Split assembled spiral-wound stator lamination, stator core and motor

Abstract

A split assembled helical winding stator sheet includes a yoke and a tooth group, the tooth group includes a tooth body group and a tooth top group, the yoke is integrally formed with the tooth body group, the yoke and the tooth body group are helically wound and stacked in correspondence, the tooth top group is independent of the yoke and the tooth body group, the tooth top group is stacked and fixed with the tooth body group; a stator core mainly composed of a plurality of the stator sheets helically wound and stacked; a motor including the stator core. The stator sheet is split into two parts that can be assembled, the traditional punching method can still be used to improve the utilization of raw materials, the width of the tooth top group is no longer limited by the tooth body group, and the width of the slot formed by the tooth top group meets the design requirements of motor performance, which greatly improves the performance of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the motor technical field, specifically is a kind of spiral winding stator lamination, stator core and motor of split assembly. BACKGROUND

[0002] The existing motor core is made by lamination of stamping sheet, and the specific form of the stamping sheet mainly includes ring-shaped stator lamination and spiral winding stator lamination.

[0003] The ring-shaped stator lamination is generally punched by using the whole ring punching method, that is, the required product is directly punched out on a base sheet of raw material by using a die, and multiple ring-shaped stator laminations are laminated to form a core. Since the center circular block portion, which is a waste material matched with the motor shaft, is directly punched off on the base sheet during the manufacturing process of the ring-shaped stator lamination, the material utilization rate of this method is very low.

[0004] The spiral-wound stator punching sheet is generally punched by double-row staggered interpolation, that is, an initial double-row straight strip punching sheet is punched on a base sheet of raw material by using a die, which has been maturely applied in the prior art, such as a kind of electric vehicle winding core disclosed in Chinese patent application No. CN201320850709.1, which comprises an annular yoke and tooth portions uniformly distributed on the outer edge of the yoke, and the tooth portions are embedded line grooves; the electric vehicle winding core is formed by winding and stacking the straight-line strip punching sheet in a spiral path, and the tooth portion comprises a tooth root and a tooth crown, and the tooth root is provided with a driving pin cooperation groove at the connection with the yoke. In the manufacturing process of the spiral-wound stator punching sheet, a large amount of waste material will not be generated in the center circular block part when manufacturing the annular stator punching sheet, and the double-row straight strip punching sheet can be punched in one step, so that the material utilization rate is greatly improved, the cost is reduced, and the production is improved. However, the existing spiral-wound stator punching sheet also has new product performance problems. Since the double-row staggered interpolation punching method is to form the tooth body of one row in the embedded line groove of the other row, the tooth top width is inevitably limited by the line groove width, and the tooth top width cannot be large enough. There is an initial gap between the tooth tops of the straight strip punching sheet, and after the straight strip punching sheet is spirally wound and formed, the gap between the tooth tops will be further expanded, that is, the embedded line groove opening of the final stator punching sheet will be relatively wide, and the wider the opening is, the larger the torque will be, the smaller the torque coefficient will be, and the performance of the motor will be deteriorated, such as large current, low efficiency, large noise, large vibration, easy deformation and other adverse consequences. At present, in order to avoid the above-mentioned problems, some of such punching sheets are punched with some notched portions at the joint of the tooth body and the yoke to increase the width of the tooth top itself, so as to reduce the opening width of the final punching sheet as much as possible. Although it is feasible, it cannot completely solve the problem. Because for the tooth portion and the yoke, they are in the place where the magnetic density of the motor is the largest, and the notches on them will affect the magnetic density of the motor, resulting in local large magnetic density, finally resulting in large motor magnetic circuit reluctance, low motor efficiency, poor yoke rigidity, and periodic deformation of the stator core in the radial direction of the rotor when the motor runs at high speed, which produces electromagnetic noise of integer multiple of the fundamental frequency. SUMMARY

[0005] One of the technical purposes of the present application is to provide a split assembled spiral-wound stator punching sheet to solve the problems in the prior art.

[0006] The specific technical scheme of the application is as follows: a split assembled spiral winding stator lamination, comprising a yoke and a tooth group, the tooth group is uniformly spaced arranged on the outer side of the yoke and forms a wire slot for winding, the tooth group comprises a matched tooth body group and a tooth top group, the yoke is integrally formed with the tooth body group, the yoke and the tooth body group are used for common spiral winding and are respectively corresponding stacked up and down; the tooth top group is independent of the yoke and the tooth body group, the tooth top group is used for stacking up and down and is spliced and fixed with the tooth body group which is also stacked.

