Stator, motor, compressor and air handling device

Abstract

This application provides a stator, a motor, a compressor, and an air handling unit. The stator includes a stator core (1), which includes stator teeth (2) and a yoke. The stator teeth (2) are arranged at circumferential intervals along the yoke, and stator slots (3) are formed between adjacent stator teeth (2). Along the circumferential direction, the yoke corresponding to the stator teeth (2) is a first yoke (4), and the yoke corresponding to the stator slots (3) is a second yoke (5). A filling groove (6) is arranged on the second yoke (5), and the filling groove (6) is filled with a soft magnetic material (7). The permeability of the soft magnetic material (7) is greater than that of the yoke. According to the stator of this application, the influence of thermal stress on the motor can be reduced, the iron loss of the motor can be reduced, and the motor efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to a stator, motor, compressor, and air handling equipment. Background Technology

[0002] Among many refrigeration-type household appliances, such as refrigerators, air conditioners, and air purifiers, compressors are required. The compressor housing and the internal motor stator are often thermally fitted. When heated, the compressor housing expands and fits over the stator. Due to the interference fit between the inner diameter of the housing and the outer diameter of the stator, the housing applies a clamping force to the stator after cooling, thus securing the stator. The motor stator is often made of thin, non-oriented silicon steel sheets. This silicon steel sheet is a silicon steel alloy with a very low carbon content, possessing excellent magnetic permeability and magnetic induction characteristics, but it is very sensitive to stress. Studies have shown that mechanical stress can cause plastic deformation at the edges of the silicon steel sheet, changing the orientation of the internal magnetic domains and deteriorating the magnetic properties of the silicon steel sheet.

[0003] Experimental results show that, compared with the case without heat fitting, the iron loss of the motor increases sharply after heat fitting due to the influence of compressive stress. The no-load iron loss increases by about 1.3 times, and the load iron loss increases by about 1.7 times. The motor efficiency decreases by about 1.7% in the experiment.

[0004] Therefore, the mechanical stress generated by the heat-shrink compressive stress on the motor stator will increase the iron loss of the motor and reduce the efficiency of the motor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by this application is to provide a stator, motor, compressor and air treatment equipment that can reduce the impact of thermal stress on the motor, reduce motor iron loss and improve motor efficiency.

[0006] To address the aforementioned problems, this application provides a stator including a stator core. The stator core includes stator teeth and a yoke. The stator teeth are arranged at circumferential intervals along the yoke, and stator slots are formed between adjacent stator teeth. Along the circumferential direction, the yoke corresponding to the stator teeth is a first yoke, and the yoke corresponding to the stator slots is a second yoke. A filling groove is arranged on the second yoke, and the filling groove is filled with a soft magnetic material. The permeability of the soft magnetic material is greater than the permeability of the yoke.

[0007] Preferably, in a cross section perpendicular to the central axis of the stator core, soft magnets are respectively arranged on both sides of the same second yoke, the central angle of the stator circle occupied by the minimum distance between two adjacent soft magnets is a, and the included angle between the center lines of two adjacent stator teeth is b, where 0.13≤a / b≤0.64.

[0008] Preferably, in a cross section perpendicular to the central axis of the stator core, soft magnetic bodies are respectively provided on both sides of the same second yoke, and the soft magnetic bodies are symmetrical about the center line of the stator slot corresponding to the second yoke.

[0009] Preferably, in a cross section perpendicular to the central axis of the stator core, the minimum distance between the soft magnet on the side closest to the stator teeth along the circumference and the outer circle of the stator core is L1, and the radial length of this side is H1. The minimum distance between the soft magnet on the side furthest from the stator teeth along the circumference and the outer circle of the stator core is L2, and the radial length of this side is H2. L1≤L2<L1+0.9*H1, H1>H2 and H1≠0.

[0010] Preferably, in a cross section perpendicular to the central axis of the stator core, the minimum distance between the side of the soft magnet closest to the stator teeth along the circumferential direction and the outer circle of the stator core is L1, and the radial thickness of the second yoke is F1, where L1≤0.3*F1.

[0011] Preferably, in a cross section perpendicular to the central axis of the stator core, the minimum distance between the side of the soft magnet closest to the stator teeth along the circumferential direction and the outer circle of the stator core is L1, the radial length of this side is H1, and the radial thickness of the second yoke is F1, where L1≤H1≤0.5*F1.

