Motor and portable fan

Abstract

The utility model relates to the technical field of electromechanical equipment, in particular to a motor and a portable fan. The motor comprises a stator assembly and a rotor assembly which are coaxially arranged, the rotor assembly can rotate relative to the stator assembly, the stator assembly comprises a stator iron core and a winding wire, the stator iron core is annularly provided with a plurality of winding parts, the winding wire is wound on the winding parts, each winding part comprises a plurality of overlapped magnetic conductive parts, and the rotor assembly comprises a magnet annularly arranged outside the stator assembly. And the axial length of the magnet is greater than the total thickness of the plurality of overlapped magnetic conductive pieces. Due to the fact that the axial length of the magnet is larger than the total thickness of the multiple overlapped magnetic conduction pieces, magnetic leakage at the ends of the magnet can be reduced, a magnetic circuit can be better closed, and therefore the effective utilization proportion of magnetic flux is improved. And meanwhile, the magnetic circuit is more complete, the magnetic flux density distribution is more uniform, the magnetic flux utilization rate is improved, the magnetic flux can be fully used for generating the torque of the motor, the motor can generate higher output power under lower energy consumption, and the performance of the motor is effectively improved.

Description

[Technical Field]

[0001] This utility model relates to the field of electromechanical equipment technology, and in particular to a motor and a portable fan. [Background Technology]

[0002] Silicon steel sheets in a motor form part of the magnetic circuit, and their total thickness affects the motor's magnetic flux and efficiency. The axial length of the rotor magnetic ring is crucial for the sealing of the magnetic circuit; magnetic leakage will affect magnetic flux utilization and thus motor efficiency. How to adjust and improve the dimensional relationship between the silicon steel sheets and the rotor magnetic ring to enhance magnetic flux utilization and achieve better motor performance, thus better suited to powering electromechanical equipment, especially portable fans, is a pressing issue that needs to be addressed. [Utility Model Content]

[0003] To solve the above problems, this utility model provides a motor and a portable fan.

[0004] To solve the above-mentioned technical problems, this utility model provides an electric motor in one embodiment. The electric motor includes a stator assembly and a rotor assembly arranged coaxially. The rotor assembly is rotatable relative to the stator assembly. The stator assembly includes a stator core and windings. The stator core is provided with a plurality of winding portions. The windings are wound on the winding portions. The winding portions include a plurality of stacked magnetic conductive elements. The rotor assembly includes a magnet arranged around the stator assembly. The axial length of the magnet is greater than the total thickness of the plurality of stacked magnetic conductive elements.

[0005] Preferably, the magnetic conductive element is a silicon steel sheet, and the axial length of the magnet is between 11 mm and 13 mm; the total thickness of the multiple stacked silicon steel sheets is between 7.5 mm and 9.5 mm.

[0006] Preferably, the magnetization amount of the magnet is between 1100 Gauss and 1300 Gauss; the outer diameter of the magnet is between 25.2 mm and 27.2 mm; and the inner diameter of the magnet is between 21.8 mm and 23.8 mm.

[0007] Preferably, the diameter of the stator assembly is between 21 mm and 23 mm, the distance between two opposite winding portions is between 12 mm and 14 mm, the wire diameter of the winding is between 0.45 mm and 0.47 mm, and the number of winding portions is 6, 8, or 9.

[0008] Preferably, the motor further includes a boss, a first through hole is formed in the center of the stator core, the boss passes through the first through hole and is fixedly connected to the stator core, the boss has a second through hole, the rotor assembly further includes a shaft, a rotating seat and two bearings, the two bearings are respectively disposed at both ends in the second through hole, the shaft passes through the two bearings and one end extends out of the boss, the rotating seat is fixedly connected to the end of the shaft extending out of the boss, and the rotating seat is fixedly connected to the magnet.

[0009] Preferably, the diameter of the first through hole is between 10 mm and 12 mm; the diameter of the second through hole is between 8.6 mm and 10.6 mm.

[0010] Preferably, the rotating seat has a receiving groove on the side near the boss, the boss extends into the receiving groove, the stator assembly and the magnet are located in the receiving groove, the magnet is fixedly connected to the inner sidewall of the receiving groove, and one end of the rotating shaft extending out of the boss is fixedly connected to the inner bottom wall of the receiving groove.

[0011] Preferably, the depth of the receiving groove is greater than or equal to the axial length of the magnet, and a gap is left between the magnetic conductor and the groove opening and the inner bottom wall of the receiving groove; the receiving groove also includes a connecting part, the connecting part protrudes towards the boss, the connecting part has a connecting cavity corresponding to the rotating shaft, and one end of the rotating shaft extending out of the boss is inserted into the connecting cavity.

[0012] Preferably, an elastic element is sleeved on the rotating shaft, one end of which abuts against the receiving groove, and the other end abuts against the bearing facing the receiving groove.

