CN114498994A

CN114498994A - Stator module and motor with field font square wire

Info

Publication number: CN114498994A
Application number: CN202210079808.8A
Authority: CN
Inventors: 卢芳友
Original assignee: Shanghai Yiweike Motor Technology Co ltd
Current assignee: Shanghai Yiweike Motor Technology Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-05-13

Abstract

The invention belongs to the technical field of flat wire motors, and particularly relates to a stator assembly with a field-shaped square wire and a motor. 2+ n layers of conductor layers are sequentially arranged in each stator slot along the radial direction of the stator iron core; wherein, two layers of lead layers close to the outer side of the stator core are double lead layers, and the rest n layers of lead layers are single lead layers; n is an odd number greater than or equal to 1. The stator core adopts a field-shaped lead arrangement mode, namely two lead layers close to the outer side of the stator core are arranged, and each layer is provided with two leads, so that the width ratio of the overlarge single-slot lead is effectively avoided, the turning radius required by lead forming is reduced, and the height of the end part of the axial winding of the motor is reduced. On the basis of the field-shaped lead arrangement mode, a specific winding connection path is arranged, so that circuit balance of all branches of the winding can be realized, and the performance of the motor can be ensured to reach an optimal state.

Description

Stator module and motor with field font square wire

Technical Field

The invention belongs to the technical field of flat wire motors, and particularly relates to a stator assembly with a field-shaped square wire and a motor.

Background

In order to improve the slot filling rate of the motor, more and more motor schemes select a square wire as a motor wire or a flat wire motor scheme. In order to further improve the space utilization rate of the motor, the design of unequal groove widths is provided. However, in the existing design schemes with unequal groove widths, the wire of the outer circular groove has the characteristic of overlarge width-to-width ratio. The forming difficulty of the wire with large width-to-width ratio is high, and the turning radius required by the wire twisting head is large, so that the space utilization advantage is lost due to overlarge size of the winding end; in addition, the flat wire motor equipment has high manufacturing cost, and the performance superiority can be exerted only by ensuring circuit balance among all branches, which puts higher requirements on the winding design with unequal slot widths.

Disclosure of Invention

In order to solve the problems, the invention provides a stator assembly with a field-shaped square wire, which comprises a stator core and a stator winding, wherein the stator core is provided with a plurality of stator slots; the stator core is provided with a plurality of stator slots, and the stator slots are sequentially arranged along the circumferential direction of the stator core and are in an annular array shape; the winding of the stator winding adopts a rectangular conductor;

2+ n layers of conductor layers are sequentially arranged in each stator slot along the radial direction of the stator iron core; wherein, two layers of lead layers close to the outer side of the stator core are double lead layers, and the rest n layers of lead layers are single lead layers; n is an odd number greater than or equal to 1;

the span mode of the stator winding at the hairpin end is as follows: one layer of the wires closest to the stator core adopts a long-distance and short-distance combined span mode, and the other layers of the wires only adopt a full-distance span mode; the connection mode at the hairpin end is as follows: the No. 1 wire is connected with the No. 3 wire in the other stator slot, and the No. 2 wire is connected with the No. 4 wire in the other stator slot; the wire a is connected with the wire a +1 in the other stator slot, and the wire 4+ n is connected with the wire 4+ n in the other stator slot;

the span mode of the stator winding at the welding end is as follows: only whole distance is adopted; the connection mode at the welding end is as follows: the No. 1 wire is connected with the No. 1 wire in the other stator slot, the No. 2 wire is welded with the No. 3 wire in the other stator slot, and the No. b wire is connected with the No. b +1 wire of the other stator slot;

wherein a is an odd number, and a is more than or equal to 1+4 and less than 4+ n; b is an even number, and b is more than or equal to 4 and less than 4+ n; n is the number of single conductor layers in each stator slot, 2+ n is the number of all conductor layers in each stator slot, and 4+ n is the number of all conductors in each stator slot.

Further, in the same stator slot, the width of the double conductor layer is larger than that of the single conductor layer.

Furthermore, two wires are arranged in the same double-wire layer and are sequentially arranged along the axial direction of the stator core; only one conducting wire is arranged on the single conducting wire layer.

Further, the calculation formula of the whole distance, the short distance and the long distance is as follows:

C1＝Z/P，

C2＝C1-1；

C3＝C1+1；

wherein, C1 is the integer numerical value, C2 is the short-distance numerical value, C3 is the long-distance numerical value, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding.

