Stator for motor, motor and household appliance

Abstract

A stator for a motor, a motor and a household electrical appliance, the stator comprising: an iron core comprising at least one punching sheet unit arranged along the axial direction of the stator; the at least one cavity channel is formed inside the punching sheet unit, the outer surface of the punching sheet unit is respectively provided with an inlet and an outlet which are communicated with the cavity channels, and a height difference exists between the outlet and the inlet along the axial direction of the stator. According to the scheme, the heat dissipation performance of the stator can be improved, the motor temperature can be reduced, and the efficiency and power density of the motor can be improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of motors, and in particular to a stator for a motor, a motor and a household appliance. Background Art

[0002] The stator is one of the key components of the motor. It is the main component of the magnetic circuit and is used to install the stator winding. When the motor is running, the stator core is subjected to the combined effects of mechanical force, thermal stress and electromagnetic force. Therefore, the temperature rise of the stator core plays a vital role in the safe and stable operation of the motor. A stator with poor heat dissipation performance will cause the overall temperature of the motor to be too high, which will have an adverse effect on the performance of the motor in terms of working efficiency and power density.

[0003] At present, the heat dissipation of the motor stator is mainly achieved through the surface of the stator that is not covered by the shell. Since the surface of the exposed part is usually flat and has a small surface area, the heat dissipation effect of the stator is poor. Even if heat dissipation ribs are added to the motor end cover, the effect of accelerating the heat dissipation inside the stator is limited. Summary of the invention

[0004] An object of an embodiment of the present invention is to provide an improved stator for a motor, a motor and a household appliance.

[0005] Therefore, an embodiment of the present invention provides a stator for a motor, comprising: an iron core, comprising at least one punching sheet unit arranged along the axial direction of the stator; at least one cavity formed inside the punching sheet unit, and the outer surface of the punching sheet unit is respectively provided with an inlet and an outlet connecting each of the cavities, wherein, along the axial direction of the stator, the outlet and the inlet have a height difference.

[0006] Compared with the existing motor stator, which only forms a heat dissipation surface on the outer surface, the heat inside the stator needs to be radiated to the surface before it can be finally dissipated, and the heat dissipation efficiency is low. The disclosed solution can improve the heat dissipation performance of the stator, which is beneficial to reducing the motor temperature and improving the efficiency and power density of the motor. Specifically, a three-dimensional cavity is formed in the spatial structure inside the stator core to increase the heat dissipation surface area of ​​the punching sheet. Furthermore, there is a height difference between the inlet and outlet of the cavity in the axial direction of the stator to form air convection, and the airflow takes away the heat emitted from the inside of the core while flowing along the cavity. As a result, the heat can be directly dissipated from the heat source to the air, further improving the heat dissipation efficiency. A stator with better heat dissipation performance can reduce the overall temperature of the motor, improve the motor efficiency and power density, for example, the maximum output capacity.

[0007] Furthermore, the self-extraction force of the rising hot air is utilized to realize natural convection in the cavity. There is no need to set up an additional driving mechanism for exhaust, and the natural flow of air can be realized in the cavity, thereby improving the heat dissipation efficiency. When the motor is working and the stator is heated, the heat on the stator winding is transferred to the iron core nearby. After the air in the cavity is heated, it flows from bottom to top along the cavity while taking away the heat, and cold air is automatically replenished from below. The internal surface area of ​​multiple cavities is greatly increased compared to the heat dissipation surface area of ​​the traditional stator core, thereby greatly improving the heat dissipation efficiency. Therefore, the stator described in this embodiment can greatly reduce the temperature of the motor, thereby reducing the energy loss of the motor, improving efficiency while increasing the power density of the motor, so that the motor has a higher output at the same size.

[0008] Optionally, the inlet and outlet connected to the same cavity are respectively opened on the outer surfaces of different sides of the punching unit. Thus, the winding length of the cavity inside the core can be increased, thereby increasing the heat dissipation surface area to further help heat dissipation.

[0009] Optionally, the punching sheet unit includes a plurality of punching sheets, each of which is provided with a hole portion, and the hole portion is suitable for forming a part of the cavity. Thus, a cavity can be formed in the core by a simple punching process, and the production process is simple and easy to implement, with low manufacturing cost. Furthermore, by forming a hole portion by opening a hole at a suitable position on each punching sheet, a spatial structure channel can be formed on the stator core after stacking multiple punching sheets to promote heat dissipation. The shapes and structures of the punching sheets themselves can be the same or different, so that the cavity design described in this embodiment can be flexibly applied to stator cores of various structural designs.

[0010] Optionally, the punching unit includes a plurality of punchings of the same shape, and the plurality of punchings are rotated in sequence by a preset angle to be stacked to obtain the punching unit, and each of the punchings is provided with a plurality of holes arranged along the circumference of the stator, wherein the plurality of holes respectively provided on each two adjacent punchings are interconnected along the axial direction of the stator to form a plurality of cavities. Thus, by rotating and stacking a plurality of punchings with the same opening layout, a stator core having a plurality of cavities inside is manufactured, and the manufacturing process is simple and the cost is low. Specifically, after rotating a plurality of punchings of the same design by a certain angle, a spatial structure channel is formed on the stator core to promote heat dissipation. Since the opening layout on each punching is the same, a single mold can be developed to produce the entire core, thereby reducing the mold opening cost and process complexity.

[0011] Optionally, the punch unit includes a first punch, a second punch, a third punch and a fourth punch arranged in sequence along the axial direction of the stator, each of the punches is provided with a first hole, a second hole, a third hole and a fourth hole arranged in sequence along the circumferential direction of the stator, and the at least one cavity includes a first cavity, a second cavity, a third cavity and a fourth cavity, wherein the first hole of the first punch, the second hole of the second punch, the third hole of the third punch and the fourth hole of the fourth punch are connected in pairs along the axial direction of the stator to form the first cavity, and the first punch The second hole of the second punch, the third hole of the second punch, the fourth hole of the third punch and the first hole of the fourth punch are connected in pairs along the axial direction of the stator to form the second cavity, the third hole of the first punch, the fourth hole of the second punch, the first hole of the third punch and the second hole of the fourth punch are connected in pairs along the axial direction of the stator to form the third cavity, and the fourth hole of the first punch, the first hole of the second punch, the second hole of the third punch and the third hole of the fourth punch are connected in pairs along the axial direction of the stator to form the fourth cavity. Thus, a single punch unit has four cavities distributed along the circumference of the stator, and each cavity passes through at least a part of the inside of the punch unit along the axial direction of the stator, so that the heat in the iron core can be naturally convected from the lower inlet along the cavity to the upper / side outlet, and then quickly dissipated to the outside of the iron core.

[0012] Optionally, for each of the cavities, the projections of the holes on adjacent punching sheets that are suitable for forming the cavities in the axial direction of the stator at least partially overlap, thereby ensuring that the front and rear holes of the multiple punching sheets remain connected after being stacked, so as to form a through channel inside the stator core formed by the stacking.

[0013] Optionally, the holes formed on at least two adjacent punching sheets completely overlap in their projections in the axial direction of the stator. As a result, the internal surface area of ​​the cavity is larger, which improves the flow speed of the airflow in the cavity and further improves the heat dissipation efficiency. Specifically, considering that a single punching sheet is relatively thin, the cross-sectional area of ​​the cavity section is increased by keeping the positions of the openings on multiple adjacent punching sheets consistent. Since the airflow speed in the cavity is slow due to viscosity near the cavity wall, the increased cross-sectional area is conducive to increasing the flow rate of the airflow in the cavity section. For example, the punching sheet unit in the stator using this embodiment can be obtained by stacking n types of punching sheets as a cycle, wherein the number of sheets of each type of punching sheet is multiple, and n is an integer greater than or equal to 2.

