Concentrated stator winding, stator and motor

Abstract

The utility model provides a concentrated stator winding, a stator and a motor, the concentrated stator winding comprises a multi-phase winding, any phase winding is formed by winding a lead, any phase winding comprises a plurality of winding coils which are sequentially arranged along the circumferential direction of a stator iron core, adjacent winding coils are connected through a connecting overline, the connecting overline is arranged at the radial inner side of each phase winding, and the connecting overline is arranged at the radial inner side of each phase winding. The wire inlet end and the wire outlet end of each phase winding are located on the two adjacent winding coils respectively, and the wire inlet end and the wire outlet end of each phase winding are arranged on the two axial sides of the adjacent winding coils respectively in the axial direction of the winding coils. The beneficial effects of the utility model are that the outer diameter of the stator core can be increased, so that the output torque and the output power of the motor are improved, the technological process is simplified, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technical field especially, it is a kind of centralized stator winding, stator and motor. BACKGROUND

[0002] In prior art, for centralized stator winding, each phase winding is connected by a plurality of winding coils in series, and the connection cross-line between adjacent winding coils is located at the outer circle of the phase winding. Due to the length limitation of the connection cross-line, the outer diameter of the stator core cannot be too large, and the design of the outer diameter of the stator core is limited, thereby the output power and torque of the motor are limited. SUMMARY

[0003] In view of the above problems, the utility model provides a kind of centralized stator winding, stator and motor to solve the above or other former problems existing in prior art.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of: a centralized stator winding, comprising a plurality of phase windings, any phase winding is wound by a wire, any phase winding comprises a plurality of winding coils arranged in sequence along the circumferential direction of the stator core, adjacent winding coils are connected by a connection cross-line, the connection cross-line is arranged on the radial inner side of each phase winding, the wire inlet end and the wire outlet end of each phase winding are located on the adjacent two winding coils respectively, along the axial direction of the winding coil, the wire inlet end and the wire outlet end of each phase winding are arranged on the axial two sides of the adjacent winding coil respectively.

[0005] Further, the wire inlet end and the wire outlet end of each phase winding are arranged on the radial inner side of the phase winding.

[0006] Further, the connection cross-line of all phase windings is arranged on the radial inner side of the stator core, and the wire inlet end and the wire outlet end of all phase windings are arranged on the radial inner side of the stator core.

[0007] Further, the winding coil comprises a coil body and a coil wire inlet end and a coil wire outlet end connected to the coil body respectively, along the axial direction of the coil body, the coil wire inlet end and the coil wire outlet end are arranged on the axial two sides of the coil body respectively, and the coil wire inlet end and the coil wire outlet end are arranged on the radial inner side of any phase winding.

[0008] Further, the coil body comprises an inner turning portion, a first straight portion and a second straight portion connected to the two ends of the inner turning portion respectively, and an outer turning portion connected to the first straight portion and the second straight portion, the inner turning portion is arranged on the radial inner side of the stator core, the outer turning portion is arranged on the radial outer side of the stator core, the first straight portion and the second straight portion are arranged along the radial direction of the stator core, and the first straight portion and the second straight portion are arranged in the slot on the circumferential two sides of a tooth of the stator core respectively.

[0009] Further, the coil wire inlet end is connected with the first straight part, and the coil wire outlet end is connected with the second straight part.

[0010] Further, along the axial direction of the coil body, the first straight part and the second straight part have the same height.

[0011] Further, the conductive wire constituting the winding coil and the connecting cross wire are both flat copper wires.

[0012] Further, the axis of any phase winding is coaxially arranged with the axis of the stator core.

[0013] Further, the winding coil is integrally formed by winding a single conductive wire along the axial direction of the tooth of the stator core.

[0014] A stator comprises a stator core and the concentrated stator winding as described above, the concentrated stator winding being arranged on the stator core, and the outer corner of the tooth of the stator core being a rounded corner structure.

[0015] An electric machine comprises the stator as described above.