Furthermore, the stator winding is composed of a plurality of minimum balancing units, and each branch of each phase of winding is composed of a plurality of minimum balancing units which are connected in series and/or in parallel.

On the basis of the stator assembly, the invention further provides a motor.

The invention has the beneficial effects that:

1. the stator core adopts a field-shaped lead arrangement mode, namely two lead layers close to the outer side of the stator core are arranged, and each layer is provided with two leads, so that the width ratio of the overlarge single-slot lead is effectively avoided, the turning radius required by lead forming is reduced, and the height of the end part of the axial winding of the motor is reduced.

2. On the basis of the field-shaped lead arrangement mode, a specific winding connection path is arranged, so that circuit balance of all branches of the winding can be realized, and the performance of the motor can be ensured to reach an optimal state.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a stator slot with a field-shaped square wire disposed therein according to an embodiment of the present invention;

FIG. 2 shows a schematic of the conductors within one phase pole of an embodiment of the present invention;

FIG. 3 is a diagram illustrating a first connection path of a minimum equalization unit A1 according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a first connection path of a minimum equalization unit a2 according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a second connection path of a minimum equalization unit A1 according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating a second connection path of a minimum equalization unit A2 according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating the number and connection manner of minimum equalization units a1 and a1 corresponding to different branches according to an embodiment of the present invention;

fig. 8 shows a U-phase winding wiring diagram of a 48-slot 8-stage stator assembly when the outgoing wires of the embodiment of the present invention are outgoing at the welding end;

fig. 9 shows a U-phase winding wiring diagram of a 48-slot 8-stage stator assembly when the outgoing line of the embodiment of the present invention is outgoing from the card issuing end;

FIG. 10 illustrates a structural schematic view of a stator assembly hairpin end of an embodiment of the invention;

fig. 11 shows a structural schematic diagram of a stator assembly weld end of an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a motor with a field-shaped square lead, which comprises a stator assembly. The stator assembly comprises a stator core and a stator winding; the stator core is generally cylindrical in shape to facilitate receipt of the motor rotor assembly within the stator core. The stator core is provided with a plurality of stator slots, and the stator slots are sequentially arranged along the circumferential direction of the stator core and are in an annular array shape. The winding of the stator winding adopts a rectangular conductor, and the winding is uniformly and symmetrically arranged in the stator slot.

Specifically, the stator winding can be divided into an in-slot winding and an end winding; the in-slot winding refers to a part of the rectangular conductor in the stator slot, and the end winding refers to a part of the rectangular conductor on two sides of the stator core. The end windings are used for connecting rectangular conductors at different positions in different stator slots in a matched mode according to a certain span, and therefore internal connection of the stator windings is achieved. The end windings are distributed on two sides of the stator core and are respectively called a hairpin end and a welding end.

Furthermore, 2+ n layers of conductor layers are sequentially arranged in each stator slot along the radial direction of the stator core; the stator comprises two layers of lead layers close to the outer side of a stator core, wherein two leads are arranged in each layer and are marked as double lead layers; two wires in the same double-wire layer are sequentially arranged along the axial direction of the stator core; the other wire layers are only provided with one wire and are marked as single wire layers; n is an odd number greater than or equal to 1.

Preferably, the width of the double conductor layer is greater than that of the single conductor layer. The width refers to the length of the conductor layer along the circumferential direction of the stator core. Set up field font wire mode of arranging, be close to the two-layer wire layer in the stator core outside soon, be provided with two wires in every layer, effectively avoided too big single groove wire width ratio, required turning radius when having reduced the wire shaping has reduced motor axial winding tip height.

Furthermore, the path of the winding on the stator core is determined by the span mode in the circumferential direction of the stator core and the connection mode in the radial direction of the stator core. Namely, different layer slot matching modes correspond to different winding paths.

Specifically, the stator core circumferential span pattern includes: a span mode at the hairpin end and a span mode at the weld end.

As shown in fig. 3 to 6, the span mode at the hairpin end is: and one layer of the wires closest to the inner circle side of the stator core adopts a long-distance and short-distance combined span mode, and the other layers of the wires only adopt a full-distance span mode. The integer pitch is determined by the number of stator slots and the number of poles, specifically, C1 is Z/P, wherein C1 is the integer pitch value, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding.

Further, the short distance is one less than the whole distance, namely, the short distance C2 is C1-1; the long distance is one greater than the whole distance, namely the long distance C3 is C1+ 1;

the span mode at the welding end is as follows: the span is only a full span, i.e., the span at the weld end is a full span C1.

