Composite strip, iron core, and motor

Abstract

A composite strip, an iron core, and a motor. The composite strip comprises: at least two first-type material layers; a second-type material layer disposed between two adjacent first-type material layers; and an adhesive layer disposed between a first-type material layer and the second-type material layer. A first-type contact angle is formed between the adhesive layer and a surface of the first-type material layer, and a second-type contact angle is formed between the adhesive layer and a surface of the second-type material layer. The ratio of the first-type contact angle to the second-type contact angle is in a range of greater than or equal to 1.4 and less than 18.

Description

Composite strip, iron core and motor

[0001] This application claims priority to Chinese Patent Application No. 202422954575.9, filed on November 29, 2024, entitled "Composite Strip, Iron Core and Electric Motor", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of motor technology, and in particular to a composite strip, an iron core, and a motor. Background Technology

[0003] In the preparation of composite strip, multiple material layers are wound together using a winding process. Then, the wound material layers are immersed in adhesive. After the adhesive cures, a composite strip roll is obtained. The composite strip roll is then peeled off into composite strip. Because the various material layers inside the composite strip roll are tightly bonded, some tightly bonded material layers may break when the composite strip roll is peeled off. Summary of the Invention

[0004] In view of this, embodiments of this application provide a composite strip, an iron core, and a motor, which aim to improve the problem that some material layers inside the composite strip may break when the strip is peeled off.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a composite strip, comprising:

[0006] At least two layers of type I material;

[0007] The second type of material layer is disposed between two adjacent first type of material layers;

[0008] An adhesive layer is disposed between the first type of material layer and the second type of material layer;

[0009] The adhesive layer has a first type of wetting angle with the surface of the first type of material layer, and the adhesive layer has a second type of wetting angle with the surface of the second type of material layer;

[0010] The ratio of the first type of wetting angle to the second type of wetting angle is greater than or equal to 1.4 and less than 18.

[0011] In some embodiments of this application, the ratio of the first type of wetting angle to the second type of wetting angle is greater than or equal to 2 and less than or equal to 7.5.

[0012] In some embodiments of this application, the value range of the first type of wetting angle is greater than or equal to 35° and less than 90°; optionally, the value range of the first type of wetting angle is greater than or equal to 40° and less than or equal to 60°.

[0013] In some embodiments of this application, the value range of the second type of wetting angle is greater than or equal to 5° and less than or equal to 25°; optionally, the value range of the second type of wetting angle is greater than or equal to 8° and less than or equal to 20°.

[0014] In some embodiments of this application, the first type of material layer includes silicon steel strip.

[0015] In some embodiments of this application, the second type of material layer includes amorphous alloy strip.

[0016] In some embodiments of this application, the stacking factor of the composite strip ranges from 0.95 to 0.98.

[0017] In some embodiments of this application, the saturation magnetic induction intensity of the composite strip is 1.7T to 1.8T.

[0018] In some embodiments of this application, the thickness of the second type of material layer ranges from 0.025 mm to 0.028 mm; and / or the thickness of the first type of material layer ranges from 0.2 mm to 0.35 mm.

[0019] In some embodiments of this application, the total thickness of the composite strip is less than or equal to 2 mm.

[0020] In some embodiments of this application, the viscosity of the adhesive layer is less than 1000 centipoise; optionally, the viscosity of the adhesive layer is less than 500 centipoise.

[0021] In some embodiments of this application, the hardness of the adhesive layer ranges from 50 Shore D to 100 Shore D.

[0022] Secondly, embodiments of this application provide an iron core made of the aforementioned composite strip.

[0023] Thirdly, embodiments of this application provide an electric motor, including the aforementioned iron core.

[0024] This application provides a composite tape comprising a first type of material layer, a second type of material layer, and an adhesive layer. The adhesive layer and the surface of the first type of material layer have a first type of wetting angle, and the adhesive layer and the surface of the second type of material layer have a second type of wetting angle. Because the first type of wetting angle is significantly larger than the second type of wetting angle, there is greater separation between the first type of material layer and the adhesive layer, making it easier to peel off. When peeling the composite tape roll, this helps prevent the second type of material layer from breaking due to peeling.

[0025] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of the structure of composite strips according to some embodiments of this application;

[0028] Figure 2 is a structural schematic diagram of the composite strip according to some other embodiments of this application;

[0029] Figure 3 is a structural schematic diagram of the composite strip winding state of some embodiments of this application.

[0030] Reference numerals: 10, first type of material layer; 20, second type of material layer; 30, adhesive layer. Detailed Implementation

[0031] The technical solutions of the embodiments of this application 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 this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0032] Motor cores are typically classified into silicon steel cores, amorphous alloy cores, or nanocrystalline cores. However, each of these types of cores has its own inherent limitations. Therefore, to overcome these limitations, composite strips made from multiple materials can be used to fabricate motor cores, thus combining the performance advantages of various materials.

[0033] This application provides a composite strip, comprising:

[0034] At least two layers of type I material;

[0035] The second type of material layer is disposed between two adjacent first type of material layers;

[0036] An adhesive layer is disposed between the first type of material layer and the second type of material layer;

[0037] The adhesive layer has a first type of wetting angle with the surface of the first type of material layer, and the adhesive layer has a second type of wetting angle with the surface of the second type of material layer;

[0038] The ratio of the first type of wetting angle to the second type of wetting angle is greater than or equal to 1.4 and less than 18.

[0039] This application provides a composite tape comprising a first type of material layer, a second type of material layer, and an adhesive layer. The adhesive layer and the surface of the first type of material layer have a first type of wetting angle, and the adhesive layer and the surface of the second type of material layer have a second type of wetting angle. Since the first type of wetting angle is much larger than the second type of wetting angle, it helps to have greater separation between the first type of material layer and the adhesive layer, making it easier to peel off. When peeling the composite tape roll, it helps to prevent the second type of material layer from breaking due to peeling.

[0040] It should be noted that the ratio of the first type of wetting angle to the second type of wetting angle is less than but not equal to 18. That is, the ratio of the first type of wetting angle to the second type of wetting angle can be infinitely close to 18.

[0041] It should be noted that the first type of wetting angle refers to the wetting angle between the adhesive layer and the surface of the first type of material layer in the liquid phase, quantifying the degree of wetting of the adhesive layer on the surface of the first type of material layer in the liquid phase. If the adhesive layer spreads on the surface of the first type of material layer in the liquid phase, it indicates good wetting, and the value of the first type of wetting angle is relatively large. If the adhesive layer forms water droplets on the surface of the first type of material layer in the liquid phase, it indicates poor or no wetting, and the value of the first type of wetting angle is relatively small. Similarly, the second type of wetting angle refers to the wetting angle between the adhesive layer and the surface of the second type of material layer in the liquid phase, quantifying the