Flat wire motor and electric vehicle

Abstract

The invention discloses a flat wire motor and an electric vehicle, the flat wire motor comprises a stator core and a stator winding, the stator core comprises a plurality of stator teeth arranged at intervals along the circumferential direction of the stator core, a stator slot is defined between any two adjacent stator teeth, the stator slots are rectangular slots, and the stator teeth are sector teeth. The stator winding comprises a plurality of groups of U-shaped wires and a plurality of groups of connecting wires, the group number of the U-shaped wires, the group number of the connecting wires and the number of the stator teeth are in one-to-one correspondence, each group of U-shaped wires comprises a plurality of U-shaped wires arranged along the radial direction of the stator iron core, the plurality of U-shaped wires in each group of U-shaped wires wrap the corresponding stator teeth, each group of connecting wires comprises a plurality of connecting wires arranged along the radial direction of the stator iron core, and the plurality of connecting wires wrap the corresponding stator teeth. Two adjacent U-shaped wires in each group of U-shaped wires are connected through a connecting wire, and the parts, inserted into two adjacent stator grooves, of the U-shaped wires are arranged in a staggered manner along the circumferential direction of the stator iron core. The flat wire motor provided by the invention has the advantages that the structure is compact, the size is small, and the stator winding is tightly filled in the stator groove.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a flat wire motor and an electric vehicle. Background Art

[0002] The stator core of the in-wheel motor commonly used in electric vehicles is usually made into a ring-shaped whole, with stator slots designed on the outside, into which multiple wires are wound. To improve the utilization rate of the stator slots, some in-wheel motors use flat wire to wind the stator slots.

[0003] In the related art, the winding of the stator winding usually wraps around multiple teeth, that is, after the winding extends from one of the stator slots, it will cross multiple teeth and be inserted into another stator slot. However, this arrangement usually causes the part of the winding outside the stator slot to occupy too much space to avoid interference with the remaining windings, thereby making the axial size of the flat wire motor larger. When used as a hub motor, it has the problems of occupying a large space and low appearance. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a flat wire motor, which has the advantages of compact structure, small volume, and stator windings tightly packed in stator slots.

[0006] An embodiment of the present invention further provides an electric vehicle.

[0007] The flat wire motor of an embodiment of the present invention includes a stator core and a stator winding, wherein the stator core includes a plurality of stator teeth arranged at intervals along its circumference, and a stator slot is defined between any two adjacent stator teeth, the stator slot is a rectangular slot, and the stator teeth are fan-shaped teeth; the stator winding includes multiple groups of U-shaped wires and multiple groups of connecting wires, the number of groups of U-shaped wires, the number of groups of connecting wires and the number of stator teeth are equal and correspond one to one, each group of U-shaped wires includes multiple U-shaped wires arranged in sequence along the radial direction of the stator core, multiple U-shaped wires in each group of U-shaped wires wrap corresponding stator teeth, each group of connecting wires includes multiple connecting wires arranged in sequence along the radial direction of the stator core, adjacent two U-shaped wires in each group of U-shaped wires are connected by the connecting wire, and the parts of the U-shaped wires inserted into two adjacent stator slots are staggered along the circumference of the stator core.

[0008] According to an embodiment of the present invention, a flat wire motor is provided in which a stator winding includes multiple groups of U-shaped wires corresponding to stator teeth, and the multiple groups of U-shaped wires include multiple U-shaped wires arranged in sequence along the radial direction of the stator core, and the multiple U-shaped wires each wrap around the corresponding stator teeth. That is, a portion of the stator winding wraps around a stator tooth in the form of a U-shaped wire. At this time, when multiple U-shaped wires in the same group of U-shaped wires are connected by connecting wires, the connecting wires do not need to avoid the remaining U-shaped wires that are not connected to them in the axial direction of the stator core, and the multiple connecting wires in each group of connecting wires are arranged in sequence along the radial direction of the stator core, that is, the multiple connecting wires are located in the same horizontal plane, and all the connecting wires can be arranged closer to the end face of the stator core, thereby effectively reducing the axial size of the flat wire motor. The flat wire motor has a more compact structure and a smaller size. When used as a hub motor, it occupies less space in an electric vehicle, and the electric vehicle has a more aesthetically pleasing appearance in this area.

[0009] In some embodiments, multiple groups of the U-shaped wires are arranged sequentially along the circumference of the stator core.

