Motor stator, motor and vehicle

Abstract

The application provides a motor stator, a motor and a vehicle. The motor stator comprises: a stator core, which is provided with N stator slots along the circumferential direction of the stator core, and each stator slot has M layers of slot positions; and a flat wire winding, which is arranged in the stator core and comprises three-phase sub-windings, each phase sub-winding comprises two parallel branches, and each branch is formed by a plurality of coil units connected in series. In each branch, the first end point layer in each stator slot is connected to the first end point layer in another stator slot at a first span a, the second end point layer in each stator slot is connected to the second end point layer in another stator slot at a second span b, and the middle layer in each stator slot is connected to the slot position in another stator slot at the second span b, and a > b. Through the arrangement, the short-pitch winding connection mode is adopted to weaken the 5th and 7th harmonics; the long-pitch winding of the same layer is concentrated at the bottom of the stator slot, which facilitates avoiding the short-pitch winding and reduces the overall height of the flat wire winding.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor stator, a motor and a vehicle. Background Art

[0002] With the rapid development of electric vehicles, new energy drive motor windings are shifting from round wire windings to flat wire windings. Flat wire windings significantly increase slot fill rates, thereby improving efficiency. Furthermore, the low height of the flat wire winding ends reduces the space required by the drive motor.

[0003] At present, the flat wire windings of new energy vehicle motors are mostly even-numbered, and odd-layer flat wire windings are less used due to the difficulty in wiring. However, sometimes the windings of flat wire motors must be odd-numbered due to performance requirements and space limitations.

[0004] CN114301199B discloses a flat wire winding with an odd number of layers and a uniform pitch. This arrangement allows for the connection of the odd number of layers, but due to the uniform pitch, the attenuation of the 5th and 7th harmonics is limited. CN113141068B discloses a flat wire winding with an odd number of layers and a combination of long and short pitches, which can attenuate the 5th and 7th harmonics. However, due to the short pitch at one end and the long pitch at the other, the winding end at the long pitch is relatively high. CN115001184A discloses a flat wire winding with an odd number of layers and a combination of long and short pitches, which does not require an additional expansion layer for welding, but the winding end at the long pitch end is relatively high.

[0005] Therefore, how to reduce the end height and motor size while weakening the 5th and 7th harmonics with odd-numbered flat wire windings has become an urgent problem to be solved. Summary of the Invention

[0006] In view of this, the present application provides a motor stator, a motor and a vehicle, which can reduce the end height and the motor volume while weakening the 5th and 7th harmonics.

[0007] Specifically, the following technical solutions are included:

[0008] In a first aspect, an embodiment of the present application provides a motor stator, comprising:

[0009] A stator core, wherein the stator core is provided with N stator slots along its circumference, each of the stator slots having M slot layers, wherein N is an even number greater than or equal to 6, and M is an odd number greater than or equal to 3, the stator slots (11) comprising a first end point layer (11a), a second end point layer (11b), and an intermediate layer (11c), wherein the first end point layer is a slot position in each of the stator slots that is farthest from the central axis of the stator core, the second end point layer is a slot position in each of the stator slots that is closest to the central axis of the stator core, and the intermediate layer is a slot position located between the first end point layer and the second end point layer;

[0010] flat wire winding, the flat wire winding is arranged in the stator core, the flat wire winding comprises three-phase sub-windings, each phase of the sub-windings comprises two parallel branches, each of the branches is formed by a plurality of coil units in series connection;

[0011] In each of the branches, the first end point layer in each of the stator slots is connected to the first end point layer in another stator slot with a first span a, the second end point layer in each of the stator slots is connected to the second end point layer in another stator slot with a second span b, and the middle layer in each of the stator slots is connected to the slot position in another stator slot with the second span b, and a > b is satisfied.

[0012] In an optional embodiment, the coil units are arranged in the slot positions of the stator slots, the coil units comprise interlayer short-span coils, same-layer long-span coils and same-layer short-span coils, the spans of the interlayer short-span coils and the same-layer short-span coils are the second span b, and the span of the same-layer long-span coils is the first span a.

[0013] The same-layer long-span coils are used to connect two of the first end point layers, the same-layer short-span coils are used to connect two of the second end point layers, and the interlayer short-span coils are used to connect two of the slot positions in different stator slots.

