Stator lamination, stator core, electric machine, compressor and refrigeration device

Abstract

The application provides a stator lamination, a stator core, a motor, a compressor and a refrigeration device, wherein the stator lamination comprises: a stator yoke part in a ring structure; a plurality of stator tooth parts, each of which is arranged on an inner ring of the stator yoke part and is arranged along the circumferential direction of the stator yoke part; and any one of the plurality of stator tooth parts comprises: a tooth body, one end of which is connected to the inner ring of the stator yoke part; and a tooth shoe, which is connected to the other end of the tooth body and comprises at least three tooth surfaces on the side end face of the tooth shoe away from the tooth body along the circumferential direction of the stator yoke part, and a recess is formed at the connection of any two adjacent tooth surfaces, and the recess is a groove structure formed by recessing the end of the tooth shoe away from the tooth body towards the tooth body. The application can realize the magnetic concentration effect of the center of the stator tooth part, make the magnetic density space distribution closer to the sine wave, reduce the magnetic saturation of the tooth shoe of the stator tooth part, improve the asynchronous additional torque, and improve the efficiency and output capacity of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically, to a stator lamination, a stator core, a motor, a compressor, and a refrigeration device. Background Technology

[0002] In related technologies, single-phase induction motors with concentrated windings inherently have a variety of complex harmonic components, which often result in significant asynchronous additional torque (asynchronous valley), greatly affecting the efficiency and output capacity of the motor. Summary of the Invention

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

[0004] Therefore, a first aspect of the present invention provides a stator lamination.

[0005] A second aspect of the present invention provides a stator core.

[0006] A third aspect of the present invention provides an electric motor.

[0007] A fourth aspect of the present invention provides a compressor.

[0008] The fifth aspect of the present invention provides a refrigeration device.

[0009] In view of this, one aspect of the present invention provides a stator lamination, comprising: a stator yoke, the stator yoke having an annular structure; a plurality of stator teeth, the plurality of stator teeth being disposed in the inner ring of the stator yoke and arranged at intervals along the circumference of the stator yoke; any one of the plurality of stator teeth includes: a tooth body, one end of the tooth body being connected to the inner ring of the stator yoke; a tooth shoe, connected to the other end of the tooth body, the tooth shoe having at least three tooth surfaces on the side facing away from the tooth body along the circumference of the stator yoke, and a recess being formed at the connection of any two adjacent tooth surfaces, the recess being a groove structure formed by the tooth shoe recessing towards the tooth body at the side facing away from the tooth body.

[0010] The present invention provides a stator lamination comprising a stator yoke and a plurality of stator teeth. Each stator tooth comprises a tooth body and a tooth shoe, and the stator tooth is connected to the stator yoke via the tooth body. The structure of the stator teeth is rationally configured such that the end face of the tooth shoe facing away from the tooth body includes at least three tooth surfaces, and a recess is formed at the junction of any two adjacent tooth surfaces. This recess is a groove structure, formed by the tooth shoe's end facing away from the tooth body being recessed towards the tooth body.

[0011] Specifically, there are three tooth surfaces, and a concave portion is formed at the connection between any two adjacent tooth surfaces. Due to the concave portion, the magnetic permeability changes, and the air gap magnetic flux density is superimposed with a reverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke, the local saturation effect at both ends of the stator tooth shoe can achieve the magnetic concentration effect at the center of the stator tooth, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the stator tooth shoe is reduced, the asynchronous additional torque is improved, and the efficiency and output capacity of the motor are enhanced.

[0012] Specifically, the number of tooth surfaces can be three, five, etc., which will not be listed here.

[0013] The stator laminations of the present invention may also have the following additional technical features:

[0014] In the above technical solution, further, along the circumferential direction of the stator yoke, the two ends of the toothed shoe are the first end and the second end, respectively; the tooth surface between the first end and the recess adjacent to the first end is the first tooth surface; wherein, from the second end to the first end, the distance from the first tooth surface to the center of the inscribed circle of the stator tooth gradually increases.

[0015] In this technical solution, by reasonably setting the structure of the stator teeth, the two opposite ends of the tooth shoe along the circumference of the stator yoke are respectively called the first end and the second end. The tooth surface between the first end and the concave part adjacent to the first end is called the first tooth surface. Along the direction from the second end to the first end, the distance from the first tooth surface to the center of the inscribed circle of the stator teeth gradually increases. The increase in air gap will increase the magnetic circuit voltage drop on the air gap side. Therefore, this setting reduces the magnetic saturation of the stator tooth shoe.

[0016] Specifically, the stator core includes stator laminations, and the motor includes the stator core and a rotor. The rotor is rotatably disposed inside the stator core and rotates from the second end to the first end. Since the distance from the first tooth surface to the center of the inscribed circle of the stator teeth gradually increases along the direction from the second end to the first end, the air gap at the first tooth surface increases when the rotor rotates. This increased air gap increases the magnetic circuit voltage drop on the air gap side, significantly reducing magnetic saturation at the first tooth surface, thereby reducing the local magnetic saturation effect, weakening the distortion of the air gap magnetic field, and reducing the harmonic content of the electrodes, which is beneficial for improving motor efficiency and output capability.

[0017] The direction from the second end to the first end is counterclockwise.

[0018] In any of the above technical solutions, the tooth surface between the second end and the recess adjacent to the second end is called the second tooth surface; wherein, from the first end to the second end, the distance from the second tooth surface to the center of the inscribed circle of the stator tooth gradually increases.

[0019] In this technical solution, the stator tooth structure is rationally designed so that the distance from the second tooth surface to the center of the inscribed circle of the stator tooth gradually increases along the direction from the first end to the second end. As the rotor rotates along the direction from the second end to the first end, the air gap at the second tooth surface gradually decreases with the rotor's rotation, i.e., magnetic saturation gradually increases. This avoids the increase in radial force caused by abrupt changes in the air gap, thereby ensuring sufficient output power and reducing motor noise.

