Single-phase four-pole series motor

Abstract

The present invention discloses a single-phase four-pole series-excited motor, comprising a stator assembly, a rotor, a rotating shaft, an upper bracket assembly, a lower bracket and a fan blade assembly. The upper bracket assembly comprises an upper bracket and a carbon brush assembly. The stator assembly is mounted on the outside of the rotor, the rotating shaft is sleeved on the rotor, the upper bracket and the lower bracket are respectively fixed at both ends of the stator assembly, the fan blade assembly is sleeved on one end of the rotating shaft, the carbon brush assembly is located on the outer periphery of the rotor, one side of the upper bracket is provided with a mounting position, and there are four mounting positions. The carbon brush assembly is arranged in the mounting position and corresponds to the mounting position one by one. By mounting the carbon brush assembly on the mounting position of the upper bracket, the carbon brush assembly can be pre-assembled with the upper bracket during assembly to form an upper bracket assembly, which is convenient for overall installation. The various parts of the single-phase four-pole series-excited motor are assembled in the form of assemblies. Each component is assembled separately first, and then the whole machine is assembled. The installation is convenient and the installation process is simplified, the difficulty of matching is reduced, the assembly time is saved, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to an important component of a motor, and in particular relates to a single-phase four-pole series-excited motor. Background Art

[0002] When assembling existing motors, the rotor and shaft are first mated, then inserted and mated with the aluminum bracket on one side. The carbon brushes are then assembled into the brush box, and the aluminum bracket assembly and rotor assembly are assembled onto the stator assembly. Finally, the aluminum bracket on the other side is assembled. The entire assembly process is cumbersome and requires high assembly requirements, significantly affecting assembly efficiency. Furthermore, to prevent the carbon brushes from falling out of the brush box, a spring is installed on the outside of the brush box after installation to hold the brushes in place, making installation more complex. Summary of the Invention

[0003] An object of the present invention is to provide a single-phase four-pole series-excited motor that can solve at least one of the above-mentioned problems.

[0004] According to one aspect of the present invention, a single-phase four-pole series-excited motor is provided, comprising a stator assembly, a rotor, a rotating shaft, an upper bracket assembly, a lower bracket and a fan blade assembly, the upper bracket assembly comprising an upper bracket and a carbon brush assembly, the stator assembly being mounted on the outside of the rotor, the rotating shaft being sleeved on the rotor, the upper bracket and the lower bracket being fixed at both ends of the stator assembly, respectively, the fan blade assembly being sleeved on one end of the rotating shaft, the carbon brush assembly being located on the outer periphery of the rotor, a mounting position being provided on one side of the upper bracket, and four mounting positions being provided, the carbon brush assemblies being arranged in the mounting positions and corresponding one to one to the mounting positions.

[0005] The present invention has the following advantages: by installing the carbon brush assembly in the mounting position of the upper bracket, the carbon brush assembly and the upper bracket can be pre-assembled during assembly to form the upper bracket assembly, facilitating overall installation. The components of the single-phase four-pole series-excited motor are assembled in the form of assemblies, allowing each component to be assembled separately before the entire motor is assembled. This facilitates installation, simplifies the installation process, reduces coordination difficulty, saves assembly time, and improves assembly efficiency.

[0006] In some embodiments, the upper bracket is a plastic bracket with a mounting position provided with a slot. The carbon brush assembly includes a carbon brush box, which is located within the mounting position. The carbon brush box is provided with a mounting block that engages with the slot. Thus, by providing a mounting position on the upper bracket, the carbon brush assembly can be directly secured to the slot via the mounting block. When engaged, the mounting block on the carbon brush box is inserted into the slot and secured, thereby securing the upper bracket and the carbon brush assembly together and forming the entire upper bracket assembly. This greatly simplifies the installation process of the upper bracket assembly, facilitates automated assembly, and improves assembly efficiency.

[0007] In some embodiments, the upper bracket assembly further includes a rolling bearing, which is sleeved on the outside of the rotating shaft. A mounting hole is defined in the center of the upper bracket, within which the rolling bearing is sleeved, and the carbon brush assembly is positioned around the outer periphery of the rolling bearing. The provision of the mounting hole facilitates the pre-installation of the rolling bearing on the upper bracket, facilitating the securement of the entire upper bracket assembly to the rotor, rotating shaft, and other components, simplifying the installation process.