[0014] In an optional embodiment, the interlayer short-span coils, the same-layer long-span coils and the same-layer short-span coils each comprise a conductor segment, a crown end and a welding end, the conductor segment is two, the crown end is connected to the first end of the two conductor segments respectively, the welding end is located at the second end of the conductor segment, the crown end is convex outward relative to one end surface of the stator core, and the welding end is convex outward relative to the other end surface of the stator core.

[0015] In an optional embodiment, each of the branches comprises two outgoing ends, the two outgoing ends are arranged in two different stator slots in a spaced manner, and the two outgoing ends are located in the first end point layers.

[0016] In an optional embodiment, the winding sequence of each of the branches is as follows:

[0017] Step one: starting from the first end point layer in the first stator slot where the first outgoing end is located, connecting to the next layer in the second stator slot through the interlayer short-span coil in a first direction, and continuing to interleave and wind in the first stator slot and the second stator slot layer by layer until connecting to the second end point layer in the first stator slot.

[0018] Step 2: Starting from the second end layer of the first stator slot, connect to the second end layer of the third stator slot through the short-pitch coils on the same layer;

[0019] Step 3: Starting from the second end point layer of the third stator slot, connecting to the next layer of the first stator slot through the interlayer short-pitch coil along the second direction, and continuing to stagger and wind layer by layer in the first stator slot and the third stator slot until connecting to the first end point layer of the third stator slot, wherein the first direction is opposite to the second direction;

[0020] Step 4: Starting from the first end point layer of the third stator slot, connect to the first end point layer of the fourth stator slot through the long-distance coil in the same layer;

[0021] Step 5: Continue winding in the order of steps 1 to 4 until the winding reaches the first terminal layer where the second lead-out end is located.

[0022] In an optional embodiment, the lead end and the crown end protrude outward relative to the same end surface of the stator core.

[0023] In an optional embodiment, each of the branches includes two lead-out ends, the two lead-out ends are arranged in two different stator slots at intervals, and the two lead-out ends are both located at the second end point layer.

[0024] In an optional embodiment, the winding order of each branch is:

[0025] Step 1: Starting from the second end layer of the first stator slot where the first lead-out terminal is located, connecting to the next layer of the second stator slot along the first direction through the interlayer short-spacing coil, and continuing to stagger and wind layer by layer in the first stator slot and the second stator slot until connecting to the first end layer of the first stator slot;

[0026] Step 2: Starting from the first end point layer of the first stator slot, connect to the first end point layer of the third stator slot through the long-distance coil in the same layer;

[0027] Step 3: Starting from the first end point layer of the third stator slot, connecting to the next layer of the fourth stator slot along the second direction through the interlayer short-pitch coil, and continuing to stagger and wind layer by layer in the third and fourth stator slots until connecting to the second end point layer of the third stator slot, wherein the first direction is opposite to the second direction;

[0028] Step 4: Starting from the second end layer of the third stator slot, connect to the second end layer of the fifth stator slot through the short-pitch coils on the same layer;

[0029] Step 5: Continue winding in the order of steps 1 to 4 until winding to the second terminal layer where the second lead-out end is located.

[0030] In an optional embodiment, in two branches connected in parallel, one of the branches satisfies: the first endpoint layer in each stator slot is connected to the first endpoint layer in the other stator slot along a third direction; the other branch satisfies: the first endpoint layer in each stator slot is connected to the first endpoint layer in the other stator slot along a fourth direction, wherein the third direction is opposite to the fourth direction.

[0031] In a second aspect, an embodiment of the present application provides a motor, comprising the motor stator provided by any embodiment of the first aspect, the motor further comprising a rotor, wherein the rotor is disposed in the motor stator.

[0032] In a third aspect, an embodiment of the present application provides a vehicle, comprising the motor provided in the second aspect.

[0033] The beneficial effects of the technical solution provided by the embodiments of the present application include at least: by setting the second end layer in each stator slot to be connected to the second end layer in another stator slot with a smaller second span b, and the middle layer in each stator slot is connected to the slot position in another stator slot with a smaller second span b, a short-pitch winding connection method is adopted, which can weaken the 5th and 7th harmonics and suppress the motor torque ripple and vibration noise; by setting the first end layer in each stator slot to be connected to the first end layer in another stator slot with a larger first span a, the long-pitch windings connected in the same layer are concentrated at the bottom of the stator slot, which is convenient for avoiding the short-pitch windings, and the overall height of the flat wire winding is reduced, thereby reducing the space occupied by the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 A schematic structural diagram of a stator core provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of assembling the same-layer long-distance coils in the stator core provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of assembling the same-layer short-spacing coils in the stator core according to an embodiment of the present application;

