Stator core, motor and vehicle

Abstract

The application provides a kind of stator core, motor and vehicle, it is related to vehicle parts technical field, iron core body and iron core end structure all include multiple stator lamination layers, each stator lamination layer is equipped with oil groove group and oil hole group, multiple oil grooves of oil groove group are spaced apart along the circumference of stator lamination layer, each stator lamination layer of iron core body is mutually superposed to make corresponding oil groove mutually communicate and form stator axial oil channel;Oil hole group includes multiple sub-oil hole groups that are rotationally staggered, multiple sub-oil holes of each sub-oil hole group are spaced apart along the circumference of stator lamination layer, and the distance between multiple sub-oil holes of the same sub-oil hole group and the central axis of stator lamination layer decreases in turn, each stator lamination layer of iron core end structure is rotationally superposed to make corresponding sub-oil hole mutually communicate and form stepped oil channel, and the stepped oil channel is communicated with the stator axial oil channel. A kind of stator lamination is used to realize centripetal oil cooling, and the cost of stator lamination mold is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle parts, in particular to a stator core, a motor and a vehicle. BACKGROUND

[0002] A driving motor for vehicle generates a large amount of heat during operation. In order to ensure the performance of the driving motor, it is usually necessary to cool it. Oil cooling has better heat dissipation effect compared with air cooling and water cooling, and is therefore widely used. The specific implementation of the existing oil cooling method usually has the following two ways: one is to provide an oil channel on the stator core, and to provide an oil ring or an oil pipe at the end of the core to guide the cooling oil in the oil channel to the end of the stator winding, so as to achieve oil cooling of the stator winding. Since additional parts such as oil ring and oil pipe are needed, the overall manufacturing cost of the motor is increased. The second way is to use multiple different stator laminations to form the stator core, so that the cooling oil inside the stator core can be sprayed to the end of the stator winding at a designed angle. Since there are multiple stator laminations, multiple sets of stator lamination molds need to be developed, which increases the overall manufacturing cost of the motor. SUMMARY

[0003] The present application aims to solve the technical problem of high cost of the existing motor oil cooling.

[0004] In a first aspect, the present application provides a stator core, comprising a core body and a core end structure arranged at the axial end of the core body, the core body and the core end structure each comprising a plurality of stator lamination layers, each of the stator lamination layers being uniformly divided into a plurality of regions along its circumferential direction, each of the stator lamination layers being provided with an oil groove group and an oil hole group, the plurality of oil grooves of the oil groove group being arranged at intervals along the circumferential direction of the stator lamination layer and being respectively located in the corresponding regions, the stator lamination layers of the core body being stacked on each other, and the plurality of oil grooves of each of the stator lamination layers being respectively connected in correspondence to form a plurality of stator axial oil channels; the oil hole group comprises a plurality of sub-oil hole groups arranged in rotationally staggered manner along the circumferential direction of the stator lamination layer, the plurality of sub-oil holes of each of the sub-oil hole groups being arranged at intervals along the circumferential direction of the stator lamination layer and being respectively located in the corresponding regions, and the distance of the plurality of sub-oil holes of the same sub-oil hole group from the central axis of the stator lamination layer decreases in turn, the stator lamination layers of the core end structure being stacked in rotation, and the plurality of stator lamination layers being connected in correspondence at least one sub-oil hole in each region to form a stepped oil channel, the distance of each sub-oil hole constituting the stepped oil channel from the central axis of the stator lamination layer decreases in turn from the direction close to the core body to the direction away from the core body, and the stepped oil channel is connected in correspondence with the stator axial oil channel; each of the stator lamination layers comprises one stator lamination or a plurality of stator laminations stacked in alignment, and the stator laminations adopted by the plurality of stator lamination layers of the core body and the core end structure are all the same.

[0005] Optionally, the number of oil grooves in each of the oil groove groups is equal to the number of sub-oil holes in each of the sub-oil hole groups, i.e., X; the number of stator lamination layers in the core end structure is N; the number of sub-oil hole groups in each of the stator lamination layers is the integer value of X / (X+N); and each of the sub-oil hole groups is offset by N regions of the stator lamination layers in the circumferential direction.

[0006] Optionally, the core end structure includes five stator lamination layers that are rotationally stacked; the oil hole groups include two sub-oil hole groups, i.e., a first sub-oil hole group and a second sub-oil hole group; each of the first sub-oil hole group and the second sub-oil hole group includes eight sub-oil holes; the second sub-oil hole group is offset by four regions of the stator lamination layers in the circumferential direction relative to the first sub-oil hole group; and the five stator lamination layers of the core end structure are rotationally offset by an angle equal to the angle spanned by two adjacent regions of the stator lamination layers.

[0007] Optionally, a plurality of oil groove groups and a plurality of oil hole groups are provided; and each of the oil groove groups and the oil hole groups is rotationally offset in the circumferential direction relative to one of the oil groove groups and the oil hole groups.

[0008] Optionally, the oil groove is configured to face away from the central axis of the stator lamination layer; and / or a plurality of winding grooves are provided in the circumferential direction of the stator lamination layer; the winding grooves are located on the side of the oil groove that is closer to the central axis of the stator lamination layer; and the angle spanned by two adjacent oil grooves of the oil groove group is an integer multiple of the angle spanned by two adjacent winding grooves.

[0009] Optionally, in the same region, a plurality of sub-oil holes are located on one side of the oil groove in the circumferential direction of the stator lamination layer.

[0010] Optionally, the axial ends of the core body are respectively provided with the core end structure; and the two ends of the stator axial oil channel are respectively in communication with the corresponding stepped oil channels of the two core end structures.

[0011] In a second aspect, the present application provides an electric machine including the stator core described above.

[0012] Optionally, the electric machine further includes a machine shell that is sleeved on the outside of the stator core; the machine shell is provided with an oil inlet; the inner wall of the machine shell is provided with an annular recess at a position corresponding to the stator core body, the annular recess extending in the circumferential direction of the machine shell; and the annular recess is in communication with the oil inlet and the stator axial oil channels of the stator core.

