Stator core, motor and vehicle

Abstract

The invention provides a stator iron core, a motor and a vehicle, and relates to the technical field of vehicle parts, an iron core body and an iron core end structure both comprise a plurality of stator punching sheet layers, each stator punching sheet layer is provided with an oil groove group and an oil hole group, a plurality of oil grooves of the oil groove group are arranged at intervals along the circumferential direction of the stator punching sheet layer, and the oil hole group is provided with a plurality of oil holes. The stator punching sheet layers of the iron core body are mutually laminated, so that the corresponding oil grooves are mutually communicated to form a stator axial oil duct; the oil hole group comprises a plurality of sub oil hole groups which are rotationally arranged in a staggered manner, the plurality of sub oil holes of each sub oil hole group are arranged at intervals along the circumferential direction of the stator punching sheet layer, and the distances between the plurality of sub oil holes of the same sub oil hole group and the central axis of the stator punching sheet layer are sequentially reduced; the stator punching sheet layers of the iron core end structure are rotationally laminated so that the corresponding sub oil holes can be communicated with one another to form a stepped oil duct, and the stepped oil duct is communicated with the stator axial oil duct. Centripetal oil cooling can be realized by adopting one stator punching sheet, and the cost of a stator punching sheet die is relatively low.

Description

Technical Field

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

[0002] During the operation of the vehicle drive motor, a large amount of heat will be generated. In order to ensure the performance of the drive motor, it is usually necessary to cool it. Compared with air cooling and water cooling, oil cooling has a better heat dissipation effect, so it is widely used. The specific implementation methods of existing oil cooling are usually the following two: one is to set an oil channel on the stator core, and set an oil ring or oil pipe at the end of the core to guide the cooling oil in the oil channel to the end of the stator winding to achieve oil cooling of the stator winding. Since additional parts such as oil rings and oil pipes are required, the overall manufacturing cost of the motor is increased; the second is that the stator core is formed by stacking a variety of different stator punchings, 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 a variety of stator punchings, it is necessary to develop multiple sets of stator punching molds, which increases the overall manufacturing cost of the motor. Summary of the invention

[0003] The invention aims to solve the technical problem of high oil cooling cost of existing motors.

[0004] In a first aspect, the present invention provides a stator core, comprising a core body and a core end structure arranged at an axial end of the core body, wherein the core body and the core end structure both comprise a plurality of stator punching sheet layers, each of the stator punching sheet layers being evenly divided into a plurality of regions along its circumference, each of the stator punching sheet 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 circumference of the stator punching sheet layer and being respectively located in the corresponding regions, the stator punching sheet layers of the core body being superimposed on each other, and the plurality of oil grooves of each stator punching sheet layer being respectively connected to form a plurality of stator axial oil passages; the oil hole group comprises a plurality of sub-oil hole groups arranged in a circumferential rotational staggered manner along the stator punching sheet layer, and the plurality of sub-oil holes of each sub-oil hole group being arranged along the stator punching sheet. The layers are arranged at circumferential intervals and are respectively located in the corresponding areas, and the distances of the multiple sub-oil holes of the same sub-oil hole group from the central axis of the stator punching layer are gradually reduced. The stator punching layers of the core end structure are rotated and stacked, and at least one sub-oil hole in each area of ​​the multiple stator punching layers is correspondingly connected to form a stepped oil passage. From the direction close to the core body toward the direction away from the core body, the distances of the sub-oil holes constituting the stepped oil passage from the central axis of the stator punching layer are gradually reduced, and the stepped oil passage is connected with the corresponding stator axial oil passage; each stator punching layer includes a stator punching or a plurality of stator punchings stacked in an aligned manner, and the stator punchings used in the core body and the multiple stator punching layers of the core end structure are the same.

[0005] Optionally, let the number of oil grooves in the oil groove group = the number of sub-oil holes in each sub-oil hole group = X, and the number of stator punching sheet layers of the core end structure is N, then the number of sub-oil hole groups in each stator punching sheet layer is X / (X+-N), and the value is rounded up using the integer method. Taking one of the sub-oil hole groups as a reference, the remaining sub-oil hole groups are deflected in sequence along the circumferential direction of the stator punching sheet layer to N-regions of the stator punching sheet.

[0006] Optionally, the core end structure includes five rotated and stacked stator punching sheet layers, the oil hole group includes two sub-oil hole groups, 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 include eight sub-oil holes, the second sub-oil hole group is deflected by four regions relative to the first sub-oil hole group along the circumferential direction of the stator punching sheet layer, and the five stator punching sheet layers of the core end structure are rotated and displaced in sequence by an angle equal to the angle spanned by two adjacent regions of the stator punching sheet layer.

[0007] Optionally, the oil groove groups and the oil hole groups are respectively provided with a plurality of corresponding ones, and based on one of the oil groove groups and the oil hole groups, the remaining oil groove groups and the oil hole groups are sequentially rotated and staggered along the circumferential direction of the stator punching layer.

[0008] Optionally, the slot opening of the oil groove is arranged in a direction away from the central axis of the stator punching layer; and / or, the stator punching layer is provided with a plurality of winding slots at intervals along its circumferential direction, the winding slots are located on the side of the oil groove close to the central axis of the stator punching layer, and the span angle of two adjacent oil grooves of the oil groove group is an integer multiple of the span angle of two adjacent winding slots.

[0009] Optionally, in the same area, a plurality of sub-oil holes are all located on one side of the corresponding oil groove along the circumferential direction of the stator punching layer.

[0010] Optionally, the core end structures are respectively provided at two axial ends of the core body, and two ends of the stator axial oil passage are respectively connected to corresponding stepped oil passages of the two core end structures.

[0011] In a second aspect, the present invention provides a motor, comprising the above-mentioned stator core.

