Stator, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a stator, a motor, a compressor and refrigeration equipment, and relates to the technical field of permanent magnet motors for compressors, and the stator comprises a stator iron core; the stator core comprises a yoke part and a plurality of stator teeth which are distributed along the inner circumference of the yoke part at intervals, the adjacent stator teeth form stator slots at intervals, the stator slots form stator notches in the inner circumference of the stator core, and one side, far away from the yoke part, of each stator tooth shrinks inwards at the corner part adjacent to one stator notch to form a concave part; wherein the corresponding central angle of the stator teeth at the circle center of the stator core is a, the corresponding central angle of the concave parts at the circle center of the stator core is a1, and a1 is larger than or equal to 0.2 * a and smaller than or equal to 0.5 * a. According to the technical scheme provided by the utility model, the air gap flux density harmonic content is reduced, the iron loss is reduced, and the efficiency of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology for compressors, and in particular to a stator, motor, compressor and refrigeration equipment. Background Technology

[0002] Improving motor efficiency can enhance the energy efficiency of various motor applications, leading to a better user experience. Common technologies to improve efficiency include using thicker permanent magnets or increasing heat dissipation. However, these methods increase the motor's size, and their effectiveness in improving efficiency is limited, especially at high speeds, thus impacting the user experience. Utility Model Content

[0003] The main purpose of this invention is to provide a stator, motor, compressor, and refrigeration equipment that aims to reduce the harmonic content of the air gap magnetic flux density and reduce iron loss, thereby improving the efficiency of the motor.

[0004] To achieve the above objectives, the stator proposed in this utility model includes:

[0005] A stator core, the stator core including a yoke and a plurality of stator teeth spaced apart along the inner circumference of the yoke, adjacent stator teeth spaced apart to form stator slots, the stator slots forming stator slot openings on the inner circumference of the stator core, and the side of the stator teeth away from the yoke forming a recessed portion at the corner adjacent to a stator slot opening.

[0006] Wherein, the central angle corresponding to the center of the stator tooth at the center of the stator core is a, and the central angle corresponding to the recess at the center of the stator core is a1, satisfying: 0.2×a≤a1≤0.5×a.

[0007] In one embodiment, the stator tooth forms a chamfer corresponding to the recess, and the angle between the chamfer and the chord perpendicular to the radius of the corresponding stator tooth is b, satisfying: 15°≤b≤45°.

[0008] In one embodiment, the minimum width of the stator slot along the circumference of the stator core is BS0, and the width of the stator tooth along the circumference of the stator core is Bt, satisfying: 2.3mm≤BS0≤Bt.

[0009] In one embodiment, the maximum outer diameter of the stator is D1, and the minimum inner diameter of the stator is D2, satisfying: 0.47≤D2 / D1≤0.6.

[0010] In one embodiment, the minimum inner diameter of the stator is D2, which satisfies: 48mm≤D2≤56mm.

[0011] In one embodiment, the number of recesses is K, satisfying: K≤Q, and each stator tooth is provided with at most one recess.

[0012] In one embodiment, the number of stator teeth is Q, which satisfies: a = 300° / Q.

[0013] This utility model also proposes an electric motor, including the stator as described above.

[0014] In one embodiment, the motor further includes a rotor rotatably disposed on the inner circumference of the stator. The rotor has a plurality of permanent magnets distributed in the circumferential direction. On the axial projection plane of the rotor, the thickness of the permanent magnets is Hm, satisfying: 1.2mm≤Hm≤3.5mm.

[0015] This utility model also proposes a compressor, including the stator as described above or the motor as described above.

[0016] This utility model also proposes a refrigeration device, including a motor as described above, or a compressor as described above.

