Stator assembly, compressor and refrigeration device

Abstract

The utility model discloses a kind of stator assembly, compressor and refrigeration equipment, it is related to motor technical field.Stator assembly includes the stator core formed by the stacking of multiple amorphous alloy sheets, stator core includes yoke part, tooth part and boot part, by setting stator core is formed by the stacking of multiple amorphous alloy sheets, the iron loss of stator assembly can be reduced.For motor, the area of stator slot is expected as large as possible, to increase winding wire diameter to reduce copper loss, the minimum width of tooth part is expected as small as possible, but the smaller the width of tooth part, the more likely to cause magnetic field saturation.The minimum tooth width W of tooth part is designed reasonably, to reduce the problem of magnetic pressure drop increase caused by magnetic field saturation, the size of current can be reduced, and the working efficiency of motor is improved. t It is arranged in the range of 2πD / 9Q to 2πD / 3Q, which can effectively improve the size of the stator slot area, and also can improve the problem of magnetic pressure drop increase caused by magnetic field saturation, can reduce the size of current, improve the working efficiency of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a stator assembly, a motor and a compressor. Background Technology

[0002] Iron losses occur in the stator assembly of a compressor during operation. Iron losses refer to the energy loss generated by the motor core under the action of an alternating magnetic field, mainly including hysteresis loss and eddy current loss. Increased iron losses lead to higher motor temperature, reducing the motor's lifespan and efficiency. To reduce iron losses, the silicon steel sheets used to construct the stator core can be replaced with thinner amorphous alloy sheets. However, the saturation magnetic flux density of amorphous alloy sheets is significantly lower than that of silicon steel sheets. If the dimensions of the amorphous motor are designed according to the traditional silicon steel motor approach, it is easy to cause the motor's magnetic field to saturate, resulting in an increased magnetic voltage drop in the amorphous magnetic circuit. This significantly reduces the effective main magnetic flux of the amorphous motor, leading to excessive winding current and ultimately reducing efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a stator assembly, in which the stator core is made of amorphous material, and the working efficiency of the motor is improved by rationally designing the width of the teeth on the stator core.

[0004] This utility model also proposes a compressor and refrigeration equipment having the above-mentioned stator assembly.

[0005] According to a first aspect of the present invention, a stator assembly includes a stator core composed of a plurality of axially stacked amorphous alloy sheets. The stator core includes a yoke, teeth, and a shoe. The yoke is annular, and the teeth are provided in a plurality of positions. Along the circumference of the yoke, the teeth are spaced apart, with one end connected to the inner side of the yoke. The other ends of the teeth are respectively connected to the shoe. Stator slots are formed between adjacent teeth, shoe, and yoke. The minimum tooth width of the teeth along the circumference of the stator assembly is W. t The number of stator slots is Q, and on the axial projection plane perpendicular to the stator assembly, the diameter of the largest inscribed circle of the plurality of shoe portions is D, satisfying: .

[0006] The stator assembly according to the embodiments of the present invention has at least the following beneficial effects:

[0007] By designing the stator core to consist of multiple stacked amorphous alloy sheets, iron losses in the stator assembly can be effectively reduced, thereby lowering the motor's temperature rise. For motors, the stator slot area should be designed to be as large as possible to increase the winding wire diameter and reduce copper losses; that is, the minimum tooth width should be as small as possible. However, a smaller tooth width makes it easier for the magnetic field to saturate, and using amorphous materials in the stator assembly also makes the magnetic field more prone to saturation. To rationally design the minimum tooth width and reduce the increase in magnetic voltage drop caused by magnetic field saturation, the minimum tooth width W is... t Setting the value within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of ​​the stator slots, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the motor's operating efficiency.

[0008] According to some embodiments of the present invention, the minimum width of the yoke along the radial direction of the stator assembly is W. y ,satisfy: .

[0009] According to some embodiments of this utility model, the number Q of stator slots is 6, and the minimum tooth width W of the teeth is... t Satisfies: 7mm≤W t ≤20.9mm, the minimum width W of the yoke y Satisfies: 3.5mm≤W y ≤10.5mm.

[0010] According to some embodiments of this utility model, the number Q of stator slots is 12, and the minimum tooth width W of the teeth is... t Satisfies: 3.5mm≤W t ≤10.5mm, the minimum width W of the yoke y Satisfies: 1.7mm≤W y ≤5.2mm.

