Oil-cooled motor stator structure and stator main body

Abstract

The utility model relates to an oil cooling motor stator structure and a stator main body, the stator structure comprises a stator casing and a stator main body arranged in the stator casing, and the stator main body comprises a stator iron core and a stator wrapping sleeve; the stator core is formed by stacking a plurality of stator punching sheets, the outer edges of the stator punching sheets are provided with punching sheet convex teeth protruding along the radial direction, the stator core is wrapped by the stator wrapping sleeve, the side surface of the stator wrapping sleeve is provided with outer convex teeth and open holes for the punching sheet convex teeth to pass through, and the stator casing is in interference fit with the two convex teeth. Compared with the prior art, the utility model can solve the problem that the reliability is reduced due to the increase of the rotating speed of the motor.

Description

Technical Field

[0001] The utility model relates to a driving motor stator, in particular to an oil-cooling motor stator structure and a stator body. Background Art

[0002] With the rapid development of new energy electric vehicles, the requirements for motors are gradually increasing. The pursuit of high torque density and high power density also means high heat generation. Higher heat will damage the insulation of the motor and cause permanent demagnetization of the permanent magnet. Therefore, cooling the heating parts of the motor is conducive to ensuring the safe and stable operation of the motor. At present, similar oil-cooled motors mainly use spraying to cool the outer ring and end windings of the stator core. However, during the stacking process of the stator core, the offset of the stacking position will cause the unevenness of the stator circumferential surface, thereby affecting the flow area of ​​the cooling oil, and then affecting the uniformity of cooling. In addition, the oil spray holes formed on the end face of the stator core will increase the size and processing procedures of the core, reduce the strength of the stator core, and reduce the power density of the motor. In addition, when the motor is working, the stator will resonate and shake with the motor, generate greater noise, reduce the energy output of the motor, and shorten the service life of the motor. Increasing the stator stiffness can effectively reduce resonance and reduce noise, but the stator stiffness is subject to the material properties of the silicon steel sheet, so it is difficult to improve it from the material and structure itself. Currently, noise reduction mainly relies on optimizing electromagnetic force and wrapping noise reduction materials on the motor assembly, which will reduce motor performance while increasing installation space.

[0003] Therefore, how to provide a motor stator structure to improve the motor cooling effect, reduce resonance and noise, while reducing the motor size, simplifying the processing technology, and increasing the motor power density to increase the motor speed and power is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of the utility model is to provide an oil-cooled motor stator structure and a stator body, which can solve the problem of reduced reliability caused by increasing the motor speed.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An oil-cooled motor stator structure comprises a stator housing and a stator body arranged in the stator housing, wherein the stator body comprises a stator core and a stator wrapping sleeve;

[0007] The stator core is formed by stacking a plurality of stator punching sheets, and the outer edges of the stator punching sheets are provided with punching teeth protruding in the radial direction. The stator wrapping sleeve wraps the stator core inside, and the side surfaces of the stator wrapping sleeve are provided with external teeth and openings for the punching teeth to pass through, and the punching teeth and the external teeth are supported on the inner wall of the stator housing.

[0008] The stator wrapping sleeve comprises:

[0009] A first circular disk and a second circular disk are respectively attached to the two bottom surfaces of the stator core, and a circular sleeve is attached to the outer surface of the stator core. The circular sleeve is perpendicular to the first circular disk and the second circular disk, and the two ends are respectively connected to the first circular disk and the second circular disk, and the openings are all arranged on the circular sleeve.

[0010] The first annular disk and the second annular disk of the stator wrapping sleeve are provided with oil injection holes.

[0011] The punching plate convex teeth and the external convex teeth are distributed at intervals along the axial direction, and the punching plate convex teeth and the external convex teeth are interference fit with the stator housing.

[0012] The outer protruding teeth are solid structures.

[0013] The stator wrapping sleeve is made of plastic steel and is wrapped around the stator core by injection molding.