[0012] Optionally, the motor further includes a casing, which is sleeved on the outside of the stator core, and an oil inlet is provided on the casing. The inner wall of the casing is provided with an annular cavity extending along its circumference at a position corresponding to the stator core body, and the annular cavity is connected to the oil inlet and each stator axial oil channel of the stator core.

[0013] In a third aspect, the present invention provides a vehicle comprising the above-mentioned motor.

[0014] The stator core, motor and vehicle of the present invention 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 stacking a plurality of stator punching sheets, and each stator punching sheet layer includes one or more stator punching sheets. The stator punching sheets used in the core body and the plurality of stator punching sheets of the core end structure are the same, that is, the core body and the core end structure are formed by stacking the same stator punching sheets. When the stator punching sheet layer is composed of a plurality of stator punching sheets, the stator punching sheets are aligned and stacked, which is equivalent to a thickened stator punching sheet.

[0016] Assuming that the oil groove group includes four oil grooves and the four oil grooves are respectively located in four areas of the stator punching layer, when it is necessary to form the core body, the stator punching layers of the core body are stacked in sequence, and the four oil grooves of each stator punching layer are respectively connected to form four stator axial oil channels; when it is necessary to form the core end structure, the stator punching layers of the core end structure are rotated and stacked. Since the multiple sub-oil holes of the same sub-oil hole group of each stator punching layer are arranged at intervals along the circumference of the stator punching layer and are respectively located in corresponding areas, that is, each sub-oil hole group includes four sub-oil holes, and the distances of the four sub-oil holes of each sub-oil hole group from the central axis of the stator punching layer decrease successively, that is, the multiple sub-oil holes of each sub-oil hole group are arranged at intervals along the circumference of the stator punching layer and are respectively located in corresponding areas, that is, each sub-oil hole group includes four sub-oil holes, and the distances of the four sub-oil holes of each sub-oil hole group from the central axis of the stator punching layer decrease successively, that is, the multiple sub-oil holes of each sub-oil hole group are arranged at intervals along the circumference of the stator punching layer. The sub-punch layer has a position difference in the radial direction, so that the four sub-oil holes of each sub-oil hole group along the calibration direction are respectively No. 1 sub-oil hole, No. 2 sub-oil hole, No. 3 sub-oil hole and No. 4 sub-oil hole. When multiple stator punch layers, such as two stator punch layers, are placed and rotated in the order of the first stator punch layer and the second stator punch layer from bottom to top and stacked, the No. 2 sub-oil hole of the second stator punch layer can be located above the No. 1 sub-oil hole of the first stator punch layer, and the two are interconnected to form a stepped oil passage. Similarly, the No. 3 sub-oil hole of the second stator punch layer is located above the No. 2 sub-oil hole of the first stator punch layer, and the two are interconnected to form a stepped oil passage. The No. 4 sub-oil hole of the second stator punch layer is located above the No. 3 sub-oil hole of the first stator punch layer, and the No. 2 The three oil channels are connected to each other to form a stepped oil passage, and the three stepped oil passages are connected to the three corresponding stator axial oil passages respectively to spray the oil in the corresponding stator axial oil passages to the ends of the stator windings at an inclined angle, and the No. 1 oil hole of the second stator punching layer is located above the No. 4 oil hole of the first stator punching layer. Since the distance between the No. 1 oil hole and the central axis of the stator punching layer and the distance between the No. 4 oil hole and the central axis of the stator punching layer are relatively large, the second stator punching layer blocks the No. 4 oil hole of the first stator punching layer, and the oil in the corresponding stator axial oil passage cannot be guided out, that is, after the two stator punching layers are rotated and superimposed, a sub-oil hole group is set to form three stepped oil passages to communicate with the three stator axial oil passages. In order to realize the simultaneous conduction of the four stator axial oil passages, a plurality of sub-oil hole groups that are mutually rotationally staggered can be arranged along the circumferential direction of the stator punching layer, such as setting two sub-oil hole groups, one of which can be deflected by three regions relative to the other sub-oil hole group, so that each region has two sub-oil holes, and the radial positions of the two sub-oil holes in each region are different and do not interfere with each other. After lamination in the above manner, six stepped oil passages can be formed, ensuring that at least one stepped oil passage can be formed in each corresponding region of the two stator punching layers, that is, at least one of the two sub-oil holes in each region of each stator punching layer is correspondingly connected to form a stepped oil passage, so that the oil in each stator axial oil passage can be tilted and sprayed toward the end of the stator winding;When the stator end structure is assembled with the stator core body, the distances of the oil holes constituting the stepped oil passage from the central axis of the stator sheet layer decrease successively from the direction close to the core body toward the direction away from the core body, and the stepped oil passage is tilted approximately toward the central axis of the stator winding, so as to realize the centripetal spraying of the stator winding; in summary, the stator core of the present invention can form a multi-channel oil passage spraying toward the stator winding, and the stator sheet layer of the core body of the stator core and the stator sheet layer of the core end structure are both composed of one or more stator sheets stacked, that is, the entire stator core is composed of the same stator sheet stacked, and there is no need to develop multiple sets of stator sheet molds, and there is no need to use additional parts such as oil rings and oil pipes, nor is there a need to develop multiple sets of stator sheet molds, which can reduce the overall manufacturing cost of the motor. ; BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a motor according to an embodiment of the present invention;

[0018] Figure 2 A cross-sectional view of half of the motor according to an embodiment of the present invention, with the central axis of the stator core as the symmetry dividing line;

[0019] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle, where the arrow indicates the direction of oil flow;

[0020] Figure 4 Schematic diagram of the structure of the outer peripheral wall of the stator core of an embodiment of the present invention, wherein the arrow indicates the flow direction of the oil;

