Stator core, motor and household appliance

Abstract

The invention provides a stator iron core, a motor and a household electrical appliance, the stator iron core comprises a plurality of iron core units, the plurality of iron core units are connected in sequence, the plurality of iron core units are enclosed to form the stator iron core along the circumferential direction of the stator iron core, the plurality of iron core units comprise a first iron core and a second iron core, the first iron core is provided with a first insertion part, and the second iron core is provided with a second insertion part; a second inserting part is arranged on the second iron core, and the first inserting part and the second inserting part are mutually inserted; any iron core unit comprises a tooth part; and the yoke parts are connected with the tooth parts, and an axial through hole is formed between the yoke parts on every two adjacent iron core units.

Description

Technical Field

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

[0002] At present, some household appliances are equipped with built-in permanent magnet motors. These built-in permanent magnet motors have the problem of high vibration and noise during operation, which affects the user experience of household appliances. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, in the first aspect, the present invention proposes a stator core, comprising: a plurality of core units, the plurality of core units being connected in sequence, and along the circumference of the stator core, the plurality of core units are enclosed to form the stator core, the plurality of core units comprising a first core and a second core, the first core being provided with a first plug-in portion, the second core being provided with a second plug-in portion, the first plug-in portion and the second plug-in portion being plugged into each other; any core unit comprising: a tooth portion; a yoke portion connected to the tooth portion, and an axial through hole being formed between the yoke portions on two adjacent core units.

[0005] The stator core provided by the present invention is formed of multiple core units. The core units at the front end and the core units at the rear end are plugged into each other, making the core units at the front end and the rear end difficult to separate, ensuring that the multiple core units are stably enclosed to form the stator core. The core unit at the front end is defined as the first core, and the core unit at the rear end is defined as the second core. A first plug-in portion is provided on the first core, and a second plug-in portion is provided on the second core. The first plug-in portion and the second plug-in portion are capable of plugging into each other.

[0006] The yoke is arranged on the radial outside of the tooth part, and the yokes of two adjacent core units are connected. When multiple core units are bent into a circle, an axial through hole is formed between the two adjacent yokes. The axial through hole is arranged to facilitate the close fit of the two adjacent yokes.

[0007] In the present invention, a plug-in structure and an axial through-hole are provided between the first and second cores. Axial through-holes are provided between any adjacent core units, improving the structural symmetry of the stator core. This effectively reduces the cogging torque of the permanent magnet motor, weakens torque ripple, and helps reduce vibration and noise during operation. When such a permanent magnet motor is installed in a household appliance, this improves the user experience of the household appliance. Furthermore, by providing axial through-holes between any adjacent core units, a motor equipped with this stator core has the advantages of low magnetic flux leakage and high manufacturing efficiency, which helps improve the efficiency of the permanent magnet motor.

[0008] In addition, the stator core in the above technical solution provided by the present invention may also have the following additional technical features:

[0009] In some technical solutions, optionally, between the first iron core and the second iron core, the axial through hole and the first plug-in portion are distributed along the radial direction of the stator iron core.

[0010] The first and second cores are connected by a first and second connecting portions, as well as an axial through-hole. The first connecting portion and the axial through-hole are radially distributed, and the first and second connecting portions are less likely to interfere with the axial through-hole. The axial through-hole between the first and second cores improves the structural symmetry of the stator core, reduces the cogging torque of the permanent magnet motor, and weakens torque ripple, thereby reducing vibration and noise during operation of the permanent magnet motor.

[0011] In some technical solutions, optionally, between the first iron core and the second iron core, the axial through hole is located radially outside the first plug-in portion.

[0012] In order to bend adjacent core units, an axial through hole is provided between two adjacent core units. The axial through hole is used to provide a clearance space for the positions of the two adjacent core units being bent, thereby ensuring that the two adjacent core units can fit tightly together. The axial through hole is usually provided in the yoke near the radially outer edge. When the first plug-in portion and the axial through hole are distributed radially, the axial through hole is provided radially outward of the first plug-in portion. This makes the spacing between the axial through holes at different positions and the axis substantially the same, thereby further improving the symmetry of the stator core, further reducing the cogging torque of the permanent magnet motor, weakening the torque pulsation, and helping to reduce the vibration and noise of the permanent magnet motor during operation.

