Stator core of oil-cooled motor
The segmented iron core design and the regular oil channel arrangement solve the problems of high cost and low cooling oil utilization in the oil-cooled motor stator structure, achieving the effects of low cost, simplified processing and reduced end winding temperature.
Patent Information
- Application Number
- CN202422935073.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the existing oil-cooled motor stator structure, the iron core design is complex, the cost is high, the fixation is difficult, and the cooling oil utilization rate is low, resulting in high end winding temperature and prone to thermal insulation problems.
The segmented core design is adopted. The middle core and the end oil-conducting core are formed by stacking multiple main core punching sheets. By regularly opening oil channels on the punching sheets, axial and circumferential cooling oil paths are formed, which reduces the number of punching sheets and simplifies the processing process.
The invention realizes low cost and simplified processing of the iron core, improves the utilization rate of the cooling oil, reduces the temperature of the end winding, and solves the thermal insulation problem.
Smart Images
Figure CN223451698U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor stator structure technical field especially, it relates to an oil cooling motor stator core. BACKGROUND
[0002] In view of the high power density requirement of new energy vehicle system to motor, the current motor design is increasingly high heat load; the winding temperature of traditional water-cooled motor is high, especially the end winding, because the cooling medium is air in the motor, the heat transfer efficiency is low, and the end winding temperature is often extremely high, so the end winding is also the weakest place of the line thermal insulation problem, so the recently developed oil-cooled motor, relying on the excellent insulation characteristics of cooling oil, directly cools the end winding, so the utilization rate of cooling oil sprayed to the end winding is very critical.
[0003] The existing oil-cooled motor stator structure is as follows: the core is used as an end oil guide part, the oil groove along the lower half circle in the gravity direction is removed, only the upper oil outlet is reserved, and an end oil guide part is arranged at the position of the end oil outlet. UTILITY MODEL CONTENTS
[0004] In order to solve the above technical problems, the purpose of the utility model is to provide an oil-cooled motor stator core, which has fewer types of punching sheets, is easy to assemble and has low cost.
[0005] In order to achieve the above utility model purposes, the utility model adopts the following technical solutions:
[0006] The oil-cooled motor stator core comprises an intermediate segment core and end oil guide cores arranged at both ends of the intermediate segment core, the end oil guide cores are formed by stacking a plurality of main core punching sheets, notches are arranged on the outer sides of the main core punching sheets, and the notches of the main core punching sheets are offset from each other so that part of the notches are closed; the intermediate segment core is also formed by stacking a plurality of main core punching sheets; the notches on the main core punching sheets of the intermediate segment core are aligned, and the notches on the main core punching sheets of the end oil guide cores are aligned to form an axial cooling oil path.
[0007] As a preferred solution, the intermediate segment core further comprises a plurality of circumferential oil channel punching sheets, the plurality of main core punching sheets and the plurality of circumferential oil channel punching sheets are alternately stacked, the outer diameter of the circumferential oil channel punching sheet is smaller than the outer diameter of the main core punching sheet, so that one or a plurality of adjacent circumferential oil channel punching sheets and adjacent main core punching sheets form a circumferential cooling oil path.
[0008] As a preferred scheme, the recesses on the outer side of the main core punching sheet in a sector area with a central angle of 120-150° are circumferential upper end oil passage holes, the recesses on the remaining area of the outer side of the main core punching sheet are circumferential lower end oil passage holes, and the density of the circumferential lower end oil passage holes is less than that of the circumferential upper end oil passage holes.
[0009] As a preferred scheme, the recesses on the outer side of the main core punching sheet in a sector area with a central angle of 120-150° are circumferential upper end oil passage holes, the recesses on the remaining area of the outer side of the main core punching sheet are circumferential lower end oil passage holes, and the density of the circumferential lower end oil passage holes is less than that of the circumferential upper end oil passage holes.
[0010] As a preferred scheme, the recesses on the outer side of the main core punching sheet in a sector area with a central angle of 120-150° are circumferential upper end oil passage holes, the recesses on the remaining area of the outer side of the main core punching sheet are circumferential lower end oil passage holes, and the density of the circumferential lower end oil passage holes is less than that of the circumferential upper end oil passage holes.
[0011] As a preferred scheme, the recesses on the outer side of the main core punching sheet in a sector area with a central angle of 120-150° are circumferential upper end oil passage holes, the recesses on the remaining area of the outer side of the main core punching sheet are circumferential lower end oil passage holes, and the density of the circumferential lower end oil passage holes is less than that of the circumferential upper end oil passage holes.
[0012] As a preferred scheme, the recesses on the outer side of the main core punching sheet in a sector area with a central angle of 120-150° are circumferential upper end oil passage holes, the recesses on the remaining area of the outer side of the main core punching sheet are circumferential lower end oil passage holes, and the density of the circumferential lower end oil passage holes is less than that of the circumferential upper end oil passage holes.