[0008] In some embodiments, the carbon brush assembly further comprises a carbon brush, a pressure block, a braid, and a spring. The carbon brush box is provided with a U-shaped mounting groove, and the carbon brush, pressure block, braid, and spring are all disposed within the U-shaped mounting groove. The carbon brush and pressure block are respectively connected to the ends of the braid. The spring surrounds the braid, with the ends respectively contacting the carbon brush and pressure block, and the carbon brush contacts the rotor. Thus, the braid facilitates the connection and fixation of the pressure block to the carbon brush, facilitating the fixation of the pressure block within the carbon brush box and preventing the carbon brush from detaching from the brush box. The spring, through its rebound force, can push the carbon brush, causing it to adhere tightly to the rotor, thereby ensuring the performance of the entire motor.

[0009] In some embodiments, the stator assembly includes a stator core, an upper bobbin, and a lower bobbin. The stator core includes a body and a tooth portion. The teeth are four and evenly distributed on the inner side of the body. The upper and lower bobbin structures are identical and are located on the upper and lower sides of the tooth portion, respectively. There are four upper and lower bobbin structures, each corresponding to the other. Thus, by providing the upper and lower bobbin structures, the stator core, the upper and lower bobbin structures can be individually formed and processed, facilitating production and processing, reducing the length of the stator core, and reducing costs. Furthermore, by providing the upper and lower bobbin structures, the winding of the enameled wire can be facilitated.

[0010] In some embodiments, the upper bobbin includes a frame, a left connecting portion, and a right connecting portion. The frame of the upper bobbin matches the upper end face of the main body, and the frame of the lower bobbin matches the lower end face of the main body. The left connecting portion and the right connecting portion are provided on one side of the frame and are located on both sides of the tooth portion, matching the side faces of the tooth portion. The left connecting portion of the upper bobbin matches the right connecting portion of the lower bobbin, and the right connecting portion of the upper bobbin matches the left connecting portion of the lower bobbin. Square pillars are provided at both ends of the frame, and the square pillars are provided with V-shaped notches. Thus, by providing the connecting portions, the upper bobbin and the lower bobbin can be easily fixed to the stator chips, making assembly easier. By providing the square pillars, the ends of the wound enameled wire can be easily passed through the V-shaped notches on the square pillars, and then the enameled wire can be pressed and connected through the assembled piercing terminals, facilitating communication with the external circuit. This improves the overall simplicity of the motor and reduces the size of the entire motor.

[0011] In some embodiments, an inner stop is provided on the inner side of the left connecting portion, and an outer stop is provided on the outer side of the right connecting portion. The inner stop of the upper bobbin can correspond to the outer stop of the lower bobbin, and the outer stop of the upper bobbin can correspond to the inner stop of the lower bobbin. Thus, by providing outer and inner stops on the outer and inner sides of the connecting portion, respectively, different stop structures can be overlapped, facilitating the coordination of the upper and lower bobbin.

[0012] In some embodiments, the upper wire rack further includes a baffle plate, which is arranged on the other side of the rack body, thereby facilitating the molding of the entire upper wire rack and the lower wire rack.

[0013] In some embodiments, a fan blade assembly includes a fan blade and a magnetic ring. The fan blade includes multiple blades. A mounting post is provided in the middle of the fan blade. The blades are evenly distributed around the outer periphery of the mounting post. The mounting post is provided with an axial hole. One end of a rotating shaft is inserted into the axial hole. The magnetic ring is sleeved on the outer side of the mounting post. The mounting post and the fan blade form an integrally formed structure. Thus, by providing a mounting post in the middle of the fan blade, the magnetic ring can be directly sleeved on the mounting post, that is, the magnetic ring is directly mounted on the fan blade, achieving zero distance between the magnetic ring and the fan blade, significantly shortening the axial length of the entire fan blade assembly, reducing the overall space occupied, and reducing the number of assembly steps, saving assembly man-hours, and improving assembly efficiency.

