Stator assembly, motor and vehicle

Abstract

The invention discloses a stator assembly, a motor and a vehicle, the stator assembly comprises a plurality of sub-stators, the plurality of sub-stators are annularly arranged, each sub-stator comprises a winding and a stator iron core, the winding defines an accommodating groove extending along the axial direction of the stator assembly, the stator iron core is arranged in the accommodating groove, and the stator iron core is arranged in the accommodating groove along the radial direction of the stator assembly. The width sizes of the accommodating grooves are different, the inner wall surface of each accommodating groove comprises two first wall surfaces which are oppositely arranged along the width direction of the accommodating groove, the stator iron core of each sub-stator comprises a plurality of sub-iron cores which are arranged along the radial direction of the stator assembly, and the width sizes of at least part of the sub-iron cores in the same accommodating groove are different. The two sides of each sub-iron core in the width direction are provided with edges, and at least one edge of each sub-iron core abuts against the first wall face. According to the stator assembly provided by the embodiment of the invention, the space utilization rate in the accommodating groove can be improved, the overall magnetic flux area of the stator iron core can be effectively increased, and the magnetic flux of the stator assembly is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator assembly, an electric machine and a vehicle. BACKGROUND

[0002] In the related art, a stator assembly is usually composed of a winding and a stator core, wherein the stator core is assembled in an accommodating slot formed by the winding. However, due to the structure of the winding itself, the magnetic flux area of the stator core that can be placed in the accommodating slot is small, which is difficult to meet the demand of high magnetic flux of the stator assembly, and the space of the accommodating slot is not fully utilized, and there is a lot of redundant space. Therefore, how to improve the space utilization rate in the accommodating slot and increase the magnetic flux area of the stator core in the accommodating slot has become a technical problem to be solved. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a stator assembly, which has a high space utilization rate in the accommodating slot of the winding and a large magnetic flux area of the stator core as a whole, and can effectively improve the magnetic flux of the stator assembly.

[0004] The present application provides an electric machine comprising the above stator assembly.

[0005] The present application also provides a vehicle comprising the above electric machine.

[0006] According to the stator assembly of the first aspect of the present application, the stator assembly comprises a plurality of sub-stators, the plurality of sub-stators are arranged in a ring shape, each of the sub-stators comprises a winding and a stator core, the winding defines an accommodating slot extending in the axial direction of the stator assembly, the stator core is arranged in the accommodating slot, the width dimension of the accommodating slot is different in the radial direction of the stator assembly, the width dimension of the accommodating slot refers to the dimension of the accommodating slot in the circumferential direction of the stator assembly, and the inner wall surface of the accommodating slot comprises two first wall surfaces oppositely arranged in the width direction of the accommodating slot.

[0007] In the stator assembly, the stator core of each of the sub-stators comprises a plurality of sub-cores arranged in the radial direction of the stator assembly, the width dimension of at least part of the sub-cores in the same accommodating slot is different, the width dimension of the adjacent two sub-cores in the same accommodating slot is different, the width dimension of the sub-core refers to the dimension of the sub-core in the circumferential direction of the stator assembly, the sub-core has a ridge on both sides in the width direction of the sub-core, and at least one ridge of each of the sub-cores abuts against the first wall surface.

[0008] According to the stator assembly of the embodiment of the present application, by arranging at least part of the plurality of sub-cores in the same accommodating groove in the radial direction and with different width dimensions, the sub-cores with different width dimensions can be arranged in the regions with corresponding width dimensions, in the case of a certain internal space of the accommodating groove, the space inside the accommodating groove can be better filled with as many sub-cores as possible, the space utilization in the accommodating groove is improved, and by abutting at least one edge of each sub-core in the width direction against the first wall surface, the gap between the sub-cores and the first wall surface can be further reduced or eliminated, so that the width dimension of the sub-cores arranged in the regions with different width dimensions in the accommodating groove is as large as possible, which can effectively increase the magnetic flux area of the whole stator core, and further facilitate the improvement of the magnetic flux of the stator assembly.

[0009] According to some embodiments of the present application, each of the sub-cores comprises a plurality of silicon steel sheets stacked in the radial direction of the stator assembly in sequence, and the width dimensions of all the silicon steel sheets in the same sub-core are the same, the width dimension of the silicon steel sheet being the dimension of the silicon steel sheet in the circumferential direction of the stator assembly.

[0010] According to some embodiments of the present application, the thickness dimensions of all the silicon steel sheets in the same sub-core are the same.

[0011] According to some embodiments of the present application, the thickness dimensions of the silicon steel sheets of at least part of the sub-cores in the same accommodating groove are the same.

[0012] According to some embodiments of the present application, the number of the sub-cores in a single accommodating groove is 4-8.

[0013] According to some embodiments of the present application, the number of the sub-cores in a single accommodating groove is 6; and / or, the width dimensions of part of the sub-cores in the same accommodating groove are the same.