[0013] In some technical solutions, optionally, the first plug-in part is inserted into the second plug-in part; the stator core is cut along the radial direction of the stator core, the area of ​​the second plug-in part is larger than the area of ​​the first plug-in part, and an axial through hole is formed between the inner wall of the second plug-in part and the first plug-in part.

[0014] The slots limit the position of the plug, preventing the first and second cores from separating easily, thereby ensuring the structural stability of the stator core. Along the radial direction of the stator core, the slots have a larger area than the plugs, resulting in a gap between the inner wall of the slots and the plugs. This gap serves as an axial through-hole. The axial through-hole between the plugs and the slots improves the structural symmetry of the stator core, reduces the cogging torque of the permanent magnet motor, and weakens torque ripple, thereby reducing vibration and noise during operation.

[0015] In some technical solutions, optionally, a first notch is provided on one of the two adjacent core units, and an axial through hole is formed between the first notch and the other core unit; or a second notch is provided on one of the two adjacent core units, and a third notch is provided on the other, and an axial through hole is formed between the second notch and the third notch.

[0016] Among two adjacent core units, a first recess may be provided on one core unit, and the other core unit abuts against the opening of the first recess, with the space inside the first recess serving as an axial through hole.

[0017] Alternatively, in two adjacent core units, a second recess is provided on one core unit and a third recess is provided on the other core unit, the second recess and the third recess are connected to each other, and the space inside the second recess and the third recess serves as an axial through hole.

[0018] In some technical solutions, optionally, along the radial direction of the stator core, a stator slot is formed between two adjacent core units, and the stator slot has a center line, which passes through the axial through hole.

[0019] In some technical solutions, optionally, the multiple stator cores also include: a third core; the axial through hole includes a first axial through hole and a second axial through hole, the first axial through hole is located between the first core and the second core, and the second axial through hole is provided between the first core and the third core, between the second core and the third core, and between two adjacent third cores; along the radial direction of the stator core, the area ratio of the first axial through hole to the second axial through hole is A, and A satisfies 0.1≤A≤7.

[0020] Among the multiple core units, except for the first core and the second core, the other core units are called the third core, and an axial through hole is set between any two adjacent core units, wherein a first axial through hole is set between the first core and the second core, a second axial through hole is set between the first core and the adjacent third core, a second axial through hole is set between the second core and the adjacent third core, and a second axial through hole is set between adjacent third cores.

[0021] The closer the area ratio of the first axial through hole to the second axial through hole is, the smaller the cogging torque of the permanent magnet motor is. Therefore, when the area ratio of the first axial through hole to the second axial through hole satisfies A and 0.1≤A≤7, the cogging torque of the permanent magnet motor is small, which can weaken the torque pulsation and help reduce the vibration and noise of the permanent magnet motor during operation.

[0022] In some technical solutions, optionally, the multiple stator cores also include: a third core; the axial through hole includes a first axial through hole and a second axial through hole, the first axial through hole is located between the first core and the second core, and a second axial through hole is provided between the first core and the third core, between the second core and the third core, and between two adjacent third cores; the maximum length of the first axial through hole is set to h1, the maximum width of the first axial through hole is set to w1, the maximum length of the second axial through hole is set to h0, and the maximum width of the second axial through hole is set to w0, wherein h1, w1, h0 and w0 satisfy, 0.1<(h1×w1) / (h0×w0)<7.

[0023] In some technical solutions, optionally, along the radial direction of the stator core, the maximum length of the yoke is yk, and h1 and yk satisfy 0.05×yk

[0024] In some technical solutions, optionally, the multiple stator cores also include: a third core; the axial through hole includes a first axial through hole and a second axial through hole, the first axial through hole is located between the first core and the second core, and a second axial through hole is provided between the first core and the third core, between the second core and the third core, and between two adjacent third cores; the maximum length of the first axial through hole is set to h2, the maximum width of the first axial through hole is set to w2, the maximum length of the second axial through hole is set to h0, and the maximum width of the second axial through hole is set to w0, wherein h2, w2, h0 and w0 satisfy, 0.1<(h2×w2) / (h0×w0)<7.

