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

Abstract

The present disclosure relates to an electric machine stator, the stator coil of which comprises three first phase windings. Each first phase winding comprises a plurality of shaped conductors connected in series, the shaped conductors comprising full-pitch shaped conductors, short-pitch shaped conductors and long-pitch shaped conductors. The shaped conductors each 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 arranged in different slots, respectively, a plurality of layers of conductor legs being arranged in each slot. Each first phase winding comprises a plurality of layer windings connected in series. Each layer winding comprises a plurality of branches, each branch being formed by a plurality of full-pitch shaped conductors connected in series, two adjacent ones of the plurality of branches being connected by a long-pitch shaped conductor. Two adjacent ones of the plurality of layer windings are connected by a short-pitch shaped conductor. The present disclosure also relates to an electric machine comprising the electric machine stator, an electric drive assembly system comprising the electric machine and a vehicle comprising 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 first-phase windings; wherein each first-phase winding comprises multiple shaped conductors connected in series, the shaped conductors comprising full-pitch shaped conductors, short-pitch shaped conductors, and long-pitch shaped conductors, wherein each 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 being respectively arranged in different slots, each slot having multiple layers of conductor legs; wherein each first-phase winding comprises multiple layer windings connected in series; wherein each layer winding comprises multiple branches, each branch being formed by multiple full-pitch shaped conductors connected in series, two adjacent branches being connected through the long-pitch shaped conductor; and wherein two adjacent layer windings are connected through the short-pitch shaped conductor.

[0006] In an embodiment according to this disclosure, the stator coil further includes three second phase windings having the same structure as the first phase windings, wherein the arrangement of the shaped conductors in the second phase windings is offset by a pole pitch relative to the arrangement of the shaped conductors in the first phase windings, and the first phase windings are connected in parallel with the second phase windings.

[0007] In an embodiment according to this disclosure, the motor stator has 3 slots per pole per phase, and each layer winding includes three branches.

[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 conductor leg has six layers, and each first phase winding includes three layers of winding.

[0010] 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; wherein each first phase winding includes a first layer winding, a second layer winding, and a third layer winding, the shaped conductors of the first layer winding are arranged in the first and second layers, the shaped conductors of the second layer winding are arranged in the third and fourth layers, and the shaped conductors of the third layer winding are arranged in the fifth and sixth layers; wherein the first, second, and third layer windings each include three parallel branches, each branch being formed by series connection of full-pitch shaped conductors with a span of 9 slots, and two adjacent branches are connected by long-pitch shaped conductors with a span of 10 slots; and wherein the first layer winding and the second layer winding are connected by short-pitch shaped conductors with a span of 7 slots, which are arranged in the second and third layers, and the second layer winding and the third layer winding are connected by short-pitch shaped conductors with a span of 7 slots, which are arranged in the fourth and fifth layers.

[0011] In an embodiment according to this disclosure, on the non-welded end side of the stator coil, the non-welded ends of the full-pitch molded conductor and the long-pitch molded conductor are located on the upper surface, and the non-welded end of the short-pitch molded conductor is located on the lower surface.

[0012] In an embodiment according to this disclosure, the current input terminal and current output terminal of the first phase winding are located on the non-welded end side of the motor stator.

[0013] In embodiments according to this disclosure, the shaped conductor is configured as a Hair-PIN or an X-PIN.

[0014] In an embodiment according to this disclosure, the end of the first conductor leg has a first segment, the end of the second conductor leg has a second segment, and the first segment and the second segment extend out of the groove; and wherein the series connection of the shaped conductors is achieved by the welding end of the second segment of each shaped conductor abutting and aligning with the welding end of the first segment of another shaped conductor in a radial direction.

[0015] This disclosure also provides an electric motor, which includes the motor stator described above and in the embodiments of this disclosure.

[0016] This disclosure also provides an electric drive assembly system, which includes the motor described above.

[0017] This disclosure also provides a vehicle that includes the electric drive system described above. Attached Figure Description

[0018] 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.

[0019] Figure 1 A schematic diagram of the structure of a motor stator according to an embodiment of the present disclosure is shown.

[0020] Figure 2 A schematic diagram of the welded end side of the stator coil according to an embodiment of the present disclosure is shown.

