Stator core, stator assembly and motor

Abstract

The utility model relates to a stator core, a stator assembly and a motor. The stator core comprises two first lamination groups and a second lamination group arranged between the two first lamination groups; each first lamination group is provided with a plurality of outflow channels; the second lamination group is provided with a plurality of groups of flow inlet structures, each group of flow inlet structure comprises a radial flow inlet and at least three flow inlet channels, and each flow inlet channel terminates at the yoke part of the second lamination group; each inflow channel includes a first outlet in fluid communication with a corresponding outflow channel in one of the first stack and a second outlet in fluid communication with a corresponding outflow channel in the other first stack. By adopting the stator iron core provided by the utility model, not only is the production cost reduced by omitting an oil ring structure, but also the cooling efficiency of the stator component is improved through the effective design of the inflow channel and the outflow channel.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a stator core, a stator assembly comprising the stator core, and a motor comprising the stator core or the stator assembly. Background Art

[0002] In the field of new energy vehicles, 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 corresponding functions. The basic principle is to use the principle of electromagnetic induction to convert electrical energy into mechanical energy.

[0003] The motor mainly includes a stator and a rotor, wherein the stator may include a stator core and a stator winding, and the rotor may include a rotor shaft, a rotor core and a rotor winding (or a permanent magnet). When current passes through the stator winding, a rotating magnetic field is generated in the stator core, which induces a rotor magnetic field in the rotor winding and causes the rotor assembly to rotate, thereby converting electrical energy into mechanical energy. The motor generates a lot of heat during operation, so it is particularly important to effectively cool the various components of the motor (including the stator core, stator winding, etc.).

[0004] It is known in the prior art that oil cooling can be used to cool the motor. For example, there is a known solution that uses axial direct current or offset turbulence in the core and / or adds oil ring structures at both ends of the stator core to cool the stator core and stator winding. However, this cooling solution has high material costs, complex processes, and poor cooling effects. Therefore, it is necessary to propose an improved cooling structure for the motor. Utility Model Content

[0005] The present utility model is proposed based on such background, and its purpose is to provide an improved stator core, stator assembly and motor structure, so as to overcome one or more of the above problems in the prior art.

[0006] According to one aspect of the utility model, a stator core is proposed, which comprises two coaxially arranged first lamination groups and a second lamination group arranged between the two first lamination groups; wherein each of the first lamination groups is provided with a plurality of outlet channels extending axially therethrough around its circumferential intervals; the second lamination group is provided with a plurality of groups of inlet structures around its circumferential intervals, each group of inlet structures comprising a radial inlet port and at least three inlet channels branching from the radial inlet port, wherein each inlet channel terminates at a yoke of the second lamination group; each inlet channel in each group of inlet structures comprises a first outlet fluidly connected to a corresponding outflow channel in one of the two first lamination groups and a second outlet fluidly connected to a corresponding outflow channel in the other of the two first lamination groups.

[0007] Advantageously, a flow rate reduction structure is provided at the junction of each inlet channel of the second lamination group and the corresponding outlet channel in the first lamination group, and the flow rate reduction structure is designed to change the cross-sectional area at the junction, wherein in the flow direction of the cooling medium, the cross-sectional area of ​​the outlet channel downstream of the junction is larger than the cross-sectional area of ​​the inlet channel upstream of the junction.

[0008] Advantageously, the first lamination group comprises a plurality of first laminations arranged in a stacked manner, each first lamination comprising a first annular outer peripheral segment and a plurality of first tooth segments extending radially inwardly along the inner periphery of the first outer peripheral segment; each first lamination is provided with a plurality of outlet holes extending axially therethrough at intervals around its circumference, so that when the plurality of first laminations are stacked, a corresponding outflow channel is formed by the outlet holes stacked along the same axis.