[0013] To solve the above-mentioned technical problems, this utility model provides a portable fan in another embodiment. The portable fan includes a main body and the motor described above. A cavity is formed inside the main body, and the motor is disposed inside the cavity. The rotor assembly includes a rotating base, which is a mixed-flow fan, an axial-flow fan, or a centrifugal fan.

[0014] Compared with the prior art, the motor and portable fan of this utility model have the following advantages:

[0015] 1. In one embodiment of this utility model, the motor includes a stator assembly and a rotor assembly coaxially arranged. The rotor assembly is rotatable relative to the stator assembly. The stator assembly includes a stator core and windings. The stator core is surrounded by multiple winding portions, and the windings are wound around the winding portions. Each winding portion includes multiple stacked magnetic conductive elements. The rotor assembly includes a magnet surrounding the stator assembly. The axial length of the magnet is greater than the total thickness of the stacked magnetic conductive elements. Because the axial length of the magnet is greater than the total thickness of the stacked magnetic conductive elements, leakage flux at the magnet ends is reduced, and the magnetic circuit is better sealed, thereby improving the effective utilization rate of magnetic flux. At the same time, the axial length of the magnet being greater than the total thickness of the stacked magnetic conductive elements ensures a more complete magnetic circuit, ensuring effective conduction of magnetic flux and making the magnetic flux density distribution more uniform, thereby improving the magnetic flux utilization rate. The improved magnetic flux utilization rate allows the magnetic flux to be fully used to generate the motor torque, enabling the motor to produce greater output power with less energy consumption, thereby improving the motor performance.

[0016] 2. In one embodiment of this utility model, the magnetic conductor is a silicon steel sheet, and the axial length of the magnet is between 11 mm and 13 mm; the total thickness of the multiple stacked silicon steel sheets is between 7.5 mm and 9.5 mm. The total thickness of the silicon steel sheet is an important technical parameter. If the total thickness of the silicon steel sheet is too thick, eddy current losses will increase, leading to increased iron losses in the motor, reduced efficiency, and increased heat generation in the motor. Excessive thickness also increases volume and causes structural redundancy. However, if the total thickness of the silicon steel sheet is insufficient, causing the magnetic flux density to reach the saturation magnetic flux density of the silicon steel sheet, excess magnetic force cannot be effectively conducted through the silicon steel sheet, forming leakage flux, which also leads to reduced motor efficiency. A total thickness of 7.5 mm to 9.5 mm for the silicon steel sheet can reduce eddy current losses, improve motor efficiency, and simultaneously ensure sufficient magnetic flux density within a small volume. The axial length of the magnet is between 11mm and 13mm, slightly larger than the total thickness of the corresponding silicon steel sheet. This allows for more effective sealing of the magnetic circuit, reducing magnetic leakage and thus improving the motor's magnetic efficiency. This design matches the total thickness of the silicon steel sheet with the axial length of the magnet, enabling a more compact structure to meet the motor's size and performance requirements while reducing eddy current losses, ensuring sufficient magnetic flux density, and achieving better motor performance. Furthermore, the dimensions of the silicon steel sheet and magnet are suitable for use in portable fans.

[0017] 3. In one embodiment of this utility model, the magnetization amount of the magnet is between 1100 Gauss and 1300 Gauss; the outer diameter of the magnet is between 25.2 mm and 27.2 mm; and the inner diameter of the magnet is between 21.8 mm and 23.8 mm. By setting the magnetization amount of the magnet between 1100 Gauss and 1300 Gauss, the eddy current loss of the motor can be reduced, and the overall operating efficiency and performance of the motor can be improved. The outer and inner diameter dimensions of the magnet, as described above, can be matched with the axial length of the magnet, providing the required geometric dimensions and magnetic field strength.

[0018] 4. In one embodiment of this utility model, the stator assembly has a diameter between 21mm and 23mm, and the distance between two opposing winding sections is between 12mm and 14mm; the wire diameter is between 0.45mm and 0.47mm; and the number of winding sections is 6, 8, or 9. A stator assembly diameter between 21mm and 23mm helps concentrate magnetic flux and improve the motor's magnetic efficiency. A distance between 12mm and 14mm between opposing winding sections helps reduce electromagnetic interference between windings, thereby reducing copper losses. Setting the wire diameter between 0.45mm and 0.47mm adapts to the motor's power supply requirements. The number of winding sections (6, 8, or 9) can be selected according to different power requirements; an appropriate number of winding sections can further improve the motor's electromagnetic performance.

[0019] 5. In one embodiment of this utility model, the motor further includes a boss. A first through hole is formed in the center of the stator core, through which the boss is fixedly connected to the stator core. The boss also has a second through hole. The rotor assembly further includes a shaft, a rotating seat, and two bearings. The two bearings are respectively disposed at both ends within the second through hole. The shaft passes through the two bearings and extends out of the boss at one end. The rotating seat is fixedly connected to the end of the shaft extending out of the boss and is fixedly connected to a magnet. By forming the first through hole, the boss and the stator core are assembled, improving the stability of the fixed connection between the motor and the boss. The bearings are disposed within the second through hole, reducing friction during shaft rotation and lowering energy consumption, thus improving motor efficiency. The bearings also maintain stable shaft rotation, reducing vibration and noise. Since the rotating seat is fixedly connected to the magnet, and one end of the shaft is connected to the rotating seat, the rotation of the magnet can drive the rotating seat to rotate, thereby achieving the blowing function of accelerating airflow.