[0014] Optionally, along the axial direction of the stator, the hole portions on the punching sheets included in the punching sheet unit and suitable for forming the same cavity are projected clockwise or counterclockwise in the axial direction of the stator. Thus, the cavity extends inside the iron core along the axial direction of the stator and extends along the circumferential rotation of the stator, which is conducive to increasing the length of the cavity winding inside the iron core to optimize the heat dissipation effect, and is also conducive to improving the balance of heat dissipation at various locations of the iron core.

[0015] Optionally, for the punching units except the first and last punching units among the plurality of punching units, the holes opened on the first and last punching units in the punching units are connected to the edges of the punching units where they are located. Thus, it is ensured that the inlet and outlet of the cavity of the punching unit located in the middle are reliably connected to the outside of the iron core, so as to provide a channel for gas convection.

[0016] Optionally, the number of the multiple punches included in the punch unit is related to the size of the hole opened in each punch and the overlapping area of ​​the holes opened in adjacent punches in the axial direction of the stator. Therefore, the number of punches included in a minimum repeating unit is reasonably designed according to the size of the hole opened in each punch and the degree of overlap of the holes opened in adjacent punches, which is conducive to maximizing the use of the space on the core to arrange as many cavities as possible to obtain a better heat dissipation effect.

[0017] Optionally, the at least one cavity includes at least one channel group arranged along the circumference of the stator, wherein each channel group includes at least one first channel arranged along the axial direction of the stator. Thus, at least one channel group is arranged along the circumference of the stator, and the first channel in each channel group passes through at least a portion of the iron core along the axial direction of the stator, so that the heat in the iron core can be naturally convected from the lower inlet of each first channel along the first channel to the upper outlet and then quickly dissipated to the outside of the iron core. Furthermore, for each channel group, by providing a plurality of independent first channels, the number of inlets and outlets can be increased, and it is possible to further increase the heat dissipation surface area inside the iron core to better improve the heat dissipation performance.

[0018] Optionally, the at least one channel group includes a first channel group and a second channel group, and along the axial direction of the stator, the second channel group and the first channel group have a height difference, wherein the outlets connected to the first channels in the first channel group and the inlets connected to the first channels in the second channel group are located on the outer surface of the same side of the punching unit. Thus, the airflow enters the second channel group from the first channel group and is finally discharged from the motor, thereby increasing the cavity length that the airflow will pass through when flowing inside the iron core as a whole, so as to take out as much heat as possible to the outside of the iron core, and further enhance the heat dissipation effect.

[0019] Optionally, the cavity further includes a second channel, and at least a portion of adjacent first channels among the plurality of first channels are connected through the second channel. Thus, the heat dissipation surface area inside the core can be further increased, and the heat dissipation effect can be optimized.

[0020] Therefore, an embodiment of the present invention further provides a motor, comprising the above-mentioned stator. According to this embodiment, by using a stator with better heat dissipation effect, the energy loss of the motor is reduced and the power density is improved.

[0021] Therefore, an embodiment of the present invention further provides a household appliance, comprising: a housing; and the above-mentioned motor, which is arranged in the housing. By adopting this embodiment, by using a stator with better heat dissipation effect, the energy loss of the motor arranged in the household appliance is smaller and the power density is better, which is conducive to reducing the overall power consumption of the household appliance and better meeting the energy saving and environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a stator for a motor according to a first embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Cross-sectional view along AA direction;

[0024] Figure 3 yes Figure 1 Exploded view of the punch unit;

[0025] Figure 4 yes Figure 1 Schematic diagram of the middle punch;

[0026] Figure 5 yes Figure 1 A schematic diagram of a stator in a variation of the illustrated embodiment;

[0027] Figure 6 yes Figure 5 Cross-sectional view along direction BB;

[0028] Figure 7 yes Figure 5 Partial exploded view of the middle punch unit in area C;

[0029] Figure 8 yes Figure 1 A schematic diagram of a stator in another variation of the illustrated embodiment;

[0030] Fig. 9 yes Figure 8 Cross-sectional view along DD direction;

[0031] Fig.10 yes Figure 8 Exploded view of the punch unit;

[0032] Fig.11 is a schematic diagram of a stator for a motor according to a second embodiment of the present invention;

[0033] Fig.12 yes Fig.11 Cross-sectional view along EE direction;

[0034] Fig.13 yes Fig.11 Schematic diagram of the middle punch;

[0035] In the attached figure:

[0036] 1- stator; 10- through hole; 101- tooth; 11- core; 111- outer surface of the core; 112- fixing hole; 113- mounting hole; 12- punching unit; 121- punching; 122- hole; 122a- first hole; 122b- second hole; 122c- third hole; 122d- fourth hole; 123- first punching; 124- second punching; 125- third punching; 126- fourth punching; 13- cavity; 13a- inlet; 13b- outlet; 130- channel group; 131- first channel group; 132- second channel group; 133- first cavity; 134- second cavity; 135- third cavity; 136- fourth cavity; 137- first channel; 138- second channel; x- axial direction of stator; r- circumferential direction of stator; z- height direction of stator. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] Figure 1 is a schematic diagram of a stator 1 for a motor according to a first embodiment of the present invention, Figure 2 yes Figure 1 A cross-sectional view along the AA direction. In order to more clearly show the specific structure of the internal cavity 13 of the stator 1, Figure 2 Emphasis is placed on illustrative display of the area where the section is located.

[0039] Specifically, the motor (not shown) may include a stator 1 and a housing (not shown, also referred to as a housing), and the housing is suitable for fixing and protecting the stator 1. For example, the housing may include end covers arranged on both sides of the stator 1 along the axial direction of the stator 1. Furthermore, a wire package (not shown, also referred to as a coil) may be wound on the stator 1 to form a stator winding.

[0040] For ease of expression, in this embodiment, the axial direction of the stator 1 is recorded as the x direction, the circumferential direction is recorded as the r direction, and the height direction is recorded as the z direction. In this embodiment, the height direction of the stator 1 can be parallel to the direction of gravity when the stator 1 is stably placed. Among them, stable placement can specifically refer to the placement state when the motor is working. In this embodiment, the axial direction (for example, the x direction) and the circumferential direction (for example, the r direction) of the stator 1 can be respectively parallel to the axial direction and circumferential direction of the through hole 10 opened on the stator 1 for accommodating the rotor. For example, a plurality of teeth 101 are arranged at intervals around the through hole 10, and each tooth 101 can be used to wind a coil to form a stator.

[0041] Specifically, continue to refer to Figure 1 The stator 1 for the motor described in this embodiment includes an iron core 11, also called a stator iron core or an iron core. For example, the iron core 11 is provided with a through hole 10, and a plurality of teeth 101 are arranged around the through hole 10. In some embodiments, the iron core 11 can be obtained by stacking a plurality of punching sheets 121 along the x direction.

[0042] Further, combined with Figures 1 to 4 The core 11 includes at least one punching unit 12 arranged along the axial direction (eg, x direction) of the stator 1. Figure 3 For each punching unit 12, the punching unit 12 includes a plurality of punching sheets 121 arranged along the x direction. The punching unit 12 can be understood as the smallest repeating unit of the iron core 11. A single punching unit 12 can form the iron core 11, or a plurality of punching units 12 can be arranged in sequence along the x direction to obtain the iron core 11. Adjacent punching units 12 can be closely fitted together. In some embodiments, the punching sheet 121 can be, for example, a silicon steel sheet.

