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

Abstract

The application discloses a stator lamination, a stator core, a motor, a compressor and a refrigeration device, wherein the stator lamination comprises a yoke part, a plurality of tooth parts and a plurality of recess structures; the plurality of tooth parts are arranged on the inner circumferential surface of the yoke part and are arranged at intervals along the circumferential direction of the yoke part, and a stator slot is formed between the two adjacent tooth parts; the plurality of recess structures are arranged at intervals along the outer circumferential surface of the yoke part, the recess structure comprises a first recess and two second recesses, the two second recesses are connected to the two ends of the first recess, the first recess is arranged on the yoke part corresponding to the stator slot, and the two second recesses are arranged on the yoke part corresponding to the two adjacent tooth parts respectively; in the radial direction of the yoke part, the depth of the first recess is shallower than that of the second recess, and the relationship among the maximum depth L1max of the first recess, the maximum depth L2max of the second recess and the width b of the yoke part satisfies 0.05b<=L1max<=0.4b and 0.1b<=L2max<=0.7b. The technical scheme can improve the stator fixed frequency and reduce the high-frequency carrier noise of the motor.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a stator lamination, stator core, motor, compressor and refrigeration equipment. Background Technology

[0002] Currently, most household air conditioner compressor motors use variable frequency motors. The input current of a variable frequency motor is a modulated wave, and the carrier wave of the modulated wave is a high-frequency carrier wave. When the stator lamination structure in the motor is not designed properly, it will cause the noise and vibration of the motor and compressor to deteriorate in the frequency band near the carrier wave, thereby affecting the performance of the motor and compressor, and will also seriously affect the user's auditory experience. Summary of the Invention

[0003] The main objective of this invention is to provide a stator lamination designed to improve stator frequency stability and reduce high-frequency carrier noise in motors.

[0004] To achieve the above objectives, the stator lamination proposed in this invention comprises:

[0005] yoke;

[0006] Multiple teeth are disposed on the inner circumferential surface of the yoke and are arranged at intervals along the circumferential direction of the yoke, with stator slots formed between adjacent teeth; and

[0007] Multiple recessed structures are arranged at equal intervals along the outer peripheral surface of the yoke. Each recessed structure includes a first recess and two second recesses. The two second recesses are connected to the two ends of the first recess. The first recess is located on the yoke corresponding to the stator slot, and the two second recesses are respectively located on the yoke corresponding to two adjacent teeth.

[0008] In the radial direction of the yoke, the depth of the first recess is shallower than that of the second recess, and the relationship between the maximum depth L1max of the first recess, the maximum depth L2max of the second recess, and the width b of the yoke satisfies: 0.05b≤L1max≤0.4b, 0.1b≤L2max≤0.7b.

[0009] Optionally, the recessed structure is provided with k, where k is greater than or equal to 3 and less than Q / 2, and Q is the number of stator slots.

[0010] Optionally, k equals 4.

[0011] Optionally, the number Q of the stator slots satisfies: Q≤12.

[0012] Alternatively, Q can be equal to 12.

[0013] The present invention also proposes a stator core comprising a plurality of stator laminations as described above, wherein each stator lamination is stacked along the axial direction.

[0014] The present invention also proposes an electric motor comprising a stator core as described above.

[0015] Optionally, the motor includes a cooperating stator core and a rotor, wherein the number of pole pairs p of the rotor is less than or equal to 5.

[0016] The present invention also proposes a compressor comprising the motor described above.

[0017] The present invention also proposes a refrigeration device, which includes a compressor as described above.

[0018] The technical solution of this invention involves providing multiple recessed structures on the outer peripheral surface of the yoke. These recessed structures are evenly spaced along the circumference of the yoke. Each recessed structure includes a connected first recess and two second recesses. In the radial direction of the yoke, the depth of the first recess is shallower than that of the second recesses. The relationship between the maximum depth L1max of the first recess, the maximum depth L2max of the second recess, and the width b of the yoke satisfies: 0.05b ≤ L1max ≤ 0.4b, 0.1b ≤ L2max ≤ 0.7b. This arrangement optimizes the depth of the first and second recesses within the recessed structure, thereby promoting the outer periphery of the yoke... The circumferential surface is reliably separated from the inner wall of the motor housing, which can effectively reduce electromagnetic field distortion caused by deformation and twisting of the stator laminations, as well as reduce vibration transmitted to the housing. This ensures that the natural frequency of the housing is offset from the operating frequency of the motor, effectively preventing resonance and reducing noise. Furthermore, by optimizing the magnetic circuit structure from the teeth to the yoke, the electromagnetic field flow of the yoke is guaranteed. Moreover, by reducing the magnetic force on the housing, the reaction force on the stator core composed of stator laminations is effectively reduced, improving the stability of the stator core during rotation, reducing iron loss during motor operation, and improving the performance efficiency of the motor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the stator lamination of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of parameters for each part of the middle stator lamination;

[0022] Figure 3This is a schematic diagram showing the noise comparison of the compressor of the present invention at 60 rpm;

[0023] Figure 4 This is a schematic diagram showing the noise comparison of the compressor of the present invention at 90 rpm.