[0012] Preferably, in a cross section perpendicular to the central axis of the stator core, the soft magnet includes a first end point and a second end point on the circumferential side near the stator tooth. The first end point is located radially outside the second end point. With the central axis of the stator as the center, the circle containing the first end point and the center line of the nearest stator tooth form a first intersection point. The distance between the first intersection point and the first end point is J1. The circle containing the second end point and the center line of the nearest stator tooth form a second intersection point. The distance between the second intersection point and the second end point is J2. Where |J1-J2| ≤ 0.1 mm.

[0013] Preferably, in a cross section perpendicular to the central axis of the stator core, the area of ​​the filling groove is S1, and the filling area of ​​the soft magnet in the filling groove is S2, wherein S2 / S1≥0.75.

[0014] Preferably, in a cross section perpendicular to the central axis of the stator core, the central angle of the stator circle occupied by the second yoke is Z1, and the central angle of the stator circle occupied by a single soft magnet is Z2, wherein Z2 / Z1≤0.5.

[0015] Preferably, in a cross section perpendicular to the central axis of the stator core, with the central axis of the stator as the center, the radius of the circle containing the point where the soft magnet is at its minimum distance from the outer circle of the stator is R1, the radius of the circle containing the point where the soft magnet is at its maximum distance from the outer circle of the stator is R2, and the radial thickness of the second yoke is F1, wherein (R1-R2)≤0.38*F1.

[0016] Preferably, in a cross section perpendicular to the central axis of the stator core, with the central axis of the stator as the center, the outer diameter of the stator core is D1, the inner diameter is D2, the radius of the circle containing the point where the soft magnet is at its minimum distance from the outer circle of the stator is R1, and the radius of the circle containing the point where the soft magnet is at its maximum distance from the outer circle of the stator is R2, and D1 / D2*0.86≥R1 / R2.

[0017] Preferably, the soft magnetic material comprises soft magnetic materials with different permeabilities, wherein the maximum permeability of the soft magnetic material is μ3 and the minimum permeability is μ4, and μ3 / μ4≤1.1.

[0018] Preferably, within a cross-section perpendicular to the central axis of the stator core, the circumferential lengths and / or radial lengths of different soft magnets within the same second yoke are different.

[0019] Preferably, the circumferential angle of the soft magnet with the larger circumferential angle is set as U1, and the circumferential angle occupied by the other soft magnet on the same second yoke is U2, where 0.82*U1>U2.

[0020] Preferably, when the circumferential lengths of different soft magnets within the same second yoke are different, the average circumferential length of all soft magnets is T1, the maximum circumferential length is T2, and the minimum circumferential length is T3, where T2-T3≤0.05*T1.

[0021] Preferably, two soft magnets are provided in the same second yoke. When the circumferential lengths of the different soft magnets in the same second yoke are different, the stator central angle occupied by the second yoke is Z1, and the maximum stator central angle occupied by the soft magnets is Y2 and Y3, where Y2>Y3 and (0.8*Y2+Y3) / Z1≤0.48.

[0022] Preferably, in a cross section perpendicular to the central axis of the stator core, the circumferential lengths of two soft magnets adjacent to the same stator tooth are the same.

[0023] Preferably, in a cross section perpendicular to the central axis of the stator core, with the central axis of the stator as the center, the angle between the circle containing the point on the outer circle of the stator closest to the soft magnet and the center line of the nearest stator tooth is Q1, and the angle between the circle containing the point on the outer circle of the stator farthest from the soft magnet and the center line of the nearest stator tooth is Q2, where Q1 > Q2.

[0024] Preferably, two soft magnets are provided in the same second yoke. In a cross section perpendicular to the central axis of the stator core, the maximum stator central angle occupied by the soft magnet on the magnetic field line entry side is Y2, and the maximum stator central angle occupied by the soft magnet on the magnetic field line exit side is Y3, where Y2 > Y3.

[0025] Preferably, the axial height of the stator core is P1, and the overall axial height of the soft magnet is P2, where P2 ≥ 0.89 * P1.

[0026] Preferably, the cross-sectional shape of the filling groove is polygonal or fan-shaped.

