Stator of electric machine, electric machine of vehicle, and electric drive of vehicle

Abstract

A stator including a stator core having first and second face sides forming slots and a stator winding formed of segmented conductors including first and second types of segmented conductors, each having a head disposed on the first face side and connecting the first and second legs; the legs of the first type are arranged in different layers and the heads axially extend to a first axial position, and the legs of the second type are arranged in the Lth layer and the heads axially extend to a larger second axial position; the head of the second type includes first and second combined bends, a diverting bend, first and second radial bends, the head extending circumferentially in a first orientation across the first combined bend and axially away from the first face side and circumferentially in a second orientation across the diverting bend and axially toward the first face side; the first head section extends radially to a first radial position, the second head section extends at a second axial position, and the third head section extends at a second radial position that is more outward than the radial direction; circumferentially adjacent pairs of segmented conductors of a second type of different phase windings are arranged such that the second head section of one extends partially along the other third head section.

Description

Technical Field

[0001] This invention relates to a stator for an electric motor. Furthermore, this invention relates to an electric motor for a vehicle and an electric drive for a vehicle. Background Technology

[0002] In automotive applications, a stator with stator windings made of segmented conductors is a highly preferred design in motors. The stator windings can include multiple phase windings, each phase winding comprising multiple partial windings. The partial windings can be connected in parallel and / or in series to form a phase winding.

[0003] For example, DE 10 2022 133 495 A1 discloses a stator for an electric motor. The stator includes a stator core and stator windings. The stator core has a longitudinal axis, an axial first facet, and an axial second facet opposite to the first facet. The stator windings form a plurality of slots extending from the first facet to the second facet. The stator windings have eight poles and include three phase windings. Each phase winding is formed by segmented conductors, each segmented conductor including legs disposed within a slot and connections electrically connecting two legs on a surface side. For each phase winding, the slots form eight winding regions, subdivided into layers one through eight, numbered sequentially in the radial direction. In each slot, one layer forms a receiving position for one of the legs. Each winding region extends two slots. For each phase winding, the stator windings include two current paths formed by the plurality of legs and the plurality of connections connecting the legs. Each phase winding includes segmented conductors with two legs positioned in the innermost radial layer.

[0004] When the two legs of a segmented conductor are located in the Lth layer of an L-layer system, the space available for two such segmented conductors to be closely adjacent is severely limited. In particular, the proper design of the segmented conductor is challenging when there are installation space constraints in the radial direction. Summary of the Invention

[0005] One object of the present invention is to provide an improved design for a segmented conductor having legs arranged in the Lth layer of L layers, which takes into account the limitations of radial mounting space.

[0006] The aforementioned objective is achieved by a stator for an electric motor, the stator comprising a stator core and stator windings, the stator core having a longitudinal axis, an axial first facet, and an axial second facet opposite to the first facet, and the stator windings forming a plurality of slots extending from the first facet to the second facet, the stator windings comprising N phase windings, where N≥2; wherein the stator windings are formed by segmented conductors, the segmented conductors forming legs and connecting portions, each leg being arranged in one of the slots, and each connecting portion electrically connecting two legs of the legs at one of the facets; the slots are subdivided into a first layer to an Lth layer, the first layer to the Lth layer being numbered according to their radial order from the outside to the inside, where L≥4 and is an even number; the segmented conductors comprising a first type of segmented conductor and a second type of segmented conductor. The first type of segmented conductor has a head on a first surface side, and a first leg of the legs is connected at a first connection point to a second leg of the legs at a second connection point, such that the legs are spaced apart by a certain number of slot pitches in the circumferential direction. The legs of the first type of segmented conductor are disposed in different layers, and the head of the first type of segmented conductor extends axially to a first axial position, which is at a predetermined distance from the first surface side. The legs of the second type of segmented conductor are disposed in the Lth layer, and the head of the second type of segmented conductor extends axially to a second axial position, which is at a second predetermined distance from the first surface side, which is greater than the first predetermined distance. Each phase winding includes at least one second type of segmented conductor. The head of each second type of segmented conductor includes...

[0007] (i) In the first combined bend between the first connection point and the second connection point, the head portion extends obliquely beyond the first combined bend, enters the first orientation in the circumferential direction and enters the axial direction away from the first surface side.

[0008] (ii) A steering bend, located between the first combined bend and the second connection point, wherein the head portion extends circumferentially beyond the steering bend along a second orientation opposite to the first orientation in the circumferential direction.

[0009] (iii) A first radial bend, the first radial bend being radially outwardly oriented between the turning bend and the second connection point.

[0010] (iv) A second radially curved portion, the second radially curved portion being radially inwardly oriented between the first radially curved portion and the second connection point,

[0011] (v) A second combined bend, located between the second radial bend and the second connecting portion, wherein the head extends obliquely beyond the second combined bend, enters the second orientation in the circumferential direction, and extends toward the first surface into the axial direction; wherein,

[0012] Between the first combined bend and the first radial bend, the head forms a first head segment that extends radially to a first radial position; wherein, between the turning bend and the second combined bend, the head portion forms a second head segment that extends at a second axial position; wherein, outside the second radial bend, the head portion forms a third head segment that extends radially outward at a second radial position; wherein circumferentially adjacent pairs of second-type segmented conductors of different phase windings are arranged such that the second head segment of one of the pairs of second-type segmented conductors partially extends along the third head segment of the other of the pairs of second-type segmented conductors.

[0013] The stator according to the invention includes a stator core and a stator winding. The stator core has a longitudinal axis, an axial first face side, and an axial second face side. The second face side is opposite to the first face side. The stator core forms a plurality of slots extending from the first face side to the second face side. The stator winding is formed of segmented conductors. The stator winding includes N phase windings, where N≥2.

[0014] The stator winding is formed by segmented conductors. The segmented conductors form legs and connecting sections. Each leg is arranged in a slot. Each connecting section electrically connects two legs at one point on one side of the winding.

[0015] The slots are subdivided into layers numbered from the first to the Lth. These layers are numbered according to their radial order from the outside to the inside, where L ≥ 4 and is an even number.

[0016] The segmented conductors include first-type and second-type segmented conductors, each having a head. The head portion is located on a first face side. The head connects a first leg of the legs at a first connection point and a second leg of the legs at a second connection point, such that the legs are spaced apart by a certain number of slot pitches in the circumferential direction. The legs of the first-type segmented conductors are located in different layers. The head of the first-type segmented conductor extends axially to a first axial position. The first axial position is at a predetermined distance from the first face side. The legs of the second-type segmented conductors are located in a Lth layer. The head of the second-type segmented conductor extends axially to a second axial position. The second axial position has a second predetermined distance from the first face side. The second predetermined distance is greater than the first predetermined distance. Each phase winding includes at least one second-type segmented conductor.

