A stator structure using a flat wire winding

Abstract

This application relates to the technical field of motors, and specifically discloses a stator structure using a flat wire winding, which includes an iron core; a coil; a PCB board; and two skeletons, which are respectively located on both sides of the iron core. The skeleton includes a mounting ring and a limiting rod. The limiting rod is arranged on the inner wall of the mounting ring along the radial direction. The limiting rod includes a supporting portion and a limiting portion. The limiting portion is fixedly connected to the end of the supporting portion away from the mounting ring, and the limiting portion has elasticity. In this application, the limiting portion is squeezed and deformed and abuts against the annular hole on the coil, thereby realizing the fixation of the coil. The coil can be fixed without using a slot wedge, reducing the process complexity and increasing the slot fill factor; the end of the coil is inserted into the jack on the PCB board and then welded and fixed to the PCB board, which can simplify the structure of the motor end; insulating materials are filled in the gaps around the coil, which can improve the assembly efficiency compared with the traditional method using insulating paper.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular, to a stator structure using a flat wire winding. Background Art

[0002] Using a flat wire winding for the motor stator can increase the slot fill factor, thereby increasing the power and torque density. The slot fill factor is an important parameter for measuring the filling degree of the coils in the motor stator slots. The slot fill factor is the ratio of the volume occupied by the coils in the stator slots to the total volume of the stator slots, usually expressed as a percentage. The higher the slot fill factor, the more fully the space in the stator slots is filled by the coils, and the higher the power density and efficiency of the motor are usually.

[0003] When assembling the stator with a flat wire winding, it is necessary to install the flat wire coils on the stator core. The stator core includes a stator yoke and stator teeth. The stator yoke is the outer circular part of the stator core, and the stator teeth are the protruding parts on the stator core, usually arranged radially. An installation slot is formed between two adjacent stator teeth, and a slot wedge is also provided at the notch of the installation slot. The slot wedge is a wedge-shaped insulating part used to firmly fix the flat wire coils in the slot to prevent the coils from moving or loosening due to electromagnetic force and mechanical vibration during operation.

[0004] During assembly, multiple flat wire coils are sequentially installed on the corresponding stator teeth, and then the slot wedges are installed to limit the flat wire coils. Since the slot wedges occupy a part of the space of the installation slots, the slot fill factor will be reduced, and the complexity of the assembly process will be increased. Therefore, how to reduce the impact on the slot fill factor while ensuring the stable installation of the flat wire coils has become an urgent technical problem to be solved. Summary of the Invention

[0005] In order to reduce the impact of the slot wedges on the slot fill factor, the present application provides a stator structure using a flat wire winding.

[0006] The stator structure using a flat wire winding provided by the present application adopts the following technical solutions:

[0007] A stator structure using a flat wire winding, including a core, including a stator yoke and a plurality of stator teeth provided on the stator yoke;

[0008] Coils, the number of the coils is the same as the number of the stator teeth, each of the coils corresponds to a stator tooth, and the coils are sleeved on the corresponding stator teeth;

[0009] A PCB board, provided on one side of the core for connecting with the ends of the coils;

[0010] There are two skeletons, which are respectively located on both sides of the iron core. The skeleton includes an installation ring and a limiting rod. The installation ring is coaxially arranged with the stator yoke. The number of the limiting rods is the same as the number of stator teeth. Each limiting rod corresponds to a stator tooth. The limiting rods are arranged on the inner wall of the installation ring in the radial direction. The side of the limiting rod close to the stator yoke is used to abut against the stator tooth. The limiting rod includes a supporting part and a limiting part. The supporting part is fixedly connected to the inner wall of the installation ring. The limiting part is fixedly connected to the end of the supporting part away from the installation ring. The limiting part has elasticity. The width of the limiting part before deformation is greater than the width of the inner ring hole of the coil. After the coil is sleeved outside the stator teeth and the limiting rods, the limiting part is squeezed and deformed and abuts against the inner ring hole of the coil.

[0011] By adopting the above technical solution, the limiting part of the limiting rod has elasticity and the width before deformation is greater than the width of the inner ring hole of the coil. After the coil is sleeved outside the stator teeth and the limiting rods, the limiting part is squeezed and deformed and abuts against the inner ring hole of the coil, so as to realize the fixation of the coil. It is not necessary to use a slot wedge to fix the coil, which reduces the process complexity and improves the slot fill factor. In addition, the limiting rod abuts against the end of the stator tooth, which can limit the axial movement of the coil relative to the stator core, further enhancing the stability of the coil and preventing the coil from moving or loosening due to electromagnetic force and mechanical vibration during operation. Since the limiting part has elasticity, it can abut and fix flat wire windings with different wire diameters, and has stronger adaptability.

[0012] Optionally, a perforation is provided at the connection between the limiting part and the supporting part.

[0013] By adopting the above technical solution, the perforation can improve the elastic deformation ability of the limiting part, make the limiting part more flexible when being squeezed and deformed, contribute to better abutting against the inner ring hole of the coil, and enhance the fixing effect on the coil. In addition, providing a perforation at the connection between the limiting part and the supporting part can reduce the overall weight of the limiting rod, thereby reducing the material cost and the inertia of the overall structure.

[0014] Optionally, the width of the supporting part is greater than the thickness of the stator tooth, so that a gap for filling insulating material is formed between the stator yoke, the stator tooth, the supporting parts at both ends of the stator tooth and the inner ring hole of the coil.