[0013] In a third aspect, the present application provides a vehicle comprising the motor.

[0014] The stator core, the motor and the vehicle of the present application have at least the following advantages compared with the prior art:

[0015] The core body and the core end structure of the stator core are formed by laminating and pressing a plurality of stator laminations, and each lamination layer comprises one or more stator laminations. The stator laminations used in the plurality of lamination layers of the core body and the core end structure are all the same, that is, the core body and the core end structure are formed by laminating and pressing the same kind of stator laminations. When the lamination layer is composed of a plurality of stator laminations, the stator laminations are arranged in alignment and lamination, which is equivalent to a thickened stator lamination.

[0016] In the case of forming the core body, the stator sheet layers of the core body are stacked in sequence and the four oil grooves of each stator sheet layer are communicated to form four stator axial oil channels; in the case of forming the core end structure, the stator sheet layers of the core end structure are stacked in rotation, and since the plurality of sub-oil holes of each sub-oil hole group of each stator sheet layer are arranged in the circumferential direction of the stator sheet layer and are located in the corresponding area respectively, each sub-oil hole group includes four sub-oil holes, and the distance of the four sub-oil holes of each sub-oil hole group from the center axis of the stator sheet layer decreases in sequence, that is, the plurality of sub-oil holes of each sub-oil hole group have a position difference in the radial direction of the stator sheet layer, and the four sub-oil holes of each sub-oil hole group in the calibration direction are a first sub-oil hole, a second sub-oil hole, a third sub-oil hole and a fourth sub-oil hole, when a plurality of stator sheet layers such as two stator sheet layers are placed in the order of a first stator sheet layer and a second stator sheet layer from bottom to top and stacked in rotation, the second sub-oil hole of the second stator sheet layer is located above the first sub-oil hole of the first stator sheet layer and the two are communicated to form a stepped oil channel, similarly, the third sub-oil hole of the second stator sheet layer is located above the second sub-oil hole of the first stator sheet layer and the two are communicated to form a stepped oil channel, the fourth sub-oil hole of the second stator sheet layer is located above the third sub-oil hole of the first stator sheet layer and the two are communicated to form a stepped oil channel, the above three stepped oil channels are communicated with three corresponding stator axial oil channels to spray the oil in the corresponding stator axial oil channel to the end of the stator winding at an inclined angle, and the first sub-oil hole of the second stator sheet layer is located above the fourth sub-oil hole of the first stator sheet layer, since the distance of the first sub-oil hole from the center axis of the stator sheet layer is larger than the distance of the fourth sub-oil hole from the center axis of the stator sheet layer, the second stator sheet layer blocks the fourth sub-oil hole of the first stator sheet layer and cannot guide the oil in the corresponding stator axial oil channel, that is, one sub-oil hole group can form three stepped oil channels to communicate with three stator axial oil channels after the two stator sheet layers are stacked in rotation, in order to realize the simultaneous conduction of the four stator axial oil channels, a plurality of sub-oil hole groups can be arranged in rotation offset in the circumferential direction of the stator sheet layer, such as two sub-oil hole groups, one of which can be offset by three areas relative to the other sub-oil hole group, so that each area has two sub-oil holes, the radial positions of the two sub-oil holes in each area are different and do not interfere with each other, after stacking in the above manner, six stepped oil channels can be formed to ensure that at least one stepped oil channel can be formed in each corresponding area of the two stator sheet layers, that is, at least one of the two sub-oil holes in each area of each stator sheet layer is communicated to form a stepped oil channel, so that the oil in each stator axial oil channel can be inclined to the end of the stator winding.And when the stator end structure is assembled with the stator core body, the distance between each sub-oil hole of the stepped oil channel and the center axis of the stator lamination layer is gradually reduced from the direction close to the core body to the direction away from the core body, and the stepped oil channel is inclined to the center axis of the stator winding, so that the centripetal spray of the stator winding is realized. In summary, the stator core of the present application can form a multi-path oil channel for spraying the stator winding, and the stator lamination layer of the core body and the stator lamination layer of the core end structure of the stator core are both composed of one or more stator laminations, that is, the entire stator core is composed of the same stator lamination, without the need to develop multiple sets of stator lamination molds, and without the need for additional oil rings, oil pipes and other parts, and without the need to develop multiple sets of stator lamination molds, thereby reducing the overall manufacturing cost of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a cross-sectional view of the motor of the embodiment of the present application;

[0018] Figure 2 is a cross-sectional view of half of the motor of the embodiment of the present application, with the center axis of the stator core as the symmetrical division line;

[0019] Figure 3 is Figure 2 is an enlarged schematic view of point A, wherein the arrows indicate the flow direction of the oil;

[0020] Figure 4 is a structural schematic view of the outer peripheral wall of the stator core of the embodiment of the present application, wherein the arrows indicate the flow direction of the oil;

[0021] Figure 5 is a structural schematic view of the stator lamination layer of the embodiment of the present application, with one oil groove set and one oil hole set arranged on the stator lamination layer;

[0022] Figure 6 is a structural schematic view of the stator lamination layer of the embodiment of the present application, with two oil groove sets and two oil hole sets arranged on the stator lamination layer.

[0023] BRIEF DESCRIPTION OF DRAWINGS:

[0024] 1, core body; 11, stator axial oil channel; 2, core end structure; 21, stepped oil channel; 3, stator lamination layer; 31, oil groove group; 311, oil groove; 32, sub-oil hole group; 321, sub-oil hole; 3211, No. 1 sub-oil hole; 3212, No. 2 sub-oil hole; 3213, No. 3 sub-oil hole; 3214, No. 4 sub-oil hole; 3215, No. 5 sub-oil hole; 3216, No. 6 sub-oil hole; 3217, No. 7 sub-oil hole; 3218, No. 8 sub-oil hole; 33, area; 331, No. 1 area; 332, No. 2 area; 333, No. 3 area; 334, No. 4 area; 335, No. 5 area; 336, No. 6 area; 337, No. 7 area; 338, No. 8 area; 34, winding slot; 4, housing; 41, oil inlet; 42, annular cavity; 5, stator winding. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fitting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0027] This paper establishes a coordinate axis Z axis, Z axis is the direction shown by the axial direction of the stator core.

