Stator, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a stator, motor, compressor and refrigeration equipment, relates to the technical field of motor, the stator comprises a plurality of stator units arranged along the circumferential direction of the stator, each stator unit comprises a plurality of stator punching sheets which are sequentially stacked in the axial direction of the stator, each stator unit comprises a yoke part and a tooth part arranged at the inner side of the yoke part, and the tooth part is arranged at the inner side of the yoke part. One of every two adjacent yoke parts is provided with a positioning protrusion, the other one of every two adjacent yoke parts is provided with a positioning groove matched with the positioning protrusion in a positioning mode, any two adjacent stator units are in interference fit through the positioning protrusions and the positioning grooves, and after the multiple stator units are spliced into a whole circle, pre-tightening force exists between every two adjacent stator units. And the end part of the yoke part in the circumferential direction of the stator is provided with a positioning groove and a positioning bulge, so that the movement of each stator unit in the radial direction of the stator is restricted, the position of each stator unit in the circumferential direction and the radial direction of the stator can be determined, and the installation precision of the plurality of stator units before and after assembly is ensured.

Description

Technical Field

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

[0002] The stator and rotor cores of an air conditioner compressor are manufactured by stamping and stacking using a high-speed punch press and specific molds. Currently, there are two main methods for stamping stator cores: integral split stamping and segmented stamping. Compared to integral split stamping, segmented stamping is less efficient and cannot produce the required number of cores at once, thus requiring multiple stamping processes.

[0003] With advancements in mold technology, current segmented stamping processes can simultaneously stamp molds for six stator segments, thus improving efficiency. However, due to the use of different stamping materials, products produced by different molds may vary, affecting motor performance. Furthermore, combining segmented cores from different molds during subsequent assembly may negatively impact the accuracy of the stator core. Utility Model Content

[0004] The main purpose of this utility model is to propose a stator, motor, compressor, and refrigeration equipment, which aims to solve the problem of ensuring the installation accuracy of multiple stator cores before and after assembly for stator cores stamped by an integral split stamping process.

[0005] To achieve the above objectives, the stator proposed in this utility model includes multiple stator units arranged circumferentially thereon. Each stator unit includes multiple stator laminations stacked sequentially in the axial direction of the stator. Each stator unit includes a yoke and a toothed portion located inside the yoke. The toothed portion is for winding with corresponding windings. One of every two adjacent yokes is provided with a positioning protrusion, and the other is provided with a positioning groove that positions and engages with the positioning protrusion. Any two adjacent stator units are interference-fitted by the positioning protrusion and the positioning groove.

[0006] In one embodiment, the interference fit between the positioning protrusion and the positioning groove is δd, where 0.01m ≤ δd ≤ 0.03mm.

[0007] In one embodiment, the yoke has two ends located in the circumferential direction of the stator body, one end of the yoke is provided with the positioning protrusion, and the other end is provided with the positioning groove.

[0008] In one embodiment, the slot width of the positioning groove is d1, and the dimension of the end of the yoke in the radial direction of the stator body is d, where 1 / 4d ≤ d1 ≤ 3 / 4d.

[0009] In one embodiment, the positioning groove is configured as an arc-shaped groove or a square groove.

[0010] In one embodiment, the positioning groove is located at the center of the yoke in the radial direction of the stator body, and correspondingly, the positioning protrusion is located at the center of the yoke in the radial direction of the stator body.

[0011] This utility model also proposes an electric motor, which includes a stator, the stator including a plurality of stator units arranged circumferentially thereon, each stator unit including a plurality of stator laminations stacked sequentially in the axial direction of the stator, the stator unit including a yoke and a toothed portion provided inside the yoke, the toothed portion being wound with corresponding windings, one of each two adjacent yokes being provided with a positioning protrusion, and the other being provided with a positioning groove that positions and engages with the positioning protrusion, any two adjacent stator units being interference-fitted by the positioning protrusion and the positioning groove.

