A stator assembly and motor having small width-to-thickness ratio conductors

Abstract

The present application belongs to the technical field of flat wire motor, and particularly relates to a stator assembly with small width-to-thickness ratio wire and a motor. A plurality of stator slots are arranged on the stator core, and 3+n layers of wire layers are sequentially arranged in the radial direction of the stator core in each stator slot. The three layers of wire layers close to the outer side of the stator core are double wire layers, and the remaining n layers of wire layers are single wire layers. n is an odd number greater than or equal to 1. The present application adopts a 2+4+n wire arrangement mode, i.e. two wires are arranged in each of the three layers of wire layers close to the outer side of the stator core, which effectively avoids the excessively large width-to-thickness ratio of single-slot wire, reduces the required turning radius when the wire is formed, and reduces the height of the axial winding end of the motor.

Description

Technical Field

[0001] This invention belongs to the field of flat wire motor technology, and specifically relates to a stator assembly and motor with a conductor having a small width-to-narrowness ratio. Background Technology

[0002] To improve the slot fill factor of motors, an increasing number of motor designs are choosing square conductors or flat wire motors. To further improve space utilization, unequal slot width designs have been proposed. However, existing unequal slot width designs all suffer from excessively large width-to-narrowness ratios in the outer circular slots. High width-to-narrowness ratio conductors are difficult to form, and the large turning radius required for conductor twisting results in excessively large winding end dimensions, negating the space utilization advantage. This is especially true when the width difference between the outer and inner circular slots is significant, further complicating winding design and conductor forming.

[0003] In addition, flat wire motors have high manufacturing costs, and circuit balance must be ensured between each branch to maximize their performance. This places higher demands on the winding design with unequal slot widths. Summary of the Invention

[0004] To address the above problems, the present invention provides a stator assembly with conductors having a small aspect ratio, comprising a stator core and a stator winding; the stator core is provided with a plurality of stator slots, which are arranged sequentially along the circumference of the stator core in a circular array; the windings of the stator winding are made of rectangular conductors;

[0005] Each stator slot contains 3+n layers of conductors arranged radially along the stator core; among them, the three conductor layers closest to the outer side of the stator core are all double conductor layers, and the remaining n conductor layers are all single conductor layers; n is an odd number greater than or equal to 1.

[0006] The stator winding spacing at the starting end is as follows: the layer of conductors closest to the inner circle of the stator core uses a combination of long and short spacing, while the remaining layers of conductors use only full-spacing spacing; the connection method at the starting end is as follows: conductor 1 is connected to conductor 2 in another stator slot, conductor 3 is connected to conductor 6 in another stator slot, conductor 4 is connected to conductor 5 in another stator slot; conductor a is connected to conductor a+1 in another stator slot, and conductor 6+n is connected to conductor 6+n in another stator slot;

[0007] The stator winding has the following span at the welding end: only full pitch is used; the connection method at the welding end is as follows: wire 1 is connected to wire 4 in another stator slot, wire 2 is welded to wire 2 in another stator slot, wire 3 is welded to wire 5 in another stator slot, and wire b is connected to wire b+1 in another stator slot.

[0008] Where a is an odd number, and 6+1≤a<6+n; b is an even number, and 6≤b<6+n; n is the number of single conductor layers in each stator slot, 3+n is the number of all conductor layers in each stator slot, and 6+n is the number of conductors in each stator slot.

[0009] Furthermore, within the same stator slot, the width of the dual conductor layer is greater than the width of the single conductor layer.

[0010] Furthermore, the same double conductor layer has two conductors arranged sequentially along the axial direction of the stator core; the single conductor layer has only one conductor.

[0011] Furthermore, the height of a single conductor in the double conductor layer closest to the outer circle of the stator core is smaller than the height of a single conductor in the two adjacent double conductor layers in the radial direction of the stator core; and the width is larger than the width of a single conductor in the two adjacent double conductor layers in the radial direction of the stator core.

[0012] Furthermore, the calculation formulas for the full distance, short distance, and long distance are as follows:

[0013] C1 = Z / P,

[0014] C2 = C1-1;

[0015] C3 = C1 + 1;

[0016] Where C1 is the full pitch value, C2 is the short pitch value, C3 is the long pitch value, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding.

[0017] Furthermore, the stator winding is composed of several minimum balancing units, and each branch of each phase winding is composed of multiple minimum balancing units connected in series and / or in parallel.