[0014] In some embodiments, the stator assembly of a single-phase four-pole series-excited motor further includes a Hall element. A mounting notch, a fixing hole, and a stopper are provided on the other side of the upper bracket. One end of the Hall element engages with the mounting notch, while the other end is secured to the fixing hole. The other end of the Hall element is sleeved onto the stopper. Thus, by providing the mounting notch, fixing hole, and stopper on the upper bracket, the Hall element can be easily installed and fixed, facilitating automated operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the single-phase four-pole series-excited motor of the present invention;

[0016] Figure 2 It is a schematic structural diagram of the cooperation between the rotor and the rotating shaft in the single-phase four-pole series-excited motor of the present invention;

[0017] Figure 3 1 is a schematic structural diagram of a stator assembly in a single-phase four-pole series-excited motor of the present invention;

[0018] Figure 4 Schematic diagram of the structure of the stator chip in the single-phase four-pole series-excited motor of the present invention;

[0019] Figure 5 This is a structural schematic diagram of an upper bobbin in a single-phase four-pole series-excited motor according to the present invention from one perspective;

[0020] Figure 6This is a structural schematic diagram of the upper bobbin in the single-phase four-pole series-excited motor of the present invention from another perspective;

[0021] Figure 7 It is a structural schematic diagram of the upper bracket assembly in the single-phase four-pole series-excited motor of the present invention;

[0022] Figure 8 This is a structural schematic diagram of the upper bracket assembly in the single-phase four-pole series motor of the present invention from another perspective;

[0023] Figure 9 It is a structural schematic diagram of the upper bracket in the single-phase four-pole series-excited motor of the present invention;

[0024] Figure 10 It is a structural schematic diagram of a carbon brush assembly in a single-phase four-pole series-excited motor of the present invention;

[0025] Figure 11 It is a structural schematic diagram of a carbon brush assembly portion of a single-phase four-pole series-excited motor of the present invention;

[0026] Figure 12 It is a schematic structural diagram of the fan blade assembly in the single-phase four-pole series-excited motor of the present invention;

[0027] Figure 13 It is a structural schematic diagram of the magnetic ring in the single-phase four-pole series-excited motor of the present invention;

[0028] Figure 14 It is a structural schematic diagram of the fan blades in the single-phase four-pole series-excited motor of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Reference Figures 1 to 14 The single-phase four-pole series-excited motor includes a stator assembly 1, a rotor 2, a rotating shaft 3, an upper bracket assembly 4, a lower bracket 5, and a fan blade assembly 6. The upper bracket assembly 4 includes an upper bracket 41 and a carbon brush assembly 42. The stator assembly 1 is mounted on the outside of the rotor 2. The rotating shaft 3 is sleeved on the rotor 2. The upper bracket 41 and the lower bracket 5 are respectively fixed at both ends of the stator assembly 1. The fan blade assembly 6 is sleeved on one end of the rotating shaft 3. The carbon brush assembly 42 is located on the outer periphery of the rotor 2. One side of the upper bracket 41 is provided with a mounting position 411. There are four mounting positions 411. The carbon brush assemblies 42 are arranged in the mounting positions and correspond one-to-one with the mounting positions 411. That is, there are also four groups of carbon brush assemblies 42.

[0031] During assembly of the single-phase four-pole series-excited motor of the present invention, the rotor 2 is mated with the rotating shaft 3 to form the rotor assembly. The stator assembly 1 is then assembled with the upper bracket assembly 4, followed by the rotor assembly. The lower bracket 5 is then assembled, followed by the carbon brush assembly 42. Finally, the fan assembly 6 is mounted on the rotating shaft 3 to complete the assembly. This reduces the number of assembly steps, saves time, and improves assembly efficiency.

[0032] like Figures 8 to 11 The upper bracket 41 is a plastic bracket with a slot 412 formed in the mounting position 411. The carbon brush assembly 42 includes a carbon brush box 421, which is located within the mounting position 411 and has a mounting block 422 that mates with the slot 412. The upper bracket 41 is made of plastic, facilitating its integral injection molding. The mounting position 411 is U-shaped, with the slot 412 located inside the mounting position 411, facilitating installation of the carbon brush assembly 42.

[0033] By providing a mounting position 411 on the upper bracket 41, when mating, the mounting block 422 on the carbon brush box 421 is inserted into the slot 412 and fixed, thereby achieving the installation and fixation of the upper bracket 41 and the carbon brush assembly 42. This can greatly simplify the installation process of the entire upper bracket assembly 4, facilitate automated assembly, facilitate installation, and improve assembly efficiency.