[0011] According to some embodiments of the present invention, the tooth width of the tooth portion remains constant along the radial direction of the stator assembly.

[0012] According to some embodiments of the present invention, the yoke is provided with a plurality of mounting holes, which are spaced apart circumferentially along the stator assembly.

[0013] According to some embodiments of the present invention, the yoke includes a plurality of corner portions arranged at intervals along the circumference of the stator assembly, and a plurality of mounting holes are provided one-to-one with the corner portions.

[0014] According to some embodiments of the present invention, the side of the boot portion away from the teeth is constructed as an arc-shaped surface.

[0015] The motor according to a second aspect of the present invention includes the stator assembly described in the above embodiments.

[0016] The compressor according to the embodiments of the present invention has at least the following beneficial effects:

[0017] By employing the stator assembly of the first aspect embodiment, the stator assembly, through the arrangement of the stator core being composed of multiple stacked amorphous alloy sheets, can effectively reduce the iron loss of the stator assembly, thereby reducing the temperature rise of the motor. For the motor, the area of ​​the stator slots should be designed to be as large as possible to increase the winding wire diameter and thus reduce copper loss; that is, the minimum tooth width should be as small as possible. However, a smaller tooth width makes it easier for the magnetic field to saturate, and the use of amorphous materials in the stator assembly also makes the magnetic field more prone to saturation. To rationally design the minimum tooth width to reduce the problem of increased magnetic voltage drop caused by magnetic field saturation, the minimum tooth width W is... t Setting the value within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of ​​the stator slots, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the motor's operating efficiency.

[0018] The refrigeration equipment according to a third aspect of the present invention includes the compressor described in the above embodiments.

[0019] The refrigeration device according to the embodiments of this utility model has at least the following beneficial effects:

[0020] By employing the compressor of the second aspect embodiment, the stator assembly of the compressor, through the arrangement of the stator core being composed of multiple stacked amorphous alloy sheets, can effectively reduce the iron loss of the stator assembly, thereby reducing the temperature rise of the motor. For the motor, the area of ​​the stator slots should be designed to be as large as possible to increase the winding wire diameter and thus reduce copper loss; that is, the minimum tooth width should be as small as possible. However, a smaller tooth width makes it easier for the magnetic field to saturate, and the use of amorphous materials in the stator assembly also makes the magnetic field more prone to saturation. To rationally design the minimum tooth width to reduce the problem of increased magnetic voltage drop caused by magnetic field saturation, the minimum tooth width W is... t Setting the value within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of ​​the stator slots, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the motor's operating efficiency.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a stator assembly according to an embodiment of the present invention;

[0024] Figure 2 This is a top view of a stator assembly according to an embodiment of the present invention;

[0025] Figure 3 This is a top view of a stator assembly according to another embodiment of the present invention;

[0026] Figure 4 This is a graph showing the relationship between the magnetic field strength and magnetic flux density of a stator assembly according to an embodiment of this utility model.

[0027] Figure 5 This is a graph showing the relationship between the magnetic flux density and the unit iron loss ratio of a stator assembly according to an embodiment of this utility model.

[0028] Figure label:

[0029] Stator assembly 100; stator core 110; yoke 111; tooth 112; shoe 113; mounting hole 114; corner 115; stator slot 116; arc surface 117; amorphous alloy sheet 120. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] In related technologies, the stator core of compressors is typically made of laminated silicon steel sheets. However, silicon steel sheets exhibit significant hysteresis and eddy current losses during high-frequency motor operation, resulting in high iron losses. Amorphous alloy materials, on the other hand, have thinner profiles and superior permeability, effectively reducing iron losses. However, compared to silicon steel sheets, amorphous alloy sheets have lower saturation magnetic flux density.

[0035] For example, refer to Figure 4 As shown, Figure 4 The horizontal axis represents the magnetic field strength, and the vertical axis represents the ratio of the current magnetic flux density B to the saturation magnetic flux density Bn of the stator core. When the ratio of the current magnetic flux density to the saturation magnetic flux density is 1, it means that the current magnetic flux density has reached the saturation magnetic flux density. Figure 4 The dashed line with squares represents the magnetic flux density ratio of a 0.3mm thick silicon steel sheet as a function of magnetic field strength, while the solid line with dots represents the magnetic flux density ratio of an amorphous alloy sheet as a function of magnetic field strength. As can be seen from the graph, both curves show an upward trend as the magnetic field strength increases, meaning the current magnetic flux density gradually approaches saturation. Furthermore, it is clearly shown that, under the same magnetic field strength, the amorphous alloy sheet reaches saturation faster than the silicon steel sheet. If the traditional silicon steel motor design is used, the amorphous alloy magnetic circuit is prone to local magnetic saturation, leading to increased magnetic voltage drop, increased winding current, and ultimately reduced motor efficiency.