[0018] The present invention also provides an electric motor including the stator assembly described above.

[0019] The beneficial effects of this invention are:

[0020] 1. The present invention adopts a 2+4+n wire arrangement method, that is, two wires are set in each of the three wire layers near the outside of the stator core. This effectively avoids an excessively large width-to-narrowness ratio of the single slot wire, reduces the turning radius required when forming the wire, and lowers the height of the motor axial winding end.

[0021] 2. In this invention, the height of the conductors in the first conductor layer is smaller than that in the second and third conductor layers, while the width is larger. This design is suitable for situations where the widths of the outer and inner circular grooves differ significantly; it allows for more efficient use of the tooth space, making the two sides of the teeth closer to and parallel; and the hairpin section of the first conductor layer can fully utilize the radial space, reducing the end height.

[0022] 3. Based on the 2+4+n wire arrangement, set specific winding connection paths to ensure that each branch of the winding can achieve circuit balance and ensure that the motor performance reaches the optimal state.

[0023] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This diagram illustrates a structure in which a square conductor is disposed within a stator slot according to an embodiment of the present invention.

[0026] Figure 2 A schematic diagram of a conductor within a phase pole according to an embodiment of the present invention is shown;

[0027] Figure 3 This diagram illustrates a first connection path for the minimum equalization unit A1 according to an embodiment of the present invention.

[0028] Figure 4 This diagram illustrates a first connection path for the minimum equalization unit A2 according to an embodiment of the present invention.

[0029] Figure 5 This diagram illustrates a second connection path for the minimum equalization unit A1 according to an embodiment of the present invention.

[0030] Figure 6 This diagram illustrates a second connection path for the minimum equalization unit A2 according to an embodiment of the present invention.

[0031] Figure 7 This diagram illustrates the number and connection method of the minimum equalization unit A1 and minimum equalization unit A2 corresponding to different branches in an embodiment of the present invention.

[0032] Figure 8 This diagram shows the U-phase winding wiring of a 48-slot 8-pole stator assembly when the lead wires exit at the welding end, according to an embodiment of the present invention.

[0033] Figure 9 This diagram shows the U-phase winding wiring of the 48-slot 8-pole stator assembly when the lead wires are exiting at the card-opening end, according to an embodiment of the present invention.

[0034] Figure 10 A schematic diagram of the stator assembly hairpin end according to an embodiment of the present invention is shown;

[0035] Figure 11 A schematic diagram of the stator assembly welding end according to an embodiment of the present invention is shown. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] This invention provides a motor with conductors having a small aspect ratio, the motor including a stator assembly. The stator assembly includes a stator core and stator windings; the stator core is generally cylindrical to accommodate a motor rotor assembly. The stator core has a plurality of stator slots arranged sequentially along the circumference of the stator core in a circular array. The stator windings use rectangular conductors, and the windings are uniformly and symmetrically arranged within the stator slots.

[0038] Specifically, the stator winding can be divided into slot windings and end windings; the slot winding refers to the portion of the rectangular conductor located within the stator slot, and the end winding refers to the portions of the rectangular conductor located on both sides of the stator core. The function of the end windings is to pair and connect rectangular conductors at different positions within different stator slots at a certain span, thereby achieving internal connection of the stator winding. The end windings are distributed on both sides of the stator core and are respectively referred to as the hairpin end and the weld end.

[0039] Furthermore, each stator slot has 3+n layers of conductors arranged radially along the stator core; among them, the three conductor layers closest to the outside of the stator core each have two conductors, and are called double conductor layers; and the two conductors in the same double conductor layer are arranged sequentially along the axial direction of the stator core; the remaining conductor layers each have only one conductor, and are called single conductor layers; n is an odd number greater than or equal to 1.

[0040] For example, such as Figure 1 As shown, the three conductor layers in the stator slot near the outer circle of the stator core are referred to as the first, second, and third conductor layers, and are all double conductor layers.

[0041] Furthermore, the width of the double conductor layer is greater than the width of the single conductor layer, with the double conductor layer closest to the outer circumference of the stator core being the widest. The width refers to the length of the conductor layer along the circumference of the stator core. By placing two conductors in each of the three conductor layers closest to the outer side of the stator core, an excessively large width-to-width ratio in a single slot is effectively avoided, reducing the turning radius required for conductor forming and lowering the height of the motor's axial winding end.