[0017] Each type II segmented conductor's head includes a first combined bend, a turning bend, a first radial bend, a second radial bend, and a second combined bend. The first combined bend is located between a first connection point and a second connection point. Beyond the first combined bend, the head extends obliquely into a first orientation in the circumferential direction and into an axial direction away from the first face. The turning bend is located between the first combined bend and the second connection point. Beyond the turning bend, the head extends circumferentially along a second orientation in the circumferential direction. The second orientation is opposite to the first orientation. The first radial bend is located between the turning bend and the second connection point. The first radial bend is radially outward-oriented. The second radial bend is located between the first radial bend and the second connection point. The second radial bend is radially inward-oriented. The second combined bend is located between the second radial bend and the second connection. Beyond the second radial bend, the head extends obliquely into the second orientation in the circumferential direction and into the axial direction towards the first face.

[0018] Between the first combined bend and the first radial bend, a first head segment is formed. The first head segment extends radially to a first radial position. Between the turning bend and the second combined bend, a second head segment is formed. The second head segment extends at a second axial position. Outside the second radial bend, a third head segment is formed. The third head segment extends at a second radial position. The second radial position is radially further outward than the first radial position. Circumferentially adjacent pairs of second-type segmented conductors of different phase windings are arranged such that the second head segment of one of the second-type segmented conductors in the pair extends partially along the third head segment of the other second-type segmented conductor in the pair.

[0019] The present invention is based on the consideration of raising the second type of segmented conductor to a second axial position above the axial position of the first type of segmented conductor. Since the two second type of segmented conductors in the pair must pass over each other above the first type of segmented conductor, the second type of segmented conductor is provided with a first radial bend, which allows the second head section of one of the segmented conductors in the pair to extend partially along the third head section of the other segmented conductor in the pair in an overlapping manner.

[0020] Advantageously, no additional radial mounting space is required to house the pair of second-class segmented conductors in the stator. This is particularly useful when radial mounting space is limited to ensure sufficient distance from the rotor disposed inside the stator core. This results in a very small encapsulation space. Similarly, connections between legs in the same layer, i.e., the Lth layer, can be achieved using a single type of segmented conductor adapted to pass appropriately through the other corresponding segmented conductors.

[0021] In relation to this invention, the terms “axial,” “axial direction,” “radial,” “radial direction,” “circumferential,” and “circumferential direction” refer to the longitudinal axis of the subcore.

[0022] The stator core can be formed from multiple axially stacked and / or electrically isolated laminations made of metal. Typically, slots extend axially through the stator core. In particular, the slots are distributed circumferentially on the stator core.

[0023] Regarding the layers, preferably, the first layer is the radially outermost layer, and in particular the radially outermost layer. Therefore, the L layer can be the radially innermost layer, and in particular the radially innermost layer. Furthermore, for all 1≤i≤L / 2, the (2•i)th layer and the (2•i-1)th layer can form the i-th double layer.

[0024] According to a preferred design of the stator of the invention, outside the second combined bend, the head of the other second-class segmented conductor in the pair of second-class segmented conductors extends partially between the first head of one of the second-class segmented conductors and the first axial face side. That is, after passing through the other segmented conductor in the second-class segmented conductors, one of the second-class segmented conductors extends rearward toward the first face side below the other segmented conductor.

[0025] Preferably, the head of each second type of segmented conductor further includes: (vi) a third radially inwardly pointing portion between the second combined bend and the second connection point; wherein the third head is formed between the second radially bend and the third radially bend. The third radially bend ensures that the head is guided back to the radial position.

[0026] The head of each type 2 segmented conductor may further include: (vii) a fourth radial bend that points radially outward between the third radial bend and the second connection point; wherein, between the fourth radial bend and the second connection point, the head forms a fourth head segment that extends at a third radial position that is radially inward from the second radial position.

[0027] According to a preferred embodiment of the stator of the present invention, the head of each second type segmented conductor further includes: (viii) a third combined bend, the head extending beyond the third combined bend at a circumferential position of the second connection point and extending axially toward the second connection point. The third combined bend allows the head to be guided into a slot in which the second leg of the second type segmented conductor is disposed.

[0028] Preferably, each phase winding includes a first to an Ath portion winding, each portion winding forming a current path of multiple legs connected in series from the starting leg of the multiple legs to the ending leg of the multiple legs, where A≥2, and each portion winding provides a second type of segmented conductor.

[0029] The stator may include a connection device configured to connect portions of each phase winding in parallel and / or in series and / or provide phase terminals for each phase winding and / or realize star or delta connection of the phase windings.

[0030] Furthermore, the stator winding of the stator according to the invention may have 2•P poles, wherein for each pole and phase winding, a slot forms a winding region that extends over all L layers and over q slots in each layer to include L•q consecutive receiving positions for receiving legs of the same phase winding.

[0031] Specifically, exactly L legs are positioned in each slot and / or each receiving space accommodates exactly one leg. The stator can be configured such that when N-phase alternating current is supplied to the phase windings, the current flowing through the legs positioned in the same winding region has the same direction. Each winding region can extend over L layers and q slots. This allows for the formation of straight stator windings. However, each winding region can also extend over L layers and more than q slots. In this case, skewed stator windings can be achieved.

[0032] Preferably, the legs of the second type of segmented conductor are circumferentially separated by N•q slot pitches.

[0033] The legs of a first-class segmented conductor can be circumferentially spaced at a pitch of N•q-1 and / or at a pitch of (N+1)•q-1. Specifically, a first-class segmented conductor with legs formed in different layers of the same double layer can achieve a pitch of N•q-1. A first-class segmented conductor with legs formed in different double layers can achieve a pitch of (N+1)•q-1.