Specifically, the connection manner in the radial direction of the stator core includes: the connection mode at the hairpin end and the connection mode at the weld end.

For convenience of explanation, the conductors in each stator slot are numbered. As shown in fig. 1, two wires in the double wire layers closest to the outer circle side of the stator core are defined as No. 1 wire and No. 2 wire; two wires in the other double-wire layer are defined as a No. 3 wire and a No. 4 wire; and the wires in all the other single wire layers are sequentially defined as No. 4+1 wires, No. 4+2 wires and No. 4+ n wires along the lateral inner circle side of the outer circle of the stator core. Wherein n is an odd number greater than or equal to 1.

In addition, when naming two wires in each double wire layer, the directions according to which the two wires are named may be the same, and the directions are not limited herein, and as shown in fig. 1, the two wires may be named in sequence from the left side to the right side of the direction shown in the drawing, or may be named in sequence from the right side to the right side, and there is no difference.

Specifically, the connection mode at the hairpin end is as follows: the No. 1 wire is connected with the No. 3 wire in the other stator slot, and the No. 2 wire is connected with the No. 4 wire in the other stator slot; the wire a is connected with the wire a +1 in the other stator slot, and the wire 4+ n is connected with the wire 4+ n in the other stator slot. Wherein a is an odd number, and a is more than or equal to 1+4 and less than 4+ n; n is the number of single conductor layers in each stator slot, 2+ n is the number of all conductor layers in each stator slot, and 4+ n is the number of all conductors in each stator slot.

The connection mode at the welding end is as follows: the No. 1 wire is connected with the No. 1 wire in the other stator slot, the No. 2 wire is welded with the No. 3 wire in the other stator slot, and the No. b wire is connected with the No. b +1 wire of the other stator slot. Wherein b is an even number, and b is more than or equal to 4 and less than 4+ n; n is the number of single conductor layers in each stator slot, 2+ n is the number of all conductor layers in each stator slot, and 4+ n is the number of all conductors in each stator slot.

The paths are arranged according to the span and layer connection mode, so that the stator winding is composed of a plurality of minimum balancing units, and each branch of each phase of winding is composed of a plurality of minimum balancing units in series connection and/or parallel connection, and the whole stator winding can be ensured to reach a circuit balancing state.

For example, a 48-slot 3-phase 8-pole winding is taken as an example, that is, the number Z of stator slots in the stator core is 48, the number P of stator windings is 8, and the number m of stator windings is 3. Therefore, the number of slots per pole per phase is Q ═ Z/(P ═ m) ═ 2, and the integer distance C1 is Z/P ═ 6.

Two stator slots located in the same stage under the same phase winding are defined as one phase pole, and two stator slots in the same phase pole are respectively defined as a pole position Q1 and a pole position Q2. As shown in fig. 2, 4+ n wires are disposed in each of the pole Q1 and the pole Q2.

For convenience of understanding, the stator slots and the conductors in the stator slots are named sequentially along the circumferential direction of the stator core. Illustratively, Z1(1) represents the conductor No. 1 for slot No. 1, and Z2(3) represents the conductor No. 3 for slot No. 2.

The stator winding is a three-phase winding, and is respectively an W, V, U-phase winding, each phase winding comprises one or more branches, and each branch is formed by connecting a plurality of minimum balancing units in series and/or in parallel.

Specifically, the minimum equalizing unit is divided into two routing paths, which are respectively marked as a minimum equalizing unit a1 and a minimum equalizing unit a 2.

Illustratively, when the lead wires are out at the bonding terminal, as shown in fig. 3, the winding path of the minimum equalization unit a1 is: z1(1) → Z7(3) → Z1(2) → Z7(4) → Z1(4+1) → Z7(4+2) → … → Z1(4+ n) → Z8(4+ n) → Z14(4+ n-1) → Z8(4+ n-2) → … → Z8(4+1) → Z14(4) → Z8(2) → Z14(3) → Z8 (1). The winding path of the minimum equalizing unit a1 passes through the conductors in the slots, and all the layers of conductors in the slots just cover all the layers of conductors in two stator slots.

For example, as shown in fig. 3, the intra-slot conducting wire passing through the slot No. 1 and the intra-slot conducting wire passing through the slot No. 7 in the minimum equalizing unit a1 both belong to the pole position Q1 in the same phase pole, and the combined intra-slot conducting wires passing through the two slots are equivalent to a stator slot full of conducting wires; the intra-slot conducting wire passing through the No. 8 slot and the intra-slot conducting wire passing through the No. 14 slot in the minimum equalization unit A1 both belong to the pole position Q2 in the same phase pole, and after the intra-slot conducting wires passing through the two slots are combined, the combined conducting wire is equivalent to a stator slot full of conducting wires. Therefore, the minimum equalization unit a1 can achieve local circuit equalization.