[0027] According to another aspect of this application, an electric motor is provided, including a stator, which is the stator described above.

[0028] According to another aspect of this application, a compressor is provided, including a stator, which is the stator described above.

[0029] Preferably, the compressor further includes a housing, the interference fit between the housing and the stator on one side is δ1, and the minimum distance between the soft magnet on the side closest to the stator teeth along the circumferential direction and the outer circle of the stator core in a cross section perpendicular to the central axis of the stator core is L1, where L1≥19*δ1.

[0030] According to another aspect of this application, an air handling device is provided, including a compressor, which is the compressor described above.

[0031] The stator provided in this application includes a stator core, which includes stator teeth and a yoke. The stator teeth are arranged at intervals along the circumference of the yoke, and stator slots are formed between adjacent stator teeth. Along the circumferential direction, the yoke corresponding to the stator teeth is a first yoke, and the yoke corresponding to the stator slots is a second yoke. A filling groove is arranged on the second yoke, and the filling groove is filled with a soft magnetic material. The permeability of the soft magnetic material is greater than the permeability of the yoke. By placing a soft magnetic material with higher permeability on the second yoke corresponding to the stator slot, the permeability distribution of the second yoke can be altered, thereby regulating the magnetic lines of force entering the second yoke. This causes the magnetic lines of force to flow towards the soft magnetic material with higher permeability, changing the path of the magnetic lines of force and reducing the number of magnetic lines of force flowing towards the stator yoke subjected to mechanical stress. This alters the magnetic circuit orientation on the stator, reduces losses in the magnetic circuit, allows for more efficient energy utilization, improves motor efficiency, reduces motor operating current, enhances the motor's demagnetizing ability, reduces copper and iron losses, and improves motor operational reliability. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the stator structure according to an embodiment of this application;

[0033] Figure 2 This is a diagram showing the magnetic field lines of a stator in the prior art.

[0034] Figure 3 This is a diagram showing the magnetic field lines of the stator in an embodiment of this application.

[0035] Figure 4This is a dimensional structural diagram of the stator according to an embodiment of this application;

[0036] Figure 5 This is a dimensional structural diagram of the stator according to an embodiment of this application;

[0037] Figure 6 This is a dimensional structural diagram of the stator according to an embodiment of this application;

[0038] Figure 7 This is a structural diagram of the stator according to an embodiment of this application;

[0039] Figure 8 This is a dimensional structural diagram of the stator according to an embodiment of this application;

[0040] Figure 9 This is a structural diagram of the stator according to an embodiment of this application;

[0041] Figure 10 This is a dimensional structural diagram of the stator according to an embodiment of this application;

[0042] Figure 11 This is a diagram showing the magnetic field lines of the stator in an embodiment of this application.

[0043] Figure 12 A comparison chart showing the increase in iron loss of the stator before and after heat fitting.

[0044] The reference numerals in the attached figures are as follows:

[0045] 1. Stator core; 2. Stator teeth; 3. Stator slots; 4. First yoke; 5. Second yoke; 6. Filler slot; 7. Soft magnet. Detailed Implementation

[0046] See also Figures 1 to 12 As shown, according to an embodiment of this application, the stator includes a stator core 1, the stator core 1 includes stator teeth 2 and a yoke, the stator teeth 2 are arranged at intervals along the circumference of the yoke, and stator slots 3 are formed between adjacent stator teeth 2. Along the circumferential direction, the yoke corresponding to the stator teeth 2 is a first yoke 4, and the yoke corresponding to the stator slots 3 is a second yoke 5. A filling groove 6 is arranged on the second yoke 5, and a soft magnetic material 7 is filled in the filling groove 6. The permeability of the soft magnetic material 7 is greater than the permeability of the yoke.

[0047] By setting a soft magnetic material 7 with higher permeability on the second yoke 5 corresponding to the position of stator slot 3, the permeability distribution of the second yoke 5 can be changed by the soft magnetic material 7, thereby adjusting the magnetic lines of force entering the second yoke 5. This causes the magnetic lines of force to flow towards the soft magnetic material 7 with higher permeability, changing the path of the magnetic lines of force and reducing the number of magnetic lines of force flowing towards the stator yoke which is subject to mechanical stress. This changes the magnetic circuit orientation on the stator, reduces losses on the magnetic circuit, allows energy to be utilized more fully, improves motor efficiency, reduces motor operating current, improves motor demagnetization capability, reduces copper and iron losses, and improves motor operational reliability.