[0042] Preferably, the height of the conductor in the double-conductor layer closest to the outer circumference of the stator core is smaller than the height of the conductor in the two radially adjacent double-conductor layers of the stator core; and the width is larger than the width of the conductor in the two radially adjacent double-conductor layers of the stator core. For example... Figure 1 As shown, the height of a single conductor in the first layer is smaller than that of a single conductor in the second and third layers, while its width is larger. This design is suitable for situations where the widths of the outer and inner grooves differ significantly; it allows for more efficient use of the tooth space, making the two sides of the teeth closer to and parallel; and the hairpin section of the first layer of conductors can fully utilize the radial space, reducing the end height.

[0043] Furthermore, the path of the winding wires on the stator core is determined by both the circumferential span of the stator core and the radial connection method. That is, different layer-slot configurations correspond to different winding wire paths.

[0044] Specifically, the span method in the circumferential direction of the stator core includes: the span method at the hairpin end and the span method at the welding end.

[0045] like Figures 3-6 As shown, the span method at the issuing end is as follows: the layer of conductors closest to the inner circle of the stator core uses a combination of long and short spans, while the remaining layers of conductors use only a full-pitch span. The full pitch is determined by the number of stator slots and poles, specifically C1 = Z / P, where C1 is the full pitch value, Z is the number of stator slots on the stator core, and P is the number of poles in the stator winding.

[0046] Furthermore, the short distance is one less than the whole distance, i.e., the short distance C2 = C1 - 1; the long distance is one more than the whole distance, i.e., the long distance C3 = C1 + 1.

[0047] The span method at the welding end is as follows: only the whole span method is used, that is, the span at the welding end is always the whole span C1.

[0048] Specifically, the connection methods in the radial direction of the stator core include: the connection method at the hairpin end and the connection method at the welding end.

[0049] For ease of explanation, the conductors in each stator slot are numbered and named. For example... Figure 1 As shown, the two conductors in the first double-conductor layer are defined as conductor 1 and conductor 2; the two conductors in the second double-conductor layer are defined as conductor 3 and conductor 4; the two conductors in the third double-conductor layer are defined as conductor 5 and conductor 6; and all other single-conductor layers, along the outer circle to the inner circle of the stator core, are successively defined as conductor 6+1, conductor 6+2, ..., conductor 6+n. Here, n is an odd number greater than or equal to 1.

[0050] It should be noted that when naming the two conductors in each double-conductor layer, the direction used should be the same; there is no restriction on the direction here. Figure 1 As shown, the names can be ordered from left to right in the direction shown in the diagram, or from right to right; there is no difference.

[0051] The connection method at the card issuing end is as follows: wire 1 is connected to wire 2 in another stator slot, wire 3 is connected to wire 6 in another stator slot, wire 4 is connected to wire 5 in another stator slot; wire a is connected to wire a+1 in another stator slot, and wire 6+n is connected to wire 6+n in another stator slot. Where a is an odd number, and 6+1≤a<6+n; n is the number of single wire layers in each stator slot, 3+n is the total number of wire layers in each stator slot, and 6+n is the total number of wires in each stator slot.

[0052] The connection method at the welding end is as follows: wire 1 is connected to wire 4 in another stator slot; wire 2 is welded to wire 2 in another stator slot; wire 3 is welded to wire 5 in another stator slot; and wire b is connected to wire b+1 in another stator slot. Where b is an even number, and 6 ≤ b < 6 + n; n is the number of single wire layers in each stator slot; 3 + n is the total number of wire layers in each stator slot; and 6 + n is the total number of wires in each stator slot.

[0053] By setting the path according to the above-mentioned span and layer connection method, the stator winding is composed of several minimum balancing units, and each branch of each phase winding is composed of multiple minimum balancing units connected in series and / or in parallel. Therefore, it can be ensured that the stator winding as a whole achieves a circuit balance state.

[0054] For example, let's take a 48-slot, 3-phase, 8-pole winding as an example. That is, the number of stator slots on the stator core Z = 48, the number of poles of the stator winding P = 8, and the number of phases of the stator winding m = 3. Therefore, the number of slots per pole per phase is Q = Z / (P*m) = 2, and the pitch C1 = Z / P = 6.

[0055] Two stator slots in the same phase winding and within the same stage are defined as one phase pole, and two stator slots within the same phase pole are defined as pole positions Q1 and Q2, respectively. For example... Figure 2 As shown, both extreme positions Q1 and Q2 are equipped with 6+n wires.