[0010] In some embodiments, the U-shaped line includes a first insertion segment, a first middle segment, and a second insertion segment connected in sequence, the first insertion segment and the second insertion segment are respectively inserted into two adjacent stator slots, the first insertion segment and the second insertion segment are of the same size, and the circumferential offset distance of the first insertion segment and the second insertion segment in each U-shaped line along the stator core is greater than or equal to the maximum radial size of the first insertion segment in the stator core.

[0011] In some embodiments, the cross-section of the portion of the first insertion segment located in the stator slot at any position in its extension direction is rectangular and has the same size.

[0012] In some embodiments, the first insertion section and the second insertion section both extend axially along the stator core and partially protrude from a side of the stator core away from the first middle section, and the connecting line is located on a side of the stator core away from the first middle section;

[0013] In any two adjacent U-shaped wires of each group of the U-shaped wires, the first insertion segment in one U-shaped wire and the second insertion segment in the other U-shaped wire are arranged along the circumferential direction of the stator core and the connecting wire is welded between them.

[0014] In some embodiments, the outer contour of the connecting line is any one of a straight shape, a V shape, and a U shape.

[0015] In some embodiments, in the same group of U-shaped wires, a plurality of first insertion segments protruding from a side of the stator core away from the first middle segment are arranged at intervals along the radial direction of the stator core, and a plurality of second insertion segments protruding from a side of the stator core away from the first middle segment are arranged at intervals along the radial direction of the stator core.

[0016] In some embodiments, the flat wire motor further includes a partition, which is disposed on the side of the stator core facing away from the first middle section, and the partition forms a plurality of limiting grooves for the connecting wires to cooperate with, and the partition separates any two adjacent connecting wires arranged radially along the stator core.

[0017] In some embodiments, the stator winding defines a U-phase winding, a V-phase winding, and a W-phase winding, each of the U-phase winding, the V-phase winding, and the W-phase winding includes at least two split-phase windings arranged at intervals along the circumference of the stator core, and each of the split-phase windings includes at least two groups of U-shaped wires arranged adjacent to each other;

[0018] The stator winding further includes an inter-phase bridge wire, and in at least two of the split-phase windings in each of the U-phase winding, the V-phase winding, and the W-phase winding, two adjacent split-phase windings are connected by the inter-phase bridge wire.

[0019] In some embodiments, the inter-phase bridge line is U-shaped and includes a third insertion segment, a second intermediate segment and a fourth insertion segment connected in sequence. The third insertion segment and the fourth insertion segment are arranged along the circumference of the stator core and are respectively inserted into different stator slots. The third insertion segment is connected to the first insertion segment through the connecting line, and the fourth insertion segment is connected to the second insertion segment through the connecting line.

[0020] In some embodiments, the second middle section and the first middle section are located on the same side of the stator core;

[0021] Alternatively, the second middle section is located on the inner circumference of the stator core;

[0022] Alternatively, the second middle section is located on the outer circumference of the stator core.

[0023] In some embodiments, each of the split-phase windings further includes an inter-tooth bridge wire, and two adjacent groups of the U-shaped wires are connected via the inter-tooth bridge wire.

[0024] In some embodiments, the inter-tooth bridge line is U-shaped and includes a fifth insertion segment, a third intermediate segment and a sixth insertion segment connected in sequence. The fifth insertion segment and the sixth insertion segment are arranged along the circumference of the stator core and are respectively inserted into two adjacent stator slots. One of the first insertion segment and the second insertion segment is located between the fifth insertion segment and the sixth insertion segment along the circumference of the stator core.

[0025] An electric vehicle according to an embodiment of the present invention includes the flat wire motor as described in any of the above embodiments.

[0026] The technical advantages of the electric vehicle according to the embodiment of the present invention are the same as the technical advantages of the flat wire motor in the above embodiment, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of a flat wire motor according to an embodiment of the present invention.

[0028] Figure 2 is another schematic diagram of a flat wire motor according to an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of a stator core and insulating paper in a flat wire motor according to an embodiment of the present invention.

[0030] Figure 4 Schematic diagram of a stator core, insulating paper, and partitions in a flat wire motor according to an embodiment of the present invention.

[0031] Figure 5 FIG. 4 is a schematic diagram of a stator winding in a flat wire motor according to an embodiment of the present invention.

[0032] Figure 6 Schematic diagram of a stator core and a U-phase winding in a flat wire motor according to an embodiment of the present invention.

[0033] Figure 7 FIG. 1 is a schematic diagram of a split-phase winding in a flat wire motor according to an embodiment of the present invention.