[0048] Through the Figure 2 The magnetic field lines of the stator in the existing technology and Figure 3 By comparing the magnetic field lines of the stator in this application, it can be clearly seen that the magnetic field lines that originally headed toward the interference fit position of the stator are moved closer to the soft magnetic body 7 under the influence of the soft magnetic body 7, thereby deviating from the interference fit position of the stator. This reduces the number of magnetic field lines affected by the mechanical stress generated by the interference fit of the stator, improves the stator magnetic circuit, reduces iron loss, and increases motor efficiency.

[0049] In this embodiment, the structure between the first yoke 4 and the second yoke 5 is divided as follows: In a section perpendicular to the central axis of the stator core 1, an extension line of the radial side of the stator tooth 2 is drawn, such that the radial side of the stator tooth 2 can divide the yoke. The part located on the radial side of the stator tooth 2 closer to the stator tooth 2 is the first yoke 4, and the part located on the radial side of the stator tooth 2 away from the stator tooth 2 is the second yoke 5. See [link to documentation] for details. Figure 8 As shown.

[0050] In a cross section perpendicular to the central axis of the stator core 1, soft magnets 7 are respectively arranged on both sides of the circumference of the same second yoke 5. The central angle of the stator circle occupied by the minimum distance between two adjacent soft magnets 7 is a, and the included angle between the center lines of two adjacent stator teeth 2 is b, where 0.13≤a / b≤0.64.

[0051] The stator central angle 'a' represents the distance between two adjacent soft magnetic bodies 7, and 'b' represents the distance between the center lines of two adjacent stator teeth 2. By properly setting the ratio between 'a' and 'b', the distance between two adjacent soft magnetic bodies 7 can be ensured to be appropriate, thus avoiding the magnetic circuit from taking a path with high losses, i.e., the part with high stress iron loss. When 'a' / b exceeds this range, the magnetic field guiding ability of the soft magnetic body 7 will weaken, the motor flux linkage will decrease, the motor operating current will increase, and the efficiency will decrease accordingly.

[0052] The characteristics of magnetic field lines determine that they will travel through regions with high permeability and sharp edges. Therefore, the permeability of the soft magnet 7 on the stator core 1 is μ1, and the permeability of the yoke is μ2, which is made of silicon steel sheet or other materials. The two satisfy μ1 > μ2. In addition, the ratio between a and b is limited, which allows the magnetic field lines to move perfectly along the preset path without saturation problems, thereby further improving motor efficiency and performance.

[0053] Within a cross-section perpendicular to the central axis of the stator core 1, soft magnetic bodies 7 are respectively arranged on both circumferential sides of the same second yoke 5. The soft magnetic bodies 7 are symmetrical about the centerline of the stator slot 3 corresponding to the second yoke 5. In this embodiment, each second yoke 5 is provided with a corresponding soft magnetic body 7, and at least two soft magnetic bodies 7 located in the same second yoke 5 are symmetrical about the centerline of the stator slot 3. This ensures that the back EMF harmonics generated by the motor during operation are symmetrical, thus making the motor operation more stable and generating less noise at 2f harmonic frequencies.

[0054] In a cross-section perpendicular to the central axis of the stator core 1, the minimum distance between the soft magnet 7 and the outer circle of the stator core 1 along the circumferential direction, near the stator tooth 2, is L1, and the radial length of this side is H1. The minimum distance between the soft magnet 7 and the outer circle of the stator core 1 along the circumferential direction, away from the stator tooth 2, is L2, and the radial length of this side is H2. L1≤L2<L1+0.9*H1, H1>H2, and H1≠0. Since the soft magnet 7 needs to be arranged on the stator core 1, the structural design of the soft magnet 7 will have a certain impact on the structural strength of the stator core 1 itself. By limiting the structural dimensions of the soft magnet 7, the impact of this design on the structural strength of the stator core itself can be minimized, and it can also play a role in guiding magnetic lines of force, reducing the use of soft magnetic materials.

