Stator structure adopting flat wire winding

Abstract

The invention relates to the technical field of motors, and particularly discloses a stator structure adopting a flat wire winding, which comprises an iron core, a coil; a PCB (printed circuit board); the two frameworks are located on the two sides of the iron core respectively, each framework comprises an installation ring and a limiting rod, the limiting rods are arranged on the inner wall of the installation ring in the radial direction, each limiting rod comprises a supporting part and a limiting part, the limiting parts are fixedly connected to the ends, away from the installation rings, of the supporting parts, and the limiting parts are elastic. The limiting part is extruded to deform and abuts against the ring hole in the coil, so that the coil is fixed, the coil can be fixed without using a slot wedge, the process complexity is reduced, and the slot fullness rate is improved; the end part of the coil is inserted into the jack on the PCB and then is welded and fixed with the PCB, so that the end part structure of the motor can be simplified; the gaps around the coil are filled with the insulating materials, and compared with a traditional mode of adopting insulating paper, the assembling efficiency can be improved.

Description

Technical Field

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

[0002] The use of flat wire windings in motor stators can increase the slot fill rate, thereby increasing power and torque density. The slot fill rate is an important parameter to measure the degree of coil filling in the motor stator slots. The slot fill rate refers to the ratio of the volume occupied by the coil in the stator slot to the total volume of the stator slots, usually expressed as a percentage. The higher the slot fill rate, the more fully the space in the stator slot is filled with coils, and the higher the power density and efficiency of the motor are usually.

[0003] When assembling a stator with flat wire winding, the flat wire coil needs to be installed on the stator core. The stator core includes a stator yoke and stator teeth. The stator yoke is the outer cylindrical 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 coil in the slot to prevent the coil 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 slot wedges are installed to limit the flat wire coils. Since the slot wedges occupy part of the installation slot space, the slot fill rate is reduced and the complexity of the assembly process is increased. Therefore, how to ensure the stable installation of the flat wire coils while reducing the impact on the slot fill rate has become a technical problem that needs to be solved urgently. Summary of the invention

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

[0006] The stator structure using flat wire windings provided in the present application adopts the following technical solution: A stator structure using a flat wire winding includes an iron core, a stator yoke and a plurality of stator teeth arranged on the stator yoke; Coils, the number of the coils is the same as the number of stator teeth, each coil corresponds to a stator tooth, and the coil is sleeved on the corresponding stator tooth; A PCB board is arranged on one side of the iron core and is used to be connected to the end of the coil; The skeleton is provided with two and is respectively located on both sides of the iron core, the skeleton includes a mounting ring and a limit rod, the mounting ring is coaxially arranged with the stator yoke, the number of the limit rods is the same as the number of stator teeth, each limit rod corresponds to a stator tooth, the limit rod is radially arranged on the inner wall of the mounting ring, the side of the limit rod close to the stator yoke is used to abut against the stator teeth, the limit rod includes a supporting part and a limit part, the supporting part is fixedly connected to the inner wall of the mounting ring, the limit part is fixedly connected to the end of the supporting part away from the mounting ring, the limit part is elastic, and the width of the limit part before deformation is greater than the width of the ring hole inside the coil, so that after the coil is sleeved on the outside of the stator teeth and the limit rod, the limit part is squeezed and deformed and abuts against the ring hole inside the coil.

[0007] By adopting the above technical scheme, the limiting part of the limiting rod is elastic and its width before deformation is greater than the width of the ring hole inside the coil. After the coil is sleeved on the stator teeth and the outside of the limiting rod, the limiting part is squeezed and deformed and pressed against the ring hole inside the coil, thereby fixing the coil. The coil can be fixed without using slot wedges, which reduces the process complexity and improves the slot fill rate. In addition, the limiting rod presses against the end of the stator tooth, which can limit the axial movement of the coil relative to the stator core, further enhances the stability of the coil, and prevents the coil from moving or loosening due to electromagnetic force and mechanical vibration during operation. Since the limiting part is elastic, it can be pressed and fixed for flat wire windings of different wire diameters, and has stronger adaptability.

[0008] Optionally, a through hole is provided at the connection between the limiting portion and the supporting portion.

[0009] By adopting the above technical solution, the perforation can improve the elastic deformation capacity of the limiting part, making the limiting part more flexible when extruded and deformed, which helps to better press against the ring hole inside the coil and enhance the fixing effect of the coil; in addition, the perforation is opened at the connection between the limiting part and the supporting part, which can reduce the overall weight of the limiting rod, thereby reducing material costs and reducing the inertia of the overall structure.