[0028] As Figures 2-6As shown, the stator core of the embodiment of the present application comprises a core body 1 and a core end structure 2 arranged at the axial end of the core body 1, the core body 1 and the core end structure 2 both comprise a plurality of stator lamination layers 3, each of the stator lamination layers 3 is uniformly divided into a plurality of regions 33 along the circumferential direction thereof, each of the stator lamination layers 3 is provided with an oil groove group 31 and an oil hole group, the plurality of oil grooves 311 of the oil groove group 31 are arranged at intervals along the circumferential direction of the stator lamination layer 3 and are respectively located in the corresponding regions 33, the stator lamination layers 3 of the core body 1 are mutually superposed, and the plurality of oil grooves 311 of each of the stator lamination layers 3 are respectively correspondingly communicated to form a plurality of stator axial oil channels 11; the oil hole group comprises a plurality of sub-oil hole groups 32 arranged in rotationally staggered manner along the circumferential direction of the stator lamination layer 3, the plurality of sub-oil holes 321 of each of the sub-oil hole groups 32 are arranged at intervals along the circumferential direction of the stator lamination layer 3 and are respectively located in the corresponding regions 33, and the distances of the plurality of sub-oil holes 321 of the same sub-oil hole group 32 from the central axis of the stator lamination layer 3 decrease in turn, the stator lamination layers 3 of the core end structure 2 are rotationally superposed, and the plurality of stator lamination layers 3 are correspondingly communicated at at least one sub-oil hole 321 in each region 33 to form a stepped oil channel 21, from the direction close to the core body 1 to the direction away from the core body 1, the distances of each sub-oil hole 321 constituting the stepped oil channel 21 from the central axis of the stator lamination layer 3 decrease in turn, the stepped oil channel 21 is communicated with the corresponding stator axial oil channel 11; each of the stator lamination layers 3 comprises one stator lamination or a plurality of stator laminations aligned and stacked, and the stator laminations adopted by the plurality of stator lamination layers 3 of the core body 1 and the core end structure 2 are all the same.

[0029] Specifically, the stator lamination is in a circular ring structure, and the stator lamination layer 3 can be composed of one stator lamination or a plurality of stator laminations aligned and stacked; the plurality of stator laminations aligned and stacked are coaxially arranged, and the corresponding holes are aligned and communicated with each other, and the corresponding grooves are aligned and communicated with each other, which is equivalent to a thickened stator lamination.

[0030] The core body 1 comprises a plurality of stator lamination layers 3, and the number of stator laminations contained in each of the stator lamination layers 3 of the core body 1 can be different, that is, the thickness of each of the stator lamination layers 3 of the core body 1 can be different, and the stator lamination layers 3 of the core body 1 can be aligned and superposed along the axial direction or can be superposed after being rotated by a certain angle, if the superposition is adopted, the overall structure of the core body 1 can be more uniform, and the performance of the motor core is better, but it is necessary to ensure that the oil grooves 311 of each of the stator lamination layers 3 are aligned after rotation.

[0031] The number of the stator laminations included in each stator lamination layer 3 of the core end structure 2 can be different, i.e. the thickness of each stator lamination layer 3 of the core end structure 2 can be different, which can be flexibly set according to requirements. The core end structure 2 and the core body 1 can be assembled together after the stator lamination layers 3 are assembled respectively.

[0032] The number of the regions 33 of the stator lamination layer 3 along the circumferential direction is consistent with the number of the oil grooves 311 of the oil groove group 31, and is also consistent with the number of the sub-oil holes 321 of each sub-oil hole group 32. The plurality of oil grooves 311 of the oil groove group 31 are uniformly and spacedly arranged along the circumferential direction of the stator lamination layer 3, the plurality of sub-oil holes 321 of the sub-oil hole group 32 are uniformly and spacedly arranged along the circumferential direction of the stator lamination layer 3, the plurality of sub-oil hole groups 32 are rotationally and staggeredly arranged along the circumferential direction of the stator lamination layer 3, and the plurality of sub-oil holes 321 of each sub-oil hole group 32 are respectively located in the corresponding region 33, i.e. the number of the sub-oil holes 321 of each region 33 is equal to the number of the sub-oil hole groups 32. The number of the stator lamination layers 3 of the core end structure 2 is less than or equal to the number of the sub-oil holes 321 of each sub-oil hole group 32, which ensures that the stepped oil channel 21 can be formed after the plurality of stator lamination layers 3 are rotationally and stacked.