[0016] Thanks to the above technical scheme, the wire inlet end and the wire outlet end of each phase winding in the concentrated stator winding are arranged on the radial inner side of the stator winding, the wire inlet end and the wire outlet end of any phase winding are arranged on the adjacent two winding coils respectively, and the wire inlet end and the wire outlet end of any phase winding are located on the axial two sides of the adjacent two winding coils, the adjacent two winding coils in each phase winding are connected through the connecting cross wire, the connecting cross wire is arranged on the radial inner side of the stator winding, so that the radial outer side of the stator winding does not have the connecting cross wire and the wire inlet end and the wire outlet end, so that the outer diameter of the stator core can be increased, and thus the output torque and the output power of the electric machine are improved, and the process is simplified, and the production cost is reduced; the outer corner of the tooth of the stator core is rounded, so that when the winding coil is wound on the tooth of the stator core, the conductive wire is tightly attached to the outer circle of the outer rounded corner structure of the tooth, the height of the radial outer end of the winding coil is reduced, the outer boundary of the stator core is increased, and the output torque density and the power density of the electric machine are further improved; the radial inner side of the tooth of the stator core is not rounded, so that the electric load at the position is not too high or saturated. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective structural schematic view of a stator of an embodiment of the utility model;

[0018] Figure 2 is a front view structural schematic view of a stator of an embodiment of the utility model;

[0019] Figure 3is a structural schematic view of a stator winding of an embodiment of the utility model;

[0020] Figure 4 is a three-dimensional structural schematic view of a phase winding of an embodiment of the utility model;

[0021] Figure 5 is a front view structural schematic view of a phase winding of an embodiment of the utility model;

[0022] Figure 6 is a plan view structural schematic view of a phase winding of an embodiment of the utility model;

[0023] Figure 7 is an A-A cross-sectional view structural schematic view of a winding coil of an embodiment of the utility model;

[0024] Figure 8 is a structural schematic view of a winding coil of an embodiment of the utility model.

[0025] In the drawings:

[0026] 1, stator winding 2, stator core 10, winding coil

[0027] 11, connecting cross line 12, incoming wire end 13, outgoing wire end

[0028] 100, coil incoming wire end 101, coil outgoing wire end 102, first straight line part

[0029] 103, second straight line part 104, outer side turning part 105, inner side turning part DETAILED DESCRIPTION

[0030] The utility model will be further explained in connection with the drawings and specific embodiments.

[0031] Figure 1 The structure schematic view of an embodiment of the utility model is shown, and the embodiment relates to a concentrated stator winding, a stator and a motor, in any phase winding of the concentrated stator winding, the connecting cross line of the winding coil is arranged at the inner side of the concentrated stator winding, the incoming wire end and the outgoing wire end of the concentrated stator winding are arranged at the inner side of the concentrated stator winding, which simplifies the technological process, reduces the production cost, and simultaneously, as the outer side of the stator core does not have the connecting cross line and the outgoing wire, the outer diameter of the stator core can be further enlarged, and the output power and the torque of the motor are improved.

[0032] A concentrated stator winding, such as Figures 1-3As shown, the system includes multi-phase windings, all of which are mounted on the stator core 2. The stator winding 1 has a circular ring structure, and each phase winding constituting the stator winding 1 also has a circular ring structure. The structures of each phase winding are identical, except that the amount of space occupied by the windings on the stator core 2 is different. The stator winding 1 and the stator core 2 are coaxially arranged, as shown... Figure 2 As shown, the AB direction is the axial direction of the stator core 2. Similarly, the axial direction of the stator winding 1 is also the AB direction. Each phase winding is made of a single conductor and is integrally formed.

[0033] In any phase winding, such as Figures 4-8 As shown, it includes multiple winding coils 10 arranged sequentially along the circumferential direction of the stator core 2. Each winding coil 10 is fitted onto a tooth of the stator core 2. Adjacent winding coils 10 are connected by connecting cross wires 11. That is, in any phase winding, along the circumferential direction of the stator core 2, each winding coil 10 is connected sequentially by connecting cross wires 11, so that multiple winding coils 10 are connected in series to form the structure of a phase winding. Two adjacent winding coils 10 are connected by a connecting crossover 11. The connecting crossover 11 is located on the radial inner side of the phase winding. Depending on the installation method of the phase winding on the stator core 2, the connecting crossover 11 is also located on the radial inner side of the stator core 2. When the connecting crossover 11 is connected to two adjacent winding coils 10, one end of the connecting crossover 11 is connected to the coil output terminal 101 of one winding coil 10, and the other end of the connecting crossover 11 is connected to the coil input terminal 100 of the other winding coil 10, thus connecting the two winding coils 10 in series. The connecting crossover 11 is a conductor and is fixedly connected to the coil input terminal 100 and the coil output terminal 101 of the winding coil 10. The fixed connection method is preferably integrally formed.

