Motor stator, motor, transmission system and vehicle

Abstract

The present disclosure relates to an electric machine stator in which a stator coil comprises three first phase windings, each first phase winding comprising a plurality of layer windings, the plurality of layer windings being connected in series, and each first phase winding comprising a plurality of hairpin-shaped conductors connected in series, the hairpin-shaped conductor comprises a short-span hairpin-shaped conductor and a long-span hairpin-shaped conductor, a first conductor leg and a second conductor leg of the short-span hairpin-shaped conductor are respectively arranged in two adjacent layers, and a first conductor leg and a second conductor leg of the long-span hairpin-shaped conductor are respectively arranged in the innermost layer and the outermost layer; the welding end of the wire outlet section of each hairpin-shaped conductor and the welding end of the wire inlet section of another adjacent hairpin-shaped conductor in the same first-phase winding abut against and are aligned in the radial direction.

Description

Technical Field

[0001] The present disclosure relates to a motor stator, a motor including the motor stator, a drive system including the motor, and a vehicle including the drive system. Background Art

[0002] The stator of an AC motor is usually composed of a laminated iron core and a stator coil. A periodically varying alternating current is applied to the stator coil, and a continuously rotating air-gap magnetic field of the same frequency is thus excited. The rotating air-gap magnetic field can drive the rotation of the rotor of the AC motor, and the AC motor can be either an induction motor or a synchronous motor.

[0003] In order to improve the performance of the AC motor, flat wire conductors are increasingly used for the stator coil of the AC motor. Compared with round wire conductors, flat wire conductors are beneficial to improving the slot fill factor of the motor, and thus can generate a stronger magnetic field, thereby improving the power density. Summary of the Invention

[0004] The present disclosure provides a motor stator. The stator coil of the motor stator is composed of flat wires, especially Hair-PIN conductors. The welding ends of the respective Hair-PIN conductors of the motor stator according to the present disclosure have a neat arrangement, which makes the wiring of the welding ends easy and also facilitates the simplification of the tooling for twisting the welding ends.

[0005] The present disclosure provides a motor stator, the motor stator including: a stator core configured as a hollow cylinder, the stator core having a plurality of slots in a circumferential direction, the slots extending through the stator core in a longitudinal direction; and a stator coil including three first-phase windings, each first-phase winding including a plurality of layer windings connected in series, and each first-phase winding including a plurality of Hair-PIN conductors connected in series, wherein the Hair-PIN conductors respectively have a first conductor leg and a second conductor leg and a non-welding end connected therebetween, the first conductor leg and the second conductor leg are respectively arranged in different slots, multiple layers of conductor legs are arranged in each slot, an inlet section is provided at an end of the first conductor leg, an outlet section is provided at an end of the second conductor leg, the inlet section and the outlet section extend out of the slot; wherein the Hair-PIN conductors include short-span Hair-PIN conductors and long-span Hair-PIN conductors, the first conductor leg and the second conductor leg of the short-span Hair-PIN conductor are respectively arranged in two adjacent layers, the first conductor leg and the second conductor leg of the long-span Hair-PIN conductor are respectively arranged in the innermost layer and the outermost layer; wherein the welding ends of the outlet sections of each Hair-PIN conductor and the welding ends of the inlet sections of another adjacent Hair-PIN conductor in the same first-phase winding are abutted and aligned with each other in a radial direction.

[0006] In an embodiment according to the present disclosure, the pitch of the short-span hairpin-shaped conductor is a full pitch, and the pitch of the long-span hairpin-shaped conductor is a short pitch or a long pitch.

[0007] In an embodiment according to the present disclosure, the number of slots per pole per phase of the motor stator is 3.

[0008] In an embodiment according to the present disclosure, the number of layers of the conductor legs is 2(N + 2), where N is a positive integer.

[0009] In an embodiment according to the present disclosure, the number of layers of the conductor legs is 6; each first-phase winding includes a first-layer winding, a second-layer winding, and a third-layer winding. The first-layer winding is arranged in the first and second layers, the second-layer winding is arranged in the third and fourth layers, and the third-layer winding is arranged in the fifth and sixth layers; short-span hairpin-shaped conductors are arranged in the first-layer winding, the second-layer winding, and the third-layer winding, and the short-span hairpin-shaped conductors have a clockwise inclination direction; long-span hairpin-shaped conductors are arranged between the first-layer winding and the third-layer winding, and the long-span hairpin-shaped conductors have the clockwise inclination direction; short-span hairpin-shaped conductors are arranged between the first-layer winding and the second-layer winding, and the short-span hairpin-shaped conductors have a counterclockwise inclination direction, and short-span hairpin-shaped conductors are arranged between the second-layer winding and the third-layer winding, and the short-span hairpin-shaped conductors have a counterclockwise inclination direction.