[0036] To solve the above problems, refer to Figure 1 and Figure 2 As shown, a stator assembly 100 according to an embodiment of the present invention can be used as a motor for a compressor. The stator assembly 100 of this embodiment includes a stator core 110 and windings. The stator core 110 is composed of multiple amorphous alloy sheets 120 stacked along the axial direction of the stator assembly 100. The stator core 110 includes a yoke 111, teeth 112, and shoe portions 113. The yoke 111 is annular, and multiple teeth 112 are provided. Along the circumferential direction of the yoke 111, multiple teeth 112 are spaced apart, with one end connected to the inner side of the yoke 111, and the other end of each tooth 112 is connected to a shoe portion 113. A stator slot 116 is formed between adjacent teeth 112, shoe portions 113, and yoke 111. The windings pass through the stator slots 116 and are wound around the teeth 112. The minimum tooth width of the teeth 112 along the circumferential direction of the stator assembly 100 is W. t The number of stator slots 116 is Q. On the axial projection plane perpendicular to the stator assembly 100, the diameter of the largest inscribed circle of the plurality of shoe portions 113 is D, satisfying: .

[0037] In amorphous alloys, the atomic arrangement is disordered, and grain boundaries are virtually nonexistent, which significantly reduces eddy current losses. Eddy current losses are one of the main sources of iron losses, especially in high-frequency motors, where they increase sharply with increasing frequency. Because amorphous alloys lack grain boundaries, eddy current losses are greatly reduced, thus improving motor efficiency. The thickness of the amorphous alloy sheet 120 is less than or equal to 0.1 mm, for example, the thickness range can be from 0.02 mm to 0.05 mm. The tooth 112 refers to the protruding structure extending inward from the yoke 111, used to guide magnetic flux and support the winding. The shoe 113 refers to the extended portion at the end of the tooth 112, which prevents the winding wound around the tooth 112 from detaching from it. The stator slot 116 refers to the space enclosed by adjacent teeth 112, yoke 111, and shoe 113, used to accommodate the winding.

[0038] First, let's analyze the minimum tooth width W of the tooth portion 112 in this invention. t Source of the range formula:

[0039] Reference Figure 5 As shown, Figure 5 The horizontal axis represents the ratio of the current magnetic flux density to the saturation magnetic flux density of the stator core 110. The closer the ratio of the current magnetic flux density to the saturation magnetic flux density is to 1, the closer the current magnetic flux density is to the saturation magnetic flux density. The vertical axis represents the ratio of the unit iron loss of the amorphous alloy sheet 120 and the silicon steel sheet. The smaller the ratio of the unit iron loss of the amorphous alloy sheet 120 to the silicon steel sheet, the lower the iron loss of the amorphous alloy sheet 120. Figure 5 The multiple curves in the graph represent the relationship between the ratio of current magnetic flux density to saturation magnetic flux density and the unit iron loss ratio at different electrical frequencies. Figure 5 As can be seen from the data, for the four electrical frequencies, the corresponding curves all show a rapid decrease followed by a gradual stabilization. Therefore, as the ratio of the current magnetic flux density to the saturation magnetic flux density increases, the ratio of iron loss per unit gradually decreases. In other words, the closer the current magnetic flux density is to the saturation magnetic flux density, the lower the iron loss of the stator core 110.

[0040] Therefore, to ensure that the stator core 110 made of amorphous alloy sheet 120 has sufficiently low iron loss, the magnetic flux density B of the stator core 110 should satisfy: 0.2Bn ≤ B ≤ Bn. The magnetic flux density B of the stator core 110 includes the magnetic flux density Bt of the tooth portion 112 and the magnetic flux density By of the yoke portion 111, where Bn is the saturation magnetic flux density of the amorphous alloy sheet 120. For example, the value of B can be 0.2Bn, 0.4Bn, 0.5Bn, 0.7Bn, 0.8Bn, Bn, etc. When B is less than 0.2Bn, from... Figure 5As can be seen, the amorphous alloy sheet 120 has high iron loss, making it difficult to fully utilize its low iron loss advantage. When B is greater than Bn, since the saturation magnetic flux density has been exceeded, the excess is wasted and cannot play a corresponding role, failing to increase the motor's output power, and the excitation current will still increase, further increasing iron loss. Therefore, rationally designing the magnetic flux density of the stator core 110 to be between 0.2Bn and Bn can reduce iron loss while avoiding magnetic flux distribution imbalance and a decrease in permeability.