[0021] Figure 5 It is a structural schematic diagram of an oil groove group and an oil hole group provided on a stator punching layer according to an embodiment of the present invention;

[0022] Figure 6 It is a structural schematic diagram of two oil groove groups and two oil hole groups arranged on a stator punching layer according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Core body; 11. Stator axial oil channel; 2. Core end structure; 21. Step oil channel; 3. Stator punching 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 Hole; 3217, sub-oil hole No. 7; 3218, sub-oil hole No. 8; 33, area; 331, area No. 1; 332, area No. 2; 333, area No. 3; 334, area No. 4; 335, area No. 5; 336, area No. 6; 337, area No. 7; 338, area No. 8; 34, winding slot; 4, casing; 41, oil inlet; 42, annular cavity; 5, stator winding. DETAILED DESCRIPTION

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

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "matched" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0028] like Figure 2-Figure 6As shown, a stator core according to an embodiment of the present invention comprises a core body 1 and a core end structure 2 arranged at an axial end of the core body 1, the core body 1 and the core end structure 2 both comprise a plurality of stator punching sheet layers 3, each of the stator punching sheet layers 3 is evenly divided into a plurality of regions 33 along its circumferential direction, each of the stator punching sheet 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 punching sheet layer 3 and are respectively located in the corresponding regions 33, the stator punching sheet layers 3 of the core body 1 are mutually superimposed, and the plurality of oil grooves 311 of each stator punching sheet layer 3 are respectively connected to form a plurality of stator axial oil passages 11; the oil hole group comprises a plurality of sub-oil hole groups 32 arranged in a circumferential rotational staggered manner along the stator punching sheet layer 3, and the plurality of sub-oil holes 321 of each sub-oil hole group 32 are arranged along the circumferential direction of the stator punching sheet layer 3. The sheet layers 3 are arranged at circumferential intervals and are respectively located in the corresponding areas 33, and the distances of the multiple sub-oil holes 321 of the same sub-oil hole group 32 from the central axis of the stator punching layer 3 are gradually reduced. The stator punching layers 3 of the core end structure 2 are rotated and stacked, and at least one sub-oil hole 321 of the multiple stator punching layers 3 in each area 33 is correspondingly connected to form a stepped oil passage 21. From the direction close to the core body 1 toward the direction away from the core body 1, the distances of the sub-oil holes 321 constituting the stepped oil passage 21 from the central axis of the stator punching layer 3 are gradually reduced, and the stepped oil passage 21 is connected with the corresponding stator axial oil passage 11; each stator punching layer 3 includes a stator punching or a plurality of stator punchings stacked in an aligned manner, and the stator punchings used in the core body 1 and the multiple stator punching layers 3 of the core end structure 2 are the same.

[0029] Specifically, the stator punching sheet is a circular ring structure, and the stator punching sheet layer 3 can be composed of one stator punching sheet or a plurality of stator punching sheets aligned and stacked; the plurality of stator punching sheets aligned and stacked means that the stator punching sheets are coaxially arranged, and the corresponding holes are aligned and connected with each other, and the corresponding grooves are aligned and connected with each other, which is equivalent to a thickened stator punching sheet.

[0030] The core body 1 includes multiple stator punching sheet layers 3. The number of stator punching sheets contained in each stator punching sheet layer 3 of the core body 1 may be different, that is, the thickness of each stator punching sheet layer 3 of the core body 1 may be different. The stator punching sheet layers 3 of the core body 1 can be aligned and stacked along the axial direction, or they can be rotated and stacked after a certain angle. If rotational stacking is adopted, the overall structure of the core body 1 can be made more uniform and the performance of the motor core can be better. However, it is necessary to ensure that the oil grooves 311 of each stator punching sheet layer 3 are aligned after rotation.

[0031] The number of stator sheets contained in each stator sheet layer 3 of the core end structure 2 may be different, that is, the thickness of each stator sheet layer 3 of the core end structure 2 may be different, and can be flexibly set according to needs. The core end structure 2 and the core body 1 can be assembled together after the stator sheet layers 3 are assembled separately.

[0032] The number of regions 33 of the stator sheet layer 3 along the circumferential direction is consistent with the number of oil grooves 311 included in the oil groove group 31, and is also consistent with the number of sub-oil holes 321 included in each sub-oil hole group 32. The multiple oil grooves 311 of the oil groove group 31 are evenly spaced along the circumference of the stator sheet layer 3, and the multiple sub-oil holes 321 of the sub-oil hole group 32 are evenly spaced along the circumference of the stator sheet layer 3. The multiple sub-oil hole groups 32 are arranged in a circumferential rotational staggered manner along the stator sheet layer 3, and the multiple sub-oil holes 321 of each sub-oil hole group 32 are respectively located in the corresponding regions 33, that is, the number of sub-oil holes 321 in each region 33 is the number of sub-oil hole groups 32. The number of stator sheet layers 3 of the core end structure 2 is less than or equal to the number of sub-oil holes 321 included in each sub-oil hole group 32, ensuring that the stepped oil channel 21 can be formed after the multiple stator sheet layers 3 are rotated and stacked.