[0043] Further reference Figure 1 and Figure 2 The stator 1 further includes at least one cavity 13 formed inside the punching unit 12, and the outer surface of the punching unit 12 is respectively provided with an inlet 13a and an outlet 13b connected to each cavity 13. That is, for each cavity 13, an inlet 13a and an outlet 13b connected to the cavity 13 are provided on the outer surface of the punching unit 12, so as to ensure that air can enter the cavity 13 from the inlet 13a, flow along the cavity 13 to the outlet 13b, and finally flow out of the iron core 11. Figure 1 The curve with solid arrows in the figure exemplarily shows the flow path of the gas in the cavity 13.

[0044] In this embodiment, the inlet 13a and the outlet 13b are determined according to the placement of the stator 1. Specifically, according to the current placement of the stator 1, when the motor is working, the gas inlet is the inlet 13a, and the gas outlet is the outlet 13b. If the placement direction of the stator 1 changes, the upper and lower positions of the inlet 13a and the outlet 13b will change. For example, Figure 1 After the stator 1 is rotated 90 degrees clockwise around the axis extending in the x direction, the outlet 13b originally marked in the figure is located below the inlet 13a. Further, in this case, the original outlet 13b may become the inlet 13a, and the original inlet 13a may become the outlet 13b.

[0045] Furthermore, the outer surface of at least one punching unit 12 may jointly form the outer surface 111 of the core 11 .

[0046] Furthermore, along the axial direction (e.g., x direction) of the stator 1, the outlet 13b and the inlet 13a have a height difference. For example, both ends of the cavity 13 along the extension direction may be provided with openings connected to the outside of the core 11. When the stator 1 is stably placed, the lower opening along the z direction is the inlet 13a, and the upper opening is the outlet 13b.

[0047] Further, the extension path of the cavity 13 from the inlet 13a to the outlet 13b may be extended in a winding manner along the x direction and along the z direction. Figure 1 The cavities 13 distributed in different areas of the stator 1 along the r direction are respectively recorded as the first cavity 133, the second cavity 134, the third cavity 135 and the fourth cavity 136, and the flow paths of the gas along each cavity 13 are shown in the figure (the corresponding cavity is marked in the figure).

[0048] As a result, the heat dissipation performance of the stator 1 can be improved, which is beneficial to reducing the temperature of the motor and improving the efficiency and power density of the motor. Specifically, a three-dimensional cavity 13 is formed in the spatial structure inside the iron core 11 of the stator 1 to increase the heat dissipation surface area of ​​the punching sheet 121. Furthermore, there is a height difference between the inlet 13a and the outlet 13b of the cavity 13 in the axial direction of the stator 1 to form air convection, and the airflow takes away the heat emitted from the inside of the iron core 11 while flowing along the cavity 13. As a result, heat can be directly dissipated from the heat source to the air, further improving the heat dissipation efficiency. The stator 1 with better heat dissipation performance can reduce the overall temperature of the motor and improve the motor efficiency and power density, for example, the maximum output capacity.

[0049] Furthermore, the self-extraction force of the rising hot air is utilized to realize natural convection in the cavity 13. There is no need to set up an additional driving mechanism for exhaust, and the natural flow of air can be realized in the cavity 13, thereby improving the heat dissipation efficiency. When the motor is working and the stator 1 is heated, the heat on the stator winding is transferred to the iron core 11 nearby. After the air in the cavity 13 is heated, it flows from bottom to top along the cavity 13 while taking away the heat, and cold air is automatically replenished from below. The internal surface area of ​​multiple cavities 13 is greatly increased compared to the heat dissipation surface area of ​​the traditional stator core, thereby greatly improving the heat dissipation efficiency. Therefore, the stator 1 described in this embodiment can greatly reduce the temperature of the motor, thereby reducing the energy loss of the motor, improving efficiency while increasing the power density of the motor, so that the motor has a higher output at the same size.

[0050] In some embodiments, the inlet 13a and the outlet 13b may be opened on the outer surface of the punching unit 12 that is not covered by the housing.

[0051] In some embodiments, the plurality of cavities 13 may be independent, wherein each cavity 13 has its own inlet 13 a and outlet 13 b respectively formed on the outer surface of the punching unit 12 .

[0052] In a specific implementation, continue to refer to Figure 1 and Figure 2 The inlet 13a and the outlet 13b connected to the same cavity 13 can be respectively opened on the outer surfaces of different sides of the punching unit 12.

[0053] Specifically, for the same cavity 13, the inlet 13a and the outlet 13b of the cavity 13 can be respectively opened on the outer surface of the adjacent sides of the punching unit 12. Accordingly, the extension path of the cavity 13 inside the core 11 extends from one side of the core 11 to the adjacent other side.

[0054] For example, press Figure 1 and Figure 2 From the perspective shown, the core 11 is provided with a plurality of cavities 13, wherein a portion of the cavities 13 (for example, a plurality of cavities 13 in the first channel group 131, as shown in FIG. Figure 6 The plurality of cavities 13 in the second channel group 132 are arranged along the x direction, and the inlet 13a of each cavity 13 is located at the lower side of the core 11, and the outlet 13b is located at the right side of the core 11 in the perspective of the figure. Figure 6 As shown in the figure, the cavities 13 are arranged along the x direction and are located above the first channel group 131 as a whole, wherein the inlet 13a of each cavity 13 is located on the right side of the core 11 in the illustrated perspective, and the outlet 13b is located on the upper side of the core 11.

[0055] Thus, the winding length of the cavity 13 inside the core 11 can be increased, thereby increasing the heat dissipation surface area to further facilitate heat dissipation.

[0056] In some embodiments, on the basis of ensuring that there is a height difference along the x-direction, the inlet 13 a and the outlet 13 b of the same cavity 13 can be respectively opened on two opposite sides of the punching unit 12 .

[0057] In some embodiments, the inlet 13a and outlet 13b of the same cavity 13 may not be on the same plane, and the plane is perpendicular to the x direction. Thus, the cavity 13 extends at least a distance inside the core 11 along the x direction to ensure that the heat inside the core 11 is quickly dissipated through the cavity 13.

[0058] Specifically, the inlet 13 a and the outlet 13 b may be disposed on different punching sheets 121 of the punching sheet unit 12 , so that the cavity 13 extends along the x-direction.

[0059] In a specific implementation, continue to refer to Figures 1 to 4 The punching unit 12 may include a plurality of punching sheets 121 , each of which may be provided with a hole 122 , and the hole 122 is suitable for forming a part of the cavity 13 .

[0060] Specifically, the hole 122 can penetrate the punch 121 along the x direction. Accordingly, the wall of the punch 121 forming the hole 122 is a part of the cavity 13 .

[0061] Furthermore, the hole 122 formed on at least one punching sheet 121 may extend to the edge of the punching sheet 121 to form an inlet 13a or an outlet 13b. In this case, the hole 122 may also be understood as a notch.

[0062] Thus, the cavity 13 can be formed in the iron core 11 by a simple punching process, and the production process is simple and easy to implement, and the manufacturing cost is low. Further, by punching holes at appropriate positions on each punching sheet 121 to form a hole portion 122, a plurality of punching sheets 121 can be stacked to form a spatial structure channel on the stator 1 iron core 11 to promote heat dissipation.

[0063] In some embodiments, continue to refer to Figure 2 The greater the thickness of the punching sheet 121 along the x direction, the greater the cross-sectional area of ​​the cavity 13 formed by the opening on the punching sheet 121.

[0064] In some embodiments, the larger the diameter of the hole 122 is, the larger the cross-sectional area of ​​the cavity 13 formed by the hole 122 is.