[0034] Upper bracket assembly 4 also includes a rolling bearing 43, which is sleeved on the outside of rotating shaft 3. A mounting hole 413 is provided in the middle of upper bracket 41, and rolling bearing 43 is sleeved within mounting hole 413. Carbon brush assembly 42 is located on the outer periphery of rolling bearing 43, and rotating shaft 3 is sleeved on rolling bearing 43. The provision of rolling bearing 43 prevents direct contact between rotating shaft 3 and upper bracket 41. Shaft hole 613 facilitates the installation and fixation of rolling bearing 43 to the mounting hole of upper bracket 41, facilitating direct mating with the rotor assembly and facilitating assembly.

[0035] The upper bracket 41 includes four mounting claws 416, which are evenly distributed. There are four mounting positions 11, which are respectively located on the four mounting claws 416. The outer sides of the mounting claws 416 are fixed to the stator assembly 1 by screws, which can facilitate the fixing of the upper bracket 41.

[0036] The two sides of the mounting block 422 are serrated, and the two sides of the mounting block 422 match the side walls of the slot 412. The mounting block 422 and the slot 412 adopt an interference fit, so that the two sides of the mounting block 422 are clamped tightly with the slot 412, ensuring the stability of the cooperation between the two.

[0037] The carbon brush assembly 42 also includes a carbon brush 423, a pressure block 424, a braid 425, and a spring 426. The carbon brush box 421 is provided with a U-shaped mounting slot 4211. The carbon brush 423, pressure block 424, braid 425, and spring 426 are all mounted within the U-shaped mounting slot 4211. The carbon brush 423 and pressure block 424 are connected to the ends of the braid 425, respectively. The spring 426 is wrapped around the braid 425, with its ends abutting the carbon brush 423 and pressure block 424, respectively. The carbon brush 423 abuts the rotor 2. The braid 425 is a copper braid formed by entangled multiple thin copper wires. One end is embedded in the carbon brush 423 and securely fixed. After the spring 426 is placed over the braid 425, the other end of the braid 425 is welded and secured to the pressure block 424.

[0038] Limiting holes 4212 are provided on both sides of the U-shaped mounting groove 4211, and protrusions 4241 are provided on the pressing block 424. The protrusions 4241 snap into and engage with the limiting holes 4212. Therefore, during the assembly of the carbon brush assembly 42 and the carbon brush box 421, the carbon brush 423, the pressing block 424, the braid 425, and the spring 426 are first assembled, and then inserted into the U-shaped mounting groove 4211. The protrusions 4241 snap into the limiting holes 4212 to achieve secure installation, which is convenient and easy to operate.

[0039] In actual use, in order to improve the stability of the installation of the carbon brush box 421, there are two mounting blocks 422 on each side of the U-shaped mounting groove 4211, and two corresponding card slots 412 on each side of the mounting position 11, which facilitate the insertion and fixation of the mounting blocks 422 and the card slots 412.

[0040] The other end of the carbon brush 423 extends beyond the corresponding end of the brush box 421. The spring 426 is compressed by the pressure block 424 and the carbon brush 423. Therefore, the rebound force of the spring 426 forces the carbon brush 423 to press against the rotor, meeting the motor's operating requirements.

[0041] The end surface of the other end of the pressing block 424 is located on the inner side of the corresponding end surface of the carbon brush box 421 (wherein the inner side is the side where the spring 426 is located). Therefore, the pressing block does not affect the installation and coordination of other structures.

[0042] The mounting block 422 and the carbon brush box 421 are integrally formed, which facilitates the molding of the mounting block 422 and the carbon brush box 421. By providing the mounting block 422, the carbon brush box 421 can be easily inserted into the card slot 412, thereby achieving rapid installation of the carbon brush box 421.

[0043] The protrusion 4241 and the pressing block 424 are an integrally formed structure, thereby facilitating the molding and processing of the protrusion.

