Stator core, stator and motor

Abstract

The stator iron core comprises a yoke part, tooth parts and shoe parts, the yoke part is annular, the tooth parts are arranged in an annular area of the yoke part, the tooth parts are arranged at intervals along the circumferential direction of the yoke part, one end of each tooth part in the tooth height direction is connected with the yoke part, and the other end of each tooth part in the tooth height direction is connected with the shoe parts. The other ends of the tooth parts in the tooth height direction are connected with the shoe parts, a tooth groove is formed between every two adjacent tooth parts, and a notch of the tooth groove is formed between every two adjacent shoe parts; wherein the stator iron core is provided with twelve tooth grooves, and the ratio of the width of each groove opening to the inner diameter of the stator iron core is 0.05-0.15. Therefore, the efficiency of the motor can be improved and the performance of the motor can be improved from two directions of improving the main magnetic flux and reducing the magnetic resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core, a stator and a motor. Background Art

[0002] The inner rotor type motor in the related art includes a stator and a rotor, wherein the rotor is rotatably disposed in the stator. For a stator core with twelve slots, the efficiency of the motor is reduced and needs to be improved. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a stator core, which has less magnetic leakage and smaller magnetic resistance, and can improve the efficiency of the motor.

[0004] The present application further proposes a stator using the above-mentioned stator core.

[0005] The present application also proposes a motor using the above-mentioned stator.

[0006] The stator core according to the first aspect of the present application includes: a yoke, a tooth portion and a shoe portion, the yoke is annular, the tooth portion is arranged in the inner ring area of ​​the yoke, the tooth portion is multiple and is arranged at intervals along the circumference of the yoke, one end of the tooth portion in the tooth height direction is connected to the yoke, and the other end of the tooth portion in the tooth height direction is connected to the shoe portion, a tooth slot is formed between two adjacent tooth portions, and a slot opening of the tooth slot is formed between two adjacent shoe portions; wherein the stator core has twelve tooth slots, and the ratio of the width of the slot opening to the inner diameter of the stator core is 0.05-0.15.

[0007] According to the stator core of the embodiment of the present application, by making the opening size of the slot more reasonable, it is possible to avoid the slot opening size being too large, so as to avoid excessive magnetic resistance on the flow path between the stator and the rotor. It is also possible to avoid the slot opening size being too small, so as to reduce the leakage magnetic flux of the stator core, thereby reducing the leakage magnetic flux and increasing the main magnetic flux, so as to improve the motor efficiency and improve the motor performance from two directions of increasing the main magnetic flux and reducing the magnetic resistance.

[0008] According to some embodiments of the present application, the ratio of the width of the slot to the inner diameter of the stator core is 0.122-0.127.

[0009] According to some embodiments of the present application, the inner diameter of the stator core is 55 mm to 57 mm, and the width of the slot is 3 mm to 8 mm.

[0010] In some embodiments, the yoke comprises a connecting section between two adjacent teeth, and a ratio of a width of the connecting section to a width of the teeth is 0.45 to 1.0.

[0011] Furthermore, the yoke comprises a connecting section located between two adjacent teeth, and a ratio of a width of the connecting section to a width of the teeth is 0.455-0.465.

[0012] Furthermore, the width of the connecting section is 3 mm to 5 mm, and the width of the tooth portion is 4 mm to 6.7 mm.

[0013] According to some embodiments of the present application, the yoke includes a connecting section located between two adjacent teeth, the width of the connecting section gradually decreases from the teeth on both sides to the center, and the minimum width of the central area of ​​the connecting section is the width of the connecting section.

[0014] In some embodiments, the angle of the boot is 113° to 155°, and the edge width of the boot is 0.5 mm to 0.7 mm.

[0015] According to some embodiments of the present application, the specifications of each tooth slot are consistent, the outer diameter of the stator core is 87mm~90mm, the inner diameter of the stator core is 55mm~57mm, the width of the tooth portion is 4mm~6.7mm, the width of the slot is 6mm-7mm, the yoke includes a connecting section located between two adjacent teeth, the width of the connecting section is 3mm-5mm, the angle of the boot is 113°~155°, and the edge width of the boot is 0.5mm~0.7mm.

[0016] The stator according to the embodiment of the second aspect of the present application includes the stator core described in the above embodiment.

