Motor slot insulation structure, stator assembly and motor

Abstract

This utility model provides a motor slot insulation structure, a stator assembly, and a motor. The motor slot insulation structure includes: a body portion, which is bent to form a receiving slot and has an opening that connects the receiving slot to an external space; a first extension portion, which is connected to an end of the body portion and extends into the receiving slot; and a second extension portion, which is connected to an end of the first extension portion and forms a predetermined angle with the first extension portion, located on the side of the first extension portion closer to the interior of the receiving slot. The motor slot insulation structure of this utility model solves the technical problem of insufficient electrical and structural strength in related technologies.

Description

Technical Field

[0001] This utility model relates to the field of motor structure design, specifically to a motor slot insulation structure, a stator assembly, and a motor. Background Technology

[0002] Slot insulation is the insulating material inside the stator slots of a motor. It separates the core and windings, preventing electrical breakdown, achieving electrical isolation, ensuring normal equipment operation, and providing mechanical support to the windings to ensure the stability of the motor during operation. Because slot insulation typically has good heat resistance, oil resistance, and refrigerant resistance, it can enhance the motor's adaptability to extreme environments such as high temperatures, humidity, and pollution.

[0003] As the requirements for miniaturization and weight reduction in motors become increasingly stringent, slot insulation materials are also evolving towards thinner, lighter, and higher-performance designs. However, in related technologies, making the slot insulation material too thin can lead to insufficient electrical and structural strength in the slot insulation structure, affecting the reliability of motor operation.

[0004] It is evident that the relevant technologies suffer from insufficient electrical and structural strength in the motor slot insulation structure. Currently, no effective solution has been proposed to address these issues.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content

[0006] The main objective of this invention is to provide a motor slot insulation structure, a stator assembly, and a motor to solve the technical problem of insufficient electrical and structural strength of motor slot insulation structures in related technologies.

[0007] To achieve the above objectives, according to one aspect of the present invention, a motor slot insulation structure is provided, comprising: a body portion, the body portion being bent to form a receiving slot, the body portion having a slot opening that connects the receiving slot to an external space; a first extension portion, the first extension portion being connected to an end of the body portion and extending toward the interior of the receiving slot; and a second extension portion, the second extension portion being connected to an end of the first extension portion, the second extension portion being set at a preset angle to the first extension portion, and the second extension portion being located on the side of the first extension portion closer to the interior of the receiving slot.

[0008] Furthermore, the included angle θ1 between the second extension and the first extension has a range of 0°≤θ1≤45°.

[0009] Furthermore, the motor slot insulation structure satisfies: 4≤T2 / T1≤8, where T1 is the thickness of the main body and T2 is the length of the second extension.

[0010] Furthermore, the main body includes a bottom section, a side wall section, and a connecting section. The connecting section is located between the bottom section and the side wall section. Both the bottom section and the side wall section are connected to the connecting section. At least part of the outer surface of the connecting section is an arc-shaped structure. The motor slot insulation structure satisfies: 0.08≤T1 / R1≤0.25, where T1 is the thickness of the main body and R1 is the radius of the arc-shaped structure.

[0011] Furthermore, the thickness T1 of the main body is in the range of 0.075mm≤T1≤0.25mm.

[0012] Furthermore, the motor slot insulation structure shall meet at least one of the following requirements: the power frequency electrical strength X of the motor slot insulation structure is 60V / μm≤X≤120V / μm; the long-term heat resistance rating of the motor slot insulation structure is Class B; and the slot insulation structure is made of PET material.

[0013] According to another aspect of the present invention, a stator assembly is provided, the stator assembly comprising: a plurality of motor slot insulation structures, the motor slot insulation structures being the aforementioned motor slot insulation structures; a stator body having a plurality of stator teeth, wherein a stator slot is formed between any two adjacent stator teeth, and the plurality of motor slot insulation structures are installed one-to-one in the plurality of stator slots.

[0014] Furthermore, the structure of the stator assembly satisfies: 2% ≤ S2 / S1 ≤ 6%, where S1 is the cross-sectional area of ​​the stator slot along the preset plane, S2 is the cross-sectional area of ​​the motor slot insulation structure along the preset plane, and the preset plane is a plane perpendicular to the axial direction of the stator assembly.

