Stator of an electric machine

Abstract

The invention describes a stator (110) of an electric machine (100), in particular a permanent magnet synchronous machine, comprising: a plurality of stator segments (S1, S2) arranged circumferentially adjacent to one another to form an annular structure covering the entire circumference; each stator section (S1, S2) has a plurality of teeth (115), a plurality of slots (116) between the teeth, and a multi-phase winding set (117), in particular exactly one multi-phase winding set, arranged at least partially in the slots; wherein the stator sections are grouped into at least two stator section groups; wherein the winding sets of each of the groups of stator segments are connected in parallel to each other; wherein each stator segment (S1, S2) in any stator segment group considered has at least one stator segment arranged directly circumferentially adjacent to one another, said stator segment belonging to another stator segment group different from the stator segment group considered.

Description

Technical Field

[0001] The present invention relates to a stator of a motor, to a motor, in particular to a permanent magnet synchronous motor, and further to a wind turbine comprising the motor. Background Art

[0002] In large multi-system electric machines (with multiple winding sets or multiple converters), the stator is often segmented circumferentially to simplify production, transportation, and maintenance. Thus, multiple stator segments are circumferentially arranged adjacent to one another to form an annular structure that forms the entire circumference. Furthermore, the stator windings can be electrically divided into two or more electrical systems. This often results in design decisions based on the segment layout for each electrical system. Conventional generators may, for example, have a quadrant layout, in which the winding sets belonging to one system are arranged to form a quadrant by, for example, arranging three stator segments, wherein the windings of the stator segments are adjacent to one another. For example, three stator segments, one system per quadrant, may be provided, for a total of twelve segments for the entire stator.

[0003] However, it has been observed that conventional multi-stator segment electric machines may have problems, particularly when one or more of the winding systems fail.

[0004] Therefore, there may be a need for a stator of an electrical machine, an electrical machine and a wind turbine, wherein reliable and safe operation may be improved or ensured, in particular when one or more winding sets or converters connected to or included in the electrical machine fail, in particular in the presence of a short circuit. Summary of the Invention

[0005] Said need is met by the subject matter according to the independent claim. Advantageous embodiments of the invention are described by the dependent claims.

[0006] According to an embodiment of the present invention, a stator of an electric machine is provided, wherein the electric machine is particularly a permanent magnet synchronous machine, wherein the stator comprises: a plurality of stator segments, wherein the stator segments are arranged adjacent to each other circumferentially to form an annular structure covering the entire circumference; each stator segment has a plurality of teeth, wherein a plurality of slots are provided between the teeth, and a multi-phase winding set is provided which is at least partially arranged in the slots (and substantially fills the slots), and in particular, has exactly one multi-phase winding set; wherein the stator segments are grouped into at least two stator segment groups; wherein the The winding sets of each group of stator segment groups (e.g., S1, S2, S3, S4) are connected in parallel to each other; wherein each stator segment in any considered stator segment group has at least one stator segment arranged directly circumferentially adjacent, said stator segment belonging to another stator segment group different from the considered stator segment group; wherein any one of the following optional (exclusive) features (A), (B), (C) holds true (i.e., (A) is exclusively satisfied / applied or (B) is exclusively satisfied / applied or (C) is exclusively satisfied / applied):

[0007] (A) each stator segment (S1, S2, S3, S4) of any considered stator segment group has two stator segments arranged directly circumferentially adjacent to each other, said stator segments belonging to one or more stator segment groups different from the stator segment group considered; wherein the number of stator segment groups is four; wherein each stator segment (S1, S2, S3, S4) of any considered stator segment group has two stator segments arranged directly circumferentially adjacent to each other, said two stator segments belonging to one or more stator segment groups different from the stator segment group considered, in particular to two different stator segment groups;

[0008] (B) the number of stator segment groups is four; wherein each stator segment (S1, S2, S3, S4) of any considered stator segment group has: one stator segment arranged directly circumferentially adjacent, said stator segment belonging to a stator segment group different from the considered stator segment group; and one stator segment arranged directly circumferentially adjacent, said stator segment belonging to the considered group;

[0009] (C) The number of the stator segment groups is six or more, wherein the number of segments is a multiple of the number of the stator segment groups, in particular 12, 16, 20, 24 or more.