[0065] In some embodiments, the shapes and structures of the punching sheets 121 can be the same or different, so that the design of the cavity 13 described in this embodiment can be flexibly applied to the stator 1 core 11 of various structural designs.

[0066] For example, four punching sheets 121 of different designs may be stacked in the x direction to form a punching sheet unit 12. A notch (i.e., a hole portion 122 extending to the edge of the first punching sheet 121) is sequentially opened below the surface of the first punching sheet 121 along the x direction, a hole portion 122 is opened on the second punching sheet 121, the notch on the first punching sheet 121 and the opening of the second punching sheet 121 are connected in the x direction, a hole portion 122 is opened on the third punching sheet 121 and the starting point of the opening is connected with the end of the opening on the second punching sheet 121 along the x direction, and a notch extending to the side is opened on the fourth punching sheet 121, and one end of the notch is connected with the end of the opening on the third punching sheet 121. In this way, every four punching sheets 121 can form a through channel (i.e., cavity 13) in the spatial structure, and the inlet 13a of the cavity 13 is formed on the front surface and the lower side of the punching sheet unit 12 through the notch of the first punching sheet 121, and the outlet 13b of the cavity 13 is formed on the side surface of the punching sheet unit 12 through the notch of the fourth punching sheet 121.

[0067] In a specific implementation, continue to refer to Figures 1 to 4 The punching unit 12 may include a plurality of punching sheets 121 of the same shape, and the plurality of punching sheets 121 are rotated in sequence by a preset angle to be stacked to obtain the punching unit 12, and each punching sheet 121 may be provided with a plurality of holes 122 arranged along the circumferential direction (e.g., r direction) of the stator 1, wherein the plurality of holes 122 respectively provided on each two adjacent punching sheets 121 are interconnected along the axial direction (e.g., x direction) of the stator 1 to form a plurality of cavities 13.

[0068] Specifically, the specific value of the preset angle can be determined according to the included angle (or the spacing) between adjacent hole portions 122 on the single punching sheet 121 .

[0069] For example, the figure takes a square punching sheet 121 as an example for exemplary display, and the holes 122 are symmetrically opened at the four corners of the square punching sheet 121. Accordingly, the preset angle can be 90 degrees. That is, by stacking multiple punching sheets 121 of the same design, each stacked sheet is rotated 90 degrees clockwise / counterclockwise, and finally stacked one by one to obtain the punching unit 12. Figure 3 An example of an example of stacking a stamping unit 12 in which each sheet is rotated 90 degrees clockwise is used for exemplary display.

[0070] For another example, the outer contour of the punching sheet 121 can be circular, and a plurality of holes 122 can be arranged around the through hole 10 at equal intervals along the r direction. At this time, the preset angle can be smaller than the deflection angle of the adjacent hole portions 122 relative to the axis of the through hole 10. Thus, by rotating and stacking multiple punching sheets 121 with the same opening layout, a stator 1 core 11 with multiple cavities 13 inside is manufactured, and the manufacturing process is simple and the cost is low. Specifically, after rotating multiple punching sheets 121 of the same design by a certain angle, a spatial structure channel is formed on the stator 1 core 11 to promote heat dissipation. Since the opening layout on each punching sheet 121 is the same, a single mold can be developed to produce the entire core 11, reducing the mold opening cost and process complexity.

[0071] In some embodiments, all holes 122 formed on a single punching sheet 121 are equidistant from the axis of the through hole 10 . In other words, the pattern formed by all holes 122 on the punching sheet 121 is a circle, and is concentric with the through hole 10 .

[0072] In some embodiments, the pattern formed by all the holes 122 opened on the single punching sheet 121 can be a plurality of concentric circles with the through hole 10. Figure 1 As shown in the figure, on the basis of opening a hole portion 122 at each of the four corners of the square punching sheet 121, additional hole portions 122 can be added on the outside of each hole portion 122 along the radial direction of the through hole 10, thereby, the layout of the multiple hole portions 122 on the punching sheet 121 and the through hole 10 together form three concentric circles.

[0073] In this embodiment, the core 11 can be obtained by stacking n types of punching sheets 121 as a cycle, wherein n is an integer greater than or equal to 2. A single cycle is a minimum repeating unit, that is, it corresponds to a single punching sheet unit 12. For example, Figures 5 to 7 The variation shown is exemplified by taking n=2 as an example. Figures 8 to 10 The variation shown is exemplified by taking n=3 as an example.

[0074] Furthermore, the number of each type of punching sheet 121 in a single punching sheet unit 12 may be one sheet, such as Figures 1 to 4 Alternatively, the number of sheets of each type of punching sheet 121 in a single punching sheet unit 12 may also be multiple sheets, such as Figures 5 to 10 In a variation, the number of at least one type of punching sheets 121 in a single punching sheet unit 12 may be different from the number of other types of punching sheets 121 .

[0075] Furthermore, for the n types of punches 121 in each punch unit 12, the difference between different types of punches 121 can be specifically reflected in the difference in the position / layout of the openings (for example, the holes 122 of different types of punches 121 in the x direction are not completely connected). Such a difference in the position / layout of the openings can be achieved by punches 121 with different structural designs, or by rotating punches 121 with the same structural design at a preset angle.

[0076] In a specific implementation, continue to refer to Figure 2 and Figure 3 The punching sheet unit 12 may include a first punching sheet 123, a second punching sheet 124, a third punching sheet 125 and a fourth punching sheet 126 arranged in sequence along the axial direction (eg, x direction) of the stator 1. Specifically, two adjacent punching sheets 121 may be in surface contact.

[0077] Further, combined with Figure 4 Each punching sheet 121 is provided with a first hole 122a, a second hole 122b, a third hole 122c and a fourth hole 122d arranged in sequence along the circumferential direction (e.g., r direction) of the stator 1. For example, the first hole 122a, the second hole 122b, the third hole 122c and the fourth hole 122d are arranged at equal intervals around the axis of the through hole 10, and the equal intervals may be, for example, a hole portion 122 is provided every 90 degrees.

[0078] Furthermore, the first hole 122 a and the fourth hole 122 d may extend to edges of the same side of the punching sheet 121 , respectively.

[0079] Further, combined with Figure 1 The at least one cavity 13 may include a first cavity 133, a second cavity 134, a third cavity 135 and a fourth cavity 136. For example, the four cavities 13 are distributed around the through hole 10 along the r direction and penetrate the punching unit 12 along the x direction.

[0080] exist Figure 6 In the variation example shown in FIG. 2, the first punching sheet 123, the second punching sheet 124, the third punching sheet 125 and the fourth punching sheet 126 may include two punching sheets 121 respectively. Fig. 9 In the variation example where n=3, the first punching sheet 123 , the second punching sheet 124 , the third punching sheet 125 and the fourth punching sheet 126 may include three punching sheets 121 respectively.

[0081] In some embodiments, the first hole 122a of the first punch 123, the second hole 122b of the second punch 124, the third hole 122c of the third punch 125, and the fourth hole 122d of the fourth punch 126 are connected in pairs along the axial direction (e.g., x direction) of the stator 1 to form a first cavity 133. From the perspective of the figure, the first cavity 133 is located at the lower right corner of the punch unit 12, the inlet 13a is opened at the bottom and front surface of the punch unit 12, and the outlet 13b is opened at the right side of the punch unit 12. Further, the lower inlet 13a and the upper side outlet 13b of the first cavity 133 are located on different punches 121, such as the first punch 123 and the fourth punch 126, respectively.