[0038] Figure 4 A schematic diagram of assembling the interlayer short-spacing coils in the stator core provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of the structure of the short-distance coil between layers provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of the assembly of the lead-out terminal in the stator core provided in an embodiment of the present application;

[0041] Figure 7 A schematic diagram of the connection of coil units provided in some embodiments of the present application;

[0042] Figure 8 A schematic diagram of the connection of coil units provided in some embodiments of the present application;

[0043] Figure 9 A schematic diagram of the connection of coil units provided in some embodiments of the present application;

[0044] Figure 10 A connection diagram of the coil unit provided in some embodiments of the present application.

[0045] The reference numerals in the figures represent respectively:

[0046] 10- stator core; 11- stator slot; 11a- first end layer; 11b- second end layer; 11c- middle layer; 21- short-distance coil between layers; 21a- conductor segment; 21b- crown end; 21c- welding end; 22- long-distance coil on the same layer; 23- short-distance coil on the same layer; 30- lead end; 40- rotor.

[0047] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] The directional nouns involved in the embodiments of this application, such as "upper", "lower", "side", etc., are generally expressed in the form of Figure 1 The relative relationships shown in the figure are used as a reference, and these directional terms are used only to more clearly describe the relationship between structures, not to describe absolute directions. When the product is placed in different postures, the direction may change, for example, "up" and "down" may be interchangeable.

[0050] Unless otherwise defined, all technical terms used in the examples of this application have the same meanings as those commonly understood by those skilled in the art. Some technical terms that appear in the examples of this application are explained below.

[0051] In order to make the technical solutions and advantages of the present application clearer, the implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0052] An embodiment of the present application provides a motor stator, comprising a stator core 10 and a flat wire winding. For example, the motor stator is applied to a flat wire motor.

[0053] The stator core 10 has N stator slots 11 along its circumference. Each stator slot 11 has M slot layers, where N is an even number greater than or equal to 6, and M is an odd number greater than or equal to 3. Each stator slot 11 includes a first end layer 11a, a second end layer 11b, and an intermediate layer 11c. The first end layer 11a is the slot farthest from the central axis of the stator core 10 in each stator slot 11. The second end layer 11b is the slot closest to the central axis of the stator core 10 in each stator slot 11. The intermediate layer 11c is the slot located between the first end layer 11a and the second end layer 11b.

[0054] The flat wire winding is arranged in the stator core 10 and includes three-phase sub-windings. Each phase sub-winding includes two parallel branches, and each branch is formed by connecting a plurality of coil units in series.

[0055] In each branch, the first end layer 11a in each stator slot 11 is connected to the first end layer 11a in another stator slot 11 with a first span a, the second end layer 11b in each stator slot 11 is connected to the second end layer 11b in another stator slot 11 with a second span b, and the middle layer 11c in each stator slot 11 is connected to the slot position in another stator slot 11 with a second span b, satisfying the following: a>b. For example, a=7 and b=5. It is understood that the middle layer 11c in each stator slot 11 can be connected to the middle layer 11c in another stator slot 11 with a second span b, or it can be connected to the first end layer 11a or the second end layer 11b in another stator slot 11 with a second span b.

[0056] The span indicates the number of stator slots 11 that a coil unit spans. For example, a span of 5 means that the coil unit spans five stator slots 11. For example, N is 48, M is 5, and a flat wire motor has an 8-pole, 48-slot, 5-layer winding. The number of parallel branches is 2, and the 48 stator slots 11 are divided into slots 1, 2, 3, ..., and 48. If a coil unit connects slots 1 and 6, respectively, the span of the coil unit is 5.

[0057] Furthermore, a layer connection means that if the current slot is at layer c, then the current slot is staggeredly connected to layer (c-1) or layer (c+1). For example, layer 2 of slot 8 is connected to layer 3 of slot 13 with a span of 5 layers.

[0058] A through hole is provided in the middle of the stator core 10, and the through hole is used for the rotor 40 of the motor to pass through. Figure 1 As shown, the stator slots 11 are recessed outward from the inner wall of the through hole along the radial direction of the stator core 10. The stator slots 11 penetrate the stator core 10 along the axial direction of the stator core 10. The stator slots 11 are rectangular and extend along the radial direction of the stator core 10. The multiple slots are distributed along the radial direction of the stator core 10. For example, in each stator slot 11, from the outside of the stator core 10 to the central axis of the stator core 10, the multiple slots are sequentially arranged as the first layer, the second layer, the third layer, the fourth layer, and the fifth layer. The first layer is the first end layer 11a, the fifth layer is the second end layer 11b, and the second to fourth layers are the intermediate layers 11c.

