Stator core, motor, compressor and electric appliance

Abstract

The application provides a kind of stator core, motor, compressor and electrical appliance, the stator core is provided with yoke part and multiple tooth parts, multiple tooth parts are arranged in the radial inner side of yoke part along the circumferential direction of stator core, the outer periphery of yoke part corresponding to tooth part is provided with flow channel extending along the axial direction of stator core, the radial center axis of flow channel is provided with reinforcing member extending along the axial direction of stator core;The first side of reinforcing member protruding from the bottom surface of flow channel is curvedly arranged, the height of the first side of reinforcing member relative to the bottom surface of flow channel is less than the groove depth of flow channel at the central axis line of the first side, and the width of reinforcing member is less than the width of flow channel.The application of the stator core can avoid the interference between reinforcing member and the inner diameter of compressor shell, improve the stiffness of stator core, reduce the deformation of stator core and reduce the iron loss.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a stator core, a motor using the stator core, a compressor using the motor, and an electrical appliance using the compressor. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) have advantages such as high power factor, large starting torque, simple structure, reliable operation, and small size, and are therefore widely used in various industries. In air conditioning compressors, the stator of the PMSM is fixed to the compressor housing using an interference fit. However, the cylindricity error between the stator core and the housing, along with differences in the cooling rate of the housing surface after the heat-fitting process, can easily cause deformation of the stator core. This deformation leads to high-order harmonics generated during motor operation due to magnetic circuit asymmetry, resulting in electromagnetic noise, increased iron losses, and reduced motor performance.

[0003] In a current type of motor, the stator core incorporates two spaced flow channels on the outer peripheral wall of a stator yoke that mates with the stator teeth. A support structure is formed between these two channels, and the support structure corresponds to the position of the stator teeth. When the stator core is assembled into the compressor housing, in addition to the portion of the stator yoke corresponding to the stator slot 180 degrees opposite the stator teeth having an interference fit with the housing, a portion of the stator yoke on the stator tooth side also has an interference fit with the housing. Therefore, this design avoids eccentricity between the stator and the compressor housing, resulting in more even stress distribution on the stator core. This solves the problem of poor coaxiality between the stator and rotor, leading to magnetic circuit asymmetry and increased vibration and noise, caused by an eccentric fit between the housing and the stator.

[0004] However, in this design, the height of the support structure is on the same plane as the outer peripheral wall of the stator yoke, which can easily cause the support structure to interfere with the inner diameter of the compressor housing. In addition, the support structure adopts a cubic structure, which results in poor stress distribution and affects the stiffness of the stator core.

[0005] Therefore, a more optimized motor structure needs to be considered. Summary of the Invention

[0006] The first objective of this invention is to provide a stator core that can avoid interference between the reinforcement and the inner diameter of the compressor housing, improve the stiffness of the stator core, reduce the deformation of the stator core, and reduce iron loss.

[0007] The second objective of this invention is to provide a motor that can avoid interference between the reinforcement and the inner diameter of the compressor housing, improve the rigidity of the stator core, reduce the deformation of the stator core, and reduce iron loss.

[0008] The third objective of this invention is to provide a compressor that can avoid interference between the reinforcement and the inner diameter of the compressor housing, improve the rigidity of the stator core, reduce the deformation of the stator core, and reduce iron loss.

[0009] The fourth objective of this invention is to provide an electrical appliance that can avoid interference between the reinforcement and the inner diameter of the compressor housing, improve the rigidity of the stator core, reduce the deformation of the stator core, and reduce iron loss.

[0010] To achieve the aforementioned first objective, the stator core provided by the present invention is provided with a yoke and multiple teeth. The multiple teeth are evenly distributed along the circumferential direction of the stator core on the radial inner side of the yoke. A flow groove extending along the axial direction of the stator core is provided on the outer periphery of the yoke corresponding to the teeth. A reinforcing member extending along the axial direction of the stator core is provided at the radial central axis of the flow groove. The first side of the reinforcing member protruding from the bottom surface of the flow groove is curved. The height of the central axis of the first side of the reinforcing member relative to the bottom surface of the flow groove is less than the groove depth of the flow groove, and the width of the reinforcing member is less than the width of the flow groove.