[0014] According to some embodiments of the present application, each of the sub-cores is the same; and / or, the thickness dimensions of at least part of the sub-cores in the same accommodating groove are different, the thickness dimension of the sub-core being the dimension of the sub-core in the radial direction of the stator assembly.

[0015] According to some embodiments of the present application, the middle position of the accommodating groove in the width direction is a groove middle, the thickness dimensions of at least part of the sub-cores increase in the direction from the first wall surface to the groove middle, the thickness dimension of the sub-core being the dimension of the sub-core in the radial direction of the stator assembly.

[0016] According to some embodiments of the present application, each of the sub-cores comprises a plurality of silicon steel sheets stacked in sequence along the radial direction of the stator assembly, and the middle position of the accommodating slot in the width direction is a slot middle, and the thickness dimension of at least part of the silicon steel sheets increases in the direction from the first wall surface to the slot middle.

[0017] According to some embodiments of the present application, each of the accommodating slots comprises, in the radial direction of the stator assembly and in the direction towards the radial outside, a first slot region, a second slot region and a third slot region arranged in sequence, the inner wall surface of the first slot region comprises two first arc wall surfaces oppositely arranged along the width direction of the first slot region, the inner wall surface of the second slot region comprises two straight wall surfaces oppositely arranged along the width direction of the second slot region, the inner wall surface of the third slot region comprises two second arc wall surfaces oppositely arranged along the width direction of the third slot region, and the first arc wall surfaces, the straight wall surfaces and the second arc wall surfaces on the same side are sequentially connected to form the first wall surface.

[0018] At least one of the sub-cores is arranged in each slot region, at least one edge of the sub-core in the first slot region abuts against the first arc wall surface, at least one edge of the sub-core in the second slot region abuts against the straight wall surface, and at least one edge of the sub-core in the third slot region abuts against the second arc wall surface.

[0019] According to some embodiments of the present application, in the same accommodating slot, the number of the sub-cores in the second slot region is greater than the number of the sub-cores in the first slot region and / or the third slot region.

[0020] According to some embodiments of the present application, one sub-core is arranged in the first slot region and / or the third slot region.

[0021] According to some embodiments of the present application, in the same accommodating slot, at least one sub-core in the first slot region is the same as at least one sub-core in the second slot region; and / or, in the same accommodating slot, at least one sub-core in the third slot region is the same as at least one sub-core in the second slot region.

[0022] According to some embodiments of the present application, a plurality of sub-cores are arranged in each of the second slot regions, in the same second slot region, the difference between the thickness dimension of the sub-core with the largest thickness dimension and the thickness dimension of the sub-core with the smallest thickness dimension is d1, the average of the thickness dimension of the sub-core with the largest thickness dimension and the thickness dimension of the sub-core with the smallest thickness dimension is d2, and d1 / d2≤10%, wherein the thickness dimension of the sub-core refers to the dimension of the sub-core in the radial direction of the stator assembly.

[0023] According to some embodiments of the present invention, within the same receiving slot, the absolute value of the difference between the thickness dimension of any of the sub-cores in the first slot region and / or the third slot region and the thickness dimension of the sub-core with the smallest thickness dimension in the second slot region is d3, and the thickness of the sub-core with the largest thickness dimension in the second slot region is d4. d3 and d4 satisfy: 30% ≤ d3 / d4 ≤ 50%. The thickness dimension of the sub-core refers to the dimension of the sub-core in the radial direction of the stator assembly.

[0024] An electric motor according to a second aspect of the present invention includes: a stator assembly according to the first aspect of the present invention described above.

[0025] According to the present invention, by providing the above-mentioned stator assembly, the magnetic flux area of ​​the stator core of the stator assembly can be effectively increased, which is beneficial to improving the overall magnetic flux area of ​​the stator assembly, thereby improving the performance and torque output level of the motor.

[0026] A vehicle according to a third aspect of the present invention includes: a motor according to the second aspect of the present invention described above.

[0027] The vehicle according to an embodiment of the present invention, by providing the above-described motor, is beneficial to improving the performance of the vehicle.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of a stator assembly according to some embodiments of the present invention;

[0031] Figure 2 yes Figure 1 A schematic diagram of the sub-stator in the stator assembly;

[0032] Figure 3 yes Figure 2 A schematic diagram of the stator from another angle;

[0033] Figure 4 yes Figure 3 Exploded view of the stator core in the stator;

[0034] Figure 5 yes Figure 2 A mathematical model for optimizing the magnetic flux area of ​​the stator core.

[0035] Reference Signs:

[0036] 100, stator assembly;

[0037] 10, sub-stator;

[0038] 1, stator core; 11, sub-core; 111, silicon steel sheet;

[0039] 2, winding; 21, accommodating slot; 21a, first wall surface; 211, first slot region; 2111, first arc wall surface; 212, second slot region; 2121, straight wall surface; 213, third slot region; 2131, second arc wall surface. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only for the purpose of explaining the present application, and cannot be understood as limiting the present application.