[0020] 6. In one embodiment of this utility model, the diameter of the first through hole is between 10mm and 12mm; the diameter of the second through hole is between 8.6mm and 10.6mm. Through the above-mentioned dimensional design, the boss can be fixedly connected to the motor, while also accommodating the normal rotation of the shaft and bearing, and ensuring sufficient mechanical strength.

[0021] 7. In one embodiment of this utility model, a receiving groove is provided on the side of the rotating seat near the boss. The boss extends into the receiving groove, and the stator assembly and magnet are located inside the receiving groove. The magnet is fixedly connected to the inner sidewall of the receiving groove, and one end of the rotating shaft extending out of the boss is fixedly connected to the inner bottom wall of the receiving groove. By providing the receiving groove, the receiving groove protects and accommodates the stator assembly and magnet, and reduces noise. The magnet is fixedly connected to the inner sidewall of the receiving groove, and one end of the rotating shaft extending out of the boss is fixedly connected to the inner bottom wall of the receiving groove, so that the rotating seat, magnet, and rotating shaft can achieve co-rotation with a high connection strength.

[0022] 8. In one embodiment of this utility model, the depth of the receiving groove is greater than or equal to the axial length of the magnet, and gaps are left between the magnetic guide and the groove opening and inner bottom wall of the receiving groove. The receiving groove also includes a connecting part, which protrudes towards the boss and has a connecting cavity corresponding to the rotating shaft. One end of the rotating shaft extending out of the boss is inserted into the connecting cavity. Since the depth of the receiving groove is greater than or equal to the axial length of the magnet, and the axial length of the magnet is greater than the total thickness of multiple stacked magnetic guides, the receiving groove has sufficient depth to accommodate the magnet and the magnetic guide. Gaps are left between the magnetic guide and the groove opening and inner bottom wall of the receiving groove. These gaps further limit the total thickness of the magnetic guide, reducing eddy current losses and improving magnetic flux utilization. The gaps also ensure a safe distance between the stator assembly and the rotating base, improving the safety of the portable fan operation. Since the connecting part protrudes towards the boss and has a connecting cavity corresponding to the rotating shaft, the protruding shape of the connecting part allows the connecting cavity to have a deeper depth, improving the connection strength of the rotating shaft inserted into the connecting cavity and achieving a tight connection between the rotating base and the rotating shaft.

[0023] 9. In one embodiment of this utility model, an elastic element is sleeved on the rotating shaft. One end of the elastic element abuts against the receiving groove, and the other end abuts against the bearing facing the receiving groove. The two ends of the elastic element abut against the rotating seat and the bearing respectively, and can rotate together with the rotating seat and the bearing. The elastic element can prevent the rotating seat from vibrating in the axial direction with its elastic force, which helps to reduce working noise and improve the user experience.

[0024] 10. In one embodiment of this utility model, the portable fan includes a main body and the aforementioned motor. A chamber is formed within the main body, and the motor is disposed within the chamber. The rotor assembly includes a rotating base, which can be a diagonal-flow fan, an axial-flow fan, or a centrifugal fan. The chamber provides housing space for the motor. The rotor assembly, including the rotating base, can accelerate airflow in the axial and / or radial directions. The portable fan with the aforementioned motor has the advantages of powerful performance and quiet operation. [Attached Image Description]

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the motor provided in the first embodiment of this utility model.

[0027] Figure 2 This is an exploded structural diagram of the motor provided in the first embodiment of this utility model.

[0028] Figure 3 This is a cross-sectional structural diagram of the stator assembly and magnet of the motor provided in the first embodiment of the present invention.

[0029] Figure 4 This is a front view of the stator assembly, boss, and bearing assembly of the motor provided in the first embodiment of this utility model.

[0030] Figure 5 This is a cross-sectional structural diagram of the motor provided in the first embodiment of this utility model.

[0031] Figure 6 This is a three-dimensional structural diagram of the portable fan provided in the second embodiment of this utility model.

[0032] Figure 7 This is a partial cross-sectional structural diagram of the portable fan provided in the second embodiment of the present invention.

[0033] Explanation of reference numerals in the attached diagram:

[0034] 1. Electric motor;

[0035] 20. Stator assembly; 21. Stator core; 22. Winding; 23. Winding section; 30. Rotor assembly; 31. Magnet; 32. Shaft; 33. Rotating seat; 34. Bearing; 35. Elastic element; 40. Boss; 41. Second through hole;

[0036] 100. Portable fan; 110. Main body; 111. Chamber; 211. First through hole; 230. Magnetic conductor; 231. Silicon steel sheet; 331. Receiving groove; 332. Gap;

[0037] 3311. Connecting part; 3312. Connecting cavity.

