Lamination and stator core
By setting spiral oil holes on the stator core laminations and using staggered stacking to form multiple oil cooling channels, the problem of poor lamination versatility is solved, the cooling structure is simplified, the motor cost and size are reduced, and the cooling efficiency is improved.
Patent Information
- Application Number
- CN202511499105.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2025-12-23
AI Technical Summary
The existing stator core laminations have poor versatility, resulting in complex and costly cooling structures. Traditional oil injection ring cooling methods increase the manufacturing cost and size of the motor.
A stack of plates is designed with uniformly distributed spiral oil holes on them, and different types of oil cooling channels, including axial and inclined channels, are formed by the misalignment and corresponding stacking of the plates to improve versatility.
This improved the versatility of the stator core, simplified the cooling structure, reduced the manufacturing cost and size of the motor, and improved cooling efficiency.
Smart Images
Figure CN121192971A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor cooling technology, and in particular to a laminated stator core. Background Technology
[0002] During motor operation, the windings generate a large amount of heat due to energization, requiring effective cooling measures to ensure motor performance and reliability. Traditional cooling methods often rely on oil spray rings located at both ends of the stator core to dissipate heat by spraying cooling oil onto the winding ends. However, this method has a complex structure, increasing the manufacturing cost and overall size of the motor.
[0003] Existing technology proposes a cooling scheme that eliminates the need for an oil spray ring. This scheme involves setting an oil inlet channel in the middle of the stator core and an oil spray channel that runs through both ends of the core. Cooling oil flows into the stator core from the oil inlet channel and is sprayed onto the winding sections at both ends through the oil spray channel, thereby achieving heat dissipation of the windings.
[0004] The stator core consists of several stacked laminations. Due to the differences in the structure of the oil injection channels, various laminations with different hole and slot structures are required, resulting in poor versatility of the laminations. Summary of the Invention
[0005] Based on this, the present invention provides a laminated stator core to improve the problem of poor versatility of existing laminated stators.
[0006] According to an embodiment of the present invention, a first aspect provides a laminate, wherein a plurality of oil holes are provided on the laminate through its two end faces, the oil holes being uniformly distributed in a spiral shape in the circumference of the laminate, wherein the diameter of the oil holes is d, and the center distance from the center of the oil hole to the center of the spiral continuously changes from the starting point L1 to the ending point Ln, and the difference in the center distance between at least adjacent oil holes is less than the diameter d of the oil hole.
[0007] In some embodiments, at least the difference between the center distance L1 and the center distance Ln is greater than or equal to the diameter d of the oil hole.
[0008] In some embodiments, the inner edge of the stacked sheets is provided with a plurality of winding grooves along the circumferential direction, and the oil holes are provided corresponding to the winding grooves.
[0009] In some embodiments, the outer edge of the stacked sheets is provided with a notch for identification.
[0010] According to an embodiment of the present invention, a second aspect provides a stator core in which an oil cooling channel is provided, at least a portion of which is formed by the aforementioned laminations.
[0011] In some embodiments, the oil cooling channel includes at least one inclined channel formed by the staggered stacking of the laminations, wherein the later stacked laminations are stacked at least one oil hole position offset from the earlier stacked laminations.
[0012] In some embodiments, the first inclined channel and the second inclined channel have the same length and inclination angle but opposite inclination directions.
[0013] In some embodiments, the oil cooling channel includes at least one axial channel formed by correspondingly stacking the laminations, wherein the later-stacked laminations are stacked in correspondence with the oil holes of the earlier-stacked laminations.
[0014] In some embodiments, the oil cooling channel includes a first axial channel and a second axial channel, wherein the laminations in the first axial channel are stacked with the laminations in the second axial channel offset from each other by at least one of the oil holes, such that the first axial channel is closer to the central axis of the stator core than the second axial channel.
[0015] In some embodiments, the oil cooling channel includes a third axial channel and a fourth axial channel, wherein the laminations in the third axial channel are rotated 180° relative to the laminations in the fourth axial channel.
[0016] The laminations of the present invention can form axial channels by corresponding stacking, can form inclined channels by staggered stacking, and can form axial channels at different distances from the central axis of the stator core by a combination of stacking and staggered stacking. The laminations have good versatility. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the stacked wafer structure according to Embodiment 1 of this application; Figure 2 for Figure 2 Enlarged structural diagram at point A; Figure 3 These are schematic diagrams of the stator core structure in Examples 2 and 3; Figure 4 This is a schematic diagram of the structure of the oil cooling channel forming a spray area and a non-spray area according to one embodiment of this application; Figure 5 This is a schematic diagram of the structure in Example 2 where stacked plates are assembled to form an inclined channel; Figure 6 This is a schematic diagram of the stacked laminations in the first and second axial channels of Embodiment 3; Figure 7 This is a schematic diagram of the stator core structure in Example 4; Figure 8This is a schematic diagram of the stacked laminations in the third and fourth axial channels of Embodiment 4.