[0034] Figure 8 FIG. 4 is a schematic diagram of a U-shaped wire in a flat wire motor according to an embodiment of the present invention.

[0035] Reference numerals:

[0036] 1. Stator core; 11. Stator slots; 12. Stator teeth; 2. Stator winding; 21. U-shaped wire; 211. First insertion section; 212. First middle section; 213. Second insertion section; 22. Connecting wire; 23. Interphase bridge wire; 24. Inter-tooth bridge wire; 25. Phase winding; 3. Partition; 4. Insulation paper. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] The following combination Figures 1-8 A flat wire motor according to an embodiment of the present invention is described.

[0039] The flat wire motor of an embodiment of the present invention includes a stator core 1 and a stator winding 2. The stator core 1 includes a plurality of stator teeth 12 arranged at intervals along its circumference. A stator slot 11 is defined between two adjacent stator teeth 12. The stator slot 11 is a rectangular slot, and the stator teeth 12 are sector-shaped teeth. The width of the stator teeth 12 gradually increases radially outward from the stator core 1. The stator winding 2 includes multiple groups of U-shaped wires 21 and multiple groups of connecting wires 22. The number of groups of U-shaped wires 21 and connecting wires 22 is equal to and corresponds to the number of stator teeth 12. Each group of U-shaped wires 21 includes multiple U-shaped wires 21 arranged in sequence along the radial direction of the stator core 1. The multiple U-shaped wires 21 in each group of U-shaped wires 21 wrap around corresponding stator teeth 12. Each group of connecting wires 22 includes multiple connecting wires 22 arranged in sequence along the radial direction of the stator core 1. Adjacent two U-shaped wires 21 in each group of U-shaped wires 21 are connected by the connecting wires 22. The portions of the U-shaped wires 21 inserted into two adjacent stator slots 11 are staggered along the circumference of the stator core 1. That is, the portions of the U-shaped wires 21 inserted into two adjacent stator slots 11 are located at different radial positions of the stator slots 11 in the stator core 1.

[0040] According to an embodiment of the flat wire motor of the present invention, the stator winding 2 is provided to include multiple groups of U-shaped wires 21 corresponding one-to-one to the stator teeth 12, and the multiple groups of U-shaped wires 21 include multiple U-shaped wires 21 arranged in sequence along the radial direction of the stator core 1, and the multiple U-shaped wires 21 all wrap the corresponding stator teeth 12. That is, a part of the stator winding 2 is wrapped around a stator tooth 12 in the form of a U-shaped wire 21. At this time, when multiple U-shaped wires 21 in the same group of U-shaped wires 21 are connected by connecting wires 22, the connecting wires 22 do not need to avoid the remaining U-shaped wires 21 that have no connection with them in the axial direction of the stator core 1, and the multiple connecting wires 22 in each group of connecting wires 22 are arranged in sequence along the radial direction of the stator core 1, that is, the multiple connecting wires 22 are located in the same horizontal plane, and all the connecting wires 22 can be arranged closer to the end face of the stator core 1, thereby effectively reducing the axial size of the flat wire motor. The flat wire motor has a more compact structure and a smaller size. When used as a hub motor, it occupies less space in the electric vehicle, and the electric vehicle has a higher appearance at this point.

[0041] It should be noted that each group of U-shaped wires 21 may include four U-shaped wires 21. The portions of the four U-shaped wires 21 located in the same stator slot 11 are arranged in sequence along the radial direction of the stator core 1 and abut against each other in pairs. The insulating paint on the outer surface of the U-shaped wire 21 ensures that the two are insulated from each other. In addition, an insulating paper 4 is inserted into each stator slot 11. The insulating paper 4 separates the portion of the stator winding 2 located in the stator slot 11 from the stator core 1 to effectively prevent electrical connection between the stator winding 2 and the stator core 1. In the same group of U-shaped wires 21, the connection between two adjacent U-shaped wires 21 through the connecting wire 22 includes series connection and parallel connection. In this embodiment, the two adjacent U-shaped wires 21 are connected in series through the connecting wire 22.