[0021] Figure 3 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 4 Another schematic diagram of the non-welded end side of the stator coil according to an embodiment of the present disclosure is shown.

[0023] Figure 5 A schematic diagram of a first type of molded conductor according to an embodiment of the present disclosure is shown.

[0024] Figure 6 A schematic diagram of a second type of molded conductor according to an embodiment of the present disclosure is shown.

[0025] Figure 7 A winding diagram of the U-phase winding of the stator coil according to an embodiment of the present disclosure is shown.

[0026] Figure 8 A winding diagram of the W-phase winding of the stator coil according to an embodiment of the present disclosure is shown, and

[0027] Figure 9 A winding diagram of the V-phase winding of a stator coil according to an embodiment of the present disclosure is shown. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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 embodiment shown, the stator core 110 has 54 slots 101.

[0031] Stator coils 120 are arranged in slots 101 of the stator core 110. In embodiments configured as AC motors, such as asynchronous or synchronous motors, the stator coils 120 have three phase windings for the three phases U, V, and W. The U-phase winding, V-phase winding, and W-phase winding may each have at least one phase winding, such as a first phase winding, or they may each have multiple phase windings, such as a first phase winding and a second phase winding. In the case of multiple phase windings, the multiple phase windings can be connected in parallel.

[0032] In embodiments according to this disclosure, a phase winding may have multiple layers, i.e., a phase winding may include multiple layer windings connected in series. Figure 1 The stator coil 120 shown has three layers of windings. These three layers of windings form three concentric loops. Accordingly, multiple layers of conductor legs need to be arranged in one slot 101, the number of conductor legs being equal to the number of layers of windings multiplied by 2. Figure 1 In the embodiment shown, six layers of conductor legs are arranged in a slot 101.

[0033] 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 The diagram shows the second type of shaped conductor 600, whose specific structure is shown in [the diagram]. Figure 6 As shown in the diagram. The first type of molded conductor 500 according to this disclosure can be, for example, a hair-pin, an X-pin, and other molded conductors known in the art. The connection relationships of the various molded conductors 121 will be described in detail later. Figure 1 In the middle, the upper end face of the stator coil 120 is the welding end side 130 of the stator coil 120, which is in Figure 2 The details are shown in the diagram; the lower end face of the stator coil 120 is the non-welded end side of the stator coil 120, i.e., the crown end side 140, which is in Figure 3 and Figure 4 It is shown in detail in the middle.

[0034] Figure 5 A schematic diagram of a first molded conductor 510 according to an embodiment of the present disclosure is shown. The first molded conductor 500 has a first conductor leg 501 and 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 molded conductor 500 is bent relative to the first conductor leg 501, for example, bent in a counterclockwise direction. The second segment 504 of the second molded conductor 500 is bent relative to the second conductor leg 502, for example, bent in a clockwise direction, so that the first segment 503 of the first molded conductor 500 and the second segment 504 of the second molded conductor 500 approach and abut against each other. 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.

[0035] In embodiments of this disclosure, the first type of molded conductor 500 may include, for example, a full-pitch molded conductor, a short-pitch molded conductor, and a long-pitch molded conductor. Full pitch means the pitch is equal to the pole pitch; short pitch means the pitch is less than the pole pitch; long pitch means the pitch is greater than the pole pitch. 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 divided by the number of magnetic poles.

[0036] Figure 6A schematic diagram of a second type of molded conductor 600 according to an embodiment of the present disclosure is shown. The second type of molded conductor 600 has a conductor leg 601 (arranged in a slot 101), a first segment 603, and a second segment 604 (extending from the slot 101). The first segment 603 may be arranged on the welding end side 130 and has a first welding end 605. The second segment 604 may be arranged on the non-welding end side 140, and the end 606 of the second segment 604 may form the end of a phase winding.

[0037] Figure 2 A schematic diagram of the weld end side 130 of the stator coil 120 according to an embodiment of the present disclosure is shown. Figure 2 As can be seen, all the first sections 503 and 603 of the formed conductors are uniformly bent counterclockwise, and all the second sections 504 and 604 of the formed conductors are uniformly bent clockwise. There are no specially bent first sections 503 and 603 or second sections 504 and 604. The first welding ends 505 and 605 and the second welding ends 506 are aligned and abutted against each other in pairs, making the welding operation between the welding ends very easy. In contrast, in the prior art, some welding ends of the phase windings of multilayer windings often cannot be aligned and abutted against each other. To connect such welding ends, additional conductors are usually required to bridge the two welding ends. This increases the complexity of the welding operation and also places special requirements on the tooling used to bend the first and second sections, increasing the complexity of the tooling. Alternatively, the tooling may not be able to bend all the first and second sections into place through a simple operation, such as two bending operations.