[0014] The stator punching sheets are connected by gluing.

[0015] The punching sheet convex teeth are provided with guide grooves.

[0016] The punching teeth on the stator punching sheet are evenly distributed so that a certain angle is formed between two adjacent convex teeth.

[0017] An oil-cooled motor stator body comprises a stator core and a stator wrapping sleeve;

[0018] The stator core is formed by stacking a plurality of stator punching sheets, the outer edges of the stator punching sheets are provided with punching teeth protruding in the radial direction, the stator wrapping sleeve wraps the stator core inside, and the side surfaces of the stator wrapping sleeve are provided with external protruding teeth and openings for the punching teeth to pass through.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. On the one hand, the use of the stator wrapping sleeve can improve the flow area of ​​the cooling oil on the circumferential surface of the stator, improve the uniformity of cooling, and at the same time reduce the size of the core punching sheet, reduce the size of the motor, and improve the power density of the motor. On the other hand, the convex teeth of the punching sheet pass through the stator wrapping sleeve and are directly supported on the inner side of the stator housing, which can avoid the problem of the stator wrapping sleeve breaking and clogging the oil hole due to excessive stress caused by interference fit when the motor rotates at high speed, thereby solving the problem of reduced reliability caused by increasing the motor speed.

[0021] 2. The existence of external convex teeth can better enhance damping and reduce stator resonance and noise.

[0022] 3. The unevenly distributed oil injection holes on the end face of the stator wrapping sleeve reasonably distribute the amount of cooling oil flowing into the high and low heat areas, thereby improving the cooling efficiency of the end face winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a schematic diagram of the structure of the stator wrapping sleeve;

[0025] Figure 3 It is a structural schematic diagram of a stator punching sheet;

[0026] Among them, 1. stator wrapping sleeve, 2. guide groove, 3. external convex teeth, 4. punching plate convex teeth, 5. oil injection hole, 6. stator core, 1-1. opening, 1-2. first circular ring disk, 1-3. second circular ring disk, 1-4. circular sleeve, 601. stator punching plate. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "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 invention 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 invention. In addition, the terms "proximal", "distal", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain 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 indirectly connected 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 according to specific circumstances.

[0032] An oil-cooled motor stator structure, such as Figures 1 to 3 As shown, it includes a stator housing and a stator body arranged in the stator housing, and the stator body includes a stator core 6 and a stator wrapping sleeve 1;

[0033] The stator core 6 is formed by stacking a plurality of stator punching sheets 601, and the outer edge of the stator punching sheet 601 is provided with a punching tooth 4 protruding in the radial direction. The stator wrapping sleeve 1 wraps the stator core 6 inside, and the side of the stator wrapping sleeve 1 is provided with an external tooth 3 and an opening 1-1 for the punching tooth 4 to pass through. The punching tooth 4 and the external tooth 3 are supported on the inner wall of the stator housing.

[0034] Therefore, on the one hand, the use of the stator wrapping sleeve 1 can improve the flow area of ​​the cooling oil on the circumferential surface of the stator and improve the uniformity of cooling. At the same time, it can reduce the size of the core punching sheet, reduce the size of the motor, and improve the power density of the motor. On the other hand, the punching sheet convex teeth 4 pass through the stator wrapping sleeve 1 and are directly supported on the inner side of the stator casing, which can improve the mechanical strength and avoid the problem of the stator wrapping sleeve 1 breaking and clogging the oil hole due to excessive stress caused by interference fit when the motor rotates at high speed, thereby solving the problem of reduced reliability caused by increasing the motor speed.

[0035] Generally, in almost all embodiments, the stator wrapping sleeve 1 comprises:

[0036] The first annular disk 1-2 and the second annular disk 1-3 are respectively attached to the two bottom surfaces of the stator core 6, and the circular sleeve 1-4 is attached to the outer side surface of the stator core 6. The circular sleeve 1-4 is perpendicular to the first annular disk 1-2 and the second annular disk 1-3, and the two ends are respectively connected to the first annular disk 1-2 and the second annular disk 1-3, and the openings 1-1 are all arranged on the circular sleeve 1-4.