[0011] As can be seen from the above scheme, the stator core of the present invention, by setting a reinforcing member at the radial central axis of the bottom surface of the flow channel, wherein the height of the central axis of the reinforcing member relative to the bottom surface of the flow channel is less than the depth of the flow channel, and the width of the reinforcing member is less than the width of the flow channel, can avoid interference between the reinforcing member and the inner diameter of the compressor housing, while not affecting the flow of refrigerant oil. Moreover, the first side of the reinforcing member protruding from the bottom surface of the flow channel is curved, which can make the force on the reinforcing member more uniform, improve the endurance of the reinforcing member, thereby improving the rigidity of the stator core, reducing the deformation of the stator core, and reducing iron loss.

[0012] In a further embodiment, the height of the central axis of the first side of the reinforcement relative to the bottom surface of the flow channel satisfies the following relationship: 0 < h1 ≤ 0.3h; where h is the depth of the flow channel.

[0013] Therefore, the height of the central axis of the reinforcement relative to the bottom surface of the flow channel satisfies 0 < h1 ≤ 0.3h, which can avoid interference between the reinforcement and the inner diameter of the compressor housing.

[0014] In a further embodiment, the width of the reinforcement member and the width of the flow channel satisfy the following relationship: 0.25L1<L11<0.5L1; where L11 is the width of the reinforcement member and L1 is the width of the flow channel.

[0015] Therefore, the width of the reinforcement component satisfies 0.25L1 < L11 < 0.5L1, which can optimize the structural design of the reinforcement component and improve its durability.

[0016] In a further embodiment, the bottom surface of the flow channel is arc-shaped; the central angle of the flow channel and the central angle corresponding to the reinforcement located in the bottom area of ​​the flow channel satisfy the following relationship: 1 / 3*α<β<1 / 2*α; where α is the central angle of the flow channel and β is the central angle corresponding to the reinforcement located in the bottom area of ​​the flow channel.

[0017] Therefore, when the bottom surface of the flow channel is set as an arc, the central angle of the flow channel and the central angle corresponding to the reinforcement located in the bottom area of ​​the flow channel satisfy 1 / 3*α<β<1 / 2*α, which can optimize the structural setting of the reinforcement and improve the durability of the reinforcement.

[0018] In a further design, the first side surface is set as a quasi-normally distributed curved surface.

[0019] Therefore, it can be seen that the first side is set with a quasi-normal distribution curved surface, which can further optimize the structure of the first side and improve the stress resistance.

[0020] In a further proposed solution, the reinforcement is welded to the bottom of the flow channel.

[0021] As can be seen, the reinforcement is fixed to the bottom of the flow channel by welding, which makes it easy to modify the existing stator core.

[0022] In a further embodiment, a fixing groove is provided on the side of the flow channel near the axis of the stator core along the radial direction of the stator core, and a fixing part is provided on the reinforcing part, which is installed in the fixing groove.

[0023] It can be seen that by setting a fixing groove at the bottom of the flow channel and setting a fixing part for the reinforcement, the installation of the reinforcement can be facilitated.

[0024] In a further design, the fixing groove is an I-shaped groove; the I-shaped groove satisfies the following relationship: W / 10≤H≤W / 4, where f yk denoted as , where b is the standard value of the tensile yield strength of the reinforcement, t is the length of the I-groove, t is the width of the I-groove, and W is the thickness of the yoke.

[0025] Therefore, the fixing groove adopts an I-shaped groove, and the I-shaped groove satisfies: W / 10≤H≤W / 4 can prevent the magnetic flux density at the connection between the stator yoke and the teeth from being affected by the fixed slots in the iron core, and can also prevent stress concentration caused by the slots from affecting the stiffness of the iron core.

[0026] In a further design, the fixing part and the fixing groove are interference-fitted.

[0027] Therefore, the interference fit between the fixing part and the fixing groove facilitates the fixing of the fixing part and the fixing groove and improves the tightness of the connection between the fixing part and the fixing groove.

[0028] In a further embodiment, a plurality of reinforcing ribs are provided on the first side of the reinforcing member, the plurality of reinforcing ribs extending along the length direction of the reinforcing member, and the reinforcing ribs being arranged perpendicular to the length direction of the reinforcing member.

[0029] It can be seen that the reinforcement has multiple reinforcing ribs, which can increase the strength of the reinforcement and reduce the bending deformation of the stator core caused by interference fit.

