Stator, motor core assembly and motor

Abstract

The stator comprises a stator iron core, the stator iron core comprises a magnet yoke and a plurality of tooth portions arranged at intervals in the circumferential direction of the inner wall of the magnet yoke, each tooth portion comprises a tooth crown and a tooth root connecting the magnet yoke and the tooth crown, a tooth groove is formed between every two adjacent tooth portions, the axial height of the stator iron core is 7 mm-15 mm, the outer diameter of the magnet yoke is 25.5 mm-26.5 mm, the inner diameter of each tooth portion is 9 mm-10 mm, the radial length of each tooth portion is 5.8 mm-6.2 mm, and the outer diameter of each tooth portion is 25.5 mm-26.5 mm. The width of the tooth root is 2mm-2.3 mm, the opening width of the tooth groove is 2mm-2.4 mm, the inner wall of the magnet yoke is in arc transition connection with the tooth root, the radius R of the arc is 1mm-1.8 mm, the tooth crown comprises a connecting surface connected with the tooth root, and the included angle beta between the connecting surface and the symmetrical surface of the two adjacent tooth parts is 65-75 degrees. Through collaborative optimization design of key structure parameters of the stator and the rotor, the motor can effectively reduce the magnetic flux density and improve the magnetic flux utilization rate, and efficient electromagnetic energy conversion is realized in a compact casing space; the motor is low in weight, small in size, large in power, high in power density, low in noise, high in portability and high in practical value.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a stator, a motor core component and a motor. Background Art

[0002] The current motor market continues to see growing demand for high-power-density motors, with lightweight, miniaturization, and high power output becoming core competitive factors. However, traditional motor designs face multiple technical bottlenecks: Volume compression leads to excessively high magnetic flux density, which easily saturates the stator core and rotor, significantly reducing the motor's power output and efficiency. Furthermore, the motor's limited internal space significantly increases noise.

[0003] Therefore, in order to solve the above technical problems, it is necessary to provide a stator, a motor core component and a motor.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide a stator, a motor core component and a motor, which can enable the motor to output high power while reducing the weight and volume of the motor, and the motor has high power density and low noise.

[0006] In order to achieve the above object, a specific embodiment of the present invention provides the following technical solutions:

[0007] A stator comprises a stator core, the stator core comprising a magnetic yoke and a plurality of teeth spaced circumferentially along an inner wall of the yoke, the teeth comprising a tooth crown and a tooth root connecting the magnetic yoke and the tooth crown, a tooth slot being formed between two adjacent teeth, an axial height L of the stator core being 7 mm to 15 mm, an outer diameter D of the magnetic yoke being 25.5 mm to 26.5 mm, an inner diameter D2 of the tooth portion being 9 mm to 10 mm, a radial length H1 of the tooth portion being 5.8 mm to 6.2 mm, a tooth root width W being 2 mm to 2.3 mm, an opening width W1 of the tooth slot being 2 mm to 2.4 mm, an arc transition connecting the inner wall of the yoke and the tooth root, the arc radius R being 1 mm to 1.8 mm, the tooth crown comprising a connecting surface connected to the tooth root, an angle β between the connecting surface and a symmetry plane of two adjacent teeth being 65° to 75°.

[0008] Another specific embodiment of the present invention provides a technical solution as follows:

[0009] A motor core component, characterized in that the motor core component includes the stator and rotor as described above, the rotor is rotatably arranged inside the stator, the rotor includes a rotating shaft and a permanent magnet sleeved on the outside of the rotating shaft, the outer diameter d of the rotating shaft is 7.5mm~8.5mm, and the inner diameter d1 of the rotating shaft is 3mm~5mm.

[0010] In one or more embodiments of the present invention, six teeth are arranged at intervals along the circumferential direction of the inner wall of the yoke, and two first magnetic poles and two second magnetic poles are alternately formed in the permanent magnet along the circumferential direction, and the magnetic properties of the first magnetic pole and the second magnetic pole are arranged in opposite directions.

[0011] In one or more embodiments of the present invention, the permanent magnet is fixedly connected to the rotating shaft through a bonding process.