[0024] Explanation of icon numbers:

[0025] label name label name 10 Yoke 30 concave structure 20 teeth 31 first recess 21 stator slot 32 second recess

[0026] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] It should be noted that if the embodiments of the present invention 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 certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this invention 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 word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. 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 invention.

[0031] This invention proposes a stator lamination.

[0032] Reference Figures 1 to 4 In this embodiment of the invention, the stator lamination includes a yoke 10, a plurality of teeth 20, and a plurality of recessed structures 30. The plurality of teeth 20 are disposed on the inner circumferential surface of the yoke 10 and are arranged at intervals along the circumferential direction of the yoke 10. A stator groove 21 is formed between adjacent teeth 20. The plurality of recessed structures 30 are arranged at equal intervals along the outer circumferential surface of the yoke 10. Each recessed structure 30 includes a first recess 31 and two second recesses 32. The two second recesses 32 are connected to both ends of the first recess 31. The first recess 31 is disposed on the yoke 10 corresponding to the stator groove 21, and the two second recesses 32 are respectively provided with… On the yoke 10 corresponding to two adjacent teeth 20; in the radial direction of the yoke 10, the depth of the first recess 31 is shallower than that of the second recess 32, and the relationship between the maximum depth L1max of the first recess 31, the maximum depth L2max of the second recess 32, and the width b of the yoke 10 satisfies: 0.05b≤L1max≤0.4b, 0.1b≤L2max≤0.7b, in millimeters. In this way, the parameters of the stator lamination can be reasonably optimized to achieve the best performance requirements, and then the high-frequency carrier noise of the motor with the stator lamination can be reduced by improving the stator fixed frequency.

[0033] The compressor includes a motor, which includes a stator core. The stator core includes multiple stacked stator laminations, which can be silicon steel sheets. Each stator lamination includes a yoke 10 and multiple teeth 20. The yoke 10 has an annular structure. The inner circumferential surface of the yoke 10 is provided with multiple teeth 20. Each tooth 20 is evenly spaced along the circumference of the yoke 10 and extends radially inward along the yoke 10. Stator slots 21 for placing winding coils are defined between adjacent teeth 20, thereby driving the rotor to rotate.

[0034] Multiple recessed structures 30 are provided on the outer peripheral surface of the yoke 10. Each recessed structure 30 is arranged at equal intervals along the circumference of the yoke 10 to ensure the structural stability of the stator laminations and facilitate rotor drive. The openings of the recessed structures 30 are oriented away from the tooth portion 20 to increase the gap between the yoke 10 and the motor housing. Each recessed structure 30 includes a first recess 31 and two second recesses 32 connected to the first recess 31 along the circumference of the yoke 10. Extending to both ends, the first recess 31 is provided on the yoke 10 corresponding to the stator slot 21, and the two second recesses 32 are respectively provided on the yoke 10 corresponding to the two adjacent teeth 20. In other words, the recessed structure 30 is provided on the outer peripheral surface of the yoke 10 connecting the two adjacent teeth 20. This arrangement helps to ensure the electromagnetic field flow of the yoke 10, improve the efficiency of the motor with the stator lamination, effectively ensure the structural strength of the stator lamination, reduce the occurrence of cracks or even breakage, extend the service life, and reduce manufacturing costs and weight.

[0035] In the radial direction of the yoke 10, the depth of the first recess 31 is shallower than that of the second recess 32, and the relationship between the maximum depth L1max of the first recess 31, the maximum depth L2max of the second recess 32, and the width b of the yoke 10 satisfies: 0.05b≤L1max≤0.4b, 0.1b≤L2max≤0.7b. Specifically, the recessed structure 30 has a dumbbell-shaped structure, that is, a structure that is deep at both ends and shallow in the middle, which facilitates processing while ensuring the electromagnetic field flow of the yoke 10. The maximum depths of the two second recesses 32 located at both ends of the first recess 31 can be the same or different, and the specific shape and structure can also be set according to the requirements. When 0.1b≤L1max≤0.4b, the specific value of L2max needs to satisfy 0.4b<L2max≤0.7b to ensure that the structure of the recessed structure 30 meets the requirement that the depth of the first recess 31 is shallower than that of the second recess 32.

