Electric machine stator, electric machine, electric drive assembly system and vehicle

Abstract

This disclosure relates to an electric motor stator comprising three phase windings, each phase winding comprising a first winding group and a second winding group configured in multiple layers. The first and second winding groups each have multiple adjacent sub-winding groups arranged side-by-side, each sub-winding group being formed by series connection of shaped conductors corresponding to the same phase. In the outermost and / or innermost layer, the shaped conductors at the ends of the sub-winding groups in the first winding group are connected to the shaped conductors at the ends of the sub-winding groups in the second winding group, such that a portion of the sub-winding groups in the first winding group and a portion of the sub-winding groups in the second winding group form a first branch, and another portion of the sub-winding groups in the first winding group and another portion of the sub-winding groups in the second winding group are connected in series to form a second branch. This disclosure also relates to an electric motor including the electric motor stator, an electric drive assembly system including the electric motor, and a vehicle including the drive system.

Description

Technical Field

[0001] This disclosure relates to an electric motor stator, an electric motor including the electric motor stator, an electric drive assembly system including the electric motor, and a vehicle including the drive system. Background Technology

[0002] The stator of an AC motor is typically composed of a laminated iron core and stator coils. A periodically changing alternating current is passed through the stator coils, thereby exciting a continuously rotating air gap magnetic field at the same frequency. The rotating air gap magnetic field drives the rotor of the AC motor to rotate; this AC motor can be either an asynchronous motor or a synchronous motor.

[0003] To improve the performance of AC motors, flat wires are increasingly being used in the stator coils of AC motors. Compared to round wires, flat wires are beneficial for increasing the slot fill factor of the motor and can therefore generate a stronger magnetic field, thereby increasing power density. Summary of the Invention

[0004] This disclosure provides an electric motor stator. The stator coils of this electric motor stator are composed of flat wires, particularly shaped conductors, such as hair-pin or X-pin. The electric motor stator according to this disclosure uses only one type of shaped conductor, and the non-welded ends of each shaped conductor have the same bending shape, and the non-welded ends of the stator windings have a neat and equal-height arrangement.

[0005] This disclosure provides a motor stator, comprising: a stator core constructed as a hollow cylinder, the stator core having multiple slots along its circumference; and a stator coil comprising three phase windings, each phase winding comprising a first winding group and a second winding group constructed as multiple layers, the first winding group and the second winding group each having multiple adjacent sub-winding groups arranged side by side, the sub-winding groups being formed by shaped conductors corresponding to the same phase connected in series; wherein, on the outermost and / or innermost layer, the shaped conductors at the ends of the sub-winding groups in the first winding group are connected to the shaped conductors at the ends of the sub-winding groups in the second winding group, such that a portion of the sub-winding groups in the first winding group and a portion of the sub-winding groups in the second winding group form a first branch, and another portion of the sub-winding groups in the first winding group and another portion of the sub-winding groups in the second winding group are connected in series to form a second branch.

[0006] In embodiments according to this disclosure, the pitch of the shaped conductor is a whole pitch.

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

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

[0009] In an embodiment according to this disclosure, the motor stator has 54 slots, a pole pitch of 9, and 3 slots per pole per phase; the first winding group and the second winding group respectively include a first sub-winding group, a second sub-winding group, and a third sub-winding group, wherein the first sub-winding group is formed by a first shaped conductor connected in series, the second sub-winding group is formed by a second shaped conductor connected in series, and the third sub-winding group is formed by a third shaped conductor connected in series, wherein the pitch of the first, second, and third shaped conductors is 9;

[0010] On the outermost layer, the end of the first shaped conductor of the first winding group is connected to the end of the third shaped conductor of the second winding group. On the innermost layer, the end of the second shaped conductor of the second winding group is connected to the end of the first shaped conductor of the first winding group, such that the second sub-winding group, the third sub-winding group of the second winding group, and the first sub-winding group of the first winding group form the first branch. On the outermost layer, the end of the third shaped conductor of the first winding group is connected to the end of the first shaped conductor of the second winding group. On the innermost layer, the end of the second shaped conductor of the first winding group is connected to the end of the first shaped conductor of the second winding group, such that the second sub-winding group, the third sub-winding group, and the first sub-winding group of the second winding group form the second branch.