[0033] In the following, taking the oil groove set 31 including four oil grooves 311 and the four oil grooves 311 respectively corresponding to the four regions 33 of the stator lamination layer 3 as an example, when the core body 1 is needed to be formed, the stator lamination layers of the core body 1 are stacked in sequence, and the four oil grooves 311 of each stator lamination layer 3 are communicated respectively to form four stator axial oil channels 11. When the core end structure 2 is needed to be formed, the stator lamination layers 3 of the core end structure 2 are stacked in rotation, and since the multiple sub-oil holes 321 of the same sub-oil hole set 32 of each stator lamination layer 3 are arranged at intervals along the circumferential direction of the stator lamination layer 3 and are respectively located in the corresponding regions 33, that is, each sub-oil hole set 32 includes four sub-oil holes 321, and the distance of the four sub-oil holes 321 of each sub-oil hole set 32 from the center axis of the stator lamination layer 3 decreases in sequence, that is, the multiple sub-oil holes 321 of each sub-oil hole set 32 have a position difference in the radial direction of the stator lamination layer 3, so that the four sub-oil holes 321 of each sub-oil hole set 32 along the reference direction are a first sub-oil hole, a second sub-oil hole, a third sub-oil hole and a fourth sub-oil hole (the distance of the first sub-oil hole from the center axis of the stator lamination layer 3 is the largest, and the distance of the fourth sub-oil hole from the center axis of the stator lamination layer 3 is the smallest), when multiple stator lamination layers 3 such as two stator lamination layers 3 are placed in the order of the first stator lamination layer and the second stator lamination layer from bottom to top and stacked in rotation, the second sub-oil hole of the second stator lamination layer can be located above the first sub-oil hole of the first stator lamination layer and communicated with each other to form a stepped oil channel 21, and similarly, the third sub-oil hole of the second stator lamination layer is located above the second sub-oil hole of the first stator lamination layer and communicated with each other to form a stepped oil channel 21, the fourth sub-oil hole of the second stator lamination layer is located above the third sub-oil hole of the first stator lamination layer and communicated with each other to form a stepped oil channel 21, and the above three stepped oil channels 21 are communicated with three corresponding stator axial oil channels 11 to spray the oil in the corresponding stator axial oil channel 11 to the end of the stator winding 5 at an inclined angle, and the first sub-oil hole of the second stator lamination layer is located above the fourth sub-oil hole of the first stator lamination layer, since the difference between the distance of the first sub-oil hole from the center axis of the stator lamination layer 3 and the distance of the fourth sub-oil hole from the center axis of the stator lamination layer 3 is relatively large, the second stator lamination layer blocks the fourth sub-oil hole of the first stator lamination layer, and cannot guide the oil in the corresponding stator axial oil channel 11 out, that is, by arranging a sub-oil hole set 32 having four sub-oil holes 321, after the two stator lamination layers 3 are stacked in rotation, three stepped oil channels 21 can be formed to be communicated with three stator axial oil channels 11, in order to realize the simultaneous conduction of the four stator axial oil channels 11, multiple sub-oil hole sets 32 can be arranged in rotationally offset manner along the circumferential direction of the stator lamination layer 3, such as two sub-oil hole sets 32, one of which can be offset by three regions 33 relative to the other sub-oil hole set 32, so that each region 33 has two sub-oil holes 321, and the radial positions of the two sub-oil holes 321 of each region 33 are different and do not interfere with each other,At this time, the above-mentioned manner is used to stack and press, and six stepped oil channels 21 can be formed to ensure that at least one stepped oil channel 21 can be formed in each corresponding area 33 of the two stator lamination layers 3, that is, at least one corresponding communication between the two sub-oil holes 321 of each stator lamination layer 3 in each area 33 forms a stepped oil channel 21, so that the oil in each stator axial oil channel 11 can be inclined to the end of the stator winding 5; and when the core end structure 2 is assembled with the stator core body 1, from the direction close to the core body 1 to the direction away from the core body 1, the distance between each sub-oil hole 321 constituting the stepped oil channel 21 and the center axis of the stator lamination layer 3 decreases in turn, and the stepped oil channel 21 is inclined to the center axis of the stator winding 5, so as to realize the centripetal spraying of the stator winding 5; as described above, the stator core of the embodiment can form a plurality of oil channels for spraying the stator winding 5, and the stator lamination layers 3 of the core body 1 and the stator lamination layers 3 of the core end structure 2 of the stator core are all composed of one or more stator laminations stacked, and the stator laminations of the plurality of stator lamination layers 3 of the core body 1 and the core end structure 2 are all the same, that is, the entire stator core is composed of the same stator lamination stacked, without the need to develop multiple stator lamination molds, and without the need for additional oil rings, oil pipes and other parts, the overall manufacturing cost of the motor can be reduced.

[0034] As shown in Figure 4 It can be understood that after the plurality of stator lamination layers 3 of the core body 1 are stacked to form the core body 1, and the plurality of stator lamination layers 3 of the core end structure 2 are rotated and stacked to form the core end structure 2, the core end structure 2 can be rotated relative to the core body 1, so that the oil groove 311 of the plurality of stator lamination layers 3 of the core end structure 2 is dislocated with the stator axial oil channel 11 of the core body 1 and cannot be conducted, and the oil in the stator axial oil channel 11 of the core body 1 can only flow out through the stepped oil channel 21 of the core end structure 2.

[0035] It should be noted that the stator lamination layer 3 is divided into four regions 33 along the circumferential direction, and the four regions 33 of the stator lamination layer 3 along the circumferential direction are respectively a first region, a second region, a third region and a fourth region. Two sub-oil hole groups 32 are respectively a first sub-oil hole group and a second sub-oil hole group, and the second sub-oil hole group is offset by three regions 33 along the circumferential direction of the stator lamination layer 3 relative to the first sub-oil hole group. The sub-oil hole 321 with the largest distance from the center axis of the stator lamination layer 3 in each sub-oil hole group 321 of the first sub-oil hole group is located in the first region of the stator lamination layer 3. The sub-oil hole 321 with the largest distance from the center axis of the stator lamination layer 3 in each sub-oil hole group 321 of the second sub-oil hole group is located in the fourth region of the stator lamination layer 3. The distances of the four sub-oil holes 321 of the first sub-oil hole group from the center axis of the stator lamination layer 3 decrease in the order of the first, second, third and fourth regions. The distances of the four sub-oil holes 321 of the second sub-oil hole group from the center axis of the stator lamination layer 3 decrease in the order of the fourth, first, second and third regions. When two stator lamination layers 3, i.e. a first stator lamination layer and a second stator lamination layer, are arranged from bottom to top and stacked, the second stator lamination layer can be rotated so that the second region of the second stator lamination layer is above the first region of the first stator lamination layer. At this time, the third region of the second stator lamination layer is above the second region of the first stator lamination layer, the fourth region of the second stator lamination layer is above the second region of the first stator lamination layer, and the first region of the second stator lamination layer is above the third region of the first stator lamination layer. Then, the two sub-oil holes of the first region of the first stator lamination layer and the two sub-oil holes of the second region of the second stator lamination layer correspondingly communicate to form two stepped oil channels 21 to communicate with a stator axial oil channel 11. The two sub-oil holes of the second region of the first stator lamination layer and the two sub-oil holes 321 of the third region of the second stator lamination layer correspondingly communicate to form two stepped oil channels 21 to communicate with a stator axial oil channel 11. One of the sub-oil holes of the third region of the first stator lamination layer and one of the sub-oil holes of the fourth region of the second stator lamination layer communicate to form a stepped oil channel 21 to communicate with a stator axial oil channel 11. One of the sub-oil holes of the fourth region of the first stator lamination layer and one of the sub-oil holes of the first region of the second stator lamination layer communicate to form a stepped oil channel 21 to communicate with a stator axial oil channel 11.