[0037] In this way, the stator wrapping sleeve 1 can wrap the entire stator core 6 therein, thereby preventing the stator punching sheet 601 from moving axially due to the lack of wrapping on the bottom surface.

[0038] In addition, in most embodiments, the first annular disk 1-2 and the second annular disk 1-3 of the stator wrapping sleeve 1 are provided with oil injection holes 5. Generally, the oil injection holes 5 are distributed in a ring shape on the annular disk and are arranged near the outer edge of the annular disk, thereby ensuring that the cooling oil passes through the oil injection holes 5 to cool the end winding.

[0039] In this embodiment, the punching plate teeth 4 and the outer teeth 3 are spaced apart in the axial direction, so that the force balance between the stator and the housing can be ensured while the damping is improved, and the punching plate teeth 4 and the outer teeth 3 are interference fit with the stator housing.

[0040] In addition, in this embodiment, the outer protruding teeth 3 are solid structures so as to improve damping.

[0041] Generally, the material of the stator wrapping sleeve 1 is plastic steel, and is coated on the stator core 6 by injection molding. Similar to the prior art, the stator punching sheets 601 are connected by gluing.

[0042] Alternatively, the punching piece protruding teeth 4 are provided with guide grooves 2 to prevent errors during assembly and improve assembly efficiency.

[0043] In some embodiments, Figure 2 As shown, evenly distributed external protruding teeth 3 are formed on the circumferential surface of the stator wrapping sleeve 1, and the angle between adjacent external protruding teeth 3 is 13 degrees.

[0044] like Figure 3 As shown, the cross section of the stator punching sheet 601 is in the shape of a regular polygon; the punching teeth 4 arranged on the stator punching sheet 601 are distributed in pairs, and the angle between the two teeth in each pair of punching teeth 4 is 9.08 degrees, and a guide groove 2 is provided on any of the punching teeth 4. The material of the stator punching sheet 601 is the same as that of the existing stator punching sheet, which is a silicon steel sheet, and is formed by stamping. When the punching sheets are stacked, the stacking angle between two adjacent punching sheets is 13 degrees, and the stator punching sheets 601 are connected by gluing.

[0045] The assembly angle between the stator wrapping sleeve 1 and the stator core 6 is 37.5 degrees, so that the punching protruding teeth 4 on the stator punching sheet 601 and the outer protruding teeth 3 on the plastic wrapping sleeve 1 are spaced apart.

[0046] The specific use process and effect of the utility model are as follows: a plurality of stator punching sheets 601 are stacked according to the stacking angle to form a stator core 6, and the stator punching sheets 601 are connected by gluing. During the gluing process, the connection position will be offset, causing the unevenness of the cooling surface. The clamping force generated by the interference fit between the punching teeth 4 on the punching sheet and the stator housing can resist the motor torque, and also generate resonance and noise. The injection-molded stator wrapping sleeve 1 is coated on the stator core 6, which ensures the flatness of the stator circumferential surface, and the cooling oil is easier to flow on the stator circumferential surface, which better ensures the uniformity of cooling. The stator wrapping sleeve 1 does not wrap the punching teeth 4 on the stator punching sheet 601, mainly to ensure the rigid connection between the stator and the housing. The outer convex teeth 3 are formed on the stator wrapping sleeve 1, and are spaced apart from the punching teeth 4. Such a distribution ensures the force balance between the stator and the housing while improving the damping. The enhanced damping can effectively reduce resonance and noise. At the same time, the evenly distributed convex teeth will cause the formation of a stepped oil channel between the stator wrapping sleeve and the motor housing. During the cooling process, the stepped oil channel will cause the oil to convert from stratospheric heat exchange cooling to turbulent stirring cooling, which has higher cooling efficiency. It was found through actual measurements that the heat generation on the stator is unevenly distributed, so unevenly distributed oil spray holes 5 are formed on the end face of the stator wrapping sleeve 1 to ensure that the cooling oil cools the end winding through the oil holes. In areas with high heat generation, the denser the distribution of the oil spray holes 5, the denser the oil spray holes 5 can ensure that more cooling oil flows through the high heat area, thereby improving the cooling efficiency. Using the oil spray holes 5 on the end face of the stator wrapping sleeve 1 to replace the oil holes on the previous end face of the iron core can simplify the processing technology of the iron core, reduce the processing cost and improve the strength of the iron core. In addition, the use of the stator wrapping sleeve 1 reduces the radial size of the stator punching 601, reduces the size of the motor, increases the power density of the motor and saves assembly space.