[0055] In a cross-section perpendicular to the central axis of the stator core 1, the minimum distance between the soft magnet 7 and the outer circle of the stator core 1 along the circumferential direction near the stator tooth 2 is L1, and the radial thickness of the second yoke 5 is F1, where L1≤0.3*F1. Since the stator core 1 of this application is heat-fitted inside the compressor housing, the stator core 1 itself must have a certain structural strength. However, opening holes in the stator core 1 will have a certain impact on the strength of the stator core 1. According to simulation and experimental results, the radial length of the soft magnet 7 has a significant impact on the structural strength of the stator core 1 itself. When the dimensions of this application are designed such that L1≤0.3*F1, the opening of the filling groove 6 has almost no impact on the stator strength.

[0056] In a cross-section perpendicular to the central axis of the stator core 1, the minimum distance between the soft magnet 7 and the outer circle of the stator core 1 along the circumferential direction near the stator tooth 2 is L1, the radial length of this side is H1, and the radial thickness of the second yoke 5 is F1, where L1≤H1≤0.5*F1. The size of the soft magnet 7 is related to the outer diameter of the stator core 1 and the radial thickness of the yoke. In addition to structural strength, the problem of magnetic circuit saturation must also be considered. If H1 is too large, material is wasted, and the structural strength of the stator core 1 will decrease sharply. If H1 is too small, the magnetic lines of force will not be completely converged, and the motor efficiency will not reach the optimal level. By utilizing the above-mentioned limitations of this embodiment, the position and size of the soft magnet 7 and the relationship between the radial thickness of the yoke can be reasonably limited, and the magnetic lines of force can be guided with the least amount of material.

[0057] The soft magnet 7 near the stator tooth 2 has the function of concentrating the magnetic lines of force coming from the tooth. If the two points on this side of the soft magnet 7 near the stator tooth 2 are too far apart, it will cause the magnetic lines of force to become disordered. As a result, some of the magnetic lines of force will pass through the high-speed rail loss area, causing the loss to increase and the motor efficiency to decrease. Therefore, it is necessary to reasonably limit the size of the side of the soft magnet 7 near the stator tooth 2.

[0058] In this embodiment, within a cross-section perpendicular to the central axis of the stator core 1, the soft magnet 7 includes a first endpoint and a second endpoint along its circumferential side near the stator tooth 2. The first endpoint is located radially outside the second endpoint. With the central axis of the stator as the center, the circle containing the first endpoint and the center line of the nearest stator tooth 2 form a first intersection point, and the distance between the first intersection point and the first endpoint is J1. The circle containing the second endpoint and the center line of the nearest stator tooth 2 form a second intersection point, and the distance between the second intersection point and the second endpoint is J2, where |J1-J2| ≤ 0.1 mm.

[0059] In a cross-section perpendicular to the central axis of the stator core 1, the area of ​​the filling slot 6 is S1, and the filling area of ​​the soft magnet 7 within the filling slot 6 is S2, where S2 / S1 ≥ 0.75. The soft magnet 7 is placed in the filling slot 6 to form an auxiliary soft magnet structure. The soft magnet 7 does not need to completely fill the auxiliary soft magnet slot, but the focusing and magnetic conduction effects will be slightly worse. Therefore, it is necessary to limit the filling area ratio of the soft magnet 7 within the filling slot 6 to avoid a significant decrease in the permeability of the soft magnet 7, which would fail to meet the magnetic conduction requirements.

[0060] In a cross section perpendicular to the central axis of the stator core 1, the stator central angle occupied by the second yoke 5 is Z1, and the stator central angle occupied by the single soft magnetic body 7 is Z2, where Z2 / Z1≤0.5.

[0061] In a cross-section perpendicular to the central axis of the stator core 1, with the central axis of the stator as the center, the radius of the circle containing the point where the distance between the soft magnet 7 and the outer circle of the stator is the smallest is R1, and the radius of the circle containing the point where the distance between the soft magnet 7 and the outer circle of the stator is the largest is R2. The radial thickness of the second yoke 5 is F1, where (R1-R2)≤0.38*F1. This limits the relationship between the maximum radial thickness of the soft magnet 7 and the radial thickness of the second yoke 5, avoiding the problem that the structural strength of the second yoke 5 will deteriorate due to the excessive maximum radial thickness of the soft magnet 7, thus affecting the performance of the motor.