[0042] Alternatively, as Figure 5 As shown, multiple groups of U-shaped wires 21 are arranged sequentially along the circumference of the stator core 1. That is, adjacent groups of U-shaped wires 21 do not intersect each other, and the portions of the two adjacent groups of U-shaped wires 21 inserted into the same stator slot 11 are arranged along the circumference of the stator core 1. In this case, each group of U-shaped wires 21 can include a larger number of U-shaped wires 21 along the radial direction of the stator core 1, thereby achieving a more uniform distribution of the stator winding 2 and further improving the smooth operation of the motor. This arrangement also ensures that the assembly of the various groups of U-shaped wires 21 on the stator core 1 does not interfere with each other, resulting in higher assembly efficiency.

[0043] In some embodiments, the U-shaped line 21 includes a first insertion segment 211, a first middle segment 212 and a second insertion segment 213 connected in sequence. The first insertion segment 211 and the second insertion segment 213 are respectively inserted into two adjacent stator slots 11. The first insertion segment 211 and the second insertion segment 213 are of the same size. The circumferential offset distance of the first insertion segment 211 and the second insertion segment 213 in each U-shaped line 21 along the stator core 1 is greater than or equal to the maximum radial dimension of the first insertion segment 211 in the stator core 1.

[0044] That is, the first insertion section 211 and the second insertion section 213 of the U-shaped wire 21 differ by at least one radial position along the stator core 1. This arrangement allows, on the one hand, the first insertion section 211 of one U-shaped wire 21 and the second insertion section 213 of an adjacent U-shaped wire 21 within the same group of U-shaped wires 21 to be arranged circumferentially along the stator core 1. In this case, the structure of the connecting wire 22 connecting the two can be designed to be simpler and less expensive. On the other hand, it also facilitates the formation of space within the stator slot 11 for the insertion of the remaining windings (such as the windings for connecting two adjacent groups of U-shaped wires 21 in series), thereby further improving the filling density of the stator winding 2 within the stator slot 11 and further improving the power and efficiency of the motor.

[0045] For example, Figure 5 and Figure 7As shown, in each stator slot 11, in addition to the four first insertion segments 211 and the four second insertion segments 213, a space for two segments of wire insertion is formed in the stator slot 11, and one segment of wire is arranged along the circumferential direction of the stator core 1 with one first insertion segment 211, and the other segment of wire is arranged along the circumferential direction of the stator core 1 with one second insertion segment 213.

[0046] In some embodiments, the shape of the cross section of the portion of the first insertion segment 211 in the stator slot 11 at any position in the extension direction thereof is rectangular and has the same size.

[0047] On the basis of the equal number of the first insertion segments 211 and the second insertion segments 213 contained in each stator slot 11, the above-mentioned arrangement can make the size of the first insertion segments 211 and the second insertion segments 213 along the circumferential direction of the stator core 1 full, thereby effectively improving the filling density of the stator winding 2 in the stator slot 11, and effectively improving the power and efficiency of the flat wire motor.

[0048] For example, in each group of U-shaped wires 21, the size of the plurality of first intermediate layers along the radial direction of the stator core 1 gradually increases outward, so as to adapt to the corresponding fan-shaped stator teeth 12.

[0049] In some embodiments, the first insertion segment 211 and the second insertion segment 213 both extend along the axial direction of the stator core 1 and partially protrude from the side of the stator core 1 away from the first intermediate segment 212, and the connecting wire 22 is located on the side of the stator core 1 away from the first intermediate segment 212. In any two adjacent U-shaped wires 21 of each group of U-shaped wires 21, the first insertion segment 211 in one U-shaped wire 21 and the second insertion segment 213 in the other U-shaped wire 21 are arranged along the circumferential direction of the stator core 1 and are welded with the connecting wire 22 therebetween.

[0050] That is, the connecting wire 22 is welded between the first insertion segment 211 and the second insertion segment 213 arranged adjacent to and spaced along the circumferential direction of the stator core 1, thereby achieving the series connection of the two U-shaped wires 21, while effectively avoiding the connecting wire 22 being too far away from the stator core 1 to increase the axial size of the flat wire motor, and the structure of the flat wire motor is more compact and smaller in size.

[0051] For example, as shown in Figure 1 , Figure 2 and Figure 5 , the connecting wire 22 is completely hidden between the first insertion segment 211 and the second insertion segment 213, that is, the connecting wire 22 is located on the side of the active end face of the first insertion segment 211 facing the stator core 1. In other words, taking the connecting wire 22 as an example of a long strip-shaped flat wire, the thickness of the connecting wire 22 is less than or equal to the length of the portion of each of the first insertion segment 211 and the second insertion segment 213 protruding from the stator slot 11.