[0017] The technical solution of this utility model involves distributing multiple stator teeth on the inner circumference of the yoke, with adjacent stator teeth forming stator slots. These slots penetrate the inner circumference of the stator core to form slot openings. On one side of the inner circumference of the stator core, the corners of the stator teeth near the slot openings recede towards the yoke, forming recesses. Based on a structure without recesses in the stator teeth, and with the center of the stator core as the center, the ratio of the central angle α1 occupied by the recess to the central angle α occupied by the stator teeth is defined to be between 0.2 and 0.5. This makes the shape of the stator teeth near the slot openings smoother, resulting in a more gradual change in air gap permeability and reducing harmonics caused by abrupt changes in permeability. Simultaneously, the recesses form local magnetic reluctance barriers on the stator teeth, hindering the closure of harmonic flux, thereby reducing the harmonic content in the air gap magnetic flux density. Correspondingly, the frequency components and amplitude of the alternating magnetic field in the stator core are reduced, thus reducing motor iron losses and improving the overall efficiency of the motor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of an embodiment of the stator provided by this utility model;

[0020] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 A schematic diagram of another embodiment of the stator provided by this utility model;

[0022] Figure 4 A schematic diagram of another embodiment of the stator provided by this utility model;

[0023] Figure 5 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0024] Figure 6 A schematic diagram of another embodiment of the motor provided by this utility model;

[0025] Figure 7 A schematic diagram of another embodiment of the motor provided by this utility model;

[0026] Figure 8 for Figure 5 A schematic diagram showing the relationship between the central angle a1 of the concave section and the harmonic content of the air gap magnetic flux density;

[0027] Figure 9 for Figure 5 A schematic diagram showing the relationship between the efficiency of the electric motor at 3600 rpm and the angle b of the recess;

[0028] Figure 10 A schematic diagram of a compressor embodiment provided by this utility model.

[0029] Explanation of icon numbers:

[0030] 100. Stator core; 110. Yoke; 120. Stator slot; 121. Stator slot opening; 130. Stator tooth; 131. Recess; 132. Chamfer;

[0031] 200, Rotor; 210, Permanent magnet slot; 220, Permanent magnet; 230, Rivet hole; 240, Rotor shaft hole; 250, Flow hole; 300, Pump body; 400, Liquid storage tank.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a stator.

[0037] Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 8 In one embodiment of this utility model, the stator includes:

[0038] The stator core 100 includes a yoke 110 and a plurality of stator teeth 130 spaced apart along the inner circumference of the yoke 110. Adjacent stator teeth 130 form stator slots 120 at intervals. The stator slots 120 form stator slot openings 121 on the inner circumference of the stator core 100. The side of the stator teeth 130 away from the yoke 110 is recessed at the corner adjacent to the stator slot opening 121 to form a recess 131.

[0039] Among them, the central angle corresponding to the center of the stator tooth 130 at the center of the stator core 100 is a, the central angle corresponding to the center of the recess 131 at the center of the stator core 100 is a1, and the number of stator teeth 130 is Q, which satisfies: 0.2×a≤a1≤0.5×a, a=300° / Q.

[0040] The technical solution of this utility model involves distributing multiple stator teeth 130 on the inner circumference of the yoke 110. Two adjacent stator teeth 130 form a stator slot 120, which penetrates the inner circumference of the stator core 100 to form a stator slot opening 121. On one side of the inner circumference of the stator core 100, the corner of the stator tooth 130 near the stator slot opening 121 retracts towards the yoke 110, forming a recess 131. Based on the structure of the stator tooth 130 without the recess 131, and taking the center of the stator core 100 as the center, the central angle α1 occupied by the recess 131 is defined. The ratio of the central angle α occupied by the stator tooth 130 is between 0.2 and 0.5, which makes the shape of the stator tooth 130 near the stator slot 121 smoother, making the change in air gap magnetic permeability more gradual and reducing harmonics caused by abrupt changes in magnetic permeability. At the same time, the recess 131 forms a local magnetic reluctance barrier in the stator tooth 130, thereby hindering the closure of harmonic magnetic flux and reducing the harmonic content in the air gap magnetic flux density. Correspondingly, the frequency components and amplitude of the alternating magnetic field in the stator core 100 are reduced accordingly, thereby reducing the iron loss of the motor and improving the overall efficiency of the motor.