[0007] As preferred, the tooth body group comprises a first tooth body and a second tooth body, the second tooth body comprises a main body part coinciding with the first tooth body and a tooth top matching part additionally having relative to the first tooth body, only the first tooth body or only the second tooth body can be provided on the same yoke or the first tooth body and the second tooth body are both provided, the interval between adjacent first tooth bodies, the interval between adjacent second tooth bodies and the interval between adjacent first tooth bodies and the second tooth bodies are the same; the tooth top group comprises a first tooth top and a second tooth top, the first tooth top comprises a main body part coinciding with the second tooth top and a tooth body matching part additionally having relative to the second tooth top, the first tooth top is spliced into a single complete tooth with the first tooth body, the second tooth top is spliced into a single complete tooth with the second tooth body, the whole spliced by the second tooth top and the tooth top matching part is the same in shape as the first tooth top.

[0008] As preferred, the tooth top matching part and the tooth body matching part are provided with mutual fixing parts for mutual connection and fixing of the second tooth body and the first tooth top stacked up and down.

[0009] As preferred, the first tooth top and the second tooth top are both provided with tooth top self-fixing parts for mutual connection and fixing of the first tooth top stacked up and down or the second tooth top stacked up and down or the first tooth top and the second tooth top stacked up and down.

[0010] As preferred, the first tooth body and the second tooth body are both provided with tooth body self-fixing parts for mutual connection and fixing of the first tooth body stacked up and down or the second tooth body stacked up and down or the first tooth body and the second tooth body stacked up and down.

[0011] As preferred, the yoke is provided with a yoke self-fixing part for mutual connection and fixing of the yoke stacked up and down.

[0012] As preferred, the inner periphery of the yoke is provided with a winding process slot, the winding process slot is aligned with each tooth body in the tooth body group.

[0013] Still another technical purpose of the present application is to provide a stator core to solve the problems in the prior art.

[0014] The specific technical solution of the present application is as follows: a stator core mainly composed of a plurality of the stator punching sheets spirally wound and stacked up and down.

[0015] As a preference, the yoke part, the tooth body group and the tooth top group are each stacked up and down and fixed, and the joint surface of the stacked tooth body group and the stacked tooth top group is not a vertical flat surface but a surface with complementary concave-convex parts, and the tooth body group and the tooth top group are fixed to each other through the complementary concave-convex parts.

[0016] Still another technical purpose of the present application is to provide an electric machine to solve the problems in the prior art.

[0017] The specific technical solution of the present application is as follows: an electric machine comprising the stator core.

[0018] The technical advantages of the present application are that the stator punching sheet, the stator core and the electric machine, by being punched into a part composed of the tooth top group and another part composed of the yoke part and the tooth body group, not only can still use the traditional punching method so that the tooth body group and the tooth top group are formed without affecting each other and can be made as needed, further improving the utilization rate of raw materials and reducing costs, but also make the single tooth top width of the tooth top group no longer limited by the slot width formed by the tooth body group and can be made as needed, further making the width of the slot formed by the tooth top group meet the design requirements of the performance of the electric machine, ensuring good torque and torque coefficient of the electric machine, avoiding problems such as large current, large noise, large vibration, low efficiency and easy deformation of the electric machine, effectively solving the contradiction between high material utilization rate and electric machine performance in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure schematic diagram of the stator punching sheet or the stator core of the embodiment of the present application;

[0020] Figure 2 The structure schematic diagram of the stator punching sheet or the stator core of the embodiment of the present application;

[0021] Figure 3 The structure schematic diagram of the yoke part and the tooth body group integrally formed in the embodiment of the present application;

[0022] Figure 4 The structure schematic diagram of the tooth top group in the embodiment of the present application;

[0023] Figure 5 The sectional view of the tooth top group and the tooth body group fixed in the embodiment of the present application;

[0024] The names of the parts corresponding to the numbers in the figure are as follows: 1-yoke, 2-tooth group, 21-tooth body group, 211-first tooth body, 212-second tooth body, 2121-tooth top matching part, 22-tooth top group, 221-first tooth top, 2211-tooth body matching part, 222-second tooth top, a-interlocking part, b-tooth top self-fixing part, c-tooth body self-fixing part, d-yoke self-fixing part, and e-winding process slot. DETAILED DESCRIPTION

[0025] The application will be further described below by specific embodiments with reference to the accompanying drawings:

[0026] Figure 1 、 Figure 2 The embodiment shown in the figure can be regarded as an embodiment of a split assembled helical winding stator lamination, and also as an embodiment of a stator core composed of the stator lamination. In terms of the angle of the stator lamination, it includes a yoke 1 and a tooth group 2, the tooth group 2 is uniformly and spacedly arranged on the outside of the yoke 1 and forms a wire slot 3 for winding, the tooth group 2 includes a tooth body group 21 and a tooth top group 22 matched with each other, the yoke 1 and the tooth body group 21 are integrally formed by stamping, specifically, a double-row staggered interpolation straight strip-shaped initial lamination without the tooth top group 22 is punched on a raw material base sheet by using a corresponding die, see Figure 3 , then the straight strip-shaped lamination is helically wound, that is, the yoke 1 and the tooth body group 21 are helically wound together and stacked correspondingly to obtain a finished stator lamination without the tooth top group 22; the tooth top group 22 is independent of the yoke 1 and the tooth body group 21 and is also formed by stamping, see Figure 4 , specifically, the tooth top group 22 connected laterally between adjacent individuals is punched on a raw material base sheet by using a corresponding die, the lateral connection part can have an indentation to facilitate the separation of individual tooth tops, and the tooth top group 22 is used for stacking upward and downward and fixedly combined with the tooth body group 21 stacked in the same way.

[0027] Unlike the traditional stator lamination, the width of the single tooth top must not exceed the interval between the adjacent tooth bodies when stamping. The individual forming of the tooth top group 22 can be freely set according to the actual motor performance requirements in terms of width and shape, and is no longer limited by the interval between the adjacent tooth bodies. Therefore, the slot opening of the final stator lamination can be as small as possible to meet the motor performance requirements, so that the motor torque is as small as possible and the torque coefficient is as large as possible. The yoke 1 and the tooth body group 21 can also be freely set after being separated from the common forming of the tooth top group 22, so that the slot width and the yoke rigidity can also meet the motor performance requirements. Therefore, the motor performance can be greatly improved, and the current, efficiency, noise, vibration, and deformation resistance can be well performed. Moreover, the part composed of the yoke 1 and the tooth body group 21 can still use the traditional double-row staggered interpolation stamping method, and the tooth top group 22 can also be obtained by stamping. The material utilization rate is still high, and there is no material waste. The cost is still low and easy to control. The applicant shows through tests that the material utilization rate is about 70% when using the same double-row staggered interpolation stamping method to stamp an integrated stator lamination. When the split stator lamination of the present embodiment is stamped, the material utilization rate is relatively increased to about 75%.

[0028] The tooth body group 21 includes a first tooth body 211 and a second tooth body 212. The second tooth body 212 includes a main body part coinciding with the first tooth body 211 and a tooth top matching part 2121 additionally provided relative to the first tooth body 211. The first tooth body 211 and the second tooth body 212 actually have a length difference, that is, the tooth top matching part 2121 is the relatively additional part, and the shape of the tooth top matching part 2121 is mainly determined according to the tooth top of the matching tooth top group 22. The tooth top group 22 includes a first tooth top 221 and a second tooth top 222. The first tooth top 221 includes a main body part coinciding with the second tooth top 222 and a tooth body matching part 2211 additionally provided relative to the second tooth top 222. The first tooth top 221 and the first tooth body 211 are spliced into a single complete tooth, and the second tooth top 222 and the second tooth body 212 are spliced into a single complete tooth. The whole spliced by the second tooth top 222 and the tooth top matching part 2121 has the same shape as the first tooth top 221. The first tooth top 221 shown in the figure is a tooth top with a relative protruding part, and the second tooth top 222 is a tooth top with a relative notched part, and the shape of the notched part is the shape of the tooth top matching part 2121. Such a setting is to make the tooth body group 21 form alternating parts stacked by a plurality of first tooth bodies 211 and a plurality of second tooth bodies 212 after the stator lamination is spirally wound and stacked into an iron core, and the tooth top group 22 forms alternating parts stacked by a plurality of first tooth tops 221 and a plurality of second tooth tops 222. That is, the splicing surfaces of the tooth body group 21 and the tooth top group 22 have recessed socket parts and protruding plug parts instead of vertical flatness, as shown inFigure 1 、 Figure 5 , which is to insert and splice the tooth top group 22 and the tooth body group 21 with each other, accurate positioning is convenient, and the tooth body group 21 and the tooth top group 22 are fixed after being stacked in the same type respectively, and then are conveniently and firmly positioned and fixed through the concave-convex complementary parts.

