Stator assembly, compressor and refrigeration equipment

Abstract

The invention discloses a stator assembly, a compressor and refrigeration equipment, and relates to the technical field of motors. The stator assembly comprises a stator core formed by stacking a plurality of amorphous alloy sheets, the stator core comprises a yoke part, a tooth part and a shoe part, and the stator core is formed by stacking a plurality of amorphous alloy sheets, so that the iron loss of the stator assembly can be reduced. For a motor, the area of a stator slot is expected to be as large as possible to increase the winding wire diameter so as to reduce copper loss, and the smaller the minimum width of a tooth part is, the better is, but the smaller the width of the tooth part is, the more likely to cause magnetic field saturation. In order to reasonably design the minimum tooth width of the tooth part so as to reduce the problem of magnetic voltage drop increase caused by magnetic field saturation, the minimum tooth width Wt of the tooth part is set in a range of 2piD / 9Q to 2piD / 3Q, so that the area of the stator slot can be effectively increased, the problem of magnetic voltage drop increase caused by magnetic field saturation can be improved, the magnitude of current can be reduced, and the service life of the stator slot can be prolonged. The working efficiency of the motor is improved.

Description

Technical Field

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

[0002] During operation, the stator assembly of the compressor generates iron loss. Iron loss refers to the energy loss generated by the motor core under the action of the alternating magnetic field, mainly including hysteresis loss and eddy current loss. The increase in iron loss will cause the motor temperature to rise, reducing the motor's service life and efficiency. To reduce iron loss, the silicon steel sheets that construct the stator core can be replaced with thinner amorphous alloy sheets. However, the saturation magnetic flux density of the amorphous alloy sheets is significantly lower than that of the silicon steel sheets. If the size of the amorphous motor is designed according to the traditional silicon steel motor concept, it is easy to cause the motor magnetic field to saturate, resulting in an increase in the magnetic voltage drop of the amorphous magnetic circuit and a significant decrease in the effective main magnetic flux of the amorphous motor. This will cause the winding current of the amorphous motor to be too large, and the efficiency will be reduced. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a stator assembly, wherein the stator core is made of amorphous material and the width of the teeth on the stator core is rationally designed to improve the operating efficiency of the motor.

[0004] The present invention also provides a compressor and a refrigeration device having the stator assembly.

[0005] According to the first aspect of the present invention, the stator assembly comprises a stator core composed of a plurality of amorphous alloy sheets stacked in the axial direction, the stator core comprising a yoke, a tooth portion and a shoe portion, the yoke being annular, the tooth portion being provided with a plurality of teeth, the plurality of teeth being spaced apart along the circumference of the yoke and one end being connected to the inner side of the yoke, the other ends of the plurality of teeth being respectively connected to the shoe portion, and stator slots being formed between adjacent teeth, the shoe portion and the yoke portion; wherein, along the circumference of the stator assembly, the minimum tooth width of the tooth portion is W t , the number of the 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 the boots is D, satisfying: .

[0006] The stator assembly according to the embodiment of the present invention has at least the following beneficial effects: By setting the stator core to be composed of multiple stacked amorphous alloy sheets, the iron loss of the stator assembly can be effectively reduced, thereby reducing the temperature rise of the motor. For the motor, the area of the stator slot is 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, the better. However, the smaller the tooth width, the easier it is to cause magnetic field saturation, and the stator assembly is more likely to cause magnetic field saturation after using amorphous materials. In order to reasonably design the minimum tooth width of the tooth to reduce the problem of increased magnetic pressure drop caused by magnetic field saturation, the minimum tooth width W of the tooth is set to 0. t Setting it within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of the stator slot, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the working efficiency of the motor.

[0007] 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: .

[0008] According to some embodiments of the present invention, the number Q of the stator slots is 6, and the minimum tooth width W of the tooth portion is t Meet: 7mm≤W t ≤20.9mm, the minimum width W of the yoke y Meet: 3.5mm≤W y ≤10.5mm.