[0012] Another specific embodiment of the present invention provides a technical solution as follows:

[0013] A motor, characterized in that the motor comprises:

[0014] chassis;

[0015] The motor core assembly as mentioned above is fixedly installed inside the housing;

[0016] an output shaft rotatably mounted on the housing and fixedly mounted to the rotor in the motor core assembly, with an end of the output shaft extending out of the housing;

[0017] a stator impeller, fixedly mounted in the casing and arranged away from the stator;

[0018] An air guide cover is fixedly mounted on the stator impeller;

[0019] The impeller is fixedly mounted on the end of the output shaft and is accommodated in the air guide cover.

[0020] In one or more embodiments of the present invention, the weight of the motor is 90g-100g, and the maximum input power of the motor is 400w.

[0021] In one or more embodiments of the present invention, the housing is made of aluminum or aluminum alloy, and the stator in the motor core assembly is in contact with the inner wall of the housing; and / or,

[0022] The impeller is integrally formed; and / or,

[0023] The impeller is made of 6 series aluminum alloy or 7 series aluminum alloy.

[0024] In one or more embodiments of the present invention, the outer diameter D of the housing m The height H of the motor along the length direction of the output shaft is 35mm~37mm.m The distance H between the air inlet end face and the air outlet end face of the casing is 55mm~60mm. i The inner diameter D of the end of the housing used to fix the stator is 36.5mm~37.5mm. i The outlet area A of the impeller is 27mm~28mm. out and the impeller inlet area A in The proportional coefficient E is 0.8~1.8.

[0025] In one or more embodiments of the present invention, the impeller comprises:

[0026] wheel hub;

[0027] The first blades and the second blades are alternately arranged in a circumferential direction of the hub. The lengths of the first blades and the second blades are different. The slip coefficient I of the impeller is 0.9-0.95. The total number of the first blades and the second blades is 8-12.

[0028] In one or more embodiments of the present invention, the outer diameter of the stator is 35 mm to 37 mm, the height of the motor along the length of the output shaft is 55 mm to 60 mm, and the inner diameter of the end of the casing for fixing the stator is 27 mm to 28 mm.

[0029] Compared with the existing technology, the stator, motor core components and motor of the present invention, through the coordinated optimization design of the key structural parameters of the stator and rotor, the motor can effectively reduce the magnetic flux density and improve the magnetic flux utilization rate, and realize efficient electromagnetic energy conversion in a compact casing space; the motor has low weight, small size, high power, high power density, low noise, high portability, and high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 Schematic diagram of the cross-sectional structure of a motor in one embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the flow path of a motor in one embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the main structure of a motor in one embodiment of the present invention;

[0034] Figure 4 Schematic diagram of the three-dimensional structure of the motor core component in one embodiment of the present invention;

[0035] Figure 5 Schematic diagram of the top view of the stator in one embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the main structure of a stator in one embodiment of the present invention;

[0037] Figure 7 for Figure 5 A magnified view of the local structure at point A;

[0038] Figure 8 This is a schematic diagram of the three-dimensional structure of a rotating shaft in one embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of the main structure of the rotating shaft in one embodiment of the present invention;

[0040] Figures 10a-10f Schematic diagram of simulation of stator core loss in one embodiment of the present invention;

[0041] Figure 11 Schematic diagram of the three-dimensional structure of the impeller in one embodiment of the present invention;

[0042] Figure 12 This is a schematic diagram of the main structure of the impeller in one embodiment of the present invention;

[0043] Figure 13 Schematic diagram of the top view of the impeller in one embodiment of the present invention;

[0044] Figures 14a-14c FIG. 1 is a schematic diagram of a simulation of the aerodynamic efficiency of the impeller in one embodiment of the present invention.

[0045] Description of main reference numerals:

[0046] 1 stator

[0047] 11 stator core

[0048] 111 yoke

[0049] 112 teeth

[0050] 1121 tooth root

[0051] 1122 Crown

[0052] 11221 connection surface

[0053] 113 tooth groove

[0054] 114 Symmetry plane

[0055] 2 rotors

[0056] 21 Shaft

[0057] 3. Chassis

[0058] 4 Output shaft

[0059] 5. Stator impeller

[0060] 6 Air guide cover

[0061] 7 Impeller

[0062] 71 wheels

[0063] 72 first blade

[0064] 73 Second blade. DETAILED DESCRIPTION

[0065] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present disclosure.

[0066] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0067] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0068] The technical solution of the present invention will be described below with reference to the accompanying drawings.

