Stator assembly and motor

Abstract

The present invention provides a stator assembly and a motor, specifically relating to the field of motor technology. The stator assembly includes a stator core and a stator winding. The stator core is provided with a plurality of slots for winding wiring along the circumferential direction. The stator winding includes L layers of flat wire conductors distributed in the plurality of slots, where L is an even number. The L layers of flat wire conductors include a plurality of stacked coil groups, a plurality of first wave-wound coils, and a plurality of second wave-wound coils. The plurality of stacked coil groups are connected by alternating the first wave-wound coils and the second wave-wound coils so as to be distributed in a ring-shaped chain in the circumferential direction of the stator core. The stator assembly of the present invention can effectively avoid stator winding circulating current, reduce losses, increase slot fill rate, and thereby improve motor efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly and a motor. Background Art

[0002] With the rapid development of new energy vehicle technology, the performance requirements for automotive drive motors are becoming increasingly higher. The main development trends of new energy vehicle motors are miniaturization and high speed, and miniaturization and high speed will inevitably require a significant improvement in motor efficiency.

[0003] Compared to round wire motors, flat wire motors can improve the slot fill rate of the motor. This increase in slot fill rate means that more copper wire can be packed into the motor while maintaining the same space, generating a stronger magnetic field strength and increasing power density. Therefore, more and more flat wire motors are being used in new energy vehicle drive systems. Existing flat wire motors often use short-torque windings to weaken the magnetic potential harmonics of the windings. For example, CN201520265436.3 - A motor and its stator uses short-pitch windings, and CN202010193400.4 - Flat wire continuous wave windings. Although the flat wire continuous wave windings in the stator and motor use full-pitch windings, the stator and motor use staggered windings, making them equivalent to a set of double-layer short-pitch windings. As a result, the conductors in a slot belong to different phases. To ensure insulation reliability, it is necessary to add interlayer insulating paper, which reduces the slot fill rate of the winding and reduces the efficiency of the motor. Summary of the Invention

[0004] In view of the above shortcomings of the prior art, the present invention provides a stator assembly and a motor to improve the problem of circulating current in the stator winding and the problem of reducing the slot fill rate due to interlayer insulation paper.

[0005] To achieve the above-mentioned and other related objectives, the present invention provides a stator assembly, comprising a stator core and a stator winding, wherein the stator core is provided with a plurality of slots for winding wiring along a circumferential direction; the stator winding comprises L layers of flat wire conductors distributed within the plurality of slots, where L is an even number; the L layers of flat wire conductors comprise a plurality of stacked coil groups, a plurality of first wave-wound coils, and a plurality of second wave-wound coils, wherein the plurality of stacked coil groups are connected by alternating the first wave-wound coils and the second wave-wound coils so as to be distributed in a ring-shaped chain in the circumferential direction of the stator core.

[0006] In one example of the present invention, the stator winding is a three-phase winding. In each branch of each phase of the stator winding, the stacked coil group advances one pole pitch along the circumferential direction of the stator core and is connected to the stacked coil group of the second pole pitch through the first wave-wound coil. Then, the second wave-wound coil is used to connect to the stacked coil group of the third pole pitch. Following this rule, the stacked coil group advances one pole pitch along the circumferential direction of the stator core to form the branch.

[0007] In an example of the present invention, the flat wire conductors of each branch in the slot are symmetrical, and all the flat wire conductors in the same slot belong to the winding of the same phase.

[0008] In one example of the present invention, the stacked coil group includes a plurality of stacked coils, each stacked coil including a bent section, two straight sections, and two twisted sections. The two straight sections are respectively connected to the two ends of the bent section, and the two twisted sections are respectively connected to the two straight sections. The two twisted sections are deflected and bent along the circumferential direction of the stator core, with the deflection directions being opposite and close to each other.