[0009] According to some embodiments of the present invention, the number Q of the stator slots is 12, and the minimum tooth width W of the tooth portion is t Meet: 3.5mm≤W t ≤10.5mm, the minimum width W of the yoke y Meet: 1.7mm≤W y ≤5.2mm.

[0010] 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.

[0011] According to some embodiments of the present invention, the yoke is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged at intervals along the circumference of the stator assembly.

[0012] According to some embodiments of the present invention, the yoke includes a plurality of corner portions spaced apart along the circumferential direction of the stator assembly, and the plurality of mounting holes are provided in a one-to-one correspondence at the corner portions.

[0013] According to some embodiments of the present invention, a side of the shoe portion facing away from the tooth portion is configured as an arc-shaped surface.

[0014] The motor according to the second embodiment of the present invention includes the stator assembly described in the above embodiment.

[0015] The compressor according to the embodiment of the present invention has at least the following beneficial effects: By adopting the stator assembly of the embodiment of the first aspect, the stator assembly can effectively reduce the iron loss of the stator assembly by setting the stator core to be composed of multiple stacked amorphous alloy sheets, so as to reduce the temperature rise of the motor. For the motor, the area of the stator slot is 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, the better. However, the smaller the tooth width, the easier it is to cause magnetic field saturation, and the stator assembly is more likely to cause magnetic field saturation after using amorphous materials. In order to reasonably design the minimum tooth width of the tooth portion to reduce the problem of increased magnetic pressure drop caused by magnetic field saturation, the minimum tooth width W of the tooth portion is set to 0. t Setting it within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of the stator slot, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the working efficiency of the motor.

[0016] A refrigeration device according to an embodiment of the third aspect of the present invention includes the compressor described in the above embodiment.

[0017] The refrigeration equipment according to the embodiment of the present invention has at least the following beneficial effects: By adopting the compressor of the second embodiment, the stator assembly of the compressor can effectively reduce the iron loss of the stator assembly by setting the stator core to be composed of multiple stacked amorphous alloy sheets, so as to reduce the temperature rise of the motor. For the motor, the area of the stator slot is 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, the better. However, the smaller the tooth width, the easier it is to cause magnetic field saturation, and the stator assembly is more likely to cause magnetic field saturation after using amorphous materials. In order to reasonably design the minimum tooth width of the tooth portion to reduce the problem of increased magnetic pressure drop caused by magnetic field saturation, the minimum tooth width W of the tooth portion is set to 0. t Setting it within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of the stator slot, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the working efficiency of the motor.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 1 is a schematic structural diagram of a stator assembly according to an embodiment of the present invention; Figure 2 is a top view of a stator assembly according to an embodiment of the present invention; Figure 3 is a top view of a stator assembly according to another embodiment of the present invention; Figure 4 is a curve diagram showing the relationship between the magnetic field strength and the magnetic flux density of a stator assembly according to an embodiment of the present invention; Figure 5 It is a curve diagram showing the relationship between the magnetic flux density and the unit iron loss ratio of a stator assembly according to an embodiment of the present invention.

[0020] Reference numerals: Stator assembly 100 ; stator core 110 ; yoke 111 ; tooth 112 ; shoe 113 ; mounting hole 114 ; corner 115 ; stator slot 116 ; arcuate surface 117 ; amorphous alloy sheet 120 . DETAILED DESCRIPTION

[0021] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] In the prior art, compressor stator cores are typically constructed from laminated silicon steel sheets. However, these sheets exhibit significant hysteresis and eddy current losses during high-frequency operation, resulting in high iron losses. Amorphous alloys, with their thinner thickness and superior magnetic permeability, can effectively reduce iron losses. However, compared to silicon steel sheets, amorphous alloy sheets made from these materials have a lower saturation magnetic flux density.