[0034] According to the preferred design, A ≥ q + 1 and A ≠ x•q, where x is an integer; wherein for each phase winding, one winding region in the winding area is the starting winding region, and one winding region in the winding area is the ending winding region, and exactly one winding region of each of the other phase windings is circumferentially arranged between the starting winding region and the ending winding region, wherein the starting leg of the portion winding of the corresponding phase winding in the phase winding is located in the starting winding region, and the ending leg of the portion winding of the corresponding phase winding in the phase winding is located in the ending winding region. This design solves a stator winding in which each phase winding includes a number of portion windings of A, which is greater than the number of slots q in each layer of the winding area and is a non-multiple of q. Here, the number q can also be understood as the number of slots per pole and per phase of the stator winding. Because the starting and ending legs of all partial windings of the corresponding phase winding are located in circumferentially adjacent starting and ending winding regions, and are therefore relatively close, the connection of partial windings for the same phase winding does not need to be extended over more than two winding regions. Advantageously, when the stator allows for high-performance and high-power operation due to the relatively large number of partial windings, the stator according to this design allows for the connection of partial windings in a space-efficient manner.

[0035] Preferably, the starting legs of the q partial windings corresponding to a phase winding are arranged in the y-th double layer, where 1 ≤ y ≤ L / 2. That is, the y-th double layer accommodates as many starting legs as possible in a manner that arranges the starting legs very close to each other. In a particularly convenient design, y equals 1. That is, the q partial windings are arranged in the first double layer, which allows for radial peripheral connection of the windings from the winding heads formed on the face side.

[0036] The connection of partial winding q can be further simplified when the starting leg of partial winding q is arranged in the same layer of the y-th double layer. In particular, the same layer is the first layer.

[0037] Similarly, the end legs of part of the winding q can be arranged in the y-th double layer.

[0038] Furthermore, one or more starting legs of the partial winding (Aq) can be arranged in the (y+1) or (y-1)th double layer. That is, the partial winding (Aq) is arranged in a radially adjacent double layer relative to the partial winding q. Similar to the aforementioned advantages, one or more ending legs of the partial winding (Aq) can be arranged in the first double layer.

[0039] The following describes a preferred winding scheme that allows for the manufacture of symmetrical stator windings for the stator.

[0040] According to the preferred winding scheme, in each partial winding, the legs are arranged in the first to (2•P•q•L / A) receiving positions in the receiving positions of the leg pattern defining the partial winding, the numbering of the receiving spaces corresponds to the sequence of the legs along the current path, and the starting leg is arranged in the first receiving space.

[0041] Preferably, the leg pattern for the (j+1)th partial winding corresponds to the leg pattern for the first partial winding offset by 2•N•q•j slots in a predefined orientation in the circumferential direction for all 1≤j≤A-1, and the first receiving space of the (j+1)th partial winding is the (1+2•j)th receiving space of the first partial winding. In other words, the leg pattern of each partial winding can be aligned with other leg patterns by circumferential offset. This allows for the formation of a consistent “loop” for each partial winding of the same phase winding, which opens between the starting and ending winding regions.

[0042] Regarding a preferred stator winding scheme according to the invention, it is further possible that the current path of the first portion of the winding comprises a first to a Lth sub-path numbered sequentially along the current path, the first sub-path comprising a starting leg, wherein each sub-path comprises the first to (3•P / 2)th sub-paths among the legs arranged in alternating layers of the same double layer. That is, in each double layer, each portion of the winding occupies only a portion of the winding region of the phase winding. Furthermore, each sub-path can be considered as a waveform winding within one of the double layers.

[0043] More preferably, for all 1≤k≤L / 2, the leg of the kth sub-path is arranged in the kth double layer, and the leg of the Lth sub-path is arranged in the (L+1-l)th double layer.

[0044] More preferably, the first sub-path to the (L / 2)th sub-path extends around the longitudinal axis in a first orientation in the circumferential direction, and the [(L / 2)+1]th sub-path to the Lth sub-path extends around the longitudinal axis in a second orientation in the circumferential direction, the second orientation being opposite to the first orientation. For example, when viewed from the first face side, the first orientation is clockwise or counterclockwise.

[0045] Alternatively or additionally, the first leg of the first sub-path and the (3•P / 2)th leg of the Lth sub-path are arranged in the same layer.

[0046] Alternatively or additionally, the (3•P / 2) leg of the (L / 2) subpath and the first leg of the [(L / 2)+1)] subpath are arranged in the same layer.

[0047] Furthermore, each winding region can be subdivided into first to q-th sub-regions, wherein the m-th sub-region includes the m-th receiving position among the first to q-th receiving positions of each layer, the first to m-th receiving positions being numbered according to their order in the circumferential direction, in particular according to the second orientation of the circumferential direction, wherein, for all cases, 1≤n≤q.

[0048] Preferably, for all 2≤o≤N, the o-th phase winding corresponds to the first phase winding offset by (o-1)•q slots.

[0049] According to a preferred embodiment, the starting leg and ending leg of each partial winding are implemented using I-type segmented conductors. Each I-type segmented conductor includes a leg, a connecting section extending from the leg to the stator core on a second side, and an ending portion extending from the leg to the stator core on a first side. Both the first and second types of segmented conductors are implemented using U-type segmented conductors. For each leg, the U-type segmented conductor may include a connecting section extending from the leg to the stator core on the second side and connecting to a connecting section of another segmented conductor to form a connection between the leg and one of the legs of the other segmented conductor.

[0050] The above objective is further achieved by an electric motor for a vehicle, which includes a stator as described above and a rotor rotatably mounted relative to the stator.

[0051] The motor can be a synchronous motor. The rotor can be permanently excited or electrically excited. Alternatively, the motor can be an induction motor.

[0052] The rotor may include a rotor core having two axial sides and a rotor winding extending from the rotor core, wherein the radially outer periphery of the rotor winding and the radially inner periphery of the stator face each other and form an annular space therebetween with a predetermined radial range.

[0053] The aforementioned objective is further achieved by an electric drive for a vehicle, comprising a motor, a gearbox, and an inverter as described above, the inverter being configured to supply N-phase alternating current to the stator windings. Preferably, the motor, gearbox, and inverter are housed in an integrated housing.

[0054] Electric vehicles can be battery-electric vehicles. Alternatively, electric vehicles may include an additional internal combustion engine and be hybrid vehicles.