[0011] In an embodiment according to this disclosure, the shaped conductor has 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 are respectively arranged in two adjacent layers and in different slots, each slot having multiple layers of conductor legs. The end of the first conductor leg has a first segment, the end of which is configured as a first welded end. The end of the second conductor leg has a second segment, the first segment and the second segment extending out of the slot. The end of the second segment is configured as a second welded end.

[0012] In an embodiment according to this disclosure, the conductor leg has six layers, wherein the first layer is the outermost layer and the sixth layer is the innermost layer; the first winding group and the second winding group respectively include 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; the shaped conductor is arranged in the first layer winding, the second layer winding, and the third layer winding; in the first layer winding, the second layer winding, and the third layer winding, the second welding end of the innermost layer abuts against the first welding end of the outermost layer; in the first layer... Between the winding and the second layer winding, and between the second layer winding and the third layer winding, the first weld end of the innermost layer abuts against the second weld end of the outermost layer; and on the outermost layer, the first weld end of the third shaped conductor of the second winding group is connected to the first weld end of the first shaped conductor of the first winding group, and the first weld end of the third shaped conductor of the first winding group is connected to the first weld end of the first shaped conductor of the second winding group; on the innermost layer, the second weld end of the second shaped conductor of the second winding group is connected to the second weld end of the first shaped conductor of the first winding group, and the second weld end of the second shaped conductor of the first winding group is connected to the second weld end of the first shaped conductor of the second winding group.

[0013] In embodiments according to this disclosure, the first branch and the second branch are connected in parallel.

[0014] In embodiments according to this disclosure, the first branch and the second branch each have a branch start end and a branch end end, which are located in the innermost layer and the outermost layer, respectively.

[0015] In embodiments according to this disclosure, the shaped conductor is a Hair-PIN or an X-PIN.

[0016] This disclosure also provides an electric motor, the electric motor including a motor stator according to the above embodiments of this disclosure.

[0017] This disclosure also provides an electric drive assembly system, which includes a motor according to the above embodiments of this disclosure.

[0018] This disclosure also provides a vehicle that includes an electric drive system according to the above embodiments of this disclosure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 A schematic diagram of the structure of a motor stator according to an embodiment of the present disclosure is shown.

[0021] Figure 2 A schematic diagram of the non-welded end side of the stator coil according to an embodiment of the present disclosure is shown.

[0022] Figure 3 A schematic diagram of the welded end side of the stator coil according to an embodiment of the present disclosure is shown.

[0023] Figure 4 A schematic diagram showing another angle of the stator coil's welded end side according to an embodiment of the present disclosure is shown.

[0024] Figure 5 A schematic diagram of a first type of molded conductor according to an embodiment of the present disclosure is shown.

[0025] Figure 6 A schematic diagram of a second type of molded conductor according to an embodiment of the present disclosure is shown.

[0026] Figure 7 A winding diagram of the U-phase winding of the stator coil according to an embodiment of the present disclosure is shown.

[0027] Figure 8 A winding diagram of the V-phase winding of the stator coil according to an embodiment of the present disclosure is shown, and

[0028] Figure 9 A winding diagram of the W-phase winding of the stator coil according to an embodiment of the present disclosure is shown. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0030] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, 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.

[0031] Figure 1 A schematic diagram of a motor stator 100 according to an embodiment of the present disclosure is shown. 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, for example, formed by stacking silicon steel sheets. A plurality of slots 101 are arranged along the circumferential direction of the stator core 110. Figure 1 In the illustrated embodiment, the stator core 110 has 54 slots 101. In embodiments according to this disclosure, insulating elements 102, such as insulating paper, may also be disposed in the slots 101.

[0032] Stator coils 120 are arranged in slots 101 of the stator core 110. In embodiments of a 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. In the case of multiple branches, the multiple branches are connected in parallel.

[0033] In embodiments according to this disclosure, a phase winding may, for example, have multiple layers; that is, a phase winding may include multiple layer windings connected in series. Figure 1 In the illustrated embodiment, a phase winding consists of three layer windings. These three layer windings form three concentric loops. Accordingly, multiple conductor legs need to be arranged in a slot 101, the number of conductor legs being equal to the number of layer windings multiplied by 2. Figure 1 In the embodiment shown, six layers of conductor legs are arranged in a slot 101.