[0015] Furthermore, the structure of the stator assembly satisfies at least one of the following: 5≤L1 / (T1*Z)≤10, where L1 is the width of the stator teeth along the circumferential direction of the stator assembly, T1 is the thickness of the main body of the motor slot insulation structure, and Z is the number of stator slots; 0.09≤T1 / L2≤0.16, where T1 is the thickness of the main body of the motor slot insulation structure, and L2 is the length of the slot opening along the radial direction of the stator assembly; 2mm≤L3-L4≤6mm, where L3 is the length of the motor slot insulation structure along the axial direction of the stator assembly, and L4 is the length of the stator body along the axial direction of the stator assembly.

[0016] According to another aspect of the present invention, an electric motor is provided, characterized in that the electric motor includes the stator assembly described above.

[0017] The motor slot insulation structure applying the technical solution of this utility model includes: a main body portion, which is bent to form a receiving slot, the main body portion having a slot opening that connects the receiving slot to an external space; a first extension portion, which is connected to the end of the main body portion and extends into the receiving slot; and a second extension portion, which is connected to the end of the first extension portion, the second extension portion and the first extension portion being set at a predetermined angle, the second extension portion being located on the side of the first extension portion closer to the inside of the receiving slot. By providing a first extension portion at the end of the main body portion and a second extension portion at the end of the first extension portion, the motor slot insulation structure using the above-described structure can provide targeted electrical and structural reinforcement at the slot opening of the receiving slot. Specifically, by providing the first extension portion and the second extension portion, the insulation effect near the slot opening can be improved, reducing the risk of discharge between the stator core and the coil near the slot opening, thereby specifically reinforcing the weakest point in the electrical protection of the motor slot insulation structure and improving the electrical strength of the motor slot insulation structure. By incorporating the first and second extensions, the risk of deformation or breakage at the slot opening of the motor slot insulation structure due to tension during stator winding can be reduced, thereby improving the structural strength of the motor slot insulation structure and lowering the risk of manufacturing defects caused by deformation or breakage. Therefore, the motor slot insulation structure with the above-described design, through the design of the first and second extensions, can specifically strengthen the electrical and structural strength at weak points near the slot opening, thus solving the technical problem of insufficient electrical and structural strength in related technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of an embodiment of the motor slot insulation structure of this utility model;

[0020] Figure 2 This is a partial structural schematic diagram of an embodiment of the stator assembly of this utility model (only one motor slot insulation structure is shown in the figure).

[0021] The above figures include the following reference numerals:

[0022] 1. Main body; 11. Receiving groove; 12. Groove opening; 101. Bottom section of the groove; 102. Side wall section; 103. Connecting section;

[0023] 2. First extension;

[0024] 3. Second extension;

[0025] 10. Motor slot insulation structure;

[0026] 20. Stator body; 201. Stator teeth; 202. Stator slots. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] Please refer to Figure 1 To address the technical problems described in the background section, embodiments of this utility model provide a motor slot insulation structure, comprising: a body portion 1, which is bent to form a receiving slot 11, the body portion 1 having a slot opening 12 that connects the receiving slot 11 to an external space; a first extension portion 2, which is connected to the end of the body portion 1 and extends toward the interior of the receiving slot 11; and a second extension portion 3, which is connected to the end of the first extension portion 2 and forms a preset angle with the first extension portion 2, the second extension portion 3 being located on the side of the first extension portion 2 closer to the interior of the receiving slot 11.

[0029] The motor slot insulation structure designed as described above, by providing a first extension 2 at the end of the main body 1 and a second extension 3 at the end of the first extension 2, can provide targeted electrical and structural reinforcement at the slot opening 12 of the receiving slot 11. Specifically, by providing the first extension 2 and the second extension 3, the insulation effect near the slot opening 12 can be improved, reducing the risk of discharge between the stator core and the coil near the slot opening 12. This allows for targeted reinforcement of the weakest point in the electrical protection of the motor slot insulation structure, thereby improving the electrical strength of the motor slot insulation structure. By providing the first extension 2 and the second extension 3, the risk of deformation or breakage of the motor slot insulation structure at the slot opening 12 due to tension during stator winding can be reduced, improving the structural strength of the motor slot insulation structure and reducing the risk of manufacturing defects caused by deformation or breakage of the motor slot insulation structure. Therefore, the motor slot insulation structure with the above-mentioned structural design can specifically strengthen the electrical and structural strength of the weak position near the slot opening 12 by designing the first extension 2 and the second extension 3, which can solve the technical problem of insufficient electrical and structural strength of the motor slot insulation structure in related technologies.