[0041] Reference Signs: Figures 1-4 A stator assembly 100 according to an embodiment of the present application is described below.

[0042] Reference Signs: Figures 1-4 The stator assembly 100 according to the first aspect embodiment of the present application includes a plurality of sub-stators 10, the plurality of sub-stators 10 are arranged in a ring shape, each sub-stator 10 includes a winding 2 and a stator core 1, the winding 2 defines an accommodating slot 21 extending along an axial direction of the stator assembly 100, the stator core 1 is arranged in the accommodating slot 21, the width dimension of the accommodating slot 21 is different along a radial direction of the stator assembly 100, the width dimension of the accommodating slot 21 refers to a dimension of the accommodating slot 21 in a circumferential direction of the stator assembly 100, and inner wall surfaces of the accommodating slot 21 include two first wall surfaces 21a oppositely arranged along a width direction of the accommodating slot 21.

[0043] The stator core 1 of each sub-stator 10 includes a plurality of sub-cores 11 arranged along a radial direction of the stator assembly 100, the width dimension of at least part of the sub-cores 11 in the same accommodating slot 21 is different, the width dimension of the adjacent two sub-cores 11 in the same accommodating slot 21 is different, the width dimension of the sub-core 11 refers to a dimension of the sub-core 11 in the circumferential direction of the stator assembly 100, and both sides of the sub-core 11 in the width direction have edges, and at least one edge of each sub-core 11 abuts against the first wall surface 21a.

[0044] The width dimensions of the at least part of the sub-cores 11 in the same accommodating groove 21 can be different, for example, the width dimensions of the part of the sub-cores 11 in the same accommodating groove 21 can be different, for another example, the width dimensions of all the sub-cores 11 in the same accommodating groove 21 can be different.

[0045] Due to the different width dimensions of the accommodating groove 21 along the radial direction, the width dimensions of the at least part of the plurality of sub-cores 11 arranged along the radial direction in the same accommodating groove 21 can be different, so that the width of the sub-cores 11 in the same accommodating groove 21 can be dynamically matched with the width of different regions in the accommodating groove 21, so as to better fill the space inside the accommodating groove 21 and reduce the redundant space in the accommodating groove 21.

[0046] For example, in the region with smaller width dimension of the accommodating groove 21, the sub-core 11 with smaller width dimension is arranged, and in the region with larger width dimension of the accommodating groove 21, the sub-core 11 with larger width dimension is arranged, compared with placing a plurality of sub-cores 11 with equal width in the accommodating groove 21, by the different width dimensions of the at least part of the sub-cores 11, the different width dimension regions in the accommodating groove 21 can be better adapted, so as to make full use of the space in the accommodating groove 21 and place as many sub-cores 11 as possible, thereby improving the space utilization rate in the accommodating groove 21.

[0047] In addition, by abutting the at least one edge of each sub-core 11 in the width direction with the first wall surface 21a, the gap between the sub-core 11 and the first wall surface 21a can be further reduced or eliminated, so that the width dimension of the sub-core 11 arranged in the region with different width dimensions in the accommodating groove 21 is as large as possible, which can effectively increase the magnetic flux area of the whole stator core 1, thereby facilitating the improvement of the magnetic flux of the stator assembly 100.

[0048] In the description of the present application, the meaning of "a plurality of" is two or more.

[0049] According to the stator assembly 100 of the embodiment of the present application, by the different width dimensions of the at least part of the plurality of sub-cores 11 arranged along the radial direction in the same accommodating groove 21, the sub-cores 11 with different width dimensions can be arranged in the region with corresponding width dimension, in the case that the internal space of the accommodating groove 21 is constant, the space inside the accommodating groove 21 can be better filled, as many sub-cores 11 as possible can be placed, and the space utilization rate in the accommodating groove 21 is improved, and by abutting the at least one edge of each sub-core 11 in the width direction with the first wall surface 21a, the gap between the sub-core 11 and the first wall surface 21a can be further reduced or eliminated, so that the width dimension of the sub-core 11 arranged in the region with different width dimensions in the accommodating groove 21 is as large as possible, which can effectively increase the magnetic flux area of the whole stator core 1, thereby facilitating the improvement of the magnetic flux of the stator assembly 100.

[0050] With reference to Figures 2-4 According to some embodiments of the present application, each sub-core 11 comprises a plurality of silicon steel sheets 111 stacked in sequence along the radial direction of the stator assembly 100, and the width dimensions of all the silicon steel sheets 111 in the same sub-core 11 are the same, where the width dimension of a silicon steel sheet 111 refers to the dimension of the silicon steel sheet 111 in the circumferential direction of the stator assembly 100. By making the width dimensions of all the silicon steel sheets 111 in the same sub-core 11 the same, the same set of stamping dies can be used to mass-produce all the silicon steel sheets 111 in the same sub-core 11, which is conducive to improving production efficiency and can also reduce the number of stamping dies and lower the cost of die development.