[0010] Optionally, the width of the support portion is greater than the thickness of the stator teeth, so that a gap for filling with insulating material is formed between the stator yoke, the stator teeth, the support portions at both ends of the stator teeth and the internal annular holes of the coil.

[0011] By adopting the above technical solution, 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 stability of the structure; in addition, during the operation of the motor, due to the increase in temperature, components such as the coil and stator teeth will undergo thermal expansion. Due to the existence of gaps, the filled insulating material can buffer the stress caused by thermal expansion to a certain extent, thereby avoiding excessive extrusion between the coil and the stator teeth due to thermal expansion and causing damage.

[0012] Optionally, a guide block is fixedly connected to the mounting ring, and a guide groove for the guide block to slide into is formed on the inner wall of the stator yoke.

[0013] By adopting the above technical solution, the guide block and the guide groove cooperate with each other, which can realize the rapid positioning and installation between the skeleton and the iron core, and improve the assembly efficiency; it also helps to ensure the coaxiality of the skeleton and the iron core, thereby improving the stability and reliability of the overall structure.

[0014] Optionally, the length of the guide block is greater than the thickness of the mounting ring, the guide block is centrally arranged on the mounting ring, a guide column is fixedly connected to the guide block on the side close to the PCB board, and a guide hole for inserting the guide column is provided on the PCB board; a socket for inserting the end of the coil is provided on the PCB board, and the end of the coil and the socket of the PCB board are welded and fixed.

[0015] By adopting the above technical solution, the cooperation between the guide column and the guide hole further improves the assembly stability between the frame and the PCB board, ensuring the reliability of the structure; the coil end is welded and fixed to the PCB board after passing through the jack of the PCB board, which not only simplifies the connection process, but also improves the stability of the electrical connection, thereby improving the performance and service life of the overall stator structure.

[0016] 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 and the mounting ring are coaxially arranged, an annular hole is coaxially opened on the support ring for inserting the end of the coil, a connecting component is arranged on the support ring, the number of the connecting components is adapted to the number of coils, each of the connecting components corresponds to a coil, the connecting component includes a conductive column, a conductive sheet and an abutment component, the conductive column 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 abutment component is arranged between the conductive sheet and the end of the coil, and the abutment component is used to press the end of the coil against the conductive sheet.

[0017] By adopting the above technical solution, the conductive column and the conductive sheet in the connecting component form a stable conductive path, ensuring the reliability of current transmission; the function of the abutment component is to firmly press the coil end on 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, so in the process of installing the support ring, under the cooperation of the annular hole and the abutment component, the ends of the coil can be inserted into the annular hole, and then the end of the coil is pressed against the conductive sheet by the abutment component, so as to facilitate the smooth progress of the subsequent welding process; that is, the cooperation of the annular hole and the abutment component makes it possible to quickly complete the quick connection of the coil end even if the installation position of each coil is different and the end of the coil is slightly deformed, without adjusting each coil in turn so that the end of the coil is aligned with the jack on the PCB board, which helps to improve the assembly efficiency; in addition, since the abutment component and the annular hole are arranged on the support ring, there is no need to perform a large hollow design on the PCB board, which helps to ensure the integrity of the function of the PCB board.

[0018] Optionally, an annular cavity is provided inside the support ring, an air pipe is fixedly connected to the support ring, one end of the air pipe is connected to the cavity, and the other end of the air pipe is used to connect to the air source, the abutment component includes a connecting tube and a connecting plate, the connecting tube is connected to the inner wall of the cavity by radial sliding along the support ring, one end of the connecting tube is located inside the cavity and is open, the other end of the connecting tube is located in the annular hole and is closed, and one end of the connecting tube located in the annular hole is fixedly connected to the connecting plate, so that when air is inflated into the cavity through the air pipe, the connecting tube slides to the side away from the cavity and drives the connecting plate to slide until the connecting plate presses the end of the coil against the conductive plate, and welds the end of the coil between the conductive plate and the connecting plate.