[0044] Figures 3 to 6The stator assembly 1 includes a stator core 11, an upper wire rack 12 and a lower wire rack 13. The stator core 11 includes a body 111 and a tooth portion 112. There are four tooth portions 112, which are evenly distributed on the inner side of the body 111. The upper wire rack 12 and the lower wire rack 13 have the same structure. The upper wire rack 12 and the lower wire rack 13 are respectively arranged on the upper and lower sides of the tooth portion 112. There are four upper wire racks 12 and four lower wire racks 13, and they correspond one to one. That is, one tooth portion 112 corresponds to one upper wire rack 12 and one lower wire rack 13. There are four upper wire racks 12 and four lower wire racks 13. By providing the upper wire rack 12 and the lower wire rack 13, the structure of the stator core 11 can be simplified, the stator core 11 can be easily molded, and the production cost can be reduced. After the upper wire rack 12 and the lower wire rack 13 are assembled on the stator core 11, the enameled wire can be wound on the outer sides of the upper wire rack and the lower wire rack outside the tooth portion 112.

[0045] The upper wire rack 12 includes a frame body 121, a left connecting part 122 and a right connecting part 126. The frame body 121 of the upper wire rack 12 cooperates with the upper end surface of the main body 111, and the frame body 121 of the lower wire rack 13 cooperates with the lower end surface of the main body 111. The left connecting part 122 and the right connecting part 126 are arranged on one side of the frame body 121 and are located on both sides of the tooth portion 112, and cooperate with the side surfaces of the tooth portion 112. The left connecting part 122 of the upper wire rack 12 cooperates with the right connecting part 126 of the lower wire rack 13, and the right connecting part 126 of the upper wire rack 12 cooperates with the left connecting part 122 of the lower wire rack 13. Square columns 123 are provided at both ends of the frame body 121, and V-shaped notches are provided on the square columns 123. Among them, the left connecting part 122 and the right connecting part 126 are located on both sides of the tooth part 112, that is, two connecting parts are connected on one frame 121, so that the left connecting part 122 and the right connecting part 126 are clamped on both sides of the tooth part 112, which facilitates the cooperation and fixation of the upper wire rack 12 and the lower wire rack 13 with the stator chip 1, and facilitates the winding of the enameled wire.

[0046] Furthermore, the square post 123 facilitates the winding of the enameled wire through the V-shaped notch on the square post 123. The enameled wire is then crimped and connected to the external circuit through the assembled piercing terminal, thereby improving the overall simplicity of the motor and reducing its size.

[0047] An inner stop 127 is provided on the inner side of the left connecting portion 122, and an outer stop 124 is provided on the outer side of the right connecting portion 126. The inner stop 127 of the upper bobbin 12 can correspond to the outer stop 124 of the lower bobbin 13, and the outer stop 124 of the upper bobbin 12 can correspond to the inner stop 127 of the lower bobbin 13. Specifically, when the upper bobbin 12 and the lower bobbin 13 are fixed to the stator core 1, the frame 121 mates with the end surface of the stator core 1, and the connection between the upper bobbin 12 and the lower bobbin 13 is tightly attached to the sides of the tooth portion 112. At the same time, on one side of the tooth portion 112, the inner stop 127 of the left connecting part 122 of the upper wire rack 12 abuts against the outer stop 126 of the right connecting part 126 of the lower wire rack 13; on the other side of the tooth portion 112, the outer stop 127 of the right connecting part 126 of the upper wire rack 12 abuts against the inner stop 122 of the left connecting part of the lower wire rack 13.

[0048] The upper wire rack 12 further includes a baffle 125, which is provided on the other side of the frame body 121. By providing the baffle 125, the winding of the enameled wire can be limited, which facilitates the winding of the enameled wire on the stator assembly.

[0049] The frame body 121, the connecting portion 122 and the baffle 125 are an integrally formed structure, thereby facilitating the molding of the upper wire rack 12 and the lower wire rack 13.

[0050] The outer periphery of the stator chip 11 is provided with a positioning groove 113; the positioning groove 113 is located between two adjacent upper wire racks 12. Thus, through the positioning groove 113, the stator chip 11 can be conveniently fixed with other structures in the motor, and the installation structure of the stator chip 11 can be simplified, which is conducive to reducing the overall volume of the motor. There can be multiple positioning grooves 113 to meet the installation requirements of the stator chip 11 and the corresponding structure. Among them, the positioning groove 113 includes a screw groove and a bracket positioning groove. The bracket positioning groove is located on both sides of the screw groove. The upper bracket and the lower bracket are correspondingly formed with positioning protrusions, and the positioning protrusions are snapped into the two ends of the bracket positioning groove, thereby facilitating the positioning and installation of the stator chip 11 and the upper and lower brackets. After the upper bracket, the stator chip 11 and the lower bracket are positioned, the screws pass through the upper bracket, the screw groove and the lower bracket, and the three are locked and fixed.