[0034] In some feasible embodiments, preferably, any phase winding is integrally formed by winding a single conductor according to a designed winding method, with the inlet end of the conductor being the inlet end 12 of the phase winding and the outlet end of the conductor being the outlet end 13 of the phase winding.

[0035] Each phase winding has an incoming terminal 12 and an outgoing terminal 13, the incoming terminal 12 and the outgoing terminal 13 of the phase winding are located on two adjacent winding coils 10 respectively, the incoming terminal 12 and the outgoing terminal 13 are located on the axial two sides of the adjacent winding coils 10 along the axial direction of the winding coils 10, that is, the incoming terminal 12 of the phase winding is located on one winding coil 10 of the two adjacent winding coils 10, and the outgoing terminal 13 of the phase winding is located on the other winding coil 10 of the two adjacent winding coils 10, the axial direction of the winding coil 10 is arranged in parallel with the axial direction of the stator winding 1, then the axial direction of the winding coil 10 is also arranged in parallel with the axial direction of the stator core 2, the winding coil 10 has an upper side and a lower side, the incoming terminal 12 of the phase winding is located on the upper side of one winding coil 10 of the two adjacent winding coils 10, and the outgoing terminal 13 of the phase winding is located on the lower side of the other winding coil 10 of the two adjacent winding coils 10, the incoming terminal 12 and the outgoing terminal 13 of the phase winding are not located in the same plane.

[0036] The incoming terminal 12 and the outgoing terminal 13 of each phase winding are located on the radial inner side of the phase winding, so that the connection cross-over wire 11 connecting the two adjacent winding coils 10 is located on the radial inner side of the phase winding, the connection cross-over wire 11 connects the two adjacent winding coils 10, and the connection cross-over wire 11 is located on the radial inner side of the stator winding 1. By arranging the connection cross-over wire 11 connecting the winding coils 10 of each phase winding on the radial inner side of the phase winding, and arranging the incoming terminal 12 and the outgoing terminal 13 of each phase winding on the radial inner side of the phase winding, the radial outer side of each phase winding is not provided with the connection cross-over wire 11 and the incoming terminal 12 and the outgoing terminal 13 of the phase winding, so that the gap between the radial outer side of the stator winding 1 and the motor housing is not provided with the connection cross-over wire 11 and the incoming and outgoing wires, thereby increasing the outer diameter of the stator core 2, and further increasing the outer diameter of the stator, which can further improve the output power and output torque of the motor, and also simplifies the process and reduces the production cost.

[0037] The structures of the phase windings are the same, so in the concentrated stator winding, the connection cross-over wires 11 of all the phase windings are located on the radial inner side of the stator winding, and the incoming terminals 12 and the outgoing terminals 13 of all the phase windings are located on the radial inner side of the stator winding, that is, the connection cross-over wires 11 of all the phase windings are located on the radial inner side of the stator core 2, and the incoming terminals 12 and the outgoing terminals 13 of all the phase windings are located on the radial inner side of the stator core 2.

[0038] Specifically, as shown in Figure 7 and 8As shown in the drawings, the winding coil 10 comprises a coil body and a coil incoming wire end 100 and a coil outgoing wire end 101 connected to the coil body respectively, along the axial direction of the coil body (the axial direction of the coil body is arranged in parallel with the axial direction of the stator core 2), the coil body has an upper side and a lower side, when the coil incoming wire end 100 and the coil outgoing wire end 101 are connected to the coil body, the coil incoming wire end 100 and the coil outgoing wire end 101 are respectively arranged on the two axial sides of the coil body, the coil incoming wire end 100 can be arranged on the upper side of the coil body, the coil outgoing wire end 101 can be arranged on the lower side of the coil body, or the coil incoming wire end 100 can be arranged on the lower side of the coil body, the coil outgoing wire end 101 can be arranged on the upper side of the coil body, the coil incoming wire end 100 and the coil outgoing wire end 101 are not arranged on the same side of the coil body, the coil incoming wire end 100 and the coil outgoing wire end 101 are arranged along the radial direction of the stator core 2, and the coil incoming wire end 100 and the coil outgoing wire end 101 are arranged on the radial inner side of any phase winding, so that the connection cross wire 11 connecting two winding coils 10 is arranged on the radial inner side of the phase winding.