[0034] Each phase winding consists of multiple shaped conductors 121 connected in series. In this disclosure, the shaped conductors 121 include a first type of shaped conductor 500, the specific structure of which is described in... Figure 5 As shown, the second type of shaped conductor 600 has a specific structure in Figure 6 As shown in the diagram. The molded conductor according to this disclosure can be, for example, a hair-pin, an X-pin, or other molded conductors known in the art. The connection relationships of the molded conductor 121 will be described in detail later. Figure 1 In the middle, the lower end of the stator coil 120 is the non-welded end side of the stator coil 120, that is, the crown end side 140. This is in Figure 2 This will be shown in detail later. Figure 1In the middle, the upper end of the stator coil 120 is the welding end side 130 of the stator coil 120, which is in Figure 3 and Figure 4 The details will be shown in the middle.

[0035] In this disclosure, the molded conductor 121 includes a first molded conductor 500, the specific structure of which is as follows: Figure 5 As shown, the second type of shaped conductor 600 has a specific structure in Figure 6 As shown in the image.

[0036] The first type of molded conductor 500 has a first conductor leg 501, a second conductor leg 502, and a non-welded end 507 connected therebetween. The first conductor leg 501 and the second conductor leg 502 are respectively arranged in different slots 101. The end of the first conductor leg 501 has a first segment 503, and the end of the second conductor leg 502 has a second segment 504. The first segment 503 and the second segment 504 extend out of the slot 101. The first segment 503 of the first type of molded conductor 500 is bent relative to the first conductor leg 501, for example, bent in a counterclockwise direction, so as to approach and abut against the second segment 504 of the second type of molded conductor 500. The second segment 504 of the second type of molded conductor 500 is bent relative to the second conductor leg 502, for example, bent in a clockwise direction, so as to approach and abut against the first segment 503 of the first type of molded conductor 500. A first welding end 505 is formed at the end of the first segment 503, and a second welding end 506 is formed at the end of the second segment 504. The first welding end 505 of the first type of shaped conductor 500 and the second welding end 506 of the second type of shaped conductor 500 are welded together.

[0037] The second type of shaped conductor 600 has a first conductor leg 601, a second conductor leg 602, and a non-welded end 607 connected therebetween. The first conductor leg 601 and the second conductor leg 602 are respectively arranged in different grooves 101. The end of the first conductor leg 601 has a first segment 603, and the end of the second conductor leg 602 has a second segment 604. The first segment 603 and the second segment 604 extend out of the groove 101. A first welded end 605 is formed at the end of the first segment 603, and a second welded end 606 is formed at the end of the second segment 604.

[0038] The second-type molded conductor 600 and the first-type molded conductor 500 have the same span and the same type of non-welded end; their only difference lies in the bending direction of the first and second segments extending from the groove. The first segment 603 and the second segment 604 of the second-type molded conductor 600 have the same bending direction, for example, both are bent clockwise. The first segment 603 and its first welded end 605 of the second-type molded conductor 600 are used to connect with the second segment 504 and its first welded end 506 of the adjacent first-type molded conductor 500; the second segment 604 and its second welded end 606 of the second-type molded conductor 600 are used to connect with the first segment 503 and its second welded end 506 of another adjacent first-type molded conductor 500.

[0039] The first type of shaped conductor 500 and the second type of shaped conductor 600 are connected sequentially in the manner described above to form a phase winding or one branch of a phase winding. The phase winding formed by the first type of shaped conductor 500 and the second type of shaped conductor 600, and the branch of the phase winding, will be discussed later. Figure 7 , Figure 8 and Figure 9 It is shown in detail in the middle.

[0040] Figure 2 A schematic diagram of the non-welded end side 140 of the stator coil 120 according to an embodiment of the present disclosure is shown. Figure 2 As shown, all the molded conductors 121 have the same pitch, where pitch refers to the number of slots occupied between the two conductor legs of a molded conductor. The first conductor legs 501 and the second conductor legs 502 of all the molded conductors 121 are arranged in adjacent layers, respectively. Therefore, the non-welded end side 140 of the stator coil 120 of this embodiment of the present disclosure has a neat arrangement. This means that the non-welded ends 507 of all the molded conductors 121 can be bent in the same way, and the non-welded ends 507 of the molded conductors 121 in the same layer of winding have exactly the same bend.

[0041] In embodiments according to this disclosure, the pitch of all the formed conductors 121 can be, for example, a short pitch. When the pitch is equal to the pole pitch, the pitch of the formed conductor is called the full pitch; when the pitch is less than the pole pitch, the pitch of the formed conductor is called the short pitch; and when the pitch is greater than the pole pitch, the pitch of the formed conductor is called the long pitch. 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.

