Stator assembly, motor, compressor and refrigeration equipment

Abstract

The invention discloses a stator assembly, a motor, a compressor and refrigeration equipment, the stator assembly comprises a stator yoke part and a plurality of stator tooth parts arranged along the circumferential direction of the stator yoke part, each stator tooth part comprises a stator tooth root connected with the stator yoke part and a stator tooth top located at the end part of the stator tooth root, the inner edge of the stator tooth crest is provided with a tooth crest notch facing the center of the stator yoke part, the maximum distance from the tooth crest notch to the center of the stator yoke part is r1, the distance from the outer edge of the stator yoke part to the center of the stator yoke part is D1, the minimum distance from the stator tooth crest to the center of the stator yoke part is D2, 1 < 2 * r1 / D2 < = 1.04, and 0.583 < = D2 / D1 < = 0.610. According to the technical scheme, the vibration and noise of the motor are reduced by optimizing the size parameters of the motor.

Description

Technical Field

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

[0002] As a core component of refrigeration equipment like refrigerators and air conditioners, the compressor performs the crucial task of compressing the refrigerant in the refrigeration cycle. The motor, in turn, is the compressor's power source, providing a continuous supply of energy to keep it running. The motor's vibration and noise levels directly impact the overall vibration and noise performance of refrigeration equipment like refrigerators and air conditioners. In this context, consumers are no longer solely focused on price when purchasing home appliances, especially refrigeration equipment like air conditioners and refrigerators. They are increasingly prioritizing product performance and user experience. Among these factors, noise levels in refrigeration equipment are becoming a key consideration for consumers. Summary of the Invention

[0003] The main purpose of the present invention is to provide a stator assembly, which aims to reduce the vibration and noise of the motor by optimizing the size parameters of the motor.

[0004] To achieve the above objectives, the present invention provides a stator assembly comprising: a stator yoke and a plurality of stator teeth arranged circumferentially along the stator yoke, the stator teeth comprising a stator tooth root connected to the stator yoke and a stator tooth top located at the end of the stator tooth root, the inner edge of the stator tooth top being provided with a tooth top notch facing the center of the stator yoke, the maximum distance from the tooth top notch to the center of the stator yoke being r1, the distance from the outer edge of the stator yoke to its center being D1, and the minimum distance from the stator tooth top to the center of the stator yoke being D2;

[0005] Among them, r1 and D2 satisfy the relationship: 1<2*r1 / D2≤1.04;

[0006] Moreover, D1 and D2 satisfy the relationship: 0.583≤D2 / D1≤0.610.

[0007] Optionally, in the rotation direction of the stator assembly, two endpoints of the inner edge of the stator tooth top are the first endpoint and the second endpoint respectively, and the tooth top notch is arranged closer to the first endpoint than to the second endpoint.

[0008] Optionally, the point with the maximum distance from the tooth top notch to the center of the stator yoke is the notch apex, and in the circumferential direction of the stator assembly, the distance from the notch apex to the first end point is d1, and the distance from the tooth mouth apex to the second end point is d2, and d1<d2.

[0009] Optionally, the distance from the first end point to the center of the stator yoke is r2, and the distance from the second end point to the center of the stator yoke is r3, where r2=r3=D2 / 2.

[0010] Optionally, a stator slot is defined between two adjacent stator teeth, the number of the stator slots is Z, the number of poles of the motor is P, and Z / P=3 / 2 or Z / P=6 / 5.

[0011] Optionally, the rotor assembly matched with the stator assembly includes an electromagnet, the residual magnetism of the electromagnet is B r , the width of the stator tooth root is t, 10≤D2*B r / t≤14.

[0012] Optionally, the contour line of the tooth top notch is arc-shaped or broken line-shaped.

[0013] The present invention also provides a motor comprising the stator assembly as described above.

[0014] The present invention also provides a compressor comprising the motor as described above.

[0015] The present invention also provides a refrigeration device comprising the compressor as described above.

[0016] The technical solutions D1 and D2 of the present invention satisfy the relationship: 0.583≤D2 / D1≤0.610, ensuring the machining and assembly precision of the stator assembly, improving the quality after assembly, and reducing machining and production costs. The inner edge of the stator tooth top is provided with a tooth top notch facing the center of the stator yoke. The maximum distance from the tooth top notch to the center of the stator yoke is r1, and the minimum distance from the stator tooth top to the center of the stator yoke is D2, where 1<2*r1 / D2≤1.04. By controlling the three-phase fundamental frequency synthetic magnetic potential, while ensuring that the fundamental wave remains unchanged, the high-frequency harmonic pulsating magnetic potential is reduced, thereby reducing the vibration and noise generated by the motor. Rationally setting the relationship between the tooth top notch distance r1 and D2 can effectively weaken the occurrence of high-frequency vibration. When the ratio of the minimum distance from the stator tooth tip to the center of the stator yoke is between 1 and 1.04, the generation of high-frequency vibrations can be limited, reducing their impact on the overall system, reducing the possibility of vibration and noise, reducing friction and collisions within the motor, and improving the motor's stability and operating efficiency, thereby improving the overall performance of the refrigeration equipment. This optimized design can make the refrigeration equipment quieter and more stable, enhance the user experience, and extend the equipment's lifespan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of a stator assembly of a motor according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of an embodiment of a middle stator tooth portion;

[0020] Figure 3 for Figure 1 A partial enlarged view of another embodiment of the middle stator teeth.