[0009] In an example of the present invention, the number of pole pairs of the motor is p, the number of slots is Q, the pole pitch y=Q / (2p), the span of the stacked coil is y, and the two straight segments of the stacked coil are located in adjacent conductor layers.

[0010] In an example of the present invention, the span of the first wave-wound coil is y+1, and the first wave-wound coil is a coil on the same layer, and is used to connect flat wire conductors on the same layer.

[0011] In an example of the present invention, the span of the second wave-wound coil is y-1, and the second wave-wound coil is a coil on the same layer, and is used to connect the flat wire conductor on the same layer.

[0012] In an example of the present invention, the first wave-wound coil and the second wave-wound coil have the same structure, both including a bent section, two straight sections and two twisted sections, the two straight sections are respectively connected to the two ends of the bent section, the two twisted sections are respectively connected to the two straight sections, and the two twisted sections deflect and bend along the circumferential direction of the stator core, and the deflection direction is the same.

[0013] In an example of the present invention, each phase of the stator winding includes 1 branch or an even number of branches greater than or equal to 2.

[0014] In an example of the present invention, the incoming terminal and the outgoing terminal of each branch of each phase of the stator winding are located in the same winding layer.

[0015] Another aspect of the present invention provides a motor including the stator assembly.

[0016] The stator winding of the stator assembly of the present invention is achieved by alternately arranging first wave-wound coils and second wave-wound coils to connect multiple stacked coil groups end to end so that they are distributed in a chain-like manner along the circumferential direction of the stator core. This winding method makes the flat wire conductors of each branch in the slot body symmetrical, and all flat wire conductors in the same slot body belong to the winding of the same phase, which can avoid stator winding circulation current, reduce losses, and improve motor efficiency; eliminate interlayer insulating paper, increase the slot fill rate of the flat wire conductor, and thus improve motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of the stator assembly of the present invention;

[0019] Figure 2 FIG1 is an expanded view of the winding of phase A in the stator winding of the stator assembly in one embodiment of the present invention;

[0020] Figure 3 A schematic structural diagram of a stacked coil of a stator assembly according to an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the structure of the first wave wound coil of the stator assembly in one embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the second wave wound coil of the stator assembly in one embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the winding lead wire of the stator assembly in one embodiment of the present invention;

[0024] Figure 7 A schematic diagram of the partial distribution of flat wire conductors within a slot of a stator assembly in one embodiment of the present invention;

[0025] Figure 8 Schematic diagram of a stator assembly of the present invention in which two branches of the A-phase winding are connected in series to form a parallel branch in one embodiment;

[0026] Figure 9 FIG. 1 is a schematic diagram of a stator assembly of the present invention in which two branches of the A-phase winding are connected in parallel to form two parallel branches in one embodiment.

[0027] Component number description

[0028] 100. Stator assembly; 110. Stator core; 111. Slot body; 120. Stator winding; 1201. U-Pin insertion end; 1202. Welding end; 121. Stacked coil; 1211. First bending section; 1212. First straight section; 1213. First twist section; 122. First wave-wound coil; 1221. Second bending section; 1222. Second straight section; 1223. Second twist section; 123. Second wave-wound coil; 1231. Third bending section; 1232. Third straight section; 1233. Third twist section; 124. Lead wire; 1241. Fourth bending section; 1242. Fourth straight section; 1243. Fourth twist section. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless they conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific embodiments, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0030] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0031] See also Figures 1 to 9 The present invention provides a stator assembly and a motor to improve the circulating current problem of the stator winding and the problem of reducing the slot fill rate by the interlayer insulation paper.

[0032] See also Figure 1 The stator assembly 100 of the present invention includes a stator core 110 and a stator winding 120. The stator core 110 is provided with a plurality of slots 111 for winding wiring. The stator winding 120 includes L layers of flat wire conductors embedded in the slots 111. The L layers of flat wire conductors include a plurality of stacked coil groups, a plurality of first wave-wound coils 122, and a plurality of second wave-wound coils 123. The plurality of stacked coil groups are connected by alternating the first wave-wound coils 122 and the second wave-wound coils 123 so as to be distributed in a ring-shaped chain in the circumferential direction of the stator core 110.