[0042] Figure 3 A schematic diagram of the welded end side 130 of the stator coil 120 according to an embodiment of the present disclosure is shown. Figure 3 The second type of shaped conductor 600 located in the outermost layer is marked in the diagram. Figure 4A schematic diagram showing another angle of the weld end side 130 of the stator coil 120 according to an embodiment of the present disclosure is shown. Figure 4 The second type of shaped conductor 600, located in the innermost layer, is marked in the diagram. Besides... Figure 3 and 4 The second type of molded conductor 600 is marked in the diagram, while the other molded conductors in the stator coil 120 are the first type of molded conductor 500. The welding ends of the first type of molded conductor 500 and the adjacent first type of molded conductor 500 or second type of molded conductor 600 are aligned and abutted against each other in the radial direction. This makes the welding operation between the welding ends very easy.

[0043] In the existing technology, especially when there are multiple windings in the phase winding, there are some weld ends that cannot be aligned with each other. In order to connect such weld ends, an additional conductor is usually required to bridge the two weld ends, which increases the complexity of the welding operation.

[0044] exist Figure 7 , Figure 8 and Figure 9 In the illustrated embodiment, the stator coil includes three phase windings: a U-phase winding, a V-phase winding, and a W-phase winding. Each phase winding has two branches: a first branch and a second branch, which can be connected in parallel. For example, the ends of the first and second branches with the same arrow direction in the illustration can be connected to each other.

[0045] To more clearly illustrate how the first type of shaped conductor 500 and the second type of shaped conductor 600 are connected to form the phase winding and the stator coil 120, Figure 7 , Figure 8 and Figure 9 A winding diagram of a stator coil according to an embodiment of the present disclosure is shown. Figure 7 , Figure 8 and Figure 9 In the illustrated embodiment, the stator coil includes three phase windings: a U-phase winding, a V-phase winding, and a W-phase winding. Each phase winding has two branches: a first branch and a second branch, which are connected in parallel. The stator core has 54 slots. Figure 7 , Figure 8 and Figure 9 In the diagram, 54 slots are labeled 1, 2, 3...54. Each slot contains 6 conductor legs, meaning a slot can be divided into 6 layers, labeled 1, 2, 3, 4, 5, and 6 respectively. In embodiments according to this disclosure, the number of stator slot layers can also be, for example, 2(N+2), where N is a positive integer. That is, the number of stator slot layers can be 6, 8, 10,...

[0046] exist Figure 7 , Figure 8 and Figure 9 In the diagram, small squares represent conductor legs extending axially, and solid lines represent the distance traversed by the unwelded end of a shaped conductor. The number of layers and slots traversed to the unwelded end of a shaped conductor is clearly visible in the winding diagram. Dashed lines represent connections between two shaped conductors. One type of dashed line connects two conductor legs located in the same layer, i.e., two conductor legs in the first layer (e.g., the outermost layer) and two conductor legs in the sixth layer (e.g., the innermost layer). Another type of dashed line connects two conductor legs in adjacent layers. In the following description, the half of the dashed line to the left of a solid line is defined as the first segment and its first welded end, and the half of the dashed line to the right is defined as the second segment and its second welded end.

[0047] like Figure 7 , Figure 8 and Figure 9 As shown, in embodiments according to this disclosure, the shaped conductors (including a first shaped conductor 500 and a second shaped conductor 600) have identical spans, i.e., spanning the same number of layers (2 layers) and the same number of slots (9 slots). Therefore, the non-welded ends, i.e., the crown ends, of the stator coils 120 can have the same bending form and degree of bending, and thus can be arranged very neatly, with the crown ends of the individual shaped conductors at the same height. Consequently, the braiding process of the stator coils is greatly simplified, and the braided stator coils can be easily pressed into the stator yoke, for example, by pressing with a flat plate. This simplifies the assembly process, eliminating the need for press-in equipment with complex or custom shapes.

[0048] Each phase winding includes three layers of windings: a first layer, a second layer, and a third layer. The first layer is arranged in the first and second layers, the second layer is arranged in the third and fourth layers, and the third layer is arranged in the fifth and sixth layers. As can be seen from the winding diagram, the shaped conductors are arranged in the first, second, and third layers of windings.