[0030] In a further embodiment, the thickness d of the reinforcing rib satisfies the following relationship: 0.01L≤d≤0.15L; the number of reinforcing ribs satisfies the following relationship: [0.06L]≤n≤[0.1L]; where d is the thickness of the reinforcing rib, n is the number of reinforcing ribs, and L is the length of the reinforcing rib.

[0031] Therefore, by setting parameters such as the thickness and number of reinforcing ribs, the structure of the reinforced parts can be optimized while saving materials.

[0032] To achieve the second objective mentioned above, the present invention provides a motor including a stator core, wherein the stator core adopts the stator core described above.

[0033] To achieve the third objective mentioned above, the compressor provided by the present invention includes a motor, and the motor is the motor described above.

[0034] To achieve the fourth objective mentioned above, the present invention provides an electrical appliance including a compressor, wherein the compressor employs the aforementioned compressor. Attached Figure Description

[0035] Figure 1 This is a structural diagram of the first embodiment of the stator core of the present invention, viewed from the front along the axial direction of the stator core.

[0036] Figure 2 This is a structural diagram of the stator core in the first embodiment of the present invention, viewed from the front along the axial direction of the stator core.

[0037] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0038] Figure 4 This is a structural diagram of the reinforcement component in the first embodiment of the stator core of the present invention.

[0039] Figure 5 This is a structural diagram of the second embodiment of the stator core of the present invention.

[0040] Figure 6 This is a structural diagram of the second embodiment of the stator core of the present invention, viewed from the axial direction of the stator core.

[0041] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0042] Figure 8 This is a structural diagram of the reinforcement component in the second embodiment of the stator core of the present invention.

[0043] Figure 9 This is a structural diagram of the second embodiment of the stator core of the present invention, viewed from the axial direction of the stator core.

[0044] Figure 10 yes Figure 9 Enlarged view of point C in the middle.

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0046] First embodiment of stator core:

[0047] like Figure 1 As shown, in this embodiment, the stator core is provided with a yoke 1 and multiple teeth 2. The multiple teeth 2 are evenly distributed along the circumference of the stator core on the radially inner side of the yoke 1. A flow channel 3 extending axially along the stator core is provided on the outer periphery of the yoke 1 corresponding to the teeth 2. A reinforcement member 4 extending axially along the stator core is provided at the radial central axis of the flow channel 3. The first side surface 41 of the reinforcement member 4 protruding from the bottom surface of the flow channel 3 is curved. The height of the central axis of the first side surface 41 of the reinforcement member 4 relative to the bottom surface of the flow channel 3 is less than the depth of the flow channel 3, and the width of the reinforcement member 4 is less than the width of the flow channel 3. Preferably, the first side surface 41 is a quasi-normally distributed curved surface. The reinforcement member 4 is made of a material with a Rockwell hardness greater than or equal to the Rockwell hardness of the stator core.

[0048] In this embodiment, see Figure 2 and Figure 3 The height of the centerline of the first side 41 of the reinforcement 4 relative to the bottom surface of the flow channel 3 satisfies the following relationship: 0 < h1 ≤ 0.3h; where h is the depth of the flow channel 3. The fact that the height of the centerline of the first side 41 of the reinforcement 4 relative to the bottom surface of the flow channel 3 satisfies 0 < h1 ≤ 0.3h can prevent interference between the reinforcement 4 and the inner diameter of the compressor housing.

[0049] In this embodiment, the bottom surface of the flow channel 3 is arc-shaped. The central angle of the flow channel 3 and the central angle corresponding to the reinforcement 4 located in the bottom area of ​​the flow channel 3 satisfy the following relationship: 1 / 3*α < β < 1 / 2*α; where α is the central angle of the flow channel 3 and β is the central angle corresponding to the reinforcement 4 located in the bottom area of ​​the flow channel 3. When the bottom surface of the flow channel 3 is arc-shaped, the central angle of the flow channel 3 and the central angle corresponding to the reinforcement 4 located in the bottom area of ​​the flow channel 3 satisfy 1 / 3*α < β < 1 / 2*α, that is, the central angle corresponding to the reinforcement 4 located in the bottom area of ​​the flow channel 3 is within the range of one-third to one-half of the central angle of the flow channel 3, which can optimize the structural setting of the reinforcement 4 and improve the durability of the reinforcement 4.

