Spliced stator structure and external rotor motor

Abstract

The utility model discloses a spliced stator structure and an external rotor motor, and the structure comprises a first iron core which is provided with a first inner yoke part and a plurality of first tooth parts, the plurality of first tooth parts are arranged at the periphery of the first inner yoke part at equal intervals in a surrounding manner, a first coil holder is sleeved on the first tooth parts, one end of each first tooth part is provided with a first outer yoke part, and the other end of each first tooth part is provided with a second coil holder; the first outer yoke parts are connected with the first inner yoke parts, and a first butt joint groove is formed between every two first outer yoke parts; the second iron core is provided with a second inner yoke part and a plurality of second tooth parts, the second tooth parts are arranged on the periphery of the second inner yoke part at equal intervals in a surrounding mode, the second tooth parts are sleeved with second coil holders, one end of each second tooth part is provided with a second outer yoke part, the second outer yoke parts are connected with the second inner yoke part, and a second butt joint groove is formed between every two outer yoke parts; the first inner yoke part is in butt joint with the second inner yoke part, the first outer yoke part is in butt joint with the second butt joint groove, the second outer yoke part is in butt joint with the first butt joint groove, and when the first iron core or the second iron core is wound independently, due to the fact that the distance between the first tooth parts or the distance between the second tooth parts is large, the winding difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of motors, and in particular to a composite stator structure and an external rotor motor. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy based on the principle of electromagnetic induction. It is widely used in industry, transportation, and home appliances. Its core function is to generate torque through the interaction of electromagnetic fields and electric current, thereby driving mechanical motion.

[0003] Electric motors are classified into internal rotor motors and external rotor motors. The core feature of an internal rotor motor is that the rotor is located inside the stator and is usually composed of permanent magnets or electromagnets, while the stator is composed of winding coils. An external rotor motor is a special type of motor in which the rotor is located outside the stator, the stator is fixed in the center, and the rotor is driven to rotate through the interaction of magnetic fields.

[0004] The stator is the stationary part of an electric motor, typically consisting of an iron core and windings. The iron core is made of laminated silicon steel sheets to reduce eddy current losses, and the windings generate a magnetic field when energized. In AC motors, the stator windings form a rotating magnetic field through three-phase currents; in DC motors, the stator may contain permanent magnets or electromagnets.

[0005] Motor stators typically employ a solid circular iron core structure, composed of multiple adjacent teeth. Each tooth ends in a shoe, and slots are formed between adjacent shoes. To facilitate winding, a sufficiently large slot size must be maintained between adjacent teeth to allow the winding equipment to pass smoothly and complete the winding process. Slots that are too small will lead to winding difficulties, low efficiency, and insufficient slot fill factor, while slots that are too large will cause an increase in cogging torque. Utility Model Content

[0006] In order to overcome the shortcomings of existing technology, the stator of external rotor motors generally uses a whole round iron core, which includes multiple adjacent teeth. In order to facilitate winding, a large slot is required between adjacent teeth. If the slot is too narrow, it will cause winding difficulties, low winding efficiency, and low slot fill factor. A large slot will also increase the cogging torque.

[0007] First aspect

[0008] This utility model provides a spliced ​​stator structure, including:

[0009] The first iron core is provided with a first inner yoke and a plurality of first teeth. The plurality of first teeth are equidistantly arranged around the outer periphery of the first inner yoke. A first wire frame is sleeved on the first teeth. A first outer yoke is provided at one end of the first teeth. The first outer yoke is connected to the first inner yoke. A first mating groove is provided between each pair of first outer yokes.

[0010] The second iron core has a second inner yoke and multiple second teeth. The multiple second teeth are equidistantly arranged around the outer periphery of the second inner yoke. A second wire frame is sleeved on the second teeth. A second outer yoke is provided at one end of the second teeth. The second outer yoke is connected to the second inner yoke. A second docking groove is provided between each pair of outer yokes. The first inner yoke docks with the second inner yoke, the first outer yoke docks with the second docking groove, and the second outer yoke docks with the first docking groove.