[0017] The motor according to the third aspect of the present application comprises a rotor and the stator described in the above embodiment, and the rotor is rotatably disposed in the stator.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a stator core in the related art;

[0020] Figure 2 Shows Figure 1 Schematic diagram of the magnetic field lines distribution of the stator core;

[0021] Figure 3 yes Figure 2 A partial enlarged view of

[0022] Figure 4is a schematic diagram of a motor according to an embodiment of the present application;

[0023] Figure 5 yes Figure 4 Schematic diagram of the stator core in FIG.

[0024] Figure 6 Shows Figure 4 Schematic diagram of the magnetic field lines distribution of the stator core;

[0025] Figure 7 yes Figure 6 A partial enlarged view of

[0026] Figure 8 It is a motor efficiency map of the motor according to an embodiment of the present application.

[0027] Reference numerals:

[0028] This application:

[0029] Motor 100,

[0030] stator core 10, yoke 11, connecting section 111, tooth 12, shoe 13,

[0031] Rotor core 20, permanent magnet 30,

[0032] Tooth a, notch b,

[0033] stator core inner diameter D1, stator core outer diameter D2, slot width W1, connection section width W2, shoe edge width W3, tooth width W4, shoe angle α,

[0034] Existing technology:

[0035] Stator core 10', yoke 11', connecting section 111', tooth 12', shoe 13'. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0038] First, if Figure 1 , Figure 2 and Figure 3 As shown, in the related art, Figure 1 The stator core 10' shown is a traditional core structure with a small notch b. A tooth 12' is provided inside the yoke 11'. The shoe 13' at the other end of the tooth 12' is too large and the notch between adjacent shoes 13' is too small, resulting in a decrease in the motor efficiency of the motor.

[0039] Specifically, the size of the motor boots 13 ′ is too large, and the size of the slots between adjacent boots 13 ′ is too small, resulting in large magnetic leakage, low magnetic flux utilization of the permanent magnets of the motor, and low motor efficiency of the motor.

[0040] See also Figure 2 and Figure 3 As shown, the number of leakage magnetic flux lines in the region Z1 of the stator core 10' of the prior art is 11, and the number of leakage magnetic flux lines in the region Z2 is 4. Figure 6 and Figure 7 As shown, the stator core 10 of the embodiment of the present application increases the slot size between adjacent boots so that the number of leakage magnetic lines of force in area Z3 is 9 and the number of leakage magnetic lines of force in area Z4 is 3, which can effectively reduce leakage magnetic flux, improve magnetic flux utilization, and thus improve motor efficiency.

[0041] Among them, area Z1 and area Z2 are the magnetic line distributions in two areas of the motor of the related technology at different working times, while area Z3 and area Z4 are the magnetic line distributions in two areas of the motor of the embodiment of the present application at different working times.

[0042] That is to say, based on the technical problems of the existing stator core 10 ′, the present application proposes a new stator core 10 that can improve magnetic leakage to improve motor efficiency.

[0043] In the embodiments of the present application, Figure 4The motor 100 is a device for converting electric energy into mechanical energy. The stator, rotor and air gap constitute the magnetic circuit of the motor 100. The stator core 10 has a plurality of stator punchings stacked together. The stator core 10 can support and fix the stator winding. The rotor core 20 can support and fix the permanent magnet 30. The permanent magnet 30 rotates relative to the stator under the action of electromagnetic force to convert electric energy into mechanical energy, that is, the current passing through the stator winding can generate a magnetic field. The magnetic field and the permanent magnet 30 on the rotating rotor generate a magnetic force and further promote the rotation of the rotor to convert electric energy into mechanical energy through the rotor. The air gap is an air gap between the stator and the rotor, and is also a part of the magnetic circuit. It is the flow path of the magnetic circuit in the motor 100, which can ensure that there is no interference between the stator and the rotor.

[0044] Below, refer to Figure 4-Figure 8 , the stator core 10, the stator and the motor 100 of the embodiment of the present application are explained and illustrated in detail.

[0045] like Figure 4 As shown, the stator core 10 according to the first embodiment of the present application includes: a yoke 11, a tooth portion 12 and a shoe portion 13.

[0046] Among them, the yoke 11 is annular, the tooth portion 12 is arranged in the inner ring area of ​​the yoke 11, there are multiple tooth portions 12 and they are arranged at intervals along the circumference of the yoke 11, one end of the tooth portion 12 in the tooth height direction is connected to the yoke 11, and the other end of the tooth portion 12 in the tooth height direction is connected to the boot portion 13, a tooth groove a is formed between two adjacent tooth portions 12, and a groove b of the tooth groove a is formed between two adjacent boot portions 13.