[0056] For ease of understanding, each stator slot and the conductor within each stator slot are named sequentially along the circumference of the stator core. For example, Z1(1) represents conductor number 1 in slot 1, and Z2(3) represents conductor number 3 in slot 2.

[0057] The stator winding is a three-phase winding, namely W, V and U phase windings. Each phase winding includes one or more branches, and each branch is composed of multiple minimum balancing units connected in series and / or in parallel.

[0058] Specifically, the minimum equalization unit is divided into two winding paths, denoted as minimum equalization unit A1 and minimum equalization unit A2, respectively.

[0059] For example, when the lead wire exits at the soldering end, such as Figure 3 As shown, the winding path of the minimum equalization unit A1 is: Z1(2)→Z7(1)→Z1(4)→Z7(5)→Z1(3)→Z7(6)→Z1(6+1)→Z7(6+2)→…→Z1(6+n)→Z8(6+n)→Z14(6+n-1)→Z8(6+n-2)→…→Z8(6+1)→Z14(6)→Z8(3)→Z14(5)→Z8(4)→Z14(1)→Z8(2). The winding path of the minimum equalization unit A1 passes through slot conductors, and the layers containing all slot conductors exactly cover all conductor layers in the two stator slots. For example, as Figure 3As shown, in the minimum equalization unit A1, the wires passing through slot 1 and slot 7 both belong to the same phase pole at position Q1. Combining the wires passing through these two slots is equivalent to creating a stator slot filled with wires. Similarly, in the minimum equalization unit A2, the wires passing through slot 8 and slot 14 both belong to the same phase pole at position Q2. Combining the wires passing through these two slots is equivalent to creating a stator slot filled with wires. Therefore, the minimum equalization unit can achieve local circuit equalization.

[0060] like Figure 4 As shown, the winding path of the minimum equalization unit A2 is: Z2(2)→Z8(1)→Z2(4)→Z8(5)→Z2(3)→Z8(6)→Z2(6+1)→Z8(6+2)→…→Z2(6+n)→Z7(6+n)→Z13(6+n-1)→Z7(6+n-2)→…→Z7(6+1)→Z13(6)→Z7(3)→Z13(5)→Z7(4)→Z13(1)→Z7(2). The winding path of the minimum equalization unit A2 passes through slot conductors, and the layer containing all slot conductors just covers all conductors in two stator slots. For example, as Figure 4 As shown, in the minimum equalization unit A2, the wires passing through slot 2 and slot 8 both belong to the same phase pole at position Q1. Combining the wires passing through these two slots is equivalent to creating a stator slot filled with wires. Similarly, in the minimum equalization unit A2, the wires passing through slot 7 and slot 13 both belong to the same phase pole at position Q2. Combining the wires passing through these two slots is equivalent to creating a stator slot filled with wires. Therefore, the minimum equalization unit can achieve local circuit equalization.

[0061] Each phase winding includes multiple branches, each branch consisting of multiple minimum balancing units A1 and multiple minimum balancing units A2 connected in series and / or in parallel. By adopting the above-mentioned stator winding connection path method, the number of minimum balancing units A1 and A2 in each branch of the same phase winding is the same, thus enabling circuit balancing in each branch of the same phase winding.

[0062] For example, when the lead wire exits at the card issuing end, such as Figure 5As shown, the winding path of the minimum equalization unit A1 is: Z7(1)→Z1(4)→Z7(5)→Z1(3)→Z7(6)→Z1(6+1)→Z7(6+2)→…→Z1(6+n)→Z8(6+n)→Z14(6+n-1)→Z8(6+n-2)→…→Z8(6+1)→Z14(6)→Z8(3)→Z14(5)→Z8(4)→Z14(1)→Z8(2)→Z14(2). The wires in the slots through which the winding path of the minimum equalization unit A1 passes correspond to the positions of all wires in the two poles under one phase pole, thus achieving local circuit equalization.

[0063] like Figure 6 As shown, the winding path of the minimum equalization unit A2 is: Z8(1)→Z2(4)→Z8(5)→Z2(3)→Z8(6)→Z2(6+1)→Z8(6+2)→…→Z2(6+n)→Z7(6+n)→Z13(6+n-1)→Z7(6+n-2)→…→Z7(6+1)→Z13(6)→Z7(3)→Z13(5)→Z7(4)→Z13(1)→Z7(2)→Z13(2). The wires in the slots through which the winding path of the minimum equalization unit A2 passes correspond to the positions of all wires in the two poles under one phase pole, thus achieving local circuit equalization.