[0051] With reference to Figures 2-4 According to some embodiments of the present application, the thickness dimensions of all the silicon steel sheets 111 in the same sub-core 11 are the same, which can make the same set of stamping dies be used to mass-produce all the silicon steel sheets 111 in the same sub-core 11, which is conducive to improving production efficiency and can also reduce the number of stamping dies and lower the cost of die development.

[0052] With reference to Figures 2-4 According to some embodiments of the present application, the thickness dimensions of the silicon steel sheets 111 of at least some of the sub-cores 11 in the same receiving groove 21 are the same. For example, the thickness dimensions of the silicon steel sheets 111 of some of the sub-cores 11 in the same receiving groove 21 can be the same, or the thickness dimensions of the silicon steel sheets 111 of all the sub-cores 11 in the same receiving groove 21 can be the same.

[0053] By making the thickness dimensions of the silicon steel sheets 111 of at least some of the sub-cores 11 in the same receiving groove 21 the same, the silicon steel sheets 111 of at least some of the sub-cores 11 can be mass-produced, which effectively improves production efficiency and can also reduce the number of dies and lower the cost of die development.

[0054] For example, the silicon steel sheets 111 with the same thickness and width dimensions can be mass-produced using the same die, which can further reduce the number of dies, lower the cost of die development, and improve production efficiency.

[0055] With reference to Figures 2-4 According to some embodiments of the present application, the number of sub-cores 11 in a single receiving groove 21 is 4-8. For example, the number of sub-cores 11 in a single receiving groove 21 can be 4, 5, 6, 7, or 8.

[0056] The number of the sub-cores 11 in the single accommodating slot 21 is 4-8, so that the number of the sub-cores 11 with different width sizes can be more, the sub-cores 11 with corresponding width sizes are placed in the regions with different width sizes, the space utilization of the accommodating slot 21 is effectively improved, the magnetic flux area of the stator core 1 in the single accommodating slot 21 is increased, the number of the molds for manufacturing the sub-cores 11 is less, the mold development cost is reduced, and the mold cost is increased due to the excessive number of the sub-cores 11 is avoided.

[0057] With reference to Figures 2-4 According to some embodiments of the present application, the number of the sub-cores 11 in the single accommodating slot 21 is 6, so that the space utilization in the single accommodating slot 21 and the number of the molds are balanced, the sub-cores 11 with corresponding width sizes are placed in the regions with different width sizes, the space utilization of the accommodating slot 21 is effectively improved, and the number of the molds for manufacturing the sub-cores 11 is moderate, so that the mold development cost is reduced.

[0058] In addition, during the processing, each sub-core 11 needs to be positioned in the mold, and the number of the sub-cores 11 in the single accommodating slot 21 is 6, so that the positioning frequency is reduced and the production efficiency is improved.

[0059] With reference to Figures 2-4 According to some embodiments of the present application, the width sizes of the sub-cores 11 in the same accommodating slot 21 are the same. Since the sub-cores 11 are made of a plurality of stacked silicon steel sheets 111, the width sizes of the sub-cores 11 in the same accommodating slot 21 are the same, so that the number of the molds developed is reduced, for example, the silicon steel sheets 111 with the same thickness and width sizes can be manufactured in batches by using the same mold, the number of the molds is effectively reduced, the mold development cost is reduced, and the production efficiency of the stator core 1 is improved.

[0060] With reference to Figures 2-4 According to some embodiments of the present application, each sub-stator 10 is the same, and all the sub-stators 10 are completely the same, so that the batch production of the sub-stators 10 is realized, the stamping of the silicon steel sheets 111 and the stacking of the sub-cores 11 can be carried out in batches by using the same number and the same size of the molds, the production efficiency of the stator assembly 100 is improved, and the mold development cost is reduced.

[0061] With reference to Figures 2-4According to some embodiments of the present application, the thickness dimension of at least part of the sub-cores 11 in the same accommodating slot 21 is different, wherein the thickness dimension of the sub-cores 11 refers to the dimension of the sub-cores 11 in the radial direction of the stator assembly 100. For example, the thickness dimension of part of the sub-cores 11 in the same accommodating slot 21 can be different; for another example, the thickness dimension of all of the sub-cores 11 in the same accommodating slot 21 can be different.

[0062] Due to the different width dimensions of the accommodating slots 21 in the radial direction, by making the thickness dimension of at least part of the sub-cores 11 in the same accommodating slot 21 different, sub-cores 11 of different thicknesses can be placed according to the change of the width dimension of the accommodating slots 21, so that the sub-cores 11 of different dimensions can be placed more flexibly in the accommodating slots 21, to further improve the space utilization of the accommodating slots 21 and reduce the redundant space in the accommodating slots 21. For example, in the area where the width dimension of the accommodating slot 21 is smaller, the dimension in the radial direction can be smaller, and at this time, by placing the sub-cores 11 with smaller thickness dimension in this area, the space utilization of this part of the area can be improved, to further reduce the redundant space in the accommodating slots 21.

