Stator core, stator assembly and motor

Abstract

The invention relates to a stator core, a stator assembly and a motor. An inlet flow channel and at least one flow channel area group communicated with the inlet flow channel are arranged on the peripheral surface of the stator core, the flow channel area group comprises a plurality of flow channel areas, and each flow channel area is provided with an inlet communicated with the inlet flow channel and an outlet used for discharging a cooling medium from the inlet flow channel to the outer side of the stator core; each flow channel region further comprises a plurality of flow channel sections, and every two adjacent flow channel sections are communicated with each other through a connecting section, so that the cooling medium is allowed to continuously flow through the plurality of flow channel sections of the flow channel region from the inlet of the flow channel region and finally flow out of the stator iron core through the outlet of the flow channel region. According to the stator iron core, the cooling medium can be continuously contacted with the stator iron core in the flowing process so as to effectively cool the stator iron core, the manufacturing cost of the stator iron core is effectively reduced, and the cooling effect is enhanced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a stator core, a stator assembly including the stator core, and a motor including the stator core or the stator assembly. Background Technology

[0002] In the field of new energy vehicles, electric motors, as one of the core components of the power system, are often widely used in various actuators to provide the power required to achieve the corresponding functions. The basic principle is to convert electrical energy into mechanical energy using the principle of electromagnetic induction.

[0003] An electric motor mainly consists of a stator and a rotor. The stator may include a stator core and stator windings, while the rotor may include a rotor shaft, rotor core, and rotor windings (or permanent magnets). When current flows through the stator windings, a rotating magnetic field is generated in the stator core. This rotating magnetic field induces a rotor magnetic field in the rotor windings, causing the rotor assembly to rotate, thereby converting electrical energy into mechanical energy. Electric motors generate a significant amount of heat during operation, making effective cooling of all motor components (including the stator core and stator windings) extremely important.

[0004] Oil cooling is a known method for cooling motors in the prior art. For example, one known scheme uses axial DC or offset turbulence to cool the stator core and stator windings. However, this cooling method has high material costs, complex processes, is prone to oil channel blockage (difficult to identify), and has poor continuous cooling performance. Therefore, there is a need to propose an improved cooling structure for motors. Summary of the Invention

[0005] This invention is proposed against this background, and its purpose is to provide an improved stator core, stator assembly and motor structure that can overcome one or more of the above-mentioned problems in the prior art.

[0006] According to one aspect of the invention, a stator core is provided, wherein the stator core has an inlet channel for the inflow of a cooling medium and at least one group of channel regions communicating with the inlet channel on its outer peripheral surface, the group of channel regions comprising a plurality of channel regions, wherein each channel region is provided with an inlet communicating with the inlet channel and an outlet for discharging the cooling medium from the inlet channel to the outside of the stator core; each channel region further comprises a plurality of channel segments, every two adjacent channel segments being connected to each other by a connecting segment, such that the cooling medium can flow continuously from the inlet channel through the inlet of the channel region through the plurality of channel segments of the channel region and finally flow out of the stator core through the outlet of the channel region.

[0007] Advantageously, in each flow channel region, the connecting sections for connecting every two adjacent flow channel sections are arranged in an alternating manner to allow for continuous changes in the flow direction of the cooling medium in each flow channel section.

[0008] Advantageously, the inlet channel is located at the middle position of the outer peripheral surface of the stator core, and the stator core includes two groups of channel regions symmetrically arranged on both sides of the inlet channel.

[0009] Advantageously, the stator core is composed of two halves arranged symmetrically to each other, each half being formed by multiple lamination groups stacked together and defining an inlet channel and a channel region group for the half.

[0010] Advantageously, each half consists of multiple stacked groups composed of four or fewer different types of stacked sheets.

[0011] Advantageously, each half includes a first lamination group, two second lamination groups, two third lamination groups, and a fourth lamination group arranged coaxially; wherein the first lamination group forms a plurality of axially extending flow channel segments of a corresponding flow channel region group on its outer periphery; the two second lamination groups are respectively disposed on opposite sides of the first lamination group in the circumferential direction at an angle relative to each other, thereby forming a connecting segment on the side closer to the inlet flow channel and a connecting segment on the side farther from the inlet flow channel; the two third lamination groups are respectively disposed on an axial side of the corresponding second lamination group away from the first lamination group, such that the two third lamination groups respectively form the inlet and outlet of each flow channel region in the corresponding flow channel region group; and the fourth lamination group is disposed on an axial side of the third lamination group forming the inlet away from the corresponding second lamination group, so as to form half of the inlet flow channel.