[0082] Similarly, the second hole 122b of the first punch 123, the third hole 122c of the second punch 124, and the fourth hole 122d of the third punch 125 are connected in pairs along the axial direction (e.g., x direction) of the stator 1 to form a second cavity 134. According to the perspective of the figure, the second cavity 134 can be located at the upper right corner of the punch unit 12, and the inlet 13a of the second cavity 134 is opened on the front surface of the punch unit 12 (reusing the second hole 122b of the first punch 123) and is located above the outlet 13b of the first cavity 133. The outlet 13b of the second cavity 134 can be opened above the punch unit 12 (reusing the fourth hole 122d of the third punch 125).

[0083] Similarly, the third hole 122c of the first punch 123 and the fourth hole 122d of the second punch 124, as well as the first hole 122a of the third punch 125 and the second hole 122b of the fourth punch 126, can each be connected in pairs along the axial direction (for example, the x direction) of the stator 1 to form two third cavities 135. From the perspective of the figure, the two third cavities 135 are both located in the upper left corner of the punch unit 12 and arranged front and back along the x direction. Among them, the inlet 13a of the previous third cavity 135 is opened on the left side of the punch unit 12 (reusing the fourth hole 122d of the second punch 124), and is located above the outlet 13b of the fourth cavity 136 also opened on the left side, and the outlet 13b of the previous third cavity 135 can be opened on the front surface of the punch unit 12 (reusing the third hole 122c of the first punch 123). The inlet 13a of the subsequent third cavity 135 is opened on the rear surface of the punch unit 12 (the second hole 122b of the reused fourth punch 126) and is located above the outlet 13b of the fourth cavity 136. The outlet 13b of the subsequent third cavity 135 can be opened above the punch unit 12 (the first hole 122a of the reused third punch 125).

[0084] Similarly, the first hole 122a of the second punch 124, the second hole 122b of the third punch 125, and the third hole 122c of the fourth punch 126 are connected in pairs along the axial direction (e.g., x direction) of the stator 1 to form a fourth cavity 136. From the perspective of the figure, the fourth cavity 136 can be located at the lower left corner of the punch unit 12, the inlet 13a is opened on the rear surface of the punch unit 12 (reusing the third hole 122c of the fourth punch 126), and the outlet 13b is opened on the left side of the punch unit 12 (reusing the first hole 122a of the second punch 124).

[0085] Therefore, a single punching unit 12 has four cavities 13 distributed along the circumference of the stator 1, and each cavity 13 passes through at least a portion of the interior of the punching unit 12 along the axial direction of the stator 1, so that the heat in the iron core 11 can be naturally convected from the lower inlet 13a along the cavity 13 to the upper / side outlet 13b, and then quickly dissipated to the outside of the iron core 11.

[0086] Furthermore, the core 11 obtained by arranging a plurality of punching units 12 along the x direction is provided with an inlet 13a and an outlet 13b of the cavity 13 on four sides (e.g., the upper and lower sides and the left and right sides in the perspective of the figure) along the circumferential direction (e.g., the r direction), and the airflow can flow more comprehensively inside the core 11 to quickly remove the heat inside the core 11. Furthermore, when the core 11 is placed in any posture, the inlet 13a and the outlet 13b opened on the appropriate side form a cavity 13 connected to the outside to achieve the purpose of heat dissipation.

[0087] In some embodiments, adjacent punching sheet units 12 may jointly form a cavity 13 , which is beneficial to increase the length of the cavity 13 extending in the core 11 and further improve the heat dissipation performance.

[0088] For example, continue to refer to Figure 3 In two adjacent punching units 12 along the x direction, the first hole 122a of the fourth punching sheet 126 in the previous punching unit 12 can form a second cavity 134 together with the second hole 122b of the first punching sheet 123, the third hole 122c of the second punching sheet 124 and the fourth hole 122d of the third punching sheet 125 in the next punching unit 12. Therefore, a longer second cavity 134 is conducive to better heat dissipation.

[0089] Furthermore, in this example, the inlet 13a of the second cavity 134 can reuse the first hole 122a of the fourth punch 126 in the previous punch unit 12. That is, the inlet 13a of the second cavity 134 can be opened on the right side of the iron core 11 in the perspective of the figure, and is located above the outlet 13b of the first cavity 133 which is also opened on the right side. As a result, the gas flowing out of the first cavity 133 of each of the two adjacent punch units 12 can re-enter the interior of the iron core 11 through the inlet 13a of the second cavity 134, which is conducive to increasing the distance of the airflow passing through the interior of the iron core 11 and improving the heat dissipation efficiency.

[0090] For another example, in two adjacent punching sheet units 12 along the x direction, the fourth hole 122d of the second punching sheet 124 and the third hole 122c of the first punching sheet 123 in the latter punching sheet unit 12 can form a third cavity 135 together with the second hole 122b of the fourth punching sheet 126 and the first hole 122a of the third punching sheet 125 in the former punching sheet unit 12. Therefore, compared with the third cavity 135 formed by the hole portions 122 on the two punching sheets 121 in the aforementioned embodiment, the third cavity 135 formed by the four punching sheets 121 in this example is longer and can take away more heat from the core 11.

[0091] Furthermore, in this example, the inlet 13a of the third cavity 135 can reuse the fourth hole 122d of the second punch 124 in the next punch unit 12, and the outlet 13b can reuse the first hole 122a of the third punch 125 in the previous punch unit 12. That is, the inlet 13a of the third cavity 135 is opened on the left side of the iron core 11 in the illustrated perspective, and is located above the outlet 13b of the fourth cavity 136 also opened on the left side, and the outlet 13b of the third cavity 135 is opened above the illustrated perspective of the iron core 11. As a result, the gas flowing out of the fourth cavity 136 of each of the two adjacent punch units 12 can re-enter the interior of the iron core 11 through the inlet 13a of the third cavity 135, which is conducive to increasing the distance of the airflow passing through the interior of the iron core 11 and improving the heat dissipation efficiency.

[0092] For another example, in two adjacent punching units 12 along the x direction, the fourth hole 122d of the first punching sheet 123 in the latter punching unit 12 can form a fourth cavity 136 together with the first hole 122a of the second punching sheet 124 of the former punching unit 12, the second hole 122b of the third punching sheet 125, and the third hole 122c of the fourth punching sheet 126. Thus, a longer fourth cavity 136 is conducive to better heat dissipation.

[0093] Further, in this example, the inlet 13a of the fourth cavity 136 can reuse the fourth hole 122d of the first punch 123 in the next punch unit 12, and the outlet 13b can reuse the first hole 122a of the second punch 124 in the previous punch unit 12. That is, the inlet 13a of the fourth cavity 136 is opened below the perspective of the iron core 11, and the outlet 13b is opened on the left side of the perspective of the iron core 11.

[0094] In a variation, by adjusting the size and location of the first hole 122a, the second hole 122b, the third hole 122c and the fourth hole 122d on the punching sheet 121, the second hole 122b of the first punching sheet 123, the third hole 122c of the second punching sheet 124, the fourth hole 122d of the third punching sheet 125 and the first hole 122a of the fourth punching sheet 126 in the same punching sheet unit 12 can be connected in pairs along the axial direction (e.g., x direction) of the stator 1 to form a second cavity 134. Thus, the second cavity 134 formed in a single punching sheet unit 12 makes full use of the hole portions 122 on all the punching sheets 121 to maximize the length of the cavity 13 and increase the heat dissipation surface area inside the core 11.

[0095] Similarly, by adjusting the size and position of the first hole 122a, the second hole 122b, the third hole 122c and the fourth hole 122d on the punch 121, the two third cavities 135 can be connected front to back into one. Among them, the inlet 13a can reuse the third hole 122c of the first punch 123, and the outlet 13b can reuse the second hole 122b of the fourth punch 126.

