Stator core and three-phase permanent magnet electric roller thereof

Abstract

The utility model relates to the technical field of stators, in particular to a stator core and a three-phase permanent magnet electric roller thereof, two ends of a stator body are respectively provided with coaxial first shaft holes, the first shaft holes are used for supporting and assembling with an intermediate shaft, and an air duct is formed between the peripheral surface of the stator body and the first shaft holes. The stator body is integrally formed, when the stator is used, original rib plate stacking and welding forming is changed into stator body integral forming, the overall strength of the stator body is improved, the streamline of the branch inner raceway is better, and the problems of cooling air stagnation and local overheating are avoided; the number of processing parts of a middle shaft hole is reduced, the production efficiency is improved, and the problems of low processing efficiency, poor overall strength and poor air duct streamline caused by stacking and welding of rib plates in the existing inner stator are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of stators, in particular to a stator iron core and a three-phase permanent magnet electric roller thereof. Background Art

[0002] The three-phase permanent magnet electric drum includes an inner stator and an outer rotor matched with the inner stator, wherein the structure of the existing inner stator is mainly achieved by stacking rib plates one by one and welding them together along the axial direction of the shaft, which makes the inner stator processing efficiency low and the overall strength of the inner stator structure poor. At the same time, an air guide tube for heat dissipation is welded on the outer periphery of the inner stator, and the overall installation process of the inner stator is complicated. This processing technology makes the air duct streamline between the stator and the air guide tube poor, resulting in resistance to the circulation of cooling air or stagnation, and at the same time causes local overheating at a certain point in the air duct. When the mounting hole in the middle of the inner stator is assembled with the intermediate shaft, since the holes on each rib plate are in contact with the intermediate shaft, the deeper the intermediate shaft is inserted into the mounting hole, the more difficult it is to insert the intermediate shaft, resulting in low installation efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the problem that the existing inner stator is welded by stacking rib plates, resulting in low processing efficiency, poor overall strength and poor air duct streamline, a stator core and a three-phase permanent magnet electric drum thereof are provided.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a stator core, wherein the two ends of the stator body are respectively provided with coaxial first axial holes, the first axial holes are used for assembly with the intermediate shaft support, an air duct is formed between the outer peripheral surface of the stator body and the first axial holes, and the stator body is integrally formed. Compared with the prior art, this solution improves the overall strength of the stator body by changing the original positioning body from the rib plate stacking and welding forming to the stator body integrally formed, and also makes the streamline of the inner raceway better, avoiding the problems of cooling air stagnation and local overheating, and the first axial holes at both ends are assembled with the intermediate shaft support, reducing the processing parts of the intermediate shaft hole, and improving production efficiency.

[0005] Due to the existing stacked welding of the stator core, the middle shaft hole will be very long. During assembly, the contact surface between the shaft hole and the intermediate shaft will gradually increase, so that the deeper the intermediate shaft is inserted into the shaft hole, the more difficult it is to insert the intermediate shaft, resulting in low installation efficiency. In order to solve this problem, some preferred embodiments are that there is a gap between the portion between the first shaft holes at both ends of the stator body and the intermediate shaft. By providing a gap between the middle portion of the first shaft holes at both ends of the stator body and the intermediate shaft, there is a vacant portion between the intermediate shaft and the stator body, which can reduce the processing steps and improve the production efficiency, and can also facilitate the installation of the intermediate shaft and the stator body, thereby improving the installation efficiency.

[0006] In order to realize an integrally formed stator body, some preferred embodiments include an air guide cylinder, an outer shell, and a hollow shaft that are sequentially sleeved from the outside to the inside, the air duct is arranged between the air guide cylinder and the outer shell, and a cavity is provided between the outer shell and the hollow shaft. The air guide cylinder, the outer shell, and the hollow shaft that are sequentially sleeved are combined to form the stator body.

[0007] In order to make the space between the middle part of the first shaft holes at both ends and the intermediate shaft empty, in some preferred embodiments, the first shaft holes are respectively arranged at both ends of the hollow shaft, and the hollow shaft is provided with a second shaft hole, the second shaft hole is located between the first shaft holes at both ends, and the diameter of the second shaft hole is larger than the diameter of the first shaft hole. By making the diameter of the second shaft hole larger than the diameter of the first shaft hole, when the intermediate shaft is installed, the second shaft hole does not contact the intermediate shaft, and a gap is generated between the two, so that the space between the intermediate shaft and the first shaft holes at both ends is empty, which facilitates the installation of the intermediate shaft and the stator body and improves the installation efficiency.