[0018] In the figure: lamination 10; oil hole 11; winding groove 12; notch 13; stator core 20; first inclined channel 21; second inclined channel 22; first axial channel 23; second axial channel 24; third inclined channel 25; third axial channel 26; fourth axial channel 27. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.
[0021] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0022] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a stacked sheet 10. The inner edge of the stacked sheet 10 is provided with a plurality of winding grooves 12 along the circumferential direction. The stacked sheet 10 is provided with a plurality of oil holes 11 penetrating its two end faces. The oil holes 11 are evenly distributed in a spiral shape in the circumferential direction of the stacked sheet 10. The diameter of the oil hole 11 is d. The center distance from the center of the oil hole 11 to the center of the spiral changes continuously from the starting point L1 to the ending point Ln. At least the center distance between adjacent oil holes 11 is less than the diameter d of the oil hole 11.
[0023] In other words, in this embodiment, n oil holes 11 are arranged sequentially along a spiral path on the stack 10. The oil holes 11 are labeled sequentially according to the direction of the spiral path, with the oil hole 11 at the starting point of the spiral being oil hole 1 and the oil hole 11 at the ending point of the spiral being oil hole n. The line connecting the centers of the oil holes 11 forms a spiral trajectory. This spiral rotates around the center of the stack 10 for one revolution. The center distance between the center of the oil hole 11 at the starting point of the spiral and the center of the spiral is L1, and the center distance between the center of the oil hole 11 at the ending point of the spiral and the center of the spiral is Ln. The difference in the center distance between at least adjacent oil holes 11 is less than the diameter d of the oil hole 11, such as |L1-L2|<d.
[0024] In this embodiment, the stacked plate 10 can be configured to stack the oil holes 11 in a corresponding manner to form an axial channel, or the oil holes 11 can be stacked in a staggered manner with at least one oil hole 11 offset to form an inclined channel. Different channels can be formed by combining corresponding stacking and staggered stacking. The stacked plate 10 has a simple structure and strong versatility.
[0025] In this embodiment, the difference between the center distance L1 at the starting point and the center distance Ln at the ending point is preferably greater than or equal to the diameter d of the oil hole 11, i.e., |L1-Ln|≥d. In this embodiment, after the stacked sheets 10 are misaligned, some oil holes 11 form connected channels, while others form blocked channels, to meet different usage requirements. In some embodiments, |L1-Ln|<d may also be chosen, so that after the stacked sheets 10 are misaligned, all oil holes 11 form connected channels.
[0026] In this embodiment, the oil hole 11 is correspondingly provided with the winding groove 12, so that the channel formed by the oil hole 11 corresponds to the cooling winding. In this embodiment, the outer edge of the lamination 10 is provided with a notch 13 for marking, which facilitates the identification of the stacking angle of the lamination 10.
[0027] Example 2 like Figure 3 and Figure 4 As shown, this embodiment provides a stator core 20, in which an oil cooling channel is provided. The oil cooling channel forms a fan-shaped spray area on the upper part of the stator core 20 and a fan-shaped non-spray area on the lower part of the stator core 20. Since the cooling oil sprayed onto the upper winding part can drip down to the lower winding part under the action of gravity, it is not necessary to make the spray area completely cover the circumference of the stator core 20, which can improve the utilization rate of the cooling oil.
[0028] The oil cooling channel in this embodiment includes at least one inclined channel to guide the cooling oil to flow obliquely. The inclined channel in this embodiment is formed by the aforementioned staggered stacking of laminations 10. The later stacked laminations 10 are stacked at least one oil hole 11 offset from the earlier stacked laminations 10, so that the oil holes 11 at the starting and ending regions of the spiral form blocked channels, while the remaining oil holes 11 form connected channels. These connected channels are located in the aforementioned spray area, and the blocked channels are located in the aforementioned non-spray area.
[0029] Specifically, adjacent oil holes 1 and 2 have an intersecting area after being stacked in a staggered manner, forming a connected channel. Since the difference between the center distance L1 at the starting point and the center distance Ln at the ending point is greater than or equal to the diameter of oil hole 11, oil holes 1 and 2 will not have an intersecting area after being stacked in a staggered manner, forming a blocked channel.