[0096] In some embodiments, the housing can avoid the hole 122 opened on the front surface of the punch 121 to avoid blocking the inlet 13a and / or outlet 13b of the cavity 13. For example, when the inlet 13a of the second cavity 134 is opened on the front surface of the punch unit 12, the housing covering both sides of the punch unit 12 along the x direction can avoid the second hole 122b of the first punch 123 to ensure that the second cavity 134 is reliably connected to the outside.

[0097] In a specific implementation, continue to refer to Figures 1 to 10 For each cavity 13 , the projections of the holes 122 on adjacent punching sheets 121 that are suitable for forming the cavity 13 in the axial direction (eg, x direction) of the stator 1 at least partially overlap.

[0098] Specifically, the openings and / or notches on two adjacent punching sheets 121 along the x-direction at least partially overlap.

[0099] Taking the first cavity 133 as an example, refer to Figure 2 , Figure 6 and Fig. 9, the projections of the first hole 122a of the first punch 123 and the second hole 122b of the second punch 124 in the x-direction overlap each other, the projections of the second hole 122b of the second punch 124 and the third hole 122c of the third punch 125 in the x-direction overlap each other, and the projections of the third hole 122c of the third punch 125 and the fourth hole 122d of the fourth punch 126 in the x-direction overlap each other. The overlap specifically means that along the flow direction of the airflow in the cavity 13, the end of the previous hole portion 122 and the starting point of the next hole portion 122 are connected front to back along the x-direction.

[0100] Thus, it is ensured that the front and rear holes 122 remain connected after the plurality of punching sheets 121 are stacked, so as to form a through passage inside the stacked stator 1 core 11 .

[0101] In one specific implementation, reference Figure 6 and Fig. 9 The projections of the holes 122 formed on at least two adjacent punching sheets 121 in the axial direction (eg, x direction) of the stator 1 may completely overlap.

[0102] That is, the multiple sheets 121 in at least one sheet unit 12 in the stator 1 can be obtained by stacking n sheets 121 in a cycle. The number of sheets of each sheet 121 is multiple (i.e., greater than or equal to 2), and n is an integer greater than or equal to 2.

[0103] For example, Figures 5 to 7 In the shown variation, a single punching unit 12 may include two first punching sheets 123, two second punching sheets 124, two third punching sheets 125 and two fourth punching sheets 126, which are stacked in sequence along the x direction.

[0104] For example, Figures 8 to 10 In the shown variation, a single punching unit 12 may include three first punching sheets 123, three second punching sheets 124, three third punching sheets 125 and three fourth punching sheets 126, which are stacked in sequence along the x direction.

[0105] As a result, the internal surface area of ​​the cavity 13 is larger, which improves the flow speed of the airflow in the cavity 13 and further improves the heat dissipation efficiency. Specifically, considering that the single punching sheet 121 is relatively thin, the cross-sectional area of ​​the cavity 13 is increased by making the opening positions on multiple adjacent punching sheets 121 consistent. Since the airflow speed in the cavity 13 near the cavity 13 wall is slow due to the viscosity, the increased cross-sectional area is conducive to increasing the flow speed of the airflow in the cavity 13.

[0106] In a specific implementation, along the axial direction of the stator 1 (eg, x direction), the projection of the hole portion 122 for forming the same cavity 13 on each punching sheet 121 included in the punching unit 12 in the axial direction of the stator 1 can be deflected clockwise or counterclockwise.

[0107] Taking the first cavity 133 as an example, continue to refer to Figure 3 , Figure 7 and Fig.10 The first hole 122a of the first punch 123, the second hole 122b of the second punch 124, the third hole 122c of the third punch 125 and the fourth hole 122d of the fourth punch 126 are sequentially deflected counterclockwise from the lower edge of the punch unit 12 to the right edge according to the perspective of the figure. Correspondingly, the first cavity 133 arranged at the lower right corner of the punch unit 12 extends from the lower part along the x direction toward the inside of the punch unit 12, and at the same time extends counterclockwise according to the perspective of the figure.

[0108] Thus, the cavity 13 extends inside the core 11 along the axial direction of the stator 1 (e.g., the x direction), and rotates and extends along the circumferential direction (e.g., the r direction) of the stator 1. This is beneficial to increase the length of the cavity 13 extending in a meandering manner inside the core 11 to optimize the heat dissipation effect, and is also beneficial to improve the balance of heat dissipation at various locations of the core 11.

[0109] In a specific implementation, continue to refer to Figure 2 , Figure 6 and Fig. 9 For the punching units 12 other than the first and last punching units 12 among the plurality of punching units 12 , the holes 122 opened on the first and last punching units 121 in the punching units 12 can be connected to the edges of the punching units 121 where they are located.

[0110] That is, for the punching unit 12 sandwiched between the first and last punching units 12, the hole 122 opened on the first and last punching units 121 of the punching unit 12 extends along the extension direction to the edge of the punching unit 121 to form a notch. Correspondingly, for the cavity 13 formed on the punching unit 12 sandwiched between the punching units 12, the inlet 13a and the outlet 13b of the cavity 13 are opened on the side surface of the punching unit 12 in the r direction.

[0111] Thus, it is ensured that the inlet 13a and the outlet 13b of the cavity 13 of the punching unit 12 located in the middle are reliably connected to the outside of the iron core 11 to provide a channel for gas convection.

[0112] In some embodiments, the openings on the first and last punching sheets 121 of the first and last punching sheets 12 of the plurality of punching sheets 12 may also extend along the extension direction to connect to the edge of the punching sheets 121. Thus, when the housing covers the outer surface of the first punching sheet 121 of the first punching sheet unit 12 arranged along the x direction and the outer surface of the last punching sheet 121 of the last punching sheet unit 12, the cavity 13 on the first and last punching sheet units 12 can still ensure reliable connection to the outside of the iron core 11.

[0113] In a specific implementation, the number of the multiple punches 121 included in the punch unit 12 may be related to the size of the hole 122 opened in each punch 121 and the overlapping area of ​​the holes 122 opened on adjacent punches 121 in the axial direction (e.g., x direction) of the stator 1.

[0114] For example, the larger the size of the hole 122 in the extending direction of a single punch 121, the smaller the number of different punches 121 stacked to obtain the cavity 13 that penetrates the inside of the punch unit 12. Accordingly, the smaller the number of punches 121 included in a single punch unit 12.

[0115] For another example, the larger the overlapping area of ​​the holes 122 opened on adjacent punches 121 in the x direction, the more punches 121 need to be rotated and stacked to obtain a cavity 13 that penetrates the interior of the punch unit 12 and opens on at least two sides thereof. Accordingly, a single punch unit 12 includes more punches 121.

[0116] Therefore, the number of punching sheets 121 included in a minimum repeating unit is reasonably designed according to the size of the openings on each punching sheet 121 and the degree of overlap of the openings on adjacent punching sheets 121. This is conducive to maximizing the use of the space on the core 11 to arrange as many cavities 13 as possible to obtain a better heat dissipation effect.

[0117] In a specific implementation, continue to refer to Figure 2 , Figure 6 and Fig. 9 At least one cavity 13 may include at least one channel group 130 arranged along the circumferential direction (eg, r direction) of the stator 1. Each channel group 130 may include at least one first channel 137 arranged along the axial direction (eg, x direction) of the stator 1.

[0118] Specifically, the cavities 13 disposed in different regions of the core 11 along the r direction may be divided into different channel groups 130 .

[0119] Furthermore, in the same channel group 130 , the inlets 13a of the first channels 137 may be located at the same side of the core 11 . Similarly, the outlets 13b of the first channels 137 in the same channel group 130 may also be located at the same side of the core 11 .