[0011] Optionally, the height of the first inner yoke is less than the height of the first outer yoke, the first inner yoke is located in the upper half of the first outer yoke, the height of the second inner yoke is less than the height of the first outer yoke, the second inner yoke is located in the lower half of the second outer yoke, the height of the first outer yoke and the second outer yoke are the same, and the sum of the heights of the first inner yoke and the second inner yoke is equal to the height of the first outer yoke or the second outer yoke.

[0012] Optionally, a first positioning groove is provided on the inner wall of the first inner yoke, and a second positioning groove is provided on the inner wall of the second inner yoke, with the positions of the first positioning groove and the second positioning groove corresponding.

[0013] Optionally, the other end of the first tooth is provided with a first boot portion, and the other end of the second tooth is provided with a second boot portion. There is a tooth groove between the first boot portion and the first outer yoke portion of the first tooth, and there is also a tooth groove between the second boot portion and the second outer yoke portion of the second tooth.

[0014] Optionally, a groove is provided between the first boot part and the second boot part, the width of which is 0.5mm to 1.5mm.

[0015] Optionally, the first line frame includes:

[0016] The first limiting ring is the same size as the first inner yoke and is aligned with the top of the first inner yoke.

[0017] Multiple first frames are equidistantly arranged around the outer periphery of the first limiting ring, each corresponding to a first tooth and having a first receiving groove, with the top of the first tooth located inside the first receiving groove.

[0018] Multiple second frames are provided, each corresponding to a first toothed part, and each has a second receiving groove. The bottom of the first toothed part is located in the second receiving groove, and the first receiving groove and the second receiving groove are connected to form a receiving cavity.

[0019] Optionally, the first frame is provided with a PIN pin connection groove and a first limiting part is provided at both ends of the first frame, and the second frame is provided with a PIN pin connection groove and a second limiting part is provided at both ends of the second frame.

[0020] Optionally, the second line frame includes:

[0021] The second limiting ring is the same size as the second inner yoke and is aligned with the top of the second inner yoke.

[0022] Multiple third frames are equidistantly arranged around the outer periphery of the second limiting ring, each corresponding to a second tooth and having a third receiving groove, with the bottom of the second tooth located within the third receiving groove.

[0023] Multiple fourth frames are provided, each corresponding to a second tooth and having a fourth receiving groove. The top of the second tooth is located in the fourth receiving groove, and the third receiving groove and the fourth receiving groove are connected to form a receiving cavity.

[0024] Optionally, the third frame is provided with a PIN pin connection groove, and the two ends of the third frame are respectively provided with a third limiting part; the fourth frame is provided with a PIN pin connection groove, and the two ends of the second frame are respectively provided with a fourth limiting part.

[0025] Second aspect

[0026] This utility model discloses an external rotor motor, including the assembled stator structure described in the first aspect.

[0027] The beneficial effects of this utility model are as follows: When winding the first iron core or the second iron core separately, the winding equipment can travel and wind within the large gap between the first teeth or the second teeth, which greatly reduces the difficulty of winding. Due to the increase in gap and the reduction in winding difficulty, it is easier to achieve high slot fill factor winding. In general, splitting the stator iron core into the first iron core and the second iron core, winding them separately and then connecting them greatly reduces the difficulty of winding and thus facilitates the improvement of slot fill factor after winding. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Figure 1 These are schematic diagrams of the assembled stator structure after winding in some embodiments;

[0030] Figure 2 These are assembly diagrams of the assembled stator structure in some embodiments;

[0031] Figure 3 These are structural breakdown diagrams of the assembled stator structure in some embodiments;

[0032] Figure 4 These are structural breakdown diagrams of the assembled stator structure in some embodiments;

[0033] Figure 5 These are structurally disassembled schematic diagrams of the first iron core in some embodiments;