[0025] In some technical solutions, optionally, along the radial direction of the stator core, the maximum length of the yoke is yk, and h2 and yk satisfy 0.05×yk<h2<0.7×yk.

[0026] In a second aspect, the present invention provides a motor, comprising: a stator core as in the first aspect.

[0027] In a third aspect, the present invention provides a household appliance, comprising: the motor as in the second aspect.

[0028] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0030] Figure 1 FIG1 shows one of the structural schematic diagrams of the stator core in an embodiment of the present invention;

[0031] Figure 2 Shown​ Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 One of the partial schematic diagrams of the first iron core and the second iron core in an embodiment of the present invention is shown;

[0033] Figure 4 FIG2 shows a second structural schematic diagram of a stator core according to an embodiment of the present invention;

[0034] Figure 5 Shown Figure 4 Enlarged view of point B in the middle;

[0035] Figure 6 A second partial schematic diagram of the first iron core and the second iron core in an embodiment of the present invention is shown;

[0036] Figure 7 A third partial schematic diagram of the first iron core and the second iron core in an embodiment of the present invention is shown;

[0037] Figure 8 A fourth partial schematic diagram of the first iron core and the second iron core in an embodiment of the present invention is shown;

[0038] Figure 9 FIG5 shows a fifth partial schematic diagram of the first iron core and the second iron core in an embodiment of the present invention;

[0039] Figure 10 FIG6 shows a sixth partial schematic diagram of the first iron core and the second iron core in an embodiment of the present invention;

[0040] Figure 11 shows a partial schematic diagram of two adjacent third cores in an embodiment of the present invention;

[0041] Figure 12 A graph showing cogging torque as a function of A (area of ​​the first axial through hole / area of ​​the second axial through hole) in an embodiment of the present invention is shown;

[0042] Figure 13 The figure shows a schematic structural diagram of the stator core before end-to-end splicing in an embodiment of the present invention.

[0043] Reference numerals:

[0044] 100 stator core, 110 core unit, 111 first core, 112 second core, 113 third core, 114 first plug-in portion, 115 second plug-in portion, 116 tooth portion, 117 yoke portion, 118 axial through hole, 1181 first recess, 1182 second recess, 1183 third recess, 1184 first axial through hole, 1185 second axial through hole, 119 stator slot. DETAILED DESCRIPTION

[0045] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0047] Refer to the following Figures 1 to 13 A stator core, a motor, and a household appliance provided according to some embodiments of the present invention are described.

[0048] Combine Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, in an embodiment of the present invention, a stator core 100 is proposed, comprising: a plurality of core units 110, the plurality of core units 110 are sequentially connected, and along the circumferential direction ( Figure 1 The arrow marked E in the figure points in the circumferential direction of the stator core 100. A plurality of core units 110 enclose the stator core 100. The plurality of core units 110 include a first core 111 and a second core 112. The first core 111 is provided with a first plug-in portion 114, and the second core 112 is provided with a second plug-in portion 115. The first plug-in portion 114 and the second plug-in portion 115 are plugged into each other. Each core unit 110 includes a tooth portion 116 and a yoke portion 117. The yoke portion 117 is connected to the tooth portion 116. An axial through hole 118 is formed between the yoke portions 117 of two adjacent core units 110.

[0049] The stator core 100 provided in this embodiment is formed by a plurality of core units 110, such as Figure 13 As shown, multiple core units 110 are arranged in sequence to form a long strip-shaped core structure, and the yokes 117 of two adjacent core units 110 are connected. When the strip-shaped core structure is bent, the core unit 110 at the head end and the core unit 110 at the tail end are plugged into each other, so that the core unit 110 at the head end and the core unit 110 at the tail end are not easily separated, ensuring that the multiple core units 110 are stably spliced ​​and bent into a circle to form the stator core 100. The core unit 110 at the head end is defined as the first core 111, and the core unit 110 at the tail end is defined as the second core 112. A first plug-in portion 114 is provided on the first core 111, and a second plug-in portion 115 is provided on the second core 112. The first plug-in portion 114 and the second plug-in portion 115 can be plugged into each other.