[0120] Furthermore, the inlets 13a of the first channels 137 in different channel groups 130 may be located at different sides of the core 11 . Similarly, the outlets 13b of the first channels 137 in different channel groups 130 may also be located at different sides of the core 11 .

[0121] For example, when n=1, four holes 122 are provided on each punching sheet 121 at intervals around the r direction, and the stator 1 includes four punching sheet units 12, refer to Figure 1 and Figure 2 The core 11 may include four channel groups 130, which are respectively located at the four corners of the rectangular punching sheet 121, and each channel group 130 includes four first channels 137. Figure 1 Take the stacking arrangement of four punching units 12 along the x direction as an example for exemplary display. Figure 2 The internal structure is exemplarily demonstrated by taking three punching units 12 as an example.

[0122] Specifically, the four first cavities 133 belong to the same channel group 130, the four second cavities 134 belong to the same channel group 130, the four third cavities 135 belong to the same channel group 130, and the four fourth cavities 136 belong to the same channel group 130. Among them, the first cavity 133, the second cavity 134, the third cavity 135 and the fourth cavity 136 can all be regarded as the first channel 137.

[0123] For another example, when n=2, four holes 122 are provided on each punching sheet 121 at intervals around the r direction, and the stator 1 includes two punching sheet units 12, refer to Figure 5 and Figure 6 The core 11 may include four channel groups 130 , which are respectively located at four corners of the rectangular punching sheet 121 , and each channel group 130 includes two first channels 137 .

[0124] Specifically, the two first cavities 133 belong to the same channel group 130, the two second cavities 134 belong to the same channel group 130, the two third cavities 135 belong to the same channel group 130, and the two fourth cavities 136 belong to the same channel group 130. Among them, the first cavity 133, the second cavity 134, the third cavity 135 and the fourth cavity 136 can all be regarded as the first channel 137.

[0125] For another example, when n=3, four holes 122 are provided on each punching sheet 121 at intervals around the r direction, and the stator 1 includes two punching sheet units 12, refer to Figure 8 and Fig. 9 The core 11 may include two channel groups 130, which are respectively located at the four corners of the rectangular punching sheet 121, and each channel group 130 includes two first channels 137. Figure 8Take two punching units 12 stacked and arranged along the x direction as an example for exemplary display. Fig. 9 The internal structure is exemplarily demonstrated by taking one of the punching units 12 as an example.

[0126] Specifically, the two first cavities 133 belong to the same channel group 130, the two second cavities 134 belong to the same channel group 130, the two third cavities 135 belong to the same channel group 130, and the two fourth cavities 136 belong to the same channel group 130. Among them, the first cavity 133, the second cavity 134, the third cavity 135 and the fourth cavity 136 can all be regarded as the first channel 137.

[0127] Furthermore, the first channel 137 can be formed by opening a hole on a punching sheet 121 in a single punching sheet unit 12. Taking the first cavity 133 as an example, four punching sheets 121 in a single punching sheet unit 12 can form a first cavity 133.

[0128] Alternatively, the first channel 137 may also be formed by the punching sheets 121 of the adjacent punching sheet units 12. Taking the second cavity 134 as an example, the punching sheets 121 of the adjacent punching sheet units 12 together form a second cavity 134.

[0129] Thus, at least one channel group 130 is distributed along the circumferential direction (for example, r direction) of the stator 1, and the first channel 137 in each channel group 130 passes through at least a portion of the iron core 11 along the axial direction (for example, x direction) of the stator 1, so that the heat in the iron core 11 can be naturally convected from the lower inlet 13a of each first channel 137 along the first channel 137 to the upper outlet 13b, and then quickly dissipated to the outside of the iron core 11.

[0130] Furthermore, for each channel group 130, by providing a plurality of independent first channels 137, the number of inlets 13a and outlets 13b can be increased, and the heat dissipation surface area inside the core 11 may be further increased to better improve the heat dissipation performance.

[0131] In a specific implementation, continue to refer to Figures 1 to 10 At least one channel group 130 may include a first channel group 131 and a second channel group 132 , and along the axial direction (eg, x direction) of the stator 1 , the second channel group 132 and the first channel group 131 may have a height difference.

[0132] For example, refer to Figure 6 The first channel group 131 may include at least one first channel 133 arranged along the x direction, and the second channel group 132 may include at least one second channel 134 arranged along the x direction. In the z direction, the first channel group 131 may be located below the second channel group 132.

[0133] For another example, the first channel group 131 may include at least one fourth channel 136 arranged along the x direction, and the second channel group 132 may include at least one third channel 135 arranged along the x direction. In the z direction, the first channel group 131 may be located below the second channel group 132.

[0134] Furthermore, the outlet 13 b communicating with the first channels 137 in the first channel group 131 and the inlet 13 a communicating with the first channels 137 in the second channel group 132 may be located on the outer surface of the same side of the punching unit 12 .

[0135] Taking the example that the first channel group 131 includes the first cavity 133 and the second channel group 132 includes the second cavity 134, the outlet 13b of the first channel group 131 is located on the right side of the iron core 11, and the inlet 13a of the second channel group 132 is also located on the right side of the iron core and above the outlet 13b of the first channel group 131. The outlet 13b of the first channel group 131 can reuse the fourth hole 122d of the fourth punch 123, and the inlet 13a of the second channel group 132 can reuse the first hole 122a of the fourth punch 126.

[0136] Taking the example that the first channel group 131 includes the fourth cavity 136 and the second channel group 132 includes the third cavity 135, the outlet 13b of the first channel group 131 is located on the left side of the iron core 11, and the inlet 13a of the second channel group 132 is also located on the left side of the iron core and above the outlet 13b of the first channel group 131. The outlet 13b of the first channel group 131 can reuse the first hole 122a of the second punching sheet 124, and the inlet 13a of the second channel group 132 can reuse the fourth hole 122b of the second punching sheet 124.

[0137] Therefore, the airflow enters the second channel group 132 from the first channel group 131 and is finally discharged from the motor, thereby increasing the length of the cavity 13 through which the airflow flows inside the core 11 as a whole, so as to bring as much heat as possible to the outside of the core 11, further enhancing the heat dissipation effect.

[0138] In one specific implementation, reference Figures 11 to 13 The cavity 13 may further include a second channel 138 , and at least a portion of adjacent first channels 137 among the plurality of first channels 137 are connected through the second channel 138 .

[0139] Specifically, by increasing the number of openings on the punching sheets 121 , the cavity 13 obtained by rotating and stacking multiple punching sheets 121 can include, in addition to the first channel 137 extending from bottom to top, a second channel 138 extending along the axial direction (eg, x direction) of the stator 1 .

[0140] For example, each first channel 137 in each channel group 130 is connected through the corresponding second channel 138 .

[0141] Further, the second channel 138 can be used to connect the first channel 137 of the adjacent minimum repeating unit (e.g., the punching unit 12). For example, on the basis of the vertical passages originally extending around the circumference of the stator 1, a passage extending in a straight line along the axial direction of the stator 1 is added to connect the vertical passages.

[0142] Thereby, the heat dissipation surface area inside the core can be further increased, and the heat dissipation effect can be optimized.

[0143] In some embodiments, the number of openings on the punching sheet 121 can be increased by increasing the density of the holes 122 arranged along the circumferential direction (eg, r direction) of the stator 1. Fig.13 For each square punching sheet 121, two holes 122 may be provided at each corner of the punching sheet 121, and one of the two holes 122 extends to the edge of the punching sheet 122 in a direction away from the other. Furthermore, the holes 122 provided at the four corners may be vertically symmetrical and bilaterally symmetrical.