[0009] Advantageously, the second lamination group comprises a plurality of second laminations arranged in a stacked manner, each second lamination comprising a second annular outer peripheral segment and a plurality of second tooth segments extending radially inwardly along the inner periphery of the second outer peripheral segment; each second lamination is provided with a plurality of groups of inlet flow grooves spaced around its circumference, so that when the plurality of second laminations are stacked, a corresponding group of inlet flow structures is formed by the inlet flow grooves stacked along the same axis.

[0010] Advantageously, each group of inlet grooves in each second lamination includes a radially recessed inlet end and at least three inlet groove paths branching out from the inlet end portion; each inlet groove path terminates at an outlet end, so that when the plurality of second laminations are stacked, the outlet ends stacked along the same axis form a first outlet and a second outlet of the corresponding inlet channel.

[0011] Advantageously, the outlet end of each inlet channel is arranged to extend along the center line of the corresponding second tooth segment.

[0012] Advantageously, each outflow channel terminates at a tooth section of the first lamination stack, and each outlet opening in each first lamination is arranged to extend along a center line of a corresponding first tooth section.

[0013] Advantageously, the outer diameter of the outer circumference of the two first lamination groups is greater than that of the outer circumference of the second lamination group, so that an annular inlet flow channel is defined on the outer circumference of the stator core, and the inlet flow channel is fluidically connected to the radial inlet port on the second lamination group.

[0014] According to the second aspect of the utility model, a stator assembly is proposed, which includes: the stator core as described above, the stator core including a stator yoke and a plurality of stator teeth defined by two first lamination groups and a second lamination group; and a stator winding, the stator winding being wound on the plurality of stator teeth; wherein, after the cooling medium flows in from the radial inlet of the second lamination group, it flows through the outlet channel in the first lamination group located on both sides of the second lamination group to cool the stator core, and the cooling medium flowing out through the outlet channel can flow out to the end of the stator winding to cool it.

[0015] According to a third aspect of the utility model, a motor is proposed, wherein the motor comprises the stator core as described above or the stator assembly as described above.

[0016] Compared with the prior art, the stator core, stator assembly and motor according to the utility model can achieve at least one of the following technical effects: the cooling medium flows into the corresponding outlet channel through the multiple inlet channels in the multiple groups of oil inlet structures, so that the cooling medium can continuously contact the stator core when flowing in the inlet channel and the outlet channel, thereby enhancing heat conduction and improving cooling efficiency; by setting a flow rate reduction structure, the flow time of the cooling medium in the stator core can be extended. In addition, since the flow rate reduction structure is set at the junction of the inlet channel and the outlet channel, there is no need to remove more material from the second lamination group to achieve flow rate reduction, thereby ensuring that the electromagnetic performance of the stator core is not damaged; the cooling medium can be sprayed toward the end of the stator winding in a jet shape at the outlet of the outlet channel, thereby achieving continuous cooling of the stator core and the stator winding without the need for any oil ring structure; the entire stator core can be composed of only two laminations of different specifications, which greatly simplifies material management and saves material costs and process costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features and advantages of the present invention will become more easily understood through the following description with reference to the accompanying drawings, in which:

[0018] Figure 1 A partial perspective view of a stator core and a stator winding of a motor in the prior art is shown;

[0019] Figure 2 A three-dimensional diagram of a stator core according to an embodiment of the utility model is shown;

[0020] Figure 3 Shows Figure 2 Exploded view of the stator core;

[0021] Figure 4 Shows Figure 2 A cross-sectional view of a stator core along its axial direction and passing through one set of inlet flow structures;

[0022] Figure 5 A schematic diagram of a first lamination constituting a first lamination group is shown;

[0023] Figure 6 A schematic diagram showing a second lamination constituting a second lamination group; and

[0024] Figure 7 Shows Figure 6 A partial enlarged view of the second lamination is shown.

