Stator of flat wire motor

Abstract

The invention provides a stator of a flat wire motor, which comprises a stator core and a flat wire winding, the number of winding slots of the stator core is 48, the number of poles of the flat wire winding is 8, the number of winding slots of each pole and each phase of the stator core is 2, the number L of layers formed by the flat wire winding in the winding slots is an even number greater than 2, the flat wire winding of each phase comprises four branches, and the branches are parallel to each other. Each branch is wound in the form of a continuous wave winding; the winding of each branch circuit is subjected to continuous cross-layer wire embedding between the first layer and the Lth layer and traverses each pole in the circumferential direction, the interval between the adjacent slots embedded between the radial outermost layer or the radial innermost layer of the winding of each branch circuit is 5, and the intervals between the adjacent slots embedded between the other layers of the winding of each branch circuit are all 6. The winding structure of the stator of the flat wire motor is simple, the end size is small, the resistance of the winding is reduced, the loss of the motor can be reduced, and the operation efficiency of the motor is improved. No welding point exists in the flat wire of each branch, so that the reliability of the winding can be improved.

Description

stator of flat wire motor Technical Field

[0001] This application relates to the field of motor technology, and more specifically to a stator for a flat wire motor. Background Technology

[0002] With the development of new energy vehicle motor technology, the use of flat wire as winding in motor stators is becoming increasingly widespread. Currently, the flat wire used in motors is mostly copper flat wire.

[0003] However, copper flat wires have problems such as heavy weight and high manufacturing cost, and copper flat wires have large AC losses at high frequencies. Summary of the Invention

[0004] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art and to provide a stator for a flat wire motor.

[0005] According to a first aspect of this application, a stator for a flat wire motor is provided, comprising a stator core and a flat wire winding. The stator core has 48 winding slots, the flat wire winding has 8 poles, and the flat wire winding has three-phase windings. The number of winding slots per pole per phase of the stator core is 2. The number of layers L formed by the flat wire winding in the winding slots is an even number greater than 2. Each phase of the flat wire winding includes 4 branches, each branch is wound in the form of a continuous wave winding, and the material of the flat wire winding includes aluminum. The winding of each branch is continuously interlaced across layers between the first layer and the Lth layer and traverses each pole in the circumferential direction. The spacing between adjacent slots embedded between the outermost or innermost radial layers of the winding of each branch is 5, and the spacing between adjacent slots embedded between other layers is 6.

[0006] In at least one embodiment, in the winding of each branch, a same-layer turn-back is performed on the Lth layer before crossing from the L-1th layer, and a same-layer turn-back is performed on the 1st layer before crossing from the 1st layer to the 2nd layer.

[0007] In at least one embodiment, the two consecutive winding slots occupied by the flat wire winding of each phase at each pole are respectively a first type of slot and a second type of slot; the winding slots of adjacent poles in which the windings are folded back in the Lth layer are of the same type of slot, and the winding slots of adjacent poles in which the windings are folded back in the 1st layer are of different types of slots; or, the winding slots of adjacent poles in which the windings are folded back in the 1st layer are of the same type of slot, and the winding slots of adjacent poles in which the windings are folded back in the Lth layer are of different types of slots.

[0008] In at least one embodiment, the outgoing and leading ends of each branch are located in the outermost radial layer, or the outgoing and leading ends of each branch are located in the innermost radial layer.

[0009] In at least one embodiment, the four branches are connected in parallel, or, every two of the four branches are connected in series to form one small branch, and the two small branches are connected in parallel.

[0010] In at least one embodiment, the continuous wave winding of each branch is a hollow flat wire, the hollow flat wire including a core with cooling channels and an insulating layer covering the core, the core being made of aluminum.

[0011] In at least one embodiment, the core includes a first core and a second core, the first core being a hollow copper wire; the second core covering the outer peripheral wall of the first core, and the second core being made of aluminum.

[0012] In at least one embodiment, the core further includes a limiting hoop, which is sleeved on the outer peripheral wall of the end of the second core; the limiting hoop and the first core are made of the same material and are integrally formed.

[0013] In at least one embodiment, one end of the limiting clamp is connected to the first core, and the other end extends into the winding groove.

[0014] In at least one embodiment, a stator core is provided with a lead bus and a busbar at one end. Both the lead bus and the busbar include an annular body, and the annular body includes an annular flow channel. Each annular body is connected to a plurality of connecting terminals. The connecting terminals form a flow guiding channel and a connecting hole for hollow flat wires to pass through. The flow guiding channel is connected to both the annular flow channel and the cooling channel. The connecting terminals are made of the same material as the welded joints of the hollow flat wires.