[0021] Description of Figure Numbers:

[0022] Label name Label name 100 stator assembly 141 Tooth tip notch 110 stator yoke 142 First endpoint 120 stator teeth 143 Second endpoint 130 stator tooth root 144 inner edge 140 stator tooth top 150 stator slots

[0023] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] With the rapid progress of society and the sustained development of the economy, people's quality of life has been unprecedentedly improved. Against this backdrop, consumers are no longer solely concerned with price when purchasing home appliances, especially cooling equipment like air conditioners and refrigerators. They are now placing greater emphasis on product performance and user experience, rather than simply considering price. Among these factors, the noise level of cooling equipment has gradually become a key consideration for consumers.

[0028] As a core component in refrigeration equipment like refrigerators and air conditioners, the compressor performs the crucial task of compressing the refrigerant in the refrigeration cycle. The motor, on the other hand, is the compressor's power source, providing a continuous supply of energy for its operation. The motor's vibration and noise levels directly impact the overall vibration and noise performance of refrigeration equipment like refrigerators and air conditioners.

[0029] Motor vibrations primarily stem from factors such as imbalanced operation within the motor's internal structure, friction between mechanical components, and electromagnetic forces. These vibrations not only reduce the stability of the device itself but can also be transmitted through the device's casing to the surrounding environment. Motor noise, on the other hand, primarily comes from electromagnetic noise, mechanical noise, and airflow noise. Electromagnetic noise is caused by variations in the motor's internal electromagnetic field, mechanical noise is generated by friction and vibration within the motor's rotating components, and airflow noise is related to the flow of air inside and outside the motor.

[0030] Optimizing the design of the motor and reducing the friction and imbalance of the internal structure can significantly reduce the harmonic electromagnetic force of the motor and reduce the vibration and noise of the compressor; using advanced materials and technologies to improve the operating efficiency of the motor can significantly reduce the vibration and noise of the compressor; for example, adding sound insulation materials to the motor casing can reduce the spread of noise.

[0031] In order to reduce the vibration and noise of a motor, the present invention proposes a motor, aiming to reduce the vibration and noise of the motor by optimizing the size parameters of the motor.

[0032] Reference Figures 1 to 3 In one embodiment of the present invention, the motor includes a rotor assembly and a stator assembly 100, wherein the stator assembly 100 cooperates with the rotor assembly.

[0033] The stator assembly 100 includes a stator yoke 110 and a plurality of stator teeth 120 arranged circumferentially along the stator yoke 110. The stator tooth 120 includes a stator tooth root 130 connected to the stator yoke 110 and a stator tooth top 140 located at the end of the stator tooth root 130. The inner edge 144 of the stator tooth top 140 is provided with a tooth top notch 141 facing the center of the stator yoke 110. The maximum distance from the tooth top notch 141 to the center of the stator yoke 110 is r1, and the minimum distance from the stator tooth top 140 to the center of the stator yoke 110 is D2, 1<2*r1 / D2≤1.04.

[0034] The minimum distance from the stator tooth top 140 to the center of the stator yoke 110 is D2, that is, the inner diameter D2 of the stator assembly 100, which is the distance from the point of the stator tooth top 140 closest to the stator rotation center to the stator rotation center; the distance from the outer edge of the stator yoke 110 to its center is D1, that is, the outer diameter D1 of the stator assembly 100.

[0035] The core structure of the motor is primarily composed of a rotor assembly and a stator assembly 100. These two components work together to enable the motor to operate normally and output power. The rotor assembly is the rotating portion of the motor and is typically composed of a rotor core, rotor windings, and a rotor shaft. The rotor core is the skeleton of the rotor and is typically constructed from laminated silicon steel sheets to reduce iron loss and improve efficiency. The rotor windings are the conduit for current, driving the rotor to rotate through the electromagnetic force generated by the current in the magnetic field. The rotor shaft is the key component connecting the rotor to the external load and must withstand the rotor's rotational torque and the load's applied force.