[0036] Optionally, the number of oil grooves 311 of the oil groove group 31 = the number of sub-oil holes 321 of each sub-oil hole group 32 = X, and the number of stator lamination layers 3 of the core end structure 2 is N. The number of sub-oil hole groups 32 of each stator lamination layer 3 is the value of X / (X+1-N) rounded to an integer. Taking one of the sub-oil hole groups 32 as a reference, the remaining sub-oil hole groups 32 are sequentially offset by N-1 regions 33 of the stator lamination layer 3 along the circumferential direction of the stator lamination layer 3.

[0037] Specifically, when forming the end structure of the iron core, each stator lamination layer 3 is stacked sequentially according to the logic that the second sub-oil hole of the same sub-oil hole group is pressed above the first sub-oil hole, the third sub-oil hole is pressed above the second sub-oil hole, the fourth sub-oil hole is pressed above the third sub-oil hole, and so on, to form a stepped oil channel 21.

[0038] When one sub-oil hole group 32 is provided, and the number of sub-oil holes 321 in the sub-oil hole group 32 is X, and the number of stator lamination layers 3 in the iron core end structure 2 is N, the N stator lamination layers 3 can be stacked according to the above logic to form X+1-N stepped oil channels 21, that is, they can only be connected to X+1-N stator axial oil channels 11. The oil groove group 31 of each stator lamination layer 3 includes X oil grooves 311. After the multi-layer stator lamination layers 3 of the iron core body 1 are stacked, X stator axial oil channels 11 can be formed. In order to ensure X stator axial oil channels 11, the oil groove group 31 of each stator lamination layer 3 is set. The oil in the axial oil passage 11 can be discharged through the corresponding stepped oil passage 21. Multiple sub-oil hole groups 32 can be set up with circumferential rotational misalignment along the stator lamination layer 3. Adjacent sub-oil hole groups 32 can be deflected by X+1-N regions along the circumferential direction of the stator lamination layer 3. Therefore, a total of X / (X+1-N) sub-oil hole groups 32 need to be set. When calculating this value as a non-integer value, it needs to be rounded up to ensure that enough stepped oil passages 21 can be formed to smoothly discharge the oil in the corresponding stator axial oil passage 11.

[0039] like Figures 3-4 As shown, optionally, the core end structure 2 includes five stator lamination layers 3 that are rotated and stacked, and the oil hole group includes two sub-oil hole groups 32, namely the first sub-oil hole group and the second sub-oil hole group. The first sub-oil hole group and the second sub-oil hole group each include eight sub-oil holes 321. The second sub-oil hole group is deflected by four regions 33 relative to the first sub-oil hole group along the circumference of the stator lamination layer 3. The angle of the five stator lamination layers 3 of the core end structure 2 being rotated and misaligned in sequence is equal to the angle spanned by two adjacent regions 33 of the stator lamination layer 3.

[0040] Specifically, when the sub-oil hole group 32 includes eight sub-oil holes 321, the stator lamination layer 3 is provided with eight regions 33 along the circumference. The angle spanning two adjacent regions 33 is 45°. The five stator lamination layers 3 of the core end structure 2 are rotated and misaligned in sequence to form the angle spanning two adjacent regions 33 of the stator lamination layer 3, that is, the five stator lamination layers 3 are rotated and misaligned in sequence by 45° to form a stepped oil channel 21 extending radially in a stepped manner. The two sub-oil hole groups 32, namely the first sub-oil hole group and the second sub-oil hole group, are relatively deflected by four regions 33. The specific deflection angle can be 180°+α, where α is the relative deflection angle of two sub-oil holes 321 in the same region.

[0041] like Figure 5As shown, the eight sub-oil holes 321 of each sub-oil hole group are sequentially a first sub-oil hole 3211, a second sub-oil hole 3212, a third sub-oil hole 3213, an eighth sub-oil hole 3218, and the distance of the eight sub-oil holes 321 from the center axis of the stator lamination layer 3 decreases sequentially along the direction of the first sub-oil hole 3211, the second sub-oil hole 3212, the third sub-oil hole 3213, the eighth sub-oil hole 3218; the core end structure 2 is formed by rotating and stacking five stator lamination layers 3, and the five stator lamination layers 3 are respectively a first stator lamination layer, a second stator lamination layer, a third stator lamination layer, a fourth stator lamination layer and a fifth stator lamination layer; the eight regions 33 of each stator lamination layer 3 along the circumference are sequentially a first region 331, a second region 332, a third region 333, an eighth region 338, and the first sub-oil hole 3211 of the first sub-oil hole group is located in the first region 331, the second sub-oil hole 3212 is located in the second region 332, the third sub-oil hole 3213 is located in the third region 333, the fourth sub-oil hole 3214 is located in the fourth region 334, the fifth sub-oil hole 3215 is located in the fifth region 335, the sixth sub-oil hole 3216 is located in the sixth region 336, the seventh sub-oil hole 3217 is located in the seventh region 337, and the eighth sub-oil hole 3218 is located in the eighth region 338; the first sub-oil hole 3211 of the second sub-oil hole group is located in the fifth region 335, the second sub-oil hole 3212 is located in the sixth region 336, the third sub-oil hole 3213 is located in the seventh region 337, the fourth sub-oil hole 3214 is located in the eighth region 338, the fifth sub-oil hole 3215 is located in the first region 331, the sixth sub-oil hole 3216 is located in the second region 332, the seventh sub-oil hole 3217 is located in the third region 333, and the eighth sub-oil hole 3218 is located in the fourth region 334; when the core end structure 2 is formed, the second region 332 of the second stator lamination layer can be pressed above the first region 331 of the first stator lamination layer, the third region 333 of the third stator lamination layer can be pressed above the second region 332 of the second stator lamination layer, the fourth region 334 of the fourth stator lamination layer can be pressed above the third region 333 of the third stator lamination layer, and the fifth region 335 of the fifth stator lamination layer can be pressed above the fourth region 334 of the fourth stator lamination layer;