[0033] See also Figure 1 Specifically, the stator core 110 includes a main body that is generally cylindrical, and a plurality of slots 111 are arranged along the inner circumference of the cylindrical main body. The slots 111 are radially open inward. The stator winding 120 adopts a flat wire hairpin winding, which includes a U-Pin insertion end 1201 and a welding end 1202. In this embodiment, the upward end is the U-Pin insertion end 1201, and the downward end is the welding end 1202.

[0034] See also Figure 1 and Figure 2 The stator winding 120 can be a three-phase winding. In each branch of each phase of the stator winding 120, after the stacked coil group is wound for one pole pitch, it is advanced by the first wave-wound coil 122 along the circumferential direction of the stator core 110 by one pole pitch and connected to the stacked coil group within the second pole pitch. After the stacked coil group within the second pole pitch is wound, it is advanced by the second wave-wound coil 123 by one pole pitch and connected to the stacked coil group within the third pole pitch, and the stacked coil group is wound within the third pole pitch. According to this rule, the first wave-wound coil 122 and the second wave-wound coil 123 are alternately arranged so that the stacked coil group is wound one circle along the circumferential direction of the stator core 110, thereby forming a branch. Each branch of each phase in stator winding 120 adopts the aforementioned winding method, differing in that the slot numbers of the slots 111 where the incoming and outgoing wires of each phase reside are different. For example, if stator winding 120 is a three-phase winding, the three phases of the three-phase winding are defined as phases A, B, and C, respectively. The incoming wires of phase A are located in slots 27 and 28, while the incoming wires of phase B can be located in slots 31 and 32, and the incoming wires of phase C can be located in slots 35 and 36. This winding method ensures that the flat wire conductors of each branch within slot 111 are completely symmetrical. All flat wire conductors within the same slot 111 belong to the same phase winding, eliminating the need for insulating paper between layers. This increases the slot fill rate of the flat copper wire, thereby improving motor efficiency.

[0035] In the present invention, each phase of the stator winding 120 includes one or an even number of branches greater than or equal to two, and the input and output terminals of each branch of each phase of the stator winding 120 are located on the same winding layer. For example, if a branch enters the sixth layer, it also exits the sixth layer.

[0036] See also Figure 1 and Figure 2The stacked coil assembly includes multiple stacked coils 121. In one embodiment, the motor has a pole pair number p, a slot number Q, and a pole pitch y = Q / (2p). Therefore, the span of stacked coil 121 is y, and the two sides of stacked coil 121 are located in adjacent conductor layers of different slots. The span of the first wave-wound coil 122 is y+1, connecting coils on the same layer of adjacent stacked coil assemblies. The span of the second wave-wound coil 123 is y-1, connecting coils on the same layer of adjacent stacked coil assemblies. Each branch of each phase of the stator winding is connected by alternating first and second wave-wound coils 122, 123, to form a complete branch.

[0037] See also Figure 1 and Figure 3 In one embodiment, the lapped coil 121 includes a bent section at the head, a straight section connected to the bent section, and a twisted section connected to the straight section, respectively designated as a first bent section 1211, a first straight section 1212, and a first twisted section 1213. The first bent section 1211 is connected to a first straight section 1212 at each end, and the two first straight sections 1212 are parallel to each other. The other ends of the two first straight sections 1212 are connected to a first twisted section 1213. The two first twisted sections 1213 deflect and bend along the circumference of the stator core, with the deflection directions being opposite and close to each other. The first bent section 1211 of the lapped coil 121 is molded and inserted from the U-pin insertion end 1201 into the slot 111 of the stator core 110. The first straight section 1212 is located within the slot 111. The two first twisted sections 1213 extend from the slot 111 and deflect and bend along the circumference of the stator core before being welded at the welding end. The plurality of lap-wound coils 121 in the lap-wound coil assembly are welded together via welding ends.