[0055] All statements relating to the stator according to the invention are similarly applicable to motors and electric drives, so that the aforementioned advantages of the inverter of the invention can also be achieved through them. Attached Figure Description

[0056] Further details and advantages of the invention are disclosed below, with reference to the accompanying drawings. The drawings schematically illustrate:

[0057] Figure 1 Schematic diagram of an embodiment of the stator according to the present invention;

[0058] Figure 2 Block diagram of the stator winding according to an embodiment;

[0059] Figure 3 A winding scheme for one of the phase windings according to this embodiment;

[0060] Figure 4 The detailed winding scheme of the first sub-path to the third sub-path of the first part of the phase winding shown;

[0061] Figure 5 The detailed winding scheme of the fourth to sixth sub-paths of the first part of the phase winding shown;

[0062] Figure 6 A schematic diagram of the segmented conductor in the implementation method;

[0063] Figure 7 Detailed view of the stator in the embodiment;

[0064] Figure 8 Top view of a segmented conductor of the second type;

[0065] Figure 9 Side view of a segmented conductor of type II;

[0066] Figure 10 Top views of two segmented conductors of type II; and

[0067] Figure 11 A schematic diagram of a vehicle having an embodiment of an electric drive according to the present invention. Detailed Implementation

[0068] Figure 1 This is a schematic diagram of an embodiment of stator 1.

[0069] The stator 1 includes a stator core 2, which has a longitudinal axis 3, an axial first surface side 4, and an axial second surface side 5 opposite to the first surface side 4. The stator core 2 forms a plurality of slots 6. For illustrative purposes, in... Figure 1 Only three of them are shown in the diagram. The groove 6 extends from the first side 4 to the second side 5. In particular detail, the stator core 2 is formed of a plurality of axially stacked and isolated metal laminations (not shown).

[0070] Furthermore, the stator 1 includes a stator winding 7, which includes N phase windings U, V, and W. In this embodiment, N=3 phase windings U, V, and W are provided. The stator winding 7 is formed by segmented conductors 8a-d, wherein... Figure 1The segmented conductors 8a and 8b are only schematically depicted. Segmented conductors 8a-d form legs 9, each leg 9 being arranged in one of the slots 6. Furthermore, the segmented conductors form connecting portions 10a and 10b, each connecting portion 10a and 10b electrically connecting two legs 9 at one of their facing sides 4 and 5. Connecting portions 10a and 10b form winding heads 12 and 13 at corresponding facing sides 4 and 5 of the stator core.

[0071] In detail, segmented conductors 8a, c, and d are provided as U-shaped segmented conductors, and segmented conductor 8b is provided as an I-shaped segmented conductor. Each of the U-shaped segmented conductors 8a, 8c, and 8d includes two legs 9 and a head section 14, with the head section 14 forming one of the connecting portions 10a. The legs 9 of the U-shaped segmented conductors 8a, 8c, and 8d are integrally formed with either the connecting portion 10a or the head section 11a connecting the two legs 9 at the first face side 4. The I-shaped segmented conductor 8b includes one leg 9 and an end section 11b at the first face side 4. At the second face side 5, segmented conductors 8a-c include connecting sections 11c extending from the corresponding legs 9. The connecting portion 10b is formed by mechanically and electrically connecting the connecting sections 11c of a pair of segmented conductors 8a-c. Figure 1 In the figure, only one U-shaped segment conductor 8a is fully shown, which is connected to another U-shaped segment conductor 8a that is partially depicted.

[0072] Figure 2 This is a block diagram of the stator winding 7 according to an embodiment.

[0073] Each phase winding U, V, W includes a first to an Ath portion winding. In this embodiment, A=4 portion windings 14a, 14b, 14c, 14d are provided. Each portion winding 14a-d forms a current path for a plurality of legs 9 connected in series from the starting leg 15 and the ending leg 16 of the leg 9.

[0074] Specifically, each current path includes a first to an Lth sub-path. In this embodiment, L=6 sub-paths 16a, 16b, 16c, 16d, 16e, and 16f are provided. Sub-paths 16a-f are numbered according to their order along the current path, wherein the first sub-path 16a includes a starting leg 15, and the Lth (=sixth) sub-path 16f includes an ending leg 16. For simplicity, only the sub-paths 16a-f of the first portion of the winding 14a of the phase winding U are given reference numerals.

[0075] With the help of Figure 1The terminating device 17, schematically shown, has portions 16a-f of each phase winding U, V, and W connected in parallel. The terminating device 17 further forms a neutral point 19 for phase connections 18u, 18v, and 18w for each phase winding U, V, and W and for Y-connections of the phase windings U, V, and W.

[0076] Figure 3 This is a winding scheme for one phase winding in phase winding U according to an embodiment. Wherein, Figure 3 The upper table shows the receiving positions of legs 9 of phase windings U, V, and W with different shading. The four tables below show the respective winding schemes of each section winding 14a-d of phase winding U. In the tables, each cell represents a receiving position. In addition, each column of one of the tables corresponds to a slot 6. The slot numbers are depicted between the upper and lower tables.

[0077] exist Figure 3 In the diagram, the connecting portion 10a at the first side 4 is indicated by the dashed arrow between the receiving positions, where the receiving positions accommodate the leg 9 connected by the connecting portion 10a. The connecting portion 10b at the second side 5 is indicated by the solid line between the receiving positions, where the leg 9 connected by the connecting portion 10b is accommodated in the receiving position.

[0078] The slot 6 is subdivided into layers 1 through L. In this embodiment, L=6 layers 20a, 20b, 20c, 20d, 20e, 20f are provided, where each row of the table corresponds to one of layers 20a-f. Layers 20a-f are numbered according to their radial order. In this embodiment, layer 1 20a is the outermost radial layer, and layer L (=6th) 20f is the innermost layer. In each slot 6, one of layers 20a-f forms a receiving position for one of the legs 9.

[0079] Furthermore, for all 1≤i≤L / 2, the (2•i)th and (2•i-1)th layers 20a-f form the i-th double layer 21a-c. That is, the first layer 20a and the second layer 20b form the first double layer 21a, the third layer 20c and the fourth layer d form the second double layer 21b, and the fifth layer 20e and the sixth layer 20f form the third double layer 21c.

[0080] According to this embodiment, the stator winding includes 2p=8 poles, and the number of slots per pole per phase is q=3. That is, the number of partial windings A=4 is greater than or equal to q+1=4 (A≥q+1), but not a multiple of q (A≠x•q, where x is an integer). For each pole and phase winding, the slots form a winding region 22, which extends over all L=6 layers 20a-f, and in each layer 20a-f, extends over q=3 slots to contain L•q=18 consecutive receiving positions for legs 9 that accommodate the same phase windings U, V, W. For simplicity, in Figure 3 Some winding regions 22 are indicated only by the attached diagram.