[0015] The stator winding structure of the flat wire motor according to this application is simple and the end size is small, which reduces the DC resistance of the winding, thereby reducing motor losses and improving motor operating efficiency. At the same time, there are no solder joints within the flat wires of each branch, which improves the reliability of the winding.

[0016] Moreover, the stator windings of Benshen's flat wire motor are made of aluminum, which greatly reduces the weight of the stator and is conducive to the lightweight development of motors. Attached Figure Description

[0017] Figure 1 is a perspective view of the stator of a flat wire motor provided according to the first embodiment of this application.

[0018] Figure 2 is a three-dimensional structural diagram of one branch of the winding of one phase in Figure 1.

[0019] Figure 3 is a top view of Figure 2.

[0020] Figure 4 is the front view of Figure 2.

[0021] Figure 5 is a schematic diagram of two branch connection methods of the winding of the flat wire motor provided according to the first embodiment of this application.

[0022] Figure 6 is a schematic diagram of the wiring configuration of one phase of the stator winding of a flat wire motor provided according to the first embodiment of this application.

[0023] Figure 7 is a breakdown diagram of the routing of one branch in Figure 6.

[0024] Figure 8 is a perspective view of the stator of a flat wire motor provided according to the second embodiment of this application.

[0025] Figure 9 is a three-dimensional schematic diagram of the stator of the flat wire motor shown in Figure 8 from another perspective.

[0026] Figure 10 is a top view of Figure 8.

[0027] Figure 11 is a radial cross-sectional view of the hollow flat wire of the stator of the flat wire motor provided according to the second embodiment of this application, located in the winding groove portion.

[0028] Figure 12 is a diagram showing the positional relationship between the end axial section of the hollow flat wire of the stator of the flat wire motor provided according to the second embodiment of this application and the stator core.

[0029] Figure 13 is a top view of the outgoing line and busbar in Figure 8.

[0030] Figure 14 is a rear view of the outgoing line and busbar in Figure 8.

[0031] Figure 15 is a three-dimensional schematic diagram of the connecting terminals in Figure 8.

[0032] Figure 16 is a cross-sectional view of the connecting terminals in Figure 8.

[0033] Figure 17 is a radial cross-sectional view of the hollow flat wire of the stator of the flat wire motor provided according to the third embodiment of this application.

[0034] Explanation of reference numerals in the attached diagram: S-Stator core; W-Winding; 10-Outgoing line; 11-First flow channel; 20-Busbar; 21-Second flow channel; 30-Connecting terminal; 31-Wire hole; 32-Flow channel; 33-Connecting hole; 40-Hollow flat wire; 41-Core; 41a-First core; 41b-Second core; 41c-Limiting clamp; 42-Insulation layer; 43-Cooling channel. Detailed Implementation

[0035] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0036] Unless otherwise specified, the terms radial, axial, and circumferential as used below refer to the radial, axial, and circumferential directions of the stator.

[0037] The first embodiment refers to Figures 1 to 7, which describe the stator of a flat wire motor according to one embodiment of the present application.

[0038] In this embodiment, the stator includes an iron core C and a winding W, wherein the winding W is a flat wire winding with a generally rectangular cross-section. Moreover, the material used to manufacture the flat wire winding includes aluminum. Optionally, the winding W is made of aluminum flat wire or aluminum alloy flat wire. Compared with copper flat wire of the same volume, the weight of aluminum flat wire and aluminum alloy flat wire can be greatly reduced, thereby greatly reducing the weight of the stator and contributing to the lightweight development of motors.

[0039] The winding W has three phases, forming 8 poles. The core C has 48 slots, with 2 winding slots per pole per phase. In this embodiment, the number of conductor layers formed in each slot is 8. Each phase winding includes 4 branches.

[0040] In this embodiment, each branch is wound in the form of a continuous wave winding. For example, referring to Figures 2, 3, and 4, the winding of each branch is formed by repeatedly bending a long conductor in a wave shape and coiling it circumferentially to form a cage-like winding. After the winding is formed, it can be temporarily deformed radially inward to be embedded entirely into the winding slot, or it can be embedded into the slot from the inner circumference of the stator core to form the stator assembly of the required multiphase motor.