[0144] In some embodiments, the hole portion 122 may extend in an arc shape. Furthermore, the curvature of the arc may match the curvature of the through hole 10 .

[0145] In some embodiments, each punching sheet 121 may be provided with fixing holes 112 spaced apart along the circumferential direction r. For each punching sheet unit 12, the fixing holes 112 on all the punching sheets 121 included in the punching sheet unit 12 are connected along the x direction. Further, each fixing hole 112 is suitable for cooperating with a fixing member such as a screw to fix at least one punching sheet unit 12 as a whole.

[0146] In some embodiments, each punching sheet 121 may be provided with mounting holes 113 spaced apart along the circumferential direction r for mounting an insulating frame (not shown). In practical applications, the mounting holes 113 may be omitted.

[0147] The embodiment of the present invention further provides a motor, comprising the above Figures 1 to 13 The stator 1 shown in any of the embodiments shown in the drawings. By using the stator 1 with better heat dissipation effect, the energy loss of the motor is reduced and the power density is improved.

[0148] The embodiment of the present invention further provides a household appliance, comprising: a housing; a motor, which is arranged in the housing, and the motor comprises the above-mentioned Figures 1 to 13The stator 1 of any embodiment shown. In some embodiments, the household appliance may be, for example, a refrigeration appliance, a washing machine, a washer-dryer, a range hood, etc. The refrigeration appliance may include a refrigerator, a freezer, etc. By adopting this embodiment, by using a stator 1 with a better heat dissipation effect, the energy loss of the motor provided in the household appliance is smaller and the power density is better, which is conducive to reducing the overall power consumption of the household appliance and better meeting the energy saving and environmental protection requirements.

[0149] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in this disclosure are intended to be illustrative rather than limiting, unless otherwise stated. In specific implementations, the technical features of one or more dependent claims may be combined with the technical features of the independent claims, and the technical features from the corresponding independent claims may be combined in any appropriate manner rather than just by the specific combinations listed in the claims.

[0150] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A stator for a motor, characterized in that: include: An iron core (11) comprising at least one punching sheet unit (12) arranged along the axial direction of the stator; At least one cavity (13) is formed inside the punch unit (12), and an outer surface of the punch unit (12) is respectively provided with an inlet (13a) and an outlet (13b) connected to each of the cavities (13), wherein along the axial direction of the stator, the outlet (13b) and the inlet (13a) have a height difference.

2. The stator according to claim 1, characterized in that: An inlet (13a) and an outlet (13b) communicating with the same cavity (13) are respectively arranged on the outer surfaces of different sides of the punching unit (12).

3. The stator according to claim 1, characterized in that: The punching sheet unit (12) comprises a plurality of punching sheets (121), each of the punching sheets (121) being provided with a hole portion (122), and the hole portion (122) is suitable for forming a portion of the cavity (13).

4. The stator according to claim 1, characterized in that: The punching sheet unit (12) comprises a plurality of punching sheets (121) of the same shape. The plurality of punching sheets (121) are rotated in sequence by a preset angle to be stacked to obtain the punching sheet unit (12). Each of the punching sheets (121) is provided with a plurality of hole portions (122) arranged along the circumference of the stator. The plurality of hole portions (122) respectively provided on each two adjacent punching sheets (121) are connected to each other along the axial direction of the stator to form a plurality of cavities (13).

5. The stator according to claim 3 or 4, characterized in that: The punching sheet unit (12) comprises a first punching sheet (123), a second punching sheet (124), a third punching sheet (125) and a fourth punching sheet (126) which are sequentially arranged along the axial direction of the stator; each of the punching sheets (121) is provided with a first hole (122a), a second hole (122b), a third hole (122c) and a fourth hole (122d) which are sequentially arranged along the circumferential direction of the stator; the at least one cavity (13) comprises a first cavity (133), a second cavity (134), a third cavity (135) and a fourth cavity (136). (134), a third cavity (135) and a fourth cavity (136), wherein the first hole (122a) of the first punching sheet (123), the second hole (122b) of the second punching sheet (124), the third hole (122c) of the third punching sheet (125) and the fourth hole (122d) of the fourth punching sheet (126) are connected in pairs along the axial direction of the stator to form the first cavity (133), and the second hole (122c) of the first punching sheet (123) is connected to the stator via the second hole (122d). b), the third hole (122c) of the second punching sheet (124), the fourth hole (122d) of the third punching sheet (125), and the first hole (122a) of the fourth punching sheet (126) are connected in pairs along the axial direction of the stator to form the second cavity (134), the third hole (122c) of the first punching sheet (123), the fourth hole (122d) of the second punching sheet (124), the first hole (122a) of the third punching sheet (125) are connected in pairs along the axial direction of the stator to form the second cavity (134), and the third hole (122c) of the first punching sheet (123), the fourth hole (122d) of the second punching sheet (124), the first hole (122a) of the third punching sheet (125) are connected in pairs along the axial direction of the stator to form the second cavity (134). The second holes (122b) of the fourth punch (126) are connected in pairs along the axial direction of the stator to form the third cavity (135); the fourth hole (122d) of the first punch (123), the first hole (122a) of the second punch (124), the second hole (122b) of the third punch (125) and the third hole (122c) of the fourth punch (126) are connected in pairs along the axial direction of the stator to form the fourth cavity (136).

6. The stator according to claim 3 or 4, characterized in that: For each of the cavities (13), projections of holes (122) opened on adjacent punching sheets (121) and suitable for forming the cavities (13) in the axial direction of the stator at least partially overlap.

7. The stator according to claim 6, characterized in that The projections of the holes (122) opened on at least two adjacent punching sheets (121) in the axial direction of the stator completely overlap.

8. The stator according to claim 3 or 4, characterized in that: Along the axial direction of the stator, the projection of the hole portion (122) suitable for forming the same cavity (13) opened on each punching sheet (121) included in the punching sheet unit (12) on the axial direction of the stator is deflected clockwise or counterclockwise.

9. The stator according to claim 3 or 4, characterized in that: For the punching sheet units (12) other than the first and last punching sheet units (12) among the plurality of punching sheet units (12), the holes (122) opened on the first and last punching sheets (121) in the punching sheet units (12) are connected to the edges of the punching sheets (121) where they are located.

10. The stator according to claim 3 or 4, characterized in that: The number of the plurality of punching sheets (121) included in the punching sheet unit (12) is related to the size of the hole portion (122) opened in each of the punching sheets (121) and the overlapping area of ​​the hole portions (122) opened on adjacent punching sheets (121) in the axial direction of the stator.

11. The stator according to claim 1, characterized in that: The at least one cavity (13) comprises at least one channel group (130) arranged along the circumference of the stator, wherein each channel group (130) comprises at least one first channel (137) arranged along the axial direction of the stator.

12. The stator according to claim 11, characterized in that The at least one channel group (130) comprises a first channel group (131) and a second channel group (132), wherein along the axial direction of the stator, the second channel group (132) and the first channel group (131) have a height difference, wherein an outlet (13b) connected to each first channel (137) in the first channel group (131) and an inlet (13a) connected to each first channel (137) in the second channel group (132) are located on the outer surface of the same side of the punching unit (12).

13. The stator according to claim 11, characterized in that The cavity (13) further comprises a second channel (138), and at least a portion of adjacent first channels (137) among the plurality of first channels (137) are connected via the second channel (138).

14. A motor, characterized in that: include: A stator as claimed in any one of claims 1 to 13.

15. A household appliance, characterized in that: include: Box; The motor described in claim 14 is arranged in the housing.

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