[0038] Figure 3 A schematic diagram of the non-welded end 140 of a stator coil 120 according to an embodiment of the present disclosure is shown. The stator coil 120 includes a full-pitch molded conductor 510, a long-pitch molded conductor 520, which belong to a first type of molded conductor 500, and a second type of molded conductor 600. The stator coil 120 also includes a short-pitch molded conductor 530, which... Figure 3 The middle is covered by the full-pitch shaped conductor 510 and the long-pitch shaped conductor 520. The short-pitch shaped conductor 530 is in... Figure 4 It is shown in detail in the middle. Figure 4 Compared to Figure 3 A portion of the outermost shaped conductor of the stator coil 120 was removed to expose the covered short-pitch shaped conductor 530. From Figure 4 As can be seen, the non-welded ends of the full-pitch formed conductor 510 and the long-pitch formed conductor 520 are located on the upper surface of the welded end side 140, while the non-welded ends of the short-pitch formed conductor 530 are located on the lower surface of the welded end side 140.

[0039] The ends of the second type of shaped conductor 600 (ends 606 of the second section 604) respectively form the current input terminal and the current output terminal of the phase winding. Figure 3 The diagram shows 12 second-type shaped conductors 600, the ends of which respectively form the current input and current output terminals of a total of six phase windings (winding lines) of a three-phase winding.

[0040] The connection relationship of the shaped conductor 121 is in Figure 7 , Figure 8 and Figure 9 It is shown in detail in the middle. Figure 7 , Figure 8 and Figure 9 The winding diagrams of the stator coils according to embodiments of the present disclosure, namely the U-phase winding, W-phase winding, and V-phase winding, are shown respectively. Each phase winding has a first phase winding (i.e., a first winding line) and a second phase winding (i.e., a second winding line), which can be connected in parallel. For example, the ends of the first phase winding and the second phase winding with the same arrow direction in the diagram can be connected to each other.

[0041] The stator core has 54 slots, which are in 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,...

[0042] exist Figure 7 , Figure 8 and Figure 9 In the diagram, small squares represent conductor legs extending along the axial direction of stator coil 120. 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. Dashed lines connect two conductor legs of adjacent layers to each other. 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 of a solid line is defined as the second segment and its second welded end.

[0043] Each phase winding consists of three layers of windings. Figure 7Taking the U-phase winding as an example, the first phase winding of the U-phase winding includes a first layer winding 710, a second layer winding 720, and a third layer winding 730. The first layer winding 710 is arranged in the first and second layers, the second layer winding 720 is arranged in the third and fourth layers, and the third layer winding 730 is arranged in the fifth and sixth layers.

[0044] As can be seen from the winding diagram, the full-pitch shaped conductor 510 spans two layers and nine slots, while the long-pitch shaped conductor 520 spans two layers and ten slots. The full-pitch shaped conductor 510 and the long-pitch shaped conductor 530 are arranged in the first layer winding 710, the second layer winding 720, and the third layer winding 730. The short-pitch shaped conductor 530 spans two layers and eight slots. The short-pitch shaped conductor 530 is arranged between the first layer winding 710 and the second layer winding 720, and between the second layer winding 720 and the third layer winding 730.

[0045] In this disclosure, the first layer is defined as the outermost layer, and the sixth layer is defined as the innermost layer. In the first layer winding 710, the second layer winding 720, and the third layer winding 730, the first weld end of the innermost layer abuts against the second weld end of the outermost layer.

[0046] In this disclosure, multiple layer windings are connected in series. Each layer winding includes multiple branches, each branch consisting of multiple full-pitch shaped conductors connected in series, with adjacent branches connected by long-pitch shaped conductors. Adjacent layers are connected by short-pitch shaped conductors.