[0063] With reference to Figures 2-4 According to some embodiments of the present application, the middle position of the accommodating slot 21 in the width direction is the slot middle, and the thickness dimension of at least part of the sub-cores 11 increases in the direction from the first wall surface 21a to the slot middle, wherein the thickness dimension of the sub-cores 11 refers to the dimension of the sub-cores 11 in the radial direction of the stator assembly 100. For example, the thickness dimension of all of the sub-cores 11 in the direction from the first wall surface 21a to the slot middle can increase; for another example, the thickness dimension of part of the sub-cores 11 in the direction from the first wall surface 21a to the slot middle can increase.

[0064] The accommodating slots 21 are often in the form of narrow on both sides and wide in the middle in the width direction due to the winding of the windings 2, which makes the area close to the first wall surface 21a of the accommodating slot 21 in the width direction have smaller available space in the thickness direction, and the slot middle area has larger available space in the thickness direction. By making the thickness dimension of at least part of the sub-cores 11 increase in the direction from the first wall surface 21a to the slot middle, the space form of the accommodating slot 21 can be more accurately fitted, to further improve the space utilization of the accommodating slot 21 and reduce the redundant space in the accommodating slot 21.

[0065] With reference to Figures 2-4According to some embodiments of the present application, each sub-core 11 comprises a plurality of silicon steel sheets 111 stacked in sequence along the radial direction of the stator assembly 100, and the middle position of the width direction of the accommodating slot 21 is the slot middle, and the thickness dimension of at least part of the silicon steel sheets 111 increases in the direction from the first wall surface 21a to the slot middle. For example, the thickness dimension of part of the silicon steel sheets 111 in the sub-core 11 can increase in the direction from the first wall surface 21a to the slot middle; for another example, the thickness dimension of all the silicon steel sheets 111 in the sub-core 11 can increase in the direction from the first wall surface 21a to the slot middle.

[0066] By increasing the thickness dimension of at least part of the silicon steel sheets 111 in the direction from the first wall surface 21a to the slot middle, the thickness dimension of at least the sub-core 11 can increase in the direction from the first wall surface 21a to the slot middle, so as to more accurately fit the internal space of the accommodating slot 21 and effectively improve the space utilization of the accommodating slot 21.

[0067] Referring to Figure 5 According to some embodiments of the present application, along the radial direction of the stator assembly 100 and in the direction towards the radial outer side, each accommodating slot 21 comprises a first slot area 211, a second slot area 212 and a third slot area 213 arranged in sequence, the inner wall surface of the first slot area 211 comprises two first arc wall surfaces 2111 oppositely arranged along the width direction of the first slot area 211, the inner wall surface of the second slot area 212 comprises two straight wall surfaces 2121 oppositely arranged along the width direction of the second slot area 212, the inner wall surface of the third slot area 213 comprises two second arc wall surfaces 2131 oppositely arranged along the width direction of the third slot area 213, the first arc wall surfaces 2111, the straight wall surfaces 2121 and the second arc wall surfaces 2131 on the same side are sequentially connected to form the first wall surface 21a, at least one sub-core 11 is arranged in each slot area, at least one edge of the sub-core 11 located in the first slot area 211 abuts against the first arc wall surface 2111, at least one edge of the sub-core 11 located in the second slot area 212 abuts against the straight wall surface 2121, and at least one edge of the sub-core 11 located in the third slot area 213 abuts against the second arc wall surface 2131.

[0068] It should be explained that the straight wall surface 2121 is a plane.

[0069] Since the inner wall surface of the first slot area 211 in the width direction is the first circular arc wall surface 2111, the space at the first slot area 211 is relatively narrow. By abutting at least one edge of the sub-core 11 located at the first slot area 211 against the first circular arc wall surface 2111, the width dimension of the sub-core 11 in the first slot area 211 can be as large as possible, so as to reduce the redundant space in the first slot area 211 as much as possible, improve the space utilization in the first slot area 211, and also make the magnetic flux area of the sub-core 11 in the first slot area 211 as large as possible.

[0070] By abutting at least one edge of the sub-core 11 located at the second slot area 212 against the second slot area 212, the width dimension of the sub-core 11 in the second slot area 212 can be as large as possible, so as to reduce the redundant space in the second slot area 212 as much as possible, improve the space utilization in the second slot area 212, and also make the magnetic flux area of the sub-core 11 in the second slot area 212 as large as possible.