[0026] For example, refer to Figure 4 As shown, Figure 4 The horizontal axis represents the magnetic field intensity, and the vertical axis represents the ratio of the current magnetic flux density B and 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 reaches the saturation magnetic flux density. Figure 4 The dotted line with squares in the middle represents the curve of the magnetic flux density ratio of a silicon steel sheet with a thickness of 0.3mm as the magnetic field strength changes, and the solid line with dots represents the curve of the magnetic flux density ratio of an amorphous alloy sheet as the magnetic field strength changes. As can be seen from the figure, as the magnetic field strength increases, both curves show an upward trend, that is, the current magnetic flux density will gradually approach the saturation magnetic flux density, and it can be clearly seen from the figure that under the same magnetic field strength, the amorphous alloy sheet will reach the saturation magnetic flux density faster than the silicon steel sheet. If the structural design of the traditional silicon steel motor is used, the amorphous alloy magnetic circuit is prone to local magnetic saturation, resulting in an increase in magnetic voltage drop and winding current, which in turn reduces the motor efficiency.

[0027] 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 for a motor of a compressor. The stator assembly 100 according to the embodiment of the present invention includes a stator core 110 and a winding. The stator core 110 is composed of a plurality of amorphous alloy sheets 120 stacked along the axial direction of the stator assembly 100. The stator core 110 includes a yoke 111, a tooth 112 and a boot 113. The yoke 111 is annular, and a plurality of teeth 112 are provided. Along the circumference of the yoke 111, a plurality of teeth 112 are arranged at intervals and one end is connected to the inner side of the yoke 111, and the other ends of the plurality of teeth 112 are respectively connected to the boot 113. Stator slots 116 are formed between adjacent teeth 112, boots 113 and yoke 111, and the winding passes through the stator slots 116 and is wound on the teeth 112. Wherein, along the circumference of the stator assembly 100, the minimum tooth width of the tooth 112 is W t , the number of stator slots 116 is Q, and on the axial projection plane perpendicular to the stator assembly 100, the diameter of the largest inscribed circle of the plurality of boots 113 is D, satisfying: .

[0028] Among them, the atomic arrangement of amorphous alloys is disordered, and there are basically no grain boundaries, which significantly reduces eddy current losses. Eddy current loss is one of the main sources of iron loss, especially in high-frequency motors, where eddy current loss rises sharply with increasing frequency. Since amorphous alloys have no grain boundaries, eddy current losses are greatly reduced, thereby 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 0.02 mm to 0.05 mm. The tooth portion 112 refers to a protruding structure extending inward from the yoke portion 111, which is used to guide magnetic flux and support the winding. The boot portion 113 refers to an extended portion at the end of the tooth portion 112, which can prevent the winding wound on the tooth portion 112 from detaching from the tooth portion 112. The stator slot 116 refers to the space enclosed by adjacent teeth 112, the yoke portion 111, and the boot portion 113, which is used to accommodate the winding.

[0029] First, the minimum tooth width W of the tooth portion 112 of the present invention is analyzed. t The range formula comes from: 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 to 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 figure represent the relationship between the ratio of the current magnetic flux density to the saturation magnetic flux density and the unit iron loss ratio at different electrical frequencies. Figure 5 As can be seen from the graph, at all four electrical frequencies, the corresponding curves all show a rapid decrease at first, followed by a gradual stabilization of the downward trend. Therefore, as the ratio of the current magnetic flux density to the saturation magnetic flux density increases, the unit iron loss ratio gradually decreases. That is, the closer the current magnetic flux density is to the saturation magnetic flux density, the lower the iron loss of the stator core 110.