[0012] Advantageously, the first stack group includes a plurality of first type stacks arranged in a stacked manner. The first type stack includes a first outer peripheral section in an annular shape and a plurality of first toothed sections extending radially inward on the inner periphery of the first outer peripheral section. The outer periphery of the first outer peripheral section is provided with a plurality of equally spaced first toothed grooves, thereby forming an axially extending flow channel section in the corresponding flow channel region group when the plurality of first type stacks are stacked.

[0013] Advantageously, each second stack includes a plurality of second-type stacks arranged in a stacked manner. Each second-type stack includes a second outer peripheral section in an annular shape and a plurality of second toothed sections extending radially inward along the inner periphery of the second outer peripheral section. The outer periphery of the second outer peripheral section is provided with a plurality of sets of second toothed grooves. Each set of second toothed grooves includes a flow passage toothed groove and a plurality of flow channel toothed grooves. Thus, when the plurality of second-type stacks are stacked, the stacked flow channel toothed grooves form a connecting section in the corresponding flow channel region and the stacked flow passage toothed grooves form an outlet section in the corresponding flow channel region that communicates with the outlet or an inlet section that communicates with the inlet.

[0014] Advantageously, the width of the flow passage groove is smaller than the width of the flow channel groove.

[0015] Advantageously, each third stack includes a plurality of third-type stacks arranged in a stacked manner, each of the third-type stacks including a third outer peripheral segment in an annular shape and a plurality of third tooth segments extending radially inward from the inner periphery of the third outer peripheral segment, the outer periphery of the third outer peripheral segment being provided with a plurality of third tooth grooves, thereby forming an outlet or inlet in the corresponding flow channel region by the stacked third tooth grooves when the plurality of third-type stacks are stacked.

[0016] Advantageously, the fourth lamination group includes a plurality of fourth-type laminations stacked together, each fourth-type lamination including an annular fourth peripheral segment and a plurality of fourth tooth segments extending radially inward from the inner periphery of the fourth peripheral segment, the outer diameter of the fourth peripheral segment being smaller than the outer diameter of the third peripheral segment of the third-type lamination, thereby defining a recessed region to form half of the inlet channel when the plurality of fourth-type laminations are stacked and assembled together with other lamination groups into a half.

[0017] According to a second aspect of the invention, a stator assembly is provided, the stator assembly comprising a stator core as described above.

[0018] According to a third aspect of the invention, an electric motor is provided, the electric motor comprising a stator core as described above or a stator assembly as described above.

[0019] Compared with the prior art, the stator core, stator assembly and motor according to the present invention can achieve at least one of the following technical effects: a group of flow channel regions, which are connected to the flow channel on one or both sides and are composed of multiple flow channel regions, is provided, so that the entire outer peripheral surface of the stator core is covered with flow channels for the cooling medium to flow through, which greatly improves the cooling efficiency; each flow channel region includes multiple flow channel sections and multiple connecting sections that are connected to each other, and the multiple flow channel sections are connected end to end, so that the flow direction of the cooling medium can be continuously changed to form an annular cooling channel, so that the cooling medium can continuously contact the stator core during the flow process to achieve effective cooling of the stator core; in addition, the manufacturing cost of the stator core can also be effectively reduced. Attached Figure Description

[0020] The above and other features and advantages of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:

[0021] Figure 1 A perspective view of the stator core of an electric motor according to an embodiment of the present invention is shown;

[0022] Figure 2 It shows Figure 1 The stator core shown includes one flow channel region and the corresponding partitions of the first to fourth lamination groups in that flow channel region;

[0023] Figure 3 It shows Figure 1 An exploded view of one half of the stator core shown;

[0024] Figure 4 A schematic diagram of a first type of laminate constituting the first laminate group is shown;

[0025] Figure 5 A schematic diagram of a second type of laminate constituting a second laminate group is shown;

[0026] Figure 6 A schematic diagram of the third type of lamination constituting the third lamination group is shown; and

[0027] Figure 7 A schematic diagram of the fourth type of laminations constituting the fourth lamination group is shown.