[0033] Below, an example is taken in which the oil groove group 31 includes four oil grooves 311 and the four oil grooves 311 correspond to four areas 33 of the stator punching layer 3 respectively. When the core body 1 needs to be formed, the stator punching layers of the core body 1 are stacked in sequence, and the four oil grooves 311 of each stator punching layer 3 are connected respectively to form four stator axial oil channels 11. When it is necessary to form the core end structure 2, the stator sheet layers 3 of the core end structure 2 are rotated and stacked. Since the multiple sub-oil holes 321 of the same sub-oil hole group 32 of each stator sheet layer 3 are arranged at intervals along the circumference of the stator sheet layer 3 and are respectively located in the corresponding areas 33, that is, each sub-oil hole group 32 includes four sub-oil holes 321, and the distances of the four sub-oil holes 321 of each sub-oil hole group 32 from the central axis of the stator sheet layer 3 are successively reduced, that is, the multiple sub-oil holes 321 of each sub-oil hole group 32 have a position difference in the radial direction of the stator sheet layer 3, so that the four sub-oil holes 321 of each sub-oil hole group 32 along the calibration direction are respectively sub-oil holes 321, 321, 321 and 321. The oil hole, the second oil hole, the third oil hole and the fourth oil hole (the first oil hole is the largest distance from the central axis of the stator punching layer 3, and the fourth oil hole is the smallest distance from the central axis of the stator punching layer 3). When multiple stator punching layers 3, such as two stator punching layers, are placed and rotated in the order of the first stator punching layer and the second stator punching layer from bottom to top, the second oil hole of the second stator punching layer can be located above the first oil hole of the first stator punching layer and the two are interconnected to form a stepped oil passage 21. Similarly, the third oil hole of the second stator punching layer is located above the second oil hole of the first stator punching layer and the two are interconnected to form a stepped oil passage 21. The No. 4 oil hole of the punching layer is located above the No. 3 oil hole of the first stator punching layer, and the two are interconnected to form a stepped oil passage 21. The above three stepped oil passages 21 are respectively connected to the three corresponding stator axial oil passages 11 to spray the oil in the corresponding stator axial oil passages 11 to the ends of the stator winding 5 at an inclined angle, and the No. 1 oil hole of the second stator punching layer is located above the No. 4 oil hole of the first stator punching layer. Since the difference between the distance between the No. 1 oil hole and the central axis of the stator punching layer 3 and the distance between the No. 4 oil hole and the central axis of the stator punching layer 3 is relatively large, the second stator punching layer blocks the No. 4 oil hole of the first stator punching layer, and the corresponding stator axial oil hole cannot be sprayed. The oil in the oil channel 11 is led out, that is, a sub-oil hole group 32 with four sub-oil holes 321 is set. After the two stator punching layers 3 are rotated and stacked, three stepped oil channels 21 can be formed to communicate with the three stator axial oil channels 11. In order to achieve simultaneous conduction of the four stator axial oil channels 11, a plurality of sub-oil hole groups 32 that are rotationally displaced from each other can be set along the circumferential direction of the stator punching layer 3, such as setting two sub-oil hole groups 32, one of which can be deflected by three areas 33 relative to the other sub-oil hole group 32, so that each area 33 has two sub-oil holes 321, and the radial positions of the two sub-oil holes 321 in each area 33 are different and do not interfere with each other.At this time, after lamination in the above manner, six stepped oil passages 21 can be formed, ensuring that at least one stepped oil passage 21 can be formed in each corresponding area 33 of the two stator punching layers 3, that is, at least one of the two sub-oil holes 321 in each area 33 of each stator punching layer 3 is correspondingly connected to form a stepped oil passage 21, so that the oil in each stator axial oil passage 11 can be sprayed obliquely toward the end of the stator winding 5; and when the core end structure 2 is assembled with the stator core body 1, the distances of the sub-oil holes 321 constituting the stepped oil passage 21 from the central axis of the stator punching layer 3 decrease successively from the direction close to the core body 1 to the direction away from the core body 1, and the stepped oil passage 21 It is tilted roughly toward the central axis of the stator winding 5, so as to realize centripetal spraying of the stator winding 5; in summary, the stator core of this embodiment can form multiple oil channels spraying toward the stator winding 5, and the stator punching layer 3 of the core body 1 of the stator core and the stator punching layer 3 of the core end structure 2 are both composed of one or more stator punchings stacked, and the stator punchings used in the multiple stator punching layers 3 of the core body 1 and the core end structure 2 are the same, that is, the entire stator core is composed of the same stator punching stacked, and there is no need to develop multiple sets of stator punching molds, and there is no need to use additional parts such as oil rings and oil pipes, which can reduce the overall manufacturing cost of the motor. ,

[0034] like Figure 4 As shown, it can be understood that after the multiple stator punching sheet layers 3 of the core body 1 are stacked to form the core body 1 and the multiple stator punching sheet 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 grooves 311 of the multiple stator punching sheet layers 3 of the core end structure 2 are misaligned with the stator axial oil channels 11 of the core body 1 and will not be conductive, and the oil in the stator axial oil channels 11 of the core body 1 can only flow out through the stepped oil channels 21 of the core end structure 2.