[0010] In an embodiment according to the present disclosure, the number of slots of the motor stator is 54, the pole pitch is 9, and the number of slots per pole per phase is 3; each pole-phase group in the first-layer winding, the second-layer winding, and the third-layer winding includes first, second, and third short-pitch hairpin-shaped conductors, the pitches of the three short-pitch hairpin-shaped conductors are 9 and have the clockwise inclination direction; the pole-phase group between the first-layer winding and the second-layer winding includes first, second, and third short-pitch hairpin-shaped conductors, the pitches of the three short-pitch hairpin-shaped conductors are 9 and have the counterclockwise inclination direction; wherein, the first short-pitch hairpin-shaped conductors are connected in series to form a first series circuit, the second short-pitch hairpin-shaped conductors are connected in series to form a second series circuit, and the third short-pitch hairpin-shaped conductors are connected in series to form a third series circuit; the pole-phase group between the first-layer winding and the third-layer winding includes first, second, and third long-pitch hairpin-shaped conductors, the three long-pitch hairpin-shaped conductors have the clockwise inclination direction, the pitch of the first long-pitch hairpin-shaped conductor is 11, and connects the first series circuit and the third series circuit, the pitch of the second long-pitch hairpin-shaped conductor is 8, and connects the second series circuit and the first series circuit, the pitch of the third long-pitch hairpin-shaped conductor is 8, and connects the third series circuit and the second series circuit.

[0011] In an embodiment according to the present disclosure, the stator coil further includes three second-phase windings, the second-phase windings and the first-phase windings have the same structure, the arrangement of the hairpin-shaped conductors in the second-phase windings is offset by a pole pitch relative to the arrangement of the hairpin-shaped conductors in the first-phase windings, and the first-phase windings and the second-phase windings are connected in parallel.

[0012] In an embodiment according to the present disclosure, each first-phase winding has a winding inlet end and a winding outlet end, the winding inlet end is connected to one of the outermost first conductor legs, and the winding outlet end is connected to the other of the outermost second conductor legs.

[0013] The present disclosure also provides a motor, and the motor includes the motor stator described above.

[0014] The present disclosure also provides a drive system, and the drive system includes the motor described above.

[0015] The present disclosure also provides a vehicle, and the vehicle includes the drive system described above. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0017] Figure 1 The structural schematic diagram of the motor stator according to an embodiment of the present disclosure is shown.

[0018] Figure 2 The schematic diagram of the welding end of the stator coil according to an embodiment of the present disclosure is shown.

[0019] Figure 3 The schematic diagram of the non-welding end of the stator coil according to an embodiment of the present disclosure is shown.

[0020] Figure 4 The schematic diagram of the short-span hairpin-shaped conductor according to an embodiment of the present disclosure is shown.

[0021] Figure 5 The schematic diagram of the long-span hairpin-shaped conductor according to an embodiment of the present disclosure is shown.

[0022] Figure 6 The schematic diagram of another long-span hairpin-shaped conductor according to an embodiment of the present disclosure is shown.

[0023] Figure 7 The winding diagram of the W-phase winding of the stator coil according to an embodiment of the present disclosure is shown.

[0024] Figure 8 The winding diagram of the V-phase winding of the stator coil according to an embodiment of the present disclosure is shown, and

[0025] Figure 9 The winding diagram of the U-phase winding of the stator coil according to an embodiment of the present disclosure is shown. Detailed implementation manners

[0026] In order to make the objectives, technical solutions, and advantages of the technical solutions of the present disclosure clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present disclosure in conjunction with the accompanying drawings of the specific embodiments of the present disclosure. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts fall within the scope of protection of the present disclosure.