[0050] The yoke 117 is provided in the radial direction of the tooth 116 ( Figure 1 The arrow at the middle mark D points to the radial (outward) side of the stator core 100. The yokes 117 of two adjacent core units 110 are connected. When the multiple core units 110 are bent into a circle, an axial through hole 118 is formed between the two adjacent yokes 117. The axial through hole 118 is provided to facilitate the close fit of the two adjacent yokes 117.

[0051] In this embodiment, a plug-in structure and an axial through-hole 118 are provided between the first iron core 111 and the second iron core 112. Axial through-holes 118 are provided between any adjacent iron core units 110. This improves the structural symmetry of the stator iron core 100, effectively reduces the cogging torque of the permanent magnet motor, weakens torque ripple, and helps reduce the vibration and noise of the permanent magnet motor during operation. When household appliances are equipped with such permanent magnet motors, this helps improve the user experience of the household appliances. Moreover, by providing axial through-holes 118 between any adjacent iron core units 110, the motor having the stator iron core 100 has the advantages of low magnetic leakage and high manufacturing efficiency, which helps improve the efficiency of the permanent magnet motor.

[0052] Two adjacent core units 110 are defined as a group, and only one group of core units 110 has both an axial through hole 118 and a plug-in structure (a first plug-in portion 114 and a second plug-in portion 115). For example, the first plug-in portion 114 and the second plug-in portion 115 are dovetail structures. A motor having this stator core 100 has advantages such as low magnetic flux leakage and high manufacturing efficiency, and can be used in household appliances such as fans, air conditioning compressors, refrigerator compressors, and drum washing machines, as well as in industrial control and transportation fields.

[0053] Combine Figure 1 、 Figure 2 and Figure 3 As shown, in some embodiments, optionally, between the first core 111 and the second core 112 , the axial through hole 118 and the first plug-in portion 114 are distributed along the radial direction of the stator core 100 .

[0054] A first plug-in portion 114 and a second plug-in portion 115, as well as an axial through-hole 118, are provided between the first core 111 and the second core 112. The first plug-in portion 114 and the axial through-hole 118 are radially distributed, and the first plug-in portion 114 and the second plug-in portion 115 are unlikely to interfere with the axial through-hole 118. The axial through-hole 118 between the first core 111 and the second core 112 is used to improve the structural symmetry of the stator core 100, reduce the cogging torque of the permanent magnet motor, weaken torque ripple, and thus reduce vibration and noise during operation of the permanent magnet motor.

[0055] Combine Figure 1 、 Figure 2 and Figure 3 As shown, in some embodiments, optionally, between the first iron core 111 and the second iron core 112 , the axial through hole 118 is located radially outside the first plug-in portion 114 .

[0056] In order to bend adjacent core units 110, an axial through hole 118 is set between two adjacent core units 110. The axial through hole 118 is used to provide an avoidance space for the position where the two adjacent core units 110 are bent, thereby ensuring that the two adjacent core units 110 can fit tightly. The axial through hole 118 is usually set in the yoke 117 at a position close to the radial outer edge. When the first plug-in part 114 and the axial through hole 118 are distributed radially, the axial through hole 118 is set at the radial outer side of the first plug-in part 114. This makes the distance between the axial through holes 118 at different positions and the axis basically the same, thereby further improving the symmetry of the stator core 100, further reducing the cogging torque of the permanent magnet motor, weakening the torque pulsation, and helping to reduce the vibration and noise of the permanent magnet motor during operation.

[0057] Combine Figure 4 、 Figure 5 and Figure 6 As shown, in some embodiments, optionally, the first plug-in portion 114 is plugged into the second plug-in portion 115. When the first core 111 and the second core 112 are cut along the radial direction of the stator core 100, the area of ​​the second plug-in portion 115 is larger than that of the first plug-in portion 114, and an axial through hole 118 is formed between the inner wall of the second plug-in portion 115 and the first plug-in portion 114.

[0058] The first plug-in portion 114 is a plug, and the second plug-in portion 115 is a slot. When multiple core units 110 are sequentially spliced ​​together, the plug is inserted into the slot. The slot limits the plug, making it difficult for the first core 111 and the second core 112 to separate from each other, thereby ensuring the structural stability of the stator core 100. Along the radial direction of the stator core 100, the slot has a larger area and the plug has a smaller area. Therefore, a gap is left between the inner wall of the slot and the plug. This gap serves as an axial through hole 118. The axial through hole 118 between the plug and the slot is used to improve the structural symmetry of the stator core 100, reduce the cogging torque of the permanent magnet motor, weaken torque ripple, and help reduce vibration and noise during operation of the permanent magnet motor.