[0030] In a preferred embodiment, there are two first extensions 2 and two second extensions 3. The two first extensions 2 are disposed at both ends of the main body 1 in a one-to-one correspondence, and the two second extensions 3 are connected to the two first extensions 2 in a one-to-one correspondence, thereby providing electrical and structural reinforcement to both sides of the slot opening 12 of the motor slot insulation structure and improving the reliability of the motor slot insulation structure.

[0031] In some preferred embodiments, the included angle θ1 between the second extension 3 and the first extension 2 ranges from 0° to 45°. Within this angle range, the first extension 2 and the second extension 3 provide better enhancement of the mechanical and electrical strength of the motor slot insulation structure. When θ1 is 0°, the first extension 2 and the second extension 3 are completely fitted together. At this point, θ1 is the minimum value required to achieve both electrical and structural reinforcement. The upper limit of θ1 is designed to be 45° to avoid excessive θ1 causing interference between the motor slot insulation structure and the coil during winding, which could lead to poor winding.

[0032] In some embodiments, the motor slot insulation structure satisfies: 4 ≤ T2 / T1 ≤ 8, where T1 is the thickness of the main body 1 and T2 is the length of the second extension 3. Specifically, if T2 / T1 is designed to be too small (less than 4), the length of the second extension 3 will be insufficient, making it difficult to effectively improve electrical strength. If T2 / T1 is designed to be too large (greater than 8), the excessive length of the second extension 3 will cause inconvenience to the manufacturing and installation process. In this embodiment, by designing T2 / T1 to be 4 ≤ T2 / T1 ≤ 8, the electrical insulation effect and installation convenience of the motor slot insulation structure can be well balanced.

[0033] like Figure 1 As shown, the main body 1 of the motor slot insulation structure in this embodiment includes a slot bottom section 101, a side wall section 102, and a connecting section 103. The connecting section 103 is located between the slot bottom section 101 and the side wall section 102, and both the slot bottom section 101 and the side wall section 102 are connected to the connecting section 103. At least a portion of the outer surface of the connecting section 103 is an arc-shaped structure. The motor slot insulation structure satisfies the following condition: 0.08 ≤ T1 / R1 ≤ 0.25, where T1 is the thickness of the main body 1 and R1 is the radius of the arc-shaped structure. If T1 / R1 is too small, the motor slot insulation structure is prone to deformation or cracking, resulting in a higher defect rate. If T1 / R1 is too large, the winding area of ​​the motor slot insulation structure will be too small, leading to an inability to effectively improve motor efficiency. In this embodiment, by designing T1 / R1 to be 0.08 ≤ T1 / R1 ≤ 0.25, the strength and winding area of ​​the motor slot insulation structure can be well balanced, improving motor efficiency while ensuring motor reliability.

[0034] In a preferred embodiment, the thickness T1 of the body portion 1 ranges from 0.075mm ≤ T1 ≤ 0.25mm. The thickness of the motor slot insulation structure in the prior art is generally greater than 0.25mm. In the compressor field, since the motor slot insulation structure occupies the stator slot area, it affects the slot fill factor of the motor, which is crucial for improving motor performance. To ensure the voltage withstand performance and structural strength of the motor slot insulation structure and reduce the failure rate caused by thin slot insulation, the prior art often uses a thicker motor slot insulation structure, which affects the improvement of the slot fill factor. However, in this application, by employing the aforementioned first extension 2 and second extension 3 to specifically strengthen the electrical and structural strength at the weak points near the slot opening 12, the technical problem of insufficient electrical and structural strength of the motor slot insulation structure in the related art can be solved. Therefore, while ensuring the electrical and structural strength of the motor slot insulation structure, the thickness of the main body 1 of the motor slot insulation structure can be designed to be thinner. Specifically, the thickness T1 of the main body 1 is in the range of 0.075mm≤T1≤0.25mm. This effectively increases the winding space and improves the slot fill factor while ensuring that the withstand voltage and structural strength meet the requirements, thereby improving the motor performance.

[0035] The motor slot insulation structure meets the following requirements: the power frequency electrical strength X of the motor slot insulation structure must be 60V / μm ≤ X ≤ 120V / μm. Specifically, if the power frequency electrical strength X is too low (below 60V / μm), discharge may easily occur, affecting the reliability of motor operation. By designing the power frequency electrical strength X to be 60V / μm ≤ X ≤ 120V / μm, electrical safety is ensured while controlling costs, thereby improving the reliability of motor operation. The long-term heat resistance rating of the motor slot insulation structure is Class B. The long-term heat resistance rating is classified according to the maximum allowable temperature of the insulation material under long-term normal operating conditions. Common classifications include Y (90℃), A (105℃), E (120℃), B (130℃), F (155℃), H (180℃), etc., with higher temperatures indicating higher heat resistance ratings. Designing the long-term heat resistance rating of the motor slot insulation structure to Class B allows for long-term stable use in the motor operating environment, ensuring the stability of motor operation. In a specific embodiment, the slot insulation structure is made of PET material.