[0047] by Figure 7 Taking the U-phase winding shown as an example, the first layer winding 710 includes three branches 711, 712, and 713; the second layer winding 720 includes three branches 721, 722, and 723; and the third layer winding 730 includes three branches 731, 732, and 733. Each branch is formed by two full-pitch shaped conductors 510 connected in series. The three branches in one layer winding are connected in series through long-pitch shaped conductors 520. Figure 7Taking the first layer winding 710 as an example, branch 711 is connected to branch 712 via long-pitch shaped conductors 520 in slots 19 and 29, and branch 712 is connected to branch 713 via long-pitch shaped conductors 520 in slots 20 and 30, thus forming the first layer winding 710. The second layer winding 720 and the third layer winding 730 are formed in the same manner. The first layer winding 710 and the second layer winding 720 are connected via short-pitch shaped conductors 530 in slots 12 and 19, that is, branch 713 in the first layer winding 710 is connected to branch 721 in the second layer winding 720. Similarly, the second layer winding 720 and the third layer winding 730 are connected via short-pitch shaped conductors 530 in slots 12 and 19, that is, branch 723 in the second layer winding 720 is connected to branch 731 in the third layer winding 730. Thus, the first winding 710, the second winding 720, and the third winding 730 connected in series form a first winding circuit. The two ends of the first winding circuit are also connected to a second type of shaped conductor 600, namely the second type of shaped conductor 600 arranged in the 19 slots of the first layer and the second type of shaped conductor 600 arranged in the 12 slots of the sixth layer, which guides the two ends of the first winding circuit to the non-welded end side 140.

[0048] In the same manner, a second winding circuit is also arranged in the U-phase winding. The second winding circuit has the same structure as the first winding circuit, but the arrangement of the shaped conductors in the second winding circuit is offset by one pole pitch, or nine slots, relative to the arrangement of the shaped conductors in the first winding circuit.

[0049] The following is combined with Figure 7 , Figure 8 and Figure 9 The specific arrangement of each phase winding is explained below. 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, that is, 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°, that is, one phase band is 60°. The three-phase windings therefore include 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+.

[0050] like Figure 7 , Figure 8 and Figure 9As 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.

[0051] 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.

[0052] 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.

[0053] Conductors (conductor legs of shaped conductors) are arranged in all slots, and conductors in a phase winding of the same phase (U phase, V phase, or W phase) are connected in series in sequence.

[0054] In embodiments of this disclosure, three shaped conductors in three slots assigned to each pole and each phase constitute a pole phase group. Therefore, each pole phase group includes a first shaped conductor PIN1, a second shaped conductor PIN2, and a third shaped conductor PIN3. Figure 7 Taking one pole group in the first layer winding 710 of the U-phase as an example, the first shaped conductor PIN1 occupies slot 28 of the second layer and slot 37 of the first layer, the second shaped conductor PIN2 occupies slot 29 of the second layer and slot 38 of the first layer, and the third shaped conductor PIN3 occupies slot 30 of the second layer and slot 39 of the first layer. The pitch of these three shaped conductors is 9 and they are inclined clockwise. Branch 711 is formed by connecting the first shaped conductor PIN1 in each pole group of the first layer winding 710 in series. Branch 712 is formed by connecting the second shaped conductor PIN2 in each pole group of the first layer winding 710 in series. Branch 713 is formed by connecting the third shaped conductor PIN3 in each pole group of the first layer winding 710 in series.

[0055] Branches 711 and 712 are connected in series via long-pitch shaped conductors 520 occupying slots 10 of the second layer and slot 20 of the first layer. Branches 712 and 713 are also connected in series via long-pitch shaped conductors 520 occupying slots 10 of the second layer and slot 20 of the first layer. The long-pitch shaped conductors 520 have a clockwise tilt. In this way, branches 711, 712, and 713 are connected in series to form the first layer winding 710.

[0056] The second winding 720 and the third winding 730 can be constructed in the same way.

[0057] The first layer winding 710 and the second layer winding 720 are connected in series via short-pitch shaped conductors 530 in slots 12 of the second layer and 19 of the third layer. The second layer winding 720 and the third layer winding 730 are also connected in series via short-pitch shaped conductors 530 in slots 12 of the fourth layer and 19 of the fifth layer. The short-pitch shaped conductors 530 have a counterclockwise tilt. In this way, the first layer winding 710, the second layer winding 720, and the third layer winding 730 are connected in series to form the first winding circuit, i.e., the first phase winding.