[0047] Specifically, the yoke 11 is ring-shaped, and a radially extending tooth portion 12 is arranged on the radial inner side of the ring. A boot portion 13 is formed at one end of the tooth portion 12 away from the yoke 11, and tooth slots a are formed between adjacent tooth portions 12. The tooth slots a can be used to support and fix the stator winding. The boot portion 13 is formed at one end of the tooth portion 12 and is suitable for limiting the stator winding.

[0048] It should be pointed out that a corresponding riveted area needs to be formed on the yoke 11, and the riveted area is used to fix and limit the stator winding. The size of the riveted area will affect the passage of magnetic force and the mechanical strength of the stator; theoretically, the smaller the size of the tooth 12, the better, and a larger winding space can be obtained, but it is limited by the saturation magnetic flux density that the stator punching can accommodate. The common magnetic flux density of the stator punching is 1.6~1.8T. Therefore, according to the magnetic flux size obtained in the specification design of the motor 100, the width of the tooth 12 can be converted accordingly; the design point of the boot 13 lies in the slot b. The requirement for the slot b is actually the smaller the better, which is conducive to absorbing the magnetic force generated by the permanent magnet 30, but too small a size will also cause leakage.

[0049] Based on this, see Figure 5 As shown, the stator core 10 of the present application has twelve tooth slots a, and the ratio of the width W1 of the slot b to the inner diameter D1 of the stator core 10 is 0.05-0.15.

[0050] That is to say, in the embodiments of the present application, 0.05≤W1 / D1≤0.15, such as: 0.05, 0.10, 0.15, etc.

[0051] Thereby, the opening size of the slot b can be made more reasonable, avoiding the opening size of the slot b being too large or too small.

[0052] It can be understood that from the calculation formula of magnetic resistance R and magnetic permeance Λ: R=1 / μ0×δ / AΛ=1 / R=(μ0A) / δ, it can be known that magnetic resistance R and magnetic permeance Λ are directly and inversely proportional to the size of air gap δ.

[0053] Motor 100 leakage flux:

[0054] Φ σN =h mN λ σ B r A m ×10 -4 =h mN h Mp H m Λ σ ;

[0055] In summary, the leakage flux Φ σ and magnetic permeability σ The size of the slot b is proportional to the size of the magnetic resistance R and inversely proportional to the size of the magnetic resistance R. Therefore, when the width of the slot b satisfies 0.05≤W1 / D1≤0.15, the opening size of the slot b is more reasonable. Figure 1 The prior art shown in FIG. 1 shows that the air gap δ of the shoe portion 13 of the present invention is larger, and the larger air gap δ can increase the equivalent magnetic resistance R between adjacent shoe portions 13 and the magnetic permeance Λ σ becomes smaller, leakage flux Φ σ Become smaller.

[0056] Furthermore, the permanent magnet 30 provides a total magnetic flux Φ m :

[0057] Φ m =Φ δ +Φ σ ;

[0058] Φ m When the permanent magnet 30 remains unchanged, it is a constant value. σ When the main magnetic flux Φ decreases δ The larger magnetic flux can improve the performance of the motor 100 to a certain extent and effectively improve the motor efficiency.

[0059] Of course, the opening size of slot b is not the larger the better. When the slot is too large, the magnetic circuit between the stator and the rotor will become too narrow. When the main magnetic flux flows between the stator and the rotor, the magnetic resistance on the flow path will increase and the motor efficiency will also decrease.

[0060] According to the stator core 10 of the embodiment of the present application, by making the opening size of the slot b more reasonable, it is possible to avoid the opening size of the slot b being too large, so as to avoid excessive magnetic resistance on the flow path between the stator and the rotor. It is also possible to avoid the opening size of the slot b being too small, so as to reduce the leakage magnetic flux of the stator core 10, thereby reducing the leakage magnetic flux and increasing the main magnetic flux, so as to improve the motor efficiency and improve the performance of the motor 100 from two directions of increasing the main magnetic flux and reducing the magnetic resistance.

[0061] According to some embodiments of the present application, the ratio of the width W1 of the slot b to the inner diameter D1 of the stator core 10 is 0.122-0.127.

[0062] Preferably, the ratio of the width of the slot b to the inner diameter of the stator core 10 is: 0.122≤W1 / D1≤0.127. For example, if the inner diameter of the stator core 10 is 10 mm, and the size of the slot b is 1.22 mm to 1.27 mm, the opening size of the slot b is more reasonable. While reducing the magnetic resistance and leakage flux, it can also effectively limit the stator winding, thereby improving the support and fixing stability and reliability of the stator winding.