[0059] Combine Figure 7 、 Figure 8 、 Figure 9 and Figure 10As shown, in some embodiments, optionally, a first recess 1181 is provided on one of the two adjacent core units 110, and an axial through hole 118 is formed between the first recess 1181 and the other core unit 110; or a second recess 1182 is provided on one of the two adjacent core units 110, and a third recess 1183 is provided on the other, and an axial through hole 118 is formed between the second recess 1182 and the third recess 1183.

[0060] In two adjacent core units 110 , a first recess 1181 may be provided on one core unit 110 , and the other core unit 110 abuts against the opening of the first recess 1181 , with the space inside the first recess 1181 serving as the axial through hole 118 .

[0061] Alternatively, in two adjacent core units 110, a second recess 1182 is provided on one core unit 110, and a third recess 1183 is provided on the other core unit 110, the second recess 1182 and the third recess 1183 are connected to each other, and the space inside the second recess 1182 and the third recess 1183 serves as an axial through hole 118.

[0062] like Figure 1 As shown, in some embodiments, optionally, along the radial direction of the stator core 100 , a stator slot 119 is formed between two adjacent core units 110 . The stator slot 119 has a center line C, and the center line C passes through the axial through hole 118 .

[0063] The axial through hole 118 is arranged at the bending position of the two adjacent core units 110. The axial through hole 118 passes through the center line C of the stator slot 119, so the center line C is also close to the bending position of the two adjacent core units 110, indicating that the structure and size of the two adjacent core units 110 are basically the same. The stator core 100 is obtained by bending the above-mentioned multiple core units 110, which is beneficial to improving the performance of the motor.

[0064] Combine Figure 1 and Figure 4 As shown, in some embodiments, the plurality of stator cores 100 optionally further include a third core 113. The axial through-holes 118 include a first axial through-hole 1184 and a second axial through-hole 1185. The first axial through-hole 1184 is located between the first core 111 and the second core 112. Second axial through-holes 1185 are provided between the first core 111 and the third core 113, between the second core 112 and the third core 113, and between two adjacent third cores 113. Along the radial direction of the stator core 100, the area ratio of the first axial through-hole 1184 to the second axial through-hole 1185 is A, where A satisfies 0.1≤A≤7.

[0065] Among the multiple core units 110, except for the first core 111 and the second core 112, the other core units 110 are called the third core 113, and an axial through hole 118 is set between any two adjacent core units 110, wherein a first axial through hole 1184 is set between the first core 111 and the second core 112, a second axial through hole 1185 is set between the first core 111 and the adjacent third core 113, a second axial through hole 1185 is set between the second core 112 and the adjacent third core 113, and a second axial through hole 1185 is set between adjacent third cores 113.

[0066] like Figure 12 As shown, the closer the area ratio of the first axial through hole 1184 to the second axial through hole 1185 is, the smaller the cogging torque of the permanent magnet motor is. Therefore, when the area ratio A of the first axial through hole 1184 to the second axial through hole 1185 satisfies 0.1≤A≤7, the cogging torque of the permanent magnet motor is small, which can weaken the torque pulsation and is beneficial to reducing the vibration and noise of the permanent magnet motor during operation.

[0067] Exemplarily, the value of A is 0.1, 1 or 7.

[0068] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 11 As shown, in some embodiments, the plurality of stator cores 100 optionally further include a third core 113. The axial through-holes 118 include a first axial through-hole 1184 and a second axial through-hole 1185. The first axial through-hole 1184 is located between the first core 111 and the second core 112. Second axial through-holes 1185 are provided between the first core 111 and the third core 113, between the second core 112 and the third core 113, and between two adjacent third cores 113. The maximum length of the first axial through-hole 1184 is set to h1, and the maximum width of the first axial through-hole 1184 is set to w1. The maximum length of the second axial through-hole 1185 is set to h0, and the maximum width of the second axial through-hole 1185 is set to w0. Where h1, w1, h0, and w0 satisfy the following: 0.1 < (h1 × w1) / (h0 × w0) < 7.

