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 arranged on the same winding coil, and the wire inlet end and the wire outlet end are arranged on any layer between the two axial sides of the winding coil. The beneficial effects of the utility model are that the radial outer side of the stator winding is not provided with a connection overline, so that the outer side diameter of the stator iron core can be increased, 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 concentrated 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 limiting the output power and torque of the motor. SUMMARY

[0003] In view of the above problems, the utility model provides a kind of concentrated 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 concentrated 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 arranged on the same winding coil, and the wire inlet end and the wire outlet end are arranged on any layer between the axial two sides of the winding coil.

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

[0007] Further, the wire inlet end and the wire outlet end of each phase winding are arranged on the middle layer between the axial two sides of the winding coil.

[0008] Further, any phase winding comprises a first lead winding coil, a plurality of connection winding coils and a second lead winding coil connected in sequence, the first lead winding coil and the second lead winding coil are coaxially arranged, the first lead winding coil and the plurality of connection winding coils are sequentially arranged along the circumferential direction of the stator core, and the wire inlet end and the wire outlet end of any phase winding are arranged on the first lead winding coil and the second lead winding coil respectively.

[0009] Further, the axial layer number of the first lead winding coil and the axial layer number of the second lead winding coil are both less than the axial layer number of the connecting winding coil, the total height of the first lead winding coil and the second lead winding coil is consistent with the height of the connecting winding coil, and the coil inlet end of the first lead winding coil and the coil outlet end of the second lead winding coil are located at the same axial layer.

[0010] Further, the coil inlet end and the coil outlet end of the first lead winding coil are both arranged along the radial direction of the stator core, the coil inlet end and the coil outlet end of the first lead winding coil are located in the same slot of the stator core, the coil inlet end and the coil outlet end of the second lead winding coil are both arranged along the radial direction of the stator core, the coil inlet end and the coil outlet end of the second lead winding coil are located in the same slot of the stator core, and the coil inlet end of the first lead winding coil and the coil inlet end of the second lead winding coil are respectively located in the slots on both sides of the same tooth of the stator core.

[0011] Further, the connecting winding coil, the first lead winding coil and the second lead winding coil all include a coil body, the coil body includes an inner turning portion, a first straight portion and a second straight portion respectively connected to both ends of the inner turning portion, and an outer turning portion connected to the first straight portion and the second straight portion, the inner turning portion is located at the radial inner side of the stator core, the outer turning portion is located at 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, and the first straight portion and the second straight portion are respectively located in the slots on the circumferential two sides of the same tooth of the stator core.

[0012] Further, the conductive wire constituting the first lead winding coil, the conductive wire constituting the second lead winding coil and the conductive wire constituting the connecting winding coil are all flat copper wires.

[0013] Further, the connecting winding coil, the first lead winding coil and the second lead winding coil are all integrally formed by winding a conductive wire along the axial direction of the teeth of the stator core for multiple turns.

[0014] Further, the axis of any phase winding is coaxially arranged with the axis of the stator core.

[0015] A stator includes a stator core and the concentrated stator winding as described above, the concentrated stator winding is arranged on the stator core, and the outer corner of the tooth of the stator core is a rounded structure.

[0016] An electric machine includes the stator as described above.

[0017] With the above technical scheme, in the concentrated stator winding, two adjacent winding coils in each phase winding are connected through a connecting cross wire, the connecting cross wire is arranged at 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, so that the outer diameter of the stator core can be increased, thereby improving the output torque and output power of the motor, and simplifying the process and reducing the production cost; the wire inlet end and the wire outlet end of each phase winding are arranged at the radial outer side of the stator winding, the wire inlet end and the wire outlet end of any phase winding are arranged on the same winding coil, and the wire inlet end and the wire outlet end of any phase winding are located at any layer between the axial two sides of the winding coil, so that the winding coil is convenient to wind; the outer corner of the tooth of the stator core is chamfered, so that the wire is close to the outer circle of the outer corner structure of the tooth when the winding coil is wound on the tooth of the stator core, 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 power density of the motor are further improved; the radial inner side of the tooth of the stator core is not chamfered, so that the electrical load at the position is not too high or saturated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structure schematic view of a stator of an embodiment of the utility model;