[0041] Among them, reference Figure 2 As shown, the number of slots in stator slot 116 is Q, and the minimum tooth width of tooth 112 is W. t The diameter of the largest inscribed circle of the multiple shoe parts 113 is D, and the air gap magnetic flux density between the stator assembly 100 and the rotor assembly of the motor is... The magnetic flux density of tooth 112 is ,satisfy:

[0042]

[0043] We can obtain:

[0044]

[0045] For the compressor motor, the air gap magnetic flux density The relationship between the saturation magnetic flux density Bn of the amorphous alloy sheet 120 and the following is satisfied:

[0046]

[0047] Since it is desirable to maximize the area of ​​stator slot 116 to increase the wire diameter of the winding and reduce copper loss, the minimum width W of tooth 112 is desired. t Without exceeding the saturation magnetic flux density, and to keep it as small as possible, we can derive the following from the two formulas above:

[0048]

[0049] By adopting the above scheme, and setting the stator core 110 to be composed of multiple stacked amorphous alloy sheets 120, the iron loss of the stator assembly 100 can be effectively reduced, thereby reducing the temperature rise of the motor. For the motor, it is desirable for the area of ​​the stator slot 116 to be as large as possible to increase the winding wire diameter and thus reduce copper loss, that is, it is desirable for the minimum width of the tooth portion 112 to be as small as possible. However, a smaller tooth portion 112 width is more likely to lead to magnetic field saturation. In order to rationally design the minimum tooth width of the tooth portion 112 to reduce the problem of increased magnetic voltage drop caused by magnetic field saturation, the minimum tooth width W of the tooth portion 112 is set to... tSetting the width within the range of 2πD / 9Q to 2πD / 3Q effectively increases the area of ​​the stator slot 116, while also mitigating the problem of increased magnetic voltage drop caused by magnetic field saturation, thereby reducing the current and improving motor efficiency. The aforementioned width limitation of the teeth 112 applies to stator cores 110 made of amorphous materials, effectively preventing magnetic circuit saturation.

[0050] Reference Figure 2 As shown in the embodiment of this utility model, the minimum width of the yoke 111 along the radial direction of the stator assembly 100 is W. y ,satisfy:

[0051]

[0052] First, analyze the minimum width W of the yoke 111. y The source of the range of values. Among them, the magnetic flux density of the yoke 111 is By, satisfying:

[0053]

[0054] For the compressor motor, the air gap magnetic flux density The relationship between the saturation magnetic flux density Bn of the amorphous alloy sheet 120 and the following is satisfied:

[0055]

[0056] Since it is desirable to maximize the area of ​​stator slot 116 to increase the wire diameter of the winding and reduce copper loss, the minimum width W of yoke 111 is desired. y The smaller the magnetic flux density, the better, without exceeding the saturation magnetic flux density. Based on the two formulas above, we can derive:

[0057]

[0058] Therefore, the minimum width W of the yoke 111 y Based on air gap magnetic flux density Based on the relationship between the saturation magnetic flux density Bn of the amorphous alloy sheet 120 and the magnetic flux density By of the yoke 111, this invention can improve the situation where the amorphous alloy magnetic circuit saturates prematurely, or the material is wasted due to excessive width, and the area of ​​the stator slot 116 is reduced. This invention introduces W... y The correlation formula with D and Q enables the dimensions of the yoke 111 to synergize with the magnetic properties of the amorphous alloy, maintaining magnetic circuit efficiency while optimizing material utilization.