[0020] Specifically, from the second end to the first end, the distance from the first tooth surface to the center of the inscribed circle of the stator teeth gradually increases; from the first end to the second end, the distance from the second tooth surface to the center of the inscribed circle of the stator teeth gradually increases. As the rotor rotates from the second end to the first end, the air gap at the second tooth surface gradually decreases with the rotation of the rotor, that is, the magnetic saturation gradually increases, avoiding the increase in radial force caused by a cliff-like change in air gap; when the rotor rotates, the air gap at the first tooth surface increases, which increases the magnetic circuit pressure drop on the air gap side, greatly reducing the magnetic saturation at the first tooth surface, thereby reducing the local magnetic saturation effect, making the magnetic flux density spatial distribution closer to a sine wave, reducing the magnetic saturation of the stator teeth, improving the asynchronous additional torque, and improving the efficiency and output capability of the motor.

[0021] Conversely, as the rotor rotates from the first end to the second end, the air gap at the first tooth surface gradually decreases with the rotation of the rotor, that is, the magnetic saturation gradually increases, avoiding the increase in radial force caused by the abrupt change in air gap. When the rotor rotates, the air gap at the second tooth surface increases. The increase in air gap will increase the magnetic circuit voltage drop on the air gap side, which will greatly reduce the magnetic saturation at the second tooth surface, making the magnetic flux density spatial distribution closer to a sine wave. The magnetic saturation of the stator teeth is reduced, improving the asynchronous additional torque and improving the efficiency and output capability of the motor.

[0022] In any of the above technical solutions, the stator yoke further includes multiple stator units, which are connected end to end to form a ring structure, and each of the multiple stator units is connected to a stator tooth.

[0023] In this technical solution, by rationally setting the structure of the stator yoke, the stator yoke includes multiple stator units, which are arranged in a ring around the periphery to form a ring structure. Each stator unit is equipped with a stator tooth, and the stator unit is connected to the stator tooth. This arrangement achieves uniformity and consistency in the distribution of the stator lamination structure.

[0024] In any of the above technical solutions, further, a cross-section is taken of the stator lamination in a direction perpendicular to the axis of the stator yoke. On this cross-section, along the circumference of the stator yoke, the central angle corresponding to the outline of the stator unit is a1, and the central angle corresponding to the outline of the toothed shoe is a2; wherein... p is the number of stator units; a2 = k × a1, 0.5 < k < 1.

[0025] In this technical solution, by rationally setting the mating structure between the stator yoke and the stator teeth, a cross-section is formed on the stator lamination in a direction perpendicular to the axis of the stator yoke. On this cross-section, the central angle corresponding to the circumferential contour line of the stator unit on the stator yoke is a1, and the central angle corresponding to the circumferential contour line of the toothed shoe on the stator yoke is a2. Furthermore, a1 and a2 satisfy a2 = k × a1. 0.5 < k < 1. This setting limits the relationship between the central angle of the stator tooth shoe and the central angle of the stator unit, thereby limiting the range of air gap variation to ensure the motor's output power while reducing magnetic saturation.

[0026] In any of the above technical solutions, further, when the number of tooth surfaces is three, the tooth surface between the first tooth surface and the second tooth surface is the third tooth surface; a cross-section is taken of the stator lamination in a direction perpendicular to the axis of the stator yoke, and on the cross-section, the extension of the contour line of the first tooth surface intersects the extension of the contour line of the third tooth surface at point A, and the extension of the contour line of the third tooth surface intersects the extension of the contour line of the second tooth surface at point B; on the cross-section, the central angle corresponding to the line connecting the first end and point A is b1; the central angle corresponding to the line connecting point A and point B is b2; the central angle corresponding to the line connecting point B and the second end is b3; where b1 = b3, and

[0027] In this technical solution, by setting the structure of the stator teeth, a cross-section is formed on the stator lamination in a direction perpendicular to the axis of the stator yoke. On this cross-section, the intersection point of the extension of the contour line of the first tooth surface and the extension of the contour line of the third tooth surface is denoted as A; the intersection point of the extension of the contour line of the third tooth surface and the extension of the contour line of the second tooth surface is denoted as B; the central angle corresponding to the line connecting the first end and point A is denoted as b1; the central angle corresponding to the line connecting point A and point B is denoted as b2; and the central angle corresponding to the line connecting point B and the second end is denoted as b3. Wherein, b1, b2, and b3 satisfy: b1 = b3, and... In other words, along the circumference of the stator yoke, while ensuring the consistency of the total magnetic flux at the first and second ends of the stator tooth shoe, the central angle corresponding to the line connecting the first end to point A is equal to the central angle corresponding to the line connecting point B to the second end. The closer point A, the intersection of the extension of the first tooth surface profile and the extension of the third tooth surface profile, is to the center of the tooth shoe, the less obvious the magnetic saturation, and therefore, no trimming is required. When point A is reached, the magnetic saturation phenomenon gradually intensifies, at which point trimming can be gradually performed. To achieve better results, the following conditions must be met: This setting reduces the air gap to increase the impact on the motor's output power.

[0028] In any of the above technical solutions, further, along the radial direction of the stator yoke, the width of the end of the toothed shoe is d1, and the distance from point B to the second end is d2; wherein,

[0029] In this technical solution, by reasonably setting the structure of the stator teeth, the width of the end of the tooth shoe along the radial direction of the stator yoke is denoted as d1, and the distance from point B to the second end is denoted as d2, where d1 and d2 satisfy... This setting limits the reduction in magnetic saturation to a reasonable range, preventing excessive air gap and thus limiting the motor's output power to an optimal range. Furthermore, by appropriately limiting the relationship between d1 and d2, the effects of increasing the air gap can be compensated for, thereby improving the motor's output power.

[0030] Specifically, the stator lamination is cross-sectioned in a direction perpendicular to the axis of the stator yoke. In the cross-section, the toothed shoe has a first side and a second side. The first side and the second side are two opposite sides of the toothed shoe. The second side is closer to point B than the first side. The length of the second side is d1.