[0027] Compared to the embodiments shown in the drawings, feasible embodiments within the scope of protection of the present disclosure may have fewer components, additional components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0028] Figure 1 FIG1 shows a schematic structural diagram of a motor stator 100 according to an embodiment of the present disclosure. The motor stator 100 includes a stator core 110. The stator core 110 is constructed as a hollow cylinder. The stator core 110 can be made of stacked silicon steel sheets, for example. A plurality of slots 101 are arranged along the circumferential direction of the stator core 110. Figure 1 In the embodiment shown, the stator core 110 has 54 slots 101. In the embodiment according to the present disclosure, an insulating member 102, such as insulating paper, may be further provided in the slot 101.

[0029] Stator coils 120 are arranged in slots 101 of the stator core 110. In an embodiment of an electric motor configured as an AC motor, such as an asynchronous motor or a synchronous motor, the stator coils 120 have three phase windings for the three phases U, V, and W. Each phase winding has at least one branch. If there are multiple branches, the multiple branches are connected in parallel. Figure 1 In the exemplary embodiment shown, a phase winding having two branches is shown by way of example, and each branch of each phase winding has two connection ends 150 , namely a winding feed end and a winding discharge end. Figure 1 A total of 12 connection terminals 150 are shown.

[0030] In the embodiment according to the present disclosure, a phase winding may have multiple layers, that is, a phase winding may include multiple layer windings, and these layer windings are connected in series. Figure 1 In the embodiment shown, one phase winding is composed of three layer windings. These three layer windings form three concentric rings. Accordingly, multiple layers of conductor legs need to be arranged in one slot 101, and the number of layers of conductor legs is equal to the number of layer windings multiplied by 2. Figure 1 In the embodiment shown, six layers of conductor legs are arranged in one slot 101 .

[0031] Each phase winding is composed of a plurality of hairpin conductors 121 connected in series. The specific structure of the hairpin conductor 121 is as follows: Figures 4 to 5Shown in. The hairpin-shaped conductor 121 has a first conductor leg 401 and a second conductor leg 402 and a non-welded end 407 connected therebetween. The first conductor leg 401 and the second conductor leg 402 are respectively arranged in different slots 101. The end of the first conductor leg 401 has an incoming line section 403, and the end of the second conductor leg 402 has an outgoing line section 404. The incoming line section 403 and the outgoing line section 404 extend out of the slot 101. The incoming line section 403 of the first hairpin-shaped conductor 121 is bent relative to the first conductor leg 401, for example, bent in the counterclockwise direction, so as to be close to and abut against the outgoing line section 404 of the second hairpin-shaped conductor 121. The outgoing line section of the second hairpin-shaped conductor 121 is bent relative to the second conductor leg 402, for example, bent in the clockwise direction, so as to be close to and abut against the incoming line section 403 of the first hairpin-shaped conductor 121. An incoming line welding end 405 is formed at the end of the incoming line section 403, and an outgoing line welding end 406 is formed at the end of the outgoing line section 404. The incoming line welding end 405 of the first hairpin-shaped conductor 121 is welded to the outgoing line welding end 406 of the second hairpin-shaped conductor 121. Multiple hairpin-shaped conductors 121 are connected in sequence in this way to form a phase winding. In Figure 1 In, the upper end of the stator coil 120 is the welding end 130 of the stator coil 120, which will be shown in detail in Figure 2 In. In Figure 1 In, the lower end of the stator coil 120 is the non-welded end of the stator coil 120, that is, the crown end 140, which will be shown in detail in Figure 3 In.

[0032] Figure 2 Shows a schematic diagram of the welding end 130 of the stator coil 120 according to an embodiment of the present disclosure. As shown in Figure 2As shown, the incoming line section 403 is bent counterclockwise in the circumferential direction, the outgoing line section 404 is bent clockwise in the circumferential direction, and the outgoing line welding end 406 of the outgoing line section 404 of each hairpin-shaped conductor 121 abuts and aligns with the incoming line welding end 405 of the incoming line section 403 of another adjacent hairpin-shaped conductor 121 in the same phase winding in the radial direction. In the present disclosure, all the incoming line sections 403 are uniformly bent counterclockwise, and all the outgoing line sections 404 are uniformly bent clockwise, and there is no specially bent incoming line section or outgoing line section. All the welding ends 405 and 406 abut and align with each other in pairs, which makes the welding operation between the welding ends 405 and 406 very easy. In the prior art, especially when there are multiple layers of windings in the phase winding, there are some cases where the welding ends cannot abut and align with each other. To connect such welding ends, additional conductors are usually required to bridge and connect the two welding ends. On the one hand, this increases the complexity of the welding operation. On the other hand, it also poses special requirements on the tooling for bending the incoming line section and the outgoing line section, increasing the complexity of the tooling, or the tooling cannot bend all the incoming line sections and the outgoing line sections in place through simple operations, such as two bending operations.