[0059] Reference Figure 2As shown in the embodiment of this utility model, the number Q of stator slots 116 is 6, the stator inner diameter D is 60mm, and the stator axial length is 35mm. Based on the aforementioned formulas, the minimum tooth width W of the tooth portion 112 can be calculated. t Satisfies: 7mm≤W t ≤20.9mm, minimum width W of yoke 111 y Satisfies: 3.5mm≤W y ≤10.5mm. For example, W t The value can be 7mm, 10mm, 12mm, 16mm, 18mm, 20.9mm, etc., W y The value can be 3.5mm, 4mm, 6mm, 8mm, 10.5mm, etc. Among them, when W... t and W y When W takes any value within the above range, the motor efficiency is ≥95% based on actual measurements. For example, when W... t The value is 14.5mm, W y When the value is 6.3mm, the motor efficiency is ≥96% according to actual measurements.

[0060] When the number of slots Q is set to 6, the size range of the tooth 112 and the yoke 111 is limited by W. t and W y The numerical boundary, even if W t and W y By maximizing both values, the motor achieves high efficiency. This ensures that when using amorphous alloy sheets 120 in the stator core 110, magnetic flux density saturation due to an excessively small magnetic circuit cross-sectional area is avoided, while the area of ​​the stator slots 116 is prevented from decreasing due to an excessively large cross-sectional area. The lower limit of the tooth 112 width ensures effective transmission of the main magnetic flux in the tooth 112 magnetic circuit, while the upper limit controls the volume of the tooth 112 to prevent the area of ​​the stator slots 116 from becoming too small. Similarly, the lower limit of the yoke 111 width maintains the magnetic circuit carrying capacity of the yoke 111, while the upper limit also aims to prevent the area of ​​the stator slots 116 from becoming too small. This solution, by addressing the low saturation magnetic flux density characteristics of amorphous alloys and combining a layout with a slot number Q of 6, redefines the dimensional constraints of the tooth 112 and yoke 111. This allows the amorphous core to maintain effective main magnetic flux even under low iron loss conditions, suppressing the increase in winding current caused by magnetic saturation and reducing eddy current losses. This improves motor efficiency while ensuring the stability of the magnetic circuit operation.

[0061] Reference Figure 3 As shown in the embodiment of this utility model, the number Q of stator slots 116 is 12, the stator inner diameter D is 60mm, and the stator axial length is 25mm. Based on the aforementioned formulas, the minimum tooth width W of the tooth portion 112 can be calculated. t Satisfies: 3.5mm≤W t≤10.5mm, minimum width W of yoke 111 y Satisfies: 1.7mm≤W y ≤5.2mm. For example, W t The value can be 3.5mm, 4mm, 6mm, 7mm, 8mm, 10.5mm, etc., W y The value can be 1.7mm, 2mm, 3mm, 4mm, 5.2mm, etc. Among them, when W... t and W y When W takes any value within the above range, the motor efficiency is ≥95% based on actual measurements. For example, when W... t The value is 6.9mm, W y When the value is 5.1mm, the motor efficiency is ≥96% according to actual measurements.

[0062] Through the above technical solution, this application, when using amorphous alloy sheet 120 to replace silicon steel sheet, rationally designs the width of the tooth 112 and the width of the yoke 111, even if W t and W y By taking the maximum value, the motor also has high efficiency, which can effectively improve the magnetic field saturation phenomenon, maintain the stability of the main magnetic flux, and avoid abnormal increase in winding current due to increased magnetic voltage drop. The size range setting of the tooth section 112 and the yoke section 111 further ensures the mechanical strength and magnetic circuit efficiency of the stator core 110, thereby improving the overall operating performance of the motor.

[0063] Reference Figure 2 As shown in the embodiment of this utility model, the tooth width of the tooth portion 112 remains constant along the radial direction of the stator assembly 100. Maintaining a constant tooth width radially means that the width of the tooth portion 112 is equal at all radial positions throughout the entire tooth portion 112 region from the inner side of the yoke portion 111 to the connection point of the shoe portion 113. Maintaining a constant width of the tooth portion 112 in the radial direction makes the magnetic flux distribution more uniform along the tooth portion 112 path. Since the saturation magnetic flux density of amorphous alloy materials is low, if the width of the tooth portion 112 varies radially, it may lead to an excessively small local magnetic circuit cross-sectional area, causing excessively high magnetic flux density and premature saturation. By maintaining a constant tooth width, the magnetic circuit cross-sectional area remains consistent at all radial positions, avoiding excessive concentration of magnetic flux density in local areas, thereby reducing hysteresis losses and eddy current losses, reducing the temperature rise during motor operation, and improving the overall efficiency and service life of the amorphous alloy motor.

