Stator and motor

Abstract

The utility model discloses a stator and a motor, and relates to the technical field of motors, the stator comprises a stator tooth lamination and a stator yoke lamination, the stator tooth lamination comprises a stator main body and a tooth part arranged at the periphery of the stator main body; the stator yoke lamination is annularly arranged and arranged on the periphery of the stator tooth lamination, the free end of the tooth part is provided with a positioning part, the inner circumferential wall of the stator yoke lamination is provided with a splicing matching part corresponding to the positioning part, the positioning part is in transition fit with the splicing matching part, the inner circumferential wall of the stator yoke lamination is also provided with a sleeve punching matching part, and the sleeve punching matching part is matched with the positioning part. The sleeve punching matching parts and the splicing matching parts are arranged at intervals in the circumferential direction of the stator yoke laminations, the sleeve punching matching parts are used for being in clearance fit with the positioning parts during sleeve punching, and when the stator yoke laminations are formed through punching, the sleeve punching lamination design that the stator tooth laminations are formed through punching by means of the middle positions of the annularly-arranged stator yoke laminations is utilized, so that the stator tooth laminations are formed. The stator tooth lamination and the stator yoke lamination do not need to be formed by two sets of dies respectively.

Description

Technical Field

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

[0002] In the design and production of electric motors, material utilization, equipment investment, production efficiency, precision, slot fill rate, and noise level are all very important indicators. At present, the stator structure of the inner rotor motor generally has several different structural forms, such as full circle, block, straight bar, and tooth yoke separation, and the performance of their key indicators is different. For the tooth yoke separation structure, this form can achieve precise wiring and high slot fill rate; the inner and outer circle molds are formed with high precision; the closed slot (magnetic bridge is alternately disconnected) stator structure has high rigidity, and at the same time it will greatly reduce torque pulsation and have the advantage of low vibration and noise. However, the tooth and yoke separated by the tooth yoke transmit torque through specific shape matching and interference. When the interference between the two is large, it will cause the tooth to be difficult to press in, or cause deformation or even fracture at the closed magnetic bridge; and when the interference is small, the connection reliability and torque transmission capacity of the stator assembly cannot be guaranteed.

[0003] Due to the splicing feature of the tooth yoke, sufficient bonding force can be guaranteed. However, to achieve this splicing feature, the stator tooth laminations and the stator yoke laminations need to be molded separately, which will greatly reduce material utilization and mold investment. Utility Model Content

[0004] The main purpose of the utility model is to provide a stator and a motor, aiming to solve the problem that the existing stator tooth laminations and stator yoke laminations need to be molded separately and the material utilization rate is low.

[0005] In order to achieve the above-mentioned purpose, the stator proposed by the utility model comprises:

[0006] A stator tooth lamination comprises a stator body and a tooth portion arranged on a circumferential side of the stator body; and,

[0007] stator yoke laminations are arranged in an annular shape and are arranged on the periphery of the stator tooth laminations;

[0008] In which, a positioning portion is provided at the free end of the tooth portion, and a splicing fitting portion corresponding to the positioning portion is provided on the inner circumferential wall of the stator yoke lamination. One of the positioning portion and the splicing fitting portion is set as a positioning protrusion, and the other is set as a fitting groove. There is a transition fit between the positioning portion and the splicing fitting portion. A sleeve-punch fitting portion is also provided on the inner circumferential wall of the stator yoke lamination. The sleeve-punch fitting portion and the splicing fitting portion are arranged at intervals in the circumferential direction of the stator yoke lamination, and the sleeve-punch fitting portion is used to be set with a clearance fit with the positioning portion during sleeve-punch.

[0009] In one embodiment, the gap between the positioning portion and the sleeve punching mating portion is not less than the lamination thickness of the stator.