[0033] To achieve Figure 2 the neat arrangement of the welding ends as shown, a new type of hairpin-shaped conductor needs to be designed and arranged. On the one hand, the new type of hairpin-shaped conductor needs to connect multiple layers of windings in a phase winding in series. On the other hand, when the number of slots per pole per phase or the pole-phase group is greater than 1, the new type of hairpin-shaped conductor also needs to connect in series between the hairpin-shaped conductors of different orders in a pole-phase group. This will be described in detail later. Figure 3 FIG. shows a schematic diagram of the non-welding end 140 of the stator coil 120 according to an embodiment of the present disclosure. As can be seen from Figure 3 it, the hairpin-shaped conductor 121 has two shapes, one is the short-span hairpin-shaped conductor 310, and the other is the long-span hairpin-shaped conductor 320. The first conductor leg and the second conductor leg of the short-span hairpin-shaped conductor 310 are respectively arranged in two adjacent layers of the stator slot. The first conductor leg and the second conductor leg of the long-span hairpin-shaped conductor 320 are respectively arranged in the innermost layer and the outermost layer of the stator slot. In Figures 1 to 3In the case of the six-layer structure shown, the two conductor legs of the long-span hairpin-shaped conductor 320 are respectively arranged in the first layer and the sixth layer. In an embodiment according to the present disclosure, the pitch of the short-span hairpin-shaped conductor 310 can be, for example, a full pitch, and the pitch of the long-span hairpin-shaped conductor 320 can be, for example, a short pitch or a long pitch. In an embodiment according to the present disclosure, the pole pitch refers to the number of slots occupied by each magnetic pole of the motor along the circumferential surface of the air gap, and the pole pitch is equal to the number of stator slots / the number of magnetic poles. The pitch refers to the number of slots spanned between the two conductor legs of a hairpin-shaped conductor. When the pitch is equal to the pole pitch, the pitch of the hairpin-shaped conductor is called a full pitch; when the pitch is less than the pole pitch, the pitch of the hairpin-shaped conductor is called a short pitch, and when the pitch is greater than the pole pitch, the pitch of the hairpin-shaped conductor is called a long pitch. Figure 5 A long-span hairpin-shaped conductor 321 with a long pitch is shown. By lengthening the non-welded end, the pitch between the two conductor legs of the long-span hairpin-shaped conductor 321 is greater than the pole pitch. Figure 6 A long-span hairpin-shaped conductor 322 with a short pitch is shown. By twisting the non-welded end, the pitch between the two conductor legs of the long-span hairpin-shaped conductor 322 is less than the pole pitch.

[0034] To more clearly illustrate how the hairpin-shaped conductors 121, especially the short-span hairpin-shaped conductor 310 and the long-span hairpin-shaped conductor 320, are connected into phase windings and stator coils, Figure 7 、 Figure 8 and Figure 9 show the winding diagrams of the stator coils according to the embodiments of the present disclosure. In the embodiments shown in Figure 7 、 Figure 8 and Figure 9 , the stator coil includes three phase windings, namely the W-phase winding, the V-phase winding, and the U-phase winding. Each phase winding has two branches, namely the first phase winding and the second phase winding, and the first phase winding and the second phase winding are connected in parallel. The stator core has 54 slots, which are labeled 1, 2, 3... 54 respectively in Figure 7 、 Figure 8 and Figure 9 . Six conductor legs are arranged in each slot. That is to say, one slot can be divided into 6 layers, which are labeled 1, 2, 3, 4, 5, 6 respectively. In an embodiment according to the present disclosure, the number of layers of the stator slots can also be 2(N + 2), where N is a positive integer. That is to say, the number of layers of the stator slots can be 6, 8, 10... Figure 7 、 Figure 8 and Figure 9 The dotted lines shown represent the distance spanned by the non-welded end of a hairpin-shaped conductor. The number of layers and slots spanned by the non-welded end of the hairpin-shaped conductor can be clearly seen from the winding diagrams shown in Figure 7 、 Figure 8 and Figure 9 . Figure 7The solid lines shown represent the connection between the incoming section of one hairpin-shaped conductor and the outgoing section of another hairpin-shaped conductor. As can be seen from Figure 7 、 Figure 8 and Figure 9 the winding diagrams shown, the number of layers and slots spanned by the connection between the hairpin-shaped conductors can be clearly seen. As shown in Figure 7 、 Figure 8 and Figure 9 the connection between the hairpin-shaped conductors in the present disclosure has exactly the same span, that is, it spans the same number of layers (2 layers) and the same number of slots (9 slots). Therefore, the incoming section and the outgoing section of the hairpin-shaped conductor for bridging also have the same span. This makes the bending of the incoming section and the outgoing section simple, and the tooling for bending can also be designed more simply.