[0012] This utility model also provides a compressor, the compressor including a motor, the motor including a stator, the stator including a plurality of stator units arranged circumferentially thereon, each stator unit including a plurality of stator laminations stacked sequentially in the axial direction of the stator, the stator unit including a yoke and a toothed portion provided inside the yoke, the toothed portion being wound with corresponding windings, one of each two adjacent yokes being provided with a positioning protrusion, and the other being provided with a positioning groove that positions and engages with the positioning protrusion, any two adjacent stator units being interference-fitted by the positioning protrusion and the positioning groove.

[0013] This utility model also provides a refrigeration device, which includes a compressor, a motor, a stator, and a plurality of stator units arranged circumferentially thereon. Each stator unit includes a plurality of stator laminations stacked sequentially along the axial direction of the stator. Each stator unit includes a yoke and a toothed portion located inside the yoke. The toothed portion is for winding corresponding windings. One of every two adjacent yokes is provided with a positioning protrusion, and the other is provided with a positioning groove that positions and engages with the positioning protrusion. Any two adjacent stator units are interference-fitted by the positioning protrusion and the positioning groove.

[0014] In one embodiment, the refrigeration equipment includes an air conditioner.

[0015] In the technical solution of this utility model, the positioning protrusion and the positioning groove are interference-fitted. After the multiple stator units are assembled into a complete circle, there is a preload between each pair of adjacent stator units, so that each stator unit is positioned in a preset position in the circumferential direction. The yoke is provided with the positioning groove and the positioning protrusion at the end of the stator in the circumferential direction, so that the movement of each stator unit in the radial direction of the stator is restricted, further ensuring the position of each stator unit in the radial direction of the stator, and ensuring that the multiple stator units maintain installation accuracy before and after assembly. Attached Figure Description

[0016] 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.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the stator provided by this utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of two adjacent stator units;

[0019] Figure 3 for Figure 1 A schematic diagram of the middle stator unit.

[0020] Explanation of icon numbers:

[0021] 100. Stator; 10. Stator unit; 11. Yoke; 111. Positioning protrusion; a. Positioning groove; 12. Tooth; 200. Rotor.

[0022] 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

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Current segmented stamping processes can simultaneously stamp six segmented stators using dies, thus improving efficiency. However, due to the use of different stamping materials, products produced by different dies may vary, affecting motor performance. Furthermore, combining segmented cores from different dies during subsequent assembly may negatively impact the accuracy of the stator core.

[0027] This utility model proposes a stator 100, which aims to solve the problem of ensuring the installation accuracy of multiple stator cores before and after assembly for stator cores stamped by an integral split stamping process.

[0028] Please see Figures 1 to 3 In one embodiment of the present invention, the stator 100 includes a plurality of stator units 10 arranged circumferentially thereon. Each stator unit 10 includes a plurality of stator laminations stacked sequentially in the axial direction of the stator 100. Each stator unit 10 includes a yoke 11 and a toothed portion 12 disposed inside the yoke 11. The toothed portion 12 is for winding a corresponding winding. One of each pair of adjacent yokes 11 is provided with a positioning protrusion 111, and the other is provided with a positioning groove a that positions and engages with the positioning protrusion 111. Any two adjacent stator units 10 are interference-fitted by the positioning protrusion 111 and the positioning groove a.

[0029] It should be noted that "the stator 100 includes multiple stator units 10 arranged circumferentially" refers to the process of stamping multiple stacked laminations in one go using an integral split stamping technique to create multiple interconnected stator units 10. One of each pair of adjacent yokes 11 is provided with a positioning protrusion 111, and the other is provided with a positioning groove a that engages with the positioning protrusion 111. Simultaneously, each stator unit 10 is formed by stacking multiple stator laminations in sequence and riveting them together at rivet points to form a whole.

[0030] When winding is required, the multiple stator units 10 connected in a ring are disassembled. After each stator unit 10 is fixed by a fixing fixture, the enameled wire is wound onto the tooth 12 of the corresponding stator unit 10, without being restricted by the other stator units 10, thereby increasing the slot fill factor. After winding is completed, the multiple stator units 10 are reassembled. In the overall split-type punching process, after the stator unit 10 undergoes disassembly, winding, and reassembly, its accuracy and strength are comparable to those of a whole-circle stator, improving the yield rate.