[0013] Compared with the prior art, the utility model has the advantages that:
[0014] The utility model divides the iron core into three sections, and the oil passage is regularly arranged on the stator core punching sheet, so that the same punching sheet, i.e. the stator core of the intermediate section axial oil path, can form the end oil guide core with only the upper half of the gravity direction being conducted through the rotation and superposition, and the whole iron core is simple in machining and low in cost. BRIEF DESCRIPTION OF DRAWINGS
[0015] The drawings accompanying the specification integrated into this application serve to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute limitations to the present application.
[0016] Figure 1 It is the whole structure schematic diagram of the utility model;
[0017] Figure 2 And Figure 3 It is the structure schematic diagram of different angle of the end oil guide core of the utility model;
[0018] Figure 4 It is the structure schematic diagram of the main core punching sheet of the utility model;
[0019] Figure 5 is another main iron core punching piece structure schematic view of the utility model;
[0020] Figure 6 is another end oil guide iron core structure schematic view of the utility model;
[0021] Figure 7 is the third main iron core punching piece structure schematic view of the utility model;
[0022] Figure 8 is the third end oil guide iron core structure schematic view of the utility model;
[0023] Figure 9 is the intermediate section iron core structure schematic view of the utility model;
[0024] Figure 10 is the circumferential oil channel punching piece structure schematic view of the utility model; DETAILED DESCRIPTION
[0025] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0026] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or combination thereof.
[0027] In addition, in the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.
[0029] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0032] like Figure 1 As shown, the oil-cooled motor stator core includes a middle section core 3 and end oil-conducting cores 2 arranged at both ends of the middle section core 3, the end oil-conducting core 2 is formed by stacking multiple main core punchings 2-1, the outer side of the main core punchings 2-1 is provided with notches, and the multiple main core punchings 2-1 are deflected from each other so that some of the notches are closed; the middle section core 3 is also formed by stacking multiple main core punchings 2-1; the notches on the multiple main core punchings 2-1 of the middle section core 3 are aligned, and are aligned with the notches on the main core punchings 2-1 on the end oil-conducting core 2 to form an axial cooling oil path.
[0033] like Figures 2 to 4As shown, the end oil-conducting iron core 2 is formed by stacking multiple main iron core punchings 2-1. Several circumferential upper oil holes 2-1-1 are evenly distributed on the outside of the main iron core punchings 2-1 within a sector-shaped area with a central angle of 120° to 150°. Circumferential lower oil holes 2-1-2 are evenly distributed on the remaining area outside the main iron core punchings 2-1, and the density of the circumferential lower oil holes 2-1-2 is less than that of the circumferential upper oil holes 2-1-1. Between every two winding slots 4 is a stator tooth. Within the sector-shaped area with a central angle of 120° to 150°, one circumferential upper oil hole 2-1-1 is provided for each stator tooth. Within the remaining circumferential angle area outside the main iron core punchings 2-1, n circumferential lower oil holes 2-1-2 are evenly distributed every several stator teeth.
[0034] As a further optimized solution, the end oil-conducting core 2 is formed by rotating n+1 stacks of main core punching sheets 2-1 in sequence through angles a, 2a, 3a...na based on the middle section core 3, where a is the angle formed by two adjacent stator teeth, and most of the circumferential upper end oil holes 2-1-1 are conductive, and all of the circumferential lower end oil holes 2-1-2 are closed.
[0035] like Figure 5 and Figure 6 As shown, the circumferential lower end oil holes 2-1-2 on the main core punching sheet 2-1 can be arranged in groups of two, and the spacing is relatively large, with a total of 7 groups. The three main core punching sheets 2-1 are deflected from each other to form the end oil guide core 2; Figure 7 and Figure 8 As shown, the circumferential lower end oil holes 2-1-2 on the main core punching sheet 2-1 can be arranged in a group of three, and the spacing is moderate, with a total of 7 groups. The four main core punching sheets 2-1 are deflected from each other to form the end oil guide core 2; the end oil guide core 2 has a diverse structure. The number of main core punching sheets 2-1, and the number and spacing of the circumferential upper end oil holes 2-1-1 and the circumferential lower end oil holes 2-1-2 on the main core punching sheet 2-1 are designed according to the specific motor performance.
[0036] like Figure 9 and Figure 10 As shown, the middle section core 3 includes a main core punching sheet 2-1 and a circumferential oil channel punching sheet 3-1, and a plurality of main core punching sheets 2-1 and a plurality of circumferential oil channel punching sheets 3-1 are alternately stacked to form the middle section core 3; the circumferential lower end oil through holes 2-1-2 on the plurality of main core punching sheets 2-1 of the middle section core 3 are aligned with each other, and the circumferential lower end oil through holes 2-1-2 on the plurality of main core punching sheets 2-1 are also aligned with each other; the outer diameter of the circumferential oil channel punching sheet 3-1 is smaller than the outer diameter of the main core punching sheet 2-1, so that one or multiple adjacent circumferential oil channel punching sheets 3-1 form a circumferential cooling oil path with the adjacent main core punching sheets 2-1.