[0062] In a cross section perpendicular to the central axis of the stator core 1, with the central axis of the stator as the center, the outer diameter of the stator core 1 is D1, the inner diameter is D2, the radius of the circle containing the point where the soft magnetic body 7 is at its minimum distance from the outer circle of the stator is R1, and the radius of the circle containing the point where the soft magnetic body 7 is at its maximum distance from the outer circle of the stator is R2, and D1 / D2*0.86≥R1 / R2.

[0063] The soft magnetic material 7 comprises soft magnetic materials with different permeabilities. The maximum permeability of the soft magnetic material is μ3, and the minimum permeability is μ4, where μ3 / μ4 ≤ 1.1. The stator core 1 has N stator teeth 2, correspondingly 2N soft magnetic materials 7, which can be composed of 2N materials with different permeabilities. However, since the back electromotive force of each phase must remain basically consistent during motor operation, exceeding a certain range will lead to increased motor vibration and decreased efficiency. Within the range of μ3 / μ4 ≤ 1.1, it will not have a significant impact on the stator performance of this application.

[0064] Within a cross section perpendicular to the central axis of the stator core 1, the circumferential lengths and / or radial lengths of different soft magnetic bodies 7 within the same second yoke 5 are different.

[0065] In one embodiment, the circumferential angle of the soft magnet 7 with a larger circumferential angle is set as U1, and the circumferential angle occupied by the other soft magnet 7 on the same second yoke 5 is U2, where 0.82*U1>U2.

[0066] When the circumferential lengths of different soft magnetic bodies 7 within the same second yoke 5 are different, the average circumferential length of all soft magnetic bodies 7 is T1, the maximum circumferential length is T2, and the minimum circumferential length is T3, where T2-T3≤0.05*T1. Based on simulation results, making the soft magnetic bodies 7 on each second yoke 5 into unequal length structures can improve the back EMF harmonics to some extent.

[0067] In a cross section perpendicular to the central axis of the stator core 1, the circumferential lengths of two soft magnets 7 adjacent to the same stator tooth 2 are the same, which can improve the uniformity of magnetic field lines on both sides of the stator tooth 2.

[0068] Two soft magnetic bodies 7 are provided in the same second yoke 5. When the circumferential lengths of the different soft magnetic bodies 7 in the same second yoke 5 are different, the stator central angle occupied by the second yoke 5 is Z1, and the maximum stator central angle occupied by the soft magnetic bodies 7 is Y2 and Y3, where Y2>Y3 and (0.8*Y2+Y3) / Z1≤0.48. Through the above limitation, the angles occupied by the soft magnetic bodies 7 in the same second yoke 5 in the circumferential direction can form the optimal relationship, effectively reducing the stator iron loss of the motor.

[0069] In a cross section perpendicular to the central axis of the stator core 1, with the central axis of the stator as the center, the angle between the circle containing the point on the outer circle of the soft magnetic body 7 that is closest to the outer circle of the stator and the center line of the nearest stator tooth 2 is Q1, and the angle between the circle containing the point on the outer circle of the soft magnetic body 7 that is farthest from the outer circle of the stator and the center line of the nearest stator tooth 2 is Q2, where Q1 > Q2.

[0070] Two soft magnets 7 are disposed within the same second yoke 5. In a cross-section perpendicular to the central axis of the stator core 1, the maximum stator central angle occupied by the soft magnet 7 on the magnetic field inlet side is Y2, and the maximum stator central angle occupied by the soft magnet 7 on the magnetic field outlet side is Y3, where Y2 > Y3. Setting the size of the soft magnets 7 according to the motor rotation direction allows the stator to generate a larger flux linkage, resulting in a smaller operating current and reducing the risk of demagnetization.

[0071] The axial height of the stator core 1 is P1, and the overall axial height of the soft magnet 7 is P2, where P2 ≥ 0.89 * P1. The core can be formed by splicing a core without the soft magnet 7 and a core with the soft magnet 7. The splicing order can be arbitrary, as long as the overall axial height of the stator core 1 is P1. The portion occupied by the soft magnet 7 can be discontinuous and segmented. The overall axial height of the spliced ​​soft magnet 7 is P2. When P2 ≥ 0.89 * P1, the overall performance of the stator core 1 is basically the same as that of a stator core 1 entirely equipped with the soft magnet 7, and the cost is lower.