Detailed Implementation Methods

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0043] Please combine Figures 1 to 3 The first embodiment of this utility model provides a motor 1, which includes a stator assembly 20 and a rotor assembly 30 arranged coaxially. The rotor assembly 30 is rotatable relative to the stator assembly 20. The stator assembly 20 includes a stator core 21 and windings 22. The stator core 21 is surrounded by a plurality of winding portions 23, and the windings 22 are wound on the winding portions 23. The winding portions 23 include a plurality of stacked magnetic conductive elements 230. The rotor assembly 30 includes a magnet 31 arranged around the stator assembly 20. The axial length of the magnet 31 is greater than the total thickness of the plurality of stacked magnetic conductive elements 230.

[0044] Understandably, if the axial length of the magnet 31 is defined as D, and the total thickness of the multiple stacked magnetic conductive elements 230 is defined as d, then D > d. Since the axial length of the magnet 31 is greater than the total thickness of the multiple stacked magnetic conductive elements 230, leakage flux at the ends of the magnet 31 will be reduced, allowing for better sealing of the magnetic circuit and thus improving the effective utilization rate of magnetic flux. Simultaneously, the greater axial length of the magnet 31 ensures a more complete magnetic circuit, ensuring effective conduction of magnetic flux and resulting in a more uniform magnetic flux density distribution, thereby improving magnetic flux utilization. This increased magnetic flux utilization allows the magnetic flux to be fully utilized to generate the torque of the motor 1, enabling the motor 1 to produce greater output power with lower energy consumption, thus improving the performance of the motor 1.

[0045] It should be noted that the magnetic conductive component 230 can be made of silicon steel sheet 231, or it can be made of iron-nickel alloy, amorphous alloy, etc., and there is no limitation here.

[0046] Please see Figure 3 Furthermore, the magnetic conductor 230 is a silicon steel sheet 231, and the axial length of the magnet 31 is between 11 mm and 13 mm; the total thickness of the multiple stacked silicon steel sheets 231 is between 7.5 mm and 9.5 mm.

[0047] Understandably, 11mm ≤ D ≤ 13mm, 7.5mm ≤ d ≤ 9.5mm. The total thickness of the silicon steel sheet 231 is an important technical parameter. If the total thickness of the silicon steel sheet 231 is too thick, eddy current losses will increase, leading to increased iron losses in motor 1, reduced efficiency, and increased heat generation in motor 1. Excessive thickness of the silicon steel sheet 231 will also increase volume, causing structural redundancy. However, if the total thickness of the silicon steel sheet 231 is insufficient, causing the magnetic flux density to reach the saturation magnetic flux density of the silicon steel sheet 231, excess magnetic force cannot be effectively conducted through the silicon steel sheet 231, forming leakage flux, which will also lead to reduced efficiency of motor 1. A total thickness of 7.5mm to 9.5mm for the silicon steel sheet 231 can reduce eddy current losses, improve the efficiency of motor 1, and simultaneously ensure sufficient magnetic flux density can be accommodated in a smaller volume. The axial length of magnet 31 is between 11 mm and 13 mm, slightly larger than the total thickness of the corresponding silicon steel sheet 231. This allows for more effective sealing of the magnetic circuit, reducing magnetic leakage and thus improving the magnetic efficiency of motor 1. This design matches the total thickness of silicon steel sheet 231 with the axial length of magnet 31, enabling a more compact structure to meet the size and performance requirements of motor 1 while reducing eddy current losses, ensuring sufficient magnetic flux density, and achieving better motor 1 performance. Furthermore, the dimensions of silicon steel sheet 231 and magnet 31 are more suitable for installation within portable fan 100.

[0048] Optionally, as one specific embodiment, the axial length D of the magnet 31 is 12 mm; the total thickness d of the multiple stacked silicon steel sheets 231 is 8.5 mm.

[0049] Please combine Figure 2 and Figure 3 Furthermore, the magnetization of magnet 31 is between 1100 Gauss and 1300 Gauss; the outer diameter of magnet 31 is between 25.2 mm and 27.2 mm; and the inner diameter of magnet 31 is between 21.8 mm and 23.8 mm.

[0050] Understandably, by setting the magnetization amount of magnet 31 between 1100 Gauss and 1300 Gauss, the eddy current loss of motor 1 can be reduced, improving the overall operating efficiency and performance of motor 1. The outer diameter of magnet 31 is defined as R, and the inner diameter as r; 25.2mm ≤ R ≤ 27.2mm, 21.8mm ≤ r ≤ 23.8mm. Through the above setting of the outer and inner diameter dimensions of magnet 31, it can be matched with the axial length of magnet 31, providing the required geometric dimensions and magnetic field strength.

[0051] Optionally, as one specific implementation, the magnetization amount of magnet 31 is 1200 Gauss.