[0031] "One of each pair of adjacent yoke portions 11 is provided with a positioning protrusion 111, and the other is provided with a positioning groove a that positions and engages with the positioning protrusion 111." In other words, one stator unit 10 may have two positioning grooves a on its yoke portion 11, and the other stator unit 10 may have two positioning protrusions 111 on its yoke portion 11. The stator unit 10 with the two positioning grooves a engages with the positioning protrusions 111 on the two adjacent stator units 10 on either side. Alternatively, each stator unit 10 may have a positioning protrusion 111 at one end and a positioning groove a at the other end.

[0032] In the technical solution of this utility model, the positioning protrusion 111 and the positioning groove a are interference fit. After the multiple stator units 10 are assembled into a complete circle, there is a preload between each pair of adjacent stator units 10, so that each stator unit 10 is positioned in a preset position in the circumferential direction. The yoke 11 is provided with the positioning groove a and the positioning protrusion 111 at the end of the stator 100 in the circumferential direction, so that the movement of each stator unit 10 in the radial direction of the stator 100 is restricted, further ensuring the position of each stator unit 10 in the radial direction of the stator 100, and ensuring that the multiple stator units 10 maintain installation accuracy before and after assembly.

[0033] It should be noted that the positioning groove a and the positioning protrusion 111 are stamped to form an interference fit, and the processing methods are as follows:

[0034] ① The die can be designed as a slightly inverted cone (the upper end is slightly wider than the lower end). During punching, the material is squeezed rather than sheared. The protruding part expands slightly due to elastic rebound after leaving the die, resulting in a size slightly larger than the groove.

[0035] The clearance between the punch and die is set to a negative value (e.g., -5% of the material thickness), which forces the material to be compressed during punching. The raised edge forms a plastic deformation zone, increasing its size; the groove shrinks due to the material being squeezed, eventually forming an interference fit.

[0036] ② Three-dimensional pressure (blade clamping force, counter-pressure force, and punching force) is used to suppress material tearing and ensure a smooth, burr-free sheared surface. By adjusting the pressure of the blank clamping ring, the protruding part is controlled to be subjected to lateral compression during punching, resulting in plastic deformation, with a size slightly larger than the groove.

[0037] Based on the springback coefficient of silicon steel sheets, the protrusion design size is pre-enlarged (e.g., a 0.02-0.05mm allowance is reserved), and the springback after punching causes the actual size to be over-interference.

[0038] Traditional blanking results in clearance due to shearing, while interference fits rely on the plastic flow of material (such as extrusion and upsetting) rather than simple shearing. For example, the root of a protrusion is subjected to pressure from the sidewall of the die during blanking, resulting in radial plastic expansion and forming a "drum-shaped" protrusion.

[0039] ③ The precision blanking technology is adopted, the groove diameter is designed to be 1.48mm, the protrusion diameter is 1.50mm (interference 0.02mm), the die negative clearance is -0.03mm, and the blank holder force reaches 80% of the material yield strength to achieve a stable interference fit.

[0040] The achievement of interference fit relies on die geometry optimization (inverted taper, negative clearance), material plastic deformation control (fine blanking, extrusion), and dynamic springback compensation. Traditional blanking results in clearance due to pure shearing, while integral split-type stamping can force material flow in a single stamping, allowing the protrusion size to exceed the groove, thus achieving interference fit.

[0041] Specifically, in this embodiment, the interference fit between the positioning protrusion 111 and the positioning groove a is δd, where 0.01m ≤ δd ≤ 0.03mm.

[0042] It is understood that the interference fit δd refers to the dimensional difference designed to achieve a tight connection between two adjacent stator units 10.

[0043] The interference fit between two adjacent stator units 10 is set within the range of 0.01mm≤δd≤0.03mm, which ensures sufficient preload to maintain a tight fit between the two stator units 10, while avoiding assembly difficulties or material damage due to excessive interference fit.