[0059] The motor stator provided in the embodiment of the present application adopts a short-pitch winding connection method by setting the second end layer 11b in each stator slot 11 to be connected to the second end layer 11b in another stator slot 11 with a smaller second span b, and the middle layer 11c in each stator slot 11 is connected to the slot position in another stator slot 11 with a smaller second span b. The 5th and 7th harmonics can be weakened and the motor torque ripple and vibration noise can be suppressed. The first end layer 11a in each stator slot 11 is connected to the first end layer 11a in another stator slot 11 with a larger first span a, so that the long-distance windings with the same layer cross-connection are concentrated at the bottom of the stator slot 11, which is convenient for avoiding the short-pitch windings and reducing the overall height of the flat wire windings, thereby reducing the space occupied by the motor.

[0060] In a further embodiment, Figures 2 to 4 As shown, the coil unit is inserted into the slot position of the stator slot 11, and the coil unit includes an interlayer short-spacing coil 21, a same-layer long-spacing coil 22 and a same-layer short-spacing coil 23. The spans of the interlayer short-spacing coil 21 and the same-layer short-spacing coil 23 are both the second span b, and the span of the same-layer long-spacing coil 22 is the first span a.

[0061] The same-layer long-distance coil 22 is used to connect the two first end-point layers 11 a , the same-layer short-distance coil 23 is used to connect the two second end-point layers 11 b , and the interlayer short-distance coil 21 is used to connect two slots located in different stator slots 11 .

[0062] Furthermore, the interlayer short-spacing coil 21, the same-layer long-spacing coil 22 and the same-layer short-spacing coil 23 all include a conductor segment 21a, a crown end 21b and a welding end 21c. There are two conductor segments 21a, the crown end 21b is respectively connected to the first ends of the two conductor segments 21a, and the welding end 21c is located at the second end of the conductor segment 21a. The crown end 21b protrudes relative to one end face of the stator core 10, and the welding end 21c protrudes relative to the other end face of the stator core 10.

[0063] Take the interlayer short-distance coil 21 as an example, Figure 5 As shown, the crown end 21b of the interlayer short-pitch coil 21 is bent, with one end connected to the upper end of one conductor segment 21a and the other end connected to the upper end of another conductor segment 21a. There are two welding ends 21c, one at the lower end of each conductor segment 21a. The conductor segments 21a are inserted into the stator slots 11, and the welding ends 21c are used to connect the conductor segments 21a to the welding ends 21c of other coil units, thereby achieving series or parallel connection between multiple coil units.

[0064] In an optional embodiment, each branch includes two lead-out terminals 30 , the two lead-out terminals 30 are spaced apart and arranged in two different stator slots 11 , and both lead-out terminals 30 are located at the first terminal layer 11 a .

[0065] Each branch forms a series loop, wherein one lead-out terminal 30 is used to introduce current into the branch, and the other lead-out terminal 30 is used to lead current out of the branch.

[0066] In this embodiment, the two lead-out terminals 30 are both located at the first end point layer 11a of the outermost layer of the stator slot 11. For example, Figure 7 As shown, U1+ and U1- represent two lead-out terminals 30 in a branch, and the span between the two lead-out terminals 30 is 7. One lead-out terminal 30 is connected to the first layer of slot 1, and the other lead-out terminal 30 is connected to the first layer of slot 8; or Figure 8 As shown, U2+ and U2- represent two lead-out terminals 30 in another branch, and the span between the two lead-out terminals 30 is 7. One lead-out terminal 30 is connected to the first layer of slot No. 2, and the other lead-out terminal 30 is connected to the first layer of slot No. 43.

[0067] Furthermore, the lead end 30 and the crown end 21b protrude outward relative to the same end surface of the stator core 10, concentrating the lead wires and the bridge wires at the same end of the stator core 10, which can reduce the number of flat wire torsion tooling dies and improve welding quality.