[0030] Therefore, in order to ensure that the stator core 110 made of the amorphous alloy sheet 120 has sufficiently low iron loss, the magnetic flux density B of the stator core 110 should satisfy the following: 0.2Bn≤B≤Bn. The magnetic flux density B of the stator core 110 includes the magnetic flux density Bt of the teeth 112 and the magnetic flux density By of the yoke 111. 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, Figure 5As can be seen from the figure, the amorphous alloy sheet 120 has a high iron loss, making it difficult to fully utilize the low iron loss advantage of the amorphous alloy sheet 120. 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, and the output power of the motor cannot be improved. Moreover, the excitation current will still increase, and the iron loss will increase. Therefore, a reasonable design of the magnetic flux density of the stator core 110 between 0.2Bn and Bn can reduce iron loss while avoiding imbalance in magnetic flux distribution and a decrease in magnetic permeability.

[0031] Among them, reference Figure 2 As shown, the number of stator slots 116 is Q, and the minimum tooth width of the tooth portion 112 is W. t The diameter of the largest inscribed circle of the plurality of boots 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 the tooth 112 is ,satisfy:

[0032] We can get:

[0033] 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 satisfies:

[0034] Since the area of the stator slot 116 is expected to be as large as possible, thereby increasing the wire diameter of the winding to reduce copper loss, the minimum width W of the tooth portion 112 is expected to be t As small as possible without exceeding the saturation magnetic flux density, according to the above two formulas, it can be deduced that:

[0035] By adopting the above solution, by setting the stator core 110 to be composed of a plurality of 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 expected that the area of the stator slot 116 is as large as possible to increase the winding wire diameter and thus reduce copper loss, that is, it is hoped that the minimum width of the tooth portion 112 is as small as possible. However, the smaller the width of the tooth portion 112, the more likely it is to cause magnetic field saturation. In order to reasonably design the minimum tooth width of the tooth portion 112 to reduce the problem of increased magnetic pressure drop caused by magnetic field saturation, the minimum tooth width W of the tooth portion 112 is set to 0. tSetting the width of the tooth portion 112 within the range of 2πD / 9Q to 2πD / 3Q can effectively increase the area of the stator slot 116, while also improving the problem of increased magnetic voltage drop caused by magnetic field saturation, reducing the current and improving the operating efficiency of the motor. The above-mentioned width limit of the tooth portion 112 is applicable to stator cores 110 made of amorphous materials and can effectively prevent magnetic circuit saturation.

[0036] Reference Figure 2 As shown, in the embodiment of the present invention, along the radial direction of the stator assembly 100, the minimum width of the yoke 111 is W y ,satisfy:

[0037] First, the minimum width W of the yoke 111 is analyzed. y The source of the value range of . Among them, the magnetic flux density of the yoke 111 is By, which satisfies:

[0038] 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 satisfies:

[0039] Since the area of the stator slot 116 is expected to be as large as possible, thereby increasing the wire diameter of the winding to reduce copper loss, the minimum width W of the yoke 111 is expected to be y As small as possible without exceeding the saturation magnetic flux density. According to the above two formulas, it can be deduced that:

[0040] Therefore, the minimum width W of the yoke 111 is y Based on the air gap flux density The relationship between the saturation flux density Bn of the amorphous alloy sheet 120 and the flux density By of the yoke 111 can improve the situation where the amorphous alloy magnetic circuit is too early saturated, or the width is too large to cause material waste and the area of the stator slot 116 is reduced. y The correlation formula with D and Q enables the size of the yoke 111 to be coordinated with the magnetic properties of the amorphous alloy, thereby maintaining the magnetic circuit efficiency and optimizing the material utilization.

[0041] Reference Figure 2 As shown, in the embodiment of the present invention, the number Q of the stator slots 116 is 6, the stator inner diameter D is 60 mm, and the stator axial length is 35 mm. According to the above-mentioned relevant formula, the minimum tooth width W of the tooth portion 112 can be calculated. t Meet: 7mm≤W t≤20.9mm, the minimum width W of the yoke 111 y Meet: 3.5mm≤W y ≤10.5mm. For example, W t The value of can be 7mm, 10mm, 12mm, 16mm, 18mm, 20.9mm, etc. y The value of can be 3.5mm, 4mm, 6mm, 8mm, 10.5mm, etc. Among them, when W t and W y When the value of is within the above range, the efficiency of the motor is ≥95% according to actual measurement. For example, when W t The value of W is 14.5mm. y When the value is 6.3mm, the efficiency of the motor is ≥96% according to actual measurements.