[0042] At this time, the first oil hole 3211 of the first oil hole group of the first stator sheet layer, the second oil hole 3212 of the first oil hole group of the second stator sheet layer, the third oil hole 3213 of the first oil hole group of the third stator sheet layer, the fourth oil hole 3214 of the first oil hole group of the fourth stator sheet layer, and the fifth oil hole 3215 of the first oil hole group of the fifth stator sheet layer correspondingly communicate to form the stepped oil gallery 21, the second oil hole 3212 of the first oil hole group of the first stator sheet layer, the third oil hole 3213 of the first oil hole group of the second stator sheet layer, the fourth oil hole 3214 of the first oil hole group of the third stator sheet layer, the fifth oil hole 3215 of the first oil hole group of the fourth stator sheet layer, and the sixth oil hole 3216 of the first oil hole group of the fifth stator sheet layer correspondingly communicate to form the stepped oil gallery 21, the third oil hole 3213 of the first oil hole group of the first stator sheet layer, the fourth oil hole 3214 of the first oil hole group of the second stator sheet layer, the fifth oil hole 3215 of the first oil hole group of the third stator sheet layer, the sixth oil hole 3216 of the first oil hole group of the fourth stator sheet layer, and the seventh oil hole 3217 of the first oil hole group of the fifth stator sheet layer correspondingly communicate to form the stepped oil gallery 21, the fourth oil hole 3214 of the first oil hole group of the first stator sheet layer, the fifth oil hole 3215 of the first oil hole group of the second stator sheet layer, the sixth oil hole 3216 of the first oil hole group of the third stator sheet layer, the seventh oil hole 3217 of the first oil hole group of the fourth stator sheet layer, and the eighth oil hole 3218 of the first oil hole group of the fifth stator sheet layer correspondingly communicate to form the stepped oil gallery 21;

[0043] The first sub-oil hole 3211 of the second sub-oil hole group of the first stator lamination layer, the second sub-oil hole 3212 of the second stator lamination layer, the third sub-oil hole 3213 of the second sub-oil hole group of the third stator lamination layer, the fourth sub-oil hole 3214 of the second sub-oil hole group of the fourth stator lamination layer, and the fifth sub-oil hole 3215 of the second sub-oil hole group of the fifth stator lamination layer are connected to form a stepped oil channel 21. The second sub-oil hole 3212 of the second sub-oil hole group of the first stator lamination layer, the third sub-oil hole 3213 of the second sub-oil hole group of the second stator lamination layer, the fourth sub-oil hole 3214 of the second sub-oil hole group of the third stator lamination layer, the fifth sub-oil hole 3215 of the second sub-oil hole group of the fourth stator lamination layer, and the sixth sub-oil hole 3216 of the second sub-oil hole group of the fifth stator lamination layer are connected to form a stepped oil channel 21. The third sub-oil hole 3211 of the second sub-oil hole group of the first stator lamination layer, the third sub-oil hole 3212 of the second sub-oil hole group of the second stator lamination layer, the fourth sub-oil hole 3214 of the second sub-oil hole group of the third stator lamination layer, the fifth sub-oil hole 3215 of the second sub-oil hole group of the fourth stator lamination layer, and the sixth sub-oil hole 3216 of the second sub-oil hole group of the fifth stator lamination layer are connected to form a stepped oil channel 21. Sub-oil hole 3213, sub-oil hole 3214 of the second sub-oil hole group of the second stator lamination layer, sub-oil hole 3215 of the second sub-oil hole group of the third stator lamination layer, sub-oil hole 3216 of the second sub-oil hole group of the fourth stator lamination layer, and sub-oil hole 3217 of the second sub-oil hole group of the fifth stator lamination layer are connected to form a stepped oil channel 21. Sub-oil holes 3214 of the second sub-oil hole group of the eighth region 338 of the first stator lamination layer, sub-oil hole 3215 of the second sub-oil hole group of the second stator lamination layer, sub-oil hole 3216 of the second sub-oil hole group of the third stator lamination layer, sub-oil hole 3217 of the second sub-oil hole group of the fourth stator lamination layer, and sub-oil hole 3218 of the second sub-oil hole group of the fifth stator lamination layer are connected to form a stepped oil channel 21. Thus, the core end structure 2 has eight stepped oil channels 21 along its circumference.

[0044] The number of oil grooves 311 in the oil groove group 31 is the same as the number of sub-oil holes in the sub-oil hole group 32, both being eight. Thus, the eight oil grooves 311 of each stator lamination layer 3 of the stator core body 1 are connected to each other, forming eight stator axial oil channels 11.

[0045] When the stator core body 1 and the core end structure 2 are stacked, the eight stator axial oil passages 11 can be connected to the corresponding stepped oil passages 21, thereby achieving radial oil spraying to the ends of the stator windings 5. Furthermore, the core end structure 2 is formed by rotating and stacking five stator lamination layers 3, allowing the stepped oil passages 21 to have a more suitable spray angle. Of course, in other embodiments, six or other numbers of stator lamination layers 3 can also be used.