[0068] In a further embodiment, the winding order of each branch is:

[0069] Step 1: Starting from the first end layer 11a of the first stator slot 11 where the first lead-out terminal 30 is located, the lead-out terminal 30 is connected to the next layer of the second stator slot 11 along the first direction through the interlayer short-pitch coil 21, and continues to stagger and wind layer by layer in the first stator slot 11 and the second stator slot 11 until it connects to the second end layer 11b of the first stator slot 11;

[0070] Step 2: Starting from the second end layer 11b of the first stator slot 11, connect to the second end layer 11b of the third stator slot 11 through the short-pitch coil 23 on the same layer;

[0071] Step 3: Starting from the second end layer 11b of the third stator slot 11, the coil is connected to the next layer of the first stator slot 11 along the second direction through the interlayer short-pitch coil 21, and continues to stagger and wind layer by layer in the first stator slot 11 and the third stator slot 11 until it connects to the first end layer 11a of the third stator slot 11, wherein the first direction is opposite to the second direction;

[0072] Step 4: Starting from the first end layer 11a of the third stator slot 11, connect to the first end layer 11a of the fourth stator slot 11 through the long-distance coil 22 on the same layer;

[0073] Step 5: Continue winding in the order of steps 1 to 4 until the winding reaches the first terminal layer 11 a where the second lead-out terminal 30 is located.

[0074] For example, Figure 7As shown, when a flat wire motor with 8 poles, 48 ​​slots and 5 layers of winding is used, the number of pole pairs is 4, and (d, e) is defined as the e-th layer of the d-th slot, where d∈[1,48], e∈[1,5]. In the first branch of the U-phase winding, U1+ is connected to (1,1) and U1- is connected to (8,1). According to the order indicated by the arrows, the winding connection routes from U1+ to U1- are (1,1), (6,2), (1,3), (6,4), (1,5), (44,5), (1,4), (44,3), (1,2), (44,1), (37,1), ( , (42,2), (37,3), (42,4), (37,5), (32,5), (37,4), (32,3), (37,2), (32,1), (25,1), (30,2), (25,3), (30,4), (25,5), (20,5), (25,4), (20,3), (25,2), (20,1), (13,1), (18,2), (13,3), (18,4), (13,5), (8,5), (13,4), (8,3), (13,2), (8,1).

[0075] For example, Figure 8 As shown, in the second branch of the U-phase winding, U2+ and U2- represent the lead-out terminals 30 in the branch, U2+ is connected to (2,1), and U2- is connected to (43,1), wherein the second branch is connected in parallel with the first branch. According to the order indicated by the arrows, the winding connection routes from U2+ to U2- are (2,1), (7,2), (2,3), (7,4), (2,5), (7,5), (12,4), (7,3), (12,2), (7,1), (14,1), (19,2), (14,3), (19,4), (14,5), (19,5), (24,4), (19,3), (24, 2), (19,1), (26,1), (31,2), (26,3), (31,4), (26,5), (31,5), (36,4), (31,3), (36,2), (31,1), (38,1), (43,2), (38,3), (43,4), (38,5), (43,5), (48,4), (43,3), (48,2), (43,1).

[0076] In this embodiment, the first direction is the direction from the outside of the stator core 10 to the inside of the stator core 10, and the second direction is the direction from the inside of the stator core 10 to the outside of the stator core 10. Figure 7 and Figure 8 The "x" in the figure represents the inflow end of the coil unit, and the "o" represents the outflow end of the coil unit. The coil units are electrically connected in sequence through welding at the welding end 21c, bridge wires, etc.

[0077] Among them, since each layer in the stator slot 11 under the same pole is connected in sequence first, and then the stator slot 11 of the next pole is connected, the voltage between adjacent layers in the same slot is only the voltage drop U of the current flowing through a single coil unit, which is smaller than the interlayer voltage 2p*U of the traditional odd-layer wave winding, where 2p is the number of motor poles.

[0078] In another optional embodiment, Figure 6 As shown, each branch includes two lead-out terminals 30 , the two lead-out terminals 30 are spaced apart and arranged in two different stator slots 11 , and the two lead-out terminals 30 are both located at the second terminal layer 11 b .

[0079] In this embodiment, the two lead-out terminals 30 are both located at the second end point layer 11b of the innermost layer of the stator slot 11. For example, Figure 9 As shown, U1+ and U1- represent two lead-out terminals 30 in a branch, and the span between the two lead-out terminals 30 is 5. One lead-out terminal 30 is connected to the 5th layer of slot 48, and the other lead-out terminal 30 is connected to the 5th layer of slot 43; or Figure 10 As shown, U2+ and U2- represent two lead-out terminals 30 in another branch, and the span between the two lead-out terminals 30 is 5. One lead-out terminal 30 is connected to the 5th layer of slot 1, and the other lead-out terminal 30 is connected to the 5th layer of slot 6.