[0052] In some embodiments, the outer contour of the connecting line 22 is any one of a straight shape, a V shape, and a U shape.

[0053] By configuring the outer contour of the connecting wire 22 to be straight, i.e., a straight connecting wire 22, the connecting wire 22 is made smaller and less expensive. By configuring the outer contour of the connecting wire 22 to be V-shaped or U-shaped, when the first insertion section 211 and the second insertion section 213 connected by the connecting wire 22 move away from each other due to external environmental interference, the connecting wire 22 can be tensilely deformed to adjust the distance between its ends in the circumferential direction of the stator core 1. This effectively ensures the connection reliability between the connecting wire 22 and the U-shaped wire 21, and the flat wire motor has higher reliability in use.

[0054] For example, Figure 5 As shown, the outer contour of the connecting line 22 is a straight line.

[0055] It should be noted that when the outer contour of the connecting line 22 is V-shaped or U-shaped, the openings of the V-shaped groove and the U-shaped groove defined therein are arranged to face upward.

[0056] In some embodiments, in the same group of U-shaped wires 21, a plurality of first insertion sections 211 protruding from the side of the stator core 1 away from the first middle section 212 are arranged at intervals along the radial direction of the stator core 1, and a plurality of second insertion sections 213 protruding from the side of the stator core 1 away from the first middle section 212 are arranged at intervals along the radial direction of the stator core 1.

[0057] This effectively avoids the direct contact between the parts of two adjacent first insertion sections 211 in the same group of U-shaped wires 21 protruding from the stator core 1, which increases the risk of electrical connection. It also effectively avoids the direct contact between the parts of two adjacent second insertion sections 213 in the same group of U-shaped wires 21 protruding from the stator core 1, which increases the risk of electrical connection. The circuit formed by the stator winding 2 is more reliable.

[0058] For example, Figure 8 As shown, the portion of each of the first insertion segment 211 and the second insertion segment 213 protruding from the side of the stator core 1 away from the first middle segment 212 is thinned on both radial sides of the stator core 1 so that the radial size of the portion of the stator core 1 is smaller than the radial size of the portion of each of the first insertion segment 211 and the second insertion segment 213 located in the stator slot 11.

[0059] In some embodiments, the flat wire motor further includes a partition 3, which is disposed on the side of the stator core 1 away from the first middle section 212. The partition 3 forms a plurality of limiting grooves for the connecting wires 22 to cooperate with. The partition 3 separates any two adjacent connecting wires 22 arranged radially along the stator core 1.

[0060] This effectively prevents the two connecting wires 22 from abutting against each other, thereby increasing the electrical connection efficiency between the two and further ensuring the working performance of the flat wire motor.

[0061] For example, Figure 4 As shown, the partition 3 corresponds to the stator teeth 12 one by one, and five limiting grooves are provided on the surface of the partition 3 facing away from the stator core 1. The five limiting grooves are arranged at intervals along the radial direction of the stator core 1, and each of the limiting grooves is used to fit a connecting wire 22.

[0062] In some embodiments, the stator winding 2 defines a U-phase winding, a V-phase winding, and a W-phase winding. Each of the U-phase winding, the V-phase winding, and the W-phase winding includes at least two separate phase windings 25 spaced apart along the circumference of the stator core 1. Each separate phase winding 25 includes at least two adjacent sets of U-shaped wires 21. The stator winding 2 also includes interphase bridge wires 23. Adjacent two separate phase windings 25 in each of the U-phase winding, the V-phase winding, and the W-phase winding are connected by the interphase bridge wires 23.

[0063] That is, each of the U-phase winding, V-phase winding and W-phase winding is divided into multiple phase windings 25 arranged at intervals along the circumference of the stator core 1, which can effectively improve the magnetic field distribution, reduce the harmonic content, and effectively improve the motor efficiency and power density.

[0064] like Figure 6 As shown, taking the U-phase winding as an example, it includes four split-phase windings 25, each split-phase winding 25 includes four groups of U-shaped wires 21 and three inter-tooth bridge wires 24 for connecting the four groups of U-shaped wires 21 in series. The four split-phase windings 25 are connected in series through three inter-phase bridge wires 23, and the two split-phase windings 25 located at the edge both form U-connecting terminals.