[0069] Existing motors used in small household appliances like vacuum cleaners typically have diameters of 45mm or 55mm. Motor size is primarily determined by the dimensions of its internal stator core, which plays a dominant role. Generally speaking, the higher the motor's output power, the larger its overall volume and size. This physical law makes it difficult for existing technical solutions to overcome the fundamental contradiction between miniaturization and high performance, creating a core bottleneck in improving product performance and portability.

[0070] Reference Figure 1 、 Figure 2As shown, the motor in one embodiment of the present invention includes a housing 3, a motor core assembly, an output shaft 4, a stator 5, an air scoop 6, and a moving impeller 7. The motor core assembly is fixedly mounted inside the housing 3; the output shaft 4 is rotatably mounted on the housing 3 and fixedly mounted to the rotor 2 in the motor core assembly, with the end of the output shaft 4 extending out of the housing 3; the stator 5 is fixedly mounted in the housing 3 and disposed away from the stator 1; the air scoop 6 is fixedly mounted on the stator 5; and the moving impeller 7 is fixedly mounted on the end of the output shaft 4 and housed inside the air scoop 6.

[0071] Specifically, refer to Figure 4 、 Figure 5 As shown, the core assembly of the motor includes a stator 1 and a rotor 2, with the rotor 2 rotatably disposed within the stator 1. The stator 1 includes a stator core 11, which includes a yoke 111 and a plurality of teeth 112 spaced circumferentially along the inner wall of the yoke 111. The teeth 112 include crowns 1122 and tooth roots 1121 connecting the yoke 111 and the crowns 1122. Tooth slots 113 are formed between two adjacent teeth 112.

[0072] It should be explained that the stator core 11 is formed by stacking thin silicon steel sheets. This structure can effectively suppress eddy currents and reduce eddy current losses. Its core function is to provide a magnetic resistance path to guide the magnetic flux. The magnetic flux mainly passes through the core along an axial path perpendicular to the plane of the silicon steel sheet. Therefore, the cross-sectional area of ​​the stator core 11 directly determines the magnetic flux passing through the unit area (i.e., the magnetic flux density). Ferromagnetic materials such as silicon steel sheets have magnetic saturation. When the magnetic flux density B exceeds the saturation point of the material, the magnetic permeability of the material drops sharply and the magnetic resistance increases sharply. Therefore, referring to Figures 5 to 7 As shown, the axial height L of the stator core 11 in this embodiment is 7mm~15mm, and the outer diameter D of the yoke 111 is 25.5mm~26.5mm. By setting a reasonable axial height of the stator core 11 and the outer diameter of the yoke 111, the power density can be maximized in a compact space: by optimizing the axial height of the stator core 11, the cross-sectional area of ​​the magnetic circuit is expanded in a small space, the working magnetic flux density is significantly reduced, and the core saturation is avoided; at the same time, the outer diameter of the yoke 111 is optimized, and under the premise of minimizing the radial size, the actual working magnetic flux density of the yoke 111 is significantly lower than the saturation magnetic density of the stator core 11 material, thereby reserving sufficient anti-saturation buffer space. The two work together to enable the motor to output higher power under limited volume conditions and improve efficiency due to reduced core loss.

[0073] It should be noted that:

[0074] Magnetic flux density refers to the amount of magnetic flux passing through a unit area, and the magnetic flux density is positively correlated with the cross-sectional area of ​​the stator core 11. Specifically, the effective cross-sectional area of ​​the stator core 11 includes the effective cross-sectional area of ​​the tooth portion 112 and the effective cross-sectional area of ​​the yoke 111. When the width of the tooth root 1121 and the radial thickness of the yoke 111 are determined at the set values, increasing the axial height L of the stator core 11 can linearly increase the effective cross-sectional area A1 of the tooth portion 112 and the effective cross-sectional area A2 of the yoke 111; at the same time, due to the increase in the axial height L of the stator core 11, the effective cross-sectional area A1 of the tooth portion 112 and the effective cross-sectional area A2 of the yoke 111 are directly increased. If the same magnetic flux density is used, the effective cross-sectional area A1 of the tooth portion 112 and the effective cross-sectional area A2 of the yoke 111 are directly increased. Under this condition, the same magnetic flux can be Dispersed to a larger cross section. Ultimately, the working magnetic flux density B can be reduced. Due to the saturation magnetic flux density B of the silicon steel sheet 饱 ≈1.8T, therefore, increasing the axial height L of the stator core 11 can make the magnetic flux density B of the stator core 11 < B 饱 , saturation can be avoided.