[0050] In this embodiment, a fixing groove 5 is provided on the side of the flow groove 3 near the axis of the stator core along the radial direction of the stator core. See [reference needed]. Figure 4 The reinforcement 4 is provided with a fixing part 42, which is installed in the fixing groove 5. By providing a fixing groove 5 at the bottom of the flow channel 3 and a fixing part 42 in the reinforcement 4, the installation of the reinforcement 4 can be facilitated. The fixing groove 5 can be a T-shaped groove, an I-shaped groove, or a groove whose width gradually increases from the bottom of the flow channel 3 towards the axis of the stator core.

[0051] In this embodiment, the fixing groove 5 is an I-shaped groove. The I-shaped groove satisfies the following relationship: W / 10≤H≤W / 4, where f yk Where b is the standard value of the tensile yield strength of the reinforcement 4, t is the length of the I-shaped groove, and W is the thickness of the yoke 1. The fixing groove 5 is an I-shaped groove, and the I-shaped groove meets the above dimensions. This prevents the core from being affected by the opening of the fixing groove 5, thus avoiding impact on the magnetic flux density at the connection between the stator yoke 1 and the tooth 2, and also prevents stress concentration caused by the groove from affecting the core stiffness. In this embodiment, the fixing part 42 and the fixing groove 5 are interference-fitted, which facilitates the fixed installation of the fixing part 42 and the fixing groove 5, and improves the tightness of the connection between the fixing part 42 and the fixing groove 5.

[0052] Depend on Figure 4It is known that multiple reinforcing ribs 43 are provided on the first side 41 of the reinforcement member 4. These reinforcing ribs 43 extend along the length direction of the reinforcement member 4 and are perpendicular to the length direction of the reinforcement member 4. The multiple reinforcing ribs 43 increase the strength of the reinforcement member 4 and reduce the bending deformation of the stator core caused by interference fit. The thickness d of the reinforcing rib 43 satisfies the following relationship: 0.01L≤d≤0.15L; the number of reinforcing ribs 43 satisfies the following relationship: [0.06L]≤n≤[0.1L]; where d is the thickness of the reinforcing rib 43, n is the number of reinforcing ribs 43, L is the length of the reinforcing rib 43, and [*] indicates rounding. For example, when L is 60 mm, [0.06L] equals 3. By setting the parameters of the thickness and number of reinforcing ribs 43, the structure of the reinforcement member 4 can be optimized, while saving materials.

[0053] As described above, the stator core of the present invention, by providing a reinforcing member 4 at the radial central axis of the bottom surface of the flow channel 3, wherein the height of the central axis of the reinforcing member 4 relative to the bottom surface of the flow channel 3 is less than the depth of the flow channel 3, and the width of the reinforcing member 4 is less than the width of the flow channel 3, can avoid interference between the reinforcing member 4 and the inner diameter of the compressor housing, while not affecting the flow of refrigerant oil. Furthermore, the first side 41 of the reinforcing member 4 protruding from the bottom surface of the flow channel 3 is curved, which allows for more uniform stress distribution on the reinforcing member 4, improving its resilience, thereby increasing the rigidity of the stator core, reducing stator core deformation, and lowering iron loss.

[0054] Second embodiment of stator core:

[0055] like Figure 5 , Figure 6 and Figure 7 In this embodiment, the stator core is provided with a yoke 10 and a plurality of teeth 20. The plurality of teeth 20 are evenly distributed along the circumferential direction of the stator core on the radial inner side of the yoke 10. A flow groove 30 extending along the axial direction of the stator core is provided on the outer periphery of the yoke 10 corresponding to the teeth 20. A reinforcement member 40 extending along the axial direction of the stator core is provided at the radial central axis of the flow groove 30. The first side surface 401 of the reinforcement member 40 protruding from the bottom surface of the flow groove 30 is curved. The height of the first side surface 401 of the reinforcement member 40 relative to the bottom surface of the flow groove 30 is less than the groove depth of the flow groove 30, and the width of the reinforcement member 40 is less than the width of the flow groove 30. Preferably, the first side surface 401 is a quasi-normally distributed curved surface.