[0008] In order to reduce the weight of the stator body, in some preferred embodiments, a first weight-reducing hole is provided on the inner peripheral wall of the second shaft hole. By providing the weight-reducing hole in the second shaft hole, the weight of the stator body is reduced.

[0009] In order to ensure the connection strength between the outer shell and the intermediate shaft, in some preferred embodiments, a rib plate is provided in the cavity, one end of the rib plate is provided on the outer shell, and the other end of the rib plate is provided on the hollow shaft. The outer shell and the hollow shaft are connected respectively at both ends of the rib plate to increase the connection strength between the two.

[0010] In order to reduce the overall weight of the stator body, in some preferred embodiments, the rib plate is provided with a second weight-reducing hole. By providing the second weight-reducing hole on the rib plate, the overall weight of the stator body is reduced.

[0011] In order to facilitate the assembly of the first shaft hole and the intermediate shaft, in some preferred embodiments, at least one of the first shaft holes at both ends of the stator body is provided with a keyway, and the intermediate shaft and the first shaft hole are key-connected to fix the two to each other.

[0012] In order to realize the integral molding of the stator body, in some preferred embodiments, the stator body is integrally molded by casting. The integral molding of the stator body is realized by a casting process.

[0013] A three-phase permanent magnet electric drum is provided with the above-mentioned stator core.

[0014] The beneficial effects of the utility model are as follows: when the stator core and the three-phase permanent magnet electric drum of the utility model are in use, the original forming by stacking and welding of rib plates is changed to an integral forming of the stator body, thereby improving the overall strength of the stator body and making the streamline of the inner raceway better, avoiding the problems of cooling air stagnation and local overheating. The first shaft holes at both ends are supported and assembled with the intermediate shaft, reducing the processing parts of the intermediate shaft hole, improving production efficiency, and avoiding the problems of low processing efficiency, poor overall strength and poor air duct streamline caused by the existing inner stator being welded by stacking and welding of rib plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of Example 1 in the utility model;

[0017] Figure 2 This is the front view of Example 1 of the utility model;

[0018] Figure 3 It is a left side view of Example 1 of the utility model;

[0019] Figure 4 yes Figure 3 Middle AA section view;

[0020] Figure 5 yes Figure 4 Middle BB section view;

[0021] Figure 6 yes Figure 4 Middle CC section view;

[0022] Figure 7 It is a three-dimensional structural schematic diagram of Example 2 of the utility model;

[0023] Figure 8 This is a front view of Example 2 of the utility model;

[0024] Fig. 9 It is a left side view of Example 2 of the utility model;

[0025] Fig.10 yes Figure 8 Middle DD section view.

[0026] In the figure: 1. stator body, 2. air duct, 3. first shaft hole, 4. air guide tube, 5. outer shell, 6. hollow shaft, 7. cavity body, 8. second shaft hole, 9. first weight-reducing hole, 10. rib plate, 11. second weight-reducing hole, 12. keyway, 13. intermediate shaft. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the embodiments:

[0028] The present invention is not limited to the following specific implementations. A person skilled in the art can implement the present invention in various other specific implementations according to the content disclosed in the present invention, or any design structure and idea of ​​the present invention with simple changes or modifications shall fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0031] Example 1

[0032] like Figure 1-6 As shown, a stator core includes a stator body 1, on which an air duct 2 is formed, the air duct 2 is arranged axially along the stator body 1, and first axial holes 3 are provided at both ends of the stator body 1 along its axial direction. The first axial holes 3 at both ends are coaxially arranged, and the first axial holes 3 are used for supporting and assembling with the intermediate shaft 13. The air duct 2 is located between the outer peripheral surface of the stator body 1 and the first axial hole 3. The stator body 1 of this embodiment includes but is not limited to being formed by casting as a whole. In addition to being formed by casting as a whole, the stator body 1 can also be printed out by using existing 3D printing technology.

[0033] Furthermore, the stator body 1 includes an air guide tube 4, an outer shell 5 and a hollow shaft 6. The air guide tube 4, the outer shell 5 and the hollow shaft 6 are sequentially sleeved from the outside to the inside to form the stator body 1. The air duct 2 is located between the air guide tube 4 and the outer shell 5. There is a cavity 7 between the outer shell 5 and the hollow shaft 6. The cavity 7 can not only reduce the weight of the stator body 1, but also reduce the material used for casting the stator body 1. The first axial holes 3 are respectively opened at both ends of the hollow shaft 6, and the first axial holes 3 at both ends extend inward along the axial direction. The middle part of the hollow shaft 6 is opened with a second axial hole 8, and the second axial hole 8 is located between the first axial holes 3 at both ends. In this embodiment, the part between the first axial holes 3 at both ends of the stator body 1 is set as the second axial hole 8. The second axial hole 8 is coaxially arranged with the first axial hole 3. The diameter of the second axial hole 8 is larger than the diameter of the first axial hole 3, so that there is a gap between the part between the first axial holes 3 at both ends of the stator body 1 and the intermediate shaft 13.