[0036] An embodiment of this utility model also provides a stator assembly, which includes: a plurality of motor slot insulation structures 10, wherein the motor slot insulation structures 10 are the aforementioned motor slot insulation structures; a stator body 20, wherein the stator body 20 has a plurality of stator teeth 201, wherein a stator slot 202 is formed between any two adjacent stator teeth 201, and the plurality of motor slot insulation structures 10 are installed in the plurality of stator slots 202 in a one-to-one correspondence.

[0037] In some preferred embodiments, the stator assembly structure satisfies: 2% ≤ S2 / S1 ≤ 6%, where S1 is the cross-sectional area of ​​the stator slot 202 along a preset plane, and S2 is the cross-sectional area of ​​the motor slot insulation structure 10 along a preset plane, which is a plane perpendicular to the axial direction of the stator assembly. In the prior art, the S2 / S1 ratio of stator assemblies is generally greater than 6%. However, in this application, by employing the aforementioned first extension 2 and second extension 3 to specifically strengthen the electrical and structural strength at weak locations near the slot opening 12, the technical problem of insufficient electrical and structural strength of the motor slot insulation structure in related technologies can be solved. Therefore, while ensuring the electrical and structural strength of the motor slot insulation structure, the thickness of the motor slot insulation structure body 1 can be designed to be thinner, thereby controlling S2 / S1 within the range of 2% ≤ S2 / S1 ≤ 6%, thus effectively improving the coil winding area and motor efficiency.

[0038] In this embodiment, the stator assembly structure satisfies: 5≤L1 / (T1*Z)≤10, where L1 is the width of the stator teeth 201 along the circumferential direction of the stator assembly, T1 is the thickness of the body portion 1 of the motor slot insulation structure 10, and Z is the number of stator slots 202. Specifically, the larger L1 / (T1*Z) is, the smaller the stator slot area, which leads to an increase in motor copper losses. The smaller L1 / (T1*Z) is, the higher the magnetic flux density of the stator teeth, which leads to an increase in motor iron losses. By ensuring 5≤L1 / (T1*Z)≤10, motor copper and iron losses can be effectively controlled, improving motor efficiency. 0.09≤T1 / L2≤0.16, where T1 is the thickness of the body portion 1 of the motor slot insulation structure 10, and L2 is the length of the slot opening of the stator slot 202 along the radial direction of the stator assembly. If T1 / L2 is too small, the slot area will become smaller, which is detrimental to improving motor efficiency. An excessively large T1 / L2 ratio will increase iron loss at the slot tip and affect motor efficiency. The ratio should be 2mm ≤ L3-L4 ≤ 6mm, where L3 is the length of the motor slot insulation structure 10 along the axial direction of the stator assembly, and L4 is the length of the stator body 20 along the axial direction of the stator assembly. In other words, the motor slot insulation structure protrudes from the iron core along the axial direction of the stator assembly to enhance electrical strength. If L3-L4 is too small, electrical malfunctions may occur under harsh operating conditions; if L3-L4 is too large, it will cause winding difficulties and adversely affect the assembly process.

[0039] In addition, embodiments of this utility model also provide an electric motor, which includes the stator assembly described above. Preferably, in order to better adapt to the motor slot insulation structure 10 described above, the motor is a concentrated winding type motor.