As shown in fig. 4, the winding path of the minimum equalization unit a2 is: z2(1) → Z8(3) → Z2(2) → Z8(4) → Z2(4+1) → Z8(4+2) → … → Z2(4+ n) → Z7(4+ n) → Z13(4+ n-1) → Z7(4+ n-2) → … → Z7(4+1) → Z13(4) → Z7(2) → Z13(3) → Z7 (1). The winding path of the minimum equalizing unit a2 passes through the conductors in the slots, and all the conductors in the slots are in a layer which just covers all the conductors in two stator slots.

For example, as shown in fig. 4, the intra-slot conducting wire passing through No. 2 slot and the intra-slot conducting wire passing through No. 8 slot in the minimum equalization unit a2 both belong to the pole position Q1 in the same phase pole, and the combined intra-slot conducting wires passing through the two slots correspond to a stator slot full of conducting wires; the in-slot conductor passing through the No. 7 slot and the in-slot conductor passing through the No. 13 slot in the minimum equalization unit A2 both belong to the pole position Q2 in the same phase pole, and the in-slot conductors passing through the two slots are combined to be equivalent to a stator slot full of conductors. Therefore, the minimum equalization unit a2 can achieve local circuit equalization.

The same phase winding comprises a plurality of branches, and each branch is formed by connecting a plurality of minimum equalizing units A1 and a plurality of minimum equalizing units A2 in series and/or in parallel. By adopting the stator winding wire connection path mode, the number of the minimum equalization units A1 and the number of the minimum equalization units A2 contained in each branch in the same phase winding are the same, so that circuit equalization can be realized in each branch in the same phase winding.

For example, when the outgoing line is outgoing at the card issuing end, as shown in fig. 5, the winding path of the minimum equalization unit a1 is: z7(3) → Z1(2) → Z7(4) → Z1(4+1) → Z7(4+2) → … → Z1(4+ n) → Z8(4+ n) → Z14(4+ n-1) → Z8(4+ n-2) → … → Z8(4+1) → Z14(4) → Z8(2) → Z14(3) → Z8(1) → Z14 (1). The in-slot conductor through which the winding path of the minimum equalization unit a1 passes corresponds to all conductor positions in two pole positions under one phase pole, and therefore, local circuit equalization is achieved.

As shown in fig. 6, the winding path of the minimum equalization unit a2 is: z8(3) → Z2(2) → Z8(4) → Z2(4+1) → Z8(4+2) → … → Z2(4+ n) → Z7(4+ n) → Z13(4+ n-1) → Z7(4+ n-2) → … → Z7(4+1) → Z13(4) → Z7(2) → Z13(3) → Z7(1) → Z13 (1). The in-slot conductor through which the winding path of the minimum equalization unit a2 passes corresponds to all conductor positions in two pole positions under one phase pole, and therefore, local circuit equalization is achieved.

Therefore, the minimum equalizing unit a1 and the minimum equalizing unit a2 are formed by connecting wires at different slot layer positions in series, and are completely equalized under a pair of phase poles.

As shown in fig. 7, when the number of branches per phase of the stator winding is 1, each branch is composed of 4 minimum equalizing units a1 and a minimum equalizing unit a 2; when the number of branches of each phase of the winding is 2, each branch is composed of 2 minimum equalizing units A1 and 2 minimum equalizing units A2; when the number of branches of each phase of the winding is 4, each branch is composed of 1 minimum equalizing unit A1 and 1 minimum equalizing unit A2; when the number of branches of each phase of the winding is 8, each branch is composed of 1 minimum equalizing unit A1 or 1 minimum equalizing unit A2.