[0034] Figure 6This is a structural breakdown diagram of the second iron core in some embodiments.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Assembled stator structure; 2. Enamelled wire; 3. First iron core; 301. First inner yoke; 302. First toothed section; 303. First wire frame; 304. First outer yoke; 305. First mating groove; 4. Second iron core; 401. Second inner yoke; 402. Second toothed section; 403. Second wire frame; 404. Second outer yoke; 405. Second mating groove; 306. First positioning groove; 406. Second positioning groove; 307. First shoe section; 407. Second boot part; 101, slot; 308, first limiting ring; 309, first frame sleeve; 310, first receiving groove; 311, second frame sleeve; 312, second receiving groove; 5, PIN pin connecting groove; 313, first limiting part; 314, second limiting part; 408, second limiting ring; 409, third frame sleeve; 410, third receiving groove; 411, fourth frame sleeve; 412, fourth receiving groove; 413, third limiting part; 414, fourth limiting part. Detailed Implementation

[0037] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0038] This utility model provides a spliced ​​stator structure 1, applied to the internal structure of a motor, serving as a stationary component inside the motor. When energized, it generates a magnetic field to drive the rotor to rotate. It includes: a first iron core 3, with a first inner yoke 301 and multiple first teeth 302. The multiple first teeth 302 are equidistantly arranged around the outer periphery of the first inner yoke 301. A first wire frame 303 is fitted onto each of the first teeth 302. A first outer yoke 304 is provided at one end of each first tooth 302, connecting to the first inner yoke 301. A first mating groove 305 is provided between each pair of first outer yokes 304. The second iron core 4 is provided with a second inner yoke 401 and a plurality of second teeth 402. The plurality of second teeth 402 are equidistantly arranged around the outer periphery of the second inner yoke 401. A second wire frame 403 is sleeved on the second teeth 402. A second outer yoke 404 is provided at one end of the second teeth 402. The second outer yoke 404 is connected to the second inner yoke 401. A second docking groove 405 is provided between each pair of outer yokes. The first inner yoke 301 docks with the second inner yoke 401, the first outer yoke 304 docks with the second docking groove 405, and the second outer yoke 404 docks with the first docking groove 305.

[0039] In implementation, a first wire frame 303 is installed on the first tooth 302 of the first iron core 3, and wire is wound on the first wire frame 303 of each first tooth 302, ultimately forming a winding on the first wire frame 303; similarly, a second wire frame 403 is installed on the second tooth 402 of the second iron core 4, and wire is wound on the second wire frame 403 of the second tooth 402, ultimately forming a winding on the second wire frame 403; when the first wire frame 303 on the first iron core 3 has a winding and the second wire frame 403 on the second iron core 4 has a winding, the winding is formed on the first wire frame 303 of the first iron core 3 and the second wire frame 403 of the second iron core 4. After the winding is formed on core 03, the first core 3 and the second core 4 are connected. First, the first inner yoke 301 is connected to the second inner yoke 401, the first outer yoke 304 is connected to the second connecting groove 405, and the second outer yoke 404 is connected to the first connecting groove 305. After connection, there is a second tooth 402 between each pair of first teeth 302, and similarly, there is a first tooth 302 between each pair of second teeth 402, finally forming a complete stator core with winding; This utility model In the provided composite stator structure 1, the composite stator structure 1 is divided into a first iron core 3 and a second iron core 4. During winding, the wire is wound on the first iron core 3 and the second iron core 4 respectively. Since the iron core needs to be joined together to form a complete iron core, the spacing between every two first teeth 302 of the first iron core 3 is larger than that between traditional stator teeth. Similarly, the spacing between every two second teeth 402 of the second iron core 4 is also larger than that between traditional stator teeth. When winding the first iron core 3 or the second iron core 4 separately, the winding equipment can travel within the large spacing due to the large spacing between the first teeth 302 or the second teeth 402, which greatly reduces the winding difficulty. Due to the increased spacing and the reduced winding difficulty, it is easier to achieve high slot fill factor winding. In summary, dividing the stator iron core into the first iron core 3 and the second iron core 4, winding them separately and then joining them together greatly reduces the winding difficulty and facilitates the improvement of the slot fill factor after winding.