[0052] Optionally, as one specific embodiment, the outer diameter R of the magnet 31 is 26.2 mm; the inner diameter r of the magnet 31 is 22.8 mm.

[0053] Please combine Figure 2 and Figure 4 Furthermore, the diameter of the stator assembly 20 is between 21 mm and 23 mm, the spacing between the two opposing winding portions 23 is between 12 mm and 14 mm, the wire diameter of the winding 22 is between 0.45 mm and 0.47 mm, and the number of winding portions 23 is 6, 8, or 9.

[0054] Understandably, the diameter of the stator assembly 20 is defined as H, and the distance between the two opposing winding portions 23 is defined as h; 21 mm ≤ H ≤ 23 mm, 12 mm ≤ h ≤ 14 mm. A stator assembly 20 diameter between 21 mm and 23 mm helps concentrate magnetic flux and improve the magnetic efficiency of the motor 1. A distance between the two opposing winding portions 23 between 12 mm and 14 mm helps reduce electromagnetic interference between windings, thereby reducing copper losses. Setting the wire diameter of the windings 22 between 0.45 mm and 0.47 mm adapts to the power supply requirements of the motor 1. A greater number of winding portions 23 results in higher output power, but also increases heat loss. Depending on different power requirements, different numbers of winding portions 23 can be selected, such as 6, 8, or 9. Considering the balance between the performance and efficiency of the motor 1, an appropriate number of winding portions 23 can further improve the performance of the motor 1.

[0055] Optionally, as one specific embodiment, the diameter H of the stator assembly 20 is 22 mm; the distance h between the two opposing winding portions 23 is 13 mm.

[0056] Optionally, as one specific embodiment, the wire diameter of the winding 22 is 0.45mm or 0.47mm.

[0057] Please combine Figure 2 , Figure 4 and Figure 5 Furthermore, the motor 1 also includes a boss 40, and a first through hole 211 is provided in the center of the stator core 21. The boss 40 passes through the first through hole 211 and is fixedly connected to the stator core 21. The boss 40 is provided with a second through hole 41. The rotor assembly 30 also includes a rotating shaft 32, a rotating seat 33 and two bearings 34. The two bearings 34 are respectively provided at both ends in the second through hole 41. The rotating shaft 32 passes through the two bearings 34 and one end extends out of the boss 40. The rotating seat 33 is fixedly connected to the end of the rotating shaft 32 that extends out of the boss 40. The rotating seat 33 is fixedly connected to the magnet 31.

[0058] Understandably, by opening the first through hole 211, the boss 40 and the stator core 21 are assembled, improving the stability of the fixed connection between the motor 1 and the boss 40. The bearing 34 is set in the second through hole 41, reducing the friction when the shaft 32 rotates, and can reduce energy consumption and improve the efficiency of the motor 1; the bearing 34 can also maintain the stable rotation of the shaft 32, reducing vibration and noise. Since the rotating seat 33 is fixedly connected to the magnet 31, and one end of the shaft 32 is connected to the rotating seat 33, the rotation of the magnet 31 can drive the rotating seat 33 to rotate, thereby realizing the blowing function of accelerating airflow.

[0059] Please combine Figure 2 and Figure 4Furthermore, the diameter of the first through hole 211 is between 10 mm and 12 mm; the diameter of the second through hole 41 is between 8.6 mm and 10.6 mm.

[0060] Understandably, the diameter of the first through hole 211 is defined as L1, and the diameter of the second through hole 41 is defined as L2; ​​10mm ≤ L1 ≤ 12mm, 8.6mm ≤ L2 ≤ 10.6mm. The diameter of the first through hole 211 is between 10mm and 12mm; the diameter of the second through hole 41 is between 8.6mm and 10.6mm. Through the above dimensional design, the boss 40 can be fixedly connected to the motor 1, while also accommodating the normal rotation of the shaft 32 and the bearing 34, and ensuring sufficient mechanical strength.

[0061] Optionally, as one specific embodiment, the diameter L1 of the first through hole 211 is 11 mm; the diameter L2 of the second through hole 41 is 9.6 mm.

[0062] Please combine Figure 2 and Figure 5 Furthermore, the rotating seat 33 has a receiving groove 331 on the side near the boss 40, the boss 40 extends into the receiving groove 331, the stator assembly 20 and the magnet 31 are located in the receiving groove 331, the magnet 31 is fixedly connected to the inner side wall of the receiving groove 331, and the end of the rotating shaft 32 extending out of the boss 40 is fixedly connected to the inner bottom wall of the receiving groove 331.

[0063] Understandably, by opening the receiving groove 331, the receiving groove 331 plays a role in protecting and containing the stator assembly 20 and the magnet 31 and reducing noise. The magnet 31 is fixedly connected to the inner side wall of the receiving groove 331, and one end of the rotating shaft 32 extending out of the boss 40 is fixedly connected to the inner bottom wall of the receiving groove 331, so that the rotating seat 33, the magnet 31 and the rotating shaft 32 can achieve co-rotation with a high connection strength.