[0025] All the drawings are only schematic and not necessarily drawn to scale, and they only show those parts necessary for illustrating the present invention, and other parts are omitted or merely mentioned. That is, in addition to the parts shown in the drawings, the present invention may also include other parts. DETAILED DESCRIPTION

[0026] In the following description, many specific details are set forth so that those skilled in the art can more fully understand the present invention. However, it is obvious to those skilled in the art that the present invention may be implemented without some of these specific details. The following various aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless explicitly stated in the claims. Terms such as "first" and "second" are used below to describe the elements of the present application, and these terms are only used to distinguish between the various elements without intending to limit the nature, sequence, order or number of these elements. In addition, it should be noted that in this specification, the same and / or functionally identical technical features are marked with the same or similar figures.

[0027] As mentioned in the background art, in order to achieve cooling of the stator core and stator winding in the motor, there are various solutions in the prior art. For example, Figure 1 A stator core structure known in the prior art is shown, which adopts an end oil spray cooling method. Figure 1 The stator core 1' is provided with a plurality of oil channels 11' extending axially therethrough at intervals along its circumference, and an oil ring structure 3' is provided at each of the two axial ends of the stator core 1', and radial holes 31' extending radially therethrough are formed on the oil ring structure 3'. After the cooling oil flows out through the oil channel 11', it flows along the outer peripheral wall of the oil ring structure 3' to the radial hole 31', and is sprayed on the end of the stator winding 2' through the radial hole 31' and the inner peripheral wall of the oil ring structure 3', thereby cooling the stator winding 2'. However, this solution usually requires the provision of a separate oil ring structure, resulting in high processing costs, complex processes, and poor cooling performance.

[0028] To this end, the utility model proposes an improved solution, which makes it possible to omit unnecessary oil ring structures, achieve cooling of the stator core and the stator winding simply and efficiently, and also greatly simplify the processing and assembly of the stator core.

[0029] According to the stator core of the embodiment of the utility model, see Figure 2 and Figure 3 , which respectively shows a stator core according to an embodiment of the utility model in a stereoscopic view and an exploded view, and the stator core may include two first lamination groups 1 and a second lamination group 2. The two first lamination groups 1 are respectively Figure 2 and Figure 3 The left and right sides are shown, and the second laminated core 2 is clamped between the two first laminated cores 1 .

[0030] See especially Figure 3 Each first lamination stack 1 is provided with a plurality of outflow channels 11 at intervals around its circumference, and each outflow channel 11 penetrates the first lamination stack 1 in the axial direction, and forms an inlet of the outflow channel 11 on the lateral surface of the first lamination stack 1 close to the second lamination stack 2, and forms an outlet of the outflow channel 11 on the lateral surface of the first lamination stack 1 far from the second lamination stack 2; the second lamination stack 2 is provided with a plurality of groups of inflow structures at intervals around its circumference, and each group of inflow structures includes a radial inlet 22 radially recessed from the outer circumferential surface of the second lamination stack 2 and at least two or three inlet channels 21 (for example, Figure 3 Each inlet channel 21 includes two outlets 23 formed on two lateral surfaces of the second lamination stack 2, wherein Figure 2 In the assembled state shown, the first outlet of each inlet channel 21 is in fluid communication with the corresponding outlet channel 11 in one of the first lamination stacks, and the second outlet is in fluid communication with the corresponding outlet channel 11 in the other first lamination stack, so that the cooling medium (such as cooling oil) is allowed to enter through the radial inlet 22 and then flow into the outlet channels 11 in the two first lamination stacks 1 located on both sides of the second lamination stack 2 through the two opposite outlets 23 in opposite directions A and B and then flow out from them (see Figure 4 ). It can be understood that the lateral surface refers to the two outer end surfaces of the first lamination stack 1 (or the second lamination stack 2) along its axial direction. The peripheral surface refers to the outer surface of the first lamination stack 1 (or the second lamination stack 2) extending along its circumferential direction.