[0037] The iron core is divided into two parts, i.e. the middle section iron core and the end oil guide iron core, the middle section iron core is formed by main iron core punching sheet without angle rotation, all oil holes are aligned and laminated, and cooperates with another punching sheet (circumferential oil channel punching sheet 3-1) with smaller outer diameter than the punching sheet, to form the middle section iron core, and all oil holes are communicated; the end oil guide iron core is also formed by main iron core punching sheet n+1 section rotating circumferentially by a corresponding angle a of a tooth (assuming the number of slots is S, and the corresponding angle of a tooth is a=360 / S), it should be noted that the rotation angle can be a, 2a, 3a…na based on the first section iron core, and the order can be changed.
[0038] The utility model discloses a design of iron core punching sheet, which can be used as middle section oil guide iron core and end oil guide section iron core after staggered lamination, thereby reducing the types of punching sheet and the cost of grinding tool.
[0039] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0040] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled in the art can change, modify, replace and modify the above embodiments in the scope of the utility model without departing from the principles and purposes of the utility model. Any simple modification, equivalent change and modification made according to the technical essence of the utility model to the above embodiments still belong to the scope of the technical scheme of the utility model.
Claims
1. Oil-cooled motor stator core, characterized by: The invention comprises a middle section iron core (3) and end oil-conducting iron cores (2) arranged at both ends of the middle section iron core (3); the end oil-conducting iron core (2) is formed by stacking a plurality of main iron core punching sheets (2-1); notches are provided on the outer sides of the main iron core punching sheets (2-1), and the plurality of main iron core punching sheets (2-1) are deflected relative to each other so that some of the notches are closed; the middle section iron core (3) is also formed by stacking a plurality of main iron core punching sheets (2-1); the notches on the plurality of main iron core punching sheets (2-1) of the middle section iron core (3) are aligned, and are aligned with the notches on the main iron core punching sheets (2-1) on the end oil-conducting iron core (2) to form an axial cooling oil path.
2. The oil-cooled motor stator core according to claim 1, characterized in that: The middle section iron core (3) further comprises a circumferential oil channel punching sheet (3-1), a plurality of main iron core punching sheets (2-1) and a plurality of circumferential oil channel punching sheets (3-1) are alternately stacked, and the outer diameter of the circumferential oil channel punching sheet (3-1) is smaller than the outer diameter of the main iron core punching sheet (2-1), so that one or a plurality of adjacent circumferential oil channel punching sheets (3-1) and adjacent main iron core punching sheets (2-1) form a circumferential cooling oil channel.
3. The oil-cooled motor stator core according to claim 1, characterized in that: Several notches in a sector-shaped area with a central angle of 120° to 150° on the outside of the main iron core punching sheet (2-1) are circumferential upper end oil through holes (2-1-1), and the notches in the remaining area on the outside of the main iron core punching sheet (2-1) are circumferential lower end oil through holes (2-1-2), and the density of the circumferential lower end oil through holes (2-1-2) is smaller than that of the circumferential upper end oil through holes (2-1-1).
4. The oil-cooled motor stator core according to claim 3, characterized in that: A stator tooth is located between every two winding slots (4); a circumferential upper end oil hole (2-1-1) is provided corresponding to each stator tooth in a sector-shaped area with a central angle of 120° to 150° on the outside of the main iron core punching sheet (2-1); and n circumferential lower end oil holes (2-1-2) are evenly provided every several stator teeth in the remaining circumferential angle areas on the outside of the main iron core punching sheet (2-1).
5. The oil-cooled motor stator core according to claim 3 or 4, characterized in that: The end oil-conducting iron core (2) is formed by rotating n+1 stacks of main iron core punching sheets (2-1) in sequence at corresponding angles based on the middle section iron core (3), so that most of the circumferential upper end oil through holes (2-1-1) are open and all of the circumferential lower end oil through holes (2-1-2) are closed.
6. The oil-cooled motor stator core according to claim 5, characterized in that: The end oil-conducting iron core (2) is formed by rotating n+1 stacks of main iron core punching sheets (2-1) sequentially through angles a, 2a, 3a...na based on the middle section iron core (3), wherein a is the angle formed by two adjacent stator teeth.
7. The oil-cooled motor stator core according to claim 1, characterized in that: The circumferential lower end oil through holes (2-1-2) on the plurality of main core punching sheets (2-1) of the middle section iron core (3) are aligned with each other, and the circumferential lower end oil through holes (2-1-2) on the plurality of main core punching sheets (2-1) are also aligned with each other.