[0046] like Figure 6 As shown, optionally, multiple oil groove groups 31 and oil hole groups are respectively provided, with one oil groove group 31 and oil hole group as the basis, and the remaining oil groove groups 31 and oil hole groups are sequentially rotated and staggered along the circumference of the stator lamination layer 3.

[0047] For example, two oil groove groups 31 and two oil hole groups can be provided. Since the two oil groove groups 31 and the two oil hole groups are all arranged in a circumferentially offset manner along the stator lamination layer 3, when the multiple stator lamination layers 3 of the iron core body 1 are stacked so that the oil grooves 311 of one oil groove group 31 are connected, the oil grooves 311 of the other oil groove group 31 are also connected. When the multiple stator lamination layers 3 of the iron core end structure 2 are stacked so that the sub-oil holes 321 of one oil hole group are connected, the sub-oil holes 321 of the other oil hole group can also be connected.

[0048] In this embodiment, by setting multiple oil groove groups 31 and oil hole groups, more stator axial oil channels 11 can be formed in the circumference of the stator core body 1, and more stepped oil channels 21 can be formed in the circumference of the core end structure 2, thereby improving the cooling effect on the stator winding 5.

[0049] like Figures 5-6 As shown, optionally, the opening of the oil groove 311 is oriented away from the central axis of the stator lamination layer 3. The oil groove 311 is oriented away from the central axis of the stator lamination layer 3, meaning that multiple stator axial oil channels 11 of the core body 1 are arranged along the circumferential outer edge of the core body 1. When the stator core is assembled into the housing 4, the stator axial oil channels 11 can form a cavity with the inner wall of the housing 4, facilitating the direct provision of an oil inlet 41 communicating with the cavity on the housing 4 to supply oil to the cooling oil channels of the stator winding 5.

[0050] Optionally, the stator lamination layer 3 is provided with a plurality of winding slots 34 at intervals along its circumference. The winding slots 34 are located on the side of the oil groove 311 near the central axis of the stator lamination layer 3. The span angle between two adjacent oil grooves 311 of the oil groove group 31 is an integer multiple of the span angle between two adjacent winding slots 34.

[0051] Specifically, the winding slot 34 can be a rectangular slot used to accommodate the stator winding. The stator lamination layer 3 has multiple winding slots 34 in the circumferential direction, and the winding slots 34 are located near the inner edge of the stator lamination layer 3 in the circumferential direction. The oil groove group 31 and the oil hole group are located near the outer edge of the stator lamination layer 3 in the circumferential direction.

[0052] In this embodiment, the span angle between two adjacent oil grooves 311 of the oil groove group 31 is an integer multiple of the span angle between two adjacent winding grooves 34. When the angle at which each stator lamination layer 3 rotates sequentially is equal to the span angle between two adjacent regions 33 of the stator lamination layer 3, that is, when the angle at which each stator lamination layer 3 rotates sequentially is equal to the span angle between two adjacent oil grooves 311 of the oil groove group 31, the winding grooves 34 of each stator lamination layer 3 can be connected accordingly, which facilitates the installation of the stator winding 5.

[0053] Optionally, the plurality of sub-oil holes 321 are located on the circumferential side of the oil groove 311 along the stator lamination layer 3, so that the oil groove 311 and all the sub-oil holes 321 in the same area 33 can form a larger position difference along the circumferential direction of the stator lamination layer 3, avoiding the communication between some sub-oil holes 321 and the oil groove 311, so that the oil in the stator axial oil channel 11 is not only sprayed from the stepped oil channel 21 of the core end structure 2, but also discharged from the oil groove 311 of each stator lamination layer 3 of the core end structure 2 along the axial direction parallel to the stator core, causing oil leakage.

[0054] In addition, compared with arranging the sub-oil hole 321 on the side of the oil groove 311 towards the central axis of the stator lamination layer 3, arranging the sub-oil hole 321 on the circumferential side of the oil groove 311 along the stator lamination layer 3 can ensure that the stator axial oil channel 11 formed by the oil groove 311 and the stepped oil channel 21 formed by the sub-oil hole 321 can correspondingly communicate, and on the other hand, can avoid the sub-oil hole 321 being too close to the winding slot 34, thereby avoiding the fracture damage of the stator lamination layer 3 along the radial direction.

[0055] The sub-oil hole 321 with the largest distance from the central axis of the stator lamination layer 3 in the plurality of sub-oil holes 321 of the sub-oil hole group 32 can be a notch arranged at the outer edge of the stator lamination layer 3, and the other sub-oil holes 321 can be circular or elliptical small holes.

[0056] As shown in Figure 2 and Figure 4 Optionally, the axial both ends of the core body 1 are respectively provided with the core end structure 2, and the two ends of the stator axial oil channel 11 respectively communicate with the corresponding stepped oil channel 21 of the two core end structures 2. The oil in the stator axial oil channel 11 can flow to the stepped oil channels 21 at both ends, respectively, to realize the centripetal oil cooling of the two ends of the stator winding 5.

[0057] As shown in Figures 1-2 Another embodiment of the present application provides a motor comprising the above-mentioned stator core. The motor has the same advantages as the above-mentioned stator core, and will not be repeated.

[0058] As shown in Figures 1-2 Optionally, the motor further comprises a housing 4, the housing 4 is sleeved on the outside of the stator core, the housing 4 is provided with an oil inlet 41, and the inner wall of the housing 4 is provided with an annular recess 42 extending along the circumferential direction at the position corresponding to the stator core body 1, the annular recess 42 communicates with the oil inlet 41 and each stator axial oil channel 11 of the stator core.