[0064] Therefore, both the minimum equalization unit A1 and the minimum equalization unit A2 are composed of wires connected in series at different slot positions, and are completely equalized under a pair of phase poles.

[0065] like Figure 7 As shown, when the number of branches per phase of the stator winding is 1, each branch consists of 4 minimum balancing units A1 and A2; when the number of branches per phase of the winding is 2, each branch consists of 2 minimum balancing units A1 and 2 minimum balancing units A2; when the number of branches per phase of the winding is 4, each branch consists of 1 minimum balancing unit A1 and 1 minimum balancing unit A2; when the number of branches per phase of the winding is 8, each branch consists of 1 minimum balancing unit A1 or 1 minimum balancing unit A2.

[0066] For example, such as Figure 8 The diagram shows the wiring diagram of the U-phase winding of a 48-slot, 3-phase, 8-stage stator assembly. The leads exit at the welding terminals. The U-phase winding consists of two branches, U1 and U2. Both branches are composed of two minimum balancing units A1 and A2 connected in series. The specific winding path is as follows:

[0067] The loop path of branch U1 is: Z1(2)→Z7(1)→Z1(4)→Z7(5)→Z1(3)→Z7(6)→Z1(6+1)→Z7(6+2)→…→Z1(6+n)→Z8(6+n)→Z14(6+n-1)→Z8(6+n-2)→…→Z8(6+1)→Z14(6)→Z8(3)→Z14(5)→Z8(4)→Z14(1)→Z8(2)→Z1 4(2)→Z20(1)→Z14(4)→Z20(5)→Z14(3)→Z20(6)→Z14(6+1)→Z20(6+2)→…→Z14(6+n)→Z19(6+n )→Z25(6+n-1)→Z19(6+n-2)→…→Z19(6+1)→Z25(6)→Z19(3)→Z25(5)→Z19(4)→Z25(1)→Z19(2)→ Z25(2)→Z31(1)→Z25(4)→Z31(5)→Z25(3)→Z31(6)→Z25(6+1)→Z31(6+2)→…→Z25(6+n)→Z32(6 +n)→Z38(6+n-1)→Z32(6+n-2)→…→Z32(6+1)→Z38(6)→Z32(3)→Z38(5)→Z32(4)→Z38(1)→Z32(2 )→Z38(2)→Z44(1)→Z38(4)→Z44(5)→Z38(3)→Z44(6)→Z38(6+1)→Z44(6+2)→…→Z38(6+n)→Z43 (6+n)→Z1(6+n-1)→Z43(6+n-2)→…→Z43(6+1)→Z1(6)→Z43(3)→Z1(5)→Z43(4)→Z1(1)→Z43(2).

[0068] The loop path of branch U2 is: Z2(2)→Z8(1)→Z2(4)→Z8(5)→Z2(3)→Z8(6)→Z2(6+1)→Z8(6+2)→…→Z2(6+n)→Z7(6+n)→Z13(6+n-1)→Z7(6+n-2)→…→Z7(6+1)→Z13(6)→Z7(3)→Z13(5)→Z7(4)→Z13(1)→Z7(2)→Z1 3(2)→Z19(1)→Z13(4)→Z19(5)→Z13(3)→Z19(6)→Z13(6+1)→Z19(6+2)→…→Z13(6+n)→Z20(6+n )→Z26(6+n-1)→Z20(6+n-2)→…→Z20(6+1)→Z26(6)→Z20(3)→Z26(5)→Z20(4)→Z26(1)→Z20(2)→ Z26(2)→Z32(1)→Z26(4)→Z32(5)→Z26(3)→Z32(6)→Z26(6+1)→Z32(6+2)→…→Z26(6+n)→Z31(6 +n)→Z37(6+n-1)→Z31(6+n-2)→…→Z31(6+1)→Z37(6)→Z31(3)→Z37(5)→Z31(4)→Z37(1)→Z31(2 )→Z37(2)→Z43(1)→Z37(4)→Z43(5)→Z37(3)→Z43(6)→Z37(6+1)→Z43(6+2)→…→Z37(6+n)→Z44 (6+n)→Z2(6+n-1)→Z44(6+n-2)→…→Z44(6+1)→Z2(6)→Z44(3)→Z2(5)→Z44(4)→Z2(1)→Z44(2).