[0010] In one embodiment, the end of the positioning protrusion is tapered in the outward direction, so as to have two outer side walls that are opposite and angled in the circumferential direction of the stator tooth lamination, and each of the outer side walls is on the side of a first polygon with the center of the stator as the geometric center;

[0011] Each of the sleeve punching mating portions is arranged as a first inclined groove, so as to have two first inner side walls that are opposite and angled in the circumferential direction of the stator yoke lamination, and each of the first inner side walls is on the side of a second polygon with the center of the stator as the geometric center;

[0012] Each of the splicing mating portions is arranged as a second inclined groove, so as to have two second inner side walls that are opposite and angled in the circumferential direction of the stator yoke lamination, and each of the second inner side walls is on the side of a third polygon with the center of the stator as the geometric center.

[0013] In one embodiment, the apothem of the first polygon is L1, and the apothem of the second polygon is L2, wherein L2 > L1.

[0014] In one embodiment, the lamination thickness of the stator is d, wherein d ≤ L2 - L1.

[0015] In one embodiment, the apothem of the first polygon is L1, and the apothem of the third polygon is L3, wherein L1 ≥ L3.

[0016] In one embodiment, the first polygon, the second polygon, and the third polygon are all regular polygons.

[0017] In one embodiment, the stator body includes a magnetic bridge connection portion provided between every two adjacent tooth portions, and the width of the magnetic bridge connection portion in the radial direction of the stator tooth lamination is w;

[0018] The lamination thickness of the stator is d, wherein d ≤ w.

[0019] The present utility model also provides a motor, and the motor includes:

[0020] A stator structure, including a plurality of stacked stators; and,

[0021] A rotor structure;

[0022] Wherein, the stator includes:

[0023] A stator tooth lamination, including a stator body and tooth portions arranged on the circumferential side of the stator body; and,

[0024] The stator yoke laminations are arranged in a ring shape and are disposed on the periphery of the stator tooth laminations;

[0025] Wherein, a positioning portion is provided at the free end of the tooth portion, and a mating group corresponding to the positioning portion is provided on the inner peripheral wall of the stator yoke laminations. The mating group includes two mating portions. The two mating portions include a punching and mating portion and a splicing and mating portion that are spaced apart along the circumferential direction of the stator yoke laminations. Among them, one of the positioning portion and each of the mating portions is provided as a positioning protrusion, and the other is provided as a mating groove. The positioning portion can be adapted to the punching and mating portion and the splicing and mating portion. The dimensional relationship between the positioning portion and the punching and mating portion is a clearance fit relationship, and the positioning portion and the splicing and mating portion are in an interference fit.

[0026] In one embodiment, the rotor structure includes a plurality of stacked rotor laminations;

[0027] The stator body is arranged in a ring shape and is disposed on the periphery of the rotor laminations, and a gap is provided between the stator tooth laminations and the rotor laminations.

[0028] In one embodiment, the stator structure further includes a winding structure. The winding structure includes a winding frame and windings wound around the peripheral side of the winding frame. The winding frame is sleeved on the periphery of a plurality of the tooth portions.

[0029] In the technical solution of the present utility model, when stamping the silicon steel sheet to form the stator tooth laminations and the stator yoke laminations, the positioning portion of the stator tooth laminations and the punching and mating portion can be designed to have a corresponding positional relationship. When stamping the stator yoke laminations on the silicon steel sheet, due to the clearance fit relationship between the positioning portion of the stator tooth laminations and the punching and mating portion, a margin is provided for the stamping and forming of the stamping die, so as not to affect the forming of the stator tooth laminations. Thus, the stator tooth laminations can be formed by stamping the area inside the ring of the stator yoke laminations, forming a punching structure of the stator tooth laminations and the stator yoke laminations. And the positioning portion and the splicing and mating portion are in an interference fit. When the stator tooth laminations and the stator yoke laminations are spliced and assembled, sufficient bonding force can be ensured to ensure the connection reliability and torque transmission capacity of the stator structure, effectively reducing the structural stress of the internal magnetic bridge of the stator tooth laminations and reducing the difficulty during the splicing (hot fitting) of the tooth yoke. By using the middle position of the stator yoke laminations arranged in a ring shape to stamp and form the punching lamination design of the stator tooth laminations when stamping the stator yoke laminations, it is not necessary to open two sets of dies to separately form the stator tooth laminations and the stator yoke laminations, solving the problem that the existing stator tooth laminations and stator yoke laminations need to be separately die - opened, resulting in low material utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0031] Figure 1 A schematic plan view of an embodiment of the stator provided by the present invention;