[0010] The stator may be an internal stator. The stator segments may each span an (angular) portion of the entire circumference or a portion of an annular structure, for example covering an angular range of, for example, between 10° and 90°. Each of the stator segments may comprise, for example, exactly one multi-phase winding set (or, in other embodiments, two or more multi-phase winding sets). However, according to a particular embodiment, each of the stator segments comprises exactly one winding set, for example a three-phase winding set, which substantially covers or fills all slots of the stator segment in question.

[0011] The stator segments can be grouped into two, three, four or even more segment groups, for example. Each stator segment group is also referred to as forming an "electrical system." Each stator segment group can provide multi-phase electrical power, in particular three-phase electrical power, during operation.

[0012] The stator segments of the considered stator segment groups can be arranged at different circumferential positions and can, in particular, be spaced apart so that the stator segments of each considered stator segment group are avoided or reduced from being arranged directly adjacent to each other. If at least one stator segment of a considered stator segment group fails or malfunctions (e.g., short-circuits the winding set of the corresponding stator segment), the entire stator segment group may fail or may be inoperable due to the parallel connection. However, if one of the stator segment groups fails or malfunctions, the electric machine may still be able to continue operating using the remaining functioning stator segment groups.

[0013] In a conventional stator, in the event of an internal or external short circuit, the air gap attraction between the rotor and stator across the shorted segment can be significantly increased compared to the segment in a healthy or properly functioning condition. Consequently, in these areas, the rotor will typically move away from the stator. Due to the conventional quadrant layout of a segmented stator, the two healthy quadrants may see a reduction in air gap due to the elliptical deformation of the rotor. Traditionally, the elliptical deformation of the rotor can exert increased forces on the rotor structure, thereby either requiring a more robust structure (range and weight), a larger air gap (lower performance), or resulting in potential damage.

[0014] According to embodiments of the present invention, elliptical deformation of the rotor is reduced, allowing the operation of the electric machine to be maintained or continued even in the event of a short circuit in the electrical system, that is, in the event of a failure in one of the stator segment groups or the converter system. Due to the configuration and design of the stator, and in particular the arrangement of the stator segments, embodiments of the present invention avoid or reduce elliptical deformation of the rotor of the electric machine.

[0015] When for each stator segment of any considered stator segment group at least one stator segment different from the considered stator segment group is arranged directly circumferentially adjacent, said elliptical deformation may be reduced when one stator segment of the stator segment group fails or malfunctions.

[0016] Two considered stator segments may be “arranged immediately circumferentially adjacent” when the two considered stator segments do not have any other stator segments in the circumferential direction between the two considered stator segments.

[0017] In particular, the stator segments may be arranged alternately, in the sense that a stator segment of a stator segment group under consideration is arranged directly circumferentially adjacent to a stator segment of a stator segment group different from the stator segment group under consideration. There may not be any stator segment of a stator segment group under consideration that does not have at least one stator segment of the group under consideration arranged directly circumferentially adjacent thereto.

[0018] By using a sequential arrangement of the system / segment layout, the forces acting on the rotor and / or stator can be more balanced and distributed during single or multiple system short circuits.

[0019] According to an embodiment of the invention, each stator segment in any considered group of stator segments has two stator segments arranged directly circumferentially adjacent, which two stator segments belong to one or more stator segment groups different from the considered group of stator segments.

[0020] This embodiment can be implemented, for example, when the number of stator segment groups is two or four. Thus, on both circumferential sides of each stator segment of any given stator segment group, two stator segments are arranged, each belonging to another group or two other groups, each of which is different from the given stator segment group. In this embodiment, no stator segment of any given stator segment group has a stator segment directly adjacent to it that belongs to the same given stator segment group. This improves the ability to further avoid or reduce elliptical deformations.