[0031] In any of the above technical solutions, further, along the circumferential direction of the stator yoke, the first tooth surface includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0032] In this technical solution, the structure of the first tooth surface can be set according to actual needs. For example, along the circumference of the stator yoke, the first tooth surface can be a plane, a curved surface, or a folded surface. Alternatively, along the circumference of the stator yoke, the first tooth surface can be a combination of some or all of the plane, curved surface, and folded surface.

[0033] In any of the above technical solutions, further, along the circumferential direction of the stator yoke, the second tooth surface includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0034] In this technical solution, the structure of the second tooth surface can be configured according to actual needs. For example, along the circumference of the stator yoke, the second tooth surface can be a plane, a curved surface, or a folded surface. Alternatively, along the circumference of the stator yoke, the second tooth surface can be a combination of some or all of the plane, curved surface, and folded surface.

[0035] In any of the above technical solutions, further, along the circumferential direction of the stator yoke, the third tooth surface includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0036] In this technical solution, the structure of the third tooth surface can be configured according to actual needs. For example, along the circumference of the stator yoke, the third tooth surface can be a plane, a curved surface, or a folded surface. Alternatively, along the circumference of the stator yoke, the third tooth surface can be a combination of some or all of the plane, curved surface, and folded surface.

[0037] In any of the above technical solutions, the recess is further cross-sectioned in a direction perpendicular to the axis of the stator yoke, and the cross-sectional shape of the recess includes any of the following: square, triangular, semi-circular and trapezoidal.

[0038] In this technical solution, the structure of the recess can be set in a targeted manner according to the specific actual situation. For example, the recess can be cross-sectioned in a direction perpendicular to the axis of the stator yoke. The cross-sectional shape of the recess includes square, triangular, semi-circular or trapezoidal.

[0039] A second aspect of the present invention provides a stator core comprising: a stator lamination of any of the technical solutions in the first aspect.

[0040] The stator core provided by the present invention includes stator laminations as described in any of the technical solutions in the first aspect, and therefore has all the beneficial effects of the aforementioned stator laminations, which will not be described in detail here.

[0041] A third aspect of the present invention provides an electric motor comprising: a stator core as described in the second aspect; and a rotor rotatably disposed within the stator core.

[0042] The motor provided by the present invention includes a stator core as described in the second aspect, and therefore has all the beneficial effects of the aforementioned stator core, which will not be described in detail here.

[0043] Specifically, the motor is an asynchronous motor.

[0044] A fourth aspect of the present invention provides a compressor comprising: the stator core of the second aspect; or the motor of the third aspect.

[0045] The compressor provided by the present invention, because it includes a stator core as described in the second aspect, or a motor as described in the third aspect, has all the beneficial effects of the aforementioned stator core or motor, which will not be described in detail here.

[0046] A fifth aspect of the present invention provides a refrigeration device, comprising: a stator core as described in the second aspect; or a motor as described in the third aspect; or a compressor as described in the fourth aspect.

[0047] The refrigeration equipment provided by the present invention includes a stator core as described in the second aspect, or a motor as described in the third aspect, or a compressor as described in the fourth aspect. Therefore, it has all the beneficial effects of the stator core, motor, or compressor mentioned above, which will not be described one by one here.

[0048] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0050] Figure 1 A schematic diagram of the stator laminations and rotor of the first embodiment of the present invention is shown;

[0051] Figure 2 A partial structural schematic diagram of the stator laminations and rotor of the first embodiment of the present invention is shown;

[0052] Figure 3 A schematic diagram showing the dimensions of a stator lamination according to a first embodiment of the present invention is shown;

[0053] Figure 4 A schematic diagram of the stator teeth according to a second embodiment of the present invention is shown;

[0054] Figure 5 A diagram showing the relationship between the electrical angle and magnetic flux density distribution of a motor according to an embodiment of the present invention and a motor in the related art is illustrated.

[0055] Figure 6 A graph showing the relationship between the speed and torque of a motor according to an embodiment of the present invention and a motor in related technologies is shown.

[0056] Figure 7 A graph showing the relationship between the equivalent amplitude of magnetic flux density and harmonic order of a motor according to an embodiment of the present invention and a motor in the related art is presented.

[0057] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0058] 100 Stator lamination, 110 Stator yoke, 112 Stator unit, 120 Stator tooth, 122 Tooth body, 124 Tooth shoe, 126 Recess, 128 First end, 130 Second end, 132 First tooth surface, 134 Second tooth surface, 136 Third tooth surface, 138 First side, 140 Second side, 200 Rotor. Detailed Implementation

[0059] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0060] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0061] The following reference Figures 1 to 7 The present invention describes a stator lamination 100, a stator core, a motor, a compressor, and a refrigeration device according to some embodiments thereof.

[0062] Example 1:

[0063] like Figure 1 , Figure 2 and Figure 4 As shown, an embodiment of the first aspect of the present invention provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120, wherein the stator yoke 110 has an annular structure, and the plurality of stator teeth 120 are all disposed in the inner ring of the stator yoke 110, and the plurality of stator teeth 120 are arranged at intervals along the circumference of the stator yoke 110; any one of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124, one end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122. Along the circumference of the stator yoke 110, the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection of any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 from the end facing away from the tooth body 122.

[0064] In detail, the stator lamination 100 includes a stator yoke 110 and a plurality of stator teeth 120. Each stator tooth 120 includes a tooth body 122 and a tooth shoe 124. The stator tooth 120 is connected to the stator yoke 110 through the tooth body 122. The structure of the stator tooth 120 is reasonably arranged such that the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. The recess 126 is a groove structure, which is formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 at the end facing away from the tooth body 122.

[0065] Specifically, there are three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. Due to the setting of the recess 126, the magnetic permeability will change, and the air gap magnetic flux density will be superimposed with a reverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke 110, the local saturation effect at both ends of the tooth shoe 124 of the stator tooth 120 can achieve the magnetic focusing effect at the center of the stator tooth 120, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the tooth shoe 124 of the stator tooth 120 is reduced, the asynchronous additional torque is improved, and the efficiency and output capability of the motor are enhanced.