[0028] All accompanying drawings are schematic only and are not necessarily drawn to scale. Furthermore, they only show those parts necessary to illustrate the invention; other parts are omitted or merely mentioned. That is, the invention may include other parts besides those shown in the drawings.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Inlet flow channel; 2. Flow channel region group; 21. Flow channel region; 211. Inlet; 212. Outlet; 213. Flow channel section; 214. Connecting section; 215. Outlet section; 216. Inlet section; 3. Half section; 4. First lamination group; 41. First type lamination; 411. First outer peripheral section; 412. First tooth section; 413. First tooth groove; 5. Second lamination group; 51. Second type Type 6, third lamination group; 511, second outer peripheral section; 512, second tooth section; 513, second tooth groove; 5131, flow tooth groove; 5132, flow channel tooth groove; 6, third lamination group; 61, third type lamination; 611, third outer peripheral section; 612, third tooth section; 613, third tooth groove; 7, fourth lamination group; 71, fourth type lamination; 711, fourth outer peripheral section; 712, fourth tooth section. Detailed Implementation

[0031] In the following description, numerous specific details are set forth to enable those skilled in the art to fully understand the invention. However, it will be apparent to those skilled in the art that implementation of the invention may not include some of these specific details. The various aspects, features, embodiments, and advantages described below are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims. Terms such as "first," "second," etc., are used hereinafter to describe elements of this application; these terms are used only to distinguish individual elements and are not intended to limit the nature, sequence, order, or number of these elements. Furthermore, it should be noted that in this specification, identical and / or functionally identical technical features are represented by the same or similar reference numerals.

[0032] As mentioned in the background section, various solutions exist in the prior art for cooling the stator core and stator windings in an electric motor. These solutions include using axial DC or offset turbulence in the core and / or adding oil ring structures at both ends of the stator core. However, these solutions typically have high material costs and poor cooling performance.

[0033] Therefore, this invention proposes an improved solution that enables simple and efficient cooling of the stator core and stator windings, while also greatly simplifying the processing and assembly of the stator core.

[0034] The stator core according to an embodiment of the present invention, see [link / reference]. Figure 1 and Figure 2The diagram illustrates, in both perspective and planar views, an embodiment of the present invention, a stator core and an inlet channel 1 and a channel region group 2 disposed on the outer circumferential surface of the stator core. The inlet channel 1 surrounds the outer circumference of the stator core, and the channel region group 2 is disposed on one axial side of the inlet channel 1 and is in fluid communication with the inlet channel 1. The channel region group 2 may include a plurality of channel regions 21 disposed at intervals (preferably equally spaced) along the circumference of the stator core. Each channel region 21 may be provided with an inlet 211 communicating with the inlet channel 1, such that the channel region group 2 can communicate with the inlet channel 1 through multiple inlets 211. Each channel region 21 may also be provided with an outlet 212 near the outer side of the stator core (i.e., the side of the channel region group 2 opposite to the inlet channel 1). Cooling medium (such as cooling oil) flows into the inlet channel 1, enters each channel region 21 through the inlet 211, and exits the stator core through the outlet 212. Thus, by having the cooling medium flow through multiple flow channel regions in the flow channel region group, effective cooling of the stator core is achieved.

[0035] Optionally, refer to Figure 2 As shown, each flow channel region 21 may include multiple flow channel segments 213 and multiple connecting segments 214. These flow channel segments 213 may be arranged in parallel, staggered, or in a manner that meets actual needs, preferably as shown in the figure. Figure 2 The parallel arrangement is shown. Each pair of adjacent flow channel sections 213 is connected to each other by a connecting section 214.

[0036] See also Figure 2 Multiple flow channel sections 213 (such as Figure 2 The eleven flow channel segments 213 shown in the example are arranged in parallel at intervals, each flow channel segment 213 extending along the axial direction of the stator core (i.e., the vertical direction in the figure). Adjacent connecting segments 214 are arranged in an alternating manner. For example, Figure 2 One flow channel section 213 is connected to the flow channel section 213 adjacent to it on one side at the upper end by a connecting section 214, and is connected to the flow channel section 213 adjacent to it on the other side at the lower end by another connecting section 214. In this way, the vertical staggered arrangement of the connecting sections 214 can continuously change the flow direction of the cooling medium in each flow channel section 213, thereby making the cooling medium flow through each flow channel region 21 of the stator core in a tortuous flow manner, and achieving a significantly improved continuous cooling effect.