[0063] According to some embodiments of the present application, the inner diameter D1 of the stator core 10 is 55 mm to 57 mm, and the width W1 of the slot b is 3 mm to 8 mm.

[0064] Specifically, 55mm≤D1≤57mm corresponds to 3mm≤W1≤8mm. For example, if the inner diameter is 55mm, the width of the slot b can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc., any value that satisfies the above-mentioned proportional relationship can achieve the above-mentioned technical effect, which will not be repeated here.

[0065] like Figure 4 and Figure 5 As shown, in some embodiments, the yoke 11 includes a connecting section 111 located between two adjacent teeth 12 , and a ratio of a width W2 of the connecting section 111 to a width W4 of the teeth 12 is 0.45-1.0.

[0066] Specifically, the connecting section 111 can be formed as a riveted area, and a connecting section 111 is formed between two adjacent teeth 12. The connecting section 111 can be used to fix the stator winding, and the ratio of the radial dimension of the connecting section 111, that is, the width of the connecting section 111 to the circumferential dimension of the tooth 12, that is, the width of the tooth 12 satisfies: 0.45≤W2 / W4≤1.

[0067] Among them, the yoke 11, the tooth 12 and the rotor core 20 define a magnetic circuit, and the main magnetic flux flowing through the yoke 11 is a part of the main magnetic flux of the tooth 12. Therefore, the width dimension of the yoke 11 can be less than or equal to the width dimension of the tooth 12, ensuring that the main magnetic flux will not be magnetically saturated when flowing through the yoke 11, so as to improve the motor efficiency. At the same time, the width dimension of the yoke 11 cannot be set too small. A yoke 11 that is too small will cause the stability of the stator core 10 to decrease, and there is a risk of disintegration during the operation of the motor 100. In addition, during the operation of the motor 100, the electromagnetic force will cause the yoke 11 to vibrate greatly, exacerbating the working noise of the motor 100.

[0068] Based on this, the present application makes the minimum width of the connecting section 111 0.45 times the width of the tooth 12, and the maximum width is consistent with the width of the tooth 12, so as to make the size of the yoke 11 more reasonable, avoid the yoke 11 width being too small or too large, and take into account the working stability, reliability and motor efficiency of the motor 100.

[0069] Preferably, the yoke 11 includes a connecting section 111 located between two adjacent teeth 12 , and a ratio of a width W2 of the connecting section 111 to a width W4 of the teeth 12 is 0.455 to 0.465 (including end point values).

[0070] That is, 0.455≤W2 / W4≤0.465. For example, the width of the tooth portion 12 is 10 mm, and the width of the connecting section 111 is 4.55 mm to 4.65 mm, so as to take into account both the working stability and motor efficiency of the motor 100.

[0071] Exemplarily, the width of the connecting section 111 is 3 mm to 5 mm (including the end values), and the width of the tooth portion 12 is 4 mm to 6.7 mm (including the end values).

[0072] That is to say, the width W2 of the connecting section 111 can be 3mm, 4mm, 5mm, etc., and the corresponding width W4 of the tooth portion 12 can be 4mm, 4.7mm, 5.7mm, 6.7mm, etc., so that the size of the connecting section 111 satisfies the above-mentioned proportional relationship to take into account the working stability and motor efficiency of the motor 100.

[0073] like Figure 4 and Figure 5 As shown, according to some embodiments of the present application, the yoke 11 includes a connecting section 111 located between two adjacent teeth 12, the width of the connecting section 111 gradually decreases from the teeth 12 on both sides to the center, and the minimum width of the central area of ​​the connecting section 111 is the width W2 of the connecting section 111.

[0074] Specifically, the yoke 11 can be divided into a plurality of arc segments, the two ends of each arc segment are respectively connected to the adjacent tooth portion 12, and the middle area of ​​each arc segment forms a connecting segment 111. In the process of extending from the connecting segment 111 to the adjacent tooth portion 12, the width of the yoke 11 gradually increases and is generally trapezoidal, so as to improve the stability of the yoke 11, so as to make the structural strength of the yoke 11 higher, improve the vibration of the yoke 11, and reduce the vibration and working noise of the motor 100.

[0075] like Figure 5 As shown, in some embodiments, the angle α of the boot portion 13 is 113° to 155° (including the endpoint values), and the edge width W3 of the boot portion 13 is 0.5 mm to 0.7 mm (including the endpoint values).