[0066] Specifically, the number of tooth surfaces is three, five, etc. When the number of tooth surfaces is three, the number of recesses 126 is two; when the number of tooth surfaces is five, the number of recesses 126 is four. These are not listed here.

[0067] Example 2:

[0068] like Figure 2 and Figure 4 As shown, based on Embodiment 1, Embodiment 2 provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120. The stator yoke 110 has an annular structure, and the plurality of stator teeth 120 are all disposed in the inner ring of the stator yoke 110, and the plurality of stator teeth 120 are arranged at intervals along the circumference of the stator yoke 110. Each of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124. One end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122. Along the circumference of the stator yoke 110, the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces. A recess 126 is formed at the connection of any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 from the end facing away from the tooth body 122.

[0069] Furthermore, along the circumferential direction of the stator yoke 110, the two ends of the toothed shoe 124 are the first end 128 and the second end 130, respectively; the tooth surface between the first end 128 and the recess 126 adjacent to the first end 128 is the first tooth surface 132, and from the second end 130 to the first end 128, the distance from the first tooth surface 132 to the center of the inscribed circle of the stator tooth 120 gradually increases.

[0070] In detail, by reasonably setting the structure of the stator tooth 120, the two opposite ends of the tooth shoe 124 along the circumference of the stator yoke 110 are respectively referred to as the first end 128 and the second end 130. The tooth surface between the first end 128 and the recess 126 adjacent to the first end 128 is referred to as the first tooth surface 132. Along the direction from the second end 130 to the first end 128, the distance from the first tooth surface 132 to the center of the inscribed circle of the stator tooth 120 gradually increases. The increase in air gap will increase the magnetic circuit voltage drop on the air gap side. Therefore, this setting reduces the magnetic saturation of the stator tooth shoe 124.

[0071] In this embodiment, the stator core includes stator laminations 100, and the motor includes a stator core and a rotor 200. The rotor 200 is rotatably disposed inside the stator core and rotates along the direction from the second end 130 to the first end 128. Since the distance from the center of the inscribed circle of the stator tooth 120 to the first tooth surface 132 gradually increases along the direction from the second end 130 to the first end 128, the air gap at the first tooth surface 132 increases when the rotor 200 rotates. This increased air gap increases the magnetic circuit voltage drop on the air gap side, significantly reducing magnetic saturation at the first tooth surface 132, thereby reducing the local magnetic saturation effect, weakening the distortion of the air gap magnetic field, and reducing the harmonic content of the electrodes, which is beneficial for improving motor efficiency and output capability.

[0072] The direction from the second end 130 to the first end 128 is counterclockwise, such as... Figure 1 As shown, the arrow indicates the direction of rotation of rotor 200.

[0073] In some other embodiments, the rotor 200 is rotatably disposed inside the stator core, and the rotor 200 rotates along the direction from the first end 128 to the second end 130. Since the distance between the first tooth surface 132 and the center of the inscribed circle of the stator tooth portion 120 gradually decreases along the direction from the first end 128 to the second end 130, the air gap at the first tooth surface 132 decreases when the rotor 200 rotates, that is, the magnetic saturation gradually increases, avoiding the increase in radial force caused by the cliff-like change in air gap, thereby ensuring that the motor has sufficient output power and reducing the noise of the motor.

[0074] The direction from the first end 128 to the second end 130 is clockwise.

[0075] Example 3:

[0076] like Figure 2 and Figure 4 As shown, based on Embodiment 1 or Embodiment 2, Embodiment 3 provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120. The stator yoke 110 has an annular structure, and the plurality of stator teeth 120 are all disposed in the inner ring of the stator yoke 110, and the plurality of stator teeth 120 are arranged at intervals along the circumference of the stator yoke 110. Each of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124. One end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122. Along the circumference of the stator yoke 110, the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces. A recess 126 is formed at the connection of any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 from the end facing away from the tooth body 122.

[0077] Furthermore, the tooth surface between the second end 130 and the recess 126 adjacent to the second end 130 is the second tooth surface 134; wherein, from the first end 128 to the second end 130, the distance from the second tooth surface 134 to the center of the inscribed circle of the stator tooth portion 120 gradually increases.

[0078] In detail, the structure of the stator teeth 120 is rationally designed so that the distance from the second tooth surface 134 to the center of the inscribed circle of the stator teeth 120 gradually increases along the direction from the first end 128 to the second end 130. When the rotor 200 rotates along the direction from the second end 130 to the first end 128, the air gap at the second tooth surface 134 gradually decreases as the rotor 200 rotates, i.e., magnetic saturation gradually increases. This avoids the increase in radial force caused by abrupt changes in the air gap, thereby ensuring sufficient output power of the motor and reducing motor noise.

[0079] Specifically, from the second end 130 to the first end 128, the distance from the first tooth surface 132 to the center of the inscribed circle of the stator tooth portion 120 gradually increases; from the first end 128 to the second end 130, the distance from the second tooth surface 134 to the center of the inscribed circle of the stator tooth portion 120 gradually increases. As the rotor 200 rotates along the direction from the second end 130 to the first end 128, the air gap at the second tooth surface 134 gradually decreases with the rotation of the rotor 200, i.e., the magnetic saturation gradually increases, avoiding the increase in radial force caused by abrupt changes in the air gap. When the rotor 200 rotates, the air gap at the first tooth surface 132 increases. This increase in air gap increases the magnetic circuit voltage drop on the air gap side, significantly reducing the magnetic saturation at the first tooth surface 132, thereby reducing the local magnetic saturation effect. This makes the magnetic flux density spatial distribution closer to a sine wave, reducing the magnetic saturation of the stator tooth shoe 124, improving the asynchronous additional torque, and enhancing the motor's efficiency and output capability.