[0040] Furthermore, the first inner yoke 301 is annular, and the first outer yoke 304 on the first toothed portion 302 is a portion extending to both sides from the end. The width of the first outer yoke 304 is greater than the width of the first toothed portion 302. The first outer yoke 304 and the first inner yoke 301 are integrally formed, and the first toothed portion 302 and the first outer yoke 304 are also integrally formed. The first iron core 3 is formed by stamping and riveting silicon steel sheets. Similarly, the second inner yoke 401 is annular, and the second outer yoke 404 on the second toothed portion 402 is a portion extending to both sides from the end. The width of the second outer yoke 404 is greater than the width of the second toothed portion 402. The second outer yoke 404 and the second inner yoke 401 are integrally formed, and the second toothed portion 402 and the second outer yoke 404 are also integrally formed. The second iron core 4 is formed by stamping and riveting silicon steel sheets.

[0041] In some embodiments, the height of the first inner yoke 301 is less than the height of the first outer yoke 304, the first inner yoke 301 is located in the upper half of the first outer yoke 304, the height of the second inner yoke 401 is less than the height of the first outer yoke 304, the second inner yoke 401 is located in the lower half of the second outer yoke 404, the first outer yoke 304 and the second outer yoke 404 have the same height, and the sum of the heights of the first inner yoke 301 and the second inner yoke 401 is equal to the height of the first outer yoke 304.

[0042] During implementation, after the first inner yoke 301 and the second inner yoke 401 are joined, the lower half of the first outer yoke 304 abuts against the side of the second inner yoke 401, and the upper half of the second outer yoke 404 abuts against the side wall of the first inner yoke 301. The total height of the first inner yoke 301 and the second inner yoke 401 after joining is the same as that of the first outer yoke 304 or the second outer yoke 404, so that the first outer yoke 304 and the second outer yoke 404 are equidistantly surrounding the side walls of the first inner yoke 301 and the second inner yoke 401, and after splicing, a complete stator core is formed.

[0043] Furthermore, the first inner yoke 301 and the second inner yoke 401 are annular. When the spliced ​​stator structure 1 provided by this utility model is installed on the motor, the first inner yoke 301 and the second inner yoke 401 are sleeved on the motor shaft. The height of the first inner yoke 301 is equal to half the height of the first outer yoke 304. The first inner yoke 301 is located in the upper half of the first outer yoke 304. The top of the first inner yoke 301 is flush with the top of the first outer yoke 304. The height of the second inner yoke 401 is equal to half the height of the second outer yoke 404. The bottom of the second inner yoke 401 is flush with the bottom of the second outer yoke 404. After docking, the bottom of the first inner yoke 301 abuts against the top of the second inner yoke 401. The top of the first inner yoke 301 is flush with the top of the second outer yoke 404. The bottom of the second inner yoke 401 is flush with the bottom of the first outer yoke 304, forming a stator core with complete inner and outer yokes.

[0044] In some embodiments, a first positioning groove 306 is provided on the inner wall of the first inner yoke 301, and a second positioning groove 406 is provided on the inner wall of the second inner yoke 401, with the positions of the first positioning groove 306 and the second positioning groove 406 corresponding.

[0045] When winding the first iron core 3 or the second iron core 4, it is necessary to position the first iron core 3 or the second iron core 4. A first positioning groove 306 is provided on the first inner yoke 301, which can be used to position the first iron core 3. Similarly, a second positioning groove 406 is provided on the second inner yoke 401, which can also be used to position the second iron core 4. The positions of the first positioning groove 306 and the second positioning groove 406 correspond. When connecting the first iron core 3 and the second iron core 4, they can also be spliced ​​according to the positions of the first positioning groove 306 and the second positioning groove 406. Moreover, positioning is also required when splicing the first iron core 3 and the second iron core 4. The first positioning groove 306 and the second positioning groove 406 can also play a positioning role when splicing the first iron core 3 and the second iron core 4.