[0030] See details Figure 5 In this embodiment, stacked plates I, II, and III are stacked with one oil hole 11 offset. Oil hole 2 of stacked plate II corresponds to oil hole 1 of stacked plate I, and in this case, oil hole 1 of stacked plate II corresponds to oil hole n of stacked plate I. Oil hole 3 of stacked plate III corresponds to oil hole 2 of stacked plate II, and oil hole 3 of stacked plate III corresponds to oil hole 1 of stacked plate I, and in this case, oil hole 1 of stacked plate III corresponds to oil hole n of stacked plate II, and oil hole 1 of stacked plate III corresponds to oil hole n-1 of stacked plate I. Some embodiments may also stack plates with two or more oil holes 11 offset as needed. Similarly, when two oil holes 11 need to be offset during stacking, at least |L1-L3| < d must be ensured.
[0031] Because the n oil holes 11 on the stack 10 are distributed along a spiral path, adjacent oil holes 11 form a connected channel after being stacked in a staggered manner; oil hole 1 and oil hole n form a blocked channel after being stacked in a staggered manner. Similarly, when m stacks 10 are stacked, there will be m-1 blocked channels, meaning the channel formed from oil hole 1 to oil hole m-1 is blocked, and the corresponding channel formed from oil hole nm-1 to oil hole n is blocked. By reasonably setting the number of stacks 10, the number of connected channels and the number of blocked channels can be controlled, thereby controlling the ratio of the central angle between the spray area and the non-spray area. The stacks 10 can not only form inclined channels when stacked, but also correspondingly form connected and blocked channels to meet the needs of both the spray area and the non-spray area.
[0032] It should be noted that the number of segments in the diagonal channel can be set according to requirements, such as... Figure 3The stator core 20 has an oil cooling channel comprising two inclined channels. After entering the stator core 20, the cooling oil first passes through a first inclined channel 21 and a first axial channel 23, spraying the windings on one end face of the stator core 20. Secondly, it passes through a second axial channel 24 and a second inclined channel 22, spraying the windings on the other end face of the stator core 20. The first inclined channel 21 and the second inclined channel 22 have the same length and inclination angle but opposite inclination directions, which balances the pressure difference between the channels and ensures uniform oil spray volume on both sides.
[0033] like Figure 7 The stator core 20 has an oil cooling channel including an inclined channel. After entering the stator core 20, the cooling oil first passes through the third axial channel 26 to spray the winding on one end face of the stator core 20, and then passes through the fourth axial channel 27 and the third inclined channel 25 to spray the winding on the other end face of the stator core 20.
[0034] Example 3 like Figure 3 and Figure 4 As shown, this embodiment provides a stator core 20, in which an oil cooling channel is provided. The oil cooling channel forms a fan-shaped spray area on the upper part of the stator core 20 and a fan-shaped non-spray area on the lower part of the stator core 20. The oil cooling channel includes at least one axial channel arranged along the axial direction, which is used to guide the cooling oil to flow along the axial direction of the stator core 20. In this embodiment, the axial channel is formed by correspondingly stacking the aforementioned laminations 10. The oil holes 11 of the later stacked laminations 10 are correspondingly stacked with those of the earlier stacked laminations 10, so that the formed axial channels all extend along the axial direction of the stator core 20.
[0035] The stator core 20 in this embodiment specifically includes two axial channels: a first axial channel 23 and a second axial channel 24. All the laminations 10 in the first axial channel 23 are stacked with all the laminations 10 in the second axial channel 24 at least one oil hole 11 offset from each other, so that the first axial channel 23 is closer to the central axis of the stator core 20 than the second axial channel 24.
[0036] See details Figure 6In the first axial channel 23 and the second axial channel 24, the oil holes 1, 2 to n of the laminations 10 are aligned one-to-one. All oil holes x of the laminations 10 in the first axial channel 23 correspond to all oil holes 1 of the laminations 10 in the second axial channel 24. The channel formed by oil holes x to n in the first axial channel 23 is closer to the central axis of the stator core 20 than the channel formed by oil holes 1 to nx-1 in the second axial channel 24; this portion is located in the spray area. The channel formed by oil holes 1 to x-1 in the first axial channel 23 is farther from the central axis of the stator core 20 than the channel formed by oil holes nx to n in the second axial channel 24; this portion is located in the non-spray area. The laminations 10 can not only form axial channels through stacking, but also correspondingly form connected channels and blocked channels to meet the needs of both the spray area and the non-spray area. It should be noted that since x needs to be calculated and determined according to actual needs, it involves many factors such as the number of grooves of the winding groove 12, the number of oil holes 11 n, the diameter of the oil holes 11 d, and the central angle α of the spray area, etc., so this embodiment will not elaborate on them.