[0038] See also Figure 4 The first wave-wound coil 122 is a quasi-U-shaped coil, comprising a bend segment, a straight segment connected to the bend segment, and a twist segment connected to the straight segment, denoted as a second bend segment 1221, a second straight segment 1222, and a second twist segment 1223, respectively. The second bend segment 1221 is connected to a second straight segment 1222 at each end, and the two second straight segments 1222 are parallel to each other. The other ends of the two second straight segments 1222 are connected to a second twist segment 1223, and the two second twist segments 1223 are deflected and bent in the same direction along the circumference of the stator core. The two second twist segments 1223 of the first wave-wound coil 122 are located in the same coil layer. For example, one second twist segment 1223 is located in the first layer of the winding, and the other is also located in the first layer of the winding; one second twist segment 1223 is located in the Lth layer of the winding, and the other is also located in the Lth layer of the winding. Therefore, the first wave-wound coil 122 is a coil in the same layer.

[0039] See also Figure 5The second wave-wound coil 123 has the same structure as the first wave-wound coil 122, differing in its span, which is y-1. The second wave-wound coil 123 also includes a bend, a straight, and a twist segment, designated as a third bend segment 1231, a third straight segment 1232, and a third twist segment 1233, respectively. The third bend segment 1231 is connected to a third straight segment 1232 at each end, and the two third straight segments 1232 are parallel to each other. The other ends of the two third straight segments 1232 are connected to a third twist segment 1233, and the two third twist segments 1233 are bent in the same direction along the circumference of the stator core. The two third twist segments 1233 are located in the same layer of the winding. For example, one third twist segment is located in the first layer of the winding, and the other third twist segment 1233 is located in the first layer of the winding; one third twist segment is located in the Lth layer, and the other is also located in the Lth layer. Therefore, the second wave-wound coil 123 is a coil on the same layer.

[0040] See also Figure 6 Lead wire 124 is a semi-U-shaped coil, comprising a bend, a straight segment, and a twist segment, designated as fourth bend segment 1241, fourth straight segment 1242, and fourth twist segment 1243, respectively. Fourth bend segment 1241, fourth straight segment 1242, and fourth twist segment 1243 are sequentially connected. Preferably, lead wire 124 for each phase of stator winding 120 is located at U-pin insertion end 1201, facilitating welding and coating at welding end 1202 and improving production efficiency.

[0041] The following describes the winding method of the present invention in detail using a three-phase winding as an example. In this embodiment, the three phases are defined as phase A, phase B, and phase C, respectively. An example is provided with 8 poles, 48 ​​slots, 6 layers of flat wire conductors in each slot, and 2 parallel branches per pole and per phase. The number of slots Q = 48, the number of conductor layers L = 6, the number of pole pairs P = Q / (2p) = 4, the pole pitch y = 6, the span of the stacked coil 121 is 6, the span of the first wave-wound coil 122 is 7, and the span of the second wave-wound coil is 5.

[0042] In order to express the wiring of the present invention more clearly, Figure 2 The winding expansion diagram only shows the winding of the A-phase coil group and does not include the B-phase and C-phase coil groups. The B-phase and C-phase coil groups are wound in the same manner as the A-phase coil group, differing only in the slot numbers where the incoming and outgoing wires are located. For example, the incoming wires of the A-phase winding are located in slots 27 and 28, while the incoming wires of the B-phase winding can be located in slots 31 and 32, and the incoming wires of the C-phase winding can be located in slots 35 and 36. Phase A consists of a first branch A1X1 and a second branch A2X2, where A1 and A2 are the incoming wires of the winding, and X1 and X2 are the outgoing wires. Figure 2Each slot body has 6 layers, 5 layers, 4 layers, 3 layers, 2 layers, and 1 layer from left to right. Each stacked coil group includes a first stacked coil, a second stacked coil, and a third stacked coil that are stacked.