[0080] Conversely, when the rotor 200 rotates along the direction from the first end 128 to the second end 130, the air gap at the first tooth surface 132 gradually decreases as the rotor 200 rotates, that is, the magnetic saturation gradually increases, avoiding the increase in radial force caused by the cliff-like change in air gap. When the rotor 200 rotates, the air gap at the second tooth surface 134 increases. The increase in air gap will increase the magnetic circuit voltage drop on the air gap side, greatly reducing the magnetic saturation at the second tooth surface 134, making the magnetic flux density spatial distribution closer to a sine wave. The magnetic saturation of the stator tooth shoe 124 is reduced, improving the asynchronous additional torque and improving the efficiency and output capability of the motor.

[0081] Example 4:

[0082] like Figure 1 , Figure 2 and Figure 3As shown, based on any of the above embodiments, Embodiment 4 provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120. The stator yoke 110 has an annular structure, and the plurality of stator teeth 120 are all disposed in the inner ring of the stator yoke 110, and the plurality of stator teeth 120 are arranged at intervals along the circumference of the stator yoke 110. Each of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124. One end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122. Along the circumference of the stator yoke 110, the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces. A recess 126 is formed at the connection of any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 from the end facing away from the tooth body 122.

[0083] Furthermore, the stator yoke 110 includes a plurality of stator units 112, which are connected end to end to form a ring structure, and each of the plurality of stator units 112 is connected to a stator tooth 120.

[0084] In detail, by rationally arranging the structure of the stator yoke 110, the stator yoke 110 includes multiple stator units 112, which are arranged in a ring shape. Each stator unit 112 is equipped with a stator tooth 120, and the stator unit 112 is connected to the stator tooth 120. This arrangement achieves uniformity and consistency in the structural distribution of the stator laminations 100.

[0085] Furthermore, such as Figure 3 As shown, a cross-section of the stator lamination 100 is taken perpendicular to the axis of the stator yoke 110. In this cross-section, along the circumferential direction of the stator yoke 110, the central angle corresponding to the outline of the stator unit 112 is a1, and the central angle corresponding to the outline of the toothed shoe 124 is a2; wherein, p is the number of stator unit 112; a2 = k × a1, 0.5 < k < 1.

[0086] Specifically, by rationally configuring the mating structure between the stator yoke 110 and the stator tooth 120, a cross-section is formed of the stator lamination 100 perpendicular to the axis of the stator yoke 110. On this cross-section, the central angle corresponding to the contour line of the stator unit 112 in the circumferential direction of the stator yoke 110 is a1, and the central angle corresponding to the contour line of the toothed shoe 124 in the circumferential direction of the stator yoke 110 is a2. Furthermore, a1 and a2 satisfy a2 = k × a1. 0.5 < k < 1. This setting limits the relationship between the central angle corresponding to the tooth shoe 124 of the stator tooth section 120 and the central angle corresponding to the stator unit 112, thereby limiting the range of the air gap variation, so as to ensure the output power of the motor while reducing magnetic saturation.

[0087] Specifically, the value of k can be any of the following: 0.6, 0.7, 0.8, 0.89, etc., which will not be listed here.

[0088] In this embodiment, p is 8.

[0089] Example 5:

[0090] like Figure 2 and Figure 4 As shown, based on any of the embodiments in Embodiments 2 to 4, Embodiment 5 provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120. The stator yoke 110 has an annular structure, and the plurality of stator teeth 120 are all disposed within the inner ring of the stator yoke 110, and are spaced apart along the circumference of the stator yoke 110. Each of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124. One end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122, along the circumference of the stator yoke 110. The toothed shoe 124 has at least three tooth surfaces on the side facing away from the tooth body 122. A recess 126 is formed at the connection between any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the toothed shoe 124 being recessed in the direction of the tooth body 122 at the end facing away from the tooth body 122. Along the circumference of the stator yoke 110, the two ends of the toothed shoe 124 are the first end 128 and the second end 130, respectively. The tooth surface between the first end 128 and the recess 126 adjacent to the first end 128 is the first tooth surface 132. From the second end 130 to the first end 128, the distance from the first tooth surface 132 to the center of the inscribed circle of the stator tooth 120 gradually increases.

[0091] Furthermore, such as Figure 3 As shown, when there are three tooth surfaces, the tooth surface between the first tooth surface 132 and the second tooth surface 134 is the third tooth surface 136. A cross-section is taken of the stator lamination 100 perpendicular to the axis of the stator yoke 110. In this cross-section, the extension of the contour line of the first tooth surface 132 intersects the extension of the contour line of the third tooth surface 136 at point A, and the extension of the contour line of the third tooth surface 136 intersects the extension of the contour line of the second tooth surface 134 at point B. In this cross-section, the central angle corresponding to the line connecting the first end 128 and point A is b1; the central angle corresponding to the line connecting point A and point B is b2; and the central angle corresponding to the line connecting point B and the second end 130 is b3. Where b1 = b3, and...

[0092] The stator tooth section 120 is structured such that a cross-section is taken of the stator lamination 100 perpendicular to the axis of the stator yoke section 110. On this cross-section, the intersection of the extension of the contour line of the first tooth surface 132 and the extension of the contour line of the third tooth surface 136 is denoted as A; the intersection of the extension of the contour line of the third tooth surface 136 and the extension of the contour line of the second tooth surface 134 is denoted as B; the central angle corresponding to the line connecting the first end 128 and point A is denoted as b1; the central angle corresponding to the line connecting point A and point B is denoted as b2; and the central angle corresponding to the line connecting point B and the second end 130 is denoted as b3. Wherein, b1, b2, and b3 satisfy: b1 = b3, and... In other words, along the circumference of the stator yoke 110, while ensuring the consistency of the total magnetic flux at the first end 128 and the second end 130 of the tooth shoe 124 of the stator tooth section 120, the central angle corresponding to the line connecting the first end 128 and point A is equal to the central angle corresponding to the line connecting point B and the second end 130. The closer point A, the intersection of the extension of the contour line of the first tooth surface 132 and the extension of the contour line of the third tooth surface 136, is to the center of the tooth shoe 124, the less obvious the magnetic saturation, and therefore no arc trimming is required. When point A is reached, the magnetic saturation phenomenon gradually strengthens, at which point arc trimming can be gradually performed. To achieve better results, the following conditions must be met: This setting reduces the air gap to increase the impact on the motor's output power.