[0019] By adopting the above technical solution, the gas pressure can be used to drive the connecting tube to slide, thereby driving the connecting plate to slide and pressing the coil end against the conductive plate; this design not only realizes the automatic positioning and clamping of the coil end, but also improves the stability during welding and fixation, ensuring the reliability of the electrical connection; during the inflation process, multiple coil ends can be pressed and fixed at the same time, so the efficiency is higher; this solution simplifies the operating process, improves assembly efficiency, and provides convenience for large-scale production; during the inflation process, the changes in air pressure can also be monitored to determine whether the coil end is correctly pressed. If the air pressure does not reach the expected value, it may mean that there is a problem with the component, so that assembly errors can be discovered and corrected in time, thereby improving the quality control level of the production process.

[0020] Optionally, a branch pipe is fixedly connected to the support ring, one end of the branch pipe is communicated with the cavity, and the other end of the branch pipe is threadedly connected to a screw cap.

[0021] By adopting the above technical solution, during the assembly process, the end of the branch pipe is sealed by the screw cap; after the stator assembly process is completed, the end of the branch pipe can be opened by opening the screw cap, so that the cavity inside the support ring is connected with the outside through the air pipe and the branch pipe. When the outside is cooled by air, air can circulate inside the cavity, thereby taking away the heat of the welding part, which helps to enhance the heat dissipation effect, avoid excessive concentration of heat near the welding point, and reduce the concentration of thermal stress, which can reduce the risk of fracture of the welding point due to thermal fatigue.

[0022] Optionally, a flexible bag body is fixedly connected between one end of the connecting tube located in the cavity and the inner wall of the cavity.

[0023] By adopting the above technical solution, the sealing of the sliding connection between the connecting tube 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 gas pressure inside the cavity on the connecting tube and the connecting piece.

[0024] Optionally, a spring is provided inside the cavity, the spring is fixedly connected to the connecting tube, the spring is in a compressed state, and the spring is used to drive the connecting plate at the end of the connecting tube to slide toward a side away from the cavity, so that the connecting plate presses the end of the coil against the conductive plate.

[0025] 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 tube 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 this way of pressing with the spring, there is no need to weld and fix the end of the coil, thereby eliminating the welding process of multiple coils, which helps to improve 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 avoid the problem that the welded connection may break due to fatigue of the welding point in a vibration environment; in a high temperature environment, the welding point will generate stress due to thermal expansion, which can easily cause the welding point to break, while the spring pressing connection can adapt to thermal expansion through the elasticity of the spring to maintain stable electrical contact; the spring pressing connection is also easy to repair and replace, reducing maintenance time and cost.

[0026] In summary, this application includes the following beneficial technical effects: 1. A limiting rod is arranged on the frame. After the coil is installed, the limiting part of the limiting rod can be used to press against the coil to fix the coil. There is no need to install slot wedges. On the one hand, it simplifies the assembly operation, and on the other hand, it can improve the slot filling rate.

[0027] 2. In the traditional method, the stators of the flat wire windings are connected at the ends by twisting the head and welding. In the present application, the ends of the coils are inserted into the sockets on the PCB board and then welded, which helps to simplify the end structure.

[0028] 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 of the coil after installation; filling with insulating material helps to simplify the assembly operation compared to inserting insulating paper on the coil.

[0029] 4. The setting of the support ring and the abutment component makes it possible to quickly insert the end of the coil 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, and then the end of the coil is pressed against the conductive sheet through the abutment component, and then welding can be performed, which helps to ensure the work efficiency of the assembly process; after assembly, the cavity inside the support ring can also be used for air circulation, thereby accelerating the heat dissipation at the welding point and helping to enhance the heat dissipation effect.

[0030] 5. Under the action of the spring, the connecting piece presses the end of the coil against the conductive piece to complete 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

[0031] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a structural schematic diagram of another viewing angle of Example 1 of the present application; Figure 3 is an explosion diagram of Example 1 of the present application; Figure 4 is a cross-sectional view of Example 1 of the present application for showing the installation position of the limit rod; Figure 5 is a cross-sectional view of Example 1 of the present application for showing the gap; Figure 6 It is a schematic diagram of the overall structure of Example 2 of the present application; Figure 7 This is a schematic diagram of the structure of Example 2 of the present application without the PCB board; Figure 8 yes Figure 7 The enlarged schematic diagram of point A in the middle; Fig. 9 is a cross-sectional view of Example 2 of the present application; Fig.10 yes Fig. 9 The enlarged schematic diagram of point B in the middle; Fig.11 It is a cross-sectional view of Example 3 of the present application.