[0041] It should be noted that the central angle α corresponding to the stator tooth 130 in the circumferential direction of the stator core 100, and the central angle α1 corresponding to the recess 131 in the circumferential direction of the stator core 100, are both defined as the side of the aforementioned central angles when the stator tooth 130 does not have the recess 131. After the stator tooth 130 is provided with the recess 131, as... Figure 2 As shown, the side with the aforementioned angle does not intersect with the stator tooth 130, but rather passes through the stator slot 121 adjacent to the recess 131. This is because after the corner of the stator tooth 130 retracts towards the yoke 110 to form the recess 131, a gap is formed between it and the stator tooth 130. Regarding the range of values ​​for the central angle α1 of the recess 131 at the center of the stator core 100, as follows... Figure 8As shown, when the value of a1 is in the range of 0.2a to 0.5a, the air gap magnetic flux density harmonic content is close to 15%. Correspondingly, when the value of a1 is in the range of 0.5a to a, although the air gap magnetic flux density harmonic content is also close to 15%, the recessed portion 131 occupies an excessively large proportion of the stator teeth 130 within this range, increasing the difficulty of the stator winding binding and winding process, and causing difficulties in fixing the stator winding. Therefore, setting the value of a1 between 0.2a and 0.5a not only reduces the air gap magnetic flux density harmonic content and reduces iron loss to improve motor efficiency, but also avoids interference with the stator winding binding and winding process, ensuring the convenience and operability of stator assembly. Here, a1 can be 0.2a, 0.3a, 0.4a, or 0.5a, etc.

[0042] Without loss of generality, regarding the shape of the recess 131, the recess 131 can form a regular triangular space on the stator tooth 130, so that the stator tooth 130 presents a triangular block shape at the corner adjacent to the stator slot 121, that is, the stator tooth 130 has a straight side corresponding to the recess 131. Alternatively, the recess 131 can also be a fan-shaped space on the stator tooth 130 that retracts towards the yoke 110, so that the stator tooth 130 has a concave arc side corresponding to the recess 131. Alternatively, the stator tooth 130 has a convex arc side corresponding to the recess 131. Of course, it can also be a broken line side. Here, the recess dimension of the recess 131 on the stator core 100 is expressed as: the distance between the intersection of the recess 131 and the stator tooth 130 on the inner circumference of the stator core 100 and the intersection with the stator slot 121. In the technical solution of this embodiment, as Figure 1 , Figure 3 and Figure 4 As shown, a stator tooth 130 is provided with a recess 131, that is, the stator tooth 130 is not adjusted at the other corner of the inner circumference of the stator core 100. For multiple stator teeth 130 with recesses 131, the stator teeth 130 with recesses 131 are evenly distributed in the circumferential direction of the stator core 100. Furthermore, with reference to the rotation direction of the rotor 200 corresponding to the stator, the recesses 131 are located in front of the stator teeth 130 along the circumferential direction of the stator core 100.

[0043] In one embodiment, please refer to Figure 1 and Figure 2For the central angle α of the stator tooth 130 at the center of the stator core 100, the number of stator teeth 130 is Q, satisfying: a = 300° / Q. It can be understood that 300° as the numerator represents the elimination of the angular influence of the stator slot 121, and also limits the stator specification to a ratio where the central angle occupied by the stator slot 121 is 60°. This allows the air gap magnetic flux density distribution to more closely approximate a sine wave, reducing higher harmonics caused by abrupt changes in magnetic permeability, effectively reducing the harmonic content of the air gap magnetic flux density, thereby reducing iron loss and improving motor efficiency. Of course, in other embodiments, the value of α can be adaptively adjusted according to different motor specifications, and is not limited to the case where 300° is the numerator.

[0044] Regarding the radial dimension of the recess 131 in the stator core 100, in one embodiment, please refer to... Figure 1 and Figure 2 The stator tooth 130 forms a chamfer 132 corresponding to the recess 131. The angle between the chamfer 132 and the chord perpendicular to the radius of the corresponding stator tooth 130 is b, satisfying: 15°≤b≤45°. It should be noted that the radius of the stator tooth 130 is defined as the radius corresponding to the center of the stator tooth 130 along the circumference of the stator core 100. The chord perpendicular to this radius is parallel to the tangent line at the center of the stator tooth 130 along the circumference of the stator core 100. Furthermore, the chamfer 132 can be a straight line, a curve, or a broken line. Regarding the angle b between the chamfer 132 and the aforementioned chord, the straight line of the chamfer 132 is defined as the line connecting the intersection point of the recess 131 on the inner circumference of the stator core 100 and the stator tooth 130, and the intersection point of the recess 131 and the stator slot 121. Therefore, please refer to Figure 9 When b is 15°, the motor efficiency at 3600 rpm increases to 92.3%. When b is 45°, the motor efficiency at 3600 rpm remains at 92.3%. Furthermore, when b is within the range of 15° to 45°, the motor exhibits stable and good efficiency. When b is less than 15°, the radial dimension of the recess 131 is small, which not only affects the winding process but also weakens the magnetic reluctance barrier formed by the recess 131. When b is greater than 45°, the radial dimension of the recess 131 is large, resulting in an excessively large magnetic reluctance barrier, thus affecting the motor efficiency. Here, b can be 45°, 30°, 22.5°, or 15°, etc. Of course, in other embodiments, b can be limited to less than 15° or greater than 45° depending on the motor specifications and the environment.