[0042] When the number of slots Q is set to 6, the size range of the tooth portion 112 and the yoke portion 111 is limited by W t and W y The numerical limit of W t and W y The maximum values are taken, and the motor also has a higher efficiency, so that when the stator core 110 uses an amorphous alloy sheet 120, it can avoid the magnetic flux density saturation caused by the small cross-sectional area of the magnetic circuit, and prevent the area of the stator slot 116 from being reduced due to the large cross-sectional area. The lower limit of the width of the tooth 112 ensures that the magnetic circuit of the tooth 112 effectively transmits the main magnetic flux, and the upper limit controls the volume of the tooth 112 to avoid the area of the stator slot 116 being too small; the lower limit of the width of the yoke 111 maintains the magnetic circuit carrying capacity of the yoke 111, and the upper limit is also to avoid the area of the stator slot 116 being too small. This solution redefines the size constraint range of the tooth 112 and the yoke 111 by targeting the low saturation magnetic density characteristics of the amorphous alloy and combining it with a layout with a slot number Q of 6, so that the amorphous core can still maintain an effective main magnetic flux under low iron loss conditions, which not only suppresses the increase in winding current caused by magnetic saturation, but also reduces eddy current loss, thereby improving the efficiency of the motor while ensuring the working stability of the magnetic circuit.

[0043] Reference Figure 3 As shown, in the embodiment of the present invention, the number Q of the stator slots 116 is 12, the stator inner diameter D is 60 mm, and the stator axial length is 25 mm. According to the above-mentioned relevant formula, the minimum tooth width W of the tooth portion 112 can be calculated. t Meet: 3.5mm≤W t ≤10.5mm, minimum width W of yoke 111 y Meet: 1.7mm≤W y ≤5.2mm. For example, W t The value of can be 3.5mm, 4mm, 6mm, 7mm, 8mm, 10.5mm, etc. yThe value of can be 1.7mm, 2mm, 3mm, 4mm, 5.2mm, etc. Among them, when W t and W y When the value of is within the above range, the efficiency of the motor is ≥95% according to actual measurement. For example, when W t The value of W is 6.9mm. y When the value is 5.1mm, the efficiency of the motor is ≥96% according to actual measurements.

[0044] Through the above technical solution, when the amorphous alloy sheet 120 is used to replace the silicon steel sheet, the width of the tooth portion 112 and the width of the yoke portion 111 are reasonably designed. t and W y Taking the maximum values for both, the motor also achieves high efficiency, effectively improving magnetic field saturation, maintaining a stable main magnetic flux, and preventing abnormal increases in winding current due to increased magnetic voltage drop. The size ranges set for the teeth 112 and yoke 111 further ensure the mechanical strength and magnetic circuit efficiency of the stator core 110, thereby improving the overall operating performance of the motor.

[0045] Reference Figure 2 As shown, in an embodiment of the present invention, the tooth width of the tooth portion 112 remains unchanged along the radial direction of the stator assembly 100. The tooth width remaining unchanged in the radial direction means that in the entire tooth portion 112 area from the inner side of the yoke 111 to the connection with the boot portion 113, the width of the tooth portion 112 is equal at all radial positions. The tooth portion 112 maintains a constant width in the radial direction, so that the magnetic flux is more evenly distributed in the path of the tooth portion 112. Since the saturation magnetic flux density of the amorphous alloy material is low, if the width of the tooth portion 112 changes in the radial direction, it may cause the local magnetic circuit cross-sectional area to be too small, causing the magnetic flux density to be too high and saturated in advance. By keeping the tooth width constant, 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 loss and eddy current loss, reducing the temperature rise during motor operation, and improving the overall efficiency and service life of the amorphous alloy motor.