[0043] The specific winding method of the A-phase winding is as follows: the first branch of the A-phase winding enters from the No. 27 slot body, the first lapped coil of the first lapped coil group enters from the 6th layer of the No. 27 slot body, and comes out from the 5th layer of the No. 33 slot body; the second lapped coil enters from the 4th layer of the No. 27 slot body, and comes out from the 3rd layer of the No. 33 slot body; the third lapped coil enters from the 2nd layer of the No. 27 slot body, and comes out from the 1st layer of the No. 33 slot body, the first lapped coil, the second lapped coil and the third lapped coil are connected by welding at the welding end 1202; then they are connected to the flat wire conductor in the No. 33 slot body through the first wave-wound coil, and a twist section of the first wave-wound coil is connected to the No. 33 slot body. The first layer of flat wire conductor in the body is connected, and the other end moves forward 7 slots along the circumferential direction of the stator core to enter slot 40, and the second stacked coil group is wound in slot 40 and slot 34. The winding rule is opposite to that of the first stacked coil group, that is, the first stacked coil enters from the first layer of slot 40 and comes out from the second layer of slot 34; the second stacked coil enters from the third layer of slot 40 and comes out from the fourth layer of slot 34; the third stacked coil enters from the fifth layer of slot 40 and comes out from the sixth layer of slot 34. The other twist section of the first wave wound coil is connected to the first layer of flat wire conductor in slot 40; and then passes through the The second wave-wound coil is connected to the flat wire conductor in slot No. 34, one twist section of the second wave-wound coil is connected to the 6th layer of flat wire conductor in slot No. 34, and the other twist section moves forward along the circumferential direction of the stator core across 5 slots into slot No. 39, and the third stacked coil group is wound in slot No. 39 and slot No. 45, and the winding pattern is consistent with that of the first stacked coil group, and the other twist section of the second wave-wound coil is connected to the 6th layer of flat wire conductor in slot No. 39; then it passes through the first wave-wound coil to slot No. 4, and the fourth stacked coil group is wound in slot No. 4 and slot No. 46, and the winding pattern is consistent with that of the second stacked coil group; through The second wave-wound coil group spans to slot 3, where the fifth stacked coil group is wound between slots 3 and 9, following the same winding pattern as the first stacked coil group. The first wave-wound coil spans to slot 16, where the sixth stacked coil group is wound between slots 16 and 10, following the same winding pattern as the second stacked coil group. The second wave-wound coil spans to slot 15, where the seventh stacked coil group is wound between slots 15 and 21, following the same winding pattern as the first stacked coil group. The first wave-wound coil spans to slot 28, where the eighth stacked coil group is wound between slots 28 and 22, following the same winding pattern as the second stacked coil group. Multiple stacked coil groups are connected by alternating first and second wave-wound coils to form the first branch A1X1.