[0056] In this embodiment, the height of the central axis of the first side 401 of the reinforcement 40 relative to the bottom surface of the flow channel 30 satisfies the following relationship: 0 < h1 ≤ 0.3h; where h is the depth of the flow channel 30. The fact that the height of the central axis of the first side 401 of the reinforcement 40 relative to the bottom surface of the flow channel 30 satisfies 0 < h1 ≤ 0.3h avoids interference between the reinforcement 40 and the inner diameter of the compressor housing.

[0057] In this embodiment, the bottom surface of the flow channel 30 is arc-shaped. The central angle of the flow channel 30 and the central angle corresponding to the reinforcement 40 located in the bottom area of ​​the flow channel 30 satisfy the following relationship: 1 / 3*α < β < 1 / 2*α; where α is the central angle of the flow channel 30, and β is the central angle corresponding to the reinforcement 40 located in the bottom area of ​​the flow channel 30. When the bottom surface of the flow channel 30 is arc-shaped, the central angle of the flow channel 30 and the central angle corresponding to the reinforcement 40 located in the bottom area of ​​the flow channel 30 satisfy 1 / 3*α < β < 1 / 2*α, which can optimize the structural design of the reinforcement 40 and improve its durability.

[0058] Multiple reinforcing ribs 403 are provided on the first side 401 of the reinforcement member 40. These ribs extend along the length of the reinforcement member 40 and are perpendicular to its length. The presence of multiple reinforcing ribs 403 increases the strength of the reinforcement member 40 and reduces bending deformation of the stator core due to interference fit. The thickness d of the reinforcing rib 403 satisfies the following relationship: 0.01L ≤ d ≤ 0.15L; the number of reinforcing ribs 403 satisfies the following relationship: [0.06L] ≤ n ≤ [0.1L]; where d is the thickness of the reinforcing rib 403, n is the number of reinforcing ribs 403, and L is the length of the reinforcing rib 403. By setting the parameters of the thickness and number of reinforcing ribs 403, the structure of the reinforcement member 40 can be optimized, while saving material.

[0059] Furthermore, in this embodiment, the reinforcement 40 is welded to the bottom of the flow channel 30. The reinforcement 40 is fixed to the bottom of the flow channel 30 by welding, which facilitates the modification of existing stator cores. The bottom surface 402 of the reinforcement 40 is arc-shaped, and the bottom surface 402 of the reinforcement 40 and the bottom surface of the flow channel 30 are concentric arc surfaces.

[0060] Third embodiment of stator core:

[0061] like Figure 9 and Figure 10As shown, in this embodiment, the stator core is provided with a yoke 100 and a plurality of teeth 200. The plurality of teeth 200 are evenly distributed along the circumferential direction of the stator core on the radially inner side of the yoke 100. A flow channel 300 extending axially along the stator core is provided on the outer periphery of the yoke 100 corresponding to the teeth 200. A reinforcement 400 extending axially along the stator core is provided at the radial central axis of the flow channel 300. The first side surface 4001 of the reinforcement 400 protruding from the bottom surface of the flow channel 300 is curved. The height of the central axis of the first side surface 4001 of the reinforcement 400 relative to the bottom surface of the flow channel 300 is less than the depth of the flow channel 300, and the width of the reinforcement 400 is less than the width of the flow channel 300. Preferably, the first side surface 4001 is a quasi-normally distributed curved surface.

[0062] In this embodiment, the bottom surface of the flow channel 300 is planar. The height of the central axis of the first side surface 4001 of the reinforcement 400 relative to the bottom surface of the flow channel 300 satisfies the following relationship: 0 < h1 ≤ 0.3h; where h is the depth of the flow channel 300. The fact that the height of the central axis of the first side surface 4001 of the reinforcement 400 relative to the bottom surface of the flow channel 300 satisfies 0 < h1 ≤ 0.3h avoids interference between the reinforcement 400 and the inner diameter of the compressor housing.

[0063] In this embodiment, the width of the reinforcement 400 and the width of the flow channel 300 satisfy the following relationship: 0.25L1 < L11 < 0.5L1; where L11 is the width of the reinforcement 400 and L1 is the width of the flow channel 300. The width of the reinforcement 400 satisfying the above relationship optimizes its structural design and improves its durability. The reinforcement 400 is welded to the bottom of the flow channel 300. Fixing the reinforcement 400 to the bottom of the flow channel 300 by welding facilitates the modification of existing stator cores.