[0032] Figure 2 For Figure 1 A schematic plan view of the stator tooth lamination in

[0033] Figure 3 For Figure 1 A schematic plan view of the stator yoke lamination in

[0034] Figure 4 A schematic plan view of the stator and rotor laminations provided by the present invention;

[0035] Figure 5 A schematic partial structure view of the motor provided by the present invention;

[0036] Figure 6 For Figure 5 A cross-sectional view of

[0037] Figure 7 For Figure 5 A schematic structure view of the winding structure in

[0038] Figure 8 A schematic view of the progressive die for punching the stator and rotor laminations on the silicon steel sheet provided by the present invention.

[0039] Explanation of the reference numerals in the drawings:

[0040] 100, stator; 1, stator tooth lamination; 11, stator main body; 12, tooth part; 13, positioning part; 131, outer side wall; 14, magnetic bridge connection part; 2, stator yoke lamination; 21, punching and fitting part; 211, first inner side wall; 22, splicing and fitting part; 221, second inner side wall; a, first polygon; b, second polygon; c, third polygon;

[0041] 200, stator-rotor punching lamination; 3, rotor lamination;

[0042] 300, silicon steel sheet;

[0043] 10, stator structure; 20, rotor structure; 40, winding structure; 41, winding frame; 42, winding.

[0044] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0046] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0048] The present utility model provides a stator to solve the problem that the existing stator tooth laminations and stator yoke laminations need to be molded separately, resulting in low material utilization rate.

[0049] Please refer to Figures 1 to 4 and Figure 8, in an embodiment of the present utility model, the stator 100 includes a stator tooth lamination 1 and a stator yoke lamination 2. The stator tooth lamination 1 includes a stator body 11 and tooth portions 12 provided on the peripheral side of the stator body 11. The stator yoke lamination 2 is annularly arranged and is disposed on the periphery of the stator tooth lamination 1. Wherein, a positioning portion 13 is provided at the free end of the tooth portion 12, and a splicing and mating portion 22 corresponding to the positioning portion 13 is provided on the inner peripheral wall of the stator yoke lamination 2. One of the positioning portion 13 and the splicing and mating portion 22 is set as a positioning protrusion, and the other is set as a mating groove. The positioning portion 13 and the splicing and mating portion 22 are in transitional fit. A punching and fitting portion 21 is further provided on the inner peripheral wall of the stator yoke lamination 2. The punching and fitting portion 21 and the splicing and mating portion 22 are arranged at intervals in the circumferential direction of the stator yoke lamination 2. The punching and fitting portion 21 is used for clearance fit with the positioning portion 13 during punching.

[0050] It should be noted that the stator tooth lamination 1 is set in a tooth shape and usually winds a stator coil (winding 42). By passing an electric current, a magnetic field is generated, which interacts with the rotor to generate a rotational torque. The stator yoke lamination 2 provides support for the stator tooth lamination 1 to ensure the overall structural stability of the stator part, supports the stator tooth lamination 1 and forms a closed magnetic circuit.

[0051] The positioning portion 13 is provided at the free end of the tooth portion 12 to ensure stable positioning during the assembly or operation of the stator tooth lamination 1 and the stator yoke lamination 2. The splicing and mating portion 22 is provided on the stator yoke lamination 2, and the positioning portion 13 and the splicing and mating portion 22 are in transitional fit, so that the stator tooth lamination 1 can be firmly fitted with the stator yoke lamination 2.