[0071] Since the inner wall surface of the third slot area 213 in the width direction is the second circular arc wall surface 2131, the space at the third slot area 213 is relatively narrow. By abutting at least one edge of the sub-core 11 located at the third slot area 213 against the second circular arc wall surface 2131, the width dimension of the sub-core 11 in the third slot area 213 can be as large as possible, so as to reduce the redundant space in the third slot area 213 as much as possible, improve the space utilization in the third slot area 213, and also make the magnetic flux area of the sub-core 11 in the third slot area 213 as large as possible.

[0072] By partitioning the accommodating slot 21, placing the sub-core 11 with a corresponding width dimension in each slot area according to the space of each slot area, the space utilization in each slot area can be improved, and the magnetic flux area of the sub-core 11 in each slot area can be as large as possible. In this way, the overall space utilization of the accommodating slot 21 can be effectively improved, and the overall magnetic flux area of the stator core 1 can be effectively increased.

[0073] Referring to Figure 5 , Figure 5 For the magnetic flux area optimization mathematical model of the stator core 1 in a single accommodating slot 21 according to some embodiments of the present application, in the embodiment, the stator core 1 is stacked by n sub-cores 11 with different width dimensions, Figures 2-4 The core close to the radial inner side of the accommodating slot 21 is the first core, and the core close to the radial outer side of the accommodating slot 21 is the n-th core. At least one edge of the first core to the N-1-th core in the width direction abuts against the first wall surface 21a. The coordinates of the thickness dimensions of the first core to the n-th core in the radial direction are x1, x2, …, xn respectively. n , x n+1 Correspondingly, the area of each sub-core 11 is S1, S2, …, Sn. nThe function expression of the magnetic flux area of the stator core 1 in the single accommodating slot 21 is as follows:

[0074]

[0075] wherein S represents the sum of the magnetic flux areas of the stator core 1 in the single accommodating slot 21, a, b, h and r are structure parameters, which can be given according to the actual design space, θ1 is half of the radian of the first arc wall surface 2111, and θ2 is half of the radian of the second arc wall surface 2131, so that the stator core 11 can better fit the first arc wall surface 2111 and the second arc wall surface 2131, so as to fully utilize the space of the circular corner in the accommodating slot 21, and compared with the core scheme in which the width dimension of the stator core 11 gradually decreases along the radial direction, the magnetic flux area of the stator core 1 can be effectively increased.

[0076] Of course, θ1 and θ2 can also be given according to the actual structure design, for example, θ1 and θ2 of the designed 16P24S axial flux motor are 11p / 48 and 13p / 48 respectively.

[0077] With reference to Figures 2-4 According to some embodiments of the present application, the number of the stator core 11 in the second slot area 212 is greater than that in the first slot area 211 and / or the third slot area 213 in the same accommodating slot 21. The second slot area 212 is located in the middle of the accommodating slot 21 in the radial direction, and the inner wall surface of the second slot area 212 in the width direction is a straight wall surface 2121, which makes the available space in the second slot area 212 greater than that in the first slot area 211 and the third slot area 213, and the straight wall surface 2121 of the second slot area 212 extends obliquely from the radial inner side to the radial outer side, so that the width dimension of the second slot area 212 gradually increases in the direction from the radial inner side to the radial outer side. By increasing the number of the stator core 11 in the second slot area 212, the space in the second slot area 212 can be fully utilized, so that the stator core 11 with different width dimensions can better adapt to the width change in the second slot area 212, so as to improve the space utilization rate in the second slot area 212, reduce the redundant space in the second slot area 212, and the number of the stator core 11 in the second slot area 212 is greater, which can also increase the total magnetic flux area of the stator core 11 in the second slot area 212.

[0078] With reference to Figures 2-4According to some embodiments of the present application, at least one sub-core 11 is arranged in the first slot area 211 and / or the third slot area 213. The at least one sub-core 11 arranged in the first slot area 211 and / or the third slot area 213 includes the following three cases: for example, at least one sub-core 11 is arranged in the first slot area 211; for another example, at least one sub-core 11 is arranged in the third slot area 213; for yet another example, at least one sub-core 11 is arranged in both the first slot area 211 and the third slot area 213.

[0079] By arranging at least one sub-core 11 in the first slot area 211 and / or the third slot area 213, the total number of sub-cores 11 can be reduced, and thus the number of molds can be reduced to reduce the mold development cost.

[0080] With reference to Figures 2-4 According to some embodiments of the present application, at least one sub-core 11 of the first slot area 211 in the same accommodating slot 21 is the same as at least one sub-core 11 of the second slot area 212. It needs to be explained that the same sub-core 11 means that the width size and the thickness size are the same. By arranging at least one sub-core 11 of the first slot area 211 in the same accommodating slot 21 as at least one sub-core 11 of the second slot area 212, the total number of sub-cores 11 can be reduced, and thus the number of molds can be reduced to reduce the mold development cost.