[0019] Figure 2 is a structure schematic view of a concentrated stator winding of an embodiment of the utility model;

[0020] Figure 3 is a structure schematic view of a phase winding of an embodiment of the utility model;

[0021] Figure 4 is a structure schematic view of a lead winding coil of an embodiment of the utility model;

[0022] Figure 5 is a structure schematic view of a connecting winding coil of an embodiment of the utility model;

[0023] Figure 6 is a structure schematic view of a phase winding of an embodiment of the utility model (remove the second lead winding coil).

[0024] In the drawing:

[0025] 1, stator winding 2, stator core 10, first lead winding coil

[0026] 11, connecting winding coil 12, connecting cross wire 13, wire inlet end

[0027] 14, wire outlet end 15, second lead winding coil 103, outer corner

[0028] 104, first straight portion 105, second straight portion 106, coil wire inlet end

[0029] 107, coil wire outlet end 108, inner turning portion 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 the embodiment of the utility model is shown, 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 wire of connecting two adjacent winding coils is arranged at the radial inner side of the phase winding, the wire inlet end and the wire outlet end of the phase winding are arranged on the same winding coil, and the wire inlet end and the wire outlet end of the phase winding are both arranged at the middle same layer of winding coil, simultaneously, the wire inlet end and the wire outlet end of the phase winding are arranged at the radial outer side of the phase winding, simplify the technological process, reduce production cost, simultaneously because the outer side of stator core does not have connecting cross wire, makes the outer diameter of stator core can further increase, improves the output power and output torque of motor.

[0032] A concentrated stator winding, as shown in Figures 1-3 The multiple phase windings are all arranged on the stator core 2, the stator winding 1 is circular ring structure, each phase winding constituting the stator winding 1 is also circular ring structure, and the structure of each phase winding is same, only the tooth of the stator core 2 occupied when installing on the stator core 2 is different. The stator winding 1 is coaxially arranged with the stator core 2, that is, the axis of the stator winding 1 is arranged in parallel with the axis of the stator core 2, therefore, each phase winding is also coaxially arranged with the stator core 2. Each phase winding is wound by a wire and integrally formed.

[0033] Any phase winding comprises a plurality of winding coils arranged in sequence along the circumferential direction of the stator core 2, each winding coil is sleeved on a tooth of the stator core 2, adjacent winding coils are connected through a connecting cross wire 12, the connecting cross wire 12 is arranged at the radially inner side of any phase winding, that is, in each phase winding, along the circumferential direction of the stator core 2, each winding coil is connected in sequence through the connecting cross wire 12, so that the plurality of winding coils are connected in series to form the structure of a phase winding. The connecting cross wire 12 is arranged at the radially inner side of the phase winding, and according to the mounting mode of the phase winding on the stator core 2, the connecting cross wire 12 is also located at the radially inner side of the stator core 2. When the connecting cross wire 12 is connected with the adjacent two winding coils, one end of the connecting cross wire 12 is connected with the coil outlet end 107 of one winding coil, and the other end of the connecting cross wire 12 is connected with the coil inlet end 106 of the other winding coil, so as to connect the two winding coils in series. The connecting cross wire 12 is fixedly connected with the coil inlet end 106 and the coil outlet end 107 of the winding coil respectively, and the fixed connection mode is preferably integrally formed. The wire type of the connecting cross wire 12 is consistent with the wire type of the winding coil.

[0034] In some implementable embodiments, preferably, any phase winding is wound by a wire according to the designed winding mode, and is integrally formed. The inlet end of the wire is the inlet end 13 of the phase winding, and the outlet end of the wire is the outlet end 14 of the phase winding.