[0045] In one embodiment, please refer to Figure 1 and Figure 2The minimum circumferential width of the stator slot 121 along the stator core 100 is BS0, and the circumferential width of the stator tooth 130 in the stator core 100 is Bt, satisfying: 2.3mm≤BS0≤Bt. It should be noted that the axial width Bt of the stator tooth 130 in the stator core 100 is located radially, at the center of the stator tooth 130 along the circumferential width of the stator core 100. The minimum circumferential width BS0 of the stator slot 121 along the stator core 100 is determined based on the shape of the recessed portion 131 of the stator tooth 130. Thus, when the minimum circumferential width of the stator slot 121 is greater than or equal to 2.3 mm, it provides basic space for winding, ensuring that the winding can be smoothly wound within the stator slot 120. Meanwhile, limiting BS0 to Bt restricts excessive expansion of the stator slot 121, ensuring that the stator teeth 130 maintain sufficient strength and magnetic permeability. This helps maintain the normal distribution of the magnetic field and reduces iron losses caused by magnetic field distortion. Furthermore, a BS0 greater than or equal to 2.3 mm provides sufficient space for heat dissipation in the windings, facilitating airflow near the stator slot 121 and carrying away heat generated by the windings, thereby indirectly reducing copper losses. This reduces the total motor losses and improves motor efficiency.

[0046] Specifically, in one embodiment, based on the above technical solution, when a1 = 6°, b = 13°, BS0 = 2.5mm and the rotor 200 iron core stack thickness L = 40mm, the air gap magnetic flux density harmonics are reduced by 14% and the motor efficiency is increased by 0.3% while meeting the stator winding requirements.

[0047] In one embodiment, please refer to Figure 1 , Figure 3 and Figure 4 The stator has a maximum outer diameter of D1 and a minimum inner diameter of D2, satisfying the condition: 0.47 ≤ D2 / D1 ≤ 0.6. It can be understood that when D2 / D1 is between 0.47 and 0.6, the ratio of the stator's inner and outer diameters is more suitable, resulting in a more uniform magnetic field distribution within the stator. This helps reduce magnetic field distortion and abrupt changes, thereby reducing the air gap magnetic flux density harmonic content, ultimately reducing iron losses and improving motor efficiency. The value of D2 / D1 can be 0.47, 0.49, 0.53, 0.55, 0.58, or 0.6, etc. Of course, in other embodiments, D2 / D1 can be limited to be greater than 0.6 or less than 0.47 depending on the motor specifications.

[0048] Regarding the dimensions of the stator, in one embodiment, please refer to... Figure 1 , Figure 3 and Figure 4The minimum inner diameter of the stator is D2, satisfying: 48mm ≤ D2 ≤ 56mm. It can be understood that with this minimum inner diameter D2, the motor is configured as a small-sized motor, the magnetic field generated by the permanent magnets 220 within the rotor 200 is uniformly distributed, and the stator teeth 130 can effectively achieve magnetic conductivity, helping to maintain the normal distribution of the magnetic field, reducing iron losses caused by magnetic field distortion. Furthermore, with this minimum inner diameter D2, the stability of the air gap magnetic flux density can be ensured, thereby improving motor efficiency. The value of D2 can be 48mm, 50mm, 51mm, 53mm, 55mm, or 56mm. Of course, in other embodiments, depending on the application scenario, the dimension of D2 can be limited to be greater than 56mm or less than 48mm.