[0037] The stator core in this embodiment is as follows: Figure 1As shown, it includes an inlet channel 1 and two channel region groups 2. The inlet channel 1 is located at the axial midpoint of the outer circumferential surface of the stator core, and the two channel region groups 2 are symmetrically arranged on both sides of the inlet channel 1. Thus, multiple channel regions 21 are equally spaced on both sides of the inlet channel 1. The cooling medium enters the corresponding channel region 21 through multiple inlets 211 arranged on both sides of the inlet channel 1, so that the cooling medium flows in the multiple channel regions 21 and covers the entire outer circumferential surface of the stator core, thereby uniformly cooling the stator core.

[0038] Reference Figure 2 and Figure 3 The stator core is composed of two symmetrically arranged halves 3. Each half 3 can be integrally formed or formed by stacking multiple laminations, and each half 3 defines half of the inlet channel 1 and a channel region group 2. Thus, when the two halves 3 are symmetrically arranged, the half of the inlet channel 1 defined by each half 3 combines with each other to form a complete inlet channel 1, and the channel region groups 2 defined by each half 3 are symmetrically arranged on both sides of the complete inlet channel 1.

[0039] Advantageously, each half can include multiple lamination groups consisting of four or even fewer (e.g., three) lamination types. Because only a smaller number of lamination types are involved, assembling the stator core is simpler and material costs are lower.

[0040] See especially Figure 3 It shows that each half 3 may include a first stack 4, two second stacks 5, two third stacks 6, and a fourth stack 7 arranged coaxially. These stacks involve four different types of stacks in this embodiment (the various types of stack structures will be described in detail below).

[0041] Specifically, Figure 3When each lamination group is considered as a whole, the first lamination group 4 forms multiple flow channel segments 213 extending axially along the stator core of the flow channel region group 2 on its outer periphery, which covers the flow channel segments 213 in all flow channel regions 21 corresponding to the flow channel region group 2. Two second lamination groups 5 are respectively disposed on both sides of the first lamination group 4 axially and are disposed at an angle offset relative to each other in the circumferential direction of the stator core. Thus, a circumferentially extending connecting segment 214 is formed on the side of each flow channel segment 213 near the entry flow channel 1 to connect to another flow channel segment 213 adjacent to that flow channel segment on that side, and a circumferentially extending connecting segment 214 is formed on the other side of each flow channel segment 213 away from the entry flow channel 1 to connect to another flow channel segment 213 adjacent to that flow channel segment on that other side. Furthermore, the second lamination group 5 on one side defines an inlet section 216 connecting the flow channel section 213 and the inlet 211, while the second lamination group 5 on the other side defines an outlet section 215 connecting the flow channel section 213 and the outlet 212. Two third lamination groups 6 are respectively disposed on the axial side of the corresponding second lamination group 5 facing away from the first lamination group 4, such that one of the third lamination groups 6 ( Figure 3 The third stack 6 on the right side forms the inlet 211 of each flow channel region 21 in the corresponding flow channel region group 2, and another third stack 6 ( Figure 3 The third lamination group 6 on the left side forms the outlet 212 of each flow channel region 21 in the corresponding flow channel region group 2. The fourth lamination group 7 is disposed on an axial side opposite to the corresponding second lamination group 5 of the third lamination group 6 that forms the inlet 211, thereby forming half of the entry into the flow channel 1 through the fourth lamination group 7.

[0042] It should be understood that, when the two second lamination groups 5 are staggered, in order to ensure that the stator core ultimately formed by all lamination groups still has aligned stator yokes and stator teeth after the staggered stacking, the misalignment angle between the two second lamination groups 5 must at least satisfy a positive integer multiple relationship between the misalignment angle and the tooth spacing angle. Of course, in actual design, considering the flow channel design between different lamination groups (including the number of flow channel regions, the span angle of the flow channel regions, etc.), a suitable misalignment angle can be finally selected.

[0043] According to an exemplary embodiment of the first stack 4, the first stack 4 may include, for example, Figure 4The diagram shows a plurality of first-type laminations 41. Each first-type lamination 41 may include a first outer peripheral segment 411 and a plurality of first toothed segments 412. The first outer peripheral segment 411 is annular, and the plurality of first toothed segments 412 extend radially inward along the inner periphery of the first outer peripheral segment 411. A plurality of first toothed grooves 413 are provided on the outer periphery of the first outer peripheral segment 411. The plurality of first toothed grooves 413 are arranged at equal intervals along the circumference of the first outer peripheral segment 411, and each first toothed groove 413 is provided through the first-type lamination 41 along the axial direction. Thus, when the plurality of first-type laminations 41 are stacked to form a first lamination group 4, the corresponding first toothed grooves 413 are stacked to form a flow channel segment 213 extending axially along the stator core in the corresponding flow channel region group 2.