[0035] Each phase winding has an incoming terminal 13 and an outgoing terminal 14, the incoming terminal 13 and the outgoing terminal 14 of each phase winding are arranged on the same winding coil, and the incoming terminal 13 and the outgoing terminal 14 are arranged on any layer between the axial two sides of the winding coil, the incoming terminal 13 and the outgoing terminal 14 are arranged on the radial outer side of any phase winding, that is, in any phase winding, the incoming terminal 13 and the outgoing terminal 14 of the phase winding are arranged on any winding coil, the selection of the winding coil is selected according to the design requirements of the actual stator winding 1, which is not specifically required here. The axis of the winding coil is arranged in parallel with the axis of the stator winding 1, that is, the axis of the winding coil is arranged in parallel with the axis of the stator core 2, so that the winding coil has axial two sides (upper side and lower side) along its own axial direction, the incoming terminal 13 and the outgoing terminal 14 of the phase winding are arranged on any layer between the axial two sides of the same winding coil, that is, the incoming terminal 13 and the outgoing terminal 14 of the phase winding are not arranged on the axial upper side and the axial lower side of the winding coil, but are located between any layer between the uppermost layer (the layer where the upper side is located) and the lowermost layer (the layer where the lower side is located), that is, the incoming terminal 13 and the outgoing terminal 14 of the phase winding are located on the same layer, the layer where the incoming terminal 13 and the outgoing terminal 14 are located is selected according to the design requirements of the actual stator winding 1, which is not specifically required here. At the same time, when the incoming terminal 13 and the outgoing terminal 14 are arranged, the incoming terminal 13 and the outgoing terminal 14 are arranged along the radial direction of the stator core 2, the incoming terminal 13 and the outgoing terminal 14 are located on the radial outer side of the phase winding, according to the mounting mode of the stator winding 1 on the stator core 2, the incoming terminal 13 and the outgoing terminal 14 of any phase winding are also located on the radial outer side of the stator core 2, that is, in any phase winding, the connection cross-over wire 12 and the outgoing terminal (the incoming terminal 13, the outgoing terminal 14) are located on the radial inner side and the radial outer side of the stator core 2 respectively, the connection cross-over wire 12 is arranged on the radial inner side of the stator core 2, which simplifies the process and reduces the production cost, at the same time, the connection cross-over wire 12 is not arranged on the radial outer side of the stator core 2, which can further increase the outer diameter of the stator core 2 and improve the output torque and output power of the motor.

[0036] In some implementable embodiments, preferably, in order to facilitate the preparation of the winding coil provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding, the incoming terminal 13 and the outgoing terminal 14 of any phase winding are arranged on the middle layer between the axial two sides of the winding coil, that is, in the winding coil, the middle layer provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding is arranged above and below in the axial direction, and the winding coils above and below in the axial direction have the same structure, which is convenient for winding during preparation.

[0037] In the preparation of any phase winding, the winding coil provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding is prepared first, the winding coil below the axial direction of the coil winding is wound first, and the incoming terminal 13 of the phase winding is connected to the winding coil, the outgoing terminal of the winding coil is connected to a winding coil not provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding through the connecting cross-over 12, the winding coil is connected to the remaining winding coils not provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding through the connecting cross-over 12 in sequence, and the outgoing terminal of the last winding coil not provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding is connected to the winding coil above the axial direction of the winding coil provided with the incoming terminal 13 and the outgoing terminal 14 of the phase winding through the connecting cross-over 12, and the outgoing terminal of the winding coil is connected to the outgoing terminal 14 of the phase winding, thereby forming the structure of the phase winding.

[0038] The structures of the phase windings are the same, and therefore, in the concentrated stator winding, the connecting cross-overs 12 of all the phase windings are located on the radially inner side of the stator winding, and the incoming terminals 13 and the outgoing terminals 14 of all the phase windings are located on the radially outer side of the stator winding, that is, the connecting cross-overs 12 of all the phase windings are located on the radially inner side of the stator core 2, and the incoming terminals 13 and the outgoing terminals 14 of all the phase windings are located on the radially outer side of the stator core 2.