[0049] In one embodiment, please refer to Figure 1 , Figure 3 and Figure 4 The number of recesses 131 is K, and the number of stator teeth 130 is Q, satisfying: K ≤ Q, and each stator tooth 130 can have at most one recess 131. It should be noted that having one recess 131 per stator tooth 130, compared to having two or more recesses 131, reduces interference with the magnetic circuit of the stator tooth 130, resulting in a more uniform magnetic field distribution, reduced magnetic field distortion, and thus reduced air gap magnetic flux density harmonic content, improving the electromagnetic performance of the motor. Simultaneously, a reasonable stator structure also helps reduce copper losses and improve motor efficiency. For example, Figure 1 and Figure 5 As shown, Q equals K; Figure 3 and Figure 6 As shown, Q / 2 equals K; Figure 4 and Figure 7 As shown, Q / 4 equals K.

[0050] This utility model also proposes an electric motor, which includes a stator. The specific structure of the stator is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all 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 described in detail here.

[0051] The rotor 200 has multiple permanent magnet slots 210 distributed circumferentially, and a permanent magnet 220 is installed in one permanent magnet slot 210. The rotor core 200 is formed by stacking multiple rotor laminations along the axial direction of the rotor 200, and the stator core 100 is formed by stacking multiple stator laminations along the axial direction of the stator. It can be understood that the stator laminations and rotor laminations are formed through a high-speed stamping process to ensure the structural stability of the rotor laminations and stator laminations, thereby ensuring the stability of the rotor 200 during high-speed, heavy-load operation. The rotor laminations can be connected to form the rotor 200, and the stator laminations can be connected to form the stator, either by welding or riveting. For riveting, whether multiple rotor laminations are riveted to form the rotor core 200 or multiple stator laminations are riveted to form the stator core 100, it can be done by using rivets, or by setting rivet points on the rotor laminations or stator laminations to ensure stable riveting between adjacent rotor laminations or adjacent stator laminations.

[0052] In one embodiment, such as Figures 5 to 7 As shown, the rotor laminations are provided with rivet holes 230. These rivet holes 230 are used to stack multiple rotor laminations by riveting to form the rotor 200 core, ensuring the structural stability of the rotor 200 core. Without loss of generality, a rotor shaft hole 240 is provided in the middle of the rotor 200 core. A rotating shaft passes through the rotor shaft hole 240. Utilizing the kinematic cooperation between the rotor 200 and the stator, the motor can output power externally through the rotating shaft in the rotor shaft hole 240. It can be understood that the rotor shaft hole 240 and the rotating shaft remain stable at least in the circumferential direction of the rotor 200. It is understood that, for the stator that cooperates with the rotor 200, in this embodiment, the motor is configured as an internal rotor 200 motor, with a mounting hole formed in the center of the stator, through which the rotor 200 rotatably passes.

[0053] In one embodiment, please refer to Figures 5 to 7The rotor 200 is rotatably mounted on the inner circumference of the stator. Multiple permanent magnets 220 are distributed circumferentially on the rotor 200. On the axial projection plane of the rotor 200, the thickness of the permanent magnets 220 is Hm, satisfying: 1.2mm ≤ Hm ≤ 3.5mm. It should be noted that the thickness Hm of the permanent magnets 220 represents the width of the permanent magnets 220 on the axial projection plane of the rotor 200, and also the magnetization direction of the permanent magnets 220. Limiting Hm to between 1.2mm and 3.5mm allows the permanent magnets 220 to generate a suitable magnetic field strength, resulting in a more rational magnetic field distribution within the motor, thereby improving magnetic field utilization and enabling the magnetic field to act more effectively on the stator windings, enhancing the motor's torque output capability. Furthermore, a rational magnetic field distribution and improved magnetic field utilization reduce magnetic field distortion and leakage, thus reducing iron losses and improving motor efficiency. Hm can be 1.2mm, 1.5mm, 2.2mm, 2.6mm, 3.0mm, or 3.5mm. Of course, in other embodiments, permanent magnets 220 with Hm greater than 3.5mm or less than 1.2mm can be selected according to the specifications of the motor.