[0044] According to an exemplary embodiment of the second stack 5, the second stack 5 may include, for example, Figure 5 The diagram shows a plurality of second-type laminations 51. Each second-type lamination 51 may include a second outer peripheral segment 511 and a plurality of second toothed segments 512. The second outer peripheral segment 511 is annular, and the plurality of second toothed segments 512 extend radially inward along the inner periphery of the second outer peripheral segment 511. A plurality of sets of second toothed grooves 513 are provided on the outer periphery of the second outer peripheral segment 511. Each set of second toothed grooves 513 is equally spaced along the circumference of the second outer peripheral segment 511 and may include a flow-through toothed groove 5131 and a plurality of flow-channel toothed grooves 5132 arranged at intervals. Figure 5 An exemplary illustration shows one flow passage 5131 and five flow passage 5132 corresponding to each flow channel region 21. Thus, when multiple second-type laminations 51 are stacked to form a second lamination group 5, and the second lamination group 5 is positioned on both axial sides of the first lamination group 4, the corresponding flow passage 5131 are stacked to form an outlet section 215 or an inlet section 216 in the flow channel region 21. For example, in combination with... Figure 3 As shown, when one of the second lamination groups 5 is disposed on the side of the first lamination group 4 near the fourth lamination group 7, the corresponding flow passage grooves 5131 are stacked to form an inlet section 216 connecting the corresponding flow channel section 213 and the inlet 211. When another second lamination group 5 is disposed on the side of the first lamination group 4 away from the fourth lamination group 7, the corresponding flow passage grooves 5131 are stacked to form an outlet section 215 connecting the corresponding flow channel section 213 and the outlet 212. Multiple flow passage grooves 5132 are stacked to form a connecting section 214 in the flow channel region 21 for connecting every two adjacent flow channel sections 213.

[0045] Optionally, the flow passage 5131 of the second type of lamination 51 corresponds to a first tooth 413 of the first type of lamination 41, and the flow channel 5132 corresponds to two adjacent spaced-apart first tooth 413 and the intermediate interval between the two first tooth 413. Therefore, the width of the flow passage 5131 is smaller than the width of the flow channel 5132. In this embodiment, the width of the intermediate interval between the two first tooth 413 is approximately the same as the width of the first tooth 413, so the width of the flow passage 5131 is approximately one-third the width of the flow channel 5132. Of course, according to actual design requirements, other different lamination tooth parameter designs can be conceived to obtain different stator lamination arrangement structures.

[0046] According to an exemplary embodiment of the third lamination group 6, the third lamination group 6 may include, for example, Figure 6 The diagram shows a plurality of third-type laminates 61. Each third-type laminate 61 may include a third outer peripheral segment 611 and a plurality of third tooth segments 612. The third outer peripheral segment 611 is annular, and the plurality of third tooth segments 612 extend radially inward along the inner periphery of the third outer peripheral segment 611. A plurality of third tooth grooves 613 are provided on the outer periphery of the third outer peripheral segment 611, and the plurality of third tooth grooves 613 are arranged at equal intervals along the circumference of the third outer peripheral segment 611, and each third tooth groove 613 is provided through the third-type laminate 61 along the axial direction. Figure 6 Twelve third toothed grooves 613, each corresponding to one of the twelve flow channel regions 21, are shown as an example. Figure 3 In the third lamination group 6 near the fourth lamination group 7, the third grooves 613 of the multiple stacked third type laminations 61 constitute multiple inlets 211 in the corresponding flow channel region 21. In the third lamination group 6 away from the fourth lamination group 7, the third grooves 613 of the multiple stacked third type laminations 61 constitute multiple outlets 212 in the corresponding flow channel region 21.

[0047] According to an exemplary embodiment of the fourth lamination group 7, the fourth lamination group 7 may include, for example, Figure 7 The diagram shows a plurality of fourth-type laminations 71. Each fourth-type lamination 71 may include a fourth peripheral segment 711 and a plurality of fourth tooth segments 712. The fourth peripheral segment 711 is annular, and the plurality of fourth tooth segments 712 extend radially inward along the inner periphery of the fourth peripheral segment 711. The outer diameter of the fourth peripheral segment 711 is smaller than the outer diameter of the third peripheral segment 611 of the third-type lamination 61, thereby forming a recessed inlet channel 1 when the fourth lamination group 7 and the third lamination group 6 are assembled and the two halves are arranged symmetrically, wherein the sidewall of the inlet channel 1 is defined by the third peripheral segment 611, and the bottom wall of the inlet channel 1 is defined by the fourth peripheral segment 711.