[0039] Specifically, as Figures 3-6As shown, according to the setting positions of the incoming terminal 13 and the outgoing terminal 14 of any phase winding, any phase winding comprises the first lead winding coil 10, the plurality of connection winding coils 11 and the second lead winding coil 15 connected in sequence, the first lead winding coil 10 and the second lead winding coil 15 are coaxially arranged, that is, the first lead winding coil 10 and the second lead winding coil 15 are arranged on the same tooth of the stator core 2, any connection winding coil 11 is arranged on a tooth of the stator core 2, the plurality of connection winding coils 11 are respectively arranged on different teeth of the stator core 2, the first lead winding coil 10 and the plurality of connection winding coils 11 are sequentially arranged along the circumferential direction of the stator core 2 and are respectively arranged on the teeth of the stator core 2 occupied by the phase winding, the incoming terminal 13 and the outgoing terminal 14 of any phase winding are respectively arranged on the first lead winding coil 10 and the second lead winding coil 15, that is, along the circumferential direction of the stator core 2, the first lead winding coil 10 is connected with the first connection winding coil 11, the first connection winding coil 11 is connected with the second connection winding coil 11, and so on, the last connection winding coil 11 is connected with the second lead winding coil 15, the coil incoming terminal 106 of the first lead winding coil 10 is connected with the incoming terminal 13 of the phase winding, the coil outgoing terminal 107 of the first lead winding coil 10 is connected with the connection winding coil 11 on one side through the connection cross-over 12, the coil incoming terminal 106 of the second lead winding coil 15 is connected with the connection winding coil 11 on the other side through the connection cross-over 12, and the coil outgoing terminal 107 of the second lead winding coil 15 is connected with the outgoing terminal 14 of the phase winding, thereby forming a phase winding structure.

[0040] The axial layer number of the first lead winding coil 10 and the axial layer number of the second lead winding coil 15 are both less than the axial layer number of the connection winding coil 11, that is, along the axial direction of the first lead winding coil 10, the height of the first lead winding coil 10 and the height of the second lead winding coil 15 are both less than the height of the connection winding coil 11, the height of each connection winding coil 11 is consistent, the height of the first lead winding coil 10 can be greater than the height of the second lead winding coil 15, or the height of the first lead winding coil 10 can be less than the height of the second lead winding coil 15, the height of the first lead winding coil 10 and the height of the second lead winding coil 15 are selected according to actual needs, the total height of the first lead winding coil 10 and the second lead winding coil 15 is consistent with the height of the connection winding coil 11, so that the stator winding is mounted on the stator core 2, the coil inlet end 106 of the first lead winding coil 10 and the coil outlet end 107 of the second lead winding coil 15 are located at the same axial layer, that is, along the axial direction of the first lead winding coil 10, the coil inlet end 106 of the first lead winding coil 10 and the coil outlet end 107 of the second lead winding coil 15 are respectively located on the opposite sides of the first lead winding coil 10 and the second lead winding coil 15, and the two sides are located on the same plane, so that the coil inlet end 106 of the first lead winding coil 10 and the coil outlet end 107 of the second lead winding coil 15 are located at the same axial layer of the winding coil formed by the first lead winding coil 10 and the second lead winding coil 11.

[0041] In some implementable embodiments, the second lead winding coil 15 and the first lead winding coil 10 are arranged up and down along the axial direction of the stator core 2, the first lead winding coil 10 and the second lead winding coil 15 are both wound by a wire and are of an integral structure, therefore, the inlet end 13 of the phase winding is protrudingly arranged on the axial upper side of the first lead winding coil 10, and the outlet end 14 of the phase winding is protrudingly arranged on the axial lower side of the second lead winding coil 15. The inlet end 13 and the outlet end 14 of the phase winding are arranged along the radial direction of the stator core 2, the inlet end 13 of the phase winding is connected with the coil inlet end 106 of the first lead winding coil 10, and the outlet end 14 of the phase winding is connected with the coil outlet end 107 of the second lead winding coil 15.