[0046] Reference Figure 2As shown, in an embodiment of the present invention, the yoke 111 is provided with a plurality of mounting holes 114, and the plurality of mounting holes 114 are arranged at intervals along the circumference of the stator assembly 100. The mounting hole 114 refers to a through structure for fixing the stator core 110, and the stator assembly 100 can be fixed in the housing of the compressor through the mounting hole 114. For example, the mounting hole 114 can be implemented in the form of a through hole or a threaded hole, and its number and installation position are determined according to the assembly requirements of the stator assembly 100. The plurality of mounting holes 114 arranged at intervals along the circumference can be evenly distributed along the mounting holes 114. Among them, the yoke 111 serves as an annular support structure for the stator core 110, and the mounting holes 114 are provided on its outer edge for connection with the housing of the compressor. The mounting holes 114 are evenly distributed along the circumference, so that the stator core 110 is subjected to uniform force during axial assembly, thereby avoiding deformation of the amorphous alloy sheet 120 caused by local stress concentration. Furthermore, mounting holes 114 can be located at geometrically symmetrical points on the outer edge of yoke 111, such as corners 115 of yoke 111. This multi-point fixation improves the rigidity of the connection between stator core 110 and the housing while maintaining magnetic circuit symmetry. This reduces the risk of warping of amorphous alloy sheets 120 under assembly pressure, reduces the risk of misalignment between layers of amorphous alloy sheets 120, and avoids increased magnetic voltage drop due to local magnetic circuit distortion.

[0047] Reference Figure 2 As shown, in an embodiment of the present invention, the yoke 111 includes a plurality of corners 115 arranged at intervals along the circumference of the stator assembly 100, and a plurality of mounting holes 114 are provided in a one-to-one correspondence at the corners 115. The corners 115 refer to geometric protrusions distributed circumferentially on the outer contour of the yoke 111, which can be realized by a curved section with a circular arc transition or a trapezoidal boss to form a local support area. The outer edge of the yoke 111 forms a plurality of support nodes through the circumferentially spaced corners 115, and each corner 115 is provided with a mounting hole 114. Since the corners 115 have geometric protrusion features, the mounting holes 114 are confined within the area of the corners 115, so that the installation load is transmitted to the main body of the yoke 111 through the corners 115, thereby 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. The spaced-apart arrangement of corners 115 also ensures uniform circumferential stiffness of yoke 111, preventing deformation of stator core 110 due to uneven forces during installation. The corresponding arrangement of corners 115 and mounting holes 114 achieves a balance between mechanical stability and magnetic circuit efficiency, preventing increased magnetic voltage drop and abnormal increases in winding current caused by installation deformation.

[0048] Continue to refer to Figure 2As shown, in an embodiment of the present invention, the side of the boot portion 113 facing away from the tooth portion 112 is constructed as an arc surface 117. The arc surface 117 refers to a curved surface with a continuously curved outer contour of the boot portion 113 connected to the tooth portion 112. It can be realized by adopting a circular arc or parabolic geometric shape. By eliminating right-angle or sharp-angle transitions, it is beneficial to cooperate with the rotor assembly to form an air gap of appropriate size. At the same time, the curvature of the arc surface 117 matches the magnetic field distribution of the stator slot 116, so that the magnetic lines of force form a smooth transition at the junction of the boot portion 113 and the air gap. The curvature radius of the arc surface 117 can be adjusted according to the requirements of the magnetic circuit design. For example, by optimizing the proportional relationship between the curvature radius and the width of the tooth portion 112, the magnetic flux density distribution is further balanced and the hysteresis loss is reduced. The arc surface 117 makes the magnetic field distribution more uniform through geometric optimization, reduces the magnetic voltage drop, and thus reduces the winding current demand. While reducing iron loss, it maintains the effective transmission of the main magnetic flux and improves the operating efficiency of the motor.