[0075] When a high-power motor needs to output a greater torque, the magnetic flux φ needs to be increased. If the axial height L of the stator core 11 is kept unchanged and the magnetic flux φ is increased, the magnetic flux density B of the stator core 11 will eventually be greater than the saturation magnetic flux density of the silicon steel sheet, eventually leading to saturation. Therefore, when the axial height L of the stator core 11 is increased, the magnetic flux density B of the stator core 11 will be less than the saturation magnetic flux density B of the silicon steel sheet. 饱 After this, the effective cross-sectional area A is increased, which increases the magnetic flux φ. The magnetic field affects the torque through the magnetic flux φ. Increasing the magnetic field means increasing the magnetic flux φ. While keeping the current I constant, the torque T increases, thereby increasing the motor's output torque.

[0076] When the outer diameter D of the yoke 111 is increased and the inner diameter of the yoke 111 remains unchanged, the radial thickness of the yoke 111 increases, which can further increase the effective cross-sectional area of ​​the yoke 111, thereby reducing the working magnetic flux density of the yoke 111 and releasing the magnetic flux capacity at the yoke 111.

[0077] However, it should be noted that the core loss is proportional to the core volume. If the axial height L of the stator core 11 and the outer diameter D of the yoke 111 are endlessly increased, the volume and weight of the motor core components will increase, material costs will be wasted, costs will increase, core loss will increase significantly, and efficiency will decrease. In addition, if the axial height L is too large, the heat dissipation path in the central area of ​​the stator core 11 will be extended, heat dissipation will be difficult, and the axial temperature difference of the stator core 11 will become larger; at the same time, if the ratio of the axial height L of the stator core 11 to the outer diameter D of the yoke 111 is too large, a slender stator core 11 will be formed, the stiffness of the stator 1 will decrease, and it will easily resonate with the electromagnetic force wave, ultimately resulting in excessive motor noise.

[0078] In addition, since the power density of the motor is negatively correlated with the outer diameter D of the yoke 111 , when the outer diameter D of the yoke 111 is too large, the power density will be reduced.

[0079] Reference Figures 5 to 7 As shown, the inner diameter D2 of the tooth portion 112 in this embodiment (i.e., the inner diameter of the curved surface on which the inner wall of the tooth portion 112 lies) is 9 mm to 10 mm, which directly determines the length of the air gap between the stator 1 and the rotor 2. In this embodiment, the radial length H1 of the tooth portion 112 (i.e., the radial distance between the curved surface on which the inner wall of the yoke 111 lies and the curved surface on which the inner wall of the crown 1122 lies) is 5.8 mm to 6.2 mm, and the width W of the tooth root 1121 is 2 mm to 2.3 mm. By optimizing the width W of the tooth root 1121, while providing sufficient mechanical strength for the stator core 11, the effective cross-sectional area A1 of the magnetic circuit of the tooth portion 112 is directly determined. This ensures that the operating magnetic flux density of the tooth portion 112 is lower than the saturation magnetic flux density of the stator core 11, preventing magnetic saturation, increasing core losses, decreasing efficiency, and reducing heat generation.

[0080] In this embodiment, the slot 113 opening width W1 (i.e., the spacing between two adjacent tooth crowns 1122) is 2 mm to 2.4 mm. The slot 113 opening width W1 is a core parameter in motor design, and its value directly affects the air gap permeance distribution and electromagnetic performance. The air gap refers to the space between the stator 1 and rotor 2 of a motor. This space is typically filled with air or other non-magnetic materials (such as plastic or epoxy resin), hence the name "air gap." The air gap width is typically small, but it significantly impacts motor performance. If the air gap is too wide, the magnetic field weakens, increasing energy loss; if the air gap is too narrow, it may induce mechanical vibration or noise. By designing an appropriate slot 113 opening width, noise and vibration can be reduced. Furthermore, optimizing the air gap permeance distribution can reduce the harmonic amplitude of the air gap permeance. Since slot 113 torque and torque pulse are positively correlated with the harmonic amplitude of the air gap permeance, reducing the harmonic amplitude of the air gap permeance can also reduce slot 113 torque and torque pulse. Furthermore, the appropriate opening width of the tooth slot 113 can facilitate automatic winding to optimize the maximum slot fill rate.