[0021] According to an embodiment of the invention, the number of stator segment groups is two; wherein each stator segment in any considered stator segment group has two stator segments different from the considered stator segment group that are arranged directly circumferentially adjacent.

[0022] Thus, for example, embodiments of the invention support stators with exactly two stator segment groups, and other embodiments support stators with, for example, exactly four stator segment groups. Thus, a great deal of flexibility can be provided.

[0023] According to an embodiment of the invention, the number of stator segment groups is four; wherein each stator segment in any considered stator segment group has two stator segments arranged directly circumferentially adjacent, said two stator segments belonging to one or more stator segment groups different from the considered stator segment group, in particular to two different stator segment groups.

[0024] The two stator segments of one or more groups may belong to one stator segment group or may belong to two different stator segment groups, each of which is different from the stator segment group under consideration.Thereby, a great flexibility can be provided for the stator design.

[0025] According to an embodiment of the invention, the number of stator segment groups is four; wherein each stator segment of any considered stator segment group has: one stator segment arranged directly circumferentially adjacent, which stator segment belongs to a stator segment group different from the considered stator segment group, and one stator segment arranged directly circumferentially adjacent, which stator segment belongs to the considered group.

[0026] In this embodiment, for example, two stator segments belonging to the same (considered) stator segment group are arranged directly adjacent to each other circumferentially. In this embodiment as well, elliptical deformation of the stator and / or rotor can be reduced even in the event of a failure of a stator segment or a failure of the corresponding stator segment group.

[0027] According to an embodiment of the invention, the stator further comprises a plurality of busbars, in particular multiphase busbars, at least one busbar being provided for each stator segment group; wherein the winding sets of each group of stator segment groups are connected in parallel to each other using the busbars.

[0028] The busbar can be arranged in a radially centrally located region of the stator, i.e., in a radially inner portion of the stator. This embodiment may be particularly suitable for an electric machine having an inner stator and an outer rotor. The busbar may, in particular, include one electrical conductor for each phase. Thus, the busbar may include an electrically conductive material for effectively electrically connecting the winding segments of all stator segments belonging to a stator segment group. This parallel connection may increase the power generation capacity of the electric machine during operation. The busbar may, for example, cover or span an annular segment having an angular range of between 45° and 180°.

[0029] According to an embodiment of the present invention, the stator further comprises two or more terminal boxes, to each of which some of the winding sets and / or busbars are connected.

[0030] The terminal box may allow connecting winding sets connected in parallel to a plurality of converters, wherein one or more converters may be provided for each stator segment group.

[0031] According to an embodiment of the invention, the stator further comprises a plurality of converters, whereby at least one converter is provided for each stator segment group, wherein the winding set of each stator segment group is connected to an associated converter; wherein, in particular, the number of stator segment groups is equal to the number of converters.

[0032] Each converter may include an AC / DC converter section, a DC link, and a DC / AC converter section. The AC / DC or DC / AC converter section may each include a plurality of controllable switches, such as power transistors, which may be operated or switched by providing or supplying appropriate gate drive signals to the gates of the power switches or power transistors.

[0033] Depending on the capacity or rating of the converter, the winding sets of one stator segment group are connected to either one converter or to a plurality of converters.

[0034] According to an embodiment of the present invention, the winding sets of different stator segment groups are disconnected from each other. As a result, the different winding sets of different stator segment groups can operate independently of each other. Consequently, even if one winding set of one stator segment group (or a connected converter) fails, the winding sets of other stator segment groups can continue to operate, thereby still generating electrical energy, for example, in a wind turbine.

[0035] According to embodiments of the present invention, the coils of one winding set per stator segment are arranged in slots according to a centralized or distributed winding topology, and / or the coils of the winding set per stator segment are connected to each other in parallel and / or in series for at least one phase, and / or the conductors of different phases of each winding set are connected at a common connection point (e.g., a star point). This provides significant flexibility and can also support conventional winding topologies and connection methods.