[0032] 1. Iron core; 11. Stator yoke; 111. Guide groove; 12. Stator tooth; 2. Coil; 3. PCB board; 31. Guide hole; 32. Socket; 4. Skeleton; 41. Mounting ring; 411. Guide block; 4111. Guide column; 42. Limit rod; 421. Support part; 422. Limit part; 423. Perforation; 5. Gap; 6. Support ring; 61. Annular hole; 62. Cavity; 63. Mounting hole; 7. Connecting assembly; 71. Conductive column; 72. Conductive sheet; 73. Abutment 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. Support rod; 16. Sleeve. DETAILED DESCRIPTION

[0033] The following combination Figure 1-Figure 11 This application is described in further detail.

[0034] Example 1 The present application embodiment discloses a stator structure using a flat wire winding. Figure 1 and Figure 2 The stator structure using flat wire winding includes an iron core 1, a coil 2, a PCB board 3 and a frame 4. The iron core 1 includes a stator yoke 11 and stator teeth 12. 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. There are multiple stator teeth 12 and they are arranged in a circular array. Each stator tooth 12 is arranged along the radial direction of the stator yoke 11. There are multiple coils 2, 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, which are used to be electrically connected to the PCB board 3. The coil 2 is provided with a ring hole inside, and the coil 2 is sleeved on the outside of the corresponding stator tooth 12, so that the stator tooth 12 is located in the ring hole inside the coil 2, so as to realize the positioning of the coil 2.

[0035] Reference Figure 2 The PCB board 3 is in a circular ring shape, and the PCB board 3 and the stator yoke 11 are coaxially arranged. The PCB board 3 is provided with multiple groups of jacks 32 for inserting the ends of the coil 2, and each group of jacks 32 includes two jacks, and the two jacks 32 are used to be welded and fixed with the two ends of the same coil 2, and realize the electrical connection between the ends of the coil 2 and the PCB board 3.

[0036] Reference Figure 3The skeleton 4 is made of insulating material. Two skeletons 4 are provided and are respectively located on both sides of the iron core 1. The skeleton 4 includes a mounting ring 41 and a limiting rod 42. The mounting ring 41 is a circular ring coaxially arranged with the stator yoke 11. The limiting rod 42 is radially arranged on the inner wall of the mounting ring 41. There are multiple limiting rods 42 arranged in a circular 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.

[0037] Reference 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 mounting 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, and the plane structure facilitates the support portion 421 to fit with the corresponding stator tooth 12. The limiting portion 422 is fixedly connected to one end of the supporting portion 421 away from the mounting ring 41, and 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 is elastic, and a through hole 423 is provided at the connection between the limiting portion 422 and the supporting portion 421, so that the limiting portion 422 is more easily deformed after being squeezed. The width of the limiting portion 422 in the undeformed state is greater than the width of the annular hole inside the coil 2. Therefore, after the coil 2 is installed on the outer side of the stator tooth 12, the stator tooth 12 and the limiting rod 42 are both located in the annular hole inside the coil 2. At this time, the limiting portion 422 of the limiting rod 42 is deformed by the squeezing of the coil 2, and the deformed limiting portion 422 is pressed against the annular hole inside the coil 2, thereby preliminarily fixing the installed coil 2.

[0038] Among them, a guide block 411 is fixedly connected to the inner wall of the mounting ring 41, and a plurality of guide blocks 411 are provided and arranged in a circular array. The guide block 411 is a rectangular block, and the length direction of the guide block 411 is arranged along the axial direction of the mounting ring 41; the length of the guide block 411 is greater than the thickness of the mounting ring 41, and the guide block 411 is centrally arranged on the mounting ring 41. Correspondingly, a guide groove 111 is opened on the inner wall of the stator yoke 11 along its own axial direction, and the number of the guide grooves 111 is the same as the number of the guide blocks 411, and each guide groove 111 corresponds to a guide block 411. One end of the guide block 411 is slidably connected to the guide groove 111, so that during the assembly process, the cooperation of the guide block 411 and the guide groove 111 can ensure the installation effect, so that when the mounting ring 41 fits with the end face of the stator yoke 11, the plane of the support portion 421 is aligned with the end face of the corresponding stator tooth 12 and is in a fitting state.