[0081] In this embodiment, the inner wall of the yoke 111 and the tooth root 1121 are connected by an arc transition, and the arc radius R is 1 mm to 1.8 mm. The smooth transition can reduce stress concentration at this location, stabilize the magnetic flux density in this area, and avoid local magnetic saturation.

[0082] Reference Figure 5 As shown, the tooth crown 1122 in this embodiment includes a connecting surface 11221 connected to the tooth root 1121. The angle β between the connecting surface 11221 and the symmetry plane 114 of two adjacent tooth portions 112 is 65° to 75°. This can smooth the change in air gap permeability, weaken the torque and torque pulse of the tooth slot 113, thereby reducing noise and vibration, and avoiding local magnetic saturation. If the air gap width is uneven, it will lead to uneven magnetic field distribution and even magnetic field distortion. If the air gap width is uniform and appropriate, it can reduce magnetic field distortion and make the magnetic field distribution more uniform. If the angle β is designed too small, it is easy to reduce the effective cross-sectional area at the tooth crown 1122, thereby reducing the effective cross-sectional area of ​​A1, resulting in increased core loss and easy local magnetic saturation. If the angle β is designed too large, when the magnetic pole of rotor 2 passes near the tooth crown 1122, the rate of change of the air gap permeability is large, the generated harmonics are still significant, the torque and torque pulsation of the tooth slot 113 are large, and the electromagnetic noise and vibration levels are high.

[0083] Reference Figure 8 、 Figure 9As shown, the rotor 2 in this embodiment includes a rotating shaft 21 and a permanent magnet sleeved on the outside of the rotating shaft 21. Since the inner diameter D2 of the tooth portion 112 is 9mm~10mm, when the outer diameter d of the rotating shaft 21 is 7.5mm~8.5mm and the inner diameter d1 of the rotating shaft 21 is 3mm~5mm, it can directly affect the size of the air gap between the stator core 11 and the rotating shaft 21. Among them, the axial height L of the rotating shaft 21 is roughly the same as the axial height L of the stator core 11. The appropriate air gap size helps to optimize the magnetic field distribution and reduce the torque pulse and tooth slot 113 torque caused by the tooth slot 113 effect. At the same time, for the hollow rotor 2, the appropriate inner diameter design of the rotor 2 can not only safely transmit torque, but also increase the structural strength of the rotor 2.

[0084] In summary, under the premise of limiting the outer diameter of the yoke 111 and the axial height of the stator core 11, the maximum slot fill rate design under the limit of the automatic winding process is adopted to improve the utilization rate of the tooth slot 113, while improving the utilization rate of the material and reducing copper loss; the core component of the motor optimizes the magnetic circuit design, which can make the magnetic circuit transition smooth, shorten the magnetic circuit path, reduce leakage magnetic flux, and thus improve the utilization rate of the magnetic field. The motor has achieved extremely high levels of motor power and efficiency while reducing its volume. Combined with the optimization of the air gap magnetic field waveform, it can be verified through numerical simulation that, as shown in Table 1, a stable electromagnetic efficiency of 92% to 95% can be obtained under rated conditions and the core loss is reduced (refer to Figure 10a to Figure 10f shown).

[0085] Table 2 Stator core simulation test data table

[0086]

[0087] By utilizing the aforementioned core motor components and through the coordinated optimization of key structural parameters of the stator 1 and rotor 2, the motor of this embodiment effectively reduces magnetic flux density and improves magnetic flux utilization, achieving efficient electromagnetic energy conversion within the compact space of the housing 3. The motor of this embodiment is lightweight, compact, yet powerful, with high power density, low noise, and high portability, thus offering high practical value.

[0088] At the same time, it should be noted that, referring to Figure 2 As shown, since the stator 1 is arranged away from the stator impeller 5 and the movable impeller 7, when the motor is in working state, the movable impeller 7 rotates to form an airflow flowing from the automatic impeller 7 to the stator impeller 5. When the airflow flows through the casing 3 near the stator 1, it can indirectly cool the stator 1 by taking away the heat of the casing 3, thereby preventing the stator 1 from heating up too quickly.