[0065] It should be noted that, taking the stator winding 2 in the stator slot 11 as an example in which five layers are arranged radially along the stator core 1, two U terminals are arranged in the first layer of the stator slot 11, two V terminals are arranged in the third layer of the stator slot 11, and two W terminals are arranged in the fifth layer of the stator slot 11. One of the U terminals, one V terminal and one W terminal can be connected to each other to form a star connection. One of the U terminals can also be connected to a V terminal to form a U phase line, another V terminal is connected to one of the W terminals to form a V phase line, and another W terminal is connected to another U terminal to form a W phase line, that is, a triangle connection is formed.

[0066] For example, taking the number of stator teeth 12 as 48, the U-shaped wires 21 on the 1st to 4th teeth can be connected to form the first split-phase winding 25 of the U phase, the U-shaped wires 21 on the 13th to 16th teeth can be connected to form the second split-phase winding 25 of the U phase, the U-shaped wires 21 on the 25th to 28th teeth can be connected to form the third split-phase winding 25 of the U phase, and the U-shaped wires 21 on the 37th to 40th teeth can be connected to form the fourth split-phase winding 25 of the U phase.

[0067] The U-shaped wires 21 on teeth 5-8 are connected to form the first split-phase winding 25 of the V phase, the U-shaped wires 21 on teeth 17-20 are connected to form the second split-phase winding 25 of the V phase, the U-shaped wires 21 on teeth 29-32 are connected to form the third split-phase winding 25 of the V phase, and the U-shaped wires 21 on teeth 41-44 are connected to form the fourth split-phase winding 25 of the V phase.

[0068] The U-shaped wires 21 on teeth 9-12 are connected to form the first split-phase winding 25 of the W phase, the U-shaped wires 21 on teeth 21-24 are connected to form the second split-phase winding 25 of the W phase, the U-shaped wires 21 on teeth 33-36 are connected to form the third split-phase winding 25 of the W phase, and the U-shaped wires 21 on teeth 45-48 are connected to form the fourth split-phase winding 25 of the W phase.

[0069] The wire ends of the 1st tooth, the 5th tooth, and the 9th tooth form the motor UVW line to connect to the motor controller.

[0070] Alternatively, in at least two split-phase windings 25 in each of the U-phase winding, the V-phase winding, and the W-phase winding, two adjacent split-phase windings 25 may be connected in parallel or in series-parallel via the inter-phase bridge wire 23 .

[0071] In addition, each of the U-phase winding, the V-phase winding, and the W-phase winding may include only one split-phase winding 25 , and each split-phase winding 25 may include only one set of U-shaped wires 21 .

[0072] In some embodiments, the inter-phase bridge line 23 is U-shaped and includes a third insertion segment, a second intermediate segment and a fourth insertion segment connected in sequence. The third insertion segment and the fourth insertion segment are arranged along the circumference of the stator core 1 and are respectively inserted into different stator slots 11. The third insertion segment is connected to the first insertion segment 211 through a connecting line 22, and the fourth insertion segment is connected to the second insertion segment 213 through a connecting line 22.

[0073] The third insertion segment and the fourth insertion segment are inserted into the space left by the first insertion segment 211 and the second insertion segment 213 in the stator slot 11, further improving the utilization rate of the stator slot 11, and facilitating the connection of the third insertion segment with the first insertion segment 211 through the connecting line 22 and the connection of the fourth insertion segment with the second insertion segment 213 through the connecting line 22. At this time, the distribution of the plurality of connecting lines 22 on the side of the stator core 1 away from the first intermediate layer is uniform and regular, and the assembly efficiency of the stator winding 2 is high.

[0074] As shown in Figure 5 , the phase-to-phase bridge lines 23 in the U-phase winding, the V-phase winding and the U-phase winding are respectively located in the first layer, the third layer and the fifth layer of the stator slot 11, and do not interfere with each other in the radial direction of the stator core 1, and can be arranged in the same horizontal plane, thereby further reducing the axial size of the flat wire motor, and making the structure of the flat wire motor more compact and smaller in size.

[0075] In some embodiments, as shown in Figure 2 , Figure 5 and Figure 6 , the second intermediate segment and the first intermediate segment 212 are located on the same side of the stator core 1. Thus, the phase-to-phase bridge lines 23 effectively avoid occupying the space of the stator core 1 in the radial direction, effectively reducing the radial size of the flat wire motor.

[0076] Optionally, the second intermediate segment is located on the inner circumferential side of the stator core 1, or the second intermediate segment is located on the outer circumferential side of the stator core 1. At this time, the axial size of the flat wire motor can be further reduced, and the space occupied by the flat wire motor as a hub motor in the axial direction of the motor shaft is smaller, and the appearance of the electric vehicle at this position is more aesthetic.