[0029] Regarding the setting of the tooth body group 21 and the tooth top group 22 being stacked in the same type respectively, the first tooth top 221 and the second tooth top 222 are both provided with a tooth top self-fixing part b, which is used for connecting and fixing the first tooth top 221 stacked above and below or the second tooth top 222 stacked above and below or the first tooth top 221 and the second tooth top 222 stacked above and below with each other; the first tooth body 211 and the second tooth body 212 are both provided with a tooth body self-fixing part c, which is used for connecting and fixing the first tooth body 211 stacked above and below or the second tooth body 212 stacked above and below or the first tooth body 211 and the second tooth body 212 stacked above and below with each other. The tooth top self-fixing part b and the tooth body self-fixing part c can be set as self-riveting points or self-docking parts, etc., such as setting a matching groove on the upper surface of a single tooth top or tooth body and a matching convex on the lower surface, which are matched and buckled together to realize the self-fixing of the tooth top and the tooth top and the self-fixing of the tooth body and the tooth body, convenient positioning and connection, the tooth body group 21 will not be separated and popped up, and the tooth top group 22 will not be separated and scattered.

[0030] Regarding the mutual fixing between the tooth body group 21 and the tooth top group 22, see Figure 5 The tooth top matching part 2121 and the tooth body matching part 2211 are provided with a mutual fixing part a, which is used for connecting and fixing the second tooth body 212 stacked above and below and the first tooth top 221 with each other, and the mutual fixing part a can be set as a rivet hole, which is connected through a rivet to fix the tooth top matching part 2121 and the tooth body matching part 2211 together, that is, to fix the tooth body group 21 and the tooth top group 22 stacked and self-fixed with each other, so as to be assembled into one body.

[0031] It is worth mentioning that the shape of the tooth top and the tooth body or the shape of the tooth top matching part 2121 and the tooth body matching part 2211 can also have other deformation designs different from those in the drawings of the embodiment, as long as the two can be connected and fixed with each other when the tooth body group 21 and the tooth top group 22 constitute a part of the stator core, and the splicing surface of the two is not a vertical flat surface but a surface with concave-convex complementary parts.

[0032] In addition to the tooth body group 21 and the tooth top group 22 needing to be self-fixed, the yoke portion 1 also needs to be self-fixed after being spirally wound and stacked up and down, so the yoke portion self-fixing portion d is also provided on the yoke portion 1, which also adopts the same self-riveting point or self-buckling portion as the tooth top self-fixing portion b or the tooth body self-fixing portion c, and is convenient for positioning and connecting, and prevents the yoke portion 1 from being bounced up. In addition, the inner periphery of the yoke portion 1 aligned with each tooth body in the tooth body group 21 is also provided with a winding process groove e, which facilitates the winding and forming of the yoke portion 1, and the winding process groove e is provided at a position where the magnetic density is relatively low, and the slotting has a relatively small impact on the magnetic density of the yoke portion 1. In the embodiment, the winding process groove e is provided in a semicircular shape, which can also be provided in a rectangular, triangular or other regular polygonal or irregular shape, as long as it can normally provide a deformable amount to facilitate the smooth spiral winding of the yoke portion 1.

[0033] If the tooth body group 21 and the tooth top group 22 are each stacked with the same individual, without shapes such as the tooth top matching portion 2121 and the tooth body matching portion 2211, or without long and short differences, that is, the splicing surfaces of the tooth body group 21 and the tooth top group 22 are both vertically flat, when spliced, it is not only difficult to align and position, but when fixed and connected, it generally needs to rely on welding means and needs to be welded for each individual tooth body and tooth top, which is very inconvenient to operate, and it is also difficult to ensure the flatness and strength of the connection.

[0034] The stator core in the embodiment is mainly composed of a plurality of the aforementioned stator punching sheets spirally wound and stacked up and down, the yoke portion 1, the tooth body group 21 and the tooth top group 22 are each stacked up and down and self-fixed, and the splicing surface of the stacked tooth body group 21 and the stacked tooth top group 22 is not a vertically flat surface but a surface with complementary concave-convex portions, that is, formed by splicing the first tooth body 211, the second tooth body 212 and the first tooth top 221 and the second tooth top 222. It is worth mentioning that for the separately punched yoke portion 1 and tooth body group 21, only the first tooth body 211 or only the second tooth body 212 can be provided on the same yoke portion 1, or both the first tooth body 211 and the second tooth body 212 are provided, and the spacing between adjacent first tooth bodies 211, the spacing between adjacent second tooth bodies 212 and the spacing between adjacent first tooth bodies 211 and second tooth bodies 212 are the same, because when the stator core is composed, a plurality of individual yoke portions 1 can be fixed and connected (such as welded) at the head and tail to be assembled. The stator core of the embodiment is finally applied to the motor structure, thereby obtaining a new type of motor with greatly improved performance.