[0042] The coil inlet end 106 and the coil outlet end 107 of the first lead winding coil 10 are arranged along the radial direction of the stator core 2, the coil inlet end 106 and the coil outlet end 107 of the first lead winding coil 10 are arranged in the same slot of the stator core 2, and the coil inlet end 106 of the first lead winding coil 10 extends in the opposite direction along the radial direction of the stator core 2 compared with the coil outlet end 107, the coil inlet end 106 of the first lead winding coil 10 extends away from the axis of the stator core 2 and is located on the radial outer side of the stator core 2 so as to be connected with the inlet end 13 of the phase winding, and the coil outlet end 107 of the first lead winding coil 10 extends towards the axis of the stator core 2 and is located on the radial inner side of the stator core 2 so as to be connected with the connection winding coil 11 through the connection cross-over wire 12. When the first lead winding coil 10 is wound, a plurality of turns are wound in sequence along the circumferential direction of the tooth in the downward direction along the axial direction, and the coil inlet end 106 and the coil outlet end 107 of the first lead winding coil 10 are respectively located on the upper side and the lower side in the axial direction of the first lead winding coil 10.

[0043] The coil inlet end 106 and the coil outlet end 107 of the second lead winding coil 15 are arranged along the radial direction of the stator core 2, the coil inlet end 106 and the coil outlet end 107 of the second lead winding coil 15 are arranged in the same slot of the stator core 2, and the coil inlet end 106 of the second lead winding coil 15 extends in the opposite direction along the radial direction of the stator core 2 compared with the coil outlet end 107, the coil outlet end 107 of the second lead winding coil 15 extends away from the axis of the stator core 2 and is located on the radial outer side of the stator core 2 so as to be connected with the outlet end 14 of the phase winding, and the coil inlet end 106 of the second lead winding coil 15 extends towards the axis of the stator core 2 and is located on the radial inner side of the stator core 2 so as to be connected with the connection winding coil 11 through the connection cross-over wire 12. When the second lead winding coil 15 is wound, a plurality of turns are wound in sequence along the circumferential direction of the tooth in the downward direction along the axial direction, and the coil inlet end 106 and the coil outlet end 107 of the second lead winding coil 15 are respectively located on the upper side and the lower side in the axial direction of the second lead winding coil 10. The coil inlet end 106 of the first lead winding coil 10 and the coil inlet end 106 of the second lead winding coil 15 are located in different slots, and the coil inlet end 106 of the first lead winding coil 10 and the coil inlet end 106 of the second lead winding coil 15 are arranged in the slots on the two sides of the same tooth of the stator core 2.

[0044] In terms of structure, the connection winding coil 11, the first lead winding coil 10, and the second lead winding coil 15 each include a coil body. The height of the coil body of the first lead winding coil 10 and the height of the coil body of the second lead winding coil 15 are each less than the height of the coil body of the connection winding coil 11, so that the height (axial direction) of the winding coil 10 formed by the first lead winding coil 10 and the second lead winding coil 15 is consistent with the height (axial direction) of the connection winding coil 11.

[0045] For the connection winding coil 11, a coil wire inlet end 106 and a coil wire outlet end 107 are respectively provided on the axial direction of the connection winding coil 11 on both sides of the coil body. The coil wire inlet end 106 is connected to the coil wire outlet end 107 of one connection winding coil 11 or first lead winding coil 10 through a connection cross-over 12, and the coil wire outlet end 107 is connected to the coil wire outlet end 107 of another connection winding coil 11 or second lead winding coil 15 through a connection cross-over 12.