[0036] According to an embodiment of the present invention, the number of stator segment groups is two, four, six, or more, wherein the number of segments is a multiple of the number of stator segment groups, in particular 12, 16, 20, 24, or more. This allows for a wide variety of stator designs.

[0037] According to an embodiment of the present invention, an electric machine, in particular a permanent magnet synchronous machine, is provided, comprising: a stator according to one of the preceding embodiments; a rotor, in particular an external rotor, rotatably mounted relative to the stator; in particular for each stator segment group, a converter connectable or connected to the winding set of the corresponding stator segment group.

[0038] The rotor may have a plurality of permanent magnets mounted thereon along a circumferential direction. An air gap may exist between the radially inner surface of the plurality of magnets and the radially outer surface of the stator. Due to the stator design, elliptical deformation of the rotor and / or stator during operation can be avoided or reduced, for example, when one or more winding sets of one or more specific stator winding sets fail, in particular when a short circuit occurs.

[0039] According to an embodiment of the invention, the electric machine is configured to operate when at least one stator segment group fails, in particular due to a short circuit condition. In such a partial failure condition, the air gap size may only slightly deviate from the desired or designed air gap size.

[0040] According to an embodiment of the present invention, there is provided a wind turbine including the electric machine according to the aforementioned embodiment as a generator.

[0041] The aspects defined above and further aspects of the invention emerge from the examples of embodiment to be described hereinafter and are explained with reference to these examples of embodiment.The invention will be described in more detail hereinafter with reference to these examples of embodiment but to which the invention is not limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Embodiments of the present invention will now be described with reference to the accompanying drawings. The present invention is not limited to the illustrated or described embodiments.

[0043] Figure 1 A motor according to an embodiment of the present invention is schematically illustrated;

[0044] Figure 2 A wind turbine according to an embodiment of the present invention is schematically illustrated;

[0045] Figure 3 Explain the traditional electric motor;

[0046] Figure 4 Two embodiments of an electric machine are schematically described;

[0047] Figure 5 Schematically illustrating a motor according to an embodiment of the present invention, the motor having a special busbar configuration;

[0048] Figure 6 schematically illustrates a motor according to an embodiment of the present invention; and

[0049] Figure 7 An electric machine according to an embodiment of the present invention is schematically illustrated, the electric machine having a special busbar configuration. DETAILED DESCRIPTION

[0050] The illustrations in the drawings are schematic. It should be noted that in different drawings, structurally and / or functionally similar or identical elements are given the same reference numerals or reference numerals that differ only in the first digit. For descriptions of elements not described in one embodiment, reference can be made to the description of the elements in another embodiment.

[0051] Figure 1 The electrical machine 100 schematically illustrated in FIG. 1 (seen in an axial direction 101 , which is perpendicular to the circumferential direction 102 and perpendicular to the radial direction 103 ) comprises a stator 110 according to an embodiment of the invention and further comprises a rotor 105 rotatably mounted relative to the stator 110 .

[0052] The rotor 105 has a plurality of magnets 106 which are mounted or arranged circumferentially adjacent to one another. Figure 1 Only some of the magnets 106 are illustrated in FIG. 1 , but the magnets 106 are installed over the entire circumference of the rotor 105 .

[0053] The stator 110 of the motor 100 includes a plurality of stator segments S1, S2 (in Figure 1 In the embodiment illustrated in FIG, six stator segments S1 and six stator segments S2 are arranged circumferentially adjacent to each other to form an annular structure covering the entire circumference. Each stator segment S1, S2 has a plurality of teeth 115 with a plurality of slots 116 between the teeth, and a multi-phase winding set 117 arranged at least partially in the slots 116. The stator segments, namely, the six stator segments S1 and the six stator segments S2, are grouped into at least two stator segment groups, namely, a first group including all stator segments S1 and a second group including all stator segments S2.

[0054] The winding sets of each stator segment S1 are connected in parallel using electrical conductors 118 (which may also be configured as busbars). Figure 1 In the embodiment illustrated in FIG, each first stator segment S1 (belonging to the first group of stator segments) has a first winding set 117 (only in Figure 1 ) and output conductors 119a, b, c, i.e. one output conductor for each phase A, B, C, which are connected to a respective output conductor 119a, b, c of each other stator segment S1 belonging to the stator segment group.