[0044] The second branch enters from slot No. 28 and connects the adjacent stacked coil groups in an alternating manner of the second wave-wound coil and the first stacked wave-wound coil, that is, the first stacked coil of the first stacked coil group enters from the 6th layer of slot No. 28 and exits from the 5th layer of slot No. 34; the second stacked coil enters from the 4th layer of slot No. 28 and exits from the 3rd layer of slot No. 34; the third stacked coil enters from the 2nd layer of slot No. 28 and exits from the 1st layer of slot No. 34, completing the winding of the first stacked coil group; through the second The wave-wound coil spans to slot body 39, and the second stacked coil group is wound in slot body 39 and slot body 33. The winding rule is opposite to the first stacked coil group, that is, the first stacked coil enters from the first layer of slot body 39 and comes out from the second layer of slot body 33; the second stacked coil enters from the third layer of slot body 39 and comes out from the fourth layer of slot body 33; the third stacked coil enters from the fifth layer of slot body 39 and comes out from the sixth layer of slot body 33. A button section of the second wave-wound coil is connected to the first layer of slot body 34. The flat wire conductor is connected, and the other twist section is connected to the first layer of flat wire conductor of slot body 39; then it passes through the first wave winding coil to slot body 40, and the third stacked coil group is wound in slot body 40 and slot body 46, and the winding pattern is the same as the first stacked coil group; then it passes through the second wave winding coil to slot body 3, and the fourth stacked coil group is wound in slot body 3 and slot body 45; then it passes through the first wave winding coil to slot body 4, and the fifth stacked coil group is wound in slot body 4 and slot body 10, and the winding pattern is the same as the first The stacked coil groups are consistent; the second wave-wound coil spans to slot No. 15, and the sixth stacked coil group is wound on slot No. 15 and slot No. 9, with the same winding pattern as the second stacked coil group; the first wave-wound coil spans to slot No. 16, and the seventh stacked coil group is wound on slot No. 16 and slot No. 22, with the same winding pattern as the first stacked coil group; the second wave-wound coil spans to slot No. 27, and the eighth stacked coil group is wound on slot No. 27 and slot No. 21, thereby forming the second branch A2X2.

[0045] The winding path of the first branch A1X1 of the A-phase winding is as follows:

[0046] A1->27(6) ->33(5) ->27(4) ->33(3) ->27(2) ->33(1) ->40(1) ->34(2) ->40(3) ->34(4) ->40(5) ->34(6) ->39(6) ->45(5) ->39(4) ->45(3) ->39(2) ->45(1)->4(1) ->46(2) ->4(3) ->46(4) ->4(5) ->46(6) ->3(6) ->9(5) ->3(4) ->9(3) ->3(2) ->9(1) ->16(1) ->10(2) ->16(3) ->10(4) ->16(5) ->10(6) ->15(6) ->21(5) ->15(4) ->21(3) ->15(2) ->21(1) ->28(1) ->22(2) ->28(3) ->22(4) ->28(5) ->22(6)->X1

[0047] The winding path of the second branch A2X2 of the A-phase winding is as follows:

[0048] A2->28(6) ->34(5) ->28(4) ->34(3) ->28(2) ->34(1) ->39(1) ->33(2) ->39(3) ->33(4) ->39(5) ->33(6) ->40(6) ->46(5) ->40(4) ->46(3) ->40(2) ->46(1)->3(1) ->45(2) ->3(3) ->45(4) ->3(5) ->45(6) ->4(6) ->10(5) ->4(4) ->10(3) ->4(2) ->10(1) ->15(1) ->9(2) ->15(3) ->9(4) ->15(5) ->9(6) ->16(6) ->22(5) ->16(4) ->22(3) ->16(2) ->22(1) ->27(1) ->21(2) ->27(3) ->21(4) ->27(5) ->21(6)->X2

[0049] The numbers outside the brackets represent the slot numbers, and the numbers inside the brackets represent the layer numbers.

[0050] After winding of phase A is completed, phase B and phase C are wound in the same way. The incoming line end of phase B is slots 31 and 32, and the incoming line end of phase C is slots 35 and 36. After winding is completed, the distribution of the windings in the slots under one pole is as follows Figure 7As shown, the conductors in each slot belong to the same phase, the interlayer insulation paper is eliminated, the slot fill rate of the winding is improved, the resistance of the winding is reduced, the copper loss of the motor is reduced, and the efficiency of the motor is improved.

[0051] The present invention improves the manufacturing efficiency of the stator winding by forming, inserting and welding a stacked coil, a first wave-wound coil, a second wave-wound coil and a semi-U-shaped coil (lead-out wire) to form a complete branch circuit.

[0052] See also Figure 8 and Figure 9 , the two branches A1X1 and A2X2 of phase A can be connected in series to form a parallel branch, that is, the outlet end of the first branch is connected to the incoming end of the second branch; or they can be connected in parallel to form two parallel branches, such as Figure 9 A star connection is shown, but a delta connection may also be used in other embodiments.