[0081] With reference to Figures 2-4 According to some embodiments of the present application, at least one sub-core 11 of the third slot area 213 in the same accommodating slot 21 is the same as at least one sub-core 11 of the second slot area 212. By arranging at least one sub-core 11 of the third slot area 213 in the same accommodating slot 21 as at least one sub-core 11 of the second slot area 212, the total number of sub-cores 11 can be reduced, and thus the number of molds can be reduced to reduce the mold development cost.

[0082] With reference to Figures 2-4 According to some embodiments of the present application, a plurality of sub-cores 11 are arranged in each second slot area 212, and the difference between the thickness size of the sub-core 11 with the largest thickness size and the thickness size of the sub-core 11 with the smallest thickness size in the same second slot area 212 is d1, and the average of the thickness size of the sub-core 11 with the largest thickness size and the thickness size of the sub-core 11 with the smallest thickness size is d2, and d1, d2 satisfy: d1 / d2≤10%, the thickness size of the sub-core 11 refers to the size of the sub-core 11 in the radial direction of the stator assembly 100. For example, d1 / d2 can be 1%, 2%, 5%, 7%, 10%, etc.

[0083] The d1 and d2 satisfy d1 / d2≤10%, which makes the thickness dimension of the sub-iron cores 11 in the second slot area 212 smaller, so as to adapt to the area where the size of the straight wall surface 2121 changes less, and makes the redundant space between each sub-iron core 11 and the straight wall surface 2121 in the second slot area 212 smaller, so as to make full use of the space in the second slot area 212, and make the magnetic flux area of the sub-iron cores 11 in the second slot area 212 larger.

[0084] With reference to Figure 1 According to some embodiments of the present application, in the same accommodating slot 21, the absolute value of the difference between the thickness dimension of any one of the sub-iron cores 11 in the first slot area 211 and / or the third slot area 213 and the thickness dimension of the sub-iron core 11 with the smallest thickness dimension in the second slot area 212 is d3, and the thickness of the sub-iron core 11 with the largest thickness dimension in the second slot area 212 is d4, d3 and d4 satisfy 30%≤d3 / d4≤50%, and the thickness dimension of the sub-iron core 11 refers to the dimension of the sub-iron core 11 in the radial direction of the stator assembly 100. For example, d3 / d4 can be 30%, 35%, 40%, 45%, 50%, etc.

[0085] Since the inner wall surface of the first slot area 211 in the width direction is the first circular arc wall surface 2111, the inner wall surface of the second slot area 212 in the width direction is the straight wall surface 2121, and the inner wall surface of the third slot area 213 in the width direction is the second circular arc wall surface 2131, the curvature change between the first circular arc wall surface 2111 and the second circular arc wall surface 2131 and the straight wall surface 2121 is large, and d3 and d4 satisfy 30%≤d3 / d4≤50%, which can make the thickness dimension of the sub-iron cores 11 in the first slot area 211 and / or the third slot area 213 deviate greatly from the thickness dimension of the sub-iron cores 11 in the second slot area 212, so that the sub-iron cores 11 in the first slot area 211 and / or the third slot area 213 can better adapt to the changes at the junctions of the first slot area 211 and / or the third slot area 213 and the second slot area 212, so as to make full use of the space in the accommodating slot 21, and make the magnetic flux area of the stator iron core 1 larger.

[0086] With reference to ​ According to the motor of the second aspect embodiment of the present application, the motor comprises the stator assembly 100 according to the first aspect embodiment of the present application.

[0087] According to the motor of the embodiment of the present application, by being provided with the stator assembly 100, the magnetic flux area of the stator iron core 1 of the stator assembly 100 is effectively increased, which is beneficial to increasing the magnetic flux area of the stator assembly 100 as a whole, thereby being beneficial to improving the performance and torque output level of the motor.

[0088] According to the vehicle of the third aspect embodiment of the present application, the vehicle comprises the motor according to the second aspect embodiment of the present application.

[0089] According to the vehicle of the embodiment of the present application, the performance of the vehicle is improved by the motor.

[0090] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0091] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0092] In the description of the present application, "above" or "below" the first feature in relation to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0093] In the description of the present application, "above", "over" and "on" the first feature in relation to the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in level than the second feature.

[0094] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0095] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stator assembly characterized by, The application relates to a stator assembly. The stator assembly comprises a plurality of sub-stators arranged in a ring shape, each of the sub-stators comprising a winding and a stator core, the winding defining a receiving slot extending in an axial direction of the stator assembly, the stator core being arranged in the receiving slot, the width dimension of the receiving slot being different in a radial direction of the stator assembly, the width dimension of the receiving slot being a dimension of the receiving slot in a circumferential direction of the stator assembly, and the inner wall surface of the receiving slot comprising two first wall surfaces oppositely arranged in the width direction of the receiving slot. The stator core of each of the sub-stators comprises a plurality of sub-cores arranged in the radial direction of the stator assembly, the width dimension of at least part of the sub-cores in the same receiving slot being different, the width dimension of the adjacent two sub-cores in the same receiving slot being different, the width dimension of the sub-core being a dimension of the sub-core in the circumferential direction of the stator assembly, the sub-core having an edge on each side in the width direction of the sub-core, and at least one edge of each of the sub-cores being in abutment with the first wall surface.