[0040] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0041] The motor slot insulation structure of this utility model embodiment includes: a body portion 1, which is bent to form a receiving slot 11, and has a slot opening 12 that connects the receiving slot 11 to the external space; a first extension portion 2, which is connected to the end of the body portion 1 and extends into the receiving slot 11; and a second extension portion 3, which is connected to the end of the first extension portion 2 and forms a preset angle with the first extension portion 2, with the second extension portion 3 located on the side of the first extension portion 2 closer to the inside of the receiving slot 11. By using the above-described motor slot insulation structure, and by providing the first extension portion 2 at the end of the body portion 1 and the second extension portion 3 at the end of the first extension portion 2, targeted electrical and structural reinforcement can be provided at the slot opening 12 of the receiving slot 11 through the first extension portion 2 and the second extension portion 3. Specifically, by providing the first extension 2 and the second extension 3, the insulation effect near the slot opening 12 can be improved, reducing the risk of discharge between the stator core and the coil near the slot opening 12. This allows for targeted reinforcement of the weakest point in the electrical protection of the motor slot insulation structure, thereby increasing the electrical strength of the motor slot insulation structure. Furthermore, by providing the first extension 2 and the second extension 3, the risk of deformation or breakage of the motor slot insulation structure at the slot opening 12 during stator winding can be reduced, improving the structural strength of the motor slot insulation structure and reducing the risk of manufacturing defects due to deformation or breakage. Therefore, the motor slot insulation structure with the above-described design, through the design of the first extension 2 and the second extension 3, can specifically strengthen the electrical and structural strength of the weak points near the slot opening 12, solving the technical problem of insufficient electrical and structural strength in motor slot insulation structures in related technologies.

[0042] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A motor slot insulation structure, characterized in that, include: The body part (1) is bent to form a receiving groove (11), and the body part (1) has a slot (12) that connects the receiving groove (11) to the external space. The first extension (2) is connected to the end of the main body (1) and extends into the receiving groove (11). The second extension (3) is connected to the end of the first extension (2). The second extension (3) is set at a preset angle to the first extension (2). The second extension (3) is located on the side of the first extension (2) near the inside of the receiving groove (11).

2. The motor slot insulation structure according to claim 1, characterized in that, The angle θ1 between the second extension (3) and the first extension (2) is in the range of 0°≤θ1≤45°.

3. The motor slot insulation structure according to claim 1, characterized in that, The insulation structure of the motor slot satisfies: 4≤T2 / T1≤8, where T1 is the thickness of the main body (1) and T2 is the length of the second extension (3).

4. The motor slot insulation structure according to claim 1, characterized in that, The main body (1) includes a slot bottom section (101), a side wall section (102), and a connecting section (103). The connecting section (103) is located between the slot bottom section (101) and the side wall section (102). Both the slot bottom section (101) and the side wall section (102) are connected to the connecting section (103). At least a portion of the outer surface of the connecting section (103) is an arc-shaped structure. The motor slot insulation structure satisfies the following: 0.08≤T1 / R1≤0.25, where T1 is the thickness of the main body (1) and R1 is the radius of the arc-shaped structure.

5. The motor slot insulation structure according to any one of claims 1 to 4, characterized in that, The thickness T1 of the main body (1) is in the range of 0.075mm≤T1≤0.25mm.

6. The motor slot insulation structure according to any one of claims 1 to 4, characterized in that, The motor slot insulation structure satisfies at least one of the following: The power frequency electrical strength X of the motor slot insulation structure satisfies 60V / μm≤X≤120V / μm; The long-term heat resistance rating of the motor slot insulation structure is Class B. The groove insulation structure is made of PET material.

7. A stator assembly, characterized in that, The stator assembly includes: Multiple motor slot insulation structures (10), wherein the motor slot insulation structure (10) is the motor slot insulation structure according to any one of claims 1 to 6; The stator body (20) has multiple stator teeth (201), and a stator slot (202) is formed between any two adjacent stator teeth (201). Multiple motor slot insulation structures (10) are installed in the multiple stator slots (202) in a one-to-one correspondence.

8. The stator assembly according to claim 7, characterized in that, The structure of the stator assembly satisfies: 2%≤S2 / S1≤6%, where S1 is the cross-sectional area of ​​the stator slot (202) along the preset plane, and S2 is the cross-sectional area of ​​the motor slot insulation structure (10) along the preset plane, and the preset plane is a plane perpendicular to the axial direction of the stator assembly.

9. The stator assembly according to claim 7, characterized in that, The structure of the stator assembly satisfies at least one of the following: 5≤L1 / (T1*Z)≤10, where L1 is the width of the stator tooth (201) along the circumferential direction of the stator assembly, T1 is the thickness of the body part (1) of the motor slot insulation structure (10), and Z is the number of stator slots (202); 0.09≤T1 / L2≤0.16, where T1 is the thickness of the body part (1) of the motor slot insulation structure (10), and L2 is the length of the slot opening of the stator slot (202) along the radial direction of the stator assembly; 2mm≤L3-L4≤6mm, where L3 is the length of the motor slot insulation structure (10) along the axial direction of the stator assembly, and L4 is the length of the stator body (20) along the axial direction of the stator assembly.

10. An electric motor, characterized in that, The motor includes the stator assembly according to any one of claims 7 to 9.

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