[0034] A first weight-reducing hole 9 is arranged on the inner wall of the second shaft hole 8, a rib plate 10 is arranged in the hollow body 7, one end of the rib plate 10 is arranged on the outer shell 5, and the other end of the rib plate 10 is arranged on the hollow shaft 6, and a second weight-reducing hole 11 is opened on the rib plate 10.

[0035] In this embodiment, a keyway 12 is provided in one of the first axial holes 3 at both ends of the stator body 1. Of course, in addition to the keyway 12 at one end, keyways 12 can be provided in the first axial holes 3 at both ends according to usage requirements.

[0036] Example 2

[0037] Embodiment 2 is an application of embodiment 1, specifically: Figure 7-10 As shown, a three-phase permanent magnet electric drum includes a stator assembly, the stator assembly includes a stator core, the stator core includes a stator body 1 and a coil wound on the stator body 1, an intermediate shaft 13 is installed on the stator body 1, and the stator core in this embodiment adopts the above-mentioned stator core.

[0038] When the above-mentioned stator core and its three-phase permanent magnet electric drum are in use, due to the poor streamline of the air duct 2 formed by the existing welding, the cooling air becomes stagnant in the air duct 2, causing the stator body 1 to be locally overheated, resulting in poor heat dissipation effect of the stator body 1. Firstly, the use of an integrally formed stator body 1 can ensure that the streamline of the air duct 2 is better, the cooling air passes smoothly, and the heat dissipation of the stator body 1 is ensured. Secondly, the integrally formed stator body 1 is supported and assembled by the first axial holes 3 and the intermediate shaft 13 at both ends of the stator body 1. Compared with the axial holes formed by welding in the prior art, the first axial holes 3 at both ends are much shorter, and the second axial holes 8 in the first axial holes 3 at both ends do not contact the intermediate shaft 13 to form a void, which greatly reduces the contact surface between the stator body 1 and the intermediate shaft 13, is more convenient to process, is also convenient to install, does not cause installation jamming, improves installation efficiency, and improves the overall structure of the stator body 1.

[0039] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A stator core, comprising a stator body (1), characterized in that: The stator body (1) is provided with coaxial first axial holes (3) at both ends, the first axial holes (3) being used for supporting and assembling with the intermediate shaft (13), an air duct (2) being formed between the outer peripheral surface of the stator body (1) and the first axial holes (3), and the stator body (1) is integrally formed.

2. The stator core according to claim 1, characterized in that: There is a gap between the portion between the first shaft holes (3) at the two ends of the stator body (1) and the intermediate shaft (13).

3. The stator core according to any one of claims 1 or 2, characterized in that: The stator body (1) comprises an air guide cylinder (4), an outer shell (5) and a hollow shaft (6) which are sequentially sleeved from the outside to the inside, the air duct (2) is arranged between the air guide cylinder (4) and the outer shell (5), and a cavity (7) is provided between the outer shell (5) and the hollow shaft (6).

4. The stator core according to claim 3, characterized in that: The first axial holes (3) are respectively arranged at the two ends of the hollow shaft (6); a second axial hole (8) is arranged on the hollow shaft (6); the second axial hole (8) is located between the first axial holes (3) at the two ends; and the diameter of the second axial hole (8) is greater than the diameter of the first axial hole (3).

5. The stator core according to claim 4, characterized in that: A first weight-reducing hole (9) is provided on the inner peripheral wall of the second shaft hole (8).

6. The stator core according to claim 3, characterized in that: A rib plate (10) is arranged in the hollow body (7), one end of the rib plate (10) is arranged on the outer shell (5), and the other end of the rib plate (10) is arranged on the hollow shaft (6).

7. The stator core according to claim 6, characterized in that: The rib plate (10) is provided with a second weight-reducing hole (11).

8. The stator core according to claim 1, characterized in that: A keyway (12) is provided on at least one of the first axial holes (3) located at both ends of the stator body (1).

9. The stator core according to claim 1, characterized in that: The stator body (1) is integrally formed by casting.

10. A three-phase permanent magnet electric drum, characterized in that: A stator core as claimed in any one of claims 1 to 9 is installed.

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