Illustratively, as shown in fig. 8, the stator assembly is a U-phase winding wiring diagram of a 48-slot 3-phase 8-stage stator assembly, the lead wires of the U-phase winding wiring diagram are led out at the welding end, the U-phase winding wiring diagram is composed of 2 branches, namely a U1 branch and a U2 branch, and the U1 branch and the U2 branch are respectively composed of 2 minimum equalizing units a1 and 2 minimum equalizing units a2 which are connected in series. The specific winding path is as follows:

the winding path of the branch U1 is as follows: z1(1) → Z7(3) → Z7(2) → Z7(4+1) → Z7(4+2) → Z7(4+ n) → Z7(4+ n-1) → Z7(4+ Z7) → Z7(2) → Z7(3) → Z7(1) → Z7(3) → Z7 (7) → Z7 (7) → Z7) → (7) → Z7 (7) → Z7) → (7) → Z7 (7) → Z7) → (7) → Z7) → (7) → Z7 (7) → Z7) → (7) → Z7 (7) → Z7) → (7) → Z7) → (7) → + 7) → (7) → Z7) → (7) → Z7 (7) → + 7) → Z7 (7) → (7) → Z7) → (7) → Z7 (7) → (7) → Z7 (7) → (7) → Z7 (7) → (7) → Z7 (7) → Z7) → (685 (2) → Z38(3) → Z32(1) → Z38(1) → Z44(3) → Z38(2) → Z44(4) → Z38(4+1) → Z44(4+2) → … → Z38(4+ n) → Z43(4+ n) → Z1(4+ n-1) → Z43(4+ n-2) → … → Z43(4+1) → Z1(4) → Z43(2) → Z1(3) → Z43 (1).

The winding path of the U2 branch is as follows: z2(1) → Z8(3) → Z2(2) → Z8(4+1) → Z8(4+2) → Z8(4+ n-1) → Z8(4+ n-2) → Z8(2) → Z8(3) → Z8(1) → Z8(3) → Z8 (8) → Z8 (8) → Z8) → (8) → + 8) → Z8) → (8) → Z8) → (8) → Z8) → (8) → Z8) → (8) → Z8) → (8) → Z8 (8) → Z8 (8) → + 8 (8) → Z8 (8) → (8) → Z8 (8) → Z8) → (8) → Z8 (8) → + 8) → (8) → Z8) → (8) → Z8 (8) → ( Z31(2) → Z37(3) → Z31(1) → Z37(1) → Z43(3) → Z37(2) → Z43(4) → Z37(4+1) → Z43(4+2) → … → Z37(4+ n) → Z44(4+ n) → Z2(4+ n-1) → Z442(4+ n-2) → … → Z44(4+1) → Z2(4) → Z44(2) → Z2(3) → Z44 (1).

It can be seen that the branches U1 and U2 are formed by connecting 2 minimum equalizing units a1 and 2 minimum equalizing units a2 in series, and are completely equalized under 8 poles.

Illustratively, as shown in fig. 9, the stator assembly is a U-phase winding wiring diagram of a 48-slot three-phase 8-level stator assembly, the lead wires of the U-phase winding wiring diagram are led out at the welding and hairpin end, the U-phase winding wiring is composed of 2 branches, which are divided into a U1 branch and a U2 branch, and the U1 branch and the U2 branch are each composed of 2 minimum equalizing units a1 and 2 minimum equalizing units a2 in series. The specific winding path is as follows:

the winding path of the U1 branch is as follows: z7(3) → Z1(2) → Z1(4+1) → Z1(4+ 2) → Z1(4) → 1 → Z1(4+ n) → Z1(4+ n) → n-1) → Z1(4+ n-2) → Z1 → 4 → Z1(4+1) → Z1(4) → Z1(1) → Z1(1) → Z1(1) → Z1(1) → Z1(1) → Z1(1) → Z1) → (1) → Z1(1) → +1) → (1) → Z1) → (1) → Z1) → (1) → Z1) → (1) → Z1(1) → Z1(1) → Z1(1) → Z1(1) → Z1) → +1) → Z1(1) → + 1(1) → Z1(1) → + 1(1) → Z1(1) → + 1(1) → Z1(1) → Z1(1) → Z1(1) → Z1(1) → + 1(1) → Z1) → +1) → (1 (3) → Z32(1) → Z38(1) → Z44(3) → Z38(2) → Z44(4) → Z38(4+1) → Z44(4+2) → … → Z38(4+ n) → Z43(4+ n) → Z1(4+ n-1) → Z43(4+ n-2) → … → Z43(4+1) → Z1(4) → Z43(2) → Z1(3) → Z43(1) → Z1 (1).