[0064] Please continue to combine Figure 2 and Figure 5 Furthermore, the depth of the receiving groove 331 is greater than or equal to the axial length of the magnet 31, and a gap 332 is left between the magnetic conductor 230 and the groove opening and inner bottom wall of the receiving groove 331; the receiving groove 331 also includes a connecting part 3311, which protrudes toward the boss 40, and the connecting part 3311 has a connecting cavity 3312 corresponding to the rotating shaft 32, and one end of the rotating shaft 32 extending out of the boss 40 is inserted into the connecting cavity 3312.

[0065] Understandably, since the depth of the receiving groove 331 is greater than or equal to the axial length of the magnet 31, and the axial length of the magnet 31 is greater than the total thickness of the multiple stacked magnetic conductive elements 230, the receiving groove 331 has sufficient depth to accommodate the magnet 31 and the magnetic conductive elements 230. A gap 332 is left between the magnetic conductive elements 230 and the groove opening and inner bottom wall of the receiving groove 331. This gap 332 further limits the total thickness of the magnetic conductive elements 230, reducing eddy current losses and improving magnetic flux utilization. The gap 332 also ensures a safe distance between the stator assembly 20 and the rotating seat 33, enhancing safety during rotation. Because the connecting part 3311 protrudes towards the boss 40, and the connecting part 3311 has a connecting cavity 3312 corresponding to the rotating shaft 32, the protruding shape of the connecting part 3311 allows the connecting cavity 3312 to have a deeper cavity depth, increasing the connection strength of the rotating shaft 32 inserted into the connecting cavity 3312, and achieving a tight connection between the rotating seat 33 and the rotating shaft 32.

[0066] Please combine Figure 2 and Figure 5 Furthermore, an elastic element 35 is sleeved on the rotating shaft 32. One end of the elastic element 35 abuts against the receiving groove 331, and the other end abuts against the bearing 34 facing the receiving groove 331.

[0067] Understandably, the elastic element 35 abuts against the rotating seat 33 and the bearing 34 at both ends, and can rotate together with the rotating seat 33 and the bearing 34. The elastic element 35 can prevent the rotating seat 33 from vibrating in the axial direction with its elastic force, which helps to reduce working noise and improve the user experience.

[0068] Optionally, the elastic element 35 is a spring.

[0069] Please combine Figure 6 and Figure 7 The second embodiment of this utility model provides a portable fan 100. The portable fan 100 includes a main body 110 and a motor 1 as in the first embodiment of this utility model. A chamber 111 is provided in the main body 110, and the motor 1 is disposed in the chamber 111. The rotor assembly 30 includes a rotating seat 33, which is a mixed flow fan, an axial flow fan, or a centrifugal fan.

[0070] Understandably, chamber 111 provides housing space for motor 1, and rotor assembly 30 includes a rotating base 33, which, when it is a mixed-flow fan, axial fan, or centrifugal fan, can accelerate airflow in the axial and / or radial directions. Portable fan 100 using the above-described motor 1 has the advantages of powerful performance and quiet operation.

[0071] Compared with the prior art, the motor and portable fan of this utility model have the following advantages:

[0072] 1. In one embodiment of this utility model, the motor includes a stator assembly and a rotor assembly coaxially arranged. The rotor assembly is rotatable relative to the stator assembly. The stator assembly includes a stator core and windings. The stator core is surrounded by multiple winding portions, and the windings are wound around the winding portions. Each winding portion includes multiple stacked magnetic conductive elements. The rotor assembly includes a magnet surrounding the stator assembly. The axial length of the magnet is greater than the total thickness of the stacked magnetic conductive elements. Because the axial length of the magnet is greater than the total thickness of the stacked magnetic conductive elements, leakage flux at the magnet ends is reduced, and the magnetic circuit is better sealed, thereby improving the effective utilization rate of magnetic flux. At the same time, the axial length of the magnet being greater than the total thickness of the stacked magnetic conductive elements ensures a more complete magnetic circuit, ensuring effective conduction of magnetic flux and making the magnetic flux density distribution more uniform, thereby improving the magnetic flux utilization rate. The improved magnetic flux utilization rate allows the magnetic flux to be fully used to generate the motor torque, enabling the motor to produce greater output power with less energy consumption, thereby improving the motor performance.