[0041] Because the branch is a continuous wave winding, there are no welding points within the branch, which reduces welding resistance. It also reduces the height of the winding's end protruding from the core S, resulting in a smaller axial space occupied by the winding. This reduced end height further lowers the winding's DC resistance, thus reducing motor losses and improving motor operating efficiency. Simultaneously, the absence of welding points within the branch significantly enhances the winding's reliability.

[0042] The four branches of each phase can be connected in parallel, as shown in case (i) of Figure 5. This connection method is particularly suitable for high-voltage platforms (e.g., 800V) and asynchronous motors. The four branches of each phase can also be connected in a mixed configuration, as shown in case (ii) of Figure 5. Every two branches are connected in series to form a small branch, and the two small branches are connected in parallel. This configuration is more suitable for low-voltage platforms (e.g., 400V). It is worth noting that the three phases in cases (i) and (ii) of Figure 5 are connected in a star configuration. This is only for illustration, and this application does not limit the connection method between the three-phase windings.

[0043] Referring to Figures 6 and 7, the stator winding method of this application is introduced using one phase (e.g., phase U) winding as an example. The routing of the windings of other phases can be obtained by circumferentially shifting the routing position of the phase U winding.

[0044] In Figures 6 and 7, the 8 rows represent the 8 layers within the slots, and the 48 columns represent the 48 cable slots. The wiring order of the 4 branches is marked with the letters a, b, c, and d followed by numbers.

[0045] As can be seen from Figures 6 and 7, the flat wire winding of each phase occupies two consecutive winding slots at each pole. For example, in this embodiment, the winding of phase U occupies slots 1 to 2 at the first pole, slots 7 and 8 at the second pole, and so on, occupying slots 43 and 44 at the eighth pole.

[0046] Looking at a single branch, the windings of each branch continuously cross layers between layers 1 and 8, traversing all poles circumferentially. As shown in Figure 7, taking branch a as an example, following the winding sequence, a1 is in layer 1, a2 crosses to layer 2, a3 crosses to layer 3, and so on until a8 crosses to layer 8, with all eight poles traversed in the first direction. Then, branch a undergoes a same-layer fold in layer 8, such as a8 and a9 both being located in layer 8. Next, a10 crosses to layer 7, a11 crosses to layer 6, and so on until a16 crosses to layer 1, with all eight poles traversed in the second direction, which is opposite to the first direction. Then, branch a undergoes a same-layer fold in layer 1, such as a16 and a17 both being located in layer 1. Next, a18 crosses to layer 2, a19 crosses to layer 3, and so on until a24 crosses to layer 8, with all eight poles traversed in the first direction. Then, branch a makes a same-level fold at level 8, for example, a24 and a25 are both located at level 8. Next, a26 crosses to level 7, a27 crosses to level 6, and so on until a32 crosses to level 1. All 8 poles are traversed in the second direction. At this point, branch a has completed 4 circumferential traversals of each pole.

[0047] As shown in Figure 7, the spacing between adjacent slots embedded between a16 and a17 is 5, and the spacing between adjacent slots embedded between other layers is 6.

[0048] The flat wire winding of each phase occupies two consecutive winding slots in each pole, which are the first type of slot and the second type of slot, as shown in Figure 6. The slots 1 and 2 occupied by the first pole are defined as the first type of slot, and the slot 2 on the right is the second type of slot.

[0049] As shown in Figure 7, taking branch a as an example, the winding slots of adjacent poles in the winding that is folded back at the same level in the 8th layer are of the same type, such as a8 and a9 being the first slots, and a24 and a25 being the second slots. However, the winding slots of adjacent poles in the winding that is folded back at the same level in the 1st layer of branch a are of different types, such as a16 being the first slot and a17 being the second slot.

[0050] This wiring method ensures that the outgoing and incoming ends of each branch are located in the outermost radial layer, or that the outgoing and incoming ends of each branch are located in the innermost radial layer. As shown in Figure 7, the incoming end a1 and the outgoing end a32 of branch a are both located in the first layer. This arrangement facilitates the layout of busbars and outgoing lines.

[0051] In this embodiment, each branch occupies 4 winding positions per layer, and 2 winding positions in each slot belong to the same branch. This winding method gives the flat wire motor a completely symmetrical structure on the magnetic circuit, which can eliminate circulating current caused by the asymmetrical structure, eliminate the problem of circulating current heating, and thus improve the service life of the motor.