[0072] The cross-sectional shape of the filling groove 6 is polygonal or fan-shaped.

[0073] For example, the filling groove 6 can be a triangle, a quadrilateral, or the like.

[0074] When the cross-sectional shape of the filling groove 6 is a fan-shaped ring, the mechanical strength of the yoke of the stator core 1 can be improved, the use of soft magnetic materials can be reduced, and the processing difficulty of the stator core 1 is also reduced.

[0075] According to an embodiment of this application, the motor includes a stator, which is the stator described above.

[0076] According to an embodiment of this application, the compressor includes a stator, which is the stator described above.

[0077] The compressor also includes a housing, with a single-sided interference fit of δ1 between the housing and the stator. In a cross-section perpendicular to the central axis of the stator core 1, the minimum distance between the soft magnet 7 on the side of the stator tooth 2 along the circumferential direction and the outer circle of the stator core 1 is L1, where L1≥19*δ1.

[0078] The soft magnet 7 is designed according to this size, and it is positioned exactly along the stress-affected iron loss region, so that the magnetic field lines do not pass through the high iron loss region, effectively controlling motor losses and improving motor performance.

[0079] According to an embodiment of this application, the air handling equipment includes a compressor, which is the compressor described above.

[0080] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0081] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A stator characterized by, The application relates to a stator core (1) comprising stator teeth (2) and a yoke, the stator teeth (2) being arranged in a circumferential direction and spaced apart along the yoke, and the stator slots (3) being formed between adjacent stator teeth (2), wherein the yoke corresponding to the stator teeth (2) is a first yoke (4), the yoke corresponding to the stator slots (3) is a second yoke (5), the second yoke (5) is provided with a filling slot (6), and the filling slot (6) is filled with a soft magnet (7), and the magnetic permeability of the soft magnet (7) is greater than that of the yoke. In a cross section perpendicular to the central axis of the stator core (1), the same second yoke (5) is provided with the soft magnets (7) on both sides in the circumferential direction, the minimum distance between adjacent soft magnets (7) occupies a stator central angle a, and the included angle between the center lines of adjacent stator teeth (2) is b, wherein 0.13<=a / b<=0.

64.

2. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the same second yoke (5) is provided with the soft magnets (7) on both sides in the circumferential direction, and the soft magnets (7) are symmetrical about the center line of the stator slot (3) corresponding to the second yoke (5).

3. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the minimum distance between the soft magnet (7) on the side close to the stator tooth (2) in the circumferential direction and the outer circle of the stator core (1) is L1, the radial length of the side is H1, the minimum distance between the soft magnet (7) on the side away from the stator tooth (2) in the circumferential direction and the outer circle of the stator core (1) is L2, the radial length of the side is H2, L1<=L2 4. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the minimum distance between the soft magnet (7) on the side close to the stator tooth (2) in the circumferential direction and the outer circle of the stator core (1) is L1, and the radial thickness of the second yoke (5) is F1, wherein L1<=0.3*F1.

5. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the minimum distance between the soft magnet (7) on the side close to the stator tooth (2) in the circumferential direction and the outer circle of the stator core (1) is L1, the radial length of the side is H1, and the radial thickness of the second yoke (5) is F1, wherein L1<=H1<=0.5*F1.

6. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the side edge of the soft magnet (7) on the side close to the stator tooth (2) in the circumferential direction comprises a first end point and a second end point, the first end point is located on the radial outer side of the second end point, the first end point is located on a circle with the central axis of the stator as the center, a first intersection is formed between the circle where the first end point is located and the center line of the nearest stator tooth (2), the distance between the first intersection and the first end point is J1, a second intersection is formed between the circle where the second end point is located and the center line of the nearest stator tooth (2), and the distance between the second intersection and the second end point is J2, wherein |J1-J2|<=0.1mm.

7. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the area of the filling slot (6) is S1, and the filling area of the soft magnetic body (7) in the filling slot (6) is S2, wherein S2 / S1≥0.

75.

8. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the central angle of the stator occupied by the second yoke portion (5) is Z1, and the central angle of the stator occupied by a single soft magnetic body (7) is Z2, wherein Z2 / Z1≤0.

5.

9. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), with the central axis of the stator as the center, the radius of the circle on which the point of the soft magnetic body (7) with the minimum distance from the outer circle of the stator is located is R1, the radius of the circle on which the point of the soft magnetic body (7) with the maximum distance from the outer circle of the stator is located is R2, and the radial thickness of the second yoke portion (5) is F1, wherein (R1-R2)≤0.38*F1.

10. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), with the central axis of the stator as the center, the outer diameter of the stator core (1) is D1, the inner diameter is D2, the radius of the circle on which the point of the soft magnetic body (7) with the minimum distance from the outer circle of the stator is located is R1, the radius of the circle on which the point of the soft magnetic body (7) with the maximum distance from the outer circle of the stator is located is R2, and D1 / D2*0.86≥R1 / R2.

11. The stator of claim 1, wherein The soft magnetic body (7) comprises soft magnetic materials with different magnetic permeabilities, the maximum magnetic permeability of the soft magnetic material is μ3, and the minimum magnetic permeability is μ4, wherein μ3 / μ4≤1.

1.

12. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the circumferential lengths of different soft magnetic bodies (7) in the same second yoke portion (5) are different and / or the radial lengths are different.

13. The stator of claim 12, characterized in that, The circumferential angle of one soft magnetic body (7) with a larger circumferential angle is set to U1, and the circumferential angle of another soft magnetic body (7) on the same second yoke portion (5) is U2, wherein 0.82*U1>U2.

14. The stator of claim 12, wherein, When the circumferential lengths of different soft magnetic bodies (7) in the same second yoke portion (5) are different, the average value of the circumferential lengths of all the soft magnetic bodies (7) is T1, the maximum circumferential length is T2, and the minimum circumferential length is T3, wherein T2-T3≤0.05*T1.

15. The stator of claim 12, wherein, Two soft magnetic bodies (7) are arranged in the same second yoke portion (5), when the circumferential lengths of different soft magnetic bodies (7) in the same second yoke portion (5) are different, the central angle of the stator occupied by the second yoke portion (5) is Z1, and the maximum central angle of the stator occupied by the soft magnetic body (7) is Y2, Y3, wherein Y2>Y3, and (0.8*Y2+Y3) / Z1≤0.

48.

16. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the circumferential lengths of two soft magnetic bodies (7) adjacent to the same stator tooth (2) are the same.

17. The stator of claim 1, wherein In a cross section perpendicular to the central axis of the stator core (1), the angle between the circle on which the point of the soft magnet (7) closest to the outer circle of the stator lies and the center line of the nearest stator tooth (2) is Q1, and the angle between the circle on which the point of the soft magnet (7) farthest from the outer circle of the stator lies and the center line of the nearest stator tooth (2) is Q2, wherein Q1>Q2.

18. The stator of claim 1, wherein Two soft magnets (7) are arranged in the same second yoke portion (5), and in a cross section perpendicular to the central axis of the stator core (1), the maximum stator central angle occupied by the soft magnet (7) on the magnetic flux entering side is Y2, and the maximum stator central angle occupied by the soft magnet (7) on the magnetic flux flowing out side is Y3, wherein Y2>Y3.

19. The stator of claim 1, wherein The axial height of the stator core (1) is P1, and the overall axial height of the soft magnet (7) is P2, wherein P2≥0.89*P1.

20. The stator of claim 1, wherein The cross-sectional shape of the filling groove (6) is polygonal or sector ring-shaped.

21. An electric machine comprising a stator, characterized by The stator is the stator of any one of claims 1 to 20.

22. A compressor comprising a stator, characterized by The stator is the stator of any one of claims 1 to 20.

23. The compressor of claim 22, wherein, The compressor further comprises a shell, and the single-sided interference amount of the shell with the stator is δ1, and in a cross section perpendicular to the central axis of the stator core (1), the minimum distance between the side of the soft magnet (7) close to the stator tooth (2) in the circumferential direction and the outer circle of the stator core (1) is L1, wherein L1≥19*δ1.

24. An air handling apparatus comprising a compressor, characterised in that, The compressor is the compressor of claim 22 or 23.

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