[0052] It should be noted that the toothed part and the yoke part with the teeth and yoke separated transmit torque through a specific shape fit and interference amount. When the interference amount between the two is large, it will cause difficulties in pressing the toothed part 12, or cause deformation or even fracture at the closed magnetic bridge. When the interference amount is small, the connection reliability and torque transmission ability of the stator assembly cannot be guaranteed. Due to the tooth-yoke splicing feature, sufficient bonding force can be ensured. Since the stator tooth laminations and the stator yoke laminations need to be assembled and spliced after being respectively stamped to form a complete stator lamination, too large a gap cannot be formed at the splicing position of the stator tooth laminations and the stator yoke laminations. If it is designed that the stator tooth laminations and the stator yoke laminations are directly nested and punched on the same silicon steel sheet, in order to ensure the stamping accuracy of the stator tooth laminations and the stator yoke laminations and reduce the stamping difficulty, a stamping gap will be reserved corresponding to the splicing position of the stator tooth laminations and the stator yoke laminations. Then, the splicing position of the stator tooth laminations and / or the stator yoke laminations will be smaller than the ideal design size. Then, during assembly, there will be too large a gap between the stator tooth laminations and the stator yoke laminations, and reliable connection and torque transmission ability cannot be guaranteed. Then, in the related art, in order to ensure their respective dimensional accuracies, the stator tooth laminations and the stator yoke laminations need to be separately die-cast, and the material utilization rate and die investment will be greatly reduced.

[0053] It should also be noted that since a nested punching and fitting part 21 is further provided on the stator yoke lamination 2, before stamping, the nested punching and fitting part 21 is arranged in relative cooperation with the positioning part 13. In order to ensure the dimensional accuracy of the positioning part 13, a stamping gap can be reserved between the nested punching and fitting part 21 and the positioning part 13. It can be understood that the splicing and fitting part 22 and the nested punching and fitting part 21 are spaced apart in the circumferential direction of the stator yoke lamination 2 and are arranged corresponding to the position between two adjacent toothed parts 12. Then, when the positioning part 13 is formed, the splicing and fitting part 22 is not affected by it and can ensure sufficient dimensional accuracy and can be in transitional fit with the positioning part 13. Therefore, after stamping the stator tooth lamination 1 and the stator yoke lamination 2, the stator tooth lamination 1 and the stator yoke lamination 2 are two separate laminations. The stator tooth lamination 1 can be rotated and adjusted in position relative to the stator yoke lamination 2. The positioning part 13 rotates from the position opposite to the nested punching and fitting part 21 to the position opposite to the splicing and fitting part 22 and is in transitional fit with the splicing and fitting part 22.

[0054] It can be understood that the shapes of the positioning protrusion and the fitting groove can preferably be shapes adapted to each other. For example, the fitting groove can be set as an arc groove, an inclined groove or a square groove.

[0055] In the technical solution of the present utility model, when stamping the silicon steel sheet 300 to form the stator tooth lamination 1 and the stator yoke lamination 2, the positioning portion 13 of the stator tooth lamination 1 and the punching and fitting portion 21 can be designed to have a corresponding positional relationship. When stamping the stator yoke lamination 2 on the silicon steel sheet 300, due to the dimensional relationship between the positioning portion 13 of the stator tooth lamination 1 and the punching and fitting portion 21 being an interference fit relationship, a margin is provided for the stamping and forming of the stamping die, so as not to affect the forming of the stator tooth lamination 1. Thus, the region inside the ring of the stator yoke lamination 2 can be used to stamp and form the stator tooth lamination 1, forming a punching structure of the stator tooth lamination 1 and the stator yoke lamination 2. And the positioning portion 13 and the splicing and fitting portion 22 are in a transition fit. When the stator tooth lamination 1 and the stator yoke lamination 2 are spliced and assembled, sufficient bonding force can be ensured to guarantee the connection reliability and torque transmission capacity of the stator structure 10, effectively reducing the structural stress of the magnetic bridge in the stator tooth lamination 1 and reducing the difficulty during the splicing (thermal sleeve) of the tooth and yoke. By using the middle position of the annular stator yoke lamination 2 when stamping the stator yoke lamination 2 to stamp and form the punching lamination design of the stator tooth lamination 1, there is no need to open two sets of dies to separately form the stator tooth lamination 1 and the stator yoke lamination 2, solving the problem that the existing stator tooth lamination 1 and stator yoke lamination 2 need to be separately die - opened, resulting in low material utilization rate.