[0015] By adopting the above technical solutions, the insulation performance of the stator structure can be effectively improved, electromagnetic interference can be reduced, and unnecessary losses or short - circuit risks caused by direct contact between the coil and the stator teeth can be prevented; the filled insulating material can also completely fix the position of the coil and enhance the structural stability; in addition, during the operation of the motor, due to the temperature rise, components such as the coil and the stator teeth will undergo thermal expansion. Due to the existence of gaps, the filled insulating material can buffer the stress generated by thermal expansion to a certain extent, avoiding damage caused by excessive extrusion between the coil and the stator teeth due to thermal expansion.

[0016] Optionally, a guiding block is fixedly connected to the mounting ring, and a guiding groove for the guiding block to slide into is formed on the inner wall of the stator yoke.

[0017] By adopting the above technical solutions, the cooperation between the guiding block and the guiding groove can achieve the rapid positioning and installation between the skeleton and the iron core, improving the assembly efficiency; it also helps to ensure the coaxiality between the skeleton and the iron core, thereby enhancing the stability and reliability of the overall structure.

[0018] Optionally, the length of the guiding block is greater than the thickness of the mounting ring. The guiding block is centrally arranged on the mounting ring. A guiding post is fixedly connected to the guiding block on the side close to the PCB board. A guiding hole for the guiding post to insert into is formed on the PCB board; a jack for the end of the coil to insert into is formed on the PCB board, and the end of the coil and the jack on the PCB board are welded and fixed.

[0019] By adopting the above technical solutions, the cooperation between the guiding post and the guiding hole further improves the assembly stability between the skeleton and the PCB board, ensuring the reliability of the structure; after the end of the coil passes through the jack on the PCB board and is welded and fixed to the PCB board, it not only simplifies the connection process but also improves the stability of the electrical connection, thereby enhancing the performance and service life of the overall stator structure.

[0020] Optionally, a support ring is arranged between the PCB board and the mounting ring. The support ring is fixedly connected to the PCB board. The support ring is coaxially arranged with the mounting ring. An annular hole for the end of the coil to insert into is coaxially formed on the support ring. A connecting component is arranged on the support ring. The number of the connecting components is adapted to the number of the coils. Each connecting component corresponds to a coil. The connecting component includes a conductive post, a conductive sheet, and an abutting member. The conductive post is fixedly connected between the PCB board and the conductive sheet. The conductive sheet is attached to the inner wall of the annular hole. The abutting member is arranged between the conductive sheet and the end of the coil, and the abutting member is used to tightly abut the end of the coil against the conductive sheet.

[0021] By adopting the above technical solution, a stable conduction path is formed between the conductive posts and the conductive sheets in the connection component, ensuring the reliability of current transmission; the function of the abutting component is to firmly press the end of the coil against the conductive sheet, thereby improving the welding quality and enhancing the electrical performance and mechanical stability of the overall structure; since the position of the coil is roughly fixed by the stator teeth, the end of the coil can only move within a small range. Therefore, during the installation of the support ring, with the cooperation of the annular hole and the abutting component, the ends of the coils can be inserted into the annular holes, and then the ends of the coils are abutted against the conductive sheets by the abutting component, facilitating the smooth progress of the subsequent welding process; that is, the cooperation of the annular hole and the abutting component enables the quick connection of the coil ends to be completed even if the installation positions of each coil are different and the ends of the coils are slightly deformed, without the need to adjust each coil in sequence to align the ends of the coils with the jacks on the PCB board, thus helping to improve the assembly efficiency; in addition, since the abutting component and the annular hole are provided on the support ring, there is no need to make a large cut-out design for the PCB board, which helps to ensure the integrity of the PCB board function.

[0022] Optionally, a ring-shaped cavity is provided inside the support ring, and an air pipe is fixedly connected to the support ring. One end of the air pipe communicates with the cavity, and the other end of the air pipe is used to connect to a gas source. The abutting component includes a connecting pipe and a connecting sheet. The connecting pipe is slidably connected to the inner wall of the cavity along the radial direction of the support ring. One end of the connecting pipe is located inside the cavity and is open, and the other end of the connecting pipe is located in the annular hole and is closed. The end of the connecting pipe located in the annular hole is fixedly connected to the connecting sheet, so that when the cavity is inflated through the air pipe, the connecting pipe slides to the side away from the cavity and drives the connecting sheet to slide until the connecting sheet abuts the end of the coil against the conductive sheet and welds and fixes the end of the coil between the conductive sheet and the connecting sheet.

[0023] By adopting the above technical solution, the sliding of the connecting pipe can be driven by gas pressure, thereby driving the connecting sheet to slide and abut the end of the coil against the conductive sheet; this design not only realizes the automatic positioning and clamping of the coil end, but also improves the stability during welding and fixing, ensuring the reliability of electrical connection; during the inflation process, the end tightening and fixing of multiple coil ends can be achieved simultaneously, so the efficiency is higher; this solution simplifies the operation process, improves the assembly efficiency, and provides convenience for large-scale production; during the inflation process, the correct abutment of the coil end can also be judged by monitoring the change of air pressure. If the air pressure does not reach the expected value, it may mean that there is a problem with the component, so the assembly error can be detected and corrected in time, improving the quality control level of the production process.

[0024] Optionally, a branch pipe is fixedly connected to the support ring. One end of the branch pipe communicates with the cavity, and the other end of the branch pipe is threadedly connected with a screw cap.