Claims

1. An oil-cooled motor stator structure, comprising a stator housing and a stator body arranged in the stator housing, characterized in that: The stator body comprises a stator core (6) and a stator wrapping sleeve (1); The stator core (6) is formed by stacking a plurality of stator punching sheets (601), the outer edges of the stator punching sheets (601) are provided with punching sheet convex teeth (4) protruding in the radial direction, the stator wrapping sleeve (1) wraps the stator core (6) therein, and the side surfaces of the stator wrapping sleeve (1) are provided with external convex teeth (3) and openings (1-1) for the punching sheet convex teeth (4) to pass through, and the punching sheet convex teeth (4) and the external convex teeth (3) are supported on the inner wall of the stator housing.

2. The oil-cooled motor stator structure according to claim 1, characterized in that: The stator wrapping sleeve (1) comprises: A first annular disk (1-2) and a second annular disk (1-3) are respectively attached to the two bottom surfaces of the stator core (6), and a circular sleeve (1-4) is attached to the outer surface of the stator core (6), the circular sleeve (1-4) is perpendicular to the first annular disk (1-2) and the second annular disk (1-3), and the first annular disk (1-2) and the second annular disk (1-3) are respectively connected at two ends, and the openings (1-1) are all arranged on the circular sleeve (1-4).

3. The oil-cooled motor stator structure according to claim 2, characterized in that: The first annular disk (1-2) and the second annular disk (1-3) of the stator wrapping sleeve (1) are provided with oil injection holes (5).

4. The oil-cooled motor stator structure according to claim 1, characterized in that: The punching plate convex teeth (4) and the external convex teeth (3) are distributed at intervals along the axial direction, and the punching plate convex teeth (4) and the external convex teeth (3) are interference fit with the stator housing.

5. The oil-cooled motor stator structure according to claim 1, characterized in that: The outer protruding teeth (3) are of solid structure.

6. The oil-cooled motor stator structure according to claim 1, characterized in that: The stator wrapping sleeve (1) is made of plastic steel and is wrapped around the stator core (6) by injection molding.

7. The oil-cooled motor stator structure according to claim 1, characterized in that: The stator punching sheets (601) are connected by gluing.

8. The oil-cooled motor stator structure according to claim 1, characterized in that: The punching piece convex teeth (4) are provided with guide grooves (2).

9. The oil-cooled motor stator structure according to claim 1, characterized in that: The punching teeth (4) on the stator punching sheet (601) are evenly distributed so that a certain angle is formed between two adjacent punching teeth.

10. An oil-cooled motor stator body, characterized in that: It comprises a stator core (6) and a stator wrapping sleeve (1); The stator core (6) is formed by stacking a plurality of stator punching sheets (601), the outer edges of the stator punching sheets (601) are provided with punching sheet convex teeth (4) protruding in the radial direction, the stator wrapping sleeve (1) wraps the stator core (6) therein, and the side surfaces of the stator wrapping sleeve (1) are provided with external convex teeth (3) and openings (1-1) for the punching sheet convex teeth (4) to pass through.

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