[0081] For each phase winding U, V, W, one winding region in winding region 22 is the starting winding region 22a, and one winding region in winding region 22 is the ending winding region 22b. Among them, exactly one winding region 22 of each of the other phase windings U, V, W is arranged circumferentially between the starting winding region 22a and the ending winding region 22b.

[0082] The starting leg 15 of a corresponding portion of winding 14a in phase windings 14a-d is disposed in the starting winding region 22a, and the ending leg 16 of a corresponding portion of winding 14a-d in phase windings 14a-d is disposed in the ending winding region 22b. Figure 3 In the table above, the symbol "x" indicates the location of the starting leg 15 for the phase windings U, V, and W, and the symbol "o" indicates the ending leg 16. It can be seen that the starting legs 15 for the connecting windings 14a-d are arranged closely on only 8 of the 2•P•N=24 winding zones 22, which allows for very low space consumption for the connecting windings 14a-d.

[0083] The following describes the winding scheme for phase winding U. For the other phase windings W and V, the winding scheme is the same, but they are offset by q slots or 2•q slots respectively in the circumferential direction.

[0084] In particular, the starting legs 15f of partial windings 14a-c with q=3 are arranged in the first double layer 21a (y=1), especially in the first layer 20a. The remaining starting legs 15 of partial windings 14d with Aq=1 are arranged in the radially adjacent second double layer 21b (y+1=2), especially in the third layer 20c. That is, the starting legs 15 are concentrated in the radial periphery of the stator windings 7 to facilitate connection of partial windings 14a-d.

[0085] More specifically, the end legs 16 of the q=3 partial windings 14a-c and the end legs 16 of the Aq=1 partial winding 14d are also arranged in the first double layer 21a. That is, the end legs 16 are concentrated in the radial periphery of the stator winding 7 to facilitate connection of the partial windings 14a-d.

[0086] In each of the partial windings 14a-d, legs 9 are arranged in the first to the second•P•q•L / A=36 receiving positions, which define the leg pattern for the receiving positions of the partial windings 14a-d. In each of the four tables below, the shaded cell or receiving position shows the leg pattern of the corresponding partial 14a-d. The numbering of the first to the 36th receiving spaces corresponds to the order of the legs 9 along the current path, with the starting leg 15 arranged in the first receiving space. It can be seen that when comparing the leg patterns for the partial windings 14a-d, for all 1≤j≤A-1=3, the leg pattern for the (j+1)th partial winding corresponds to the leg pattern of the first partial winding, which is shifted by 2•N•q•j=18•j slots 6 in a predefined orientation in the circumferential direction (indicated by arrow 23b). Among them, the first accommodating space of the (j+1)th part of the winding 14b-d is the (1+2•j)th accommodating space of the first part of the winding 14a.

[0087] That is, in this embodiment,

[0088] –For j=1, the leg pattern of the second winding 14b (j+1=2) is shifted by 18 (=2•N•q•1) slots 6 along a predetermined orientation on the first winding 14a, such that the first receiving space of the second winding 14b (represented by 24a) is the third receiving space (1+2•1) of the leg pattern of the first winding 14a.

[0089] – For j=2, the leg pattern of the third winding 14c (j+1=3) is shifted 36 (=2•N•q•2) slots 6 above the first winding 14a in a predetermined orientation, such that the first receiving space of the third winding 14c (represented by 24b) is the fifth receiving space (1+2•2) of the leg pattern of the first winding 14a, and

[0090] –For j=3, the leg pattern of the fourth winding 14d (j+1=4) is shifted 54 (=2•N•q•2) slots 6 above the first winding 14a in a predetermined orientation, such that the first receiving space of the fourth winding 14d (represented by 24c) is the seventh receiving space (1+2•3) of the leg pattern of the first winding 14a.

[0091] The following describes further details of the winding scheme for the first part, winding 14a. Among them, Figure 4 and Figure 5 Each of these is a detailed winding scheme for the first part, winding 14a, in which... Figure 4 The first sub-path to the third sub-path 25a-c of the first section winding 14a is shown, and Figure 5The fourth to sixth subpaths 25d-f of the first section winding 14a are shown. For each subpath 25a-f, in... Figure 4 and Figure 5 The table provided contains, with Figure 3 Correspondingly, each column corresponds to a slot 6, each row corresponds to a layer 20a-f, and each cell corresponds to a receiving position.

[0092] The current path of the first section winding 14a includes first to sixth (= 1st) sub-paths 25a-f, numbered sequentially along the current path. The first sub-path 25a includes a starting leg 15, and the sixth (= Lth) sub-path 25f includes an ending leg 16. Each sub-path 25a-f includes the first to sixth [= (3•P / 2)] legs 9a-f arranged in alternating layers 20a-f of the same double layer 21a-c.

[0093] For all 1≤k≤L / 2, the legs 9a-f of the k-th sub-path 25a-c are arranged in the k-th double layer 21a-c, and for all 1≤k≤L / 2, the legs 9a-f of the L-th sub-path 25d-f are arranged in the (L+1-l) double layer L / 2+1≤l≤L. That is, in this embodiment,

[0094] –For k=1, the leg 9a-f of the first (=kth) subpath 25a is arranged in the first (=kth) double layer 21a.

[0095] –For k=2, the legs 9a-f of the second (=kth) subpath 25b are arranged in the second (=kth) double layer 21b.

[0096] –For k=3, the legs 9a-f of the third (=kth) subpath 25c are arranged in the third (=kth) double layer 21c.

[0097] –For l=4, the leg 9a-f of the fourth subpath 25d is arranged in the third [= (L+1-l)] double layer 21c,

[0098] – For l=5, the legs 9a-f of the fifth subpath 25e are arranged in the second [= (L+1-l)] double layer 21b, and

[0099] –For l=6, the leg 9a-f of the sixth subpath 25f is arranged in the third first [= the (L+1-l)] double layer 21a.

[0100] Furthermore, the first to third sub-paths 25a-c are circumferentially aligned around the longitudinal axis 3 in a first orientation (indicated by arrow 23a) in the circumferential direction (see [reference]). Figure 1The fourth sub-path 25d-f extends around the longitudinal axis 3 in a second orientation in the circumferential direction (indicated by arrow 23b). Specifically, when observing the first facet 4 of the stator core 2, the first orientation is the counterclockwise orientation as seen, and the second orientation is the clockwise orientation (see [reference]). Figure 1 Furthermore, in this embodiment, the second orientation corresponds to the predefined orientation described above.