[0093] Furthermore, such as Figure 3 As shown, along the radial direction of the stator yoke 110, the width of the end of the toothed shoe 124 is d1, and the distance from point B to the second end 130 is d2; wherein,

[0094] Specifically, by rationally configuring the structure of the stator tooth 120, the width of the end of the toothed shoe 124 along the radial direction of the stator yoke 110 is denoted as d1, and the distance from point B to the second end 130 is denoted as d2. Here, d1 and d2 satisfy... This setting limits the reduction in magnetic saturation to a reasonable range, preventing excessive air gap and thus limiting the motor's output power to an optimal range. Furthermore, by appropriately limiting the relationship between d1 and d2, the effects of increasing the air gap can be compensated for, thereby improving the motor's output power.

[0095] Specifically, such as Figure 3 As shown, a cross-section of the stator lamination 100 is taken in a direction perpendicular to the axis of the stator yoke 110. In the cross-section, the toothed shoe 124 has a first side 138 and a second side 140. The first side 138 and the second side 140 are two opposite sides of the toothed shoe 124. The second side 140 is closer to point B than the first side 138. The length of the second side 140 is d1.

[0096] Example 6:

[0097] like Figure 2 and Figure 4 As shown, based on Embodiment 5, Embodiment 6 provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120. The stator yoke 110 has a ring-shaped structure, and the plurality of stator teeth 120 are all disposed within the inner ring of the stator yoke 110, and are spaced apart circumferentially along the stator yoke 110. Each of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124. One end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122. Along the circumferential direction of the stator yoke 110, the tooth shoe 124 has at least three teeth on its side facing away from the tooth body 122. On the surface, a recess 126 is formed at the connection between any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 away from the tooth shoe 124. Along the circumference of the stator yoke 110, the two ends of the tooth shoe 124 are the first end 128 and the second end 130, respectively. The tooth surface between the first end 128 and the recess 126 adjacent to the first end 128 is the first tooth surface 132. From the second end 130 to the first end 128, the distance from the first tooth surface 132 to the center of the inscribed circle of the stator tooth 120 gradually increases. When the number of tooth surfaces is three, the tooth surface between the first tooth surface 132 and the second tooth surface 134 is the third tooth surface 136.

[0098] Furthermore, along the circumferential direction of the stator yoke 110, the first tooth surface 132 includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0099] In detail, the structure of the first tooth surface 132 can be set according to actual needs. For example, along the circumference of the stator yoke 110, the first tooth surface 132 can be a plane, a curved surface, or a folded surface. Alternatively, along the circumference of the stator yoke 110, the first tooth surface 132 can be a combination of some or all of the plane, curved surface, and folded surface.

[0100] In this embodiment, the first tooth surface 132 is an arc surface.

[0101] Furthermore, along the circumferential direction of the stator yoke 110, the second tooth surface 134 includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0102] The structure of the second tooth surface 134 can be configured according to actual needs. For example, along the circumference of the stator yoke 110, the second tooth surface 134 can be a plane, a curved surface, or a folded surface. Alternatively, along the circumference of the stator yoke 110, the second tooth surface 134 can be a combination of some or all of the plane, curved surface, and folded surface.

[0103] In this embodiment, the second tooth surface 134 is an arc surface.

[0104] Furthermore, along the circumferential direction of the stator yoke 110, the third tooth surface 136 includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

[0105] The structure of the third tooth surface 136 can be configured according to actual needs. For example, along the circumference of the stator yoke 110, the third tooth surface 136 can be a plane, a curved surface, or a folded surface. Alternatively, along the circumference of the stator yoke 110, the third tooth surface 136 can be a combination of some or all of the plane, curved surface, and folded surface.

[0106] In this embodiment, the third tooth surface 136 is an arc surface.

[0107] Example 7:

[0108] Based on any of the above embodiments, Embodiment 7 provides a stator lamination 100 including a stator yoke 110 and a plurality of stator teeth 120, wherein the stator yoke 110 has an annular structure, and the plurality of stator teeth 120 are all disposed in the inner ring of the stator yoke 110, and the plurality of stator teeth 120 are arranged at intervals along the circumference of the stator yoke 110; any one of the plurality of stator teeth 120 includes a tooth body 122 and a tooth shoe 124, one end of the tooth body 122 is connected to the inner ring of the stator yoke 110, and the tooth shoe 124 is connected to the other end of the tooth body 122. Along the circumference of the stator yoke 110, the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection of any two adjacent tooth surfaces. The recess 126 is a groove structure formed by the tooth shoe 124 being recessed in the direction of the tooth body 122 at the end facing away from the tooth body 122.

[0109] Furthermore, the recess 126 is cross-sectioned in a direction perpendicular to the axis of the stator yoke 110, and the cross-sectional shape of the recess 126 includes any of the following: square, triangular, semi-circular and trapezoidal.

[0110] In detail, the structure of the recess 126 can be designed specifically according to the actual situation. For example, the recess 126 can be cross-sectioned in a direction perpendicular to the axis of the stator yoke 110. The cross-sectional shape of the recess 126 includes square, triangular, semi-circular or trapezoidal.

[0111] Example 8:

[0112] An embodiment of the second aspect of the present invention provides a stator core comprising: a stator lamination 100 of any embodiment of the first aspect.

[0113] In detail, the stator core includes stator laminations 100, which include a stator yoke 110 and a plurality of stator teeth 120. Each stator tooth 120 includes a tooth body 122 and a tooth shoe 124, and the stator tooth 120 is connected to the stator yoke 110 through the tooth body 122. The structure of the stator tooth 120 is reasonably arranged such that the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. The recess 126 is a groove structure, which is formed by the tooth shoe 124 being recessed towards the tooth body 122 at the end facing away from the tooth body 122.