[0080] In a further embodiment, the winding order of each branch is:

[0081] Step 1: Starting from the second end layer 11b of the first stator slot 11 where the first lead-out terminal 30 is located, the lead-out terminal 30 is connected to the next layer of the second stator slot 11 along the first direction through the interlayer short-pitch coil 21, and continues to stagger and wind layer by layer in the first stator slot 11 and the second stator slot 11 until it connects to the first end layer 11a of the first stator slot 11;

[0082] Step 2: Starting from the first end layer 11a of the first stator slot 11, connect to the first end layer 11a of the third stator slot 11 through the long-distance coil 22 on the same layer;

[0083] Step 3: Starting from the first end layer 11a of the third stator slot 11, the coil is connected to the next layer of the fourth stator slot 11 along the second direction through the interlayer short-pitch coil 21, and continues to stagger and wind layer by layer in the third stator slot 11 and the fourth stator slot 11 until it connects to the second end layer 11b of the third stator slot 11, wherein the first direction is opposite to the second direction;

[0084] Step 4: Starting from the second end layer 11b of the third stator slot 11, connect to the second end layer 11b of the fifth stator slot 11 through the short-pitch coil 23 on the same layer;

[0085] Step 5: Continue winding according to the winding sequence of steps 1 to 4 until winding to the second terminal layer 11 b where the second lead-out terminal 30 is located.

[0086] For example, Figure 9 As shown, when a flat wire motor with 8 poles, 48 ​​slots and 5 layers of winding is used, the number of pole pairs is 4, and (d, e) is defined as the e-th layer of the d-th slot, where d∈[1,48], e∈[1,5]. In the first branch of the U-phase winding, U1+ is connected to (48,5) and U1- is connected to (43,5). According to the order indicated by the arrows, the winding connection routes from U1+ to U1- are (48,5), (43,4), (48,3), (43,2), (48,1), (7,1), (2,2), (7,3), (2,4), (7,5), and (12,5). , (7,4), (12,3), (7,2), (12,1), (19,1), (14,2), (19,3), (14,4), (19,5), (24,5), (19,4), (24,3), (19,2), (24,1), (31,1), (26,2), (31,3), (26,4), (31,5), (36,5), (31,4), (36,3), (31,2), (36,1), (43,1), (38,2), (43,3), (38,4), (43,5).

[0087] For example, Figure 10 As shown, in the second branch of the U-phase winding, U2+ and U2- represent the lead-out terminals 30 in the branch, U2+ is connected to (1,5), and U2- is connected to (6,5), wherein the second branch is connected in parallel with the first branch. According to the order indicated by the arrows, the winding connection routes from U2+ to U2- are (1,5), (44,4), (1,3), (44,2), (1,1), (42,1), (37,2), (42,3), (37,4), (42,5), (37,5), (32,4), (37,3), (32,2), (37,1), (30,1), (25,2), (30,3 ), (25,4), (30,5), (25,5), (20,4), (25,3), (20,2), (25,1), (18,1), (13,2), (18,3), (13,4), (18,5), (13,5), (8,4), (13,3), (8,2), (13,1), (6,1), (1,2), (6,3), (1,4), (6,5).

[0088] In this embodiment, the first direction is the direction from the inside of the stator core 10 to the outside of the stator core 10, and the second direction is the direction from the outside of the stator core 10 to the inside of the stator core 10. Figure 9 and Figure 10 The "x" in the figure represents the inflow end of the coil unit, and the "o" represents the outflow end of the coil unit. The coil units are electrically connected in sequence through welding at the welding end 21c, bridge wires, etc.

[0089] In an optional embodiment, in two branches connected in parallel, one of the branches satisfies: the first endpoint layer 11a in each stator slot 11 is connected to the first endpoint layer 11a in another stator slot 11 along a third direction; the other branch satisfies: the first endpoint layer 11a in each stator slot 11 is connected to the first endpoint layer 11a in another stator slot 11 along a fourth direction, wherein the third direction and the fourth direction are opposite.