[0058] The two ends of the first winding line are also connected to a second type of shaped conductor 600, namely the second type of shaped conductor 600 arranged in the 19 slots of the first layer and the second type of shaped conductor 600 arranged in the 12 slots of the sixth layer, which guides the two ends of the first winding line to the non-welded end side 140.

[0059] In the same manner, a second winding line, namely the second phase winding, is also arranged in the U-phase winding. The second winding line has the same structure as the first winding line, but the arrangement of the shaped conductors in the second winding line is offset by one pole pitch, or nine slots, relative to the arrangement of the shaped conductors in the first winding line.

[0060] In embodiments according to this disclosure, the first type of molded conductor 500 can be specifically classified according to the number of slots and layers it spans, and the second type of molded conductor 600 can be classified according to the type of layer it is in. Specific classifications are shown in the table below.

[0061]

[0062]

[0063] The stator coil according to this disclosure comprises a total of 168 shaped conductors.

[0064] According to another aspect of this disclosure, an electric motor is proposed, which includes an electric stator as described above.

[0065] According to another aspect of this disclosure, an electric drive assembly system is proposed, which includes the motor as described above.

[0066] 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. Based on the above, the vehicle can realize the functions of the synchronous motor as described above and has the advantages described above.

[0067] 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.

[0068] 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 Stator coil, the stator coil comprising three first phase windings; Each first phase winding includes multiple shaped conductors connected in series. The shaped conductors include full-pitch shaped conductors, short-pitch shaped conductors, and long-pitch shaped conductors. Each 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 different slots, and each slot has multiple layers of conductor legs. Each first phase winding includes multiple layer windings, which are connected in series. Each layer winding includes multiple branches, each branch being composed of multiple full-pitch shaped conductors connected in series, and two adjacent branches are connected by the long-pitch shaped conductor; and In this configuration, two adjacent layers of winding are connected by the short-pitch shaped conductor.

2. The motor stator according to claim 1, wherein, The stator coil also includes three second phase windings, which have the same structure as the first phase windings. The arrangement of the shaped conductors in the second phase windings is offset by one pole pitch relative to the arrangement of the shaped conductors in the first phase windings. The first phase windings and the second phase windings are connected in parallel.

3. The motor stator according to claim 1, wherein, The motor stator has 3 slots per pole per phase, and each layer winding includes three branches.

4. The motor stator according to 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 conductor leg has 6 layers, and each first phase winding includes three layers of winding.

6. 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; Each first phase winding includes a first layer winding, a second layer winding, and a third layer winding. The shaped conductors of the first layer winding are arranged in the first and second layers, the shaped conductors of the second layer winding are arranged in the third and fourth layers, and the shaped conductors of the third layer winding are arranged in the fifth and sixth layers. The first, second, and third winding layers each include three parallel branches, each branch consisting of series-connected integral-pitch shaped conductors with a span of 9 slots. Adjacent branches are connected by long-pitch shaped conductors with a span of 10 slots. The first layer winding and the second layer winding are connected by a short-pitch shaped conductor with a span of 7 slots, and are arranged in the second and third layers. The second layer winding and the third layer winding are connected by a short-pitch shaped conductor with a span of 7 slots, and are arranged in the fourth and fifth layers.

7. The motor stator according to claim 1, wherein, On the non-welded end side of the stator coil, the non-welded ends of the full-pitch molded conductor and the long-pitch molded conductor are located on the upper surface, and the non-welded end of the short-pitch molded conductor is located on the lower surface.

8. The motor stator according to claim 1, wherein, The current input terminal and current output terminal of the first phase winding are located on the non-welded end side of the motor stator.

9. The motor stator according to claim 1, wherein, The shaped conductor is configured as a Hair-PIN or X-PIN.

10. The motor stator according to claim 1, wherein, The first conductor leg has a first segment at its end, and the second conductor leg has a second segment at its end, with the first and second segments extending out of the groove; and The series connection of the shaped conductors is achieved by the following method: the welding end of the second segment of each shaped conductor and the welding end of the first segment of another shaped conductor are aligned and abutted against each other in the radial direction.

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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