[0055] As from Figure 1As can be further understood, each stator segment (e.g., S1 or S2) of any considered group of stator segments (e.g., the first or second group) has at least one segment that is different from the other group of the considered stator segment group, said segments being arranged directly circumferentially adjacent. For example, stator segment S1 has stator segment S2 arranged directly circumferentially adjacent on both circumferential sides, i.e., on both sides, said stator segment belongs to the second stator segment group.

[0056] Therefore, in Figure 1 In the embodiment illustrated in , each stator segment of any considered set of stator segments (eg S1 or S2) has two stator segments (eg S2) different from the considered set of stator segments (eg the first set), which are arranged directly circumferentially adjacent.

[0057] The electric machine 100 further comprises a first converter 111 and a second converter 112. The first converter 111 is connected to a conductor or bus bar 113 belonging to a first group of stator segments comprised in Figure 1 The second converter 112 is connected to a conductor or bus bar 114 which is connected to all winding sets of a second stator winding set comprising stator segment S2.

[0058] Similarly, like the stator segment S1 of the first stator segment group, the winding sets of the stator segment S2 of the second stator segment group are also connected in parallel (not illustrated) and then connected to the second converter 112 using conductors 114. The parallel-connected winding sets of the first stator segment of the first stator segment group are connected to the first converter 111 using conductors 113.

[0059] exist Figure 1 In the embodiment described in , the number of stator segment groups is two, namely, a first stator segment group and a second stator segment group. Figure 1 In the embodiment illustrated in , each stator segment of any considered set of stator segments (eg S1 ) has two stator segments (eg S2 ) different from the considered set of stator segments, which are arranged directly circumferentially adjacent.

[0060] Figure 1 This explains an electric machine having 12 stator segments.

[0061] Figure 2 A wind turbine 220 according to an embodiment of the present invention is schematically illustrated. The wind turbine comprises a wind turbine tower 221, on top of which a nacelle 222 is mounted. The nacelle comprises an electric motor 200 according to an embodiment of the present invention, which may be configured, for example, as Figure 1 、 4, 5, 6, 7. The wind turbine 220 further comprises a hub 223 at which a plurality of rotor blades 224 are mounted, wherein the hub 223 is mechanically connected to the rotor of the motor 200.

[0062] Figure 3 A conventional electric machine 300 is schematically illustrated, comprising a quadrant layout, wherein three stator segments S1 are arranged directly adjacent to each other circumferentially, and three stator segments S2 are also arranged directly adjacent to each other circumferentially. This results in elliptical deformation of the rotor 205, which can be reduced or even avoided according to embodiments of the present invention.

[0063] If a short circuit occurs, for example, Figure 1 In the first stator segment group (including stator segment S1) of the motor 100 illustrated in FIG, the attraction between the rotor and the stator is reduced at 6 points above the fault segment. Therefore, the rotor deformation is smaller, i.e., compared to FIG. Figure 3 The quadrant layout design illustrated in the conventional motor has smaller elliptical deformation.

[0064] Figure 4 The motor 400 according to another embodiment of the present invention is illustrated, and includes 16 stator segments S1, S2, S3, and S4, namely, four stator segments S1, four stator segments S2, four stator segments S3, and four stator segments S4. The stator segments S1 are grouped into a first group of stator segments, the stator segments S2 are grouped into a second group of stator segments, the stator segments S3 are grouped into a third group of stator segments, and the stator segments S4 are grouped into a fourth group of stator segments. Figure 4 In the embodiment illustrated in , the number of stator segment groups is four.

[0065] Each stator segment of any considered stator segment group (e.g. S1) has two stator segments that are different from the considered stator segment group, in particular belong to two different stator segment groups, and are arranged directly circumferentially adjacent to each other. For example, the stator segment S1 has a stator segment S2 arranged directly circumferentially on one side and a stator segment S4 arranged directly circumferentially on the other circumferential side.