[0049] A compressor according to an embodiment of the present invention includes a rotor assembly and further a stator assembly 100 according to the above embodiment. The rotor assembly is arranged on the inner side of the stator assembly 100 and can rotate relative to the stator assembly 100. The motor according to the embodiment of the present invention adopts the stator assembly 100 according to the above embodiment, and by arranging the stator core 110 to be composed of a plurality of amorphous alloy sheets 120 stacked together, the iron loss of the stator assembly 100 can be effectively reduced to reduce the temperature rise of the motor. For the motor, the area of the stator slot 116 is designed to be as large as possible to increase the winding wire diameter and thus reduce the copper loss, that is, the smaller the minimum width of the tooth portion 112, the better. However, the smaller the width of the tooth portion 112, the easier it is to cause magnetic field saturation, and the stator assembly 100 is more likely to cause magnetic field saturation after using amorphous materials. In order to reasonably design the minimum tooth width of the tooth portion 112 and 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, which can effectively increase the area of the stator slot 116. At the same time, it can also improve the problem of increased magnetic voltage drop caused by magnetic field saturation, reduce the current, and improve the working efficiency of the motor.

[0050] Since the compressor adopts all the technical solutions of the stator assembly 100 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0051] A refrigeration device according to an embodiment of the present invention includes a compressor according to the above embodiment, and the refrigeration device can be an air conditioner, a refrigerator, etc. The refrigeration device according to the embodiment of the present invention adopts the compressor according to the above embodiment. The compressor is configured such that the stator core 110 is composed of a plurality of amorphous alloy sheets 120 stacked together, which can effectively reduce the iron loss of the stator assembly 100 and reduce the temperature rise of the motor. For the motor, the area of the stator slot 116 is 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, the smaller the width of the tooth portion 112, the easier it is to cause magnetic field saturation, and the stator assembly 100 is more likely to cause magnetic field saturation after using amorphous materials. In order to reasonably design the minimum tooth width of the tooth portion 112 to reduce the problem of increased magnetic pressure 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, which can effectively increase the area of the stator slot 116, while also improving the problem of increased magnetic pressure drop caused by magnetic field saturation, reducing the current size, and improving the working efficiency of the motor.

[0052] Since the compressor adopts all the technical solutions of the motor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0053] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. Stator assembly, characterized in that, The stator core comprises a plurality of amorphous alloy sheets stacked in an axial direction, the stator core comprising a yoke, a tooth portion, and a shoe portion. The yoke is annular, and a plurality of teeth portions are provided. The plurality of teeth portions are spaced apart along the circumference of the yoke portion, and one end of the plurality of teeth portions is connected to the inner side of the yoke portion. The other ends of the plurality of teeth portions are respectively connected to the shoe portion. Stator slots are formed between adjacent teeth portions, the shoe portions, and the yoke portion. Wherein, along the circumference of the stator assembly, the minimum tooth width of the tooth portion is W t , the number of the 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 the boots is D, satisfying: .

2. The stator assembly according to claim 1, characterized in that: Along the radial direction of the stator assembly, the minimum width of the yoke 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 is t Meet: 7mm≤W t ≤20.9mm, the minimum width W of the yoke y Meet: 3.5mm≤W y ≤10.5mm.

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

5. The stator assembly according to claim 1, wherein: 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, and the plurality of mounting holes are arranged at intervals along the circumferential direction of the stator assembly.

7. The stator assembly according to claim 6, characterized in that: The yoke includes a plurality of corner portions spaced apart along the circumferential direction of the stator assembly, and the plurality of mounting holes are provided in a one-to-one correspondence at the corner portions.

8. The stator assembly according to claim 1, characterized in that: A side of the shoe portion facing away from the tooth portion is configured as an arcuate surface.

9. A compressor, characterized in that Comprising the stator assembly according to any one of claims 1 to 8.

10. Refrigeration equipment, characterized in that: Comprising a compressor as claimed in claim 9.

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