[0025] By adopting the above technical solution, during the assembly process, the screw cap closes the end of the branch pipe; after the stator assembly process is completed, the screw cap is opened, and the end of the branch pipe can be opened. Therefore, the cavity inside the support ring communicates with the outside through the air pipe and the branch pipe. When air cooling is performed outside, air can circulate inside the cavity, thereby taking away the heat of the welding part, helping to enhance the heat dissipation effect, avoiding excessive concentration of heat near the welding point, and reducing the concentration of thermal stress can reduce the risk of the welding point breaking due to thermal fatigue.

[0026] Optionally, a flexible bag body is fixedly connected between one end of the connecting pipe located inside the cavity and the inner wall of the cavity.

[0027] By adopting the above technical solution, the sealing performance of the sliding connection part between the connecting pipe and the inner wall of the cavity can be enhanced, which helps to ensure the gas pressure inside the cavity, thereby ensuring the driving effect of the air pressure inside the cavity on the connecting pipe and the connecting piece.

[0028] Optionally, a spring is arranged inside the cavity. The spring is fixedly connected to the connecting pipe. The spring is in a compressed state. The spring is used to drive the connecting piece at the end of the connecting pipe to have a tendency to slide away from the cavity, so that the connecting piece presses the end of the coil against the conductive piece.

[0029] By adopting the above technical solution, the setting of the spring can provide continuous elastic force, so that the connecting piece at the end of the connecting pipe always presses the end of the coil against the conductive piece, thereby enhancing the contact stability between the end of the coil and the conductive piece and avoiding poor contact; in the way of pressing by the spring, there is no need to weld and fix the end of the coil, so the welding process of multiple coils is omitted, which helps to improve the assembly efficiency; in addition, the end of the coil is pressed between the connecting piece and the conductive piece, and the spring pressing connection has a certain elasticity, which can absorb vibration and impact, improve the reliability of the connection, and can avoid the problem that the welded connection may break due to the fatigue of the welding point in a vibrating environment; in a high-temperature environment, the welding point will generate stress due to thermal expansion, which is easy to cause the welding point to break, while the spring pressing connection can adapt to thermal expansion through the elasticity of the spring and maintain stable electrical contact; the spring pressing connection is also convenient for maintenance and replacement, reducing the maintenance time and cost.

[0030] In summary, the present application includes the following beneficial technical effects:

[0031] 1. The skeleton is provided with a limiting rod. After the coil is installed, the limiting part of the limiting rod can press against the coil to complete the fixation of the coil, and there is no need to install a slot wedge anymore. On the one hand, the assembly operation is simplified, and on the other hand, the slot filling factor can be improved.

[0032] 2. In the traditional way, the stator of the flat wire winding uses the way of turning welding for end connection. In this application, after inserting the end of the coil into the jack on the PCB board, welding can be carried out, which helps to simplify the end mechanism.

[0033] 3. The insulating material filled in the gap around the coil can enhance the insulation effect and completely fix the position of the coil, which helps to improve the stability after the coil is installed; compared with the way of inserting insulating paper on the coil, the way of filling insulating material helps to simplify the assembly operation.

[0034] 4. The setting of the support ring and the abutting component enables the end of the coil to be quickly inserted into the annular hole on the support ring even if the installation position of each coil is different and the end of the coil is slightly deformed. Then, the end of the coil is abutted against the conductive sheet through the abutting component, and then welding can be carried out, which helps to ensure the working efficiency of the assembly process; after the assembly is completed, the cavity inside the support ring can also allow air to flow, thereby accelerating the heat dissipation at the welding place and helping to enhance the heat dissipation effect.

[0035] 5. Under the action of the spring, the connecting piece abuts the end of the coil against the conductive sheet, thus completing the electrical connection. Compared with the welding method, this flexible connection method has a stronger anti-vibration effect and helps to ensure the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present application;

[0037] Figure 2 is the structural schematic diagram of another perspective of Embodiment 1 of the present application;

[0038] Figure 3 is the exploded schematic diagram of Embodiment 1 of the present application;

[0039] Figure 4 is the cross-sectional view of Embodiment 1 of the present application for showing the installation position of the limiting rod;

[0040] Figure 5 is the cross-sectional view of Embodiment 1 of the present application for showing the gap;

[0041] Figure 6 is the overall structural schematic diagram of Embodiment 2 of the present application;

[0042] Figure 7 is the structural schematic diagram of Embodiment 2 of the present application after hiding the PCB board;

[0043] Figure 8 is Figure 7 the enlarged schematic diagram at A in

[0044] Figure 9It is a cross-sectional view of Embodiment 2 of the present application;

[0045] Figure 10 is Figure 9 an enlarged schematic view of position B in

[0046] Figure 11 It is a cross-sectional view of Embodiment 3 of the present application.

[0047] Reference numerals: 1, iron core; 11, stator yoke; 111, guiding groove; 12, stator tooth; 2, coil; 3, PCB board; 31, guiding hole; 32, jack; 4, skeleton; 41, mounting ring; 411, guiding block; 4111, guiding column; 42, limiting rod; 421, supporting part; 422, limiting part; 423, perforation; 5, gap; 6, supporting ring; 61, annular hole; 62, cavity; 63, mounting hole; 7, connecting component; 71, conductive column; 72, conductive sheet; 73, abutting component; 731, connecting pipe; 732, connecting sheet; 8, air pipe; 9, branch pipe; 91, screw cap; 10, bag body; 13, spring; 14, connecting rod; 15, supporting rod; 16, sleeve. Detailed implementation manners

[0048] The following Figures 1 - 11 is a further detailed description of the present application.