[0066] Figure 4 The embodiments illustrated in can be viewed as a sequential system layout that can ensure balanced and distributed radial forces during single-phase or multi-phase short circuit events without causing elliptical deformation.

[0067] The winding sets of each stator segment belonging to one stator segment group are connected in parallel to one another and to the corresponding converters via busbars or conductors (not illustrated). Figure 4, four converters 411, 412, 425, and 426 are illustrated, wherein the first converter 411 is electrically connected to the winding sets of the first group via a conductor set 413, and the second converter 412 is connected to the winding sets of the second group of stator segments via a conductor set 415. The third converter 425 is connected to the winding sets of the third group of stator segments using a conductor set 427, and the fourth converter 426 is connected to the winding sets of the fourth group of stator segments using a conductor set 428.

[0068] In a first configuration of the electrical machine, the stator segments are arranged directly adjacent to one another on the circumference in the following order:

[0069] S1, S2, S3, S4, S1, S2, S3, S4, S1, S2, S3, S4, S1, S2, S3, S4.

[0070] In the second configuration, the stator segments are arranged circumferentially directly adjacent to each other in the following order:

[0071] S1, S2, S1, S2, S3, S4, S3, S4, S1, S2, S1, S2, S3, S4, S3, S4.

[0072] Thus, in the latter embodiment, the number of stator segment groups is also four, and each stator segment of any considered stator segment group has: one stator segment arranged directly circumferentially adjacent, which stator segment belongs to a stator segment group different from the group considered; and one stator segment arranged directly circumferentially adjacent, which stator segment belongs to the group considered.

[0073] exist Figure 4 In the second embodiment illustrated in , circumferentially adjacent segments of a specific stator segment may be two stator segments, which belong to the same group of stator segments or to two different groups of stator segments.

[0074] Figure 5 The motor 500 according to an embodiment of the present invention is schematically illustrated. Figure 4 The same stator segment layout as the first variant explained in Figure 4 In the embodiment 500 , further busbars 530 , 531 , 532 , 533 are illustrated, which provide for the parallel connection of the winding sets of the stator segments belonging to the same group.

[0075] Schematically illustrated multiple busbars 530, 531, 532, 533 are arranged in the radially inner part of the stator 510, ie radially away from the non-illustrated teeth and slots towards the axial center of the stator. In actual application, these busbars 530, ..., 533 can be arranged adjacent to the end windings.

[0076] Furthermore, the motor 500 includes two terminal boxes 535, 536, to which some of the busbars 530, ..., 533 are connected. Figure 5 As schematically illustrated in FIG, a total of four converters 511 , 512 , 525 , 526 can be electrically connected to the terminal boxes 535 , 536 .

[0077] The converter can provide at least one converter, in particular exactly one converter, for each stator segment group. The winding sets of different stator segment groups are disconnected from one another. The coils of the winding set of each stator segment can be arranged in slots 116 according to a centralized or distributed winding topology.

[0078] Figure 6 An electric machine 600 according to yet another embodiment of the present invention is schematically illustrated. The stator segments are arranged circumferentially adjacent to each other in the circumferential direction in the following order:

[0079] S1, S1, S2, S2, S3, S3, S4, S4, S1, S1, S2, S2, S3, S3, S4, S4.

[0080] The stator segment layout or design has advantages in terms of reduced cabling / busbar requirements and reduced rotor losses during converter operation. However, there may be a risk of elliptical deformation of the rotor during a single or multiple system short circuit event.

[0081] Figure 7 The motor 700 according to an embodiment of the present invention is described. Figure 6 The same stator segment layout as in the embodiment described in is also described. In addition, the layout of busbars 730, 731, 732, 733 is also described. Figure 7 The embodiment illustrated in includes junction boxes 735, 736 to which some of the busbars are connected.