[0044] From a manufacturing perspective, since the stator 100 of this utility model adopts an integral split stamping technology, multi-layer silicon steel sheets are stamped into a stator 100 integral consisting of multiple stator units 10 connected together. The interference fit is mainly generated by plastic deformation and springback after stamping. The interference fit amount δd is set between 0.01mm and 0.03mm, which can conform to the springback coefficient of silicon steel sheets.

[0045] By setting the interference fit between adjacent stator units 10 to between 0.01mm and 0.03mm, sufficient bonding strength can be ensured while taking into account the practical convenience of manufacturing and assembly, and it also helps to improve the overall performance and durability of the motor.

[0046] Specifically, please refer to Figure 3 In this embodiment, the yoke 11 has two ends located in the circumferential direction of the stator 100 body. One end of the yoke 11 is provided with the positioning protrusion 111, and the other end is provided with the positioning groove a.

[0047] Thus, each stator unit 10 is provided with the positioning protrusion 111 and the positioning groove a, and the structure and stress of each stator unit 10 are in the same state. During the operation of the motor, each stator unit 10 can be in a relatively stable state.

[0048] Furthermore, the groove width of the positioning groove a is d1, and the dimension of the end of the yoke 11 in the radial direction of the stator 100 body is d, where 1 / 4d≤d1≤3 / 4d.

[0049] For stamping processes, constraining the width d1 of the positioning groove a to 1 / 4d ≤ d1 ≤ 3 / 4d can reduce die wear during stamping. When the opening of the positioning groove a is too narrow (less than 1 / 4d), the material flow resistance increases, leading to excessive local wear of the die; while when the opening of the positioning groove a is too wide, it affects the accuracy and stability of the part.

[0050] During the stamping process, the metal material needs to undergo plastic deformation under the action of the die. Constraining the groove width d1 of the positioning groove a to 1 / 4d ≤ d1 ≤ 3 / 4d ensures good material flowability and avoids defects such as cracks and wrinkles caused by material accumulation or insufficient stretching. This guarantees the dimensional and shape accuracy of the stamped parts and also improves the fitting accuracy and overall performance of the stator 100 during the subsequent assembly of multiple stator units 10.

[0051] Regarding eddy current losses on the surface of stator 100, constraining the slot width d1 of the positioning slot a to 1 / 4d ≤ d1 ≤ 3 / 4d allows for control of the eddy current flow path within the stator 100 core. A narrower slot width shortens the eddy current flow path, thereby reducing eddy current losses. However, if the slot is too narrow, it may increase manufacturing difficulty and cause material stress concentration problems. Therefore, selecting an appropriate slot width within a specified range can effectively reduce eddy current losses without significantly increasing manufacturing complexity.

[0052] By constraining the slot width d1 of the positioning slot a to 1 / 4d≤d1≤3 / 4d, and ensuring that the slot width is within a reasonable range, the magnetic field distortion caused by structural irregularities can be reduced, and additional eddy current losses can be reduced, thereby lowering eddy current losses.

[0053] By controlling the slot width of the positioning slot a within the above range, electrical performance and mechanical manufacturing can be balanced, effectively reducing eddy current losses on the surface of stator 100, while also ensuring the feasibility of the manufacturing process, thereby improving the efficiency and performance of the motor.

[0054] Specifically, in this embodiment, the positioning groove a is set as an arc-shaped groove or a square groove.

[0055] The shape of the positioning groove a can be an arc-shaped groove, a square groove, or a combination of irregular-shaped grooves.

[0056] It is understood that the positioning groove a is preferably an arc-shaped groove. Compared with the square groove, the edge of the arc-shaped groove is smoother, which can effectively disperse the local stress caused by the interference fit and reduce stress concentration.