[0077] It should be noted that the second intermediate segment of the phase-to-phase bridge line 23 located in the first layer can be located on the inner circumferential side of the stator core 1, the second intermediate segment of the phase-to-phase bridge line 23 located in the third layer can be located on the axial side of the stator core 1, and the second intermediate segment of the phase-to-phase bridge line 23 located in the fifth layer can be located on the outer circumferential side of the stator core 1.

[0078] In some embodiments, each phase division winding 25 further comprises a tooth-to-tooth bridge line 24, and the two adjacent groups of U-shaped lines 21 are connected through the tooth-to-tooth bridge line 24. Thus, the connection of the two adjacent U-shaped lines 21 can be achieved without bending some U-shaped lines 21, and the assembly efficiency of the stator winding 2 is higher.

[0079] For example, in each phase division winding 25, the two adjacent groups of U-shaped lines 21 are connected in series through the tooth-to-tooth bridge line 24.

[0080] In some embodiments, the inter-tooth bridge line 24 is U-shaped and includes a fifth insertion segment, a third middle segment and a sixth insertion segment connected in sequence. The fifth insertion segment and the sixth insertion segment are arranged along the circumference of the stator core 1 and are respectively inserted into two adjacent stator slots 11. One of the first insertion segment 211 and the second insertion segment 213 is located between the fifth insertion segment and the sixth insertion segment along the circumference of the stator core 1.

[0081] The fifth insertion segment and the sixth insertion segment are inserted into the space left in the stator slot 11 due to the misalignment of the first insertion segment 211 and the second insertion segment 213, which further improves the filling density of the stator winding 2 in the stator slot 11, and also facilitates the fifth insertion segment to be connected to the first insertion segment 211 through the connecting line 22, and facilitates the sixth insertion segment to be connected to the second insertion segment 213 through the connecting line 22. At this time, the multiple connecting lines 22 on the side of the stator core 1 away from the first intermediate layer are evenly and regularly distributed, and the assembly efficiency of the stator winding 2 is high.

[0082] For example, Figure 1 As shown, each group of connecting wires 22 includes five connecting wires 22, and the five connecting wires 22 are arranged at intervals along the radial direction of the stator core 1, wherein three connecting wires 22 are used to realize the series connection of four U-shaped wires 21 in the same group of U-shaped wires 21, the fourth connecting wire 22 realizes the series connection of the U-shaped wire 21 and the inter-tooth bridge wire 24, and the fifth connecting wire 22 either realizes the series connection of the U-shaped wire 21 and the inter-tooth bridge wire 24, or realizes the series connection of the U-shaped wire 21 and the inter-phase bridge wire 23.

[0083] An electric vehicle according to an embodiment of the present invention includes the flat wire motor according to any of the above embodiments.

[0084] The technical advantages of the electric vehicle according to the embodiment of the present invention are the same as the technical advantages of the flat wire motor in the above embodiment, and will not be repeated here.

[0085] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0087] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0088] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0089] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0090] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A flat wire motor, characterized in that: include: A stator core (1), the stator core (1) comprising a plurality of stator teeth (12) spaced apart along its circumference, a stator slot (11) being defined between two adjacent stator teeth (12), the stator slot (11) being a rectangular slot, and the stator teeth (12) being sector-shaped teeth; A stator winding (2), the stator winding (2) comprising a plurality of groups of U-shaped wires (21) and a plurality of groups of connecting wires (22), the number of groups of the U-shaped wires (21), the number of groups of the connecting wires (22), and the number of the stator teeth (12) being equal and corresponding one to one; Each group of U-shaped wires (21) includes a plurality of U-shaped wires (21) arranged in sequence along the radial direction of the stator core (1); the plurality of U-shaped wires (21) in each group of U-shaped wires (21) wrap the corresponding stator teeth (12); each group of connecting wires (22) includes a plurality of connecting wires (22) arranged in sequence along the radial direction of the stator core (1); two adjacent U-shaped wires (21) in each group of U-shaped wires (21) are connected by the connecting wire (22); and the portions of the U-shaped wires (21) inserted into two adjacent stator slots (11) are staggered along the circumferential direction of the stator core (1).

2. The flat wire motor according to claim 1, characterized in that: A plurality of groups of U-shaped wires (21) are arranged in sequence along the circumference of the stator core (1).