[0114] Specifically, there are three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. Due to the setting of the recess 126, the magnetic permeability will change, and the air gap magnetic flux density will be superimposed with a reverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke 110, the local saturation effect at both ends of the tooth shoe 124 of the stator tooth 120 can achieve the magnetic focusing effect at the center of the stator tooth 120, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the tooth shoe 124 of the stator tooth 120 is reduced, the asynchronous additional torque is improved, and the efficiency and output capability of the motor are enhanced.

[0115] Example 9:

[0116] like Figure 1 As shown, an embodiment of the third aspect of the present invention provides an electric motor, comprising: a stator core according to the second aspect embodiment; and a rotor 200 rotatably disposed within the stator core.

[0117] In detail, the motor includes a stator core, which includes stator laminations 100. Each stator lamination 100 includes a stator yoke 110 and a plurality of stator teeth 120. Each stator tooth 120 includes a tooth body 122 and a tooth shoe 124. The stator tooth 120 is connected to the stator yoke 110 via the tooth body 122. The structure of the stator teeth 120 is rationally configured such that the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection point of any two adjacent tooth surfaces. This recess 126 is a groove structure, formed by the tooth shoe 124 being recessed towards the tooth body 122 at the end facing away from it.

[0118] Specifically, there are three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. Due to the setting of the recess 126, the magnetic permeability will change, and the air gap magnetic flux density will be superimposed with a reverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke 110, the local saturation effect at both ends of the tooth shoe 124 of the stator tooth 120 can achieve the magnetic focusing effect at the center of the stator tooth 120, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the tooth shoe 124 of the stator tooth 120 is reduced, the asynchronous additional torque is improved, and the efficiency and output capability of the motor are enhanced.

[0119] Specifically, the motor is an asynchronous motor.

[0120] Example 10:

[0121] A fourth aspect of the present invention provides a compressor comprising: a stator core according to a second aspect; or a motor according to a third aspect.

[0122] In detail, the compressor includes a stator core or a motor. The motor includes a stator core, and the stator core includes stator laminations 100. The stator laminations 100 include a stator yoke 110 and a plurality of stator teeth 120. Each stator tooth 120 includes a tooth body 122 and a tooth shoe 124. The stator tooth 120 is connected to the stator yoke 110 through the tooth body 122. The structure of the stator teeth 120 is reasonably arranged such that the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. The recess 126 is a groove structure, which is formed by the tooth shoe 124 being recessed towards the tooth body 122 at the end facing away from the tooth body 122.

[0123] Specifically, there are three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. Due to the setting of the recess 126, the magnetic permeability will change, and the air gap magnetic flux density will be superimposed with a reverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke 110, the local saturation effect at both ends of the tooth shoe 124 of the stator tooth 120 can achieve the magnetic focusing effect at the center of the stator tooth 120, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the tooth shoe 124 of the stator tooth 120 is reduced, the asynchronous additional torque is improved, and the efficiency and output capability of the motor are enhanced.

[0124] Example 11:

[0125] A fifth aspect of the present invention provides a refrigeration device, comprising: a stator core according to a second aspect; a motor according to a third aspect; or a compressor according to a fourth aspect.

[0126] In detail, the refrigeration equipment includes a stator core, or a motor, or a compressor. The motor includes a stator core, which includes stator laminations 100. Each stator lamination 100 includes a stator yoke 110 and multiple stator teeth 120. Each stator tooth 120 includes a tooth body 122 and a tooth shoe 124, and the stator tooth 120 is connected to the stator yoke 110 via the tooth body 122. The structure of the stator teeth 120 is rationally configured such that the end face of the tooth shoe 124 facing away from the tooth body 122 includes at least three tooth surfaces, and a recess 126 is formed at the connection point of any two adjacent tooth surfaces. This recess 126 is a groove structure, formed by the tooth shoe 124 being recessed towards the tooth body 122 at the end facing away from it.

[0127] Specifically, there are three tooth surfaces, and a recess 126 is formed at the connection between any two adjacent tooth surfaces. Due to the setting of the recess 126, the magnetic permeability will change, and the air gap magnetic flux density will be superimposed with a reverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke 110, the local saturation effect at both ends of the tooth shoe 124 of the stator tooth 120 can achieve the magnetic focusing effect at the center of the stator tooth 120, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the tooth shoe 124 of the stator tooth 120 is reduced, the asynchronous additional torque is improved, and the efficiency and output capability of the motor are enhanced.

[0128] Example 12:

[0129] The motor includes a stator core and a rotor 200. The stator core includes stator laminations 100, which include toothed shoes 124, tooth bodies 122, and stator yokes 110. The toothed shoes 124, adjacent to the rotor 200, sequentially include a first tooth surface 132, a recess 126, a third tooth surface 136, a recess 126, and a second tooth surface 134 in a clockwise direction. From the second end 130 to the first end 128, the distance from the first tooth surface 132 to the center of the inscribed circle of the stator tooth portion 120 gradually increases; from the first end 128 to the second end 130, the distance from the second tooth surface 134 to the center of the inscribed circle of the stator tooth portion 120 gradually increases. After the concave portion 126 is added, due to the change in magnetic permeability, the air gap magnetic flux density will be superimposed with an inverse third-order spatial harmonic component. At the same time, along the circumference of the stator yoke portion 110, the local saturation effect at both ends of the tooth shoe 124 of the stator tooth portion 120 can achieve the magnetic focusing effect at the center of the stator tooth portion 120, making the spatial distribution of magnetic flux density closer to a sine wave. The magnetic saturation of the tooth shoe 124 of the stator tooth portion 120 is reduced, improving the asynchronous additional torque and enhancing the efficiency and output capability of the motor.