[0101] Furthermore, the first leg 9a of the first sub-path 25a and the sixth leg 9f of the Lth sub-path are configured on the same layer. In this embodiment, the same layer is the first layer 20a. The sixth leg 9f of the third sub-path 25c is configured on the same layer as the first leg 9a of the fourth sub-path. In this embodiment, the same layer is the sixth (Lth) layer 20f.

[0102] In this embodiment, each winding region 22 is subdivided into first to third (=q) sub-regions 26a-c, wherein the m-th sub-region 26a-c includes the m-th receiving position among the first to third (=q) receiving positions of each layer 20a-f. The first to third receiving positions are numbered sequentially according to their second orientation in the circumferential direction (see arrow 23b). For all 1≤n≤q, the (2n-1)th and (2n)th legs 9a-f of the first to (L / 2)th sub-paths 25a-c are arranged in the n-th sub-region 26a-c, and the (2n-1)th and (2n)th legs of [(L / 2)+1] to the L-th sub-path 25d-f are arranged in the (q-n+1)-th sub-region 26a-c.

[0103] That is, in this embodiment,

[0104] –For n=1, the first leg 9a and the second leg 9b of the first to third sub-paths 25a-c are arranged in the first (=nth) partition 26a.

[0105] –For n=2, the third leg 9c and the fourth leg 9d of the first to third [= (L / 2)] subpaths 25a-c are arranged in the second (= nth) partition 26b.

[0106] –For n=3, the fifth leg 9e and the sixth leg 9f of the first to third subpaths 25a-c are arranged in the third (=n) partition 26b.

[0107] –For n=1, the first leg 9a and the second leg 9b of the fourth [=((L / 2)+1)] to the sixth (=L) subpath 25d-f are arranged in the third [=(q-n+1)] partition 26c.

[0108] – For n=2, the third leg 9c and the fourth leg 9d of the fourth [= ((L / 2)+1)] to the sixth (= L) subpath 25d-f are arranged in the second [= (q-n+1)] partition 26b, and

[0109] –For n=3, the fifth leg 9e and the sixth leg 9f of the fourth [= ((L / 2)+1)] to the sixth (= L) subpath 25d-f are arranged in the first [= (q-n+1)] partition 26a.

[0110] In the following text, the segmented conductors 8a-c of this embodiment are described (see Figure 1 Further details of its construction.

[0111] Figure 6 This is a schematic diagram of the segmented conductors 8a-d in this embodiment.

[0112] U-shaped segmented conductors 8a, c, and d include a first type of segmented conductor 8a and a second type of segmented conductor 8c. In each of the U-shaped segmented conductors 8a and 8c, the legs 9 are a first leg 9' and a second leg 9'", each leg being arranged in one slot of the slot 6. As described above, a head 11a is provided at the first face side 4. The head 11a connects the first leg 9' at a first connection point 50 to the second leg 9'" at a second connection point 51, such that the legs 9' and 9'" are spaced apart circumferentially by a certain number of slot 6 pitches.

[0113] In this embodiment, different layers 20a-f are formed within the same double layer 21a-c (see...). Figure 4 and Figure 5 The first type of segmented conductor 8a in the legs 9a-f achieves a pitch of N•q-1, i.e., the pitch of eight slots 6. The first type of segmented conductor 8a forming legs 9a and 9f respectively achieves a pitch of (N+1)•q-1, i.e., the pitch of eleven slots 6. The legs 9a and 9f are set in different double layers 21a-c or connected to the subsequent first to third [= (L / 2)] sub-paths 25a-c and the subsequent fourth [= ((L / 2)+1)] to sixth [= L] sub-paths 26d-f. The legs 9a and f are all set in the sixth (= L) layer 20f (see Figure 4 and Figure 5 The second type of segmented conductor 8c achieves a pitch of N•q slots 6, that is, a pitch of nine slots 6.

[0114] Needless to say, in Figures 3 to 4 The winding scheme shown contains another type of U-shaped segmented conductor, which will not be described in further detail here. This refers to the fact that the U-shaped segmented conductors forming legs 9a-f are all located in the first layer 20a and exist in the second to fourth parts of the phase winding U, windings 14a-d, and the corresponding parts of the phase windings V and W. These U-shaped segmented conductors achieve a pitch of N•q slots 6, that is, a pitch of nine slots 6.

[0115] Figure 7 This is a detailed view of the stator 1 according to this embodiment, viewed from the inner periphery at the first side 4.

[0116] The head 11a of the first type of segmented conductor 8a extends axially to a first axial position 52, and the first axial position 52 has a predetermined distance 53 from the first surface side 4. The head 11a of the second type of segmented conductor 8c extends axially to a second axial position 54, and the second axial position 54 has a second predetermined distance 55 from the first surface side 4, and the second predetermined distance 55 is greater than the first predetermined distance 53.

[0117] Figure 8 and Figure 9 Each of the segmented conductors of the second class 8c is shown in part, wherein Figure 8 It is a side view. Figure 9 It is a top view.

[0118] Each second-class segmented conductor 8c has a head 11a including a combined bend 56 between the first connection point 50 and the second connection point 51. Beyond the combined bend 56, the head 11a extends obliquely into a first orientation in the circumferential direction (see arrow 23a) and into an axial direction away from the first facet 4 (see...). Figure 7 ).

[0119] Furthermore, the head 11a includes a turning bend 57 between the first combined bend 56 and the second connection point 51. Beyond the turning bend 57, the head 11a extends circumferentially in a second orientation opposite to the first orientation (see arrow 23b).

[0120] Furthermore, the head 11a includes a first radial bend 58 between the steering bend 57 and the second connection point 51. The first radial bend is oriented radially outward.

[0121] Furthermore, the head 11a includes a second radial bend 59 between the first radial bend 58 and the second connection point 51. The second radial bend 60 is radially inwardly oriented.

[0122] Furthermore, the head 11a includes a second combined bend 60 between the second radial bend 59 and the second connection point 51. Beyond the second combined bend 60, the head 11a extends obliquely into a second orientation in the circumferential direction and into the axial direction toward the first surface side 4.

[0123] Furthermore, the head 11a includes a third radial bend 61 between the second combined bend 60 and the second connection point 51. The third radial bend 61 is oriented radially inward between the second combined bend 60 and the second connection point 51.

[0124] Furthermore, the head 11a includes a fourth radial bend 62 between the third radial bend 61 and the second connection point 51. The fourth radial bend 62 is oriented radially outward.