2. The stator assembly of claim 1, wherein, Each of the sub-cores comprises a plurality of silicon steel sheets sequentially stacked in the radial direction of the stator assembly, the width dimension of all the silicon steel sheets in the same sub-core being the same, the width dimension of the silicon steel sheet being a dimension of the silicon steel sheet in the circumferential direction of the stator assembly.

3. The stator assembly of claim 2, wherein, The thickness dimension of all the silicon steel sheets in the same sub-core is the same.

4. The stator assembly of claim 3, wherein, The thickness dimension of the silicon steel sheets of at least part of the sub-cores in the same receiving slot is the same.

5. The stator assembly of claim 1, wherein, The number of the sub-cores in a single receiving slot is 4-8.

6. The stator assembly of claim 5, wherein, The number of the sub-cores in a single receiving slot is 6; and / or, the width dimension of part of the sub-cores in the same receiving slot is the same.

7. The stator assembly of claim 1, wherein, Each of the sub-stators is the same; and / or, the thickness dimension of at least part of the sub-cores in the same receiving slot is different, the thickness dimension of the sub-core being a dimension of the sub-core in the radial direction of the stator assembly.

8. The stator assembly of claim 1, wherein, The middle position of the width direction of the receiving slot is a slot middle, the thickness dimension of at least part of the sub-cores increasing in a direction from the first wall surface to the slot middle, the thickness dimension of the sub-core being a dimension of the sub-core in the radial direction of the stator assembly.

9. The stator assembly of claim 8, wherein, Each of the sub-cores comprises a plurality of silicon steel sheets sequentially stacked in the radial direction of the stator assembly, the middle position of the width direction of the receiving slot being a slot middle, and the thickness dimension of at least part of the silicon steel sheets increasing in a direction from the first wall surface to the slot middle.

10. The stator assembly of any one of claims 1-9, wherein, Each of the accommodating grooves comprises, in a radial direction of the stator assembly and in a direction towards a radial outer side, a first groove section, a second groove section and a third groove section arranged in sequence, an inner wall surface of the first groove section comprises two first arc wall surfaces oppositely arranged in a width direction of the first groove section, an inner wall surface of the second groove section comprises two straight wall surfaces oppositely arranged in a width direction of the second groove section, and an inner wall surface of the third groove section comprises two second arc wall surfaces oppositely arranged in a width direction of the third groove section, the first arc wall surfaces, the straight wall surfaces and the second arc wall surfaces on the same side are sequentially connected to form the first wall surface. At least one of the sub-cores is arranged in each groove section, at least one edge of the sub-core arranged in the first groove section abuts against the first arc wall surface, at least one edge of the sub-core arranged in the second groove section abuts against the straight wall surface, and at least one edge of the sub-core arranged in the third groove section abuts against the second arc wall surface.

11. The stator assembly of claim 10, wherein, In the same accommodating groove, the number of the sub-cores arranged in the second groove section is greater than the number of the sub-cores arranged in the first groove section and / or the third groove section.

12. The stator assembly of claim 10, wherein, One of the sub-cores is arranged in the first groove section and / or the third groove section.

13. The stator assembly of claim 10, wherein, In the same accommodating groove, at least one of the sub-cores arranged in the first groove section is identical to at least one of the sub-cores arranged in the second groove section. In the same accommodating groove, at least one of the sub-cores arranged in the third groove section is identical to at least one of the sub-cores arranged in the second groove section.

14. The stator assembly of claim 10, wherein, A plurality of the sub-cores are arranged in each of the second groove sections, in the same second groove section, a difference between a thickness dimension of a sub-core with a largest thickness dimension and a thickness dimension of a sub-core with a smallest thickness dimension is d1, an average of the thickness dimension of the sub-core with the largest thickness dimension and the thickness dimension of the sub-core with the smallest thickness dimension is d2, and d1 / d2≤10%, the thickness dimension of the sub-core refers to a dimension of the sub-core in the radial direction of the stator assembly.

15. The stator assembly of claim 10, wherein, In the same accommodating groove, an absolute value of a difference between a thickness dimension of any one of the sub-cores arranged in the first groove section and / or the third groove section and a thickness dimension of a sub-core with a smallest thickness dimension arranged in the second groove section is d3, a thickness of a sub-core with a largest thickness dimension arranged in the second groove section is d4, and 30%≤d3 / d4≤50%, the thickness dimension of the sub-core refers to a dimension of the sub-core in the radial direction of the stator assembly.

16. An electric machine characterized by The stator assembly according to any one of claims 1-15. The motor according to claim 16.

17. A vehicle characterized by comprising: The motor according to claim 16. ​

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