[0035] Those skilled in the art will understand that the embodiments of the application shown in the above description and the accompanying drawings are only examples and do not limit the application. The purpose of the application has been fully and effectively achieved. The function and structural principle of the application has been shown and described in the embodiments, and the implementation of the application can be any modification or modification without departing from the principle.

Claims

1. A split-assembly spiral-wound stator lamination, comprising a yoke (1) and a tooth set (2), wherein the tooth set (2) is evenly spaced on the outer side of the yoke (1) and forms a wire groove (3) for winding, characterized in that: The tooth assembly (2) includes a paired tooth body assembly (21) and a tooth tip assembly (22). The yoke (1) is integrally formed with the tooth body assembly (21). The yoke (1) and the tooth body assembly (21) are used to spirally wind together and stacked vertically. The tooth tip assembly (22) is independent of the yoke (1) and the tooth body assembly (21). The tooth tip assembly (22) is used to stack vertically and to be spliced ​​and fixed with the tooth body assembly (21) that is also stacked. The tooth body assembly (21) includes a first tooth body (211) and a second tooth body (212). The second tooth body (212) includes a main body portion that overlaps with the first tooth body (211) and a tooth tip mating portion (2121) additionally provided relative to the first tooth body (211). The same yoke (1) may only have the first tooth body (211), only have the second tooth body (212), or both the first tooth body (211) and the second tooth body (212) are provided. The interval between adjacent first tooth bodies (211), the interval between adjacent second tooth bodies (212), and the interval between adjacent first tooth bodies (211) and second tooth bodies (212) are the same. The tooth tip assembly (22) includes a first tooth tip (221) and a second tooth tip (222). The first tooth tip (221) includes a main body portion that overlaps with the second tooth tip (222) and a tooth body mating portion (2211) that is additionally present relative to the second tooth tip (222). The first tooth tip (221) and the first tooth body (211) are assembled into a single complete tooth, and the second tooth tip (222) and the second tooth body (212) are assembled into a single complete tooth. The overall shape of the second tooth tip (222) and the tooth tip mating portion (2121) is the same as that of the first tooth tip (221). The tooth body assembly (21) forms alternating portions consisting of a plurality of first tooth bodies (211) stacked together and a plurality of second tooth bodies (212) stacked together, and the tooth tip assembly (22) forms alternating portions consisting of a plurality of first tooth tips (221) stacked together and a plurality of second tooth tips (222) stacked together.

2. The separately assembled spiral wound stator lamination according to claim 1, characterized in that: The tooth tip mating part (2121) and the tooth body mating part (2211) are provided with mutual fixing parts (a), which are used to connect and fix the second tooth body (212) stacked on top of each other with the first tooth tip (221).

3. The separately assembled spiral-wound stator lamination according to claim 1, characterized in that: Both the first tooth tip (221) and the second tooth tip (222) are provided with a tooth tip self-fixing part (b), which is used to connect and fix the stacked first tooth tip (221) or the stacked second tooth tip (222) to each other.

4. The separately assembled spiral wound stator lamination according to claim 1, characterized in that: Both the first tooth body (211) and the second tooth body (212) are provided with a tooth body self-fixing part (c), which is used to connect and fix the first tooth body (211) or the second tooth body (212) stacked on top of each other.

5. A separately assembled spiral wound stator lamination according to claim 1, characterized in that: The yoke (1) is provided with a yoke self-fixing part (d), which is used to connect and fix the stacked yokes (1) to each other.

6. A separately assembled spiral wound stator lamination according to claim 1, characterized in that: The yoke (1) has a winding process groove (e) on its inner circumference aligned with each tooth in the tooth assembly (21).

7. A stator core, characterized in that: It is mainly composed of several stator laminations as described in any one of claims 1 to 6, which are spirally wound and stacked one on the other.

8. A stator core according to claim 7, characterized in that: The yoke (1), the tooth body assembly (21), and the tooth tip assembly (22) are stacked and fixed one on top of the other. The mating surfaces of the stacked tooth body assembly (21) and the stacked tooth tip assembly (22) are not vertical and flat but have complementary concave and convex parts. The tooth body assembly (21) and the tooth tip assembly (22) are fixed to each other through the complementary concave and convex parts.

9. An electric motor, characterized in that: Includes the stator core as described in any one of claims 7 or 8.

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