[0089] The stator and rotor in the existing motor adopt a design of three teeth and two magnetic poles. In this case, the motor has only three teeth in the stator, the tooth width is limited, and the magnetic flux passing capacity is weak. Even if the current is increased, it is easy to cause the stator core to be magnetically saturated, resulting in the inability to increase the power. The input power of the motor is relatively small. In order to increase the input power to meet the equipment usage requirements, it is usually necessary to increase the stator outer diameter or the stator height. Although this method can expand the cross-sectional area of ​​the magnetic circuit to allow higher magnetic flux or increase the number of winding turns to enhance the electromagnetic force, it also increases the weight and volume of the motor, thereby reducing the power density of the motor and making the existing motor unable to meet the actual needs of small size and lightweight; at the same time, because the winding end is too long, leakage magnetic field will occur at the end, reducing the efficiency of the motor; in addition, the magnetic field uniformity of the two magnetic poles is poor, and the air gap magnetic field utilization rate is low. The power output of the motor with the same volume and the design of three teeth and two magnetic poles is small. In order to solve the above problems, refer to Figure 4 As shown, in this embodiment, six teeth 112 are spaced circumferentially along the inner wall of the yoke 111. Two first magnetic poles and two second magnetic poles are alternately formed in the permanent magnet along the circumference of the permanent magnet, with the first and second poles having opposite magnetic properties. Since 6 is a multiple of 3, setting six teeth 112 naturally adapts to three-phase AC power. Each phase occupies two tooth slots 113, ensuring uniform spatial distribution of the three-phase windings (U, V, W) (i.e., each phase is spaced 120° apart), creating a symmetrical magnetic field and avoiding unbalanced magnetic pull. Furthermore, since 4 is an even number, the magnetic fields formed by the first and second poles are symmetrically distributed (NSNS). When the stator 1 and rotor 2 are mated, a stable rotating magnetic field is formed, with a stacked magnetic flux path and uniform core losses, thereby increasing power output for a given volume. Furthermore, this motor core component features a simple and reliable structure, low cost, and high practical value. The stator core 11, with its six teeth 112 and four magnetic poles, achieves a tighter winding arrangement, reducing magnetic flux leakage and copper loss at the ends of the stator 1, thereby improving electromagnetic conversion efficiency. Compared to a two-pole design, the four-pole design produces a denser and more uniform magnetic field distribution, enhancing the utilization of the air gap magnetic field. This allows the motor to generate greater electromagnetic force per unit volume, thereby outputting greater power.

[0090] Preferably, the permanent magnets in this embodiment are fixedly connected to the rotating shaft by a bonding process. Compared with the sintering solution, the bonding solution adopted in this embodiment is lighter, more adaptable, and less expensive, and has practical value.

[0091] The motor in this embodiment weighs 90g to 100g. Numerical simulations show that, as shown in Table 2, the motor's maximum input power can reach approximately 400W, and its power density can be greater than or equal to 4. High power density means greater power output per unit volume or mass. This characteristic enables the motor in this embodiment to overcome spatial limitations, achieving high output within limited structural spaces, avoiding structural redundancy, and improving portability.

[0092] Table 2 Motor simulation test data

[0093]

[0094] To address the issue of stator 1 heating up and thus facilitate heat dissipation within the motor's core components, the housing 3 in this embodiment is made of aluminum or an aluminum alloy. This not only improves the heat conduction rate of the housing 3 but also reduces its weight, lowering production costs and improving corrosion resistance. The stator 1 in the motor's core components fits snugly against the inner wall of the housing 3. When the outer wall of the stator 1 fits snugly against the inner wall of the housing 3, heat within the motor's core components is effectively transferred outward.

[0095] The motor in this embodiment is small in size, which limits the size of the impeller 7. In order to achieve a maximum input power of 400W, the speed of the smaller impeller 7 increases sharply. The maximum speed of the impeller 7 needs to reach more than 160,000 rpm. The traditional riveted impeller 7 cannot meet the high strength requirements. Therefore, in order to ensure that the impeller 7 in a small-sized motor can meet the corresponding strength requirements under the premise of high-speed rotation, the impeller 7 in this embodiment is integrally formed and made of 6-series aluminum alloy or 7-series aluminum alloy. Based on this design, the risk of impeller 7 exploding due to high speed, high temperature, and excessive centrifugal force generated by the impeller 7 under extreme working conditions is resolved.

[0096] In order to make the strength of the impeller 7 meet the requirements, refer to Figures 11 to 13 As shown, the design parameters of the impeller 7 need to meet the following requirements:

[0097] Since the overall size of the motor is relatively small, the maximum diameter D3 of the impeller 7 in this embodiment is 27 mm to 29 mm.