[0049] In embodiments according to this disclosure, a first layer is defined as the outermost layer, and a sixth layer is defined as the innermost layer. In the first, second, and third layer windings, the second solder end of the innermost layer abuts against the first solder end of the outermost layer. Between the first and second layer windings, and between the second and third layer windings, the first solder end of the innermost layer abuts against the second solder end of the outermost layer; and

[0050] In embodiments according to this disclosure, the stator coil 120 includes a U-phase winding, a V-phase winding, and a W-phase winding. Each phase winding includes a first winding group 710, 810, 910 and a second winding group 720, 820, 920, which are configured as multiple layers. The first winding group 710, 810, 910 and the second winding group 720, 820, 920 are each three adjacent sub-winding groups arranged side by side. Each sub-winding group is formed by connecting shaped conductors corresponding to the same phase in series.

[0051] In embodiments according to this disclosure, on the first layer (outermost layer) and the sixth layer (innermost layer), the shaped conductors at the ends of the sub-winding groups of the first winding group 710, 810, and 910 are connected to the shaped conductors at the ends of the sub-winding groups of the second winding group 720, 820, and 920, such that a portion of the sub-winding groups of the first winding group 710, 810, and 910 and a portion of the sub-winding groups of the second winding group 720, 820, and 920 form a first branch, and another portion of the sub-winding groups of the first winding group 710, 810, and 910 and another portion of the sub-winding groups of the second winding group 720, 820, and 920 are connected in series to form a second branch.

[0052] The following is based on Figure 7 , Figure 8 and Figure 9 The illustrated embodiment serves as an example to illustrate the arrangement of the first winding groups 710, 810, and 910, the second winding groups 720, 820, and 920, the first branch, and the second branch, as well as their connections. In this embodiment, the number of phases of the motor is m = 3, the number of stator slots is Z = 54, the number of pole pairs is p = 3 (including the first, second, and third pole pairs), and the number of poles of the rotor is 2*p = 6. First, the stator slots are allocated to each phase and each pole, i.e., the number of slots per pole per phase is determined as q = Z / (2p*m) = 3. The electrical angle range of one pole is 180°. For a three-phase winding, each phase occupies an electrical angle of 60°, i.e., one phase band is 60°. The three-phase winding therefore includes phase bands in sequence: U+, W-, V+, U-, W+, V-. The windings or conductors of phase U are distributed in phase bands U- and U+, the windings or conductors of phase V are distributed in phase bands V- and V+, and the windings or conductors of phase W are distributed in phase bands W- and W+.

[0053] like Figure 7 , Figure 8 and Figure 9 As shown, for the first pole pair, slots 1, 2, and 3 are assigned to the U+ phase band; slots 4, 5, and 6 are assigned to the W- phase band; slots 7, 8, and 9 are assigned to the V+ phase band; slots 10, 11, and 12 are assigned to the U- phase band; slots 13, 14, and 15 are assigned to the W+ phase band; and slots 16, 17, and 18 are assigned to the V- phase band.

[0054] For the second pole pair, slots 19, 20, and 21 were assigned to the U+ phase band; slots 22, 23, and 24 were assigned to the W- phase band; slots 25, 26, and 27 were assigned to the V+ phase band; slots 28, 29, and 30 were assigned to the U- phase band; slots 31, 32, and 33 were assigned to the W+ phase band; and slots 34, 35, and 36 were assigned to the V- phase band.

[0055] For the third pole pair, slots 37, 38, and 39 were assigned to the U+ phase band; slots 40, 41, and 42 were assigned to the W- phase band; slots 43, 44, and 45 were assigned to the V+ phase band; slots 46, 47, and 48 were assigned to the U- phase band; slots 49, 50, and 51 were assigned to the W+ phase band; and slots 52, 53, and 54 were assigned to the V- phase band.

[0056] The three shaped conductors assigned to the three slots of each pole and each phase constitute a pole phase group. Therefore, each pole phase group in the first, second, and third layers of windings includes a first shaped conductor PIN1, a second shaped conductor PIN2, and a third shaped conductor PIN3, respectively. Figure 7 Taking one pole group in the first phase winding of the U-phase as an example, the first shaped conductor PIN1 crosses from slot 1 of the first layer to slot 10 of the second layer, the second shaped conductor PIN2 crosses from slot 2 of the first layer to slot 11 of the second layer, and the third shaped conductor PIN3 crosses from slot 3 of the first layer to slot 12 of the second layer. The shaped conductors in other pole groups have the same arrangement.

[0057] exist Figure 7 In the first winding group 710, there are sub-winding groups 711, 712, and 713. The second winding group 720 includes sub-winding groups 721, 722, and 723.