[0036] The stator assembly 100 is the stationary portion of the motor, consisting of a stator core and stator windings. The stator core, also constructed from laminated silicon steel sheets, forms the motor's fixed magnetic field. The stator windings surround the stator core and, when energized, generate a magnetic field that interacts with the magnetic field generated by the rotor windings, driving the rotor's rotation.

[0037] During the operation of the motor, the magnetic field generated by the stator assembly 100 interacts with the current in the rotor assembly to form an electromagnetic torque, driving the rotor to rotate. At the same time, the rotation of the rotor also changes the magnetic flux in the stator winding, thereby generating an induced electromotive force, realizing the conversion and transmission of electrical energy.

[0038] The performance and efficiency of a motor are affected by a variety of factors, such as the size of the air gap between the rotor and stator, the design and manufacturing process of the windings, and so on. Specifically, the stator assembly 100 includes a stator yoke 110 and a plurality of stator teeth 120 arranged circumferentially along the stator yoke 110. Each stator tooth 120 includes a stator tooth root 130 connected to the stator yoke 110 and a stator tooth tip 140 located at the end of the stator tooth root 130. An air gap is formed between the stator tooth tip 140 and the rotor. By designing a reasonable structure for the stator tooth 120, unnecessary vibration can be effectively reduced.

[0039] Reference Figure 3 In one embodiment, the contour line of the tooth top notch 141 is arc-shaped, and the tooth top notch 141 is composed of one or more arc segments, such as a U-shape.

[0040] Reference Figure 2 In one embodiment, the contour line of the tooth top notch 141 is a broken line, which is composed of at least two connected line segments, such as a V shape, a W shape, etc.

[0041] The technical solution of the present invention provides a tooth tip notch 141 on the inner edge 144 of the stator tooth tip 140, facing the center of the stator yoke 110. The maximum distance from the tooth tip notch 141 to the center of the stator yoke 110 is r1, and the minimum distance from the stator tooth tip 140 to the center of the stator yoke 110 is D2, where 1 < 2*r1 / D2 ≤ 1.04. By controlling the three-phase fundamental frequency composite magnetic potential, while ensuring that the fundamental wave remains unchanged, the high-harmonic pulsating magnetomotive force is reduced, thereby reducing the vibration and noise generated by the motor. Properly setting the relationship between the distance r1 and D2 of the tooth tip notch 141 can effectively weaken the occurrence of high-harmonic frequency vibration. When the ratio of the minimum distance between the stator tooth tip 140 and the center of the stator yoke 110 is between 1 and 1.04, the generation of high-frequency vibrations can be limited, reducing their impact on the overall system, reducing the possibility of vibration and noise, reducing friction and collisions within the motor, and improving the stability and operating efficiency of the motor, thereby improving the overall performance of the refrigeration equipment. This optimized design can make the refrigeration equipment quieter and more stable, enhance the user experience, and extend the service life of the equipment.

[0042] Specifically, in order to reduce the cost of the motor and improve processing accuracy, the distance from the outer edge of the stator yoke 110 to its center is D1, 0.583≤D2 / D1≤0.610, that is, the ratio of the outer diameter to the inner diameter of the stator is greater than 0.583 and less than 0.610.

[0043] Furthermore, the inner edge 144 of the stator tooth top 140 has a first endpoint 142 and a second endpoint 143 along the rotation direction of the stator assembly 100, and the tooth top notch 141 is close to the first endpoint 142. To ensure the fundamental frequency and reduce high-harmonic frequencies, the tooth top notch 141 is arranged at the end closest to the rotation direction according to the rotation direction.

[0044] Specifically, the point with the greatest distance between the tooth tip notch 141 and the center of the stator yoke 110 is the notch apex. Around the circumference of the stator assembly 100, the distance from the notch apex to the first endpoint 142 is d1, and the distance from the tooth opening apex to the second endpoint 143 is d2, where d1 < d2. By adopting these reasonable position and size parameter settings, the motor's magnetic field distribution can be improved, reducing motor torque pulsation and compressor vibration and noise.

[0045] Reference Figure 1 Furthermore, the distance between the first endpoint 142 and the center of the stator yoke 110 is r2, and the distance between the second endpoint 143 and the center of the stator yoke 110 is r3, where r2 = r3 = D2 / 2. By limiting the distance from the ends of the stator tooth tip 140 to the center, the gap between the rotor assembly and the stator assembly 100 is maintained, facilitating installation of the rotor and stator assemblies 100, facilitating winding of the stator assembly 100, and ensuring electrical safety distances.

[0046] Furthermore, two adjacent stator teeth 120 define a stator slot 150 , the number of the stator slots 150 is Z, the number of poles of the motor is P, and Z / P=3 / 2 or 6 / 5.

[0047] When Z / P = 3 / 2, this ratio usually corresponds to the design of a three-phase asynchronous motor (induction motor). In this case, the number of stator slots 150 is 1.5 times the number of poles, which is suitable for some specific motor application requirements.