[0048] In the specific embodiments described above, each half is illustrated as consisting of multiple stacked groups of four different types of stacked sheets 41, 51, 61, and 71. However, it should be understood that each half may include multiple stacked groups consisting of a smaller number, for example, three different types of stacked sheets. For example, in other embodiments, while keeping the stacked sheet types constituting the second to fourth stacked groups unchanged, it is conceivable to consider... Figure 3 The first lamination group 4 shown is replaced by laminations of the second type 51 (instead of the first type 41 in this embodiment), wherein the first lamination group 4 composed of the second type 51 can be aligned with the second lamination group 5 located on one axial side thereon, thereby forming a different configuration of a tortuous cooling channel, the width of which is wider than that in this embodiment. In other words, various possible tortuous (or zigzag) cooling channel designs are feasible, as long as continuous cooling recirculation with a constantly changing flow direction of the cooling medium on the outer circumferential surface of the stator core, which is intended to be achieved herein, can be realized.

[0049] The present invention also provides a stator assembly, which may include the aforementioned stator core and stator windings wound on the stator core. Since the flow channel region group 2 is provided with a plurality of outlets 212 corresponding to each flow channel region 21, the cooling medium is allowed to be sprayed through the outlets 212 to the ends of the stator windings after the stator core has been sufficiently cooled, which is beneficial for effectively cooling the stator windings while simultaneously cooling the stator core. The present invention also provides a motor including the aforementioned stator core or the aforementioned stator assembly.

[0050] As described above, according to the present invention, the stator core has a flow channel region group 2 connected to the inlet flow channel 1 on one or both sides, consisting of multiple flow channel regions 21, such that the entire outer circumferential surface of the stator core is covered with flow channels (including the inlet flow channel and multiple flow channel regions) for the flow of cooling medium. Each flow channel region includes multiple flow channel segments 213 and multiple connecting segments 214 that are connected to each other. In particular, the multiple flow channel segments 213 are parallel to the axial direction of the stator core and arranged at intervals along the circumference of the stator core, while the connecting segments 214 are staggered so that the multiple flow channel segments 213 are connected end to end, allowing the flow direction of the cooling medium to be continuously changed, thereby forming an annular cooling channel. In this way, the cooling medium can continuously contact the stator core during the flow process to achieve effective cooling of the stator core. Meanwhile, with oil ring structures at both ends of the stator core, the cooling medium is allowed to flow out of the stator core through outlet 212 and fall onto the stator winding to cool the stator winding, thus slowing down the temperature rise of the stator winding, thereby effectively reducing the manufacturing cost of the stator core and enhancing the cooling effect.

[0051] It should be noted that the embodiments described above should be considered exemplary only, and the present invention is not limited to these embodiments. By considering the content of this specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the invention. The true scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A stator core characterized by, The stator core is provided on its outer circumferential surface with an inlet flow channel (1) for the inflow of a cooling medium and at least one flow channel region group (2) communicating with the inlet flow channel, the flow channel region group comprising a plurality of flow channel regions (21), wherein each flow channel region is provided with an inlet (211) communicating with the inlet flow channel and an outlet (212) for discharging the cooling medium from the inlet flow channel to the outside of the stator core; each flow channel region (21) further comprises a plurality of flow channel sections (213), each two adjacent flow channel sections communicating with each other through a connecting section (214), so that the cooling medium is allowed to continuously flow from the inlet flow channel through the inlet (211) of the flow channel region, through the plurality of flow channel sections (213) of the flow channel region and finally out of the stator core through the outlet (212) of the flow channel region.

2. The stator core according to claim 1, characterized by In each flow channel region (21), the respective connecting sections (214) for connecting each two adjacent flow channel sections (213) are arranged staggered with each other to allow continuous change of the flow direction of the cooling medium in the respective flow channel sections.

3. The stator core according to claim 1 or 2, characterized in that, The inlet flow channel (1) is located at a middle position of the outer circumferential surface of the stator core, the stator core comprising two flow channel region groups (2) symmetrically arranged on both sides of the inlet flow channel.