[0035] It should be noted that the stator punching layer 3 is divided into four areas 33 along the circumferential direction, and the four areas 33 of the stator punching layer 3 along the circumferential direction are area No. 1, area No. 2, area No. 3 and area No. 4 respectively. The two sub-oil hole groups 32 are respectively the first sub-oil hole group and the second sub-oil hole. The second sub-oil hole group is deflected by three areas 33 along the circumferential direction of the stator punching layer 3 relative to the first sub-oil hole group. Among the sub-oil holes 321 of the first sub-oil hole group, the sub-oil hole 321 with the largest distance from the central axis of the stator punching layer 3 is located in area No. 1 of the stator punching layer 3, and the sub-oil holes 321 of the second sub-oil hole group are respectively located in area No. 1 of the stator punching layer 3. The sub-oil hole 321 with the largest distance from the central axis of the stator punching layer 3 is located in the fourth region of the stator punching layer 3. The distances of the four sub-oil holes 321 of the first sub-oil hole group from the central axis of the stator punching layer 3 decrease in the direction 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 central axis of the stator punching layer 3 decrease in the direction of the fourth, first, second and third regions. When the two stator punching layers 3 arranged from bottom to top, i.e., the first stator punching layer and the second stator punching layer, are stacked, the second region of the second stator punching layer can be rotated to the first region. The first stator sheet layer is located above the No. 1 area, and the second stator sheet layer is located above the No. 2 area of ​​the first stator sheet layer. The No. 4 area of ​​the second stator sheet layer is located above the No. 2 area of ​​the first stator sheet layer. The No. 1 area of ​​the second stator sheet layer is located above the No. 3 area of ​​the first stator sheet layer. Then, the two sub-oil holes in the No. 1 area of ​​the first stator sheet layer and the two sub-oil holes in the No. 2 area of ​​the second stator sheet layer are connected to form two stepped oil passages 21 to be connected to a stator axial oil passage 11. The two sub-oil holes in the No. 2 area of ​​the first stator sheet layer are connected to the two sub-oil holes in the No. 1 area of ​​the second stator sheet layer. The sub-oil holes are respectively connected with the two sub-oil holes 321 in the No. 3 area of ​​the second stator punching layer to form two stepped oil passages 21 to be connected with a stator axial oil passage 11; one of the sub-oil holes in the No. 3 area of ​​the first stator punching layer is connected with one of the sub-oil holes in the No. 4 area of ​​the second stator punching layer to form a stepped oil passage 21 to be connected with a stator axial oil passage 11; one of the sub-oil holes in the No. 4 area of ​​the first stator punching layer is connected with one of the sub-oil holes in the No. 1 area of ​​the second stator punching layer to form a stepped oil passage 21 to be connected with a stator axial oil passage 11.

[0036] Optionally, let 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 punching layers 3 of the core end structure 2 is N, then the number of sub-oil hole groups 32 of each stator punching layer 3 is X / (X+1-N), and the value is rounded up using the integer method. Taking one of the sub-oil hole groups 32 as a reference, the remaining sub-oil hole groups 32 are deflected in sequence along the circumferential direction of the stator punching layer 3 to N-1 regions 33 of the stator punching layer 3.

[0037] Specifically, when forming the core end structure, each stator punching layer 3 is always stacked in sequence according to the logic that the second sub-oil hole of the same sub-oil hole group is pressed on top of the first sub-oil hole, the third sub-oil hole is pressed on top of the second sub-oil hole, the fourth sub-oil hole is pressed on top of the third sub-oil hole... 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 punching layers 3 of the core end structure 2 is N, the N stator punching layers 3 can be stacked according to the above logic to form X+1-N stepped oil passages 21, that is, they can only be connected to X+1-N stator axial oil passages 11, and the oil groove group 31 of each stator punching layer 3 includes X oil grooves 311. After the multi-layer stator punching layers 3 of the core body 1 are stacked, X stator axial oil passages 11 can be formed. In order to ensure that X stator punching layers 3 are connected to each other, the oil groove group 31 of each stator punching layer 3 includes X oil grooves 311. The oil in the sub-axial oil channel 11 can be discharged through the corresponding stepped oil channel 21. A plurality of sub-oil hole groups 32 can be arranged along the circumferential rotation of the stator punching layer 3, and adjacent sub-oil hole groups 32 can be deflected by X+1-N regions along the circumferential direction of the stator punching layer 3. Therefore, a total of X / (X+1-N) sub-oil hole groups 32 need to be arranged. When calculating this value as a non-integer value, it needs to be rounded up to ensure that enough stepped oil channels 21 can be formed to smoothly discharge the oil in the corresponding stator axial oil channel 11.

[0039] like Figure 3-Figure 4 As shown, optionally, the core end structure 2 includes five rotated and stacked stator punching sheet layers 3, the oil hole group includes 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 include eight sub-oil holes 321, the second sub-oil hole group is deflected by four regions 33 along the circumferential direction of the stator punching sheet layer 3 relative to the first sub-oil hole group, and the five stator punching sheet layers 3 of the core end structure 2 are rotated and displaced in sequence by an angle equal to the angle spanned by two adjacent regions 33 of the stator punching sheet layer 3.

[0040] Specifically, when the sub-oil hole group 32 includes eight sub-oil holes 321, the stator punching layer 3 is provided with eight areas 33 along the circumferential direction, and the angle spanned by two adjacent areas 33 is 45°. The five stator punching layers 3 of the core end structure 2 are rotated and offset in sequence by the angle spanned by two adjacent areas 33 of the stator punching layer 3, that is, the five stator punching layers 3 are rotated and offset in sequence by 45° to form a stepped oil channel 21 extending in a stepped shape in the radial direction. The two sub-oil hole groups 32, that is, the first sub-oil hole group and the second sub-oil hole group, are relatively deflected by four areas 33, and the specific deflection angle can be 180°+α, where α is the relative deflection angle of the two sub-oil holes 321 in the same area.