[0054] This utility model also proposes a compressor, which includes a stator or a motor. The specific structure of the stator or motor is as described in the above embodiments. Since this compressor adopts all the technical solutions of all 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 described in detail here.

[0055] In one embodiment, please refer to Figures 5 to 7 The rotor 200 is provided with flow holes 250, through which the refrigerant in the compressor and the lubricating oil rotating on the rotor 200 are disposed together. A circulation is formed through the flow holes 250 on the rotor 200, the gap between the stator and the compressor housing, and the air gap between the stator and the rotor 200. This can cool the motor and reduce the impact of eddy current losses on motor efficiency. Alternatively, the motor housing and the compressor housing can be configured as a single component to reduce the number of components within the compressor, improving its compactness and reducing its size. Of course, in other embodiments, the motor can also be assembled and then installed on the compressor, presenting the motor with its own motor housing.

[0056] Regarding the structure of the compressor, such as Figure 10As shown, the compressor contains a rotor 200 and a stator, with a pump body 300 positioned below them. This pump body 300 pumps both refrigerant and lubricating oil from the compressor towards the rotor 200. The circulation of lubricating oil and the separation of refrigerant and lubricating oil into the refrigerant circuit are achieved through the flow holes 250 on the rotor 200 core and the gap between the stator and the casing, thus reducing the compressor's size. Correspondingly, the compressor also includes a liquid receiver 400. The liquid receiver 400 balances the refrigerant circulation volume under different operating conditions, ensuring stable operation of the evaporator and condenser, and preventing incompletely evaporated liquid refrigerant from entering the compressor, thus avoiding liquid slugging damage to compressor components.

[0057] This utility model also proposes a refrigeration device, which includes a motor or a compressor. The specific structure of the motor or compressor is as described in the above embodiments. Since this refrigeration device adopts all the technical solutions of all 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 described in detail here. The refrigeration device can be configured as a refrigerator, air conditioner, etc.

[0058] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A stator, characterized in that, include: A stator core, the stator core including a yoke and a plurality of stator teeth spaced apart along the inner circumference of the yoke, adjacent stator teeth spaced apart to form stator slots, the stator slots forming stator slot openings on the inner circumference of the stator core, and the side of the stator teeth away from the yoke forming a recessed portion at the corner adjacent to a stator slot opening. Wherein, the central angle corresponding to the center of the stator tooth at the center of the stator core is a, and the central angle corresponding to the recess at the center of the stator core is a1, satisfying: 0.2×a≤a1≤0.5×a.

2. The stator as described in claim 1, characterized in that, The stator teeth form a chamfered edge corresponding to the recessed portion, and the angle between the chamfered edge and the chord perpendicular to the radius of the corresponding stator teeth is b, satisfying: 15°≤b≤45°.

3. The stator as described in claim 1, characterized in that, The minimum width of the stator slot along the circumference of the stator core is BS0, and the width of the stator tooth along the circumference of the stator core is Bt, satisfying: 2.3mm≤BS0≤Bt.

4. The stator as described in claim 1, characterized in that, The maximum outer diameter of the stator is D1, and the minimum inner diameter of the stator is D2, satisfying: 0.47≤D2 / D1≤0.

6.

5. The stator as described in claim 1, characterized in that, The minimum inner diameter of the stator is D2, which satisfies: 48mm≤D2≤56mm.

6. The stator as described in any one of claims 1 to 5, characterized in that, The number of recesses is K, and the number of stator teeth is Q, satisfying: K≤Q, and each stator tooth is provided with at most one recess; And / or, the number of stator teeth is Q, satisfying: a = 300° / Q.

7. An electric motor, characterized in that, Includes the stator as described in any one of claims 1 to 6.

8. The motor as described in claim 7, characterized in that, The motor also includes a rotor, which is rotatably disposed on the inner circumference of the stator. The rotor has a plurality of permanent magnets distributed in the circumferential direction. On the axial projection plane of the rotor, the thickness of the permanent magnet is Hm, which satisfies: 1.2mm≤Hm≤3.5mm.

9. A compressor, characterized in that, Includes a stator as described in any one of claims 1 to 6, or an electric motor as described in claim 7 or 8.

10. A refrigeration device, characterized in that, This includes the motor as described in claim 7, or the compressor as described in claim 9.

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