[0046] In some embodiments, the other end of the first tooth 302 is provided with a first boot 307, and the other end of the second tooth 402 is provided with a second boot 407. There is a tooth groove between the first boot 307 and the first outer yoke 304 of the first tooth 302, and there is also a tooth groove between the second boot 407 and the second outer yoke 404 of the second tooth 402.

[0047] In practice, the first boot part 307 and the first outer yoke part 304 form a tooth groove on the first tooth part 302. After the first wire frame 303 is sleeved on the first tooth part 302, the wire is wound on the first wire frame 303, and the wire is located at the position corresponding to the tooth groove.

[0048] Furthermore, the first outer yoke 304 is the portion extending to both sides from one end of the first tooth 302, and the width of the first outer yoke 304 is greater than that of the first tooth 302. The second outer yoke 404 is the portion extending to both sides from one end of the second tooth 402, and the width of the second outer yoke 404 is also greater than that of the second tooth 402. The first boot portion 307 is the portion extending to both sides from the other end of the first tooth 302, and the width of the first boot portion 307 is greater than that of the first tooth 302. Grooves are formed on both sides of the first tooth 302. The second boot portion 407 is the portion extending to both sides from the other end of the second tooth 402, and grooves are formed on both sides of the second tooth 402.

[0049] Traditional stators require a large slot 101 between adjacent teeth to facilitate winding, that is, a large slot 101 between the shoe parts of each tooth. However, the large slot 101 increases the cogging torque.

[0050] In some embodiments, a groove 101 is provided between the first boot portion 307 and the second boot portion 407, the width of the groove 101 being 0.5mm to 1.5mm.

[0051] In practice, since the first iron core 3 and the second iron core 4 are wound separately in this application, there is a large gap between the first teeth 302 on the first iron core 3 and a large gap between the second teeth 402 on the second iron core 4. The width of the slot 101 of the first shoe 307 and the second shoe 407 after splicing can be preset. After the winding is completed, the first iron core 3 and the second iron core 4 are spliced ​​together, with the first teeth 302 and the second teeth 402 adjacent to each other. The first shoe 307 on the first tooth 302 and the second shoe 407 on the second tooth 402 have slots 101. The width of the slot 101 is in the range of 0.5mm to 1.5mm. The slot 101 is very small, which can greatly reduce the cogging torque. The first iron core 3 and the second iron core 4 are wound separately, and there is no need to consider increasing the width of the slot 101 between the first shoe 307 and the second shoe 407 for the convenience of winding.

[0052] In some embodiments, the first wire frame 303 includes: a first limiting ring 308, which is the same size as the first inner yoke 301 and is connected to the top of the first inner yoke 301; a plurality of first frame sleeves 309, which are equidistantly arranged around the outer periphery of the first limiting ring 308, each corresponding to a first tooth 302, and are provided with a first receiving groove 310, the top of the first tooth 302 being located in the first receiving groove 310; and a plurality of second frame sleeves 311, which correspond to a first tooth 302, and are provided with a second receiving groove 312, the bottom of the first tooth 302 being located in the second receiving groove 312, the first receiving groove 310 and the second receiving groove 312 being connected to form a receiving cavity.

[0053] During implementation, the first limiting ring 308 is aligned with the top of the first inner yoke 301, and each first sleeve 309 is aligned with each first tooth 302 one by one, so that the top of the first tooth 302 enters the first receiving groove 310 of the first sleeve 309. Each second sleeve 311 is also aligned with each first tooth 302 one by one, so that the bottom of the first tooth 302 enters the second receiving groove 312. After assembly, the first sleeve 309 and the second sleeve 311 are aligned on the first tooth 302, and the first receiving groove 310 and the second receiving groove 312 form a receiving cavity. The first tooth 302 is located in the receiving cavity. When winding, the wire can be wound on the first sleeve 309 and the second sleeve 311.