[0098] According to the centrifugal stress formula (Formula 1);

[0099] Among them, the material density =2700kg / m 3 , angular velocity (n is the rotation speed), the radius from the blade center of mass to the rotation axis is R=D3 / 2=0.0145, =240Mpa (the allowable stress of 6 series aluminum is approximately 240Mpa, and the allowable stress of 7 series aluminum is approximately 300Mpa)

[0100] After substituting the above values ​​into formula 1, the centrifugal stress can be calculated =178.6Mpa≤240Mpa. Therefore, the strength requirement is met within this range.

[0101] In order to increase the aerodynamic efficiency generated by the impeller 7 when it works, the outlet area A of the impeller 7 in this embodiment is out and the inlet area A of the impeller 7 in The proportional coefficient E is between 0.8 and 1.8. When this proportional coefficient E is within this range, the flow channel in the impeller 7 expands moderately, allowing the fluid to flow smoothly from the impeller 7 inlet to the impeller 7 outlet at an accelerated or decelerated rate, minimizing gas flow losses. At this point, the impeller 7 effectively converts mechanical energy into fluid energy, resulting in high aerodynamic efficiency.

[0102] Since the inlet diameter D4 of the impeller 7 in this embodiment is 14mm-16mm, and the outlet height h2 of the impeller 7 is 2mm-3mm, the inlet area of ​​the impeller 7 in this embodiment is: (Formula 2), impeller 7 outlet area: A out = D3h2 (Formula 3). When the range of the impeller 7 inlet diameter D4 and the impeller 7 outlet height h2 is substituted into Formula 2 and Formula 3, A can be obtained. in =153.9~201.1mm 2 , A out= 169.6~273.5mm 2 , that is, E min =169.6 / 201.1≈0.84, E max =273.5 / 153.9≈1.78, the E min and E max and are both within the range of the proportionality coefficient E.

[0103] In this embodiment, the height H2 of the impeller 7 is 10 mm to 12 mm. The height of the impeller 7 affects the total length of the impeller 7 flow channel. The rotation of the impeller 7 drives the gas to perform work, which is a process of converting kinetic energy into static energy. Within a certain range, the longer the impeller 7 flow channel, the higher the energy conversion efficiency.

[0104] The impeller 7 in this embodiment includes a hub 71, a first blade 72, and a second blade 73. The first blade 72 and the second blade 73 are alternately arranged in the circumferential direction of the hub 71. The lengths of the first blade 72 and the second blade 73 are different. According to this design, a mixed flow splitter blade can be formed. Among them, the slip coefficient I of the impeller 7 is 0.9~0.95, and the total number of the first blade 72 and the second blade 73 is 8~12. It should be noted that the slip coefficient I is one of the main factors affecting the gas flow efficiency. According to the formula, I= (Formula 4), where K is an empirical constant related to the surface finish of the blades. In this embodiment, the empirical coefficient K is 0.7; Z = number of blades; represents the actual tangential velocity of the gas, U2 represents the theoretical value of the tangential velocity, and 2 represents the angle between the geometric tangent direction of the outer edge of the impeller blade and the direction opposite to the rotation of the impeller 7. The slip coefficient is directly related to the number of blades Z. When the total number of first blades 72 and second blades 73 is substituted into the slip coefficient calculation formula, the slip coefficients I are 0.908, 0.926, and 0.938, respectively, falling within the scope of protection of this application.

[0105] After the impeller 7 is designed according to the above requirements, the data in Table 3 are obtained through numerical simulation. These three sets of experimental data can prove that the aerodynamic efficiency of the impeller 7 in this embodiment is relatively balanced and stable, meeting the design requirements (refer to Figure 14a to Figure 14c shown).

[0106] Table 3 Dynamic impeller simulation test data

[0107]

[0108] Reference Figure 3 As shown, the outer diameter D of the housing 3 in this embodiment is m The motor height along the length of the output shaft 4 is 35mm~37mm. m The distance H between the air inlet end face and the air outlet end face of the housing 3 is 55mm~60mm. i The inner diameter D of the end of the housing 3 for fixing the stator 1 is 36.5mm~37.5mm. i The housing 3 designed in this way has a high mechanical structure strength and is compatible with the motor.