[0048] When Z / P=6 / 5, this ratio generally corresponds to the design of a permanent magnet synchronous motor. A permanent magnet synchronous motor generally requires a higher number of stator slots 150 to achieve better performance and efficiency, so this ratio is suitable for the design of a permanent magnet synchronous motor.

[0049] Limiting the ratio of the number of stator slots 150 and the number of motor poles can affect the magnetic field distribution and spatial harmonics of the motor, thereby affecting the efficiency of the motor. In this solution, by reasonably selecting the number of stator slots 150 and the ratio of the number of poles, magnetic field leakage and iron loss can be reduced, thereby improving the efficiency of the motor. Secondly, limiting the number of stator slots 150 and the ratio of the number of motor poles can affect the torque fluctuation of the motor. This solution can make the motor produce a smoother torque output and reduce vibration and noise through a reasonable ratio of the number of slots and the number of poles. Moreover, this solution can also affect the overall size of the motor by limiting the number of stator slots 150 and the ratio of the number of motor poles, optimize the motor design layout, and reduce the size and weight of the motor.

[0050] Furthermore, the motor further comprises an electromagnet, which is provided on the rotor assembly and has a residual magnetism of B r , the width of the stator tooth root 130 is t, 10≤D2*B r / t≤14. By limiting the residual magnetism of the electromagnet (B r ), the width (t) of the stator tooth root 130, and the parameters of the rotor assembly can optimize the magnetic circuit design of the motor to a certain extent, making the magnetic field distribution more uniform when the motor is working, thereby improving the efficiency of the motor. Optimizing the magnetic circuit design can reduce the hysteresis loss and iron loss of the motor, thereby reducing the energy consumption of the motor and improving the overall energy utilization efficiency. By reasonably controlling the ratio of residual magnetism to the width of the stator tooth root 130, the heat generated by the motor during operation can be reduced, effectively reducing the heating of the motor and extending the service life of the motor.

[0051] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since this compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0052] The present invention also provides a refrigeration device including a compressor. The specific structure of the compressor is similar to that of the above-described embodiments. Since the present refrigeration device utilizes all the technical solutions of all the above-described embodiments, it at least has all the beneficial effects provided by the technical solutions of the above-described embodiments, which are not further detailed here. Refrigeration devices include, but are not limited to, refrigerators, air conditioners, freezers, refrigerators, ice makers, air coolers, water chillers, condensers, evaporators, compressors, cooling towers, expansion valves, thermostats, and the like.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A stator assembly, characterized in that: include: a stator yoke and a plurality of stator teeth arranged circumferentially along the stator yoke, the stator teeth comprising a stator tooth root connected to the stator yoke and a stator tooth top located at an end of the stator tooth root, the inner edge of the stator tooth top being provided with a tooth top notch facing the center of the stator yoke, the maximum distance from the tooth top notch to the center of the stator yoke being r1, the distance from the outer edge of the stator yoke to its center being D1, and the minimum distance from the stator tooth top to the center of the stator yoke being D2; Among them, r1 and D2 satisfy the relationship: 1<2*r1 / D2≤1.04; Moreover, D1 and D2 satisfy the relationship: 0.583≤D2 / D1≤0.

610.

2. The stator assembly according to claim 1, wherein In the rotation direction of the stator assembly, two endpoints of the inner edge of the stator tooth top are a first endpoint and a second endpoint, and the tooth top notch is arranged closer to the first endpoint than to the second endpoint.

3. The stator assembly according to claim 2, wherein: The point with the maximum distance from the tooth top notch to the center of the stator yoke is the notch apex. In the circumferential direction of the stator assembly, the distance from the notch apex to the first end point is d1, and the distance from the tooth mouth apex to the second end point is d2, d1<d2.

4. The stator assembly according to claim 2, wherein: The distance from the first end point to the center of the stator yoke is r2, and the distance from the second end point to the center of the stator yoke is r3, where r2=r3=D2 / 2.

5. The stator assembly according to claim 1, wherein: A stator slot is defined between two adjacent stator teeth, the number of the stator slots is Z, the number of poles of the motor is P, and Z / P=3 / 2 or Z / P=6 / 5.

6. The stator assembly according to claim 1, wherein: The rotor assembly matched with the stator assembly includes an electromagnet, the remanence of the electromagnet is Br, the width of the stator tooth root is t, and 10≤D2*Br / t≤14.

7. The stator assembly according to claim 1, wherein: The outline of the tooth top notch is arc-shaped or broken line-shaped.

8. A motor, characterized in that: include: A motor as claimed in any one of claims 1 to 7.

9. A compressor, characterized in that: Comprising the motor as claimed in claim 8.

10. A refrigeration device, characterized in that: Comprising the compressor of claim 9.

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