[0031] Specifically, when the first lamination group 1 and the second lamination group 2 are regarded as a whole, the first lamination group 1 may include a first yoke 13 and a plurality of first teeth 14. The plurality of first teeth 14 are arranged at equal intervals on the inner circumference of the first yoke 13 and extend radially inward from the inner circumference of the first yoke 13. A first slot is formed between two adjacent first teeth 14. Similarly, the second lamination group 2 may include a second yoke 25 and a plurality of second teeth 26. The plurality of second teeth 26 are arranged at equal intervals on the inner circumference of the second yoke 25 and extend radially inward from the inner circumference of the second yoke 25. A second slot is formed between two adjacent second teeth 26. After the first lamination group 1 and the second lamination group 2 are coaxially assembled together, the first teeth 14 and the second teeth 26 are aligned with each other, and the first yoke 13 and the second yoke 25 are aligned with each other, so that the stator yoke and stator teeth of the stator core are formed by these lamination groups together. The stator winding (not shown) is wound on the stator teeth. The cooling medium flows in from the radial inlet 22 of the second lamination group 2 and flows through the outlet channels 11 in the first lamination group 1 located on both sides of the second lamination group 2 to cool the stator core. At the same time, the cooling medium flowing out through the outlet channels 11 can flow out in a jet shape to the end of the stator winding to cool the stator winding.

[0032] According to a favorable arrangement, each inlet channel in the second lamination stack 3 terminates at the second yoke 25 of the second lamination stack and does not extend to the second tooth 26, which advantageously avoids removing more material from the second yoke of the second lamination stack and causing damage to the electromagnetic performance of the stator core.

[0033] In addition, a flow rate reduction structure is provided at the junction of each inlet channel of the second lamination group and the corresponding outlet channel in the first lamination group. The flow rate reduction structure is designed to change the cross-sectional area at the junction, wherein in the flow direction of the cooling medium, the cross-sectional area of ​​the outlet channel downstream of the junction is larger than the cross-sectional area of ​​the inlet channel upstream of the junction. By setting up such a flow rate reduction structure, since it is not necessary to remove more material from the second lamination group (such as the change in the cross section of the inlet channel itself) to achieve flow rate reduction, it is also advantageously avoided that the electromagnetic performance is damaged due to the removal of more material.

[0034] In addition, if Figure 2 It can be seen that the outer diameter of the outer circumference of the first lamination group 1 is greater than the outer diameter of the outer circumference of the second lamination group 2, so that when the first lamination group 1 and the second lamination group 2 are joined, an annular inlet channel 3 is defined on the outer periphery of the stator core, and the inlet channel 3 is fluidically connected to the multiple radial inlet ports 22 on the second lamination group 2.

[0035] According to a further exemplary embodiment of the first laminate stack 1, the first laminate stack 1 may include: Figure 5The multiple first laminations 12 shown. Each first lamination 12 may include a first peripheral section 121 and a plurality of first tooth sections 122. The first peripheral section 121 is annular, and the plurality of first tooth sections 122 extend radially inwardly along the inner circumference of the first peripheral section 121. Each first lamination 12 is provided with a plurality of outlet holes 123 axially extending therethrough at equal intervals along its circumference, and the outlet holes 123 may extend along the center line of the corresponding (or adjacent to the outlet holes) first tooth section (122), and each outlet channel 11 or each outlet hole 123 terminates at the tooth portion 14 of the first lamination group, so as to ensure better cooling performance. When the first lamination group 1 is formed by stacking the plurality of first laminations 12, the outlet holes 123 at the corresponding positions on the plurality of first laminations 12 can be stacked along the same axis to form a complete outlet channel 11.

[0036] According to a further exemplary embodiment of the second lamination stack 2, the second lamination stack 2 may include a plurality of laminations such as Figure 6 The second lamination 24 shown. Each second lamination 24 may include a second peripheral section 241 and a plurality of second tooth sections 242. The second peripheral section 241 is annular, and a plurality of second tooth sections 242 extend radially inward along the inner circumference of the second peripheral section 241. The structure of the second lamination 24 is substantially the same as that of the first lamination 12, so that when the two first lamination groups 1 and the second lamination group 2 are joined, each first tooth section 122 can overlap with the second tooth section 242 at the corresponding position. The difference between the second lamination 24 and the first lamination 12 is that each second lamination 24 is provided with a plurality of groups of inlet grooves 243 at intervals along its circumference. When a plurality of second laminations 24 are stacked to form the second lamination group 2, the inlet grooves 243 at the corresponding positions can be stacked along the same axis to form a group of corresponding inlet structures. In the above embodiment, the first lamination 12 and the second lamination 24 can be made of silicon steel sheets, or can be a sheet structure made of other high magnetic permeability materials.