[0076] Exemplarily, the angle α of the boot 13 can be 113°, 120°, 130°, 140°, 150°, 155°, etc., the edge width W3 of the boot 13 is smaller than the middle width, and the edge width can be 0.5mm, 0.6mm, 0.7mm, etc.

[0077] It is understandable that in the prior art, the length of the boot 13 is longer, the edge width of the boot 13 is larger, and the slot b is smaller, and the magnetic leakage at the top of the tooth 12 is larger, resulting in the thinner end of the boot 13 being prone to magnetic saturation, while the root of the boot 13 generally does not experience magnetic saturation.

[0078] Based on this, the present application can reduce the thickness of the boot 13 while effectively suppressing the magnetic flux leakage at the top of the tooth 12, thereby lengthening the tooth 12 and increasing the area of ​​the tooth slot a.

[0079] In this way, on the one hand, when the number of turns of the stator winding remains unchanged, the heat dissipation area of ​​the winding is increased, the heat dissipation capacity of the motor 100 is improved, and the copper loss P of the motor 100 is reduced. Cu , improve the motor efficiency, that is, the heat dissipation capacity of the motor 100 is improved, the stator winding temperature is reduced, the stator winding resistance is reduced, P Cu =I2×R, so the copper loss decreases; on the other hand, the number of stator winding turns can be increased to reduce the motor 100 current and make the motor 100 iron loss P Fe Decrease, thereby improving the motor efficiency, among which the iron loss P Fe ≈C Fe f 1.3 B m 2 G, motor 100 current drops, magnetic induction intensity B m Decreases, and the iron loss of motor 100 decreases.

[0080] The stator core 10 of the embodiment of the present application is described in detail below using a specific embodiment.

[0081] like Figure 4 and Figure 5 As shown, according to some embodiments of the present application, the specifications of each tooth slot a are consistent, the outer diameter D2 of the stator core 10 is 87mm~90mm, the inner diameter D1 of the stator core 10 is 55mm~57mm, the width W4 of the tooth portion 12 is 4mm~6.7mm, the width W1 of the slot b is 6mm-7mm, the yoke 11 includes a connecting section 111 located between two adjacent tooth portions 12, the width W2 of the connecting section 111 is 3mm-5mm, the angle α of the boot 13 is 113°~155°, and the edge width W3 of the boot 13 is 0.5mm~0.7mm.

[0082] That is, in this application, the slot a on the stator punching sheet of the stator core 10 is optimized. The tooth width in the slot a, the width of the slot b, the width of the connecting section 111, the angle of the boot 13 and the edge width of the boot 13 are optimized respectively.

[0083] Combination Figure 2 , Figure 3 as well as Figure 6 and Figure 7 As shown in FIG. 1 , after optimizing the tooth slot a, the leakage flux of the tooth portion 12 can be significantly reduced compared with the prior art. That is, the relevant simulation results are as follows: Figure 3 and Figure 4 As shown, from Figure 3 It can be seen that the number of leakage magnetic flux lines generated in area 1 and area 2 are 11 and 4 respectively. Figure 4 It can be seen that within the same position range, the numbers of leakage magnetic field lines generated in area 3 and area 4 are 9 and 3 respectively, the leakage magnetic field is greatly reduced, and all the above-mentioned technical effects can be achieved, which will not be repeated here.

[0084] like Figure 5 As shown, the stator according to the second embodiment of the present application includes a stator winding and the stator core 10 in the above embodiment. The stator winding is arranged on the tooth portion 12, and the technical effect is consistent with the above stator core 10, which will not be repeated here.

[0085] like Figure 4 As shown, the motor 100 according to the third embodiment of the present application includes a rotor 40 and the stator in the above embodiment, and the rotor 40 is rotatably disposed in the stator.

[0086] It can be understood that the calculation of motor efficiency η mainly involves the following powers, namely input power Pin, output power P out 、Iron loss P fe , Mechanical loss P mec , stray loss P ad 、Copper consumption P CuAmong them, mechanical loss and stray loss account for a small proportion. At the same time, it is extremely difficult to accurately separate these two losses in the test. Usually, the sum of iron loss, mechanical loss and stray loss is approximately considered to be iron loss P. fe . Copper consumption P Cu It refers to the current flowing through the stator winding, and the energy lost in the form of heat due to the existence of resistance on the stator winding; efficiency η is the output power P of the motor 100 out With input power P in The specific formula is as follows:

[0087] P fe =P Fe +P mec +P ad ;

[0088] P Cu =3×I2×R phase or P Cu =1.5×I2×R line;

[0089] R phase: single-phase resistance of the three-phase motor 100, that is, the resistance between each phase winding tap and the neutral point, R line: the resistance between two phase windings of the motor 100;

[0090] η=P out / Pin =1-P fe +P Cu / P in

[0091] Furthermore, the motor 100 of the present application, using the above-mentioned stator, can reduce leakage flux, increase main flux, reduce magnetic resistance, and increase the number of stator winding turns or improve stator winding heat dissipation to reduce copper loss and iron loss, thereby improving motor efficiency.

