-in needles (20), as seen in the receiving grooves (11) in a radial direction of the stator body (10), wherein in each layer (1, 2, 2, 3) in the receiving grooves (11), at least two legs (21) of the needles (20) are arranged lying against one another, and wherein the legs (21) of different needles (20) are electrically interconnected to one another on the twist side (T), wherein on the twist side (T) the legs (21) of the needles (20) of the same layer (1, 2, 3) are twisted in different directions and the legs (21) of the adjacent needles (20) are twisted in the same direction between different layers (1, 2, 3), characterized in that the needles (20) of at least one layer (1, 2, 3) of the at least three layers (1, 2, 3) are bent in the same direction on the bending side (B) and / or that the needles (20) of at least one layer (1, 2, 3) are bent in different directions on the bending side (B), wherein the bends take place radially inward or radially outward, so that the legs (21) of the plug needles (20) are received at different depths in the receiving grooves (11).Stator arrangement (100) according to Claim 1, characterized in that the needles (20) of a first layer (1) are bent in the same direction on the bending side (B) and the needles (20) of a second layer (2) of the at least three layers (1, 2, 3) are bent in the same direction on the bending side (B), and / or in that the needles (20) of a first layer (1) and a second layer (2) of the at least three layers (1, 2, 3) are bent in different directions on the bending side (B) between the first layer (1) and the second layer (2).Stator arrangement (100) according to one of the preceding claims, characterized in that the pins (20) of a third layer (3) of the at least three layers (1, 2, 3) on the bending side (B) are bent in different directions, and / or in that the adjacent pins (20) of a third layer (3) and of a second layer (2) of the at least three layers (1, 2, 3) on the bending side (B) are bent in the same direction.Stator arrangement (100) according to one of the preceding claims, characterized in that three plug needles (20) arranged in an adjacent arrangement, consisting of both plug needles 20 of the second layer 2 and the inner plug needle 20 of the third layer 3, are bent in the same direction on the bending side (B).Stator arrangement (100) according to one of the preceding claims, characterized in that the receiving grooves (11) have a substantially U-shaped cross section as seen in the cross section of the stator body (10), and / or in that the receiving grooves (11) have a groove-shaped contour as seen in the cross section of the stator body (10).Stator arrangement (100) according to one of the preceding claims, characterized in that the limbs (21) of the plug-in needles (20) are wound around in the receiving grooves (11) with an insulation paper (22), and / or in that at least one layer (1, 2, 3) of the limbs (21) is wound around with an insulation paper (22), and / or in that an insulation paper (22) for the plug-in needles (20) has an overlap region (23) which is arranged on an opening side (A1) of the receiving grooves (11), on a base side (A2) of the receiving grooves (11) or between the limbs (21) of the different layers (2, 3) of the at least three layers (1, 2, 3).Stator arrangement (100) according to one of the preceding claims, characterized in that the needles (20) have a winding pattern in the manner of a star connection, and / or in that at least one single-leg needle (30) is provided in order to complete a winding pattern by the needles (20).Stator arrangement (100) according to one of the preceding claims, characterized in that the plug-in needles (20) within the same layer (1, 2, 3) have the same span between the limbs (21), and / or the plug-in needles (20) within different layers (1, 2, 3) have the same or different spans between the limbs (21), and / or in that at least one special needle (31) is provided which extends between different layers (1, 2, 3).Stator arrangement (100) according to one of the preceding claims, characterized in that the plug-in needles (20) of different layers (1, 2, 3) have cross sections of different sizes and / or shapes, and / or in that the plug-in needles (20) of a third layer (3) of the at least three layers (1, 2, 3) which faces an opening side (A1) of the receiving grooves (11) have a smaller diameter than the diameter of the plug-in needles (20) of the layers (1, 2) lying lower in the receiving grooves (11).Electric motor having a stator arrangement (100) according to one of the preceding claims.Method for producing a stator arrangement (100) for an electric motor, having the following steps: providing a stator body (10) in the form of a cylinder shell with a plurality of axially aligned receiving grooves (11) on an inner side of the stator body (10), providing a plurality of electrically conductive plug-in needles (20) which each have a bending side (B) and two limbs (21) which lead away from the bending point (B) and open to a twist side (T) of the plug-in needles (20), receiving the limbs (21) of the plug-in needles (20) in the receiving grooves (11) of the stator body (10) from the bending side (B) to the twist side (T), wherein at least three layers (1, 2, 3) are formed in the receiving grooves (11) by the limbs (21) of the plug-in needles (20), as seen in a radial direction of the stator body (10), wherein at least two legs (21) of the needles (20) are arranged in each layer (1, 2, 3) in the receiving grooves (11) so as to abut each other, and wherein the legs (21) of different needles (20) are electrically interconnected to each other on the twist side (T), wherein on the twist side (T) the legs (21) of the needles (20) of the same layer (1, 2, 3) are twisted in different directions and the legs (21) of the adjacent needles (20) are twisted in the same direction between different layers (1, 2, 3), characterized in that the needles (20) of at least one layer (1, 2, 3) of the at least three layers (1, 2, 3) are bent in the same direction on the bending side (B) and / or that the needles (20) of at least one layer (1, 2, 3) are bent in the same direction, 3) on the bending side (B) are bent in different directions, wherein the bends take place radially inward or radially outward, so that the legs (21) of the plug needles (20) are received at different depths in the receiving grooves (11).

Images