3. The flat wire motor according to claim 2, characterized in that: The U-shaped line (21) comprises a first insertion section (211), a first middle section (212) and a second insertion section (213) which are connected in sequence; The first insertion section (211) and the second insertion section (213) are respectively inserted into two adjacent stator slots (11); the first insertion section (211) and the second insertion section (213) are of the same size; and a circumferential offset distance between the first insertion section (211) and the second insertion section (213) in each U-shaped line (21) along the stator core (1) is greater than or equal to the maximum radial dimension of the first insertion section (211) in the stator core (1).

4. The flat wire motor according to claim 3, characterized in that: The cross-section of the portion of the first insertion section (211) located in the stator slot (11) at any position in its extending direction is rectangular and has the same size.

5. The flat wire motor according to claim 3, characterized in that: The first insertion section (211) and the second insertion section (213) both extend along the axial direction of the stator core (1) and partially protrude from a side of the stator core (1) away from the first middle section (212); the connecting line (22) is located on a side of the stator core (1) away from the first middle section (212); In any adjacent two U-shaped wires (21) of each group of the U-shaped wires (21), the first insertion section (211) in one of the U-shaped wires (21) and the second insertion section (213) in the other of the U-shaped wires (21) are arranged along the circumferential direction of the stator core (1) and the connecting wire (22) is welded between them.

6. The flat wire motor according to claim 5, characterized in that: The outer contour of the connecting line (22) is any one of a straight shape, a V shape and a U shape.

7. The flat wire motor according to claim 5, characterized in that: In the same group of U-shaped wires (21), portions of a plurality of first insertion sections (211) protruding from a side of the stator core (1) away from the first middle section (212) are arranged at intervals along the radial direction of the stator core (1), and portions of a plurality of second insertion sections (213) protruding from a side of the stator core (1) away from the first middle section (212) are arranged at intervals along the radial direction of the stator core (1).

8. The flat wire motor according to claim 5, characterized in that: The flat wire motor further comprises a partition (3), the partition (3) being arranged on a side of the stator core (1) facing away from the first middle section (212), the partition (3) forming a plurality of limiting grooves for the connecting wires (22) to cooperate with, and the partition (3) separating any two adjacent connecting wires (22) arranged radially along the stator core (1).

9. The flat wire motor according to any one of claims 3 to 8, characterized in that: The stator winding (2) defines a U-phase winding, a V-phase winding, and a W-phase winding, each of the U-phase winding, the V-phase winding, and the W-phase winding comprises at least two phase-splitting windings (25) arranged at intervals along the circumference of the stator core (1), and each phase-splitting winding (25) comprises at least two groups of U-shaped wires (21) arranged adjacent to each other; The stator winding (2) further includes an interphase bridge wire (23), and in at least two of the split-phase windings (25) in each of the U-phase winding, the V-phase winding, and the W-phase winding, two adjacent split-phase windings (25) are connected via the interphase bridge wire (23).

10. The flat wire motor according to claim 9, characterized in that: The interphase bridge wire (23) is U-shaped and comprises a third insertion section, a second middle section and a fourth insertion section which are connected in sequence. The third insertion section and the fourth insertion section are arranged along the circumference of the stator core (1) and are respectively inserted into different stator slots (11). The third insertion section is connected to the first insertion section (211) via the connecting wire (22), and the fourth insertion section is connected to the second insertion section (213) via the connecting wire (22).

11. The flat wire motor according to claim 10, characterized in that: The second middle section and the first middle section (212) are located on the same side of the stator core (1); Alternatively, the second intermediate section is located on the inner circumference of the stator core (1); Alternatively, the second middle section is located on the outer peripheral side of the stator core (1).

12. The flat wire motor according to claim 9, characterized in that: Each of the split-phase windings (25) further comprises an inter-tooth bridge wire (24), and two adjacent groups of the U-shaped wires (21) are connected via the inter-tooth bridge wire (24).

13. The flat wire motor according to claim 12, characterized in that: The inter-tooth bridge wire (24) is U-shaped and comprises a fifth insertion segment, a third middle segment and a sixth insertion segment connected in sequence, the fifth insertion segment and the sixth insertion segment are arranged along the circumference of the stator core (1) and are respectively inserted into two adjacent stator slots (11), and one of the first insertion segment (211) and the second insertion segment (213) is located between the fifth insertion segment and the sixth insertion segment along the circumference of the stator core (1).

14. An electric vehicle, characterized in that: The invention comprises a flat wire motor according to any one of claims 1 to 13.

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