[0069] It can be seen that both U1 and U2 branches are composed of two minimum equalization units A1 and two minimum equalization units A2 connected in series, and are completely equalized under 8 poles.

[0070] For example, such as Figure 9 The diagram shows the wiring diagram of the U-phase winding of a 48-slot three-phase 8-stage stator assembly. The leads exit at the hairpin terminals. The U-phase winding consists of two branches, U1 and U2. Both branches are composed of two minimum balancing units A1 and A2 connected in series. The specific winding path is as follows:

[0071] The loop path of branch U1 is: Z7(1)→Z1(4)→Z7(5)→Z1(3)→Z7(6)→Z1(6+1)→Z7(6+2)→…→Z1(6+n)→Z8(6+n)→Z14(6+n-1)→Z8(6+n-2)→…→Z8(6+1)→Z14(6)→Z8(3)→Z14(5)→Z8(4)→Z14(1)→Z8(2)→Z14(2)→Z 20(1)→Z14(4)→Z20(5)→Z14(3)→Z20(6)→Z14(6+1)→Z20(6+2)→…→Z14(6+n)→Z19(6+n)→Z25( 6+n-1)→Z19(6+n-2)→…→Z19(6+1)→Z25(6)→Z19(3)→Z25(5)→Z19(4)→Z25(1)→Z19(2)→Z25(2) →Z31(1)→Z25(4)→Z31(5)→Z25(3)→Z31(6)→Z25(6+1)→Z31(6+2)→…→Z25(6+n)→Z32(6+n)→Z3 8(6+n-1)→Z32(6+n-2)→…→Z32(6+1)→Z38(6)→Z32(3)→Z38(5)→Z32(4)→Z38(1)→Z32(2)→Z38( 2)→Z44(1)→Z38(4)→Z44(5)→Z38(3)→Z44(6)→Z38(6+1)→Z44(6+2)→…→Z38(6+n)→Z43(6+n)→ Z1(6+n-1)→Z43(6+n-2)→…→Z43(6+1)→Z1(6)→Z43(3)→Z1(5)→Z43(4)→Z1(1)→Z43(2)→Z1(2).

[0072] The loop path of branch U2 is: Z8(1)→Z2(4)→Z8(5)→Z2(3)→Z8(6)→Z2(6+1)→Z8(6+2)→…→Z2(6+n)→Z7(6+n)→Z13(6+n-1)→Z7(6+n-2)→…→Z7(6+1)→Z13(6)→Z7(3)→Z13(5)→Z7(4)→Z13(1)→Z7(2)→Z13(2)→Z 19(1)→Z13(4)→Z19(5)→Z13(3)→Z19(6)→Z13(6+1)→Z19(6+2)→…→Z13(6+n)→Z20(6+n)→Z26( 6+n-1)→Z20(6+n-2)→…→Z20(6+1)→Z26(6)→Z20(3)→Z26(5)→Z20(4)→Z26(1)→Z20(2)→Z26(2) →Z32(1)→Z26(4)→Z32(5)→Z26(3)→Z32(6)→Z26(6+1)→Z32(6+2)→…→Z26(6+n)→Z31(6+n)→Z3 7(6+n-1)→Z31(6+n-2)→…→Z31(6+1)→Z37(6)→Z31(3)→Z37(5)→Z31(4)→Z37(1)→Z31(2)→Z37( 2)→Z43(1)→Z37(4)→Z43(5)→Z37(3)→Z43(6)→Z37(6+1)→Z43(6+2)→…→Z37(6+n)→Z44(6+n)→ Z2(6+n-1)→Z44(6+n-2)→…→Z44(6+1)→Z2(6)→Z44(3)→Z2(5)→Z44(4)→Z2(1)→Z44(2)→Z2(2).

[0073] It can be seen that both U1 and U2 branches are composed of two minimum equalization units A1 and two minimum equalization units A2 connected in series, and are completely equalized under 8 poles.

[0074] The V-phase and W-phase windings in the stator winding are symmetrically and evenly distributed on the stator core, and will not be illustrated here.

[0075] like Figure 10 As shown, from the hairpin end, the number of hairpins corresponding to the layer of conductors closest to the outer side of the stator core is about twice the number of stator slots Z; the number of hairpins corresponding to the layer of conductors closest to the inner side of the stator core is about half the number of stator slots Z, and the ends of the U-shaped wire windings on the inner circle side are in a state of overlapping in pairs; the number of hairpins corresponding to the remaining layers of conductors is equal to the number of stator slots Z.