[0054] Furthermore, the first limiting ring 308 and the first frame 309 are connected as a single unit, and the multiple second frame 311 are each a separate component.

[0055] In some embodiments, the first sleeve 309 is provided with a PIN pin connection groove 5, and the two ends of the first sleeve 309 are respectively provided with a first limiting part 313. The second sleeve 311 is provided with a PIN pin connection groove 5, and the two ends of the second sleeve 311 are respectively provided with a second limiting part 314.

[0056] In practice, PIN pin connection slots 5 are provided on the first sleeve 309 and the second sleeve 311. When the assembled stator structure 1 provided in this application is installed in the motor, the motor is equipped with a PCB board. The PIN pins on the PCB board are connected to the PIN pin connection slots 5 to realize the electrical connection between the PCB board and the assembled stator structure 1. The first limiting part 313 and the second limiting part 314 are used to limit the winding wire.

[0057] In some embodiments, the second wire frame 403 includes: a second limiting ring 408, which is the same size as the second inner yoke 401 and abuts the top of the second inner yoke 401; a plurality of third sleeves 409, which are equidistantly arranged around the outer periphery of the second limiting ring 408, each corresponding to a second tooth 402, and are provided with a third receiving groove 410, the bottom of the second tooth 402 being located in the third receiving groove 410; and a plurality of fourth sleeves 411, which correspond to a second tooth 402, and are provided with a fourth receiving groove 412, the top of the second tooth 402 being located in the fourth receiving groove 412, and the third receiving groove 410 abuts with the fourth receiving groove to form a receiving cavity.

[0058] During implementation, the second limiting ring 408 is aligned with the bottom of the second inner yoke 401, and each third sleeve 409 is aligned with each second tooth 402 one by one, so that the bottom of the second tooth 402 enters the third receiving groove 410 of the third sleeve 409. Each fourth sleeve 411 is also aligned with each second tooth 402 one by one, so that the top of the second tooth 402 enters the fourth receiving groove 412. After assembly, the third sleeve 409 and the fourth sleeve 411 are aligned on the second tooth 402, and the third receiving groove 410 and the fourth receiving groove 412 form a receiving cavity. The second tooth 402 is located in the receiving cavity. When winding, the wire can be wound on the third sleeve 409 and the fourth sleeve 411.

[0059] Furthermore, the second limiting ring 408 and the third frame 409 are connected as a single unit, and the multiple fourth frame 411 are each separate components.

[0060] In some embodiments, the third frame 409 is provided with a PIN pin connection groove 5, and the two ends of the third frame 409 are respectively provided with a third limiting part 413. The fourth frame 411 is provided with a PIN pin connection groove 5, and the two ends of the second frame 311 are respectively provided with a fourth limiting part 414.

[0061] In practice, PIN pin connection slots 5 are provided on the third frame 409 and the fourth frame 411. After the assembled stator structure 1 provided in this application is installed in the motor, the motor is equipped with a PCB board. The PIN pins on the PCB board are connected to the PIN pin connection slots 5 to realize the electrical connection between the PCB board and the assembled stator structure 1. The third limiting part 413 and the fourth limiting part 414 are used to limit the winding wire.

[0062] This utility model provides an external rotor motor, including the assembled stator structure 1 in the above embodiments. The assembled stator structure 1 has been described in detail in the above embodiments and will not be repeated here. It should be noted that the assembled stator structure 1 described in the embodiments of this invention is applied to an external rotor motor.

[0063] During implementation, the assembled stator structure 1 is installed inside the motor. The stator inside the motor is usually wrapped with BMC (bulk molding compound) material to improve the stability, insulation, pressure resistance, mechanical strength and heat dissipation performance of the assembled stator structure 1.