[0046] The coil body described above has a ring shape that is adapted to the shape of the teeth of the stator core 2, and is fitted on one tooth of the stator core 2. The coil body includes an inner turn 108, a first straight portion 104 and a second straight portion 105 respectively connected to both ends of the inner turn 108, and an outer turn 103 connected to both the first straight portion 104 and the second straight portion 105. When the coil body is fitted on the tooth of the stator core 2, the inner turn 108 is located on the radially inner side close to the axis of the stator core 2, the inner turn 108 corresponds to the radially inner side of the tooth of the stator core 2, the outer turn 103 is located on the radially outer side away from the axis of the stator core 2, the outer turn 103 corresponds to the radially outer side of the tooth of the stator core 2, the first straight portion 104 and the second straight portion 105 are respectively provided in the slots on both sides of one tooth of the stator core 2, both ends of the first straight portion 104 are fixedly connected to a corresponding set of ends of the inner turn 108 and the outer turn 103, and both ends of the second straight portion 105 are fixedly connected to another corresponding set of ends of the inner turn 108 and the outer turn 103, thereby forming the overall structure of the coil body in a ring shape. For the connection winding coil 11, the coil wire inlet end 106 and the coil wire outlet end 107 are respectively connected to the first straight portion 104 and the second straight portion 105, for the first lead winding coil 10, the coil wire inlet end 106 and the coil wire outlet end 107 are both connected to the first straight portion 104 or the second straight portion 105, and for the second lead winding coil 15, the coil wire inlet end 106 and the coil wire outlet end 107 are both connected to the second straight portion 105 or the first straight portion 104.

[0047] The first straight portion 104 and the second straight portion 105 each include a plurality of conductive wires, and the shape of the conductive wires constituting the first straight portion 104 and the second straight portion 105 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 104 and the structure of the second straight portion 105, so that the first straight portion 104 and the second straight portion 105 can be arranged in the slot of the stator core 2.

[0048] The outer turning portion 103 and the inner turning portion 108 each also include a plurality of conductive wires. The shape of the conductive wires constituting the outer turning portion 103 and the inner turning portion 108 is arc-shaped, and according to the shape of the teeth of the stator core 2, the shape of the conductive wires of the inner turning portion 108 is preferably semicircular or inferior arc-shaped. The conductive wires of the outer turning portion 103 include a linear segment and an arc-shaped segment arranged at both ends of the linear segment. The linear segment is fixedly connected with the arc-shaped segment, and the arc-shaped segment serves as a transition to facilitate the connection of the two ends of the linear segment with the corresponding conductive wires in the first straight portion 104 and the second straight portion 105, respectively. The shape of the arc-shaped segment 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 103, the first straight portion 104, and the second straight portion 105 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 103 and the inner turning portion 108 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 103 and the structure of the inner turning portion 108.

[0049] Any wire of the first straight part 104 is fixedly connected with the corresponding wire of the inner side turning part 108 and the outer side turning part 103 respectively, and any wire of the second straight part 105 is fixedly connected with the corresponding wire of the side turning part and the outer side turning part 103 respectively. The fixed connection mode of the first straight part 104 with the outer side turning part 103 and the inner side turning part 108 is preferably one-piece forming, and the fixed connection mode of the second straight part 105 with the outer side turning part 103 and the inner side turning part 108 is preferably one-piece forming. Therefore, when the coil body is prepared, the coil body is sequentially wound by one wire along the circumferential direction of the teeth of the stator core 2 and along the axial direction of the stator core 2, that is, when the coil body is prepared, the wire is first wound for one turn along the circumferential direction of the teeth of the stator core 2, and then moved by one thickness of the wire along the axial direction of the stator core 2, and then wound for the second turn, and then moved by one thickness of the wire along the axial direction of the stator core 2, and then wound for the third turn, and so on. One wire is wound for turns along the circumferential direction of the teeth of the stator core 2 and moved along the axial direction of the stator core 2 in order to be wound for multiple turns, so as to form 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 106 and the coil wire outlet end 107 respectively.

[0050] In some implementable embodiments, the wire constituting the first lead winding coil 10, the wire constituting the second lead winding coil 15, and the wire constituting the connection winding coil 11 are all flat copper wires.

[0051] The connection winding coil 11, the first lead winding coil 10, and the second lead winding coil 15 are all wound for multiple turns by one wire along the axial direction of the teeth of the stator core 2, and are one-piece formed, that is, any phase winding is sequentially wound along the teeth in the circumferential direction of the stator core 2 by one wire according to the designed shape, and is one-piece formed.