[0035] Each phase winding, that is, the first phase winding and the second phase winding, respectively includes three layer windings, that is, the first layer winding, the second layer winding and the third layer winding. The first layer winding is arranged in the first and second layers, the second layer winding is arranged in the third and fourth layers, and the third layer winding is arranged in the fifth and sixth layers. Short-span hairpin-shaped conductors are arranged in the first layer winding, the second layer winding and the third layer winding, and the short-span hairpin-shaped conductors have a clockwise inclination direction. The number of layers spanned by the short-span hairpin-shaped conductors in the layer winding is 2, and the number of slots spanned is 9. Such hairpin-shaped conductors spanning two layers can form a neater arrangement of welding ends compared to non-layer-spanning hairpin-shaped conductors, and in the case where the phase winding includes the first and second phase windings, the space in the slots can be fully utilized to increase the slot fill factor.

[0036] Long-span hairpin-shaped conductors are arranged between the first layer winding and the third layer winding to connect the first layer winding and the third layer winding together, and the long-span hairpin-shaped conductors have a clockwise inclination direction. The number of layers spanned by the long-span hairpin-shaped conductors is 6. One of the long-span hairpin-shaped conductors spans 11 slots, and the other two span 8 slots, which will be described in detail later.

[0037] Short-span hairpin-shaped conductors are arranged between the first layer winding and the second layer winding, and the short-span hairpin-shaped conductors have a counterclockwise inclination direction. Short-span hairpin-shaped conductors are also arranged between the second layer winding and the third layer winding, and the short-span hairpin-shaped conductors have a counterclockwise inclination direction, where the counterclockwise inclination direction is opposite to the clockwise inclination direction. The number of layers spanned by the short-span hairpin-shaped conductors between the layer windings is 2, and the number of slots spanned is 9.

[0038] The series connection between the three layer windings is achieved through the long-span windings and short-span windings arranged between the layer windings. The following is referred to Figure 7 、 Figure 8 and Figure 9Continue to illustrate the case where each pole-phase group in each layer winding includes three hairpin-shaped conductors.

[0039] In the process of designing a multi-pole AC motor, first, the arrangement of the phase windings or the connection of the hairpin-shaped conductors needs to be determined. The arrangement of the phase windings should conform to specific principles. For example, the number of slots occupied by each phase winding, that is, the number of hairpin-shaped conductors, is equal; the synthesized fundamental wave electromotive force and magnetic potential are the largest; the non-working harmonics are the smallest, etc. The following takes the Figure 7 , Figure 8 and Figure 9 shown embodiments as examples to illustrate the arrangement of the phase windings. In this embodiment, the number of phases of the motor m = 3, the number of slots of the motor stator Z = 54, the number of pole pairs p = 3 (including the first pole pair, the second pole pair, and the third pole pair), and the number of poles of the motor rotor is 2*p = 6. First, the stator slots are allocated to each phase and each pole, that is, the number of slots per pole per phase q = Z / (2p*m) = 3 is determined. The electrical angle range of one pole is 180°. For a three-phase winding, the electrical angle occupied by each phase is 60°, that is, one phase belt is 60°. The three-phase winding thus sequentially includes phase belts: W-, V+, U-, W+, V-, U+. The windings or conductors of phase W are distributed in W- and W+; the windings or conductors of phase V are distributed in V- and V+; the windings or conductors of phase U are distributed in U- and U+.