[0051] Figures 12 to 14The fan blade assembly 6 includes a fan blade 61 and a magnetic ring 62. The fan blade 61 includes multiple blades 611. A mounting post 612 is provided in the middle of the fan blade 61. The blades 611 are evenly distributed on the outer periphery of the mounting post 612. The mounting post 612 is provided with an axial hole 613. One end of the rotating shaft 3 is inserted into the axial hole 613. The magnetic ring 62 is sleeved on the outer side of the mounting post 612. The mounting post 612 and the fan blade 61 are an integrally formed structure. In actual use, the fan blade 61 also includes a panel 616. The blades 11 are provided on the panel 616. Adjacent blades 11 and the panel 616 form an air duct to facilitate the timely dissipation of heat. Among them, the blades 611 and the panel 616 are an integrally formed structure; the axial hole 613 is fitted with the rotating shaft sleeve.

[0052] By providing a mounting post 612 in the middle of the fan blade 61, the magnetic ring 62 can be directly mounted on the mounting post 612, that is, the magnetic ring 62 is directly mounted on the fan blade 61, achieving zero distance between the magnetic ring 62 and the fan blade 61. This significantly shortens the axial length of the entire fan blade assembly, reduces the overall space occupied, and reduces the number of assembly steps, saving assembly time and improving assembly efficiency. At the same time, the provision of the mounting hole 613 facilitates the installation of the motor shaft.

[0053] During actual use, in order to ensure the heat dissipation efficiency of the fan blade 61 , the outer edge of the blade 611 is flush with the outer edge of the panel 616 .

[0054] A retaining strip 614 is provided on the outside of the mounting post 612, and a retaining groove 621 is provided on the inner wall of the magnetic ring 62. The retaining groove 621 engages with the retaining strip 614. Inserting the retaining strip 614 into the retaining groove 621 ensures a secure fit between the magnetic ring 62 and the mounting post 612. The presence of two retaining strips 614 and two retaining grooves 621 enhances the stability of the fit.

[0055] A limiting platform 615 is provided on the top of the mounting post 612. The outer diameter of the limiting platform 615 is larger than the outer diameter of the mounting post 612. The limiting platform 615 and the mounting post 612 are an integral injection-molded structure.

[0056] When the fan blade assembly of the motor is assembled, the magnetic ring 62 is placed in the injection mold of the fan blade 61, and then the fan blade 61 is injection molded, thereby ensuring the stability of the cooperation between the magnetic ring 62 and the fan blade 61.

[0057] The bottom edge of the blade 611 is a straight edge, and the blade 611 is a straight blade, so that the fan blade assembly can be suitable for various types of motors, thereby improving the overall scope of application.

[0058] The number of blades 611 is an odd number, which is beneficial to reducing the noise generated when the blades rotate.

[0059] The number of blades 611 is nineteen, which meets the heat dissipation requirements of the fan blades.

[0060] The stator assembly of the single-phase four-pole series-excited motor of the present invention also includes a Hall element 7. The other side of the upper bracket 41 is provided with a mounting notch 414, a fixing hole 415, and a retaining post 417. One end of the Hall element 7 engages with the mounting notch 414, and the other end is secured to the fixing hole 415. The shape of the mounting notch 414 is identical to that of one end of the Hall element 7, making it easy to snap one end of the Hall element 7 into the mounting notch 414, thereby achieving the installation and positioning of the Hall element 7. The other end of the Hall element 7 is positioned on the retaining post 417 and then locked and secured to the fixing hole 415 via screws. This allows for quick positioning and installation of the Hall element 7.