[0109] It should be noted that the structures and working principles of the stator 5, wind guide cover 6, etc. that are not elaborated in detail in this application can adopt existing solutions in the prior art, which can be understood and accepted by those skilled in the art. Since they are not the focus of protection of this application, they will not be elaborated on.

[0110] In the description of the embodiments of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the application is conventionally placed when in use, or are the orientation or position relationship conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0111] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0112] In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. used herein do not specifically refer to order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0113] It will be apparent to those skilled in the art that the present disclosure is not limited to the details of the exemplary embodiments described above and that the present disclosure can be implemented in other specific forms without departing from the spirit or essential characteristics of the present disclosure. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present disclosure is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0114] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A stator, characterized in that: The stator includes a stator core, which includes a yoke and a plurality of teeth spaced circumferentially along the inner wall of the yoke. The teeth include a tooth crown and a tooth root connecting the yoke and the tooth crown. A tooth slot is formed between two adjacent teeth. The axial height L of the stator core is 7 mm to 15 mm, the outer diameter D of the yoke is 25.5 mm to 26.5 mm, the inner diameter D2 of the tooth portion is 9 mm to 10 mm, the radial length H1 of the tooth portion is 5.8 mm to 6.2 mm, the tooth root width W is 2 mm to 2.3 mm, the opening width W1 of the tooth slot is 2 mm to 2.4 mm, the inner wall of the yoke and the tooth root are connected by an arc transition, the arc radius R is 1 mm to 1.8 mm, the tooth crown includes a connecting surface connected to the tooth root, and the angle β between the connecting surface and the symmetry plane of two adjacent teeth is 65° to 75°.

2. A motor core component, characterized in that: The core component of the motor includes the stator and rotor as described in claim 1, the rotor is rotatably arranged inside the stator, the rotor includes a rotating shaft and a permanent magnet sleeved on the outside of the rotating shaft, the outer diameter d of the rotating shaft is 7.5mm~8.5mm, and the inner diameter d1 of the rotating shaft is 3mm~5mm.

3. The motor core assembly according to claim 2, characterized in that: Six teeth are arranged at intervals along the circumferential direction of the inner wall of the magnetic yoke. Two first magnetic poles and two second magnetic poles are alternately formed in the permanent magnet along the circumferential direction. The magnetic properties of the first magnetic pole and the second magnetic pole are opposite.

4. The motor core assembly according to claim 2, characterized in that: The permanent magnet is fixedly connected to the rotating shaft through a bonding process.

5. A motor, characterized in that: The motor comprises: chassis; The motor core assembly according to claims 2 to 4 is fixedly installed inside the housing; an output shaft rotatably mounted on the housing and fixedly mounted to the rotor in the motor core assembly, with an end of the output shaft extending out of the housing; a stator impeller, fixedly mounted in the casing and arranged away from the stator; An air guide cover is fixedly mounted on the stator impeller; The impeller is fixedly mounted on the end of the output shaft and is accommodated in the air guide cover.

6. The motor according to claim 5, characterized in that The weight of the motor is 90g~100g, and the maximum input power of the motor is 400w.

7. The motor according to claim 5, characterized in that The housing is made of aluminum or aluminum alloy, and the stator in the motor core assembly is in contact with the inner wall of the housing; and / or, The impeller is integrally formed; and / or, The impeller is made of 6 series aluminum alloy or 7 series aluminum alloy.

8. The motor according to claim 5, characterized in that The maximum diameter D3 of the impeller is 27mm~29mm, the inlet diameter D4 of the impeller is 14mm~16mm, the outlet height h2 of the impeller is 2mm~3mm, the height H2 of the impeller is 10mm~12mm, and the outlet area A of the impeller is 2mm~3mm. out and the impeller inlet area A in The proportional coefficient E is 0.8~1.

8.

9. The motor according to claim 5, characterized in that The impeller comprises: wheel hub; The first blades and the second blades are alternately arranged in the circumferential direction of the hub. The lengths of the first blades and the second blades are different. The total number of the first blades and the second blades is 8 to 12. The slip coefficient I of the impeller is 0.9 to 0.

95.

10. The motor according to claim 5, characterized in that The outer diameter D of the housing m The height H of the motor along the length direction of the output shaft is 35mm~37mm. m The distance H between the air inlet end face and the air outlet end face of the casing is 55mm~60mm. i The inner diameter D of the end of the housing used to fix the stator is 36.5mm~37.5mm. i It is 27mm~28mm.

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