[0125] Furthermore, the head 11a includes a third combined bend 63, beyond which the head 11a extends axially toward the second connection point 51 at a circumferential position. The third combined bend 63 is disposed between the fourth radial bend 62 and the second connection point 51.

[0126] Between the first combined bend 56 and the first radial bend 58, a head 11a forms a first head segment 64, which extends radially to a first radial position. Between the turning bend 57 and the second combined bend 60, a head forms a second head segment 65 extending at a second axial position 54. Between the second radial bend 59 and the third radial bend 61, a head 11a forms a third head segment 66, which extends radially outward at a second radial position compared to the first radial position. Between the fourth radial bend 62 and the second connection point 51, a head 11a forms a fourth head segment 67, which extends radially inward at a third radial position compared to the second radial position.

[0127] Figure 10 It is a top view of two second-class segmented conductors 8c' and 8c”.

[0128] The circumferentially adjacent second-type segmented conductor pairs 8c' and 8c" of different phase windings U, V, and W are arranged such that the second head section 65 of one segmented conductor in the second-type segmented conductor pair 8c' extends partially along the third head section 66 of the other segmented conductor in the second-type segmented conductor pair 8c"

[0129] Furthermore, beyond its second combined bend 60, the head 11a of the other of the pair of second-class segmented conductors 8c” extends partially between the first head section 65 and the first axial face side 4 of one of the second-class segmented conductors 8c’. In particular, as seen toward the first face side 4, the section between the fourth radial bend 62 and the third combined bend 63 of the other of the second-class segmented conductors 8c” is covered by the section between the turning section 57 and the first radial bend 58 of one of the second-class segmented conductors 8c’.

[0130] According to an alternative embodiment, some windings 14a-d are connected in series or a combination of parallel and series connections. For example, two partial windings 14a, b can be connected in series, and another two partial windings 14c, d can be connected in series, with the series-connected portions potentially connected in parallel.

[0131] Figure 11 This is a schematic diagram of a vehicle 100 having an embodiment of an electric drive 101.

[0132] The electric drive includes a motor 102, a gearbox 103 mechanically connected to the motor 102, and an inverter 104.

[0133] Motor 102 includes a stator 1 according to any of the embodiments described above and a rotor 105 rotatably mounted relative to the stator 1. Motor 102 may be a synchronous motor. Rotor 105 may be permanently energized or electrically energized. Alternatively, motor 102 may be an induction motor.

[0134] Inverter 104 is configured to supply N-phase alternating current to stator 1.

[0135] Electric vehicle 100 may be a battery electric vehicle. Alternatively, electric vehicle 100 may include another internal combustion engine (not shown) and be a hybrid vehicle.

Claims

1. A stator (1) for an electric motor (102), the stator (1) comprising a stator core (2) and a stator winding (7), the stator core (2) having a longitudinal axis (3), an axial first face (4) and an axial second face (5), the axial second face (5) being opposite to the first face (4) and forming a plurality of slots (6) extending from the first face (4) to the second face (5), the stator winding (7) comprising N phase windings (U, V, W), wherein N≥2; wherein – The stator winding (7) is formed by segmented conductors (8a-d, 8c', 8c"), which form legs (9, 9', 9”, 9a-f, 15, 16) and connecting parts (10a, 10b). Each leg (9, 9', 9”, 9a-f, 15, 16) is arranged in one of the slots (6). Each connecting part (10a, 10b) is electrically connected to two legs (9, 9', 9”, 9a-f, 15, 16) at one of the face sides (4, 5). – The slot (6) is subdivided into layers 1 to L (20a-f), which are numbered in order from the outside to the inside in the radial direction, where L≥4 and is an even number; – The segmented conductor (8a-d, c', c) includes a first type of segmented conductor and a second type of segmented conductor. Each segmented conductor has a head (11a) disposed on the first surface side (4). The head (11a) connects the first leg of the legs at the first connection point (50) to the second leg (9a-f, 9") of the legs at the second connection point (51), such that the legs (9a-f, 9', 9") are spaced apart by a certain number of slots (6) in the circumferential direction. – The legs (9a-f, 9', 9") of the first type of segmented conductor (8a) are disposed in different layers (20a-f), and the head (11a) of the first type of segmented conductor (8a) extends axially to a first axial position (52), the first axial position (52) having a predetermined distance (53) from the first surface side (4). – The legs (9a-f, 9', 9") of the second type segmented conductor (8c, c', c) are disposed in the L layer, and the head (11a) of the second type segmented conductor (8c, c', c) extends axially to a second axial position (54), the second axial position (54) having a second predetermined distance (55) from the first surface side (4), the second predetermined distance (55) being greater than the first predetermined distance (53); - Each phase winding (U, V, W) includes at least one second-class segmented conductor (8c, c', c”); –The head (11a) of each Class II segmented conductor (8c, c', c) includes: (i) In the first combined bend (56) between the first connection point (50) and the second connection point (51), the head portion (11a) extends obliquely beyond the first combined bend (56), into the first orientation in the circumferential direction and into the axial direction away from the first surface side (4). (ii) A steering bend (57) is located between the first combined bend (56) and the second connection point (51), and the head (11a) extends circumferentially beyond the steering bend (57) along the circumferential direction in a second orientation opposite to the first orientation. (iii) A first radial bend (58) oriented radially outward between the turning bend (57) and the second connection point (51); (iv) A second radially curved portion (59) oriented radially inward between the first radially curved portion (58) and the second connection point (51), (v) A second combined bend (60) between the second radial bend (59) and the second connecting portion (21), wherein the head (11a) extends obliquely beyond the second combined bend (60), into the second orientation in the circumferential direction and into the axial direction toward the first surface side (4); wherein Between the first combined curved portion (56) and the first radial curved portion (58), the head (11a) forms a first head segment (64), which extends radially to a first radial position; wherein, Between the steering bend (57) and the second combined bend (60), the head (11a) forms a second head segment (65), which extends at the second axial position (54); wherein, – Beyond the second radial bend (59), the head (11a) forms a third head segment (66), which extends at a second radial position further outward than the first radial position; in which –The circumferentially adjacent second-class segmented conductors (8c, c', c") of different phase windings (U, V, W) are arranged such that the second head section (65) of one segmented conductor in the pair extends partially along the third head section (66) of the other segmented conductor in the pair.

2. The stator according to claim 1, wherein, Outside the second combined bend (59), the head of another segment conductor in the pair of second-class segment conductors (8c, c') extends between the first head section (64) of one of the segment conductors in the second-class segment conductors (8c, c') and the first axial face side (4).