[0064] Of course, the reinforcement 400 can also be provided with reinforcing ribs as in the first embodiment or the second embodiment. The specific dimensions of the reinforcing ribs are as described in the first embodiment or the second embodiment, and will not be repeated here.

[0065] Motor Example:

[0066] In this embodiment, the motor includes a stator core, which is the stator core described in the above embodiment.

[0067] Compressor Example:

[0068] In this embodiment, the compressor includes a motor, which is the same motor used in the above embodiment.

[0069] Electrical Example:

[0070] In this embodiment, the electrical appliance includes a compressor, which is the compressor described in the above embodiment. The electrical appliance can be a refrigerator, air conditioner, air purifier, or other appliance that requires a compressor.

[0071] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. A stator core comprising a yoke and a plurality of teeth, wherein the plurality of teeth are evenly distributed radially inner to the yoke along the circumferential direction of the stator core, and a flow groove extending axially along the stator core is provided on the outer periphery of the yoke corresponding to the teeth, the flow groove being for the flow of refrigerant oil, and a reinforcing member extending axially along the stator core is provided at the radial central axis of the flow groove; characterized in that: The first side of the reinforcement protruding from the bottom surface of the flow channel is curved. The height of the central axis of the first side of the reinforcement relative to the bottom surface of the flow channel is less than the depth of the flow channel. The width of the reinforcement is less than the width of the flow channel to avoid interference between the reinforcement and the inner diameter of the compressor housing, while not affecting the flow of refrigeration oil. Wherein, the height h1 of the central axis of the first side of the reinforcement relative to the bottom surface of the flow channel satisfies the following relationship: 0 < h1 ≤ 0.3h; where h is the depth of the flow channel; The width of the reinforcement member and the width of the flow channel satisfy the following relationship: 0.25L1 < L11 < 0.5L1; where L11 is the width of the reinforcement member and L1 is the width of the flow channel.

2. The stator core according to claim 1, characterized in that: The bottom surface of the flow channel is arc-shaped; The central angle of the flow channel and the central angle corresponding to the bottom area of ​​the reinforcement in the flow channel satisfy the following relationship: 1 / 3 α＜β＜1 / 2 α； Wherein, α is the central angle of the flow channel, and β is the central angle corresponding to the bottom area of ​​the reinforcement component in the flow channel.

3. The stator core according to claim 1, characterized in that: The first side surface is set as a quasi-normally distributed curved surface.

4. The stator core according to claim 1, characterized in that: The reinforcement component is welded to the bottom of the flow channel.

5. The stator core according to claim 1, characterized in that: Along the radial direction of the stator core, a fixing groove is provided on the side of the flow channel near the axis of the stator core, and the reinforcing member is provided with a fixing part, which is installed in the fixing groove.

6. The stator core according to claim 5, characterized in that: The fixing groove is an I-shaped groove; The I-shaped groove satisfies the following relationship: 9 < <13 ,W / 10≤H≤W / 4, Among them, f yk denoted as , b is the standard value of the tensile yield strength of the reinforcement, t is the length of the I-groove, t is the width of the I-groove, W is the thickness of the yoke, and H is the minimum distance from the bottom of the I-groove to the bottom surface of the flow channel.

7. The stator core according to claim 5, characterized in that: The fixing part is interference-fitted with the fixing groove.

8. The stator core according to any one of claims 1 to 7, characterized in that: The first side of the reinforcement member is provided with a plurality of reinforcing ribs, which extend along the length direction of the reinforcement member and are arranged perpendicular to the length direction of the reinforcement member.

9. The stator core according to claim 8, characterized in that: The thickness of the reinforcing rib satisfies the following relationship: 0.01L≤d≤0.15L; The number of reinforcing ribs satisfies the following relationship: [0.06L]≤n≤[0.1L]; Where d is the thickness of the reinforcing rib, n is the number of the reinforcing ribs, and L is the length of the reinforcing ribs.

10. An electric motor, comprising a stator core, characterized in that: The stator core is the stator core described in any one of claims 1 to 9.

11. A compressor, comprising a motor, characterized in that: The motor is the motor described in claim 10.

12. An electrical appliance, comprising a compressor, characterized in that: The compressor is the compressor described in claim 11.

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