[0058] exist Figure 8 In the first winding group 810, there are sub-winding groups 811, 812, and 813. The second winding group 820 includes sub-winding groups 821, 822, and 823.

[0059] exist Figure 9 In the first winding group 910, there are sub-winding groups 911, 912, and 913. The second winding group 920 includes sub-winding groups 921, 922, and 923.

[0060] Since the arrangement of each phase winding is the same, the following explanation will only use the U-phase winding as an example. The V-phase winding and W-phase winding can be arranged in a similar manner.

[0061] For phase U, the first winding group 710 includes a first sub-winding group 711, which is formed by connecting the first shaped conductor PIN1 in series and extends from the first layer to the sixth layer; a second sub-winding group 712, which is formed by connecting the second shaped conductor PIN2 in series and extends from the first layer to the sixth layer; and a third sub-winding group 713, which is formed by connecting the third shaped conductor PIN3 in series and extends from the first layer to the sixth layer.

[0062] The second winding group 720 includes a first sub-winding group 721, which is formed by a first shaped conductor PIN1 connected in series and extends from the first layer to the sixth layer; a second sub-winding group 722, which is formed by a second shaped conductor PIN2 connected in series and extends from the first layer to the sixth layer; and a third sub-winding group 723, which is formed by a third shaped conductor PIN3 connected in series and extends from the first layer to the sixth layer.

[0063] On the first layer, the end of the third molded conductor PIN3 of the second winding group 720 (i.e., the first solder end) is connected to the end of the first molded conductor PIN1 of the first winding group 710 (i.e., the first solder end) between slots 30 and 37; on the sixth layer, the end of the second molded conductor PIN2 of the second winding group 720 (i.e., the second solder end) is connected to the end of the first molded conductor PIN1 of the first winding group 710 (i.e., the second solder end) between slots 20 and 28, such that the second sub-winding group 722 and the third sub-winding group 723 of the second winding group 720 and the first sub-winding group 711 of the first winding group 710 form a first branch, and

[0064] On the first layer, the end of the third molded conductor PIN3 of the first winding group 710 (i.e., the first solder end) is connected to the end of the first molded conductor PIN1 of the second winding group (i.e., the first solder end) between slots 39 and 46; on the sixth layer, the end of the second molded conductor PIN2 of the first winding group 710 (i.e., the second solder end) is connected to the end of the first molded conductor PIN1 of the second winding group (i.e., the second solder end) between slots 29 and 37, so that the second sub-winding group 712 and the third sub-winding group 713 of the first winding group 710 and the first sub-winding group 721 of the second winding group 720 form a second branch.

[0065] For phase U, the third shaped conductor PIN3 corresponding to slots 30 and 39 in the first layer is constructed as follows: Figure 6 The second type of molded conductor 600 is shown. The first molded conductor PIN1, corresponding to the slots 28 and 37 of the sixth layer, is constructed as follows: Figure 6 The second type of shaped conductor 600 shown in the figure.

[0066] In embodiments according to this disclosure, the second type of shaped conductor 600 and the first type of shaped conductor 500 have the same span and the same type of unwelded end, differing only in the bending direction of the first and second sections extending from the slot. All shaped conductors are arranged between adjacent layers of the layer winding, with a pitch of 9 (full pitch). Specifically classified according to the number of slots and layers spanned, the 162 shaped conductors in the stator coil according to this disclosure include the following types of shaped conductors (PINs).

[0067] PIN type (layer-layer-pitch) Number of PINs 1-2-9 54 3-4-9 54 5-6-9 54

[0068] When braiding the stator winding according to this disclosure, only one type of shaped conductor is required. These shaped conductors differ only in size according to their position along the radial direction of the stator winding. This minimizes the variety of shaped conductors that need to be manufactured or processed, and simplifies the manufacturing and processing of shaped conductors to the greatest extent.

[0069] According to another aspect of this disclosure, an electric motor is proposed, which includes an electric motor stator as described above.

[0070] According to another aspect of this disclosure, an electric drive assembly system is proposed, which includes the motor as described above.

[0071] According to another aspect of this disclosure, a vehicle is proposed that includes the electric drive powertrain system as described above. The vehicle can 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 (REEV), or a fuel cell electric vehicle (FCEV). The vehicle can also be a hydrogen fuel cell vehicle.