[0052] The second embodiment addresses the issue that the winding W in the first embodiment is made of aluminum. During testing, the inventors of this application discovered that the heat generation of the aluminum winding W is significantly higher than that of the copper winding W. Traditional methods for cooling the stator core S are insufficient to effectively dissipate the heat from the aluminum winding W. Based on this technical problem, the inventors of this application conceived the technical solution of this embodiment. Referring to Figures 8 to 16, the stator of a flat wire motor according to one embodiment of this application is described below. The second embodiment is a variation of the first embodiment. Components with the same or similar structure or function as those in the first embodiment are labeled with the same reference numerals, and specific descriptions of these components are omitted.

[0053] In this embodiment, the stator of the flat wire motor includes a lead bus 10 and a busbar 20 located at the end of the stator core S, and both the lead bus 10 and the busbar 20 are connected to multiple connection terminals 30. In this embodiment, the continuous wave winding of each branch in the stator of the flat wire motor is a hollow flat wire 40.

[0054] As shown in Figures 11 and 12, the hollow flat wire 40 includes a core 41, an insulating layer 42, and a cooling channel 43. The cooling channel 43 is formed in the core 41, and the insulating layer 42 surrounds the outer peripheral wall of the core 41. The cross-section of the core 41 is approximately rectangular. The core 41 includes a first core 41a and a second core 41b. The cooling channel 43 is formed in the second core 41b, and the second core 41b surrounds the outer peripheral wall of the first core 41a.

[0055] In this embodiment, the first core 41a is made of copper, and the second core 41b is made of aluminum. Those skilled in the art understand that the degree of skin effect is directly related to the frequency of the current; the higher the frequency, the more pronounced the skin effect, and the more concentrated the current is on the surface of the conductor. Aluminum has a lower conductivity than copper. Therefore, by enclosing the first core 41a with the second core 41b, the skin effect of the hollow flat wire 40 during high-frequency operation can be reduced, thereby lowering the AC resistance.

[0056] Furthermore, the hollow flat wire 40 has a cooling channel 43 formed in it. The flow of coolant can directly remove the heat generated by the hollow flat wire 40, which can improve the heat dissipation performance of the flat wire winding and help improve the efficiency of the motor.

[0057] As shown in Figures 11 and 12, in this embodiment, the first core 41a, the second core 41b, and the cooling channel 43 are concentrically arranged. This arrangement reduces the manufacturing difficulty of the hollow flat wire 40 and helps to reduce its manufacturing cost. In this embodiment, while ensuring cooling effect, manufacturing efficiency is also required. Therefore, the width of the cooling channel 43 is not less than 1.5mm and not more than 2.5mm, and the thickness of the cooling channel 43 is not less than 1mm and not more than 2mm. To ensure the formation of the cooling channel 43 and to minimize copper usage, the width of the first core 41a is not less than 3mm and not more than 5mm, and the thickness of the first core 41a is not less than 2mm and not more than 4mm.

[0058] Of course, in other embodiments, the first core 41a, the second core 41b and the cooling channel 43 may not be concentric. For example, the cooling channel 43 may be closer to one side wall of the hollow flat wire 40. This arrangement can further reduce the skin effect of the hollow flat wire 40 when it is operating at high frequency.

[0059] As shown in Figure 12, the core 41 also includes a limiting clamp 41c made of the same material as the first core 41a. The limiting clamp 41c is fitted onto the outer peripheral wall and axial end wall of the end of the second core 41b. The limiting clamp 41c is integrally formed with the first core 41, thereby protecting the end of the second core 41b. When the motor is in operation, the temperature of the hollow flat wire 40 rises. Due to the different coefficients of thermal expansion of aluminum and copper, there will be a significant difference in the degree of expansion between the first core 41a and the second core 41b. By setting the limiting clamp 41c to be integrally formed with the first core 41, the separation of the first core 41a and the second core 41b due to the different degrees of expansion can be prevented.

[0060] In this embodiment, as shown in Figure 12, the axial length of the limiting clamp 41c is greater than the axial length of the hollow flat wire 40 protruding from the stator core S, so that the free end of the limiting clamp 41c is located inside the winding groove. During the expansion of the hollow flat wire 40 due to temperature rise, the sidewall of the winding groove can limit the limiting clamp 41c, which helps to further improve the reliability of the hollow flat wire 40 under high-temperature conditions.

[0061] In this embodiment, the lead bus 10 and the busbar 20 are fixedly connected, but there is no electrical connection between them. This arrangement facilitates the assembly and welding of both to the stator winding W. Of course, those skilled in the art can, according to actual needs, set the lead bus 10 and the busbar 20 to be unconnected to each other.