[0039] The coil body is of a ring structure, the shape of the coil body is adapted to the shape of the tooth of the stator core 2, and the coil body is sleeved on a tooth of the stator core 2 when the coil body is installed on the stator core 2. The coil body comprises an inner turning portion 105, a first straight portion 102 and a second straight portion 103 connected to the two ends of the inner turning portion 105 respectively, and an outer turning portion 104 connected to the first straight portion 102 and the second straight portion 103, the coil incoming wire end 100 is connected to the first straight portion 102, and the coil outgoing wire end 101 is connected to the second straight portion 103, the first straight portion 102 and the second straight portion 103 are respectively arranged in the slots on the two sides of a tooth of the stator core 2, the inner turning portion 105 is arranged on the radial inner side of the stator core 2, corresponding to the radial inner side of the tooth of the stator core 2 close to the axis of the stator core 2, the outer turning portion 104 is arranged on the radial outer side of the stator core 2, corresponding to the radial outer side of the tooth of the stator core 2 away from the axis of the stator core 2, the two ends of the first straight portion 102 are fixedly connected to a group of corresponding end portions of the inner turning portion 105 and the outer turning portion 104 respectively, and the two ends of the second straight portion 103 are fixedly connected to another group of corresponding end portions of the inner turning portion 105 and the outer turning portion 104 respectively, thereby forming the overall structure of the coil body of a ring shape.

[0040] The first straight portion 102 and the second straight portion 103 each include a plurality of conductive wires, and the shape of the conductive wires constituting the first straight portion 102 and the second straight portion 103 is linear. The plurality of conductive wires are arranged in sequence in the axial direction of the coil body, i.e., the second conductive wire is placed above the first conductive wire, the third conductive wire is placed above the second conductive wire, and so on. The plurality of conductive wires are located in the same plane and constitute a conductive wire group, forming the structure of the first straight portion 102 and the structure of the second straight portion 103, so that the first straight portion 102 and the second straight portion 103 can be arranged in the slot of the stator core 2.

[0041] The outer turning portion 104 and the inner turning portion 105 each also include a plurality of conductive wires, and the shape of the conductive wires constituting the outer turning portion 104 and the inner turning portion 105 is arc-shaped. According to the shape of the teeth of the stator core 2, the shape of the conductive wires of the inner turning portion 105 is preferably semicircular or inferior arc-shaped. The conductive wires of the outer turning portion 104 include a linear segment and arc-shaped segments arranged at both ends of the linear segment. The linear segment is fixedly connected with the arc-shaped segments, and the arc-shaped segments serve as a transition to facilitate the connection of both ends of the linear segment with the corresponding conductive wires in the first straight portion 102 and the second straight portion 103, respectively. The shape of the arc-shaped segments is adapted to the shape of the outer corner of the teeth of the stator core 2, i.e., the outer corner of the teeth of the stator core 2 is rounded to enable the outer turning portion 104, the first straight portion 102, and the second straight portion 103 to closely fit the circumferential side surfaces and the axial outer side surface of the teeth of the stator core 2 when the coil body is sleeved on the teeth of the stator core 2. The plurality of conductive wires of the outer turning portion 104 and the inner turning portion 105 are arranged in sequence in the axial direction of the coil body, i.e., the second conductive wire is arranged on the first conductive wire, the third conductive wire is arranged on the second conductive wire, and so on. The plurality of conductive wires are located in the same plane and constitute a conductive wire group, forming the structure of the outer turning portion 104 and the structure of the inner turning portion 105.

[0042] Any wire of the first straight section 102 is fixedly connected with the corresponding wire of the inner side turning section 105 and the outer side turning section 104 respectively, and any wire of the second straight section 103 is fixedly connected with the corresponding wire of the inner side turning section 105 and the outer side turning section 104 respectively. The fixed connection mode of the first straight section 102 with the outer side turning section 104 and the inner side turning section 105 is preferably one-piece forming, and the fixed connection mode of the second straight section 103 with the outer side turning section 104 and the inner side turning section 105 is preferably one-piece forming. Therefore, when the coil body is prepared, the coil body is formed by winding a wire along the circumferential direction of the teeth of the stator core 2 and along the axial direction of the stator core 2 in sequence, that is, when the coil body is prepared, the wire is first wound along the circumferential direction of the teeth of the stator core 2 for one turn, then moved along the axial direction of the stator core 2 by one thickness of the wire, and then wound for the second turn, then moved along the axial direction of the stator core 2 by one thickness of the wire, and then wound for the third turn, and so on. The wire is wound along the circumferential direction of the teeth of the stator core 2 and moved along the axial direction of the stator core 2 in sequence to perform multiple turns of winding, thereby forming a ring-shaped coil body structure with a certain height. The two ends of the wire are located at the lower side and the upper side of the coil body respectively, which are the coil wire inlet end 100 and the coil wire outlet end 101 respectively.