[0037] Continue to see Figure 7 As a specific embodiment, each group of inlet grooves 243 is arranged in the second peripheral section 241, and may include a radially recessed inlet end 2431 and at least two or three (for example, three shown in the figure) inlet grooves 2432 extending from the inlet end. Each inlet groove ends at an end or an outlet end, so that when a plurality of second laminations 24 are stacked, the inlet grooves stacked along the same axis form a corresponding inlet channel, and the outlet ends stacked along the same axis form the first outlet and the second outlet of the corresponding inlet channel, which lead to the corresponding outlet channels 11 in the two first lamination groups, respectively.

[0038] In this embodiment, the outlet end of each inlet channel 2432 is arranged to extend along the center line of the corresponding second tooth segment 242 (or adjacent to the outlet end).

[0039] Preferably, each group of inlet grooves 243 of this embodiment is provided with three inlet grooves 2432, and each inlet groove 2432 is in fluid communication with the inlet end 2431, so that Figure 7 A "claw"-shaped cross section is formed on the second lamination 24 shown. Every three outlet holes 123 on the first lamination 12 correspond to a group of inlet slots 243 on the second lamination 24, that is, a group of inlet structures corresponds to the corresponding three outlet channels 11 in the first lamination group 1 on the left and right sides. It can be understood that the cooling medium entering each inlet channel can flow into the three outlet channels 11 on the left and the three outlet channels 11 on the right in different directions. By changing the flow direction of the cooling medium, the cooling medium can continuously contact the first lamination group 1 and the second lamination group 2 when flowing in the micro inlet channel 21 and the outlet channel 11, thereby increasing heat conduction and forming a continuous cooling effect on the stator core.

[0040] The utility model also provides a stator assembly, which may include the above-mentioned stator core and stator winding. Due to the above-mentioned arrangement of the inlet channel 21 and the outlet channel 11, the cooling medium is allowed to flow out of the outlet channel 11 in a jet-like manner and sprayed onto the end of the stator winding, which is conducive to cooling the stator core while allowing the stator winding to be effectively cooled. The utility model also provides a motor including the above-mentioned stator core or the above-mentioned stator assembly.

[0041] As described above, according to the stator core of the utility model, the first lamination group 1 and the second lamination group 2 can be constructed by only two laminations of different specifications. The entire stator core has a simple structure, is easy to assemble and has a reduced production cost. In addition, multiple groups of inlet structures are formed on the second lamination group 2, and multiple outlet channels 11 are formed on the first lamination group 1, so that the cooling medium can enter the multiple inlet channels 21 in the multiple groups of inlet structures from the annular inlet channel 3 through multiple radial inlets 22, and then enter the outlet channels 11 in the first lamination group 1 on both sides respectively. By changing the flow direction of the cooling medium, the cooling medium can continuously contact the stator core during the flow process to achieve effective cooling of the stator core, and at the same time, it also allows the cooling of the stator winding without the need for an oil ring structure.

[0042] It should be noted that the embodiments described above are only to be considered as exemplary, and the present invention is not limited to these embodiments. By considering the contents of this specification, those skilled in the art may make various changes and modifications without departing from the scope or spirit of the present invention. The true scope of the present invention is defined by the appended claims and equivalents.