[0073] 2. In one embodiment of this utility model, the magnetic conductor is a silicon steel sheet, and the axial length of the magnet is between 11 mm and 13 mm; the total thickness of the multiple stacked silicon steel sheets is between 7.5 mm and 9.5 mm. The total thickness of the silicon steel sheet is an important technical parameter. If the total thickness of the silicon steel sheet is too thick, eddy current losses will increase, leading to increased iron losses in the motor, reduced efficiency, and increased heat generation in the motor. Excessive thickness also increases volume and causes structural redundancy. However, if the total thickness of the silicon steel sheet is insufficient, causing the magnetic flux density to reach the saturation magnetic flux density of the silicon steel sheet, excess magnetic force cannot be effectively conducted through the silicon steel sheet, forming leakage flux, which also leads to reduced motor efficiency. A total thickness of 7.5 mm to 9.5 mm for the silicon steel sheet can reduce eddy current losses, improve motor efficiency, and simultaneously ensure sufficient magnetic flux density within a small volume. The axial length of the magnet is between 11mm and 13mm, slightly larger than the total thickness of the corresponding silicon steel sheet. This allows for more effective sealing of the magnetic circuit, reducing magnetic leakage and thus improving the motor's magnetic efficiency. This design matches the total thickness of the silicon steel sheet with the axial length of the magnet, enabling a more compact structure to meet the motor's size and performance requirements while reducing eddy current losses, ensuring sufficient magnetic flux density, and achieving better motor performance. Furthermore, the dimensions of the silicon steel sheet and magnet are suitable for use in portable fans.

[0074] 3. In one embodiment of this utility model, the magnetization amount of the magnet is between 1100 Gauss and 1300 Gauss; the outer diameter of the magnet is between 25.2 mm and 27.2 mm; and the inner diameter of the magnet is between 21.8 mm and 23.8 mm. By setting the magnetization amount of the magnet between 1100 Gauss and 1300 Gauss, the eddy current loss of the motor can be reduced, and the overall operating efficiency and performance of the motor can be improved. The outer and inner diameter dimensions of the magnet, as described above, can be matched with the axial length of the magnet, providing the required geometric dimensions and magnetic field strength.

[0075] 4. In one embodiment of this utility model, the stator assembly has a diameter between 21mm and 23mm, and the distance between two opposing winding sections is between 12mm and 14mm; the wire diameter is between 0.45mm and 0.47mm; and the number of winding sections is 6, 8, or 9. A stator assembly diameter between 21mm and 23mm helps concentrate magnetic flux and improve the motor's magnetic efficiency. A distance between 12mm and 14mm between opposing winding sections helps reduce electromagnetic interference between windings, thereby reducing copper losses. Setting the wire diameter between 0.45mm and 0.47mm adapts to the motor's power supply requirements. The number of winding sections (6, 8, or 9) can be selected according to different power requirements; an appropriate number of winding sections can further improve the motor's electromagnetic performance.

[0076] 5. In one embodiment of this utility model, the motor further includes a boss. A first through hole is formed in the center of the stator core, through which the boss is fixedly connected to the stator core. The boss also has a second through hole. The rotor assembly further includes a shaft, a rotating seat, and two bearings. The two bearings are respectively disposed at both ends within the second through hole. The shaft passes through the two bearings and extends out of the boss at one end. The rotating seat is fixedly connected to the end of the shaft extending out of the boss and is fixedly connected to a magnet. By forming the first through hole, the boss and the stator core are assembled, improving the stability of the fixed connection between the motor and the boss. The bearings are disposed within the second through hole, reducing friction during shaft rotation and lowering energy consumption, thus improving motor efficiency. The bearings also maintain stable shaft rotation, reducing vibration and noise. Since the rotating seat is fixedly connected to the magnet, and one end of the shaft is connected to the rotating seat, the rotation of the magnet can drive the rotating seat to rotate, thereby achieving the blowing function of accelerating airflow.

[0077] 6. In one embodiment of this utility model, the diameter of the first through hole is between 10mm and 12mm; the diameter of the second through hole is between 8.6mm and 10.6mm. Through the above-mentioned dimensional design, the boss can be fixedly connected to the motor, while also accommodating the normal rotation of the shaft and bearing, and ensuring sufficient mechanical strength.

[0078] 7. In one embodiment of this utility model, a receiving groove is provided on the side of the rotating seat near the boss. The boss extends into the receiving groove, and the stator assembly and magnet are located inside the receiving groove. The magnet is fixedly connected to the inner sidewall of the receiving groove, and one end of the rotating shaft extending out of the boss is fixedly connected to the inner bottom wall of the receiving groove. By providing the receiving groove, the receiving groove protects and accommodates the stator assembly and magnet, and reduces noise. The magnet is fixedly connected to the inner sidewall of the receiving groove, and one end of the rotating shaft extending out of the boss is fixedly connected to the inner bottom wall of the receiving groove, so that the rotating seat, magnet, and rotating shaft can achieve co-rotation with a high connection strength.