[0043] Due to the existence of the coil wire inlet end 100 and the coil wire outlet end 101, along the axial direction of the coil body, there is a height difference between the two ends of the inner side turning section 105, so that the winding of one layer of the wire coil in the adjacent two layers is completed and then another layer of the wire coil is wound. In the same layer of the wire coil, the wires of the first straight section 102, the wires of the second straight section 103 and the wires of the outer side turning section 104 are located in the same plane, thereby making the conductors of the first straight section 102, the conductors of the second straight section 103 and the conductors of the outer side turning section 104 on the upper side of the coil body located in the same plane, and the conductors of the first straight section 102, the conductors of the second straight section 103 and the conductors of the outer side turning section 104 on the lower side of the coil body located in the same plane, that is, along the axial direction of the coil body, the height of the first straight section 102 is the same as that of the second straight section 103.

[0044] According to the structure of the stator, in the stator winding 1, the axis of any phase winding is coaxially arranged with the axis of the stator core 2, and the axis of any winding coil 10 is arranged in parallel with the axis of the stator core 2.

[0045] In some implementable embodiments, preferably, the wires constituting the winding coils 10 and the connection cross wires 11 are all flat copper wires.

[0046] The specific structure of any phase winding in the stator winding 1 will be described below, taking a phase winding with six winding coils 10 as an example for illustration.

[0047] In a phase winding, six winding coils 10 are sequentially arranged along the circumferential direction of the stator core 2, the winding coil 10 arranged at the inlet end 12 of the phase winding is the first winding coil 10, and the winding coil 10 arranged at the outlet end 13 of the phase winding is the last winding coil 10. The coil inlet end 100 of the first winding coil 10 is located at the axial lower side of the winding coil 10. After winding the wire along the circumferential direction of the tooth of the stator core 2 for one turn, the wire is moved upward along the axial direction of the winding coil 10 by the thickness of the wire, and then the wire is wound for the second turn. After multiple turns of winding are sequentially performed, after the last turn of winding is completed, the coil outlet end 101 of the winding coil 10 is connected to the coil inlet end 100 of the second winding coil 10 through the connecting cross wire 11. The winding method of the second winding coil 10 is the same as that of the first winding coil 10. The coil outlet end 101 of the second winding coil 10 is connected to the coil inlet end 100 of the third winding coil 10 through the connecting cross wire 11. Similarly, the coil outlet end 101 of the fifth winding coil 10 is connected to the coil inlet end 100 of the sixth winding coil 10 through the connecting cross wire 11, and the winding of a phase winding is completed. Wherein, the coil inlet end 100 of each winding coil 10 is located at the axial lower side of the winding coil 10, and the coil outlet end 101 of each winding coil 10 is located at the axial upper side of the winding coil 10. The coil inlet end 100 and the coil outlet end 101 are located at the radial inner side of the stator core 2. One end of the connecting cross wire 11 is connected to the coil outlet end 101 at the axial upper side of one winding coil 10, and the other end is connected to the coil inlet end 100 at the axial lower side of another winding coil 10. The coil inlet end 100 of the first winding coil 10 is the inlet end 12 of the phase winding, and the coil outlet end 101 of the sixth winding coil 10 is the outlet end 13 of the phase winding. In the structure of the stator winding 1, winding coils 10 of other phases are arranged between adjacent winding coils 10.

[0048] A stator, as shown in Figure 1 The stator core 2 has a tooth, and the outer corner of the tooth is a rounded structure. The outer corner of the tooth of the stator core 2 is rounded to form a rounded structure, which is adapted to the arc-shaped segment of the winding coil 10, so that the outer corner of the winding coil 10 can be attached to the radial outer side of the tooth of the stator core 2.

[0049] A motor, comprising a stator as described above.