[0090] like Figure 7 As shown, in the branch from U1+ to U1-, the first end point layer 11a in the stator slot 11 is connected to the first end point layer 11a in another stator slot 11 along the third direction, and the second end point layer 11b in the stator slot 11 is connected to the second end point layer 11b in another stator slot 11 along the third direction. The third direction is the arrangement direction from slot No. 48, slot No. 47, slot No. 46... to slot No. 1; as shown in FIG. Figure 8 As shown, in the branch from U2+ to U2-, the first endpoint layer 11a in the stator slot 11 is connected to the first endpoint layer 11a in another stator slot 11 along the fourth direction, and the second endpoint layer 11b in the stator slot 11 is connected to the second endpoint layer 11b in another stator slot 11 along the fourth direction. The fourth direction is the arrangement direction from slot No. 1, slot No. 2, slot No. 3... to slot No. 48.

[0091] Or, as Figure 9 As shown, in the branch from U1+ to U1-, the first end layer 11a in the stator slot 11 is connected to the first end layer 11a in another stator slot 11 along the third direction, and the second end layer 11b in the stator slot 11 is connected to the second end layer 11b in another stator slot 11 along the third direction, and the third direction is the arrangement direction from slot No. 1, slot No. 2, slot No. 3... to slot No. 48; Figure 10 As shown, in the branch from U2+ to U2-, the first endpoint layer 11a in the stator slot 11 is connected to the first endpoint layer 11a in another stator slot 11 along the fourth direction, and the second endpoint layer 11b in the stator slot 11 is connected to the second endpoint layer 11b in another stator slot 11 along the fourth direction. The fourth direction is the arrangement direction from slot No. 48, slot No. 47, slot No. 46... to slot No. 1.

[0092] Through the arrangement, the cross-over of the two branches under each pair of poles is realized, and the loop current of the branch winding is avoided.

[0093] The embodiment of the present application further provides a motor, which comprises the motor stator provided by any of the above embodiments, and further comprises a rotor 40, which is arranged in the motor stator.

[0094] Specifically, the motor is a flat wire motor.

[0095] Specifically, the stator core 10 has a through hole, and the rotor 40 is arranged in the through hole of the stator core 10.

[0096] The embodiment of the present application further provides a vehicle, which comprises the motor provided by any of the above embodiments. Specifically, the vehicle is a new energy vehicle such as a pure electric vehicle or a hybrid electric vehicle.

[0097] In the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited.

[0098] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains or can relate. The specification and examples are to be regarded as illustrative only.

[0099] It should be understood that the present application is not limited to the precise structures described and illustrated above and that various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the claims that follow.

Claims

1. A motor stator, characterized in that: The motor stator comprises: A stator core (10), wherein the stator core (10) is provided with N stator slots (11) along its circumference, and each stator slot (11) has M slot layers, wherein N is an even number greater than or equal to 6, and M is an odd number greater than or equal to 3, and the stator slots (11) include a first end point layer (11a), a second end point layer (11b), and an intermediate layer (11c), wherein the first end point layer (11a) is a slot position in each stator slot (11) that is farthest from the central axis of the stator core (10), the second end point layer (11b) is a slot position in each stator slot (11) that is closest to the central axis of the stator core (10), and the intermediate layer (11c) is a slot position located between the first end point layer (11a) and the second end point layer (11b); A flat wire winding, the flat wire winding being arranged in the stator core (10), the flat wire winding comprising three-phase sub-windings, each phase of the sub-winding comprising two parallel branches, each of the branches being formed by a plurality of coil units connected in series; Wherein, in each of the branches, the first end point layer (11a) in each of the stator slots (11) is connected to the first end point layer (11a) in another of the stator slots (11) with a first span a, the second end point layer (11b) in each of the stator slots (11) is connected to the second end point layer (11b) in another of the stator slots (11) with a second span b, and the intermediate layer (11c) in each of the stator slots (11) is connected to the slot position in another of the stator slots (11) with a second span b, satisfying: a>b.

2. The motor stator according to claim 1, characterized in that: The coil unit is inserted into the slot position of the stator slot (11), and the coil unit includes an interlayer short-distance coil (21), a same-layer long-distance coil (22) and a same-layer short-distance coil (23), the spans of the interlayer short-distance coil (21) and the same-layer short-distance coil (23) are both a second span b, and the span of the same-layer long-distance coil (22) is a first span a; The same-layer long-distance coil (22) is used to connect the two first end-point layers (11a), the same-layer short-distance coil (23) is used to connect the two second end-point layers (11b), and the interlayer short-distance coil (21) is used to connect two slots located in different stator slots (11) through an interlayer.