[0064] Reference Figure 2As shown in the embodiment of this utility model, the yoke 111 is provided with a plurality of mounting holes 114, which are spaced apart circumferentially along the stator assembly 100. The mounting holes 114 are through structures used to fix the stator core 110, allowing the stator assembly 100 to be fixed inside the compressor housing. For example, the mounting holes 114 can be implemented as through holes or threaded holes, and their number and installation position are determined according to the assembly requirements of the stator assembly 100. The circumferentially spaced mounting holes 114 can also be uniformly distributed. The yoke 111 serves as an annular support structure for the stator core 110, and its outer edge is provided with mounting holes 114 for connection to the compressor housing. The uniform circumferential distribution of the mounting holes 114 ensures that the stator core 110 experiences uniform stress during axial assembly, preventing localized stress concentration that could lead to deformation of the amorphous alloy sheet 120. Furthermore, the mounting hole 114 can be positioned at a geometrically symmetrical point on the outer edge of the yoke 111, such as the corner 115 region of the yoke 111. This multi-point fixing enhances the connection rigidity between the stator core 110 and the housing while maintaining magnetic circuit symmetry. The amorphous alloy sheet 120 is less prone to warping under assembly pressure, reducing the risk of interlayer misalignment and avoiding increased magnetic voltage drop caused by local magnetic circuit distortion.

[0065] Reference Figure 2 As shown in the embodiment of this utility model, the yoke 111 includes a plurality of corner portions 115 arranged circumferentially along the stator assembly 100, and a plurality of mounting holes 114 are correspondingly provided at the corner portions 115. The corner portion 115 refers to the geometrically protruding structure distributed circumferentially on the outer contour of the yoke 111, which can be implemented using a curved section with a rounded transition or a trapezoidal boss, used to form a local support area. The outer edge of the yoke 111 forms a plurality of support nodes through the circumferentially spaced corner portions 115, and each corner portion 115 is provided with a corresponding mounting hole 114. Due to the geometrically protruding features of the corner portions 115, the mounting holes 114 are confined within the area of ​​the corner portions 115, allowing the mounting load to be transferred to the main body of the yoke 111 through the corner portions 115, avoiding the problem of magnetic circuit blockage caused by the mounting holes 114 being directly opened in the magnetic flux area of ​​the yoke 111. Meanwhile, the spaced arrangement of the corner portions 115 ensures the uniformity of the circumferential stiffness of the yoke 111, preventing deformation of the stator core 110 due to uneven stress during installation. The corresponding arrangement of the corner portions 115 and the mounting holes 114 achieves a balance between mechanical stability and magnetic circuit efficiency, avoiding increased magnetic voltage drop and abnormal increase in winding current caused by installation deformation.

[0066] Continue to refer to Figure 2As shown in the embodiment of this utility model, the side of the boot portion 113 facing away from the tooth portion 112 is constructed as an arc-shaped surface 117. The arc-shaped surface 117 refers to a curved surface where the outer contour of the boot portion 113 connected to the tooth portion 112 is continuously curved. It can be implemented using a circular arc or parabolic geometry. By eliminating right-angle or acute-angle transitions, it facilitates cooperation with the rotor assembly to form an air gap of appropriate size. Simultaneously, the curvature of the arc-shaped surface 117 matches the magnetic field distribution of the stator slot 116, resulting in a smooth transition of magnetic lines of force at the junction of the boot portion 113 and the air gap. The radius of curvature of the arc-shaped surface 117 can be adjusted according to the magnetic circuit design requirements. For example, by optimizing the ratio of the radius of curvature to the width of the tooth portion 112, the magnetic flux density distribution can be further balanced, reducing hysteresis losses. Through geometric optimization, the arc-shaped surface 117 makes the magnetic field distribution more uniform, reduces magnetic voltage drop, thereby reducing winding current requirements. While reducing iron losses, it maintains effective transmission of the main magnetic flux, improving motor operating efficiency.