[0082] exist Figure 5 and Figure 7 In , each single line represents a three-conductor busbar (one for each phase). The junction boxes 535, 735, 536, 736 are in different locations, and more or less than two junction boxes may be provided. Figure 5 and Figure 7 In the example illustrated in , 2×3 phase cable bundles are led out from each junction box and subsequently connected to separate converters.

[0083] exist Figure 7 In the embodiment illustrated in FIG, the busbar length is compared to Figure 5 The situation described in can be reduced by 25%.

[0084] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. In addition, elements described in connection with different embodiments may be combined. It should also be noted that the reference signs in the claims should not be construed as limiting the scope of the claims.

Claims

1. A stator (110) of a motor (100), the motor being particularly a permanent magnet synchronous motor, the stator comprising: a plurality of stator segments (S1, S2), said stator segments being arranged circumferentially adjacent to each other to form an annular structure covering the entire circumference; Each stator segment (S1, S2) has a plurality of teeth (115), wherein a plurality of slots (116) are located between the teeth, and a multiphase winding set (117) at least partially arranged in the slots, in particular exactly one multiphase winding set; wherein the stator segments are grouped into at least two stator segment groups; wherein the winding sets of each group of stator segment groups are connected in parallel with each other; wherein each stator segment (S1, S2) of any considered group of stator segments has at least one stator segment of another stator segment group of the considered group of stator segments, said stator segments being arranged directly circumferentially adjacent; Wherein, any one of the following optional features (A), (B), and (C) is true: (A) each stator segment (S1, S2, S3, S4) of any considered group of stator segments has two stator segments arranged directly circumferentially adjacent to each other, said stator segments belonging to one or more stator segment groups different from the group of stator segments considered; Among them, the number of stator segment groups is four; wherein each stator segment (S1, S2, S3, S4) of any considered stator segment group has two stator segments arranged directly circumferentially adjacent to each other, said two stator segments belonging to one or more stator segment groups different from the considered stator segment group, in particular to two different stator segment groups; (B) the number of the stator segment groups is four; Therein, each stator segment (S1, S2, S3, S4) of any considered set of stator segments has: a stator segment arranged directly circumferentially adjacent, which stator segment belongs to a stator segment group different from the stator segment group in question, and a stator segment arranged directly circumferentially adjacent, said stator segment belonging to the group under consideration; (C) the number of the stator segment groups is six or more, The number of segments is a multiple of the number of stator segment groups, in particular 12, 16, 20, 24 or more.

2. The stator according to the preceding claim, further comprising: a plurality of busbars (118, 530, 531, 532, 533), in particular multi-phase busbars, providing at least one busbar for each stator segment group; The busbars are used to connect the winding sets of each group of stator segment groups in parallel with each other.

3. The stator according to any one of the preceding claims, further comprising: Two or more terminal boxes (535, 536), wherein some of the winding sets and / or busbars are connected to each terminal box.

4. The stator according to any one of the preceding claims, further comprising: a plurality of converters (111, 112), whereby at least one converter is provided for each stator segment group, wherein the winding set (117) of each stator segment group (S1, S2) is connected to the associated converter (111, 112); In particular, the number of stator segment groups is equal to the number of converters.

5. A stator according to any one of the preceding claims, wherein: The winding sets of different stator segment groups are disconnected from each other.

6. A stator according to any one of the preceding claims, in, The coils of one winding set per stator segment are arranged in slots according to a concentrated or distributed winding topology, and / or wherein, for at least one phase, the coils of the winding sets of each stator segment are connected to each other in parallel and / or in series, and / or The conductors of different phases of each winding set are connected at a common connection point.

7. A motor (100), in particular a permanent magnet synchronous motor, comprising: A stator (110) according to any one of the preceding claims; a rotor (105), in particular an external rotor, which is rotatably mounted relative to the stator; In particular, for each stator segment group, a converter (111, 112) may be connected or connected to the winding set of the respective stator segment group.

8. The electric machine according to the preceding claim, which is configured to operate in the event of a failure of at least one stator segment group, in particular a short circuit.

9. A wind turbine (220) comprising an electrical machine (200) according to the preceding claim as a generator.

Images