[0072] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0073] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A motor stator, comprising: The stator core is constructed as a hollow cylinder and has multiple slots along its circumference. as well as The stator coil includes three phase windings, each phase winding including a first winding group and a second winding group constructed as multiple layers, the first winding group and the second winding group each having multiple adjacent side-by-side sub-winding groups, the sub-winding groups being formed by shaped conductors corresponding to the same phase connected in series. In this configuration, on the outermost and / or innermost layer, the shaped conductors at the ends of the sub-winding groups in the first winding group are connected to the shaped conductors at the ends of the sub-winding groups in the second winding group, such that a portion of the sub-winding groups in the first winding group and a portion of the sub-winding groups in the second winding group form a first branch, and another portion of the sub-winding groups in the first winding group and another portion of the sub-winding groups in the second winding group are connected in series to form a second branch.

2. The motor stator of claim 1, wherein, The pitch of the shaped conductor is a whole pitch.

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

4. The motor stator of claim 1, wherein, The conductor leg has 2(N+2) layers, where N is a positive integer.

5. The motor stator according to claim 1, wherein, The motor stator has 54 slots, a pole pitch of 9, and 3 slots per pole per phase; The first winding group and the second winding group respectively include a first sub-winding group, a second sub-winding group and a third sub-winding group. The first sub-winding group is formed by a first shaped conductor connected in series, the second sub-winding group is formed by a second shaped conductor connected in series, and the third sub-winding group is formed by a third shaped conductor connected in series. The pitch of the first, second and third shaped conductors is 9. On the outermost layer, the end of the first shaped conductor of the first winding group is connected to the end of the third shaped conductor of the second winding group; on the innermost layer, the end of the second shaped conductor of the second winding group is connected to the end of the first shaped conductor of the first winding group, such that the second sub-winding group, the third sub-winding group of the second winding group, and the first sub-winding group of the first winding group form the first branch. On the outermost layer, the end of the third shaped conductor of the first winding group is connected to the end of the first shaped conductor of the second winding group. On the innermost layer, the end of the second shaped conductor of the first winding group is connected to the end of the first shaped conductor of the second winding group, such that the second sub-winding group, the third sub-winding group of the first winding group and the first sub-winding group of the second winding group form the second branch.

6. The motor stator of any one of claims 1 to 5, wherein, The shaped conductor has 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 are respectively arranged in two adjacent layers and in different slots. Each slot has multiple conductor legs. The first conductor leg has a first segment at its end, the end of which is configured as a first welding end; the second conductor leg has a second segment at its end, the first segment and the second segment extending out of the groove; the end of the second segment is configured as a second welding end.

7. The motor stator according to claim 6, wherein, The conductor leg has 6 layers, with the first layer being the outermost layer and the sixth layer being the innermost layer; The first winding group and the second winding group respectively include a first layer winding, a second layer winding and a third layer winding, wherein the first layer winding is arranged in the first layer and the second layer, the second layer winding is arranged in the third layer and the fourth layer, and the third layer winding is arranged in the fifth layer and the sixth layer; The shaped conductor is arranged in the first layer winding, the second layer winding, and the third layer winding; In the first layer winding, the second layer winding, and the third layer winding, the second welding end of the innermost layer abuts against the first welding end of the outermost layer; Between the first layer winding and the second layer winding, and between the second layer winding and the third layer winding, the first welding end of the innermost layer abuts against the second welding end of the outermost layer; as well as On the outermost layer, the first welding end of the third shaped conductor of the second winding group is connected to the first welding end of the first shaped conductor of the first winding group, and the first welding end of the third shaped conductor of the first winding group is connected to the first welding end of the first shaped conductor of the second winding group. On the innermost layer, the second welding end of the second shaped conductor of the second winding group is connected to the second welding end of the first shaped conductor of the first winding group, and the second welding end of the second shaped conductor of the first winding group is connected to the second welding end of the first shaped conductor of the second winding group.

8. The motor stator according to claim 1, wherein, The first branch and the second branch are connected in parallel.

9. The motor stator of claim 1 wherein, The first branch and the second branch each have a branch start end and a branch end end, which are located in the innermost layer and the outermost layer, respectively.

10. The motor stator of claim 1 wherein, The shaped conductor is a Hair-PIN or an X-PIN.

11. An electric motor comprising an electric motor stator according to any one of claims 1 to 10.

12. An electric drive assembly system comprising the motor according to claim 11.

13. A vehicle comprising the electric drive assembly system according to claim 12.

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