[0041] like Figure 5As shown, the eight sub-oil holes 321 of each sub-oil hole group are sequentially No. 1 sub-oil hole 3211, No. 2 sub-oil hole 3212, No. 3 sub-oil hole 3213... No. 8 sub-oil hole 3218, and along the direction of No. 1 sub-oil hole 3211, No. 2 sub-oil hole 3212, No. 3 sub-oil hole 3213... No. 8 sub-oil hole 3218, the distance between the eight sub-oil holes 321 and the central axis of the stator punching layer 3 decreases sequentially; the core end structure 2 is formed by rotating and stacking five stator punching layers 3, and the five stator punching layers 3 are respectively the first stator punching layer, the second stator punching layer, and the second stator punching layer. The first sub-oil hole 3211 of the first sub-oil hole group is located in the first area 331, the second sub-oil hole 3212 is located in the second area 332, the third sub-oil hole 3213 is located in the third area 333, the fourth sub-oil hole 3214 is located in the fourth area 334, the fifth sub-oil hole 3215 is located in the fifth area 335, and the sixth sub-oil hole 3216 is located in the fifth area 336. The hole 3216 is located in the sixth area 336, the seventh sub-oil hole 3217 is located in the seventh area 337, and the eighth sub-oil hole 3218 is located in the eighth area 338; the first sub-oil hole 3211 of the second sub-oil hole group is located in the fifth area 335, the second sub-oil hole 3212 is located in the sixth area 336, the third sub-oil hole 3213 is located in the seventh area 337, the fourth sub-oil hole 3214 is located in the eighth area 338, the fifth sub-oil hole 3215 is located in the first area 331, the sixth sub-oil hole 3216 is located in the second area 332, and the seventh sub-oil hole 3217 is located in the eighth area 338. The No. 3 region 333 and the No. 8 oil hole 3218 are located in the No. 4 region 334. When the core end structure 2 is formed, the No. 2 region 332 of the second stator sheet layer can be pressed above the No. 1 region 331 of the first stator sheet layer, the No. 3 region 333 of the third stator sheet layer can be pressed above the No. 2 region 332 of the second stator sheet layer, the No. 4 region 334 of the fourth stator sheet layer can be pressed above the No. 3 region 333 of the third stator sheet layer, and the No. 5 region 335 of the fifth stator sheet layer can be pressed above the No. 4 region 334 of the fourth stator sheet layer.

[0042] At this time, the No. 1 sub-oil hole 3211 of the first sub-oil hole group of the first stator punching layer, the No. 2 sub-oil hole 3212 of the first sub-oil hole group of the second stator punching layer, the No. 3 sub-oil hole 3213 of the first sub-oil hole group of the third stator punching layer, the No. 4 sub-oil hole 3214 of the first sub-oil hole group of the fourth stator punching layer, and the No. 5 sub-oil hole 3215 of the first sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 21, and the No. 2 sub-oil hole 3212 of the first sub-oil hole group of the first stator punching layer, the No. 3 sub-oil hole 3213 of the first sub-oil hole group of the second stator punching layer, the No. 4 sub-oil hole 3214 of the first sub-oil hole group of the third stator punching layer, the No. 5 sub-oil hole 3215 of the first sub-oil hole group of the fourth stator punching layer, and the No. 6 sub-oil hole 3216 of the first sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 2 1. The third sub-oil hole 3213 of the first sub-oil hole group of the first stator punching layer, the fourth sub-oil hole 3214 of the first sub-oil hole group of the second stator punching layer, the fifth sub-oil hole 3215 of the first sub-oil hole group of the third stator punching layer, the sixth sub-oil hole 3216 of the first sub-oil hole group of the fourth stator punching layer, and the seventh sub-oil hole 3217 of the first sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 21, and the fourth sub-oil hole 3214 of the first sub-oil hole group of the first stator punching layer, the fifth sub-oil hole 3215 of the first sub-oil hole group of the second stator punching layer, the sixth sub-oil hole 3216 of the first sub-oil hole group of the third stator punching layer, the seventh sub-oil hole 3217 of the first sub-oil hole group of the fourth stator punching layer, and the eighth sub-oil hole 3218 of the first sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 21;

[0043] The first sub-oil hole 3211 of the second sub-oil hole group of the first stator punching layer, the second sub-oil hole 3212 of the second sub-oil hole group of the second stator punching layer, the third sub-oil hole 3213 of the second sub-oil hole group of the third stator punching layer, the fourth sub-oil hole 3214 of the second sub-oil hole group of the fourth stator punching layer, and the fifth sub-oil hole 3215 of the second sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 21, the second sub-oil hole 3212 of the second sub-oil hole group of the first stator punching layer, the third sub-oil hole 3213 of the second sub-oil hole group of the second stator punching layer, the fourth sub-oil hole 3214 of the second sub-oil hole group of the third stator punching layer, the fifth sub-oil hole 3215 of the second sub-oil hole group of the fourth stator punching layer, and the sixth sub-oil hole 3216 of the second sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 21, and the third sub-oil hole 3212 of the second sub-oil hole group of the first stator punching layer, the third sub-oil hole 3213 of the second sub-oil hole group of the second stator punching layer, the fourth sub-oil hole 3214 of the second sub-oil hole group of the third stator punching layer, the fifth sub-oil hole 3215 of the second sub-oil hole group of the fourth stator punching layer, and the sixth sub-oil hole 3216 of the second sub-oil hole group of the fifth stator punching layer are correspondingly connected to form a stepped oil passage 21. The sub-oil hole 3213, the fourth sub-oil hole 3214 of the second sub-oil hole group of the second stator punching layer, the fifth sub-oil hole 3215 of the second sub-oil hole group of the third stator punching layer, the sixth sub-oil hole 3216 of the second sub-oil hole group of the fourth stator punching layer, and the seventh sub-oil hole 3217 of the second sub-oil hole group of the fifth stator punching layer are connected to form a stepped oil passage 21, and the fourth sub-oil hole 3214 of the second sub-oil hole group of the eighth area 338 of the first stator punching layer, the fifth sub-oil hole 3215 of the second sub-oil hole group of the second stator punching layer, the sixth sub-oil hole 3216 of the second sub-oil hole group of the third stator punching layer, the seventh sub-oil hole 3217 of the second sub-oil hole group of the fourth stator punching layer, and the eighth sub-oil hole 3218 of the second sub-oil hole group of the fifth stator punching layer are connected to form a stepped oil passage 21, so that eight stepped oil passages 21 are formed along the circumference of the core end structure 2.