[0052] 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 is arranged in parallel with the axis of the stator core 2.

[0053] The specific structure of any phase winding in the stator winding will be described below, taking a phase winding with five connection winding coils 11, one first lead winding coil 10, and one second lead winding coil 15 as an example for illustration.

[0054] In any phase winding, five connecting winding coils 11 and one first lead winding coil 10 are arranged sequentially along the circumferential direction of the stator core 2. The input end 13 of the phase winding is one end of the wire used to wind the phase winding. This end of the wire extends to the radially outer surface of the stator core 2. The wire is wound multiple turns along the axial downward direction of one tooth of the stator core 2 to form the first lead winding coil 10. Then, it extends from the slot where the input end 13 of the phase winding is located toward the radially inner direction of the stator core 2 and enters the slot where the first connecting winding coil 11 is located, serving as the coil input end 106 of the first connecting winding coil 11. It is wound multiple turns along the axial downward direction of the tooth of the stator core 2 where the first connecting winding coil 11 is located. It extends from another slot where the first connecting winding coil 11 is located toward the radially inner direction of the stator core 2 and enters the slot where the second connecting winding coil 11 is located. The slot where the first connecting winding coil 11 is located serves as the coil inlet 106 of the second connecting winding coil 11. The winding method of the first connecting winding coil 11 is repeated for the second connecting winding coil 11, and so on, for the third, fourth, and fifth connecting winding coils 11. The wire extends from the slot occupied by the fifth connecting winding coil 11 and enters a slot of the second lead winding coil 15, which is the slot where the output end 14 of the phase winding is located. Along the axial downward direction of the second lead winding coil 15, the wire is wound multiple turns along the circumferential direction of the teeth of the stator core 2, extending from the layer where the input end 13 of the phase winding is located, reaching the radial outer surface of the stator core 2. This end of the wire is the output end 14 of the phase winding, completing the winding of one phase winding. The winding method of the other phase windings is the same as that of this phase winding.

[0055] A type of stator, such as Figure 1 As shown, it includes a stator core 2 and a concentrated stator winding 1 as described above. The concentrated stator winding 1 is disposed on the stator core 2. The outer corner of the teeth of the stator core 2 is rounded. The outer corner of the teeth of the stator core 2 is rounded to form a rounded structure. The outer corner of the teeth of the stator core 2 is adapted to the arc segment of the winding coil so that the outer turning part 103 of the winding coil can fit against the radial outer surface of the teeth of the stator core 2.

[0056] An electric motor, comprising a stator as described above.

[0057] With the above technical scheme, in the concentrated stator winding, two adjacent winding coils in each phase winding are connected through a connecting cross wire, the connecting cross wire is arranged at 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, so that the outer diameter of the stator core can be increased, thereby improving the output torque and output power of the motor, and simplifying the process and reducing the production cost; the wire inlet end and the wire outlet end of each phase winding are arranged at the radial outer side of the stator winding, the wire inlet end and the wire outlet end of any phase winding are arranged on the same winding coil, and the wire inlet end and the wire outlet end of any phase winding are located at any layer between the axial two sides of the winding coil, so that the winding coil is convenient to wind; the outer corner of the tooth of the stator core is chamfered, so that the wire is close to the outer circle of the outer corner structure of the tooth when the winding coil is wound on the tooth of the stator core, 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 power density of the motor are further improved; the radial inner side of the tooth of the stator core is not chamfered, so that the electrical load at the place is not too high or saturated.

[0058] The above embodiments of the utility model are described in detail, but the content described can only be the preferred embodiments of the utility model, and cannot be considered as limiting the scope of the utility model. Any equivalent changes and improvements 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 a multiphase winding, any phase winding being wound by one wire, any phase winding comprising a plurality of winding coils arranged in series along a circumferential direction of a stator core, adjacent winding coils being connected by a connecting cross-over, characterized in that: The connection cross-over is arranged radially inside each phase winding, the incoming and outgoing ends of each phase winding are arranged on the same winding coil, and the incoming end and the outgoing end are arranged on any layer between the axial two sides of the winding coil.