[0092] Simulated efficiency of motor 100 at different slot b sizes

[0093]

[0094] It can be seen from the above table that in an embodiment where the outer diameter of the stator core 10 is 87mm~90mm, the inner diameter of the stator core 10 is 55mm~57mm, and there are 12 tooth slots a, when the width of the slot b is 7mm, the efficiency of the motor 100 is the highest, and when the width of the slot b meets the above-mentioned limited range of the present application, the working efficiency of the motor 100 is higher, and the motor 100 can maintain a higher efficiency within a large speed and torque range.

[0095] See also Figure 8 As shown, the motor efficiency of the motor 100 is further simulated in the full speed range. From the simulation results, it can be seen that Figure 8In the medium speed range of 168.97 to 2968.97, the motor efficiency is above 87%, and when the motor 100 is used in an embodiment of an air conditioner, the speed range of the motor 100 is between 700rpm and 1100rpm, which is within the high efficiency range, so that the motor 100 can maintain high efficiency within a large speed and torque range, making the air conditioner more energy-saving and environmentally friendly.

[0096] It should be pointed out that the motor 100 of the embodiment of the present application is suitable as a motor 100 for an air conditioner, which can make the air conditioner more energy-efficient, but is not limited to being a motor 100 for an air conditioner. The stator core 10, stator and other structures and operations of the motor 100 according to the embodiment of the present application are known to ordinary technicians in the field and will not be described in detail here.

[0097] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0098] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0099] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0100] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0102] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that: include: A yoke, a tooth portion and a boot portion, wherein the yoke is annular, the tooth portion is arranged in the inner ring area of ​​the yoke, the tooth portion is multiple and is arranged at intervals along the circumference of the yoke, one end of the tooth portion in the tooth height direction is connected to the yoke, and the other end of the tooth portion in the tooth height direction is connected to the boot portion, a tooth slot is formed between two adjacent tooth portions, and a slot opening of the tooth slot is formed between two adjacent boot portions; wherein the stator core has twelve tooth slots, and the ratio of the width of the slot opening to the inner diameter of the stator core is 0.05-0.

15.

2. The stator core according to claim 1, characterized in that: The ratio of the width of the slot to the inner diameter of the stator core is 0.122-0.

127.

3. The stator core according to claim 1, characterized in that: The inner diameter of the stator core is 55 mm to 57 mm, and the width of the slot is 3 mm to 8 mm.

4. The stator core according to claim 1, characterized in that: The yoke portion includes a connecting section located between two adjacent tooth portions, and a ratio of a width of the connecting section to a width of the tooth portion is 0.45 to 1.

0.

5. The stator core according to claim 4, characterized in that: The ratio of the width of the connecting section to the width of the tooth portion is 0.455-0.

465.

6. The stator core according to claim 4, characterized in that: The width of the connecting section is 3 mm to 5 mm, and the width of the tooth portion is 4 mm to 6.7 mm.

7. The stator core according to claim 1, characterized in that: The yoke portion includes a connecting section located between two adjacent teeth portions, the width of the connecting section gradually decreases from the teeth portions on both sides to the center, and the minimum width of the central area of ​​the connecting section is the width of the connecting section.

8. The stator core according to claim 1, characterized in that: The angle of the boot portion is 113° to 155°, and the edge width of the boot portion is 0.5mm to 0.7mm.

9. The stator core according to any one of claims 1 to 8, characterized in that: The specifications of each tooth slot are consistent, the outer diameter of the stator core is 87mm~90mm, the inner diameter of the stator core is 55mm~57mm, the width of the tooth portion is 4mm~6.7mm, the width of the slot is 6mm-7mm, the yoke includes a connecting section located between two adjacent teeth, the width of the connecting section is 3mm-5mm, the angle of the boot is 113°~155°, and the edge width of the boot is 0.5mm~0.7mm.

10. A stator, characterized in that: The invention comprises a stator core according to any one of claims 1 to 9.

11. A motor, characterized in that: The invention comprises a rotor and a stator according to claim 10, wherein the rotor is rotatably disposed in the stator.

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