[0067] A compressor according to one embodiment of the present invention includes a rotor assembly, and further, a stator assembly 100 as described in the previous embodiment. The rotor assembly is disposed inside the stator assembly 100 and is rotatable relative to the stator assembly 100. The motor according to this embodiment of the present invention uses the stator assembly 100 of the previous embodiment. By setting the stator core 110 to be composed of multiple stacked amorphous alloy sheets 120, the iron loss of the stator assembly 100 can be effectively reduced, thereby reducing the temperature rise of the motor. For the motor, the area of ​​the stator slots 116 should be designed to be as large as possible to increase the winding wire diameter and thus reduce copper loss; that is, the minimum width of the tooth portion 112 should be as small as possible. However, a smaller tooth portion 112 width is more likely to cause magnetic field saturation, and the use of amorphous materials in the stator assembly 100 also makes the magnetic field more prone to saturation. In order to rationally design the minimum tooth width of the tooth section 112 and reduce the problem of increased magnetic voltage drop caused by magnetic field saturation, the minimum tooth width Wt of the tooth section 112 is set in the range of 2πD / 9Q to 2πD / 3Q. This can effectively increase the area of ​​the stator slot 116, and at the same time improve the problem of increased magnetic voltage drop caused by magnetic field saturation, thereby reducing the current and improving the working efficiency of the motor.

[0068] Since the compressor adopts all the technical solutions of the stator assembly 100 of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0069] This utility model discloses a refrigeration device according to one embodiment, including the compressor described in the above embodiment. The refrigeration device can be an air conditioner, refrigerator, etc. The refrigeration device of this utility model uses the compressor described in the above embodiment. The compressor, by setting the stator core 110 to be composed of multiple stacked amorphous alloy sheets 120, can effectively reduce the iron loss of the stator assembly 100, thereby reducing the temperature rise of the motor. For the motor, the area of ​​the stator slot 116 should be designed to be as large as possible to increase the winding wire diameter and thus reduce copper loss. That is, the smaller the minimum width of the tooth portion 112, the better. However, a smaller tooth portion 112 width is more likely to cause magnetic field saturation, and the use of amorphous materials in the stator assembly 100 also makes the magnetic field more prone to saturation. In order to rationally design the minimum tooth width of the tooth portion 112 to reduce the problem of increased magnetic voltage drop caused by magnetic field saturation, the minimum tooth width Wt of the tooth portion 112 is set in the range of 2πD / 9Q to 2πD / 3Q. This can effectively increase the area of ​​the stator slot 116, and at the same time improve the problem of increased magnetic voltage drop caused by magnetic field saturation, thereby reducing the current and improving the working efficiency of the motor.

[0070] Since the compressor adopts all the technical solutions of the motor in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0071] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A stator assembly, characterized in that, The stator core comprises a plurality of amorphous alloy sheets stacked axially. The stator core includes a yoke, teeth, and shoe. The yoke is annular. The teeth are provided in a plurality of positions along the circumference of the yoke. The plurality of teeth are spaced apart and one end is connected to the inner side of the yoke. The other end of the plurality of teeth is connected to the shoe. Stator slots are formed between adjacent teeth, shoe and yoke. Wherein, along the circumferential direction of the stator assembly, the minimum tooth width of the tooth portion is W. t The number of stator slots is Q, and on the axial projection plane perpendicular to the stator assembly, the diameter of the largest inscribed circle of the plurality of shoe portions is D, satisfying: .

2. The stator assembly according to claim 1, characterized in that: The minimum width of the yoke along the radial direction of the stator assembly is W. y ,satisfy: .

3. The stator assembly according to claim 2, characterized in that: The number of stator slots Q is 6, and the minimum tooth width W of the tooth portion t Satisfies: 7mm≤W t ≤20.9mm, the minimum width W of the yoke y Satisfies: 3.5mm≤W y ≤10.5mm.

4. The stator assembly according to claim 2, characterized in that: The number of stator slots Q is 12, and the minimum tooth width W of the tooth portion t Satisfies: 3.5mm≤W t ≤10.5mm, the minimum width W of the yoke y Satisfies: 1.7mm≤W y ≤5.2mm.

5. The stator assembly according to claim 1, characterized in that: The tooth width of the tooth portion remains constant along the radial direction of the stator assembly.

6. The stator assembly according to claim 1, characterized in that: The yoke is provided with a plurality of mounting holes, which are spaced apart circumferentially along the stator assembly.

7. The stator assembly according to claim 6, characterized in that: The yoke includes a plurality of corner portions arranged at intervals along the circumference of the stator assembly, and a plurality of mounting holes are provided one-to-one with the corner portions.

8. The stator assembly according to claim 1, characterized in that: The side of the boot portion opposite to the teeth is constructed as an arc-shaped surface.

9. A compressor, characterized in that, Includes the stator assembly as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that: Includes the compressor as described in claim 9.

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