2. Concentrated stator winding according to claim 1, characterized in that The incoming end and the outgoing end of each phase winding are arranged radially outside the phase winding.

3. The concentrated stator winding of claim 2, wherein: The connection cross-overs of all phase windings are arranged radially inside the stator core, and the incoming and outgoing ends of all phase windings are arranged radially outside the stator core.

4. Concentrated stator winding according to any of claims 1-3, characterized in that: The incoming end and the outgoing end of each phase winding are arranged on the middle layer between the axial two sides of the winding coil.

5. Concentrated stator winding according to any of claims 1-3, characterized in that: The winding coil of any phase winding includes a first lead winding coil, a plurality of connection winding coils, and a second lead winding coil connected in sequence, the first lead winding coil and the second lead winding coil are coaxially arranged, the first lead winding coil and the plurality of connection winding coils are sequentially arranged along the circumferential direction of the stator core, and the incoming end and the outgoing end of any phase winding are arranged on the first lead winding coil and the second lead winding coil respectively.

6. The concentrated stator winding of claim 4, wherein: The winding coil of any phase winding includes a first lead winding coil, a plurality of connection winding coils, and a second lead winding coil connected in sequence, the first lead winding coil and the second lead winding coil are coaxially arranged, the first lead winding coil and the plurality of connection winding coils are sequentially arranged along the circumferential direction of the stator core, and the incoming end and the outgoing end of any phase winding are arranged on the first lead winding coil and the second lead winding coil respectively.

7. The concentrated stator winding of claim 5, wherein: The axial layer number of the first lead winding coil and the axial layer number of the second lead winding coil are both less than the axial layer number of the connection winding coil, the total height of the first lead winding coil and the second lead winding coil is consistent with the height of the connection winding coil, and the coil incoming end of the first lead winding coil and the coil outgoing end of the second lead winding coil are arranged on the same axial layer.

8. The concentrated stator winding of claim 7, wherein: The coil incoming end and the coil outgoing end of the first lead winding coil are arranged along the radial direction of the stator core, and the coil incoming end and the coil outgoing end of the first lead winding coil are arranged in the same slot of the stator core, the coil incoming end and the coil outgoing end of the second lead winding coil are arranged along the radial direction of the stator core, and the coil incoming end and the coil outgoing end of the second lead winding coil are arranged in the same slot of the stator core, the coil incoming end of the first lead winding coil and the coil incoming end of the second lead winding coil are arranged in the slots on both sides of the same tooth of the stator core respectively.

9. The concentrated stator winding of claim 5, wherein: The connection winding coil, the first lead winding coil and the second lead winding coil each comprise a coil body, the coil body comprising an inner turn portion, a first straight portion and a second straight portion connected to both ends of the inner turn portion respectively, and an outer turn portion connected to the first straight portion and the second straight portion, the inner turn portion is arranged at the radially inner side of the stator core, the outer turn portion is arranged at the radially 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 slots on the circumferential two sides of the same tooth of the stator core respectively.

10. The concentrated stator winding of claim 5, wherein: The conductive wire constituting the first lead winding coil, the conductive wire constituting the second lead winding coil and the conductive wire constituting the connection winding coil are all flat copper wires.

11. Concentrated stator winding according to any of claims 6-10, characterized in that: The connection winding coil, the first lead winding coil and the second lead winding coil are integrally formed by winding a conductive wire along the axial direction of the teeth of the stator core for multiple turns.

12. The concentrated stator winding of claim 1, wherein: The axis of any phase winding is coaxially arranged with the axis of the stator core.

13. A stator characterized by: A stator comprising a stator core and the concentrated stator winding as claimed in any one of claims 1-12, the concentrated stator winding being arranged on the stator core, and the outer corner of the teeth of the stator core being a rounded corner structure.

14. An electric machine characterized by: A stator as claimed in claim 13.

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