[0040] As shown in Figure 7 , Figure 8 and Figure 9 for the first pole pair, slots 1, 2, and 3 are allocated to the W- phase belt; slots 4, 5, and 6 are allocated to the V+ phase belt; slots 7, 8, and 9 are allocated to the U- phase belt; slots 10, 11, and 12 are allocated to the W+ phase belt; slots 13, 14, and 15 are allocated to the V- phase belt; slots 16, 17, and 18 are allocated to the U+ phase belt.

[0041] For the second pole pair, slots 19, 20, and 21 are allocated to the W- phase belt; slots 22, 23, and 24 are allocated to the V+ phase belt; slots 25, 26, and 27 are allocated to the U- phase belt; slots 28, 29, and 30 are allocated to the W+ phase belt; slots 31, 32, and 33 are allocated to the V- phase belt; slots 34, 35, and 36 are allocated to the U+ phase belt.

[0042] For the third pole pair, slots 37, 38, and 39 are allocated to the W- phase belt; slots 40, 41, and 42 are allocated to the V+ phase belt; slots 43, 44, and 45 are allocated to the U- phase belt; slots 46, 47, and 48 are allocated to the W+ phase belt; slots 49, 50, and 5l are allocated to the V- phase belt; slots 52, 53, and 54 are allocated to the U+ phase belt.

[0043] Conductors are arranged in all the slots, and the conductors of the same phase (phase W or phase V or phase U) are sequentially connected in series to form a phase winding.

[0044] In an embodiment of the present disclosure, the conductor is configured as a hairpin-shaped conductor. Three hairpin-shaped conductors in three slots assigned to each pole and each phase form a pole-phase group. Therefore, each pole-phase group in the first-layer winding, the second-layer winding, and the third-layer winding includes first, second, and third short-pitch hairpin-shaped conductors. Taking Figure 7 the first-phase winding of the W phase as an example, in the first-layer winding occupying layers 1 and 2, a pole-phase group includes three hairpin-shaped conductors (abbreviated as PINs). For example, the first PIN straddles slots 1 and 10, the second PIN straddles slots 2 and 11, and the third PIN straddles slots 3 and 12. The pitch of these three short-pitch hairpin-shaped conductors is 9 and they have a clockwise inclination direction.

[0045] The pole-phase group between the first-layer winding and the second-layer winding includes first, second, and third short-pitch hairpin-shaped conductors. Taking Figure 7 the first-phase winding of the W phase as an example, between the first-layer winding occupying layers 1 and 2 and the second-layer winding occupying layers 3 and 4, a pole-phase group includes three hairpin-shaped conductors (abbreviated as PINs). These three PINs span from layer 3 to layer 2, and the first PIN straddles slots 19 and 28, the second PIN straddles slots 20 and 29, and the third PIN straddles slots 21 and 30. The pitch of these three short-pitch hairpin-shaped conductors is 9 and they have a counterclockwise inclination direction.

[0046] As can be seen from 7, whether it is the short-pitch hairpin-shaped conductors in the layer winding or the short-pitch hairpin-shaped conductors between the layer windings, the pitch is 9. Therefore, the first short-pitch hairpin-shaped conductors in each pole-phase group are connected in series and form a first series circuit; the second short-pitch hairpin-shaped conductors in each pole-phase group are connected in series and form a second series circuit; the third short-pitch hairpin-shaped conductors in each pole-phase group are connected in series and form a third series circuit.

[0047] In order to connect the above first series circuit, second series circuit, and third series circuit in series, the first, second, and third long-pitch hairpin-shaped conductors in the pole-phase group between the first-layer winding and the third-layer winding adopt long pitch and short pitch. Taking Figure 7 the first-phase winding of the W phase as an example, between the first-layer winding occupying layers 1 and 2 and the third-layer winding occupying layers 5 and 6, a pole-phase group includes three hairpin-shaped conductors (abbreviated as PINs). These three PINs span from layer 1 to layer 6, and the first PIN straddles slots 19 and 30 with a pitch of 11 (long pitch), the second PIN straddles slots 20 and 28 with a pitch of 8 (short pitch), and the third PIN straddles slots 21 and 29 with a pitch of 8 (short pitch). The first PIN connects the first series circuit and the third series circuit, the second PIN connects the second series circuit and the first series circuit, and the third PIN connects the third series circuit and the second series circuit.