[0064] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A composite stator structure, characterized in that, include: The first iron core is provided with a first inner yoke and a plurality of first teeth. The plurality of first teeth are equidistantly arranged around the outer periphery of the first inner yoke. A first wire frame is sleeved on the first teeth. A first outer yoke is provided at one end of the first teeth. The first outer yoke is connected to the first inner yoke. A first mating groove is provided between each pair of first outer yokes. The second iron core has a second inner yoke and multiple second teeth. The multiple second teeth are equidistantly arranged around the outer periphery of the second inner yoke. A second wire frame is sleeved on the second teeth. A second outer yoke is provided at one end of the second teeth. The second outer yoke is connected to the second inner yoke. A second docking groove is provided between each pair of outer yokes. The first inner yoke docks with the second inner yoke, the first outer yoke docks with the second docking groove, and the second outer yoke docks with the first docking groove.

2. The assembled stator structure according to claim 1, characterized in that, The height of the first inner yoke is less than the height of the first outer yoke, and the first inner yoke is located in the upper half of the first outer yoke. The height of the second inner yoke is less than the height of the first outer yoke, and the second inner yoke is located in the lower half of the second outer yoke. The heights of the first outer yoke and the second outer yoke are the same, and the sum of the heights of the first inner yoke and the second inner yoke is equal to the height of either the first outer yoke or the second outer yoke.

3. The assembled stator structure according to claim 1, characterized in that, The inner wall of the first inner yoke is provided with a first positioning groove, and the inner wall of the second inner yoke is provided with a second positioning groove, with the positions of the first positioning groove and the second positioning groove corresponding.

4. The assembled stator structure according to claim 1, characterized in that, The other end of the first tooth is provided with a first boot part, and the other end of the second tooth is provided with a second boot part. There is a tooth groove between the first boot part and the first outer yoke part of the first tooth, and there is also a tooth groove between the second boot part and the second outer yoke part of the second tooth.

5. The assembled stator structure according to claim 1, characterized in that, There is a groove between the first boot part and the second boot part, and the width of the groove is 0.5mm to 1.5mm.

6. The assembled stator structure according to claim 1, characterized in that, The first line frame includes: The first limiting ring is the same size as the first inner yoke and is aligned with the top of the first inner yoke. Multiple first frames are equidistantly arranged around the outer periphery of the first limiting ring, each corresponding to a first tooth and having a first receiving groove, with the top of the first tooth located inside the first receiving groove. Multiple second frames are provided, each corresponding to a first toothed part, and each has a second receiving groove. The bottom of the first toothed part is located in the second receiving groove, and the first receiving groove and the second receiving groove are connected to form a receiving cavity.

7. The assembled stator structure according to claim 6, characterized in that, The first frame is provided with a PIN pin connection groove, and the two ends of the first frame are respectively provided with a first limiting part. The second frame is provided with a PIN pin connection groove, and the two ends of the second frame are respectively provided with a second limiting part.

8. The assembled stator structure according to claim 1, characterized in that, The second line frame includes: The second limiting ring is the same size as the second inner yoke and is aligned with the top of the second inner yoke. Multiple third frames are equidistantly arranged around the outer periphery of the second limiting ring, each corresponding to a second tooth and having a third receiving groove, with the bottom of the second tooth located within the third receiving groove. Multiple fourth frames are provided, each corresponding to a second tooth and having a fourth receiving groove. The top of the second tooth is located in the fourth receiving groove, and the third receiving groove and the fourth receiving groove are connected to form a receiving cavity.

9. The assembled stator structure according to claim 8, characterized in that, The third frame is provided with a PIN pin connection groove, and the two ends of the third frame are respectively provided with a third limiting part. The fourth frame is provided with a PIN pin connection groove, and the two ends of the second frame are respectively provided with a fourth limiting part.

10. An external rotor motor, characterized in that, Includes the assembled stator structure as described in any one of claims 1 to 9.

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