4. The stator core according to claim 3, characterized by The stator core is composed of two halves (3) symmetrically arranged with each other, each half being jointly laminated by a plurality of lamination groups and defining a half of the inlet flow channel (1) and one flow channel region group (2).

5. The stator core of claim 4, characterized by The plurality of lamination groups of each half is composed of four or less number of different types of laminations.

6. The stator core of claim 5, characterized by Each half (3) comprises a first lamination group (4) coaxially arranged, two second lamination groups (5), two third lamination groups (6) and a fourth lamination group (7); wherein the first lamination group (4) forms a plurality of flow channel sections (213) extending in the axial direction of the corresponding flow channel region group (2) on its outer circumference; the two second lamination groups (5) are respectively arranged on the axial sides of the first lamination group (4) with an angular displacement in the circumferential direction relative to each other, so that the two second lamination groups respectively form a connecting section (214) close to one side of the inlet flow channel (1) and a connecting section away from the inlet flow channel; the two third lamination groups (6) are respectively arranged on an axial side of the corresponding second lamination group (5) away from the first lamination group (4), so that the two third lamination groups respectively form an inlet (211) and an outlet (212) of each flow channel region (21) in the corresponding flow channel region group (2); and the fourth lamination group (7) is arranged on an axial side of the third lamination group (6) forming the inlet (211) away from the corresponding second lamination group (5) to form a half of the inlet flow channel (1) by the fourth lamination group.

7. The stator core of claim 6, characterized by The first lamination set (4) comprises a plurality of first type laminations (41) arranged in a stack, each first type lamination comprising a first outer peripheral section (411) in the form of a ring and a plurality of first tooth sections (412) extending radially inwardly at an inner periphery of the first outer peripheral section, the outer periphery of the first outer peripheral section (411) being provided with a plurality of first tooth slots (413) distributed at equal intervals, whereby the first tooth slots, when stacked, form axial flow channel sections (213) in the respective flow channel area set (2).

8. The stator core of claim 7, characterized by Each second lamination set (5) comprises a plurality of second type laminations (51) arranged in a stack, each second type lamination comprising a second outer peripheral section (511) in the form of a ring and a plurality of second tooth sections (512) extending radially inwardly at an inner periphery of the second outer peripheral section, the outer periphery of the second outer peripheral section (511) being provided with a plurality of second tooth slots (513), each set of second tooth slots comprising one through-flow tooth slot (5131) and a plurality of flow channel tooth slots (5132), whereby the flow channel tooth slots, when stacked, form connection sections (214) in the corresponding flow channel area (21) and the through-flow tooth slots form outlet sections (215) in flow communication with an outlet (212) or inlet sections (216) in flow communication with an inlet (211) in the corresponding flow channel area.

9. The stator core of claim 8, characterized by The through-flow tooth slots (5131) have a width that is smaller than the width of the flow channel tooth slots (5132).

10. The stator core according to claim 8 or 9, characterized in that, Each third lamination set (6) comprises a plurality of third type laminations (61) arranged in a stack, each third type lamination comprising a third outer peripheral section (611) in the form of a ring and a plurality of third tooth sections (612) extending radially inwardly at an inner periphery of the third outer peripheral section, the outer periphery of the third outer peripheral section (611) being provided with a plurality of third tooth slots (613), whereby the third tooth slots, when stacked, form an outlet (212) or an inlet (211) in the corresponding flow channel area (21) when the plurality of third type laminations (61) are stacked.

11. The stator core of claim 10, characterized by The fourth lamination set (7) comprises a plurality of fourth type laminations (71) arranged in a stack, each fourth type lamination comprising a fourth outer peripheral section (711) in the form of a ring and a plurality of fourth tooth sections (712) extending radially inwardly at an inner periphery of the fourth outer peripheral section, the outer diameter of the fourth outer peripheral section (711) being smaller than the outer diameter of the third outer peripheral section (611) of the third type laminations, whereby the plurality of fourth type laminations (71), when stacked and assembled together with the other lamination sets to form a half, define a recessed area to form a half of the inlet flow channel (1).

12. A stator assembly characterized by, The stator assembly comprises a stator core according to any one of claims 1 to 11.

13. An electric machine characterized by The electric machine comprises a stator core according to any one of claims 1 to 11 or a stator assembly according to claim 12.

Images