[0061] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. Single-phase four-pole series motor, characterized in that: The invention comprises a stator assembly (1), a rotor (2), a rotating shaft (3), an upper bracket assembly (4), a lower bracket (5) and a fan blade assembly (6), wherein the upper bracket assembly (4) comprises an upper bracket (41) and a carbon brush assembly (42), the stator assembly (1) is mounted on the outside of the rotor (2), the rotating shaft (3) is sleeved on the rotor (2), the upper bracket (41) and the lower bracket (5) are respectively fixed to two ends of the stator assembly (1), the fan blade assembly (6) is sleeved on one end of the rotating shaft (3), the carbon brush assembly (42) is located on the outer periphery of the rotor (2), one side of the upper bracket (41) is provided with a mounting position (411), the mounting positions (411) are four, and the carbon brush assembly (42) is arranged in the mounting position and corresponds to the mounting position (411) one by one; The upper bracket (41) is a plastic bracket, the mounting position (411) is provided with a slot (412), the carbon brush assembly (42) includes a carbon brush box (421), the carbon brush box (421) is located in the mounting position (411), and the carbon brush box (421) is provided with a mounting block (422), and the mounting block (422) cooperates with the slot (412); The upper bracket assembly (4) further includes a rolling bearing (43), the rolling bearing (43) being sleeved on the outside of the rotating shaft (3), a mounting hole (413) being provided in the middle of the upper bracket (41), the rolling bearing (43) being sleeved in the mounting hole (413), and the carbon brush assembly (42) being located on the outer periphery of the rolling bearing (43); The carbon brush assembly (42) further includes a carbon brush (423), a pressure block (424), a braid (425), and a spring (426); the carbon brush box (421) is provided with a U-shaped mounting groove (4211); the carbon brush (423), the pressure block (424), the braid (425), and the spring (426) are all arranged in the U-shaped mounting groove (4211); the carbon brush (423) and the pressure block (424) are respectively connected to the two ends of the braid (425); the spring (426) surrounds the braid (425), and the two ends are respectively in contact with the carbon brush (423) and the pressure block (424); the carbon brush (423) is in contact with the rotor (2); The fan blade assembly (6) comprises a fan blade (61) and a magnetic ring (62), the fan blade (61) comprises a plurality of blades (611), a mounting post (612) is provided in the middle of the fan blade (61), the blades (611) are evenly distributed on the periphery of the mounting post (612), an axial hole (613) is provided on the mounting post (612), one end of the rotating shaft (3) is inserted into the axial hole (613), the magnetic ring (62) is sleeved on the outside of the mounting post (612), and the mounting post (612) and the fan blade (61) are an integrally formed structure; The stator assembly (1) comprises a stator chip (11), an upper wire rack (12) and a lower wire rack (13); the stator chip (11) comprises a body (111) and a tooth portion (112); the tooth portion (112) is four and is evenly distributed on the inner side of the body (111); the upper wire rack (12) and the lower wire rack (13) have the same structure; the upper wire rack (12) and the lower wire rack (13) are respectively arranged on the upper and lower sides of the tooth portion (112); the upper wire rack (12) and the lower wire rack (13) are four and correspond to each other; The upper wire rack (12) includes a frame body (121), a left connecting portion (122) and a right connecting portion (126). The frame body (121) of the upper wire rack (12) cooperates with the upper end surface of the body (111). The frame body (121) of the lower wire rack (13) cooperates with the lower end surface of the body (111). The left connecting portion (122) and the right connecting portion (126) are arranged on one side of the frame body (121) and are located on the tooth portion. The two sides of the (112) are matched with the side surfaces of the tooth portion (112), the left connecting portion (122) of the upper wire rack (12) is matched with the right connecting portion (126) of the lower wire rack (13), and the right connecting portion (126) of the upper wire rack (12) is matched with the left connecting portion (122) of the lower wire rack (13), and the two ends of the frame (121) are provided with square columns (123), and the square columns (123) are provided with V-shaped notches; The single-phase four-pole series-excited motor further includes a Hall element (7). The other side of the upper bracket (41) is provided with a mounting notch (414), a fixing hole (415), and a limiting column (417). One end of the Hall element (7) is engaged with the mounting notch (414), and the other end is fixed to the fixing hole (415). The other end of the Hall element (7) is sleeved on the limiting column (417).

2. The single-phase four-pole series motor according to claim 1, characterized in that: An inner stop (127) is provided on the inner side of the left connecting portion (122), and an outer stop (124) is provided on the outer side of the right connecting portion (126). The inner stop (127) of the upper wire rack (12) can correspond to the outer stop (124) of the lower wire rack (13), and the outer stop (124) of the upper wire rack (12) can correspond to the inner stop (127) of the lower wire rack (13).

3. The single-phase four-pole series motor according to claim 2, characterized in that: The upper line frame (12) further comprises a baffle (125), and the baffle (125) is arranged on the other side of the frame body (121).

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