[0056] Further, please refer to Figure 4 , in this embodiment, the gap between the positioning portion 13 and the punching and fitting portion 21 is not less than the sheet thickness of the stator 100.

[0057] It can be understood that when stamping the silicon steel sheet 300, the region between the positioning portion 13 and the punching and fitting portion 21 forms a waste material area. If the gap between the positioning portion 13 and the punching and fitting portion 21 is set to be less than the sheet thickness of the stator 100, then the waste material area may be stuck due to excessive friction with the die wall when being pushed out of the die, and it cannot effectively contact the material discharging device, thus affecting its normal operation. Increasing the waste material width can reduce the friction force per unit area, making the waste material easier to be discharged. The wider waste material has better rigidity, is not easily bent or deformed, and is more likely to move along a predetermined path, helping it to smoothly pass through the material discharging channel of the die and avoiding deflection or blockage during the discharging process.

[0058] Further, please refer to Figure 2 and Figure 3, in this embodiment, the end of the positioning protrusion is tapered in the outward direction, so as to have two outer side walls 131 that are opposite and angled in the circumferential direction of the stator tooth lamination 1, and each of the outer side walls 131 is located on the side of a first polygon a with the center of the stator 100 as the geometric center; each of the punching and fitting portions 21 is arranged as a first inclined groove, so as to have two first inner side walls 211 that are opposite and angled in the circumferential direction of the stator yoke lamination 2, and each of the first inner side walls 211 is located on the side of a second polygon b with the center of the stator 100 as the geometric center; each of the splicing and fitting portions 22 is arranged as a second inclined groove, so as to have two second inner side walls 221 that are opposite and angled in the circumferential direction of the stator yoke lamination 2, and each of the second inner side walls 221 is located on the side of a third polygon c with the center of the stator 100 as the geometric center.

[0059] By making the side walls of the positioning protrusion, the first inclined groove and the second inclined groove of the stator tooth lamination 1 located on specific polygons, in this way, it is more convenient to manufacture the stamping tool, and this structural form enhances the structural strength of the stator yoke lamination 2, preventing deformation or resonance at high rotational speeds. When the motor rotates, the good cooperation between the stator tooth lamination 1 and the inclined groove improves the bonding force between the two, making the entire stator structure 10 more stable, thereby improving the mechanical performance of the motor.

[0060] It can be understood that the punching and fitting portion 21 is arranged as a first inclined groove, and the splicing and fitting portion 22 is arranged as a second inclined groove. The shape of the first inclined groove can be set to be the same as or different from the shape of the second inclined groove. When the shape of the first inclined groove is the same as the shape of the second inclined groove, the groove depth of the first inclined groove can be set to be greater than the groove depth of the second inclined groove, so that when the positioning protrusion cooperates with the first inclined groove, the dimensional relationship between the two is a clearance fit relationship, and when cooperating with the second inclined groove, an interference fit can be formed. Of course, when the shape of the first inclined groove is different from the shape of the second inclined groove, in order to make the positioning convex portion form an interference fit with the second inclined groove, the shape of the positioning convex portion can be adapted to the shape of the second inclined groove, and the spacing between the outer side wall 131 of the positioning convex portion and the inner side wall of the first inclined groove is set to be unequal, and the above effects can also be achieved.

[0061] Specifically, please refer to Figure 2 and Figure 3 , in this embodiment, the apothem of the first polygon a is L1, and the apothem of the second polygon b is L2, where L2 > L1.

[0062] When L2 > L1, since each of the outer side walls 131 is on the side of the first polygon a with the center of the stator 100 as the geometric center, and each of the first inner side walls 211 is on the side of the second polygon b with the center of the stator 100 as the geometric center, it shows that the dimension from the inner side wall of the first skew slot to the center of the stator 100 is greater than the dimension from the two outer side walls 131 of the positioning protrusion to the center of the stator 100. In this way, a clearance fit relationship between the two can be achieved.