[0069] Among the multiple core units 110, except for the first core 111 and the second core 112, the other core units 110 are called the third core 113, and an axial through hole 118 is set between any two adjacent core units 110, wherein a first axial through hole 1184 is set between the first core 111 and the second core 112, a second axial through hole 1185 is set between the first core 111 and the adjacent third core 113, a second axial through hole 1185 is set between the second core 112 and the adjacent third core 113, and a second axial through hole 1185 is set between adjacent third cores 113.

[0070] The dimensions of the first axial through hole 1184 and the second axial through hole 1185 in the length direction and the width direction are correlated with each other. When h1, w1, h0 and w0 satisfy 0.1<(h1×w1) / (h0×w0)<7, the cogging torque of the permanent magnet motor is small, which can weaken the torque pulsation and help reduce the vibration and noise of the permanent magnet motor during operation.

[0071] Combine Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments, optionally, along the radial direction of the stator core, the maximum length of the yoke 117 is yk, and h1 and yk satisfy 0.05×yk

[0072] When the maximum length h1 of the first axial through hole 1184 and the maximum length yk of the yoke 117 are correlated with each other, the proportional relationship between the two will affect the cogging torque of the permanent magnet motor. When 0.05×yk

[0073] Combine Figure 4 、 Figure 5 and Figure 11 As shown, in some embodiments, the plurality of stator cores 100 optionally further include a third core 113. The axial through-holes 118 include a first axial through-hole 1184 and a second axial through-hole 1185. The first axial through-hole 1184 is located between the first core 111 and the second core 112. Second axial through-holes 1185 are provided between the first core 111 and the third core 113, between the second core 112 and the third core 113, and between two adjacent third cores 113. The maximum length of the first axial through-hole 1184 is set to h2, and the maximum width of the first axial through-hole 1184 is set to w2. The maximum length of the second axial through-hole 1185 is set to h0, and the maximum width of the second axial through-hole 1185 is set to w0. Here, h2, w2, h0, and w0 satisfy the following: 0.1 < (h2 × w2) / (h0 × w0) < 7.​​

[0074] Among the multiple core units 110, except for the first core 111 and the second core 112, the other core units 110 are called the third core 113, and an axial through hole 118 is set between any two adjacent core units 110, wherein a first axial through hole 1184 is set between the first core 111 and the second core 112, a second axial through hole 1185 is set between the first core 111 and the adjacent third core 113, a second axial through hole 1185 is set between the second core 112 and the adjacent third core 113, and a second axial through hole 1185 is set between adjacent third cores 113.

[0075] The dimensions of the first axial through hole 1184 and the second axial through hole 1185 in the length direction and the width direction are correlated with each other. When h2, w2, h0 and w0 satisfy 0.1<(h2×w2) / (h0×w0)<7, the cogging torque of the permanent magnet motor is small, which can weaken the torque pulsation and help reduce the vibration and noise of the permanent magnet motor during operation.

[0076] Combine Figure 4 、 Figure 5 and Figure 11 As shown, in some embodiments, optionally, along the radial direction of the stator core, the maximum length of the yoke 117 is yk, and h2 and yk satisfy 0.05×yk<h2<0.7×yk.

[0077] When the maximum length h2 of the first axial through hole 1184 and the maximum length yk of the yoke 117 are correlated with each other, the proportional relationship between the two will affect the cogging torque of the permanent magnet motor. When 0.05×yk<h2<0.7×yk is satisfied, the cogging torque of the permanent magnet motor is small, which can weaken the torque pulsation and help reduce the vibration and noise of the permanent magnet motor during operation.

[0078] In an embodiment of the present invention, a motor is proposed, comprising: a stator core in any of the above embodiments, and can achieve the same technical effects, which will not be described in detail here.

[0079] Two adjacent core units 110 are defined as a group, and only one group of core units 110 has both an axial through hole 118 and a plug-in structure (a first plug-in portion 114 and a second plug-in portion 115). For example, the first plug-in portion 114 and the second plug-in portion 115 are dovetail structures. A motor having this stator core 100 has advantages such as low magnetic flux leakage and high manufacturing efficiency, and can be used in household appliances such as fans, air conditioning compressors, refrigerator compressors, and drum washing machines, as well as in industrial control and transportation fields.