[0062] Both the outgoing line 10 and the busbar 20 are connected to multiple connecting terminals 30. The number of connecting terminals 30 matches the number of branches in the winding W, as shown in Figures 13 and 14. In this embodiment, both the outgoing line 10 and the busbar 20 are equipped with 12 connecting terminals 30.

[0063] Both the outlet busbar 10 and the busbar 20 have annular flow channels formed in their annular bodies. For distinction, the annular flow channel in the outlet busbar 10 is defined as the first flow channel 11, and the annular flow channel in the busbar 20 is defined as the second flow channel 21. The first flow channel 11 is connected to the cooling channels of all outlet ends of the winding W, and the second flow channel 21 is connected to the cooling channels of all inlet ends of the winding W. In the first flow channel 11 and the second flow channel 21, one flow channel is responsible for guiding the coolant flowing from the cooling system into the hollow flat wires 40 of each branch of the winding W. The coolant flowing through the hollow flat wires 40 will flow into the other flow channel and then be transported back to the cooling system, thereby realizing the circulation of the coolant.

[0064] The annular bodies of the outlet busbar 10 and busbar 20 are injection molded from insulating material. Before injection molding, the connecting terminal 30 is placed in the mold, thereby enabling the connection between the annular body and the connecting terminal 30 during injection molding. In this embodiment, since the annular body is injection molded from insulating material, the amount of copper used in the outlet busbar 10 and busbar 20 can be reduced, significantly reducing the manufacturing cost and weight of the outlet busbar 10 and busbar 20.

[0065] Those skilled in the art will understand that the connecting terminal 30 and the annular body can also be connected by bolts. This method facilitates the separate manufacturing of the connecting terminal 30 and the annular body.

[0066] As shown in Figures 15 and 16, the connecting terminal 30 includes a wire hole 31 for connecting to an external wire. The interior of the connecting terminal 30 forms a flow channel 32 for coolant flow, which communicates with an annular flow channel. As shown in Figure 16, the flow channel 32 is L-shaped.

[0067] The end of the flow channel 32 away from the annular flow channel has a connecting hole 33 for the hollow flat wire 40 to pass through. After the free end of the hollow flat wire 40 is inserted into the connecting hole 33, the flow channel 32 and the cooling channel 43 of the hollow flat wire 40 are connected, thereby realizing the connection between the cooling channel 43 and the annular flow channel.

[0068] In this embodiment, the connecting hole 33 is located on the side of the connecting terminal 30 facing the stator core S, which facilitates the connection between the connecting terminal 30 and the hollow flat wire 40, helps to reduce the overall length of the hollow flat wire 40, and helps to reduce manufacturing costs.

[0069] As shown in Figures 13 and 14, to avoid interference between the connecting terminals 30, the wire holes 31 of each connecting terminal 30 in the output busbar 10 are located on the outer periphery of the annular body. In the busbar 20, the wire holes 31 of each connecting terminal 30 are located on the inner periphery of the annular body.

[0070] In this embodiment, the connecting hole 33 is welded to the limiting clamp 41c. Since the limiting clamp 41c is made of copper, the connecting terminal 30 is also made of copper. This ensures the reliability of the welding between the hollow flat wire 40 and the connecting terminal 30.

[0071] In this embodiment, the material used to manufacture the second core 41b can be either pure aluminum (referring to metallic aluminum with an aluminum content of 99.00% or higher) or aluminum alloy. Those skilled in the art can choose according to actual needs.

[0072] The third embodiment, with reference to FIG17, describes a stator of a flat wire motor according to one embodiment of the present application. This embodiment is a variation of the second embodiment; components with the same or similar structure or function as those in the second embodiment are labeled with the same reference numerals, and specific descriptions of these components are omitted.

[0073] In this embodiment, the core 41 of the hollow flat wire 40 is made of aluminum. This helps to reduce the weight and manufacturing cost of the hollow flat wire 40.

[0074] To ensure the reliability of the welding between the hollow flat wire 40 and the outlet busbar 10, the busbar 20, and the guide member 30, in this embodiment, the connecting terminal 30 is also made of aluminum, thereby avoiding copper-aluminum welding.

[0075] It should be understood that the above-described embodiments and some aspects or features thereof can be appropriately combined.