[0036] When the depth of the first recess 31 is less than 0.05 times the width of the yoke 10, the gap between the first recess 31 and the motor housing is too small, causing the yoke 10 and the motor housing to be unable to separate well. Consequently, the vibration transmitted to the housing cannot be effectively reduced to avoid resonance, which can easily generate significant noise, reduce user comfort and experience, shorten the motor's service life, and reduce the motor's performance efficiency. When the depth of the first recess 31 is greater than 0.4 times the width of the yoke 10, the radial structural strength of the yoke 10 with the first recess 31 is reduced, making it prone to structural deformation, cracks, or even breakage. At the same time, due to the small radial width of the yoke 10, the magnetic circuit structure from the tooth 20 to the yoke 10 is easily saturated, reducing the magnetic flux and thus reducing the motor's performance efficiency and shortening its service life.

[0037] Similarly, when the depth of the second recess 32 is less than 0.1 times the width of the yoke 10 or greater than 0.7 times the width of the yoke 10, the gap between the yoke 10 and the motor housing is too small, making it difficult for the yoke 10 and the motor housing to separate properly. This makes it difficult to effectively reduce the vibration transmitted to the housing to avoid resonance, which can easily generate a lot of noise and reduce the comfort and experience of use. Alternatively, if the gap between the yoke 10 and the motor housing is too large, it can lead to a decrease in the structural strength of the yoke 10 and a reduction in magnetic flux, which can easily shorten the service life of the motor and reduce its performance efficiency.

[0038] Therefore, setting the relationship between the maximum depth L1max of the first recess 31 and the width b of the yoke 10 to be between 0.05 and 0.4 times the width of the yoke 10, and setting the relationship between the maximum depth L2max of the second recess 32 and the width b of the yoke 10 to be between 0.1 and 0.7 times the width of the yoke 10, helps to ensure a reasonable gap between the yoke 10 and the motor housing, so that most of the outer peripheral surface of the yoke 10 can be reliably separated from the inner wall of the motor housing. This effectively reduces the electromagnetic field distortion caused by the deformation and twisting of the stator laminations, and reduces the vibration transmitted to the housing. This causes the natural frequency of the housing to be offset from the operating frequency (stator natural frequency) of the motor, effectively avoiding resonance and reducing noise. At the same time, optimizing the magnetic circuit structure from the tooth 20 to the yoke 10, and further reducing the magnetic force on the housing, effectively reduces the reaction force on the stator core formed by the stator lamination stacking, improves the stability of the stator core during rotation, reduces iron loss during motor operation, and improves the performance efficiency of the motor.

[0039] Specifically, the maximum depth L1max of the first recess 31 can be 0.05b, 0.1b, 0.11b, 0.12b, 0.13b, 0.14b, 0.15b, 0.16b, 0.17b, 0.18b, 0.19b, 0.2b, 0.21b, 0.22b, 0.23b, 0.24, 0.25b, 0.26b, 0.27b, 0.28b, 0.29b, 0.3b, etc.; the maximum depth L2max of the second recess 32 can be 0.1b, 0.15b, 0.2b, 0.25b, 0.3b, 0.35b, 0.4b, 0.45b, 0.5b, 0.55b, 0.6b, 0.65b, 0.7b, etc.

[0040] In addition, a proper setting of the gap between the stator laminations and the motor housing can increase the flow channel for the refrigerant, ensuring reliable refrigerant flow and extending the service life of the motor.

[0041] The technical solution of this invention provides multiple recessed structures 30 on the outer peripheral surface of the yoke 10. Each recessed structure 30 is arranged at equal intervals along the circumference of the yoke 10. Each recessed structure 30 includes a connected first recess 31 and two second recesses 32. In the radial direction of the yoke 10, the depth of the first recess 31 is shallower than that of the second recesses 32. The relationship between the maximum depth L1max of the first recess 31, the maximum depth L2max of the second recess 32, and the width b of the yoke 10 satisfies: 0.05b ≤ L1max ≤ 0.4b, 0.1b ≤ L2max ≤ 0.7b. This arrangement reasonably optimizes the first recess 31 and the second recesses 32 within the recessed structure 30. The depth of 2 ensures that most of the outer peripheral surface of the yoke 10 is reliably separated from the inner wall of the motor housing. This effectively reduces electromagnetic field distortion caused by deformation and twisting of the stator laminations, as well as reduces vibration transmitted to the housing. This causes the natural frequency of the housing to be offset from the operating frequency of the motor, effectively preventing resonance and reducing noise. Furthermore, by optimizing the magnetic circuit structure from the tooth 20 to the yoke 10, the electromagnetic field of the yoke 10 is ensured to flow. The reduction in the magnetic force on the housing effectively reduces the reaction force on the stator core formed by the stacking of stator laminations, improving the stability of the stator core during rotation, reducing iron loss during motor operation, and improving the performance efficiency of the motor.