The winding path of the U2 branch is as follows: z8(3) → Z2(2) → Z8(4) → Z2(4+1) → Z2(4+ 2) → Z2(4) → Z2(2) → Z2(4+ n-1) → Z2(4+ n-2) → Z2 → 4(4+ Z2) → Z2(1) → Z2(2) → Z2(1) → Z2(2) → Z2(2) → Z2) → (2) → Z2) → (2) → Z2(2) → (2) → Z2) → (2) → Z2(2) → Z2) → (2) → Z2(2) → Z2(2) → Z2) → (2) → Z2(2) → (2) → + 2(2) → (2) → (2) → Z2) → (2) → Z2(2) → (2) → +2) → Z2(2) → Z2(2) → Z2) → ( Z37(3) → Z31(1) → Z37(1) → Z43(3) → Z37(2) → Z43(4) → Z37(4+1) → Z43(4+2) → … → Z37(4+ n) → Z44(4+ n) → Z2(4+ n-1) → Z442(4+ n-2) → … → Z44(4+1) → Z2(4) → Z44(2) → Z2(3) → Z44(1) → Z2 (1).

The V-phase winding and the W-phase winding in the stator winding are also symmetrically and uniformly distributed on the stator core by adopting the winding connection mode, and the illustration is omitted.

As shown in fig. 10, the number of hairpins corresponding to the layer of wires closest to the outside of the stator core is about 2 times the number Z of stator slots when viewed from the hairpin end; the number of hairpins corresponding to a layer of wires closest to the inner side of the stator core is about half of the number Z of stator slots, and the end processes of the U-shaped wire winding on the inner circle side are in a pairwise overlapping state; the number of hairpins corresponding to the wires of the other layers is equal to the number Z of the stator slots.

As shown in fig. 11, the number of the hairpin at the layer closest to the outside of the stator core is about 2 times the number Z of the stator slots as viewed from the welded end; the number of hairpins in the layer closest to the inner side of the stator core is about half of the number of stator slots Z, and the number of hairpins in the remaining layers is equal to the number of stator slots Z. In addition, all welding points on the same radius of the stator core are defined as a welding point column when viewed from the twisted head end. The number of welding point rows along the circumferential direction of the stator core is 2 times of the number Z of the stator slots. Wherein about half of the bonding point columns have wire direct bonding points with different width-to-width ratios. And the twisting direction of the end winding at the inner circle side is consistent when seen from the twisting head end, so that the cross interference of the inner layer welding end wire is effectively avoided, and the size of the end winding is further favorably controlled.

Illustratively, as shown in fig. 11, the three-phase lead-out wire or the central point is positioned at the outermost circle side or the innermost circle side, other wires are not needed to be used as crossovers at other positions, and the winding achieves a relatively simple connection mode, so that the manufacturing cost and the material cost are reduced. When the outgoing line is led out from the card sending end, the other characteristics are consistent with those of the outgoing line from the welding end except the outgoing line, and the details are not repeated here.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly with a Chinese character tian-shaped square lead is characterized by comprising a stator core and a stator winding; the stator core is provided with a plurality of stator slots, and the stator slots are sequentially arranged along the circumferential direction of the stator core and are in an annular array shape; the winding of the stator winding adopts a rectangular conductor;

the span mode of the stator winding at the hairpin end is as follows: one layer of wires closest to the stator core adopts a long-distance and short-distance combined span mode, and the other layers of wires only adopt a full-distance span mode; the connection mode at the hairpin end is as follows: the No. 1 wire is connected with the No. 3 wire in the other stator slot, and the No. 2 wire is connected with the No. 4 wire in the other stator slot; the wire a is connected with the wire a +1 in the other stator slot, and the wire 4+ n is connected with the wire 4+ n in the other stator slot;

the stator winding is in a span mode at the welding end as follows: only whole distance is adopted; the connection mode at the welding end is as follows: the No. 1 wire is connected with the No. 1 wire in the other stator slot, the No. 2 wire is welded with the No. 3 wire in the other stator slot, and the No. b wire is connected with the No. b +1 wire of the other stator slot;

2. The stator assembly of claim 1, wherein the width of the double layer of conductors is greater than the width of the single layer of conductors within the same stator slot.

3. The stator assembly with the field-shaped square wires according to claim 2, wherein two wires are arranged in the same double wire layer and are sequentially arranged along the axial direction of the stator core; only one conducting wire is arranged on the single conducting wire layer.

4. The stator assembly with the field-shaped square wires according to claim 1, wherein the calculation formula of the full-pitch, short-pitch and long-pitch is as follows:

C1＝Z/P，

C2＝C1-1；

C3＝C1+1；

5. The stator assembly with the field-shaped square wires is characterized in that the stator winding is composed of a plurality of minimum balancing units, and each branch of each phase winding is composed of a plurality of minimum balancing units which are connected in series and/or in parallel.

6. An electrical machine comprising a stator assembly according to any of claims 1-5.