[0049] Embodiment 1

[0050] The embodiment of the present application discloses a stator structure adopting a flat wire winding. Referring to Figure 1 and Figure 2 , the stator structure adopting a flat wire winding includes an iron core 1, a coil 2, a PCB board 3 and a skeleton 4. The iron core 1 includes a stator yoke 11 and stator teeth 12, and the stator yoke 11 is a circular ring structure; the stator teeth 12 are fixedly connected to the inner wall of the stator yoke 11, and a plurality of stator teeth 12 are provided and arranged in a circumferential array; each stator tooth 12 is arranged along the radial direction of the stator yoke 11. A plurality of coils 2 are provided, and the number of coils 2 is the same as the number of stator teeth 12, and each coil 2 corresponds to a stator tooth 12; the coil 2 is an enameled flat wire, and the coil 2 is provided with two ends, and the ends are used for electrically connecting with the PCB board 3. An annular hole is provided inside the coil 2, and the coil 2 is sleeved outside the corresponding stator tooth 12, and the stator tooth 12 is located in the annular hole inside the coil 2, so as to realize the positioning of the coil 2.

[0051] Referring to Figure 2 , the PCB board 3 is circular ring-shaped, and the PCB board 3 and the stator yoke 11 are coaxially arranged. A plurality of groups of jacks 32 for inserting the ends of the coil 2 are provided on the PCB board 3, and each group of jacks 32 includes two, and these two jacks 32 are used for welding and fixing with the two ends of the same coil 2, and realizing the electrical connection between the ends of the coil 2 and the PCB board 3.

[0052] Reference Figure 3 As shown in Figure 3 , the skeleton 4 is made of an insulating material. There are two skeletons 4, which are respectively located on both sides of the iron core 1. The skeleton 4 includes an installation ring 41 and a limiting rod 42. The installation ring 41 is a circular ring coaxially arranged with the stator yoke 11. The limiting rod 42 is arranged radially on the inner wall of the installation ring 41. There are a plurality of limiting rods 42 arranged in a circumferential array; the number of limiting rods 42 is the same as the number of stator teeth 12, and each limiting rod 42 corresponds to a stator tooth 12.

[0053] Reference Figure 3 and Figure 4 As shown in Figure 3 and Figure 4 , the limiting rod 42 includes a supporting portion 421 and a limiting portion 422; the supporting portion 421 is fixedly connected to the inner wall of the installation ring 41. The side of the supporting portion 421 away from the iron core 1 is an arc surface, and the side of the supporting portion 421 close to the iron core 1 is a plane. The planar structure facilitates the fitting of the supporting portion 421 with the corresponding stator tooth 12. The limiting portion 422 is fixedly connected to one end of the supporting portion 421 away from the installation ring 41. The two sides of the limiting portion 422 are convexly arranged, so that the width of the limiting portion 422 is greater than the width of the supporting portion 421. The limiting portion 422 has elasticity, and a perforation 423 is provided at the connection between the limiting portion 422 and the supporting portion 421. Therefore, the limiting portion 422 is more likely to deform after being squeezed. The width of the limiting portion 422 in the undeformed state is greater than the width of the inner ring hole of the coil 2. Therefore, after the coil 2 is installed outside the stator tooth 12, both the stator tooth 12 and the limiting rod 42 are located in the inner ring hole of the coil 2. At this time, the limiting portion 422 of the limiting rod 42 is deformed by the extrusion of the coil 2, and the deformed limiting portion 422 abuts against the inner ring hole of the coil 2, thereby preliminarily fixing the installed coil 2.

[0054] Wherein, a guiding block 411 is fixedly connected to the inner wall of the installation ring 41. There are a plurality of guiding blocks 411 arranged in a circumferential array. The guiding block 411 is a rectangular block, and the length direction of the guiding block 411 is arranged along the axial direction of the installation ring 41; the length of the guiding block 411 is greater than the thickness of the installation ring 41, and the guiding block 411 is centrally arranged on the installation ring 41. Correspondingly, a guiding groove 111 is axially opened on the inner wall of the stator yoke 11 along its own axis. The number of guiding grooves 111 is the same as the number of guiding blocks 411, and each guiding groove 111 corresponds to a guiding block 411. One end of the guiding block 411 is slidably connected to the guiding groove 111. Therefore, during the assembly process, the cooperation between the guiding block 411 and the guiding groove 111 can ensure the installation effect, so that when the end face of the installation ring 41 is attached to the end face of the stator yoke 11, the plane of the supporting portion 421 is aligned with and in contact with the end face of the corresponding stator tooth 12.

[0055] Reference Figure 2 and Figure 5, in order to enhance the fixing effect on the coil 2, the width of the supporting portion 421 is greater than the thickness of the stator tooth 12. Therefore, after the coil 2 is inserted outside the stator tooth 12, a gap 5 is formed between the stator yoke 11, the stator tooth 12, the supporting portions 421 at both ends of the stator tooth 12 and the inner annular hole of the coil 2. After all the coils 2 are inserted onto the corresponding stator teeth 12, the assembled stator structure can be immersed in insulating paint. At this time, the insulating paint can fill the gap 5 jointly formed between the stator yoke 11, the stator tooth 12, the supporting portions 421 at both ends of the stator tooth 12 and the inner annular hole of the coil 2. After the insulating paint is cured, on the one hand, it can play an insulating role to separate the coil 2 and the stator tooth 12, and on the other hand, the filled insulating paint can completely fix the position of the coil 2, thus ensuring the stability of the coil 2 after installation. After dipping in paint, the through hole 423 between the limiting portion 422 and the supporting portion 421 is also filled with paint, so the limiting portion 422 is not easily deformed, which can further ensure the limiting effect of the limiting portion 422 on the coil 2.

[0056] The width of the inner annular hole of the coil 2 is not less than the width of the supporting portion 421, which helps the smooth progress of the insertion process of the coil 2.

[0057] Refer to Figure 3 , in addition, a guide post 4111 is fixedly connected to the end of the guide block 411 on the side close to the PCB board 3. A guide hole 31 is formed on the PCB board 3. During the assembly process, the PCB board 3 is slid towards the side close to the skeleton 4, so that the guide post 4111 slides through the guide hole 31, which can play a guiding role in the installation process of the PCB board 3 and helps to ensure the installation accuracy of the PCB board 3.

[0058] In addition, the coil 2 is an enameled wire, and an insulating layer is provided on the outside of the coil 2. In order to reduce the influence on the insulation performance caused by the scratching of the insulating layer outside the coil 2 during the assembly process, the iron core 1 can be insulated first, such as electrophoresis, spraying, powder coating, dipping in paint, etc., to further improve the reliability during the assembly process of the stator assembly.

[0059] The implementation principle of Embodiment 1 is as follows: First, insulate the iron core 1; then place two skeletons 4 on both sides of the iron core 1 respectively, align the guiding blocks 411 on the skeletons 4 with the guiding grooves 111 on the stator yoke 11, and then slide the guiding blocks 411 into the guiding grooves 111 until the two skeletons 4 are respectively attached to both sides of the iron core 1. At this time, the limiting rods 42 on the skeletons 4 are in contact with the stator teeth 12 on the iron core 1, and the two limiting rods 42 are respectively in contact with both ends of the stator teeth 12. Then insert the coil 2 along the radial direction of the iron core 1 outside the corresponding stator teeth 12 until one side of the coil 2 abuts against the inner wall of the stator yoke 11; during the process of inserting the coil 2, the limiting part 422 will be deformed, and after the limiting part 422 is deformed, it abuts against the annular hole inside the coil 2, so as to realize the preliminary positioning of the coil 2 through the limiting part 422.

[0060] Insert each coil 2 in sequence. After all the coils 2 are inserted outside the corresponding stator teeth 12, place the PCB board 3 on one side close to the end of the coil 2; align the guiding holes 31 on the PCB board 3 with the guiding columns 4111 at the ends of the guiding blocks 4111, so that the guiding columns 4111 penetrate into the guiding holes 31, and then slide the PCB board 3 until one side of the PCB board 3 abuts against the guiding block 411. At this time, the PCB board 3 and the iron core 1 are arranged at intervals; then weld the end of the coil 2 to the jack 32 on the PCB board 3 to complete the electrical connection between the coil 2 and the PCB board 3, and at the same time fix the position of the PCB board 3, thus completing the installation of the PCB board 3. Then perform impregnating treatment on the assembled stator, so that the gap 5 formed between the stator yoke 11, the stator teeth 12, the supporting parts 421 at both ends of the stator teeth 12 and the inner annular hole of the coil 2 is filled with insulating material, which can not only play an insulating role but also completely fix the coil 2 on the iron core 1 and the skeleton 4, improving the stability of the coil 2 after installation.

[0061] Embodiment 2

[0062] Refer to Figure 6 and Figure 7 This embodiment is different from Embodiment 1 in that a support ring 6 is provided on one side of the PCB board 3 in this embodiment, and the support ring 6 is located between the PCB board 3 and the skeleton 4. The support ring 6 is a circular ring and is coaxially arranged with the mounting ring 41. An annular hole 61 is coaxially opened on the support ring 6; there are two annular holes 61, and the diameters of the two annular holes 61 are different; the two annular holes 61 divide the support ring 6 into three independent circular ring parts, and the adjacent two circular ring parts are fixedly connected by a support rod 15, so as to fixedly connect the three circular ring parts into a whole. One end of the coil 2 is inserted into the outer annular hole 61, and the other end of the coil 2 is inserted into the inner annular hole 61. A connection component 7 is provided on the support ring 6, and the connection component 7 is used to electrically connect the end of the coil 2 to the PCB board 3.

[0063] Referring to Figure 7 and Figure 8 , multiple sets of connecting components 7 are provided. The number of the connecting components 7 is twice the number of the coils 2. Each coil 2 corresponds to two sets of connecting components 7, and the two sets of connecting components 7 respectively correspond to the two ends of this coil 2. The connecting component 7 includes a conductive post 71, a conductive sheet 72, and an abutting member 73; one end of the conductive post 71 is welded and electrically connected to the PCB board 3, and the other end of the conductive post 71 is welded to the conductive sheet 72. The conductive sheet 72 is an arc-shaped sheet, one side of the conductive sheet 72 is attached to the inner wall of the annular hole 61, and the conductive sheet 72 is fixedly connected to the inner wall of the annular hole 61.

[0064] Referring to Figure 9 and Figure 10 , in order to facilitate the driving of the abutting member 73 to act, an annular cavity 62 is further provided inside the support ring 6, and the cavity 62 is located between the two annular holes 61. An air pipe 8 is fixedly connected to the support ring 6, one end of the air pipe 8 communicates with the inside of the cavity 62, and the other end of the air pipe 8 is located outside the support ring 6. After connecting the end of the air pipe 8 to an air pump and turning on the air pump, the air pump can fill the cavity 62 inside the support ring 6 with gas through the air pipe 8, and the filled gas can drive the abutting member 73 to act.

[0065] Referring to Figure 10 , the abutting member 73 includes a connecting pipe 731 and a connecting sheet 732. The connecting pipe 731 is a circular pipe, and the connecting pipe 731 is arranged along the radial direction of the support ring 6; the connecting pipe 731 is slidably connected to the inner wall of the cavity 62 along its own axis direction, one end of the connecting pipe 731 is located inside the cavity 62, and the end of the connecting pipe 731 located inside the cavity 62 is open; the other end of the connecting pipe 731 is located outside the cavity 62 and is located in the annular hole 61, and the end of the connecting pipe 731 located in the annular hole 61 is closed and fixedly connected to the connecting sheet 732, and the connecting sheet 732 is an arc-shaped sheet. Therefore, after the cavity 62 is inflated through the air pipe 8, the air pressure in the air increases. Under the action of the air pressure, the connecting pipe 731 will slide outward of the cavity 62, and the connecting pipe 731 drives the connecting sheet 732 to slide; since the end of the coil 2 is located between the conductive sheet 72 and the connecting sheet 732, the connecting sheet 732 can push the end of the coil 2 to move during the sliding process until the connecting sheet 732 presses the end of the coil 2 against the conductive sheet 72. Then, the welding of the end of the coil 2 is carried out, and the end of the coil 2 is welded and fixed between the conductive sheet 72 and the connecting sheet 732. Therefore, the end of the coil 2 is electrically connected to the PCB board 3 through the conductive sheet 72 and the conductive post 71, thus ensuring the smooth progress of the power-on process.

[0066] Wherein, a flexible bag body 10 is fixedly connected between one end of the connecting pipe 731 located inside the cavity 62 and the inner wall of the cavity 62. The bag body 10 is sleeved outside the connecting pipe 731, and the inside of the bag body 10 is not communicated with the inside of the connecting pipe 731. Therefore, the setting of the bag body 10 can enhance the sealing performance of the sliding connection between the connecting pipe 731 and the inner wall of the cavity 62, thereby ensuring the driving effect of the gas charged into the cavity 62 on the abutting member 73.

[0067] Therefore, during the assembly process, only the two end portions of the coil 2 need to be respectively inserted into the two annular holes 61, and then the connecting pipe 731 and the connecting piece 732 are driven to move outward by inflating, so that the connecting piece 732 can tightly abut the end portion of the coil 2 against the conductive piece 72, completing the quick connection of the end portion of the coil 2, and then welding can be carried out. That is, the setting of the support ring 6 and the connecting component 7 can accelerate the working efficiency of the connection process of the coil 2. Even if the installation position of each coil 2 is different, or the installation angle is different, or the end portion of the coil 2 itself is deformed, there is a large tolerance space, and the connection process of the end portion of the coil 2 can be quickly completed, thereby improving the working efficiency of the assembly process.

[0068] Refer to Figure 10 , a mounting hole 63 is formed in the support ring 6, and there are multiple mounting holes 63 which are arranged in a circumferential array. The support ring 6 and the PCB board 3 are fixedly connected through a connecting rod 14 (refer to Figure 6 ). During assembly, the mounting hole 63 on the support ring 6 is aligned with the guide post 4111 on the guide block 411, and then the support ring 6 is slid so that the guide post 4111 penetrates into the mounting hole 63 until one end of the support ring 6 abuts against the guide block 411. At this time, the installation of the support ring 6 and the PCB board 3 is completed.

[0069] A sleeve 16 is also fixedly connected inside the support ring 6. The sleeve 16 is located at the mounting hole 63. The two ends of the sleeve 16 are respectively fixedly connected to the inner walls on both sides of the cavity 62, and the inside of the sleeve 16 is not communicated with the inside of the cavity 62. The guide post 4111 slidably penetrates through the sleeve 16. Therefore, during the process of inserting the guide post 4111 into the sleeve 16, the sealing performance of the internal structure of the cavity 62 will not be affected, which helps to ensure the normal operation of the abutting member 73.

[0070] In addition, the air pump in this embodiment is a two-way air pump. Therefore, before the end of the coil 2 is tightly fixed, the gas in the cavity 62 can be pumped out through the air pipe 8. Under the action of negative pressure, the connecting pipe 731 can slide to the inside of the cavity 62, and the connecting piece 732 can be attached to the outer walls on both sides of the cavity 62. At this time, the connecting piece 732 and the corresponding conductive piece 72 in the two annular holes 61 are arranged at intervals, so it is convenient to quickly insert the end of the coil 2 into the two annular holes 61. After the end of the coil 2 is inserted into the annular hole 61, gas is injected into the cavity 62 through the air pipe 8, so that the air pressure in the cavity 62 increases, and then the connecting pipe 731 and the connecting piece 732 are driven to slide outward of the cavity 62 under the action of air pressure, so that the connecting piece 732 tightly presses the end of the coil 2 on the conductive piece 72, which is convenient for the subsequent welding process to proceed smoothly.

[0071] It should be noted that after the welding process is completed, since the end of the coil 2 and the conductive piece 72 are fixedly connected, the positions of the support ring 6 and the PCB board 3 are fixed. Since there is a gap between the PCB board 3 and the support ring 6, the welding of the end of the coil 2 at the annular hole 61 on the support ring 6 can be realized. When the stator works subsequently, it is also helpful to ensure the ventilation effect of the end of the coil 2, thereby enhancing the heat dissipation effect.

[0072] Refer to Figure 9 and Figure 10 , further, a branch pipe 9 is fixedly connected to the support ring 6. One end of the branch pipe 9 is communicated with the inside of the cavity 62, and the other end of the branch pipe 9 is located outside the support ring 6, and a screw cap 91 is threadedly connected to the end of the branch pipe 9 located outside the support ring 6. During the assembly process, the screw cap 91 closes the end of the branch pipe 9, so the gas filled into the cavity 62 through the air pipe 8 cannot be discharged, which will increase the air pressure in the cavity 62, and then the connecting pipe 731 and the connecting piece 732 will slide outward of the cavity 62 to realize the tight fixing of the end of the coil 2; after the assembly is completed, the screw cap 91 can be opened. At this time, the cavity 62 is communicated with the outside through the air pipe 8 and the branch pipe 9. Therefore, when the outside of the stator assembly is cooled by air, the flowing air can enter the cavity 62 and then be discharged, so as to take away part of the heat generated during the energization process of the welding part, and the heat dissipation effect can be enhanced.

[0073] The implementation principle of Embodiment 2 is as follows: First, insulate the iron core 1; then install the skeleton 4 on both sides of the iron core 1, insert the coil 2 onto the corresponding stator teeth 12 in sequence, and initially fix the coil 2 through the deformed limiting part 422. Connect the end of the air pipe 8 to the air pump, turn on the air pump, and the air pump extracts the gas in the cavity 62 through the air pipe 8. Under the action of negative pressure, the connecting pieces 732 in the two annular holes 61 are both on the side away from the conductive piece 72. Then install the support ring 6 on one side of the skeleton 4, the PCB board 3 is on the side of the support ring 6 away from the skeleton 4, and the two ends of the coil 2 are respectively inserted into the two annular holes 61.

[0074] Then the air pump injects gas into the cavity 62 through the air pipe 8 again, increasing the air pressure in the cavity 62. Therefore, under the action of air pressure, the connecting pipe 731 can slide towards the outside of the cavity 62, and the connecting pipe 731 drives the connecting piece 732 at its end to slide until the connecting piece 732 presses the end of the coil 2 against the conductive piece 72. After all the ends of the coil 2 are pressed tightly, the welding of the ends of the coil 2 can be carried out. After the welding is completed, disconnect the connection between the air pump and the air pipe 8, and just open the rotary cover 91. At this time, the cavity 62 is communicated with the outside through the air pipe 8 and the branch pipe 9. During the subsequent power-on operation, air can flow inside the cavity 62, thus accelerating heat dissipation.

[0075] Embodiment 3

[0076] Refer to Figure 11 , the difference between this embodiment and Embodiment 2 is that a spring 13 is arranged inside the cavity 62 in this embodiment, and the number of springs 13 is the same as the number of connecting pipes 731. The spring 13 is fixedly connected between the closed end of the connecting pipe 731 and the inner wall of the cavity 62, and the spring 13 is in a compressed state. Therefore, the spring 13 makes the connecting pipe 731 tend to slide towards the outside of the cavity.

[0077] During the assembly process, in the initial state, the spring 13 makes the connecting piece 732 press tightly against the corresponding conductive piece 72; then connect the air pipe 8 to the vacuum pump, turn on the vacuum pump, and the vacuum pump extracts the gas in the cavity 62 through the air pipe 8. Therefore, during the process of evacuating the cavity 62, the connecting pipe 731 will overcome the elastic force of the spring 13 and slide towards the inside of the cavity 62, making the connecting pipe 731 drive the connecting piece 732 to slide, and the connecting piece 732 is separated from the contact with the conductive piece 72. Then, install the support ring 6 on one side of the skeleton 4 so that the end of the coil 2 is inserted into the corresponding annular hole 61; then stop evacuating, disconnect the connection between the vacuum pump and the air pipe 8, and under the action of the restoring force of the spring 13, the connecting pipe 731 slides towards the outside of the cavity 62, and the connecting pipe 731 drives the connecting piece 732 to slide, making the connecting piece 732 press the end of the coil 2 tightly against the corresponding conductive piece 72, thereby realizing the electrical connection of the ends of the coil 2.

[0078] After the spring 13 causes the connecting piece 732 to tightly press against the end of the coil 2, there is no need to weld the end of the coil 2. Therefore, while ensuring the normal function of the stator, the welding process of multiple coils 2 can be omitted, which helps to simplify the operation and thus improve the assembly efficiency.

[0079] In addition, it should be noted that after the spring 13 causes the connecting piece 732 to tightly press against the end of the coil 2, since the end of the coil 2 and the conductive piece 72 are fixedly connected, the positions of the support ring 6 and the PCB board 3 are fixed.

[0080] Furthermore, in this embodiment, the support ring 6 includes a cover plate at the edge and a cylindrical housing. The cover plate and the housing are detachably connected, so it is convenient to process the internal structure of the support ring 6. When it is damaged, it is also convenient to disassemble the cover plate and then replace the internal structure.

[0081] The above are the optional embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A stator structure using a flat wire winding, characterized in that, Comprising: A core (1), including a stator yoke (11) and a plurality of stator teeth (12) arranged on the stator yoke (11); Coils (2), the number of the coils (2) being the same as the number of the stator teeth (12), each coil (2) corresponding to one stator tooth (12), and the coil (2) being sleeved on the corresponding stator tooth (12); A PCB board (3), arranged on one side of the core (1) for connecting to the end of the coil (2); Two skeletons (4), respectively located on both sides of the core (1), the skeleton (4) including a mounting ring (41) and a limiting rod (42), the mounting ring (41) being coaxially arranged with the stator yoke (11), the number of the limiting rods (42) being the same as the number of the stator teeth (12), each limiting rod (42) corresponding to one stator tooth (12), the limiting rod (42) being arranged on the inner wall of the mounting ring (41) in the radial direction, the side of the limiting rod (42) close to the stator yoke (11) being used to abut against the stator tooth (12), the limiting rod (42) including a supporting part (421) and a limiting part (422), the supporting part (421) being fixedly connected to the inner wall of the mounting ring (41), the limiting part (422) being fixedly connected to the end of the supporting part (421) away from the mounting ring (41), the limiting part (422) having elasticity, and the width of the limiting part (422) before deformation being greater than the width of the inner ring hole of the coil (2), so that after the coil (2) is sleeved outside the stator tooth (12) and the limiting rod (42), the limiting part (422) is squeezed and deformed and abuts against the inner ring hole of the coil (2).

2. The stator structure with a flat wire winding according to claim 1, characterized in that: A through hole (423) is formed at the connection between the limiting part (422) and the supporting part (421).

3. The stator structure with a flat wire winding according to claim 1, characterized in that: The width of the supporting part (421) is greater than the thickness of the stator tooth (12), so that a gap (5) for filling an insulating material is formed between the stator yoke (11), the stator teeth (12), the supporting parts (421) at both ends of the stator teeth (12) and the inner ring hole of the coil (2).

4. A stator structure with a flat wire winding according to claim 1, characterized in that: A guiding block (411) is fixedly connected to the mounting ring (41), and a guiding groove (111) for the guiding block (411) to slide into is formed on the inner wall of the stator yoke (11).

5. A stator structure with a flat wire winding according to claim 4, characterized in that: The length of the guiding block (411) is greater than the thickness of the mounting ring (41), the guiding block (411) is centrally arranged on the mounting ring (41), a guiding column (4111) is fixedly connected to the guiding block (411) on the side close to the PCB board (3), and a guiding hole (31) for the guiding column (4111) to insert into is formed on the PCB board (3); a jack (32) for the end of the coil (2) to insert into is formed on the PCB board (3), and the end of the coil (2) and the jack (32) of the PCB board (3) are fixedly connected by welding.

6. The stator structure with a flat wire winding according to claim 1, characterized in that: A support ring (6) is provided between the PCB board (3) and the mounting ring (41). The support ring (6) is fixedly connected to the PCB board (3). The support ring (6) is coaxially arranged with the mounting ring (41). An annular hole (61) for the end of the coil (2) to be inserted is coaxially formed on the support ring (6). A connecting component (7) is arranged on the support ring (6). The number of the connecting components (7) is adapted to the number of the coils (2). Each connecting component (7) corresponds to a coil (2). The connecting component (7) includes a conductive column (71), a conductive sheet (72) and an abutting component (73). The conductive column (71) is fixedly connected between the PCB board (3) and the conductive sheet (72). The conductive sheet (72) is attached to the inner wall of the annular hole (61). The abutting component (73) is arranged between the conductive sheet (72) and the end of the coil (2). The abutting component (73) is used to tightly abut the end of the coil (2) against the conductive sheet (72).

7. A stator structure with a flat wire winding according to claim 6, characterized in that: A ring-shaped cavity (62) is arranged inside the support ring (6). An air pipe (8) is fixedly connected to the support ring (6). One end of the air pipe (8) is communicated with the cavity (62). The other end of the air pipe (8) is used to be connected to a gas source. The abutting component (73) includes a connecting pipe (731) and a connecting piece (732). The connecting pipe (731) is slidably connected to the inner wall of the cavity (62) along the radial direction of the support ring (6). One end of the connecting pipe (731) is located inside the cavity (62) and is open. The other end of the connecting pipe (731) is located in the annular hole (61) and is closed. The end of the connecting pipe (731) located in the annular hole (61) is fixedly connected to the connecting piece (732). When the cavity (62) is inflated through the air pipe (8), the connecting pipe (731) slides towards the side away from the cavity (62) and drives the connecting piece (732) to slide until the connecting piece (732) tightly abuts the end of the coil (2) against the conductive sheet (72), and the end of the coil (2) is welded and fixed between the conductive sheet (72) and the connecting piece (732).

8. A stator structure using a flat wire winding according to claim 7, characterized in that: A branch pipe (9) is fixedly connected to the support ring (6). One end of the branch pipe (9) is communicated with the cavity (62). The other end of the branch pipe (9) is threadedly connected with a screw cap (91).

9. A stator structure using a flat wire winding according to claim 7, characterized in that: A flexible bag body (10) is fixedly connected between the end of the connecting pipe (731) located in the cavity (62) and the inner wall of the cavity (62).

10. A stator structure with a flat wire winding according to claim 7, characterized in that: A spring (13) is arranged inside the cavity (62). The spring (13) is fixedly connected to the connecting pipe (731). The spring (13) is in a compressed state. The spring (13) is used to drive the connecting piece (732) at the end of the connecting pipe (731) to have a tendency to slide towards the side away from the cavity (62), so that the connecting piece (732) tightly abuts the end of the coil (2) against the conductive sheet (72).

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