[0063] Specifically, in this embodiment, the thickness of the stator 100 is d, where d ≤ L2 - L1. With this setting, when stamping the silicon steel sheet 300, the width of the waste area formed between the first polygon a and the second polygon b is greater than or equal to the thickness of the silicon steel sheet 300, making it easier for the waste to be discharged, helping it to pass smoothly through the discharge channel of the die, and avoiding skew or blockage during the discharge process.

[0064] Specifically, in this embodiment, the apothem of the first polygon a is L1, and the apothem of the third polygon c is L3, where L1 ≥ L3. Since each of the outer side walls 131 is on the side of the first polygon a with the center of the stator 100 as the geometric center, and each of the second inner side walls 221 is on the side of the third polygon c with the center of the stator 100 as the geometric center, thus, when L1 = L3, theoretically, the positioning protrusion and the second skew slot just fit perfectly. When stamping the silicon steel sheet 300, due to manufacturing errors, an interference fit or a clearance fit may be formed between the positioning protrusion and the second skew slot. When L1 > L3, an interference fit is formed between the positioning protrusion and the second skew slot, ensuring the connection reliability and torque transmission ability of the stator assembly.

[0065] Furthermore, the first polygon a, the second polygon b, and the third polygon c are all set as regular polygons. The standardized regular polygon design can simplify the processing technology, facilitate the mass production and assembly of the stator, and at the same time ensure the consistency and interchangeability between various components.

[0066] At the same time, since the first polygon a is set as a regular polygon, it shows that each of the tooth parts 12 is evenly distributed in space. This even distribution helps to form a more uniform magnetic field, which is very beneficial for reducing the fluctuation of the magnetic flux density, reducing the vibration and noise during the operation of the motor.

[0067] Furthermore, please refer to Figure 2, in this embodiment, the stator body 11 includes a magnetic bridge connection portion 14 disposed between every two adjacent tooth portions 12, and the width of the magnetic bridge connection portion 14 in the radial direction of the stator tooth lamination 1 is w; the thickness of the stator 100 is d, where d ≤ w. In this way, it is ensured that the connection between the stator tooth laminations 1 is strong enough, while avoiding the magnetic bridge connection portion 14 from being too weak, thus affecting the magnetic flux transmission efficiency and the overall mechanical strength of the motor.

[0068] The present utility model also proposes a motor. Please refer to Figures 5 to 7 , the motor includes a stator structure 10 and a rotor structure 20. The specific structure of the stator structure 10 refers to the above embodiment. Since this motor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0069] Specifically, in this embodiment, the rotor structure 20 includes a plurality of stacked rotor laminations 3; the stator body 11 is annularly arranged and is disposed outside the rotor laminations 3, and a gap is provided between the stator tooth laminations 1 and the rotor laminations 3. In this way, when stamping the rotor laminations 3 on the silicon steel sheet 300, this gap provides a margin for the stamping and forming of the stamping die, so as not to affect the forming of the rotor laminations 3, and thus the area inside the ring of the stator tooth laminations 1 can be used to stamp and form the rotor laminations 3, forming a nested stamping structure of the stator tooth laminations 1 and the stator yoke laminations 2.

[0070] It should be noted that the stator structure 10 of the inner rotor motor is most commonly set as a full-circle structure. Its stator and rotor are formed by nested stamping with a set of dies, with high material utilization rate, high stamping efficiency, high precision, and low equipment investment; however, the winding process is an inner winding method, with large slot openings, low slot area utilization rate, uneven wire arrangement, resulting in low slot fill factor, and the motor efficiency and power are limited; at the same time, large slot openings will lead to large torque ripple and poor vibration and noise. The segmented and straight-bar types are also very common structural forms. Compared with the full-circle type, they can achieve precise wire arrangement and high slot fill factor; two sets of dies are used for the stator and rotor respectively, and the material utilization rate is slightly improved, but the investment in dies and equipment is large, and the production efficiency is reduced; at the same time, after piecing / curving into a circle, it needs to be welded and fixed, and the precision after forming a circle is poor, affecting the uniformity of the air gap between the stator and rotor, thus deteriorating the vibration and noise.