[0057] Due to the shape of the arc-shaped groove, a natural and smooth guide surface is provided, making it easier to align and match adjacent stator units 10 during assembly. The arc-shaped groove design reduces the presence of sharp angles, making inter-component insertion smoother and reducing the required insertion force. The adaptive alignment method can tolerate minor manufacturing errors or installation deviations to a certain extent, thus simplifying the assembly process. Furthermore, if fine-tuning is required to achieve the optimal position, the arc-shaped groove offers greater flexibility than the square groove, facilitating quick and accurate assembly.

[0058] The contact surface between the arc-shaped groove and the positioning protrusion 111 is designed as a curved surface contact, which provides a larger actual contact area compared to the planar contact of the square groove. This allows for more even pressure distribution, further improving connection stability and facilitating a tighter interference fit.

[0059] In summary, regarding ease of assembly, setting the positioning groove a as an arc-shaped groove can reduce stress concentration, improve alignment accuracy, increase contact area, facilitate insertion and adjustment, and improve structural stability, thereby improving assembly efficiency and quality.

[0060] Specifically, in this embodiment, the positioning groove a is located at the center of the yoke 11 in the radial direction of the stator 100 body, and correspondingly, the positioning protrusion 111 is located at the center of the yoke 11 in the radial direction of the stator 100 body.

[0061] By setting the positioning groove a and the positioning protrusion 111 at the center of the yoke 11 in the radial direction of the stator 100 body, the mechanical stress generated during assembly can be more evenly distributed on the yoke 11, thereby avoiding local deformation or damage caused by stress concentration, and thus enhancing the structural stability of the stator unit 10.

[0062] This utility model also proposes an electric motor, which includes a rotor 200 and a stator 100. The rotor 200 is disposed on the radial inner side of the stator 100. The specific structure of the stator 100 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.

[0063] This utility model also proposes a compressor, which includes a cylinder and a motor. The motor drives the rolling piston of the cylinder to move. The specific structure of the compressor 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.

[0064] This utility model also proposes a refrigeration device, which includes a heat exchanger and a compressor. The specific structure of the refrigeration device 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.

[0065] In one specific embodiment, the refrigeration equipment includes an air conditioner.

[0066] By setting the stator 100, the air conditioner enables the plurality of stator units 10 of the motor to maintain installation accuracy before and after assembly, ensuring minimum gaps between internal components of the motor, reducing unnecessary energy loss, reducing the impact on the overall energy efficiency ratio (EER) of the air conditioning system, and making the air conditioner operate more energy-efficiently.

[0067] 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, The stator includes multiple stator units arranged circumferentially. Each stator unit includes multiple stator laminations stacked sequentially along the axial direction of the stator. Each stator unit includes a yoke and a toothed portion located inside the yoke. The toothed portion is for winding a corresponding winding. One of each pair of adjacent yokes is provided with a positioning protrusion, and the other is provided with a positioning groove that positions and engages with the positioning protrusion. Any two adjacent stator units are interference-fitted through the positioning protrusion and the positioning groove.

2. The stator as described in claim 1, characterized in that, The interference fit between the positioning protrusion and the positioning groove is δd, where 0.01m ≤ δd ≤ 0.03mm.

3. The stator as described in claim 1, characterized in that, The yoke has two ends located in the circumferential direction of the stator body. One end of the yoke is provided with the positioning protrusion, and the other end is provided with the positioning groove.

4. The stator as described in claim 3, characterized in that, The width of the positioning groove is d1, and the radial dimension of the end of the yoke on the stator body is d, where 1 / 4d ≤ d1 ≤ 3 / 4d.

5. The stator as described in claim 1, characterized in that, The positioning groove is configured as an arc-shaped groove or a square groove.

6. The stator as described in claim 1, characterized in that, The positioning groove is located at the center of the yoke in the radial direction of the stator body, and correspondingly, the positioning protrusion is located at the center of the yoke in the radial direction of the stator body.

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

8. A compressor, characterized in that, Includes the motor as described in claim 7.

9. A refrigeration device, characterized in that, Includes the compressor as described in claim 8.

10. The refrigeration equipment as described in claim 9, characterized in that, The refrigeration equipment includes an air conditioner.

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