[0044] The number of the oil grooves 311 of the oil groove group 31 is consistent with the number of the sub-oil holes of the sub-oil hole group 32 , both of which are eight. Therefore, the eight oil grooves 311 of each stator punching layer 3 of the stator core body 1 are connected to each other to form eight stator axial oil passages 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, so as to realize the centripetal oil spraying to the end of the stator winding 5. Moreover, the core end structure 2 is formed by rotating and stacking five stator punching layers 3, so that the stepped oil passage 21 has a more suitable spraying angle. Of course, in some other embodiments, six or other numbers of stator punching layers 3 can also be used.

[0046] like Figure 6 As shown, optionally, the oil groove groups 31 and the oil hole groups are respectively provided with a plurality of corresponding ones, and based on one of the oil groove groups 31 and the oil hole groups, the remaining oil groove groups 31 and the oil hole groups are sequentially rotated and staggered along the circumferential direction of the stator punching layer 3.

[0047] For example, two oil groove groups 31 can be provided, and two oil hole groups can also be provided. Since the two oil groove groups 31 and the two oil hole groups are staggered along the circumferential rotation of the stator punching layer 3, when the multiple stator punching layers 3 of the core body 1 are stacked so that the oil grooves 311 of one of the oil groove groups 31 are correspondingly connected, the oil grooves 311 of the other oil groove group 31 are also correspondingly connected; when the multiple stator punching layers 3 of the core end structure 2 are stacked so that the sub-oil holes 321 of one of the oil hole groups are correspondingly connected, the sub-oil holes 321 of the other oil hole group can also be connected correspondingly.

[0048] In this embodiment, by providing a plurality of oil groove groups 31 and oil hole groups, it is possible to form more stator axial oil passages 11 in the circumferential direction of the stator core body 1 and more stepped oil passages 21 in the circumferential direction of the core end structure 2, thereby improving the cooling effect on the stator winding 5.

[0049] like Figure 5-6 As shown, optionally, the notch of the oil groove 311 is arranged in a direction away from the central axis of the stator punching layer 3. The notch of the oil groove 311 is arranged in a direction away from the central axis of the stator punching layer 3, that is, the multiple stator axial oil passages 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 passages 11 can form a chamber with the inner wall of the housing 4, so that the oil inlet 41 connected with the chamber is directly arranged on the housing 4 to realize the oil supply to the cooling oil passage of the stator winding 5.

[0050] Optionally, the stator punching layer 3 is provided with a plurality of winding slots 34 at intervals along its circumferential direction, and the winding slots 34 are located on the side of the oil slot 311 close to the central axis of the stator punching layer 3, and the span angle between two adjacent oil slots 311 of the oil slot group 31 is an integer multiple of the span angle between two adjacent winding slots 34.

[0051] Specifically, the winding slots 34 can be rectangular slots for accommodating stator windings. A plurality of winding slots 34 are circumferentially arranged on the stator sheet layer 3 , and the winding slots 34 are arranged close to the circumferential inner edge of the stator sheet layer 3 , and the oil slot group 31 and the oil hole group are arranged close to the circumferential outer edge of the stator sheet layer 3 .

[0052] In this embodiment, the spanning angle of two adjacent oil grooves 311 of the oil groove group 31 is an integer multiple of the spanning angle of two adjacent winding grooves 34. When the angle of rotation of each stator punching layer 3 is equal to the spanning angle of two adjacent areas 33 of the stator punching layer 3, that is, the angle of rotation of each stator punching layer 3 is equal to the spanning angle of two adjacent oil grooves 311 of the oil groove group 31, the winding grooves 34 of each stator punching layer 3 can be connected to each other, which is convenient for the installation of the stator winding 5.

[0053] Optionally, in the same area 33, multiple sub-oil holes 321 are all located on one side of the corresponding oil groove 311 along the circumferential direction of the stator punching layer 3. In this way, the oil groove 311 in the same area 33 and all the sub-oil holes 321 can form a large position difference along the circumference of the stator punching layer 3, avoiding that some sub-oil holes 321 are connected to the oil groove 311, so that the oil in the stator axial oil channel 11 is not only sprayed out from the stepped oil channel 21 of the core end structure 2, but also discharged from the oil groove 311 of each stator punching layer 3 of the core end structure 2 along the axial direction parallel to the stator core, and oil leakage occurs.

[0054] In addition, compared with setting the sub-oil hole 321 on the side of the oil groove 311 facing the central axis of the stator punching layer 3, the sub-oil hole 321 is located on the circumferential side of the oil groove 311 along the stator punching layer 3. On the one hand, it 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 be connected to each other. On the other hand, it can avoid the sub-oil hole 321 being too close to the winding slot 34, thereby avoiding the stator punching layer 3 from being weak in radial strength and causing fracture damage.

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

[0056] like Figure 2 and Figure 4 As shown, optionally, the core end structures 2 are respectively provided at the axial ends of the core body 1, and the two ends of the stator axial oil passage 11 are respectively connected to the corresponding stepped oil passages 21 of the two core end structures 2. The oil in the stator axial oil passage 11 can flow to the stepped oil passages 21 at the two ends respectively, so as to realize the centripetal oil cooling of the two ends of the stator winding 5.

[0057] like Figure 1-Figure 2 As shown, another embodiment of the present invention provides a motor, comprising the above-mentioned stator core. The advantages of the motor compared with the prior art are the same as those of the above-mentioned stator core, and will not be described again.

[0058] like Figure 1-Figure 2 As shown, optionally, the motor also includes a casing 4, which is sleeved on the outside of the stator core, and is provided with an oil inlet 41. The inner wall of the casing 4 is provided with an annular cavity 42 extending along its circumference at a position corresponding to the stator core body 1, and the annular cavity 42 is connected to the oil inlet 41 and each stator axial oil passage 11 of the stator core.