[0050] With the above technical scheme, the wire inlet end and the wire outlet end of each phase winding in the concentrated stator winding are arranged at the radially inner side of the stator winding, the wire inlet end and the wire outlet end of any phase winding are arranged on the adjacent two winding coils respectively, and the wire inlet end and the wire outlet end of any phase winding are located at the axial two sides of the adjacent two winding coils respectively, the adjacent two winding coils in each phase winding are connected through the connecting cross wire, the connecting cross wire is arranged at the radially inner side of the stator winding, so that the radially outer side of the stator winding does not have the connecting cross wire and the wire inlet end and the wire outlet end, so that the outside diameter of the stator core can be increased, and then the output torque and the output power of the motor are improved, and the process is simplified, and the production cost is reduced; the outside corner of the tooth of the stator core is chamfered, so that when the winding coil is wound on the tooth of the stator core, the wire is close to the outside circle of the chamfered structure of the tooth, the radial outer end height of the winding coil is reduced, the outside boundary of the stator core is increased, and the output torque density and the power density of the motor are further improved; the radially inner side of the tooth of the stator core is not chamfered, so that the electric load at the position is not too high or saturated.

[0051] The above detailed description of the embodiments of the utility model, but the content described can only be the preferred embodiment of the utility model, and cannot be considered as limiting the scope of the utility model. Any equivalent changes and improvements made within the scope of the utility model application should still belong to the patent coverage of the utility model.

Claims

1. A concentrated stator winding, comprising multi-phase windings, wherein each phase winding is wound from a single conductor, and each phase winding comprises a plurality of winding coils arranged sequentially along the circumferential direction of the stator core, and adjacent winding coils are connected by connecting crossover wires, characterized in that: The connecting crossover is located on the radial inner side of each phase winding. The input and output ends of each phase winding are respectively located on two adjacent winding coils. Along the axial direction of the winding coils, the input and output ends of each phase winding are respectively located on both sides of the axial direction of the adjacent winding coils.

2. The concentrated stator winding according to claim 1, characterized in that: The input and output terminals of each phase winding are located on the radial inner side of that phase winding.

3. The concentrated stator winding according to claim 2, characterized in that: All phase winding connection crossovers are located on the radial inner side of the stator core, and the input and output terminals of all phase windings are located on the radial inner side of the stator core.

4. The concentrated stator winding according to any one of claims 1-3, characterized in that: The winding coil includes a coil body and a coil inlet and a coil outlet connected to the coil body respectively. Along the axial direction of the coil body, the coil inlet and the coil outlet are respectively located on both sides of the axial direction of the coil body. The coil inlet and the coil outlet are both located on the radial inner side of any phase winding.

5. The concentrated stator winding according to claim 4, characterized in that: The coil body includes an inner turning portion, a first straight portion and a second straight portion connected to both ends of the inner turning portion, and an outer turning portion connected to both the first straight portion and the second straight portion. The inner turning portion is located on the radial inner side of the stator core, and the outer turning portion is located on the radial outer side of the stator core. The first straight portion and the second straight portion are both arranged along the radial direction of the stator core. The first straight portion and the second straight portion are respectively located in the slots on both sides of the circumferential direction of a tooth of the stator core.

6. The concentrated stator winding according to claim 5, characterized in that: The coil inlet is connected to the first straight section, and the coil outlet is connected to the second straight section. Along the axial direction of the coil body, there is a height difference between the two ends of the inner bend.

7. The concentrated stator winding according to claim 6, characterized in that: Along the axial direction of the coil body, the first straight portion and the second straight portion have the same height.

8. The concentrated stator winding according to any one of claims 1-3 and 5-7, characterized in that: The conductors constituting the winding coil and the connecting crossover wires are all flat copper wires.

9. The concentrated stator winding according to claim 8, characterized in that: The axis of any phase winding is coaxial with the axis of the stator core.

10. The concentrated stator winding according to any one of claims 1-3, 5-7 and 9, characterized in that: The winding coil is formed by winding a single wire multiple times along the axial direction of the teeth of the stator core, and is integrally molded.

11. A stator, characterized in that: It includes a stator core and a concentrated stator winding as described in any one of claims 1-10, wherein the concentrated stator winding is disposed on the stator core, and the outer corners of the teeth of the stator core are rounded.

12. An electric motor, characterized in that: Including the stator as described in claim 11.

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