[0053] On the other hand, the present invention also provides a motor, which includes the stator assembly of the present invention. The stator assembly of the present invention is used to avoid circulating current, reduce losses, and improve motor efficiency through reasonable winding wiring; the lead wires of each phase of the stator winding are set at the plug-in end, which facilitates unified twisting, welding and coating of the welding end, thereby improving production efficiency.

[0054] It should be noted that the structures of the stator and the motor are not described in detail in the present invention and can be achieved through conventional technical means, which will not be described in detail here.

[0055] The stator assembly of the present invention utilizes rational winding routing to ensure symmetry among the conductor branches within the slots, with conductors within the same slot belonging to the same phase winding. This prevents circulating currents, reduces losses, and improves the motor's power density and efficiency. Furthermore, interlayer insulation paper can be eliminated, increasing the slot fill rate and thus improving motor efficiency. Therefore, the present invention effectively overcomes several practical problems of the prior art and offers significant practical value and practical significance.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A stator assembly, characterized in that: include: The stator core is provided with a plurality of slots for winding wiring along the circumferential direction; The stator winding includes L layers of flat wire conductors distributed in the plurality of slots, where L is an even number; The L-layer flat wire conductor includes a plurality of stacked coil groups, a plurality of first wave coils, and a plurality of second wave coils. The plurality of stacked coil groups are connected by alternating the first wave coils and the second wave coils so as to be distributed in a ring-shaped chain in the circumferential direction of the stator core. The stator winding is a three-phase winding. In each branch of each phase of the stator winding, the stacked coil group advances one pole pitch along the circumferential direction of the stator core, is connected to the stacked coil group of the second pole pitch via the first wave-wound coil, and is then connected to the stacked coil group of the third pole pitch via the second wave-wound coil. This pattern is repeated for one cycle along the circumferential direction of the stator core to form the branch. The flat wire conductors of each branch in the slot are symmetrical, and all the flat wire conductors in the same slot belong to the winding of the same phase.

2. The stator assembly according to claim 1, characterized in that The stacked coil group includes a plurality of stacked coils, each of which includes a bent section, two straight sections, and two twisted sections. The two straight sections are respectively connected to the two ends of the bent section, and the two twisted sections are respectively connected to the two straight sections. The two twisted sections are respectively deflected and bent along the circumferential direction of the stator core, with the deflection directions being opposite and close to each other.

3. The stator assembly according to claim 2, characterized in that The number of pole pairs of the motor is p, the number of slots is Q, the pole pitch y=Q / (2p), the span of the stacked coil is y, and the two straight segments of the stacked coil are located in adjacent conductor layers.

4. The stator assembly according to claim 3, characterized in that The span of the first wave-wound coil is y+1. The first wave-wound coil is a coil on the same layer and is used to connect flat wire conductors on the same layer.

5. The stator assembly according to claim 4, characterized in that The span of the second wave-wound coil is y-1. The second wave-wound coil is a coil on the same layer and is used to connect the flat wire conductor on the same layer.

6. The stator assembly according to claim 1, wherein: The first wave-wound coil and the second wave-wound coil have the same structure, both including a bent section, two straight sections and two twisted sections. The two straight sections are respectively connected to the two ends of the bent section, and the two twisted sections are respectively connected to the two straight sections. The two twisted sections are respectively deflected and bent along the circumferential direction of the stator core, and the deflection directions are the same.

7. The stator assembly according to claim 1, characterized in that Each phase of the stator winding includes one branch or an even number of branches greater than or equal to two.

8. The stator assembly according to claim 1, wherein: The incoming terminal and the outgoing terminal of each branch of each phase of the stator winding are located in the same winding layer.

9. A motor characterized by The stator assembly comprises any one of claims 1 to 8.

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