[0071] Furthermore, please refer to Figure 7 , in this embodiment, the stator structure 10 further includes a winding structure 40. The winding structure 40 includes a winding frame 41 and a winding 42 wound around the periphery of the winding frame 41. The winding frame 41 is sleeved outside a plurality of the tooth portions 12.

[0072] In this embodiment, a structure with separated teeth and yoke is adopted, and the winding 42 can be wound around the winding frame 41. As many windings 42 as possible can be wound around the winding frame 41, enabling precise wire arrangement, high slot fill factor, and improved performance of the motor.

[0073] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A stator, characterized in that, Comprising: A stator tooth lamination, including a stator body and tooth portions provided on the circumferential side of the stator body; And, A stator yoke lamination, arranged in a ring shape and provided on the periphery of the stator tooth lamination; Wherein, a positioning portion is provided at the free end of the tooth portion, and a splicing and mating portion corresponding to the positioning portion is provided on the inner peripheral wall of the stator yoke lamination. One of the positioning portion and the splicing and mating portion is set as a positioning protrusion, and the other is set as a mating groove. The positioning portion and the splicing and mating portion are in a transition fit. A punching and mating portion is further provided on the inner peripheral wall of the stator yoke lamination. The punching and mating portion and the splicing and mating portion are arranged at intervals in the circumferential direction of the stator yoke lamination. The punching and mating portion is used for a clearance fit with the positioning portion during punching.

2. The stator according to claim 1, wherein The clearance between the positioning portion and the punching and mating portion is not less than the sheet thickness of the stator.

3. The stator according to claim 1, wherein The end of the positioning protrusion is tapered in the outward direction to have two outer side walls that are opposite and angled in the circumferential direction of the stator tooth lamination. Each of the outer side walls is on the side of a first polygon with the center of the stator as the geometric center; Each of the punching and mating portions is set as a first inclined groove to have two first inner side walls that are opposite and angled in the circumferential direction of the stator yoke lamination. Each of the first inner side walls is on the side of a second polygon with the center of the stator as the geometric center; Each of the splicing and mating portions is set as a second inclined groove to have two second inner side walls that are opposite and angled in the circumferential direction of the stator yoke lamination. Each of the second inner side walls is on the side of a third polygon with the center of the stator as the geometric center.

4. The stator according to claim 3, characterized in that The apothem of the first polygon is L1, and the apothem of the second polygon is L2, wherein, L2 > L1.

5. The stator according to claim 4, wherein The sheet thickness of the stator is d, wherein, d ≤ L2 - L1.

6. The stator according to claim 3, wherein The apothem of the first polygon is L1, and the apothem of the third polygon is L3, wherein, L1 ≥ L3.

7. The stator according to claim 3, characterized in that, The first polygon, the second polygon, and the third polygon are all set as regular polygons.

8. The stator according to claim 1, characterized in that, The stator body includes a magnetic bridge connection portion provided between every two adjacent tooth portions. The width of the magnetic bridge connection portion in the radial direction of the stator tooth lamination is w; The sheet thickness of the stator is d, wherein, d ≤ w.

9. A motor, characterized in that, Comprising: A stator structure, including a plurality of stacked stators, and the stator is set as the stator according to any one of claims 1 to 8; And, A rotor structure.

10. The motor according to claim 9, characterized in that, The rotor structure includes a plurality of stacked rotor laminations; The stator body is arranged in a ring shape and provided on the periphery of the rotor laminations. A clearance is provided between the stator tooth lamination and the rotor laminations.

11. The motor according to claim 10, wherein, The stator structure further includes a winding structure. The winding structure includes a winding frame and windings wound around the circumferential side of the winding frame. The winding frame is sleeved on the periphery of a plurality of the tooth portions.

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