[0059] In this embodiment, the casing 4 can be a cylindrical structure. An annular cavity 42 is set on the inner wall of the casing 4 and at a position corresponding to the stator core body 1, so that the annular cavity 42 is connected to the stator axial oil channel 11. An oil inlet 41 connected to the annular cavity 42 is set on the casing 4, so that the oil entering the annular cavity 42 from the oil inlet 41 can flow to each stator axial oil channel 11 and spray toward the stator winding 5 from the stepped oil channel 21.

[0060] Another embodiment of the present invention provides a vehicle, comprising the above-mentioned motor. The advantages of the vehicle compared with the prior art are the same as those of the above-mentioned motor, and will not be described again.

[0061] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A stator core, characterized in that: The invention comprises an iron core body (1) and an iron core end structure (2) arranged at an axial end of the iron core body (1), wherein the iron core body (1) and the iron core end structure (2) both comprise a plurality of stator sheet layers (3), each of the stator sheet layers (3) being evenly divided along its circumference to form a plurality of regions (33), each of the stator sheet layers (3) being provided with an oil groove group (31) and an oil hole group, wherein the plurality of oil grooves (311) of the oil groove group (31) are spaced circumferentially from each other along the circumference of the stator sheet layer (3). The stator sheet layers (3) of the core body (1) are arranged at intervals and are respectively located in the corresponding areas (33); the stator sheet layers (3) of the core body (1) are mutually superimposed, and the multiple oil grooves (311) of each stator sheet layer (3) are respectively connected to each other to form multiple stator axial oil passages (11); the oil hole group comprises multiple sub-oil hole groups (32) arranged in a circumferential rotational staggered manner along the circumference of the stator sheet layer (3); the multiple sub-oil holes (321) of each sub-oil hole group (32) are arranged along the circumference of the stator sheet layer (3); The plurality of sub-oil holes (321) of the same sub-oil hole group (32) are arranged at intervals and are respectively located in the corresponding areas (33), and the distances between the plurality of sub-oil holes (321) and the central axis of the stator punching layer (3) are successively reduced, and the stator punching layers (3) of the core end structure (2) are rotated and stacked, and at least one sub-oil hole (321) of the plurality of stator punching layers (3) in each area (33) is correspondingly connected to form a stepped oil passage (21), which is arranged from close to the core body (1) to far away from the core body (1). In the direction of the core body (1), the distances between the oil holes (321) constituting the stepped oil passage (21) and the central axis of the stator punching layer (3) decrease successively, and the stepped oil passage (21) is connected to the corresponding stator axial oil passage (11); each stator punching layer (3) includes one stator punching or a plurality of stator punchings stacked in an aligned manner, and the stator punchings used in the core body (1) and the plurality of stator punching layers (3) of the core end structure (2) are all the same.

2. The stator core according to claim 1, characterized in that: Assume that 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 punching sheet layers (3) of the core end structure (2) is N. Then the number of sub-oil hole groups (32) of each stator punching sheet layer (3) is X / (X+1-N). The value is rounded to an integer. With one of the sub-oil hole groups (32) as a reference, the remaining sub-oil hole groups (32) are sequentially deflected along the circumferential direction of the stator punching sheet layer (3) to N-1 regions (33) of the stator punching sheet layer (3).

3. The stator core according to claim 2, characterized in that: The core end structure (2) comprises five rotationally stacked stator punching sheet layers (3), the oil hole group comprises 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 comprising eight sub-oil holes (321), the second sub-oil hole group being deflected by four regions (33) along the circumferential direction of the stator punching sheet layer (3) relative to the first sub-oil hole group, and the five stator punching sheet layers (3) of the core end structure (2) are rotated and displaced in sequence by an angle equal to an angle spanned by two adjacent regions (33) of the stator punching sheet layer (3).

4. The stator core according to claim 1, characterized in that: The oil groove groups (31) and the oil hole groups are respectively provided with a plurality of corresponding ones, and based on one of the oil groove groups (31) and the oil hole groups, the remaining oil groove groups (31) and the oil hole groups are sequentially rotated and staggered along the circumferential direction of the stator punching layer (3).

5. The stator core according to claim 1, characterized in that: The slot opening of the oil groove (311) is arranged in a direction away from the central axis of the stator sheet layer (3); and / or the stator sheet layer (3) is provided with a plurality of winding slots (34) at intervals along its circumference, the winding slots (34) being located on a side of the oil groove (311) close to the central axis of the stator sheet layer (3), and the span angle of two adjacent oil grooves (311) of the oil groove group (31) is an integer multiple of the span angle of two adjacent winding slots (34).

6. The stator core according to claim 1, characterized in that: In the same area (33), the plurality of sub-oil holes (321) are all located on one side of the corresponding oil groove (311) along the circumferential direction of the stator punching layer (3).

7. The stator core according to claim 1, characterized in that: The core end structures (2) are respectively provided at two axial ends of the core body (1), and the two ends of the stator axial oil passage (11) are respectively connected to the corresponding stepped oil passages (21) of the two core end structures (2).

8. A motor, characterized in that: It comprises the stator core as claimed in any one of claims 1 to 7.

9. The motor according to claim 8, characterized in that The invention also comprises a casing (4), wherein the casing (4) is sleeved on the outside of the stator core, an oil inlet (41) is provided on the casing (4), and an annular cavity (42) extending along the circumference of the inner wall of the casing (4) is provided at a position corresponding to the stator core body (1), and the annular cavity (42) is communicated with the oil inlet (41) and each stator axial oil passage (11) of the stator core.

10. A vehicle, characterized in that: Comprising a motor as described in any one of claims 8-9.

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