[0039] Reference Figure 2 and Figure 5In order to enhance the fixing effect of the coil 2, the width of the support portion 421 is greater than the thickness of the stator tooth 12, so after the coil 2 is installed outside the stator tooth 12, a gap 5 is formed between the stator yoke 11, the stator tooth 12, the support portion 421 at both ends of the stator tooth 12 and the inner ring hole of the coil 2. After all the coils 2 are installed on the corresponding stator teeth 12, the assembled stator structure can be immersed in insulating varnish. At this time, the insulating varnish can be filled in the gap 5 formed by the stator yoke 11, the stator tooth 12, the support portion 421 at both ends of the stator tooth 12 and the inner ring hole of the coil 2. After the insulating varnish is cured, it can play an insulating role on the one hand, separating the coil 2 from the stator tooth 12, and on the other hand, the filled insulating varnish can completely fix the position of the coil 2, thereby ensuring the stability of the coil 2 after installation. After the paint is dipped, 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.

[0040] The width of the inner ring hole of the coil 2 is not less than the width of the support portion 421 , thus facilitating the smooth insertion process of the coil 2 .

[0041] Reference Figure 3 In addition, a guide column 4111 is fixedly connected to the end of the guide block 411 close to the side of the PCB board 3, and a guide hole 31 is opened on the PCB board 3. During the assembly process, the PCB board 3 is slid to the side close to the frame 4, so that the guide column 4111 slides through the guide hole 31, which can guide the installation process of the PCB board 3 and help ensure the installation accuracy of the PCB board 3.

[0042] 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 impact of the insulating layer on the outside of the coil 2 being scratched on the insulation performance during the assembly process, the iron core 1 can be insulated first, such as electrophoresis, spraying, plastic spraying, dipping paint, etc., to further improve the reliability of the stator assembly process.

[0043] The implementation principle of Example 1 is as follows: first, the iron core 1 is insulated; then, two skeletons 4 are placed on both sides of the iron core 1, and the guide block 411 on the skeleton 4 is aligned with the guide groove 111 on the stator yoke 11, and then the guide block 411 is slid into the guide groove 111 until the two skeletons 4 are respectively attached to both sides of the iron core 1, at which time the limit rods 42 on the skeleton 4 and the stator teeth 12 on the iron core 1 are in an attached state, and the two limit rods 42 are respectively attached to the two ends of the stator teeth 12. Then, the coil 2 is inserted into the outer side of the corresponding stator teeth 12 along the radial direction of the iron core 1 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 limit portion 422 will be deformed, and the limit portion 422 will be tightly pressed against the ring hole inside the coil 2 after deformation, so that the initial positioning of the coil 2 is achieved through the limit portion 422.

[0044] Insert each coil 2 in turn, and after all coils 2 are inserted into the outer side of the corresponding stator teeth 12, place the PCB board 3 on the side close to the end of the coil 2; align the guide hole 31 on the PCB board 3 with the guide column 4111 at the end of the guide block 411, so that the guide column 4111 penetrates the guide hole 31, and then slide the PCB board 3 until one side of the PCB board 3 abuts against the guide block 411, at which time the PCB board 3 and the iron core 1 are arranged at intervals; then weld and fix the end of the coil 2 to the jack 32 on the PCB board 3, and the electrical connection between the coil 2 and the PCB board 3 can be completed, and the position of the PCB board 3 can be fixed, thereby completing the installation of the PCB board 3. Then, the assembled stator is dipped in paint, so that the gap 5 formed by the stator yoke 11, the stator teeth 12, the support parts 421 at both ends of the stator teeth 12 and the inner ring hole of the coil 2 is filled with insulating material, which can achieve the insulation effect and completely fix the coil 2 on the iron core 1 and the frame 4, thereby improving the stability of the coil 2 after installation.

[0045] Example 2 Reference Figure 6 and Figure 7 , the difference between this embodiment and embodiment 1 is 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 frame 4. The support ring 6 is a circular ring and is coaxially arranged with the mounting ring 41, and a circular hole 61 is coaxially opened on the support ring 6; there are two circular holes 61, and the diameters of the two circular holes 61 are different; the two circular holes 61 separate the support ring 6 into three independent circular ring parts, and a support rod 15 is fixedly connected between two adjacent circular ring parts, so that the three circular ring parts are fixedly connected as a whole. The circular hole 61 located on the outside is for one end of the coil 2 to be inserted, and the circular hole 61 located on the inside is for the other end of the coil 2 to be inserted. A connecting component 7 is provided on the support ring 6, and the connecting component 7 is used to electrically connect the end of the coil 2 with the PCB board 3.