[0130] Along the circumference of the stator yoke 110, to ensure the consistency of the total magnetic flux at the first end 128 and the second end 130 of the tooth shoe 124 of the stator tooth section 120, the central angle corresponding to the line connecting the first end 128 and point A is equal to the central angle corresponding to the line connecting point B and the second end 130. The closer point A, the intersection of the extension of the contour line of the first tooth surface 132 and the extension of the contour line of the third tooth surface 136, is to the center of the tooth shoe 124, the less obvious the magnetic saturation, and therefore no arc trimming is required. When point A is reached, the magnetic saturation phenomenon gradually intensifies, at which point arc trimming can be gradually performed. To achieve better results, the following conditions must be met: This setting reduces the air gap to increase the impact on the motor's output power. Specifically, b2 = b1.

[0131] like Figure 5 The diagram shows a comparison of the magnetic flux density distribution of the asynchronous motor of this application and that of asynchronous motors in related technologies. Compared with related technologies, the magnetic flux density spatial distribution of this application is closer to a sine wave, the magnetic saturation of the stator tooth 120's tooth shoe 124 is reduced, the asynchronous additional torque is improved, and the efficiency and output capacity of the motor are enhanced.

[0132] like Figure 6 The figure shows a comparison of the output torque of the asynchronous motor of this application and that of asynchronous motors in related technologies. The asynchronous additional torque trough (at 400 rpm) of this application is significantly improved compared with related technologies, the motor performance is better in the low speed range, and the performance does not decrease in the high speed range.

[0133] like Figure 7 As shown in the figure, the asynchronous motor of this application and the asynchronous motor in related technologies have different orders of magnetic flux density amplitude. The air gap magnetic field of this application changes smoothly. Compared with related technologies, the higher harmonic magnetic field decreases significantly, and the fundamental frequency content also increases slightly. The unit of equivalent magnetic flux density amplitude is Tesla (T).

[0134] Therefore, the motor of this application can improve asynchronous additional torque and increase the output capacity of the motor.

[0135] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0136] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples.

[0137] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stator lamination, characterized in that, include: The stator yoke has a ring-shaped structure. Multiple stator teeth are provided on the inner ring of the stator yoke, and the multiple stator teeth are arranged at intervals along the circumference of the stator yoke. Any one of the plurality of stator teeth includes: The tooth body, one end of which is connected to the inner ring of the stator yoke; The toothed shoe is connected to the other end of the tooth body. Along the circumference of the stator yoke, the toothed shoe has at least three tooth surfaces on one end face away from the tooth body. A recess is formed at the connection of any two adjacent tooth surfaces. The recess is a groove structure formed by the toothed shoe recessing towards the tooth body at the end away from the tooth body. Along the circumferential direction of the stator yoke, the two ends of the toothed shoe are a first end and a second end, respectively; The tooth surface between the first end and the recess adjacent to the first end is the first tooth surface; The tooth surface between the second end and the recess adjacent to the second end is the second tooth surface; When the number of tooth surfaces is three, the tooth surface between the first tooth surface and the second tooth surface is the third tooth surface; The extension of the contour line of the third tooth surface intersects the extension of the contour line of the second tooth surface at point B. Along the radial direction of the stator yoke, the width of the end of the toothed shoe is d1, and the distance from point B to the second end is d2; in, The toothed shoe has a first side and a second side, the second side being closer to point B than the first side, and the length of the second side being d1.

2. The stator lamination according to claim 1, characterized in that, From the second end toward the first end, the distance from the first tooth surface to the center of the inscribed circle of the stator tooth gradually increases.

3. The stator lamination according to claim 2, characterized in that, From the first end to the second end, the distance from the second tooth surface to the center of the inscribed circle of the stator tooth gradually increases.

4. The stator lamination according to any one of claims 1 to 3, characterized in that, The stator yoke includes multiple stator units, which are connected end to end to form the annular structure. Each of the multiple stator units is connected to a stator tooth.

5. The stator lamination according to claim 4, characterized in that, A cross-section is taken of the stator lamination in a direction perpendicular to the axis of the stator yoke. On the cross-section, along the circumference of the stator yoke, the central angle corresponding to the outline of the stator unit is a1, and the central angle corresponding to the outline of the toothed shoe is a2. in, p is the number of stator units; a2 = k × a1, 0.5 < k < 1.

6. The stator lamination according to claim 2 or 3, characterized in that, A cross-section is taken of the stator lamination in a direction perpendicular to the axis of the stator yoke. On the cross-section, the extension of the contour line of the first tooth surface intersects the extension of the contour line of the third tooth surface at point A. In cross-section, the central angle corresponding to the line connecting the first end and point A is b1; the central angle corresponding to the line connecting point A and point B is b2; and the central angle corresponding to the line connecting point B and the second end is b3. Where b1 = b3, and 7. The stator lamination according to claim 6, characterized in that, Along the circumferential direction of the stator yoke, the first tooth surface includes any one or a combination of the following: a plane, a curved surface, and a folded surface; and / or Along the circumferential direction of the stator yoke, the second tooth surface includes any one or a combination of the following: a plane, a curved surface, and a folded surface; and / or Along the circumferential direction of the stator yoke, the third tooth surface includes any one or a combination of the following: a plane, a curved surface, and a folded surface.

8. The stator lamination according to any one of claims 1 to 3, characterized in that, The recess is cross-sectioned in a direction perpendicular to the axis of the stator yoke, and the cross-sectional shape of the recess includes any of the following: square, triangular, semi-circular, and trapezoidal.

9. A stator core, characterized in that, include: At least one stator lamination as described in any one of claims 1 to 8.

10. An electric motor, characterized in that, include: The stator core as described in claim 9; The rotor is rotatably disposed within the stator core.

11. The motor according to claim 10, characterized in that, The motor is an asynchronous motor.

12. A compressor, characterized in that, include: The stator core as described in claim 9; or The motor as described in claim 10 or 11.

13. A refrigeration device, characterized in that, include: The stator core as described in claim 9; or The motor as described in claim 10 or 11; or The compressor as described in claim 12.

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