[0080] In an embodiment of the present invention, a household appliance is proposed, comprising: a motor as in the above embodiment, and can achieve the same technical effects, which will not be described in detail here.

[0081] For example, the household appliance may be a fan, a drum washing machine, etc.

[0082] In the present invention, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; and "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0083] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0084] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A stator core, characterized in that: include: A plurality of core units, wherein the plurality of core units are sequentially connected and enclosed along the circumference of the stator core to form the stator core, wherein the plurality of core units include a first core and a second core, wherein the first core is provided with a first plug-in portion, and the second core is provided with a second plug-in portion, and the first plug-in portion and the second plug-in portion are plugged into each other; Any of the core units comprises: teeth; A yoke is connected to the tooth portion, and an axial through hole is formed between the yokes on two adjacent core units.

2. The stator core according to claim 1, characterized in that Between the first iron core and the second iron core, the axial through hole and the first plug-in portion are distributed along the radial direction of the stator iron core.

3. The stator core according to claim 1, characterized in that The axial through hole is located between the first iron core and the second iron core at a radially outer side of the first plug-in portion.

4. The stator core according to claim 1, wherein: The first plug-in portion is plugged into the second plug-in portion; The stator core is cut along a radial direction of the stator core. The area of ​​the second plug-in portion is larger than that of the first plug-in portion. The axial through hole is formed between the inner wall of the second plug-in portion and the first plug-in portion.

5. The stator core according to any one of claims 1 to 4, characterized in that: A first notch is provided on one of the two adjacent core units, and the axial through hole is formed between the first notch and the other core unit; or One of the two adjacent core units is provided with a second notch, and the other is provided with a third notch, and the axial through hole is formed between the second notch and the third notch.

6. The stator core according to any one of claims 1 to 4, characterized in that: Along the radial direction of the stator core, a stator slot is formed between two adjacent core units. The stator slot has a center line, and the center line passes through the axial through hole.

7. The stator core according to any one of claims 1 to 4, characterized in that: The plurality of stator cores further include: a third core; The axial through hole includes a first axial through hole and a second axial through hole, the first axial through hole is located between the first iron core and the second iron core, and the second axial through hole is provided between the first iron core and the third iron core, between the second iron core and the third iron core, and between two adjacent third iron cores; Along the radial direction of the stator core, an area ratio A of the first axial through hole to the second axial through hole satisfies 0.1≤A≤7.

8. The stator core according to claim 2 or 3, characterized in that: The plurality of stator cores further include: a third core; The axial through hole includes a first axial through hole and a second axial through hole, the first axial through hole is located between the first iron core and the second iron core, and the second axial through hole is provided between the first iron core and the third iron core, between the second iron core and the third iron core, and between two adjacent third iron cores; Set the maximum length of the first axial through hole to h1, the maximum width of the first axial through hole to w1, set the maximum length of the second axial through hole to h0, the maximum width of the second axial through hole to w0, wherein h1, w1, h0 and w0 satisfy 0.1<(h1×w1) / (h0×w0)<7.

9. The stator core according to claim 8, characterized in that Along the radial direction of the stator core, the maximum length of the yoke is yk, and h1 and yk satisfy 0.05×yk<h1<0.7×yk.

10. The stator core according to claim 4, characterized in that The plurality of stator cores further include: a third core; The axial through hole includes a first axial through hole and a second axial through hole, the first axial through hole is located between the first iron core and the second iron core, and the second axial through hole is provided between the first iron core and the third iron core, between the second iron core and the third iron core, and between two adjacent third iron cores; Set the maximum length of the first axial through hole to h2, the maximum width of the first axial through hole to w2, set the maximum length of the second axial through hole to h0, the maximum width of the second axial through hole to w0, wherein h2, w2, h0 and w0 satisfy 0.1<(h2×w2) / (h0×w0)<7.

11. The stator core according to claim 10, characterized in that Along the radial direction of the stator core, the maximum length of the yoke is yk, and h2 and yk satisfy 0.05×yk<h2<0.7×yk.

12. A motor, characterized in that: include: The stator core according to any one of claims 1 to 11.

13. A household appliance, characterized in that: include: The motor as claimed in claim 12.

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