[0076] like Figure 11As shown, from the welding end, the number of hairpins in the layer closest to the outer side of the stator core is approximately twice the number of stator slots Z; the number of hairpins in the layer closest to the inner side of the stator core is approximately half the number of stator slots Z, and the number of hairpins in the remaining layers is equal to the number of stator slots Z. From the twist end, the twisting direction of the end windings on the inner circle side is consistent, effectively avoiding cross-interference of the conductors at the inner welding end, and further facilitating the control of the end winding dimensions.

[0077] For example, such as Figure 11 As shown, the three-phase leads or center point are located on the outermost or innermost circle side, and no other wires are needed for bridging at other positions. This winding achieves a relatively simple connection method, reducing manufacturing and material costs. When the leads exit at the hairpin end, the characteristics are the same as those at the soldering end, except for the leads themselves, and will not be described again here.

[0078] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly having small width-to- thickness ratio conductors, characterized by, It includes a stator core and a stator winding; the stator core is provided with a plurality of stator slots, which are arranged sequentially along the circumference of the stator core in a circular array; the winding of the stator winding uses rectangular conductors; Each stator slot contains 3+n layers of conductors arranged radially along the stator core. The three layers closest to the outer edge of the stator core are double conductor layers, designated as the first, second, and third double conductor layers respectively, moving from the outer circumference to the inner circumference of the stator core. The remaining n layers are single conductor layers. n is an odd number greater than or equal to 1. Each double conductor layer contains two conductors arranged sequentially along the circumference of the stator core. Each single conductor layer contains only one conductor. The first double conductor layer... The two conductors in the first layer are defined as conductor 1 and conductor 2 along the circumference of the stator core; the two conductors in the second layer are defined as conductor 3 and conductor 4 along the same circumference of the stator core; the two conductors in the third layer are defined as conductor 5 and conductor 6 along the same circumference of the stator core; and the conductors in all other single-conductor layers are defined as conductor 6+1, conductor 6+2, ..., conductor 6+n along the outer circumference of the stator core towards the inner circumference. The stator winding spacing at the starting end is as follows: the layer of conductors closest to the inner circle of the stator core uses a combination of long and short spacing, while the remaining layers of conductors use only full-spacing spacing; the connection method at the starting end is as follows: conductor 1 is connected to conductor 2 in another stator slot, conductor 3 is connected to conductor 6 in another stator slot, conductor 4 is connected to conductor 5 in another stator slot; conductor a is connected to conductor a+1 in another stator slot, and conductor 6+n is connected to conductor 6+n in another stator slot; The stator winding has the following span at the welding end: only full pitch is used; the connection method at the welding end is as follows: wire 1 is connected to wire 4 in another stator slot, wire 2 is welded to wire 2 in another stator slot, wire 3 is welded to wire 5 in another stator slot, and wire b is connected to wire b+1 in another stator slot. Where a is an odd number, and 6+1≤a<6+n; b is an even number, and 6≤b<6+n; n is the number of single conductor layers in each stator slot, 3+n is the number of all conductor layers in each stator slot, and 6+n is the number of conductors in each stator slot. The calculation formulas for the full distance, short distance, and long distance are as follows: C1 = Z / P, C2 = C1-1; C3 = C1 + 1; Where C1 is the full pitch value, C2 is the short pitch value, C3 is the long pitch value, Z is the number of stator slots on the stator core, and P is the number of poles of the stator winding. The stator winding is composed of several minimum balancing units, and each branch of each phase winding is composed of multiple minimum balancing units connected in series and / or in parallel.

2. A stator assembly having small width-to-thickness ratio conductors according to claim 1, wherein Within the same stator slot, the width of the double conductor layer is greater than the width of the single conductor layer; the width refers to the dimension along the circumferential direction of the stator core.

3. A stator assembly having small width-to-thickness ratio conductors according to claim 2, wherein The height of a single conductor in the double conductor layer closest to the outer circle of the stator core is smaller than the height of a single conductor in the two adjacent double conductor layers in the radial direction of the stator core; the width is larger than the width of a single conductor in the two adjacent double conductor layers in the radial direction of the stator core; the width refers to the dimension along the circumference of the stator core, and the height refers to the dimension along the radial direction of the stator core.

4. An electric machine characterized by Includes the stator assembly described in any one of claims 1-3.

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