Claims

1. A stator core, characterized in that: The stator core comprises two first lamination groups (1) arranged coaxially and a second lamination group (2) arranged between the two first lamination groups (1); wherein each of the first lamination groups (1) is provided with a plurality of outflow channels (11) penetrating along the axial direction at circumferential intervals thereof; the second lamination group (2) is provided with a plurality of inflow structures at circumferential intervals thereof, each of which comprises a radial inlet port (22) and at least three inflow channels (21) branching from the radial inlet port (22), wherein each inflow channel terminates at a yoke (25) of the second lamination group; each inflow channel (21) in each inflow structure comprises a first outlet fluidly connected to a corresponding outflow channel in one of the two first lamination groups and a second outlet fluidly connected to a corresponding outflow channel in the other of the two first lamination groups.

2. The stator core according to claim 1, characterized in that: A flow rate reduction structure is provided at the junction of each inlet channel of the second lamination group and the corresponding outlet channel in the first lamination group, and the flow rate reduction structure is designed to change the cross-sectional area at the junction, wherein in the flow direction of the cooling medium, the cross-sectional area of ​​the outlet channel downstream of the junction is larger than the cross-sectional area of ​​the inlet channel upstream of the junction.

3. The stator core according to claim 2, characterized in that: The first lamination group (1) comprises a plurality of first laminations (12) arranged in a stacked manner, each first lamination (12) comprising a first annular outer peripheral section (121) and a plurality of first tooth sections (122) extending radially inwardly on the inner periphery of the first outer peripheral section (121); each first lamination (12) is provided with a plurality of outlet holes (123) extending axially therethrough at intervals around its circumference, so that when the plurality of first laminations (12) are stacked, a corresponding outflow channel (11) is formed by the outlet holes stacked along the same axis.

4. The stator core according to claim 3, characterized in that: The second lamination group (2) comprises a plurality of second laminations (24) arranged in a stacked manner, each second lamination (24) comprising a second annular outer peripheral segment (241) and a plurality of second tooth segments (242) extending radially inwardly on the inner periphery of the second outer peripheral segment (241); each second lamination (24) is provided with a plurality of groups of inlet grooves (243) arranged at intervals around the circumference thereof, so that when the plurality of second laminations (24) are stacked, a corresponding group of inlet structures is formed by the inlet grooves stacked along the same axis.

5. The stator core according to claim 4, characterized in that: Each group of inlet grooves (243) in each second stack (24) includes an inlet end (2431) recessed in the radial direction and at least three inlet grooves (2432) branching out from the inlet end; each inlet groove terminates at an outlet end, so that when the plurality of second stacks (24) are stacked, the outlet ends stacked along the same axis form a first outlet and a second outlet of a corresponding inlet channel.

6. The stator core according to claim 5, characterized in that: The outlet end of each inlet channel is arranged to extend along the center line of the corresponding second tooth segment (242).

7. The stator core according to any one of claims 1 to 6, characterized in that: Each outflow channel (11) terminates at a tooth section (14) of the first lamination stack, and each outlet hole (123) in each first lamination (12) is arranged to extend along a center line of a corresponding first tooth section (122).

8. The stator core according to any one of claims 1 to 6, characterized in that: The outer diameter of the outer circumference of the two first lamination groups (1) is greater than the outer diameter of the outer circumference of the second lamination group (2), so that an annular inlet flow channel (3) is defined on the outer circumference of the stator core, and the inlet flow channel is fluidically connected to the radial inlet port (22) on the second lamination group (2).

9. A stator assembly, characterized in that: The stator assembly comprises: The stator core according to any one of claims 1 to 8, comprising a stator yoke and a plurality of stator teeth defined by the two first lamination groups (1) and the second lamination group (2); and A stator winding, wherein the stator winding is wound on the plurality of stator teeth; The cooling medium flows in from the radial inlet (22) of the second lamination group (2) and then flows through the outlet channels (11) in the first lamination group (1) located on both sides of the second lamination group (2) to cool the stator core. The cooling medium flowing out through the outlet channels (11) can flow out to the ends of the stator winding to cool it.

10. A motor, characterized in that: The electric machine comprises the stator core according to any one of claims 1 to 8 or the stator assembly according to claim 9 .

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