3. The stator according to claim 1 or 2, wherein, The head (11a) of each Class II segmented conductor (8c, c', c) also includes: (vi) A third radial bend (61) is radially inwardly oriented between the second combined bend (60) and the second connection point (51); The third head section (66) is formed between the second radial bend (59) and the third radial bend (61).

4. The stator according to claim 3, wherein, The head (11a) of each Class II segmented conductor (8c, c', c) also includes: (vii) A fourth radial bend (62) oriented radially outward between the third radial bend (61) and the second connection point (51); Between the fourth radial bend (62) and the second connection point (51), the head (11a) forms a fourth head segment (67), which extends at a third radial position that is radially inward from the second radial position.

5. The stator according to any one of the preceding claims, wherein, The head (11a) of each Class II segmented conductor (8c, c', c) also includes: (viii) A third combined bend (63), wherein the head (11a) extends axially toward the second connection point (51) beyond the third combined bend (63) at the circumferential position of the second connection point (51).

6. The stator according to any one of the preceding claims, wherein, Each phase winding (U, V, W) includes first to A-th section windings (14a-d), each section winding (14a-d) forming a current path of multiple legs (9, 9', 9”, 9a-f, 15, 16) connected in series from the starting leg (15) of the legs (9, 9', 9”, 9a-f, 15, 16) to the ending leg (16) of the legs (9, 9', 9”, 9a-f, 15, 16), where A≥2, and for each section winding (14a-d), a second-class segmented conductor (8c, 8c', 8c”) is provided.

7. The stator according to any one of the preceding claims, wherein, The stator winding (7) has 2•P poles, wherein for each pole and phase winding (U, V, W), the slots form winding regions (22, 22a, 22b) that extend over all L layers (20a-f) and over q slots (6) in each layer (20a-f) to include L•q consecutive receiving positions for the legs (9, 9', 9”, 9a-f, 15, 16) of the same phase winding.

8. The stator according to claim 7, wherein, The legs (9, 9', 9”, 9a-f, 15, 16) of the second type segmented conductor (8c, c', c) are circumferentially spaced apart by N•q slots (6) with a pitch.

9. The stator according to claim 7 or 8, when subordinate to claim 6, In it A≥q+1 and A≠x•q, where x is an integer; For each phase winding (U, V, W), one of the winding regions (22, 22a, 22b) is the starting winding region (22a), and one of the winding regions (22, 22a, 22b) is the ending winding region (22b). Exactly one winding region (22, 22a, 22b) of each of the other phase windings (U, V, W) is circumferentially arranged between the starting winding region (22a) and the ending winding region (22b). The starting leg (15) of the corresponding partial winding (14a-d) of the phase winding (U, V, W) is disposed in the starting winding region (22a), and the ending leg (16) of the corresponding partial winding (14a-d) of the phase winding (U, V, W) is disposed in the ending winding region (22b).

10. The stator according to claim 9, wherein, The (2•i)th layer and the (2•i-1)th layer (20a-f) form the i-th double layer (21a-c). For all 1≤i≤L / 2, the starting legs (15) of the q partial windings (14a-c) of a corresponding phase winding in the phase windings (U, V, W) are arranged in the y-th double layer (21a), where 1≤y≤L / 2. –y=1; and / or – The q initial legs (15) of the partial winding (14a-c) are arranged in the same layer (20a) of the yth double layer (21a); ​​and / or – The q end legs (16) of the partial windings (14a-c) are arranged in the yth double layer (21a); ​​and / or –The one or more starting legs (16) of the partial winding (14d) (Aq) are arranged in the (y+1) or (y-1) double layer (21b); and / or – The end leg (6) or end leg (16) of a portion of the winding (14d) (Aq) is arranged in the first double layer (21a).

11. The stator according to claim 9 or 10, wherein, In each partial winding (14a-d), the legs (9, 9', 9”, 9a-f, 15, 16) are arranged in the first to (2•P•q•L / A) receiving positions, which define the leg pattern for the receiving positions of the partial winding (14a-d), the numbering of the receiving positions corresponding to the order of the legs (9, 9', 9”, 9a-f, 15, 16) along the current path, and the starting leg (15) is arranged in the first receiving space, wherein for all 1≤j≤A-1, the leg pattern of the (j+1)th partial winding (14b-d) corresponds to the leg pattern of the first partial winding (14a) shifted by 2•N•q•j slots (6) in a predetermined orientation in the circumferential direction, and the leg pattern of the (j+1)th partial winding (14b-d) is the leg pattern of the first partial winding (14a).

12. The stator according to any one of claims 9 to 11, wherein, – The current path of the first portion of the winding (14a) includes a first sub-path to the Lth sub-path (25a-f) numbered sequentially along the current path, wherein the first sub-path (25a) includes the starting leg (15); in which – Each sub-path (25a-f) includes the first to (3•P / 2) legs (9a-f) arranged in alternating layers (20a-f) of the same double layer (21a-c).

13. The stator according to claim 12, wherein, – For all 1≤k≤L / 2, the legs (9a-f) of the k-th subpath (25a-c) are arranged in the k-th double layer (21a-c), and for all L / 2+1≤L≤L, the legs (9a-f) of the L-th subpath (25d-f) are arranged in the (L+1-l)-th double layer (21a-c); and / or – The first to (L / 2)th sub-paths (25a-c) extend around the longitudinal axis (3) in a first orientation in the circumferential direction, and the [(L / 2)+1] to Lth sub-paths (25d-f) extend around the longitudinal axis (3) in a second orientation in the circumferential direction, the second orientation being opposite to the first orientation; and / or – The first leg (9a) of the first sub-path (25a) and the (3•P / 2) leg (9f) of the Lth sub-path (25f) are arranged in the same layer (20-c); and / or – The (3•P / 2) leg (9f) of the (L / 2) subpath (25c) and the first leg (9a) of the [(L / 2)+1)] subpath (35d) are configured on the same layer (20f).

14. Motor (102), including: – Stator (1) according to any one of the preceding claims; and - Rotor (105), which is rotatably mounted in the stator core (2) about the longitudinal axis (3).

15. The motor according to claim 14, wherein, The rotor (105) includes - Rotor core, the rotor core having two axial facets. – Rotor windings that extend from the rotor core. The outer radial periphery of the rotor winding and the inner radial periphery of the stator (1) face each other and form an annular space with a predetermined radial range therebetween.

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