[0046] Reference Figure 7 and Figure 8 , there are multiple groups of connection components 7, the number of which is twice the number of coils 2, and each coil 2 corresponds to two groups of connection components 7, which correspond to the two ends of the coil 2. The connection component 7 includes a conductive column 71, a conductive sheet 72 and an abutment component 73; one end of the conductive column 71 is welded and electrically connected to the PCB board 3, and the other end of the conductive column 71 is welded to the conductive sheet 72. The conductive sheet 72 is an arc-shaped sheet, one side of which is in contact with 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.

[0047] Reference Fig. 9 and Fig.10 In order to facilitate the abutment component 73 to move, 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 is connected to the inside of the cavity 62, and the other end of the air pipe 8 is located outside the support ring 6. After the end of the air pipe 8 is connected to the air pump, the air pump is turned on, and 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 abutment component 73 to move.

[0048] Reference Fig.10 The abutting component 73 includes a connecting tube 731 and a connecting piece 732. The connecting tube 731 is a round tube, and is arranged along the radial direction of the support ring 6; the connecting tube 731 is slidably connected to the inner wall of the cavity 62 along its own axial direction, one end of the connecting tube 731 is located inside the cavity 62, and the end of the connecting tube 731 located in the cavity 62 is open; the other end of the connecting tube 731 is located outside the cavity 62 and in the annular hole 61, and the end of the connecting tube 731 located in the annular hole 61 is closed and fixedly connected to the connecting piece 732, and the connecting piece 732 is an arc-shaped piece. Therefore, after the air is inflated into the cavity 62 through the air pipe 8, the air pressure in the air increases, and under the action of the air pressure, the connecting tube 731 will slide to the outside of the cavity 62, and the connecting tube 731 drives the connecting piece 732 to slide; since the end of the coil 2 is located between the conductive sheet 72 and the connecting sheet 732, the connecting piece 732 can push the end of the coil 2 to move during the sliding process until the connecting piece 732 presses the end of the coil 2 against the conductive sheet 72. Then, the end of the coil 2 is welded and fixed between the conductive sheet 72 and the connecting sheet 732, so that the end of the coil 2 is electrically connected to the PCB board 3 through the conductive sheet 72 and the conductive column 71, thereby ensuring the smooth conduct of the power-on process.

[0049] Among them, a flexible bag body 10 is fixedly connected between one end of the connecting tube 731 located in the cavity 62 and the inner wall of the cavity 62. The bag body 10 is sleeved on the outer side of the connecting tube 731, and the interior of the bag body 10 is not connected to the interior of the connecting tube 731. Therefore, the provision of the bag body 10 can enhance the sealing performance of the sliding connection between the connecting tube 731 and the inner wall of the cavity 62, thereby ensuring the driving effect of the gas charged into the cavity 62 on the abutment component 73.

[0050] Therefore, during the assembly process, it is only necessary to insert the two ends of the coil 2 into the two annular holes 61 respectively, and then drive the connecting tube 731 and the connecting sheet 732 to move outward by means of inflation, so that the connecting sheet 732 can press the ends of the coil 2 against the conductive sheet 72, and complete the quick connection of the ends of the coil 2, and then weld. That is, the setting of the support ring 6 and the connecting assembly 7 can speed up 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 of the coil 2 itself is deformed, there is a large fault tolerance space, and the connection process of the ends of the coil 2 can be completed quickly, thereby improving the working efficiency of the assembly process.

[0051] Reference Fig.10 The support ring 6 is provided with a mounting hole 63, and a plurality of mounting holes 63 are provided and arranged in a circular array. The support ring 6 and the PCB board 3 are fixedly connected by a connecting rod 14 (refer to Figure 6 During assembly, align the mounting hole 63 on the support ring 6 with the guide column 4111 on the guide block 411, and then slide the support ring 6 so that the guide column 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.

[0052] The support ring 6 is also fixedly connected to the inside of the sleeve 16, which is located at the mounting hole 63. The two ends of the sleeve 16 are respectively fixedly connected to the inner walls of the two sides of the cavity 62, and the inside of the sleeve 16 is not connected to the inside of the cavity 62. The guide column 4111 is slidably arranged in the sleeve 16, so that the sealing of the internal structure of the cavity 62 will not be affected during the process of inserting the guide column 4111 into the sleeve 16, which helps to ensure the normal operation of the abutment component 73.