[0042] Optionally, in one embodiment, the recessed structure 30 is provided with k, where k is greater than or equal to 3 and less than Q / 2, and Q is the number of stator slots 21. Specifically, when the number of recessed structures 30 is less than 3, most of the outer peripheral surface of the yoke 10 is connected to the motor housing, resulting in greater vibration transmitted to the housing. This makes it impossible to separate the natural frequency of the housing from the operating frequency of the motor. Furthermore, the gap between the yoke 10 and the housing is small, making resonance highly likely. This leads to poor heat dissipation, increased noise, shortened motor lifespan, reduced motor performance efficiency, and a lower user experience. When the number of recessed structures 30 is greater than half the number of stator slots 21, it easily affects the structural stability of the stator laminations, thereby affecting the stability of the motor during operation, reducing motor performance efficiency, increasing noise, and lowering the user experience. Therefore, setting the number of recessed structures 30 between 3 and Q / 2 allows for reliable separation of most of the outer peripheral surface of the yoke 10 from the inner wall of the motor housing. This reduces vibration transmitted to the housing, effectively prevents resonance, and lowers noise. Simultaneously, it optimizes the magnetic circuit structure from the toothed section 20 to the yoke 10, improving the stability of the stator core during rotation, reducing iron losses during motor operation, and increasing motor performance efficiency. Specifically, when Q is less than or equal to 12, the number of recessed structures 30 can be 3 or 4. Figure 1 The number of recessed structures 30 on the stator lamination shown is 4.

[0043] Specifically, in one embodiment, k equals 4, that is, there are 4 recessed structures 30 on the stator lamination. The 4 recessed structures 30 are arranged along the outer peripheral surface of the yoke 10 so that most of the outer peripheral surface of the yoke 10 can be reliably separated from the inner wall of the motor housing, thereby improving the performance efficiency of the motor.

[0044] Optionally, in one embodiment, the number Q of the stator slots 21 satisfies: Q ≤ 12; wherein the number of stator slots 21 can be selected according to actual needs. Specifically, Q equals 12.

[0045] This invention also proposes a stator core comprising multiple stator laminations. The specific structure of the stator laminations is as described in the above embodiments. Since this stator core adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The stator laminations are stacked axially to reduce iron loss during the operation of the motor equipped with this stator core.

[0046] The present invention also proposes an electric motor, which includes a stator core. The specific structure of the stator core is as described in the above embodiments. Since the present 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.

[0047] Specifically, the motor includes a stator core and a rotor that cooperate with each other. The number of pole pairs p of the rotor is less than or equal to 5, that is, the number of poles can be 4, 6, 8, etc. When the number of stator slots Q is 12, the motor can be a 12-slot 8-pole motor.

[0048] This invention also proposes a compressor including a motor, the specific structure of which is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. Specifically, based on the limitations of the stator lamination parameters in the motor, the noise level of the compressor in this application at 60 rpm is compared with that of the comparative model. Figure 3 As shown, the noise level at 90 rpm is compared with that of the comparison model. Figure 4 As shown, it is clear that the performance of the compressor in this application is significantly better than that of the comparative models.

[0049] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor is as described in the above embodiments. Since the 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.

[0050] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator lamination, characterized in that, include: yoke; Multiple teeth are provided on the inner circumferential surface of the yoke and are arranged at intervals along the circumferential direction of the yoke, and a stator groove is formed between two adjacent teeth; as well as Multiple recessed structures are arranged at equal intervals along the outer peripheral surface of the yoke. Each recessed structure includes a first recess and two second recesses. The two second recesses are connected to the two ends of the first recess. The first recess is located on the yoke corresponding to the stator slot, and the two second recesses are respectively located on the yoke corresponding to two adjacent teeth. In the radial direction of the yoke, the depth of the first recess is shallower than that of the second recess, and the relationship between the maximum depth L1max of the first recess, the maximum depth L2max of the second recess, and the width b of the yoke satisfies: 0.05b≤L1max≤0.4b, 0.1b≤L2max≤0.7b.

2. The stator lamination as described in claim 1, characterized in that, The recessed structure is provided with k, where k is greater than or equal to 3 and less than Q / 2, and Q is the number of stator slots.

3. The stator lamination as described in claim 2, characterized in that, k equals 4.

4. The stator lamination as described in claim 1, characterized in that, The number of stator slots Q satisfies: Q≤12.

5. The stator lamination as described in claim 4, characterized in that, Q equals 12.

6. A stator core, characterized in that, It includes a plurality of stator laminations as described in any one of claims 1 to 5, wherein each stator lamination is stacked along the axial direction.

7. An electric motor, characterized in that, Including the stator core as described in claim 6.

8. The motor as described in claim 7, characterized in that, The motor includes a stator core and a rotor that cooperate with each other, wherein the number of pole pairs p of the rotor is less than or equal to 5.

9. A compressor, characterized in that, Includes the motor as described in any one of claims 7 to 8.

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

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