[0079] 8. In one embodiment of this utility model, the depth of the receiving groove is greater than or equal to the axial length of the magnet, and gaps are left between the magnetic guide and the groove opening and inner bottom wall of the receiving groove. The receiving groove also includes a connecting part, which protrudes towards the boss and has a connecting cavity corresponding to the rotating shaft. One end of the rotating shaft extending out of the boss is inserted into the connecting cavity. Since the depth of the receiving groove is greater than or equal to the axial length of the magnet, and the axial length of the magnet is greater than the total thickness of multiple stacked magnetic guides, the receiving groove has sufficient depth to accommodate the magnet and the magnetic guide. Gaps are left between the magnetic guide and the groove opening and inner bottom wall of the receiving groove. These gaps further limit the total thickness of the magnetic guide, reducing eddy current losses and improving magnetic flux utilization. The gaps also ensure a safe distance between the stator assembly and the rotating base, improving the safety of the portable fan operation. Since the connecting part protrudes towards the boss and has a connecting cavity corresponding to the rotating shaft, the protruding shape of the connecting part allows the connecting cavity to have a deeper depth, improving the connection strength of the rotating shaft inserted into the connecting cavity and achieving a tight connection between the rotating base and the rotating shaft.

[0080] 9. In one embodiment of this utility model, an elastic element is sleeved on the rotating shaft. One end of the elastic element abuts against the receiving groove, and the other end abuts against the bearing facing the receiving groove. The two ends of the elastic element abut against the rotating seat and the bearing respectively, and can rotate together with the rotating seat and the bearing. The elastic element can prevent the rotating seat from vibrating in the axial direction with its elastic force, which helps to reduce working noise and improve the user experience.

[0081] 10. In one embodiment of this utility model, the portable fan includes a main body and the aforementioned motor. A chamber is formed within the main body, and the motor is disposed within the chamber. The rotor assembly includes a rotating base, which can be a diagonal-flow fan, an axial-flow fan, or a centrifugal fan. The chamber provides housing space for the motor. The rotor assembly, including the rotating base, can accelerate airflow in the axial and / or radial directions. The portable fan with the aforementioned motor has the advantages of powerful performance and quiet operation.

[0082] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric motor, characterized in that: The motor includes a stator assembly and a rotor assembly arranged coaxially. The rotor assembly is rotatable relative to the stator assembly. The stator assembly includes a stator core and windings. The stator core is provided with multiple winding portions. The windings are wound on the winding portions. The winding portions include multiple stacked magnetic conductive elements. The rotor assembly includes a magnet arranged around the stator assembly. The axial length of the magnet is greater than the total thickness of the multiple stacked magnetic conductive elements.

2. The motor as described in claim 1, characterized in that: The magnetic conductor is a silicon steel sheet, and the axial length of the magnet is between 11 mm and 13 mm; the total thickness of the multiple stacked silicon steel sheets is between 7.5 mm and 9.5 mm.

3. The motor as described in claim 1, characterized in that: The magnetization of the magnet is between 1100 Gauss and 1300 Gauss; the outer diameter of the magnet is between 25.2 mm and 27.2 mm; and the inner diameter of the magnet is between 21.8 mm and 23.8 mm.

4. The motor as described in claim 1, characterized in that: The stator assembly has a diameter between 21 mm and 23 mm, and the distance between two opposite winding portions is between 12 mm and 14 mm; the wire diameter of the winding is between 0.45 mm and 0.47 mm; the number of winding portions is 6, 8 or 9.

5. The motor as described in claim 1, characterized in that: The motor also includes a boss. A first through hole is provided in the center of the stator core. The boss passes through the first through hole and is fixedly connected to the stator core. The boss has a second through hole. The rotor assembly also includes a rotating shaft, a rotating seat, and two bearings. The two bearings are respectively disposed at both ends in the second through hole. The rotating shaft passes through the two bearings and extends out of the boss at one end. The rotating seat is fixedly connected to the end of the rotating shaft that extends out of the boss. The rotating seat is fixedly connected to the magnet.

6. The motor as described in claim 5, characterized in that: The diameter of the first through hole is between 10 mm and 12 mm; the diameter of the second through hole is between 8.6 mm and 10.6 mm.

7. The motor as described in claim 5, characterized in that: The rotating seat has a receiving groove on the side near the boss, the boss extends into the receiving groove, the stator assembly and the magnet are located in the receiving groove, the magnet is fixedly connected to the inner side wall of the receiving groove, and one end of the rotating shaft extending out of the boss is fixedly connected to the inner bottom wall of the receiving groove.

8. The motor as described in claim 7, characterized in that: The depth of the receiving groove is greater than or equal to the axial length of the magnet, and there are gaps between the magnetic conductor and the groove opening and inner bottom wall of the receiving groove; the receiving groove also includes a connecting part, the connecting part protrudes towards the boss, the connecting part has a connecting cavity corresponding to the rotating shaft, and one end of the rotating shaft extending out of the boss is inserted into the connecting cavity.

9. The motor as described in claim 8, characterized in that: An elastic element is fitted onto the rotating shaft. One end of the elastic element abuts against the receiving groove, and the other end abuts against the bearing facing the receiving groove.

10. A portable fan, characterized in that: The portable fan includes a main body and a motor as described in any one of claims 1-9, wherein a cavity is formed in the main body and the motor is disposed in the cavity; the rotor assembly includes a rotating base, which is a mixed-flow fan, an axial-flow fan, or a centrifugal fan.

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