[0053] In addition, the air pump in this embodiment is a bidirectional air pump, so before the end of the coil 2 is pressed and fixed, the gas in the cavity 62 can be extracted through the air pipe 8, and under the action of negative pressure, the connecting tube 731 can slide to the inside of the cavity 62, so that the connecting piece 732 fits the outer wall on both sides of the cavity 62; at this time, the connecting piece 732 in the two annular holes 61 and the corresponding conductive sheet 72 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, so that the connecting tube 731 and the connecting piece 732 are driven to slide to the outside of the cavity 62 by the action of the air pressure, so that the connecting piece 732 presses the end of the coil 2 against the conductive sheet 72, which is convenient for the subsequent welding process to proceed smoothly.

[0054] It should be noted that after the welding process is completed, the positions of the support ring 6 and the PCB board 3 are fixed because the end of the coil 2 is fixedly connected to the conductive sheet 72. Since the PCB board 3 and the support ring 6 are spaced apart, the welding of the end of the coil 2 at the annular hole 61 on the support ring 6 can be achieved, which helps to ensure the ventilation effect of the end of the coil 2 when the stator is working, thereby enhancing the heat dissipation effect.

[0055] Reference Fig. 9 and Fig.10 Furthermore, a branch pipe 9 is fixedly connected to the support ring 6, one end of the branch pipe 9 is connected to the inside of the cavity 62, and the other end of the branch pipe 9 is located outside the support ring 6, and the end of the branch pipe 9 located outside the support ring 6 is threadedly connected with a screw cap 91. During the assembly process, the screw cap 91 closes the end of the branch pipe 9, so that 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, so that the connecting pipe 731 and the connecting piece 732 slide to the outside of the cavity 62, so as to achieve the tight fixation 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 connected to the outside through the air pipe 8 and the branch pipe 9, so when the outside of the stator assembly is air-cooled, the flowing wind can enter the cavity 62 and then be discharged, thereby taking away the heat generated during the power-on process of some welding parts, which can enhance the heat dissipation effect.

[0056] The implementation principle of Example 2 is as follows: first, the iron core 1 is insulated; then, the frame 4 is installed on both sides of the iron core 1, and the coil 2 is inserted into the corresponding stator teeth 12 in sequence, and the coil 2 is initially fixed by the deformed limiter 422. The end of the air pipe 8 is connected to the air pump, and the air pump is turned on. 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 located on the side away from the conductive piece 72. Then, the support ring 6 is installed on one side of the frame 4, and the PCB board 3 is located on the side of the support ring 6 away from the frame 4, and the two ends of the coil 2 are respectively inserted into the two annular holes 61.

[0057] Then the air pump injects gas into the cavity 62 through the air pipe 8, so that the air pressure in the cavity 62 increases. Therefore, under the action of the air pressure, the connecting tube 731 can slide to the outside of the cavity 62, and the connecting tube 731 drives the connecting piece 732 at the end to slide until the connecting piece 732 presses the end of the coil 2 against the conductive sheet 72. When all the ends of the coil 2 are pressed tightly, the ends of the coil 2 can be welded. After the welding is completed, disconnect the connection between the air pump and the air pipe 8, and open the rotary cover 91. At this time, the cavity 62 is connected to the outside through the air pipe 8 and the branch pipe 9. In the subsequent power-on process, the inside of the cavity 62 can be used for air circulation, thereby accelerating heat dissipation.

[0058] Example 3 Reference Fig.11 The difference between this embodiment and embodiment 2 is that a spring 13 is provided inside the cavity 62 in this embodiment, and the number of the springs 13 is the same as the number of the connecting tubes 731. The spring 13 is fixedly connected between the closed end of the connecting tube 731 and the inner wall of the cavity 62, and the spring 13 is in a compressed state, so that the spring 13 makes the connecting tube 731 have a tendency to slide toward the outer side of the air side.

[0059] During the assembly process, in the initial state, the spring 13 makes the connecting piece 732 press against the corresponding conductive piece 72; then the air pipe 8 is connected to the vacuum pump, the vacuum pump is turned on, and the vacuum pump extracts the gas in the cavity 62 through the air pipe 8. Therefore, in the process of vacuumizing the cavity 62, the connecting pipe 731 will overcome the elastic force of the spring 13 and slide toward the inside of the cavity 62, so that the connecting pipe 731 drives the connecting piece 732 to slide, and the connecting piece 732 is separated from the contact with the conductive piece 72. Next, the support ring 6 is installed on one side of the skeleton 4 so that the end of the coil 2 is inserted into the corresponding annular hole 61; then the vacuuming is stopped, the connection between the vacuum pump and the air pipe 8 is disconnected, and under the action of the restoring force of the spring 13, the connecting pipe 731 slides toward the outside of the cavity 62, and the connecting pipe 731 drives the connecting piece 732 to slide, so that the connecting piece 732 presses the end of the coil 2 against the corresponding conductive piece 72, thereby realizing the electrical connection of the end of the coil 2.