3. The motor stator according to claim 2, characterized in that: The interlayer short-distance coil (21), the same-layer long-distance coil (22) and the same-layer short-distance coil (23) all include a conductor segment (21a), a crown end (21b) and a welding end (21c); there are two conductor segments (21a); ​​the crown end (21b) is respectively connected to the first ends of the two conductor segments (21a); ​​the welding end (21c) is located at the second end of the conductor segment (21a); ​​the crown end (21b) is protruding relative to one end face of the stator core (10); and the welding end (21c) is protruding relative to the other end face of the stator core (10).

4. The motor stator according to claim 3, characterized in that: Each branch includes two lead-out ends (30), the two lead-out ends (30) are arranged at intervals in two different stator slots (11), and the two lead-out ends (30) are both located in the first end point layer (11a).

5. The motor stator according to claim 4, characterized in that: The winding order of each branch is: Step 1: Starting from the first end point layer (11a) of the first stator slot (11) where the first lead-out terminal (30) is located, connecting to the next layer of the second stator slot (11) along the first direction through the interlayer short-distance coil (21), and continuing to stagger and wind layer by layer in the first stator slot (11) and the second stator slot (11) until connecting to the second end point layer (11b) of the first stator slot (11); Step 2: Starting from the second end point layer (11b) of the first stator slot (11), connecting to the second end point layer (11b) of the third stator slot (11) through the short-distance coil (23) on the same layer; Step 3: Starting from the second end point layer (11b) of the third stator slot (11), connecting to the next layer of the first stator slot (11) along the second direction through the interlayer short-distance coil (21), and continuing to stagger and wind layer by layer in the first stator slot (11) and the third stator slot (11) until connecting to the first end point layer (11a) of the third stator slot (11), wherein the first direction is opposite to the second direction; Step 4: Starting from the first end point layer (11a) of the third stator slot (11), connecting to the first end point layer (11a) of the fourth stator slot (11) through the same-layer long-distance coil (22); Step 5: Continue winding in the order of steps 1 to 4 until winding reaches the first terminal layer (11a) where the second lead-out terminal (30) is located.

6. The motor stator according to claim 4, characterized in that: The lead-out end (30) and the crown end (21b) protrude outward relative to the same end surface of the stator core (10).

7. The motor stator according to claim 3, characterized in that: Each branch includes two lead-out ends (30), the two lead-out ends (30) are arranged at intervals in two different stator slots (11), and the two lead-out ends (30) are both located in the second end point layer (11b).

8. The motor stator according to claim 7, characterized in that: The winding order of each branch is: Step 1: Starting from the second end point layer (11b) of the first stator slot (11) where the first lead-out terminal (30) is located, connecting to the next layer of the second stator slot (11) along the first direction through the interlayer short-distance coil (21), and continuing to stagger and wind layer by layer in the first stator slot (11) and the second stator slot (11) until connecting to the first end point layer (11a) of the first stator slot (11); Step 2: Starting from the first end point layer (11a) of the first stator slot (11), connecting to the first end point layer (11a) of the third stator slot (11) through the same-layer long-distance coil (22); Step 3: Starting from the first end point layer (11a) of the third stator slot (11), connecting to the next layer of the fourth stator slot (11) along the second direction through the interlayer short-distance coil (21), and continuing to stagger and wind layer by layer in the third stator slot (11) and the fourth stator slot (11) until connecting to the second end point layer (11b) of the third stator slot (11), wherein the first direction is opposite to the second direction; Step 4: Starting from the second end point layer (11b) of the third stator slot (11), connecting to the second end point layer (11b) of the fifth stator slot (11) through the short-distance coil (23) on the same layer; Step 5: Continue winding in the order of steps 1 to 4 until winding to the second terminal layer (11b) where the second lead-out terminal (30) is located.

9. The motor stator according to claim 1, characterized in that: In the two branches connected in parallel, one of the branches satisfies: the first end point layer (11a) in each stator slot (11) is connected to the first end point layer (11a) in the other stator slot (11) along a third direction; the other branch satisfies: the first end point layer (11a) in each stator slot (11) is connected to the first end point layer (11a) in the other stator slot (11) along a fourth direction, wherein the third direction is opposite to the fourth direction.

10. A motor, characterized in that: The motor stator comprises the motor stator according to any one of claims 1 to 9, and further comprises a rotor (40), wherein the rotor (40) is disposed in the motor stator.

11. A vehicle, characterized in that: Including the motor according to claim 10.

Images