[0048] In the case where a phase winding has three layer windings and the number of slots per pole per phase is 3 (including three conductors in a pole-phase group), if such long-span hairpin-shaped conductors with long pitch and short pitch according to the present disclosure are not used, but ordinary short-span hairpin-shaped conductors are adopted, the welding ends of two hairpin-shaped conductors cannot be close to each other and cannot be aligned against each other. In order to connect the welding ends of these two hairpin-shaped conductors, additional conductors are required to bridge across. This increases additional processes on the one hand and results in non-neatly arranged welding ends on the other hand.

[0049] In Figure 7 、 Figure 8 and Figure 9 In the embodiments shown in

[0050] In an embodiment according to the present disclosure, the stator winding includes three forms of hairpin-shaped conductors, namely short-span hairpin-shaped conductors, long-span hairpin-shaped conductors with short pitch, and long-span hairpin-shaped conductors with long pitch. Specifically classified according to the number of spanned slots and the number of layers, the 162 hairpin-shaped conductors in the stator coil according to the present disclosure include the following types of hairpin-shaped conductors (PIN).

[0051] Type of PIN (layer-layer-pitch) Number of PINs 1-2-9 (short span, full pitch, within layer) 36 3-4-9 (short span, full pitch, within layer) 36 5-6-9 (short span, full pitch, within layer) 36 3-2-9 (short span, full pitch, between layers) 18 5-4-9 (short span, full pitch, between layers) 18 1-6-8 (long span, short pitch, between layers) 12 1-6-11 (long span, long pitch, between layers) 6

[0052] The stator winding according to the present disclosure adopts fewer types of hairpin-shaped conductors, which simplifies the manufacturing and processing process of the hairpin-shaped conductors.

[0053] In an embodiment according to the present disclosure, the first-phase windings of the W, V, and U phases may, for example, have a winding inlet end and a winding outlet end, and the second-phase windings of the W, V, and U phases may, for example, have a winding inlet end and a winding outlet end. The winding inlet end is connected to one of the outermost first conductor legs, and the winding outlet end is connected to the other outermost second conductor leg. In Figure 7 、 Figure 8 and Figure 9In the illustrated embodiment, the inward arrow indicates the winding inlet end, and the outward arrow indicates the winding outlet end. In this embodiment, one of the winding inlet end and the winding outlet end is respectively arranged at one welding end of the long-span hairpin-shaped conductor (1-6-11) with a long pitch. The other of the winding inlet end and the winding outlet end is respectively arranged at one end of the short-span hairpin-shaped conductor (1-2-9) adjacent to the long-span hairpin-shaped conductor (1-6-11) with a long pitch. In other words, the welding between the long-span hairpin-shaped conductor (1-6-11) with a long pitch and the adjacent short-span hairpin-shaped conductor (1-2-9) is cancelled, and the two welding ends are respectively used as the winding inlet end and the winding outlet end of the corresponding winding.

[0054] According to another aspect of the present disclosure, a motor is provided, which includes the motor stator as described above.

[0055] According to another aspect of the present disclosure, a drive system is provided, which includes the motor as described above.

[0056] According to another aspect of the present disclosure, a vehicle is provided, which includes the drive system as described above. The vehicle may be an electrified vehicle, such as a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a range extended electric vehicle, or a fuel cell electric vehicle (FCEV). The vehicle may also be a hydrogen energy vehicle. Based on the above, the vehicle can achieve the functions of the electric excitation synchronous motor 1 as described above and has the advantages as described above.

[0057] In this disclosure, unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar terms used in the specification and claims of this patent application for this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not necessarily denote a quantity limitation. Terms such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0058] The exemplary embodiments of the solution proposed in this disclosure have been described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of this disclosure, various modifications and variations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed in this disclosure can be made, without exceeding the protection scope of this disclosure. The protection scope of this disclosure is determined by the appended claims.