[0037] Example 4 like Figure 7 As shown, this embodiment provides a stator core 20, in which an oil cooling channel is provided. The oil cooling channel specifically includes two axial channels, a third axial channel 26 and a fourth axial channel 27. In the third axial channel 26 and the fourth axial channel 27, the oil holes 11 of the later stacked laminations 10 are correspondingly stacked with the oil holes 11 of the earlier stacked laminations 10, so that the third axial channel 26 and the fourth axial channel 27 both extend along the axial direction of the stator core 20.
[0038] See details Figure 8 In the third axial channel 26 and the fourth axial channel 27, the oil holes 1, 2 to n of the laminations 10 are aligned one by one. Preferably, all the laminations 10 in the third axial channel 26 are rotated 180° relative to all the laminations 10 in the fourth axial channel 27. Due to the uneven thickness (same-plate difference) of the laminations 10 during the manufacturing process, if all the laminations 10 are stacked in the same direction, it will lead to cumulative errors, causing the stator core 20 to become an inclined wedge shape, which cannot meet the perpendicularity requirement between the end face of the stator core 20 and the inner hole. Therefore, in this embodiment, the laminations 10 in the third axial channel 26 are rotated 180° relative to the laminations 10 in the fourth axial channel 27 to avoid all the laminations 10 being installed in the same direction to eliminate the same-plate difference.
[0039] The notch 13 on the outer edge of the stacked piece 10 in this embodiment serves as an identifier. When the notch 13 of the stacked piece 10 in the third axial channel 26 and the notch 13 of the stacked piece 10 in the fourth axial channel 27 are on opposite sides, it can be ensured that all the stacked pieces 10 in the third axial channel 26 are rotated 180° relative to all the stacked pieces 10 in the fourth axial channel 27.
[0040] The laminations 10 of this embodiment can form axial channels by corresponding stacking, can form inclined channels by staggered stacking, and can form axial channels at different distances from the central axis of the stator core 20 by a combination of stacking and staggered stacking. The laminations 10 have good versatility.
[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A lamination characterized by: The lamination (10) is provided with a plurality of oil holes (11) penetrating through both end faces thereof, the oil holes (11) being uniformly distributed in a helical line shape in the circumferential direction of the lamination (10), the diameter of the oil hole (11) being d, the center distance from the center of the oil hole (11) to the center of the helix continuously varying from L1 at the start to Ln at the end, and the difference in the center distance of at least adjacent oil holes (11) being less than the diameter d of the oil hole.
2. The laminate of claim 1, wherein: The difference in the center distance L1 to Ln is greater than or equal to the diameter d of the oil hole (11).
3. The laminate of claim 2, wherein: The inner edge of the lamination (10) is provided with a plurality of winding grooves (12) in the circumferential direction, and the oil holes (11) are provided corresponding to the winding grooves (12).
4. The laminate of claim 2, wherein: The outer edge of the lamination (10) is provided with a notch (13) for identification.
5. A stator core in which an oil cooling passage is provided inside, characterized by: At least part of the oil cooling channel is formed by stacking the laminations (10) according to any one of claims 1 to 4.
6. The stator core of claim 5, characterized by: The oil cooling channel includes at least one inclined channel formed by misaligned stacking of the laminations (10), the lamination (10) stacked later being misaligned with the lamination (10) stacked earlier by at least one oil hole (11) position.
7. The stator core of claim 6, characterized by: The oil cooling channel includes a first inclined channel (21) and a second inclined channel (22), the lengths and inclination angles of the first inclined channel (21) and the second inclined channel (22) being the same and the inclination directions being opposite.
8. The stator core of claim 5, characterized by: The oil cooling channel includes at least one axial channel formed by corresponding stacking of the laminations (10), the lamination (10) stacked later being stacked corresponding to the oil hole (11) of the lamination (10) stacked earlier.
9. The stator core of claim 8, characterized by: The oil cooling channel includes a first axial channel (23) and a second axial channel (24), the laminations (10) in the first axial channel (23) being misaligned by at least one oil hole (11) with the laminations (10) in the second axial channel (24) as a whole, so that the first axial channel (23) is closer to the central axis of the stator core (20) than the second axial channel (24).
10. The stator core of claim 8, characterized by: The oil cooling channel includes a third axial channel (26) and a fourth axial channel (27), the laminations (10) in the third axial channel (26) being rotated by 180° as a whole compared to the laminations (10) in the fourth axial channel (27).