[0059] In the embodiment, the casing 4 can be a cylindrical structure. By arranging an annular cavity 42 on the inner wall of the casing 4 and corresponding to the stator core body 1, the annular cavity 42 is communicated with the stator axial oil channel 11. By arranging an oil inlet 41 on the casing 4 and communicated with the annular cavity 42, the oil from the oil inlet 41 can flow into the annular cavity 42, and then flow into each stator axial oil channel 11 and sprayed to the stator winding 5 from the stepped oil channel 21.

[0060] A vehicle including the motor is also provided in another embodiment of the present application. The vehicle has the same advantages as the motor, and thus will not be repeated here.

[0061] Although the present application has been disclosed with reference to the above embodiments, the present application is not limited to the above. Various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present application, and such changes and modifications shall fall within the scope of the present application.

Claims

1. A stator core characterized by, The iron core body (1) and the iron core end structure (2) are both composed of a plurality of stator lamination layers (3), each of the stator lamination layers (3) is uniformly divided into a plurality of regions (33) along the circumferential direction, each of the stator lamination layers (3) is provided with an oil groove group (31) and an oil hole group, a plurality of oil grooves (311) of the oil groove group (31) are uniformly and spacedly arranged along the circumferential direction of the stator lamination layer (3) and are respectively located in the corresponding region (33), the stator lamination layers (3) of the iron core body (1) are mutually superposed, and the plurality of oil grooves (311) of each of the stator lamination layers (3) are respectively correspondingly connected to form a plurality of stator axial oil channels (11); the oil hole group includes a plurality of sub-oil hole groups (32) arranged in rotationally staggered manner along the circumferential direction of the stator lamination layer (3), a plurality of sub-oil holes (321) of each of the sub-oil hole groups (32) are arranged in a cycle period and uniformly spacedly along the circumferential direction of the stator lamination layer (3), and the plurality of sub-oil holes (321) of each of the sub-oil hole groups (32) are respectively located in the corresponding region (33), the oil grooves (311) and the sub-oil holes (321) in the same region (33) are spacedly arranged along the circumferential direction of the stator lamination layer (3), and the distances of the plurality of sub-oil holes (321) of the same sub-oil hole group (32) from the central axis of the stator lamination layer (3) gradually decrease, the stator lamination layers (3) of the iron core end structure (2) are rotationally superposed, and the plurality of stator lamination layers (3) are correspondingly connected at at least one sub-oil hole (321) in each region (33) to form a stepped oil channel (21), from the direction close to the iron core body (1) to the direction away from the iron core body (1), the distances of the sub-oil holes (321) forming the stepped oil channel (21) from the central axis of the stator lamination layer (3) gradually decrease, the stepped oil channel (21) is connected with the corresponding stator axial oil channel (11); each of the stator lamination layers (3) includes one stator lamination or a plurality of stator laminations stacked in alignment, and the stator laminations of the plurality of stator lamination layers (3) of the iron core body (1) and the iron core end structure (2) are all the same.

2. The stator core according to claim 1, characterized by The number of oil grooves (311) of the oil groove group (31) is equal to the number of sub-oil holes (321) of each of the sub-oil hole groups (32), which is X, the number of stator lamination layers (3) of the iron core end structure (2) is N, the number of sub-oil hole groups (32) of each of the stator lamination layers (3) is the value of X / (X+1-N) rounded to an integer, and one of the sub-oil hole groups (32) is taken as a reference, and the remaining sub-oil hole groups (32) are staggered by N-1 regions (33) of the stator lamination layer (3) along the circumferential direction of the stator lamination layer (3).

3. The stator core of claim 2, characterized by The iron core end structure (2) comprises five rotationally laminated stator lamination layers (3), the oil hole groups comprise two sub oil hole groups (32), namely a first sub oil hole group and a second sub oil hole group, the first sub oil hole group and the second sub oil hole group each comprise eight sub oil holes (321), the second sub oil hole group is offset by four regions (33) along the circumference of the stator lamination layer (3) relative to the first sub oil hole group, and the five stator lamination layers (3) of the iron core end structure (2) are sequentially rotationally offset by an angle equal to the angle spanned by two adjacent regions (33) of the stator lamination layer (3).

4. The stator core of claim 1, characterized by The oil groove groups (31) and the oil hole groups are respectively provided in plurality, and based on one of the oil groove groups (31) and the oil hole groups, the remaining oil groove groups (31) and oil hole groups are sequentially rotationally offset along the circumference of the stator lamination layer (3).

5. The stator core of claim 1, characterized by The notch of the oil groove (311) is arranged in a direction away from the central axis of the stator lamination layer (3); and / or, a plurality of winding grooves (34) are arranged along the circumference of the stator lamination layer (3) at intervals, the winding grooves (34) are located on the side of the oil groove (311) close to the central axis of the stator lamination layer (3), and the angle spanned by two adjacent oil grooves (311) of the oil groove group (31) is an integer multiple of the angle spanned by two adjacent winding grooves (34).

6. The stator core of claim 1, characterized by In the same region (33), a plurality of sub oil holes (321) are located on one side of the corresponding oil groove (311) along the circumference of the stator lamination layer (3).

7. The stator core of claim 1, characterized by The iron core body (1) is respectively provided with the iron core end structure (2) at both axial ends, and the two ends of the stator axial oil channel (11) are respectively communicated with the corresponding stepped oil channels (21) of the two iron core end structures (2).

8. An electric machine characterized by The stator iron core comprises the stator iron core according to any one of claims 1-7.

9. The electric machine of claim 8, wherein, The machine shell (4) is sleeved on the outside of the stator iron core, the machine shell (4) is provided with an oil inlet (41), and the inner wall of the machine shell (4) is provided with an annular recess (42) extending along the circumference at a position corresponding to the stator iron core body (1), the annular recess (42) is communicated with the oil inlet (41) and each stator axial oil channel (11) of the stator iron core.

10. A vehicle characterized by comprising: The motor comprises the motor according to any one of claims 8-9.

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