Claims

1. A motor stator, comprising: A stator core, wherein the stator core is constructed as a hollow cylinder and is provided with a plurality of slots along a circumferential direction; as well as A stator coil comprising three first-phase windings, each first-phase winding comprising a plurality of layer windings, the plurality of layer windings being connected in series, and each first-phase winding comprising a plurality of hairpin-shaped conductors connected in series, wherein the hairpin-shaped conductors respectively have a first conductor leg and a second conductor leg and a non-welded end connected therebetween, the first conductor leg and the second conductor leg being respectively arranged in different slots, each slot being arranged with a plurality of layers of conductor legs, the end of the first conductor leg having an inlet section, the end of the second conductor leg having an outlet section, the inlet section and the outlet section extending out of the slot; The hairpin conductor includes a short-span hairpin conductor and a long-span hairpin conductor, wherein the first conductor leg and the second conductor leg of the short-span hairpin conductor are respectively arranged in two adjacent layers, and the first conductor leg and the second conductor leg of the long-span hairpin conductor are respectively arranged in the innermost layer and the outermost layer; The welding end of the outgoing wire section of each hairpin conductor and the welding end of the incoming wire section of another adjacent hairpin conductor in the same first phase winding are aligned with each other in the radial direction.

2. The motor stator according to claim 1, wherein: The pitch of the short-span hairpin-shaped conductor is a full pitch, and the pitch of the long-span hairpin-shaped conductor is a short pitch or a long pitch.

3. The motor stator according to claim 1, wherein: The number of slots per pole and per phase of the motor stator is 3.

4. The motor stator according to claim 1, wherein: The number of layers of the conductor legs is 2(N+2), where N is a positive integer.

5. The motor stator according to claim 1, wherein: The number of layers of the conductor legs is 6; Each first phase winding includes a first layer winding, a second layer winding, and a third layer winding, wherein the first layer winding is arranged in the first and second layers, the second layer winding is arranged in the third and fourth layers, and the third layer winding is arranged in the fifth and sixth layers; A short-span hairpin conductor is arranged in the first layer of winding, the second layer of winding and the third layer of winding, wherein the short-span hairpin conductor has a clockwise tilt direction; The long-span hairpin conductor is arranged between the first layer of windings and the third layer of windings, and the long-span hairpin conductor has the clockwise tilt direction; The short-span hairpin conductor is arranged between the first layer of winding and the second layer of winding, and the short-span hairpin conductor has a counterclockwise tilt direction. The short-span hairpin conductor is arranged between the second layer of winding and the third layer of winding, and the short-span hairpin conductor has a counterclockwise tilt direction.

6. The motor stator according to claim 5, wherein: The number of slots in the motor stator is 54, the pole pitch is 9, and the number of slots per pole and per phase is 3; Each pole phase group in the first layer winding, the second layer winding and the third layer winding includes a first, a second and a third short span hairpin conductor, the three short span hairpin conductors have a pitch of 9 and have the clockwise tilt direction; A pole phase group between the first layer of windings and the second layer of windings comprises first, second and third short span hairpin conductors, wherein the three short span hairpin conductors have a pitch of 9 and have the counterclockwise tilt direction; wherein the first short-span hairpin-shaped conductors are connected in series to form a first series circuit, the second short-span hairpin-shaped conductors are connected in series to form a second series circuit, and the third short-span hairpin-shaped conductors are connected in series to form a third series circuit; The pole phase group between the first layer of windings and the third layer of windings includes first, second and third long span hairpin conductors, the three long span hairpin conductors have the clockwise tilt direction, the pitch of the first long span hairpin conductor is 11, and the first series circuit is connected to the third series circuit, the pitch of the second long span hairpin conductor is 8, and the second series circuit is connected to the first series circuit, and the pitch of the third long span hairpin conductor is 8, and the third series circuit is connected to the second series circuit.

7. The motor stator according to claim 1 or 5, wherein: The stator coil also includes three second-phase windings, which have the same structure as the first-phase winding. The arrangement of the hairpin conductors in the second-phase windings is offset by a pole pitch relative to the arrangement of the hairpin conductors in the first-phase windings. The first-phase windings are connected in parallel with the second-phase windings.

8. The motor stator according to claim 1, wherein: Each first phase winding has a winding inlet end and a winding outlet end. The winding inlet end is connected to one of the first conductor legs of the outermost layer, and the winding outlet end is connected to the other second conductor leg of the outermost layer.

9. An electric motor comprising the electric motor stator according to any one of claims 1 to 8.

10. A transmission system comprising the motor according to claim 9.

11. A vehicle comprising the transmission system according to claim 10.

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