[0076] This application has at least one of the following advantages: (i) the stator winding structure of the flat wire motor according to this application is simple and the end size is small, which reduces the DC resistance of the winding, reduces motor loss, and improves motor operating efficiency. Moreover, there are no welding points in the flat wire of each branch, which can improve the reliability of the winding.

[0077] (ii) The stator windings of the flat wire motor of this invention are made of aluminum, which can greatly reduce the weight of the stator and is conducive to the lightweight development of the motor.

[0078] (iii) By setting a second core to wrap the first core, the skin effect of the hollow flat wire at high frequency can be reduced, thereby reducing the AC resistance.

[0079] (iv) Cooling channels are formed in the hollow flat wire, and the heat generated by the hollow flat wire can be directly removed by the flow of coolant, which can improve the heat dissipation performance of the flat wire winding and help improve the efficiency of the motor.

[0080] (v) By setting a limiting hoop integrally formed with the first core, the separation of the first core and the second core due to different degrees of expansion can be prevented.

[0081] Of course, this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the above-described embodiments of this application under the guidance of this application, without departing from the scope of this application.

[0082] For example, the first core 41a is made of aluminum and the second core 41b is made of copper. This arrangement can improve the compressive strength of the hollow flat wire 40 and help reduce manufacturing costs.

Claims

1. A stator for a flat wire motor, comprising a stator core and flat wire windings, wherein the stator core has 48 winding slots, the flat wire windings have 8 poles, the flat wire windings have three phase windings, the stator core has 2 winding slots per pole per phase, and the flat wire windings form an even number L in the winding slots that is greater than 2, characterized in that... Each phase of the flat wire winding includes four branches, each branch is wound in the form of a continuous wave winding, and the flat wire winding is made of aluminum; the winding of each branch is continuously interlaced across layers between the first layer and the Lth layer and traverses each pole in the circumferential direction; the spacing between adjacent slots embedded between the outermost or innermost radial layers of each branch winding is 5, and the spacing between adjacent slots embedded between other layers is 6.

2. The stator of the flat wire motor according to claim 1, characterized in that, In each of the branch windings, before crossing from the Lth layer to the (L-1)th layer, a same-layer turn-back is performed on the Lth layer, and before crossing from the 1st layer to the 2nd layer, a same-layer turn-back is performed on the 1st layer.

3. The stator of the flat wire motor according to claim 2, characterized in that, The flat wire winding of each phase occupies two consecutive winding slots at each pole, which are respectively the first type of slot and the second type of slot; the winding slots of adjacent poles in which the winding is folded back in the Lth layer are of the same type of slot, and the winding slots of adjacent poles in which the winding is folded back in the 1st layer are of different types of slot; or, the winding slots of adjacent poles in which the winding is folded back in the 1st layer are of the same type of slot, and the winding slots of adjacent poles in which the winding is folded back in the Lth layer are of different types of slot.

4. The stator of the flat wire motor according to claim 1, characterized in that, The outgoing and incoming ends of each branch are located in the outermost radial layer, or the outgoing and incoming ends of each branch are located in the innermost radial layer.

5. The stator of the flat wire motor according to claim 1, characterized in that, The four branches are connected in parallel, or, every two branches of the four branches are connected in series to form a small branch, and the two small branches are connected in parallel.

6. The stator of the flat wire motor according to claim 1, characterized in that, Each of the branch circuits has a continuous wave winding that is a hollow flat wire, the hollow flat wire comprising a core having cooling channels and an insulating layer covering the core, the core being made of aluminum.

7. The stator of the flat wire motor according to claim 6, characterized in that, The core includes a first core and a second core. The first core is a hollow copper wire. The second core covers the outer peripheral wall of the first core. The material of the second core is aluminum.

8. The stator of the flat wire motor according to claim 7, characterized in that, The core also includes a limiting hoop, which is sleeved on the outer peripheral wall of the end of the second core; the limiting hoop and the first core are made of the same material and are integrally formed.

9. The stator of the flat wire motor according to claim 8, characterized in that, One end of the limiting clamp is connected to the first core, and the other end extends into the winding groove.

10. The stator of the flat wire motor according to claim 6, characterized in that, One end of the stator core is provided with a lead bus and a busbar. Both the lead bus and the busbar include an annular body, and the annular body includes an annular flow channel. Each annular body is connected to multiple connecting terminals. The connecting terminals form a flow guiding channel and a connecting hole for the hollow flat wire to pass through. The flow guiding channel is connected to both the annular flow channel and the cooling channel. The connecting terminals are made of the same material as the welded joints of the hollow flat wire.

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