[0060] The spring 13 allows the connecting piece 732 to press the end of the coil 2 tightly, so 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 assembly efficiency.

[0061] In addition, it should be noted that after the spring 13 causes the connecting piece 732 to press the end of the coil 2 tightly, the positions of the support ring 6 and the PCB board 3 are fixed due to the fixed connection between the end of the coil 2 and the conductive piece 72.

[0062] Furthermore, in this embodiment, the support ring 6 includes a cover plate at an edge and a cylindrical shell, and the cover plate and the shell are detachably connected, thereby facilitating processing of the internal structure of the support ring 6. When damaged, it is also convenient to disassemble the cover plate and then replace the internal structure.

[0063] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stator structure using flat wire windings, characterized in that: include: An iron core (1) comprising 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 of the coils (2) corresponding to a stator tooth (12), and the coils (2) being sleeved on the corresponding stator teeth (12); A PCB board (3) is arranged on one side of the iron core (1) and is used to be connected to an end of the coil (2); The skeleton (4) is provided with two and is respectively located on both sides of the iron core (1). The skeleton (4) comprises a mounting ring (41) and a limiting rod (42). The mounting ring (41) is coaxially arranged with the stator yoke (11). The number of the limiting rods (42) is the same as the number of the stator teeth (12). Each limiting rod (42) corresponds to a stator tooth (12). The limiting rods (42) are radially arranged on the inner wall of the mounting ring (41). The side of the limiting rods (42) close to the stator yoke (11) is used to abut against the stator teeth (12). The stator (42) comprises a supporting portion (421) and a limiting portion (422), wherein the supporting portion (421) is fixedly connected to the inner wall of the mounting ring (41), and the limiting portion (422) is fixedly connected to an end of the supporting portion (421) away from the mounting ring (41), and the limiting portion (422) is elastic, and the width of the limiting portion (422) before deformation is greater than the width of the internal ring hole of the coil (2), so that after the coil (2) is sleeved on the outside of the stator tooth (12) and the limiting rod (42), the limiting portion (422) is squeezed and deformed and pressed against the internal ring hole of the coil (2).

2. A stator structure using flat wire windings according to claim 1, characterized in that: A through hole (423) is provided at the connection between the limiting portion (422) and the supporting portion (421).

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

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

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

6. The stator structure using flat wire winding according to claim 1, characterized in that: A support ring (6) is arranged 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) and the mounting ring (41) are coaxially arranged; an annular hole (61) is coaxially opened on the support ring (6) for inserting the end of the coil (2); a connecting component (7) is arranged on the support ring (6); the number of the connecting components (7) matches the number of the coils (2); each of the connecting components (7) is connected to a coil (2); The connecting assembly (7) corresponds to the PCB (3) and the coil (2), the connecting assembly (7) comprising a conductive column (71), a conductive sheet (72) and an abutment component (73), the conductive column (71) being fixedly connected between the PCB board (3) and the conductive sheet (72), the conductive sheet (72) being attached to the inner wall of the annular hole (61), the abutment component (73) being arranged between the conductive sheet (72) and the end of the coil (2), the abutment component (73) being used for pressing the end of the coil (2) against the conductive sheet (72).

7. The stator structure using flat wire winding according to claim 6, characterized in that: An annular cavity (62) is provided 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 in communication with the cavity (62); the other end of the air pipe (8) is used to be connected to an air source; the abutment component (73) comprises a connecting pipe (731) and a connecting sheet (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 arranged to be open; the connecting pipe (731) is connected to the inner wall of the cavity (62) by a connecting sheet (732); The other end of the connecting tube (731) is located in the annular hole (61) and is arranged in a closed manner. One end of the connecting tube (731) located in the annular hole (61) is fixedly connected to the connecting sheet (732), so that when air is inflated into the cavity (62) through the air pipe (8), the connecting tube (731) slides toward the side away from the cavity (62) and drives the connecting sheet (732) to slide until the connecting sheet (732) presses 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 sheet (732).

8. The stator structure using 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 in communication with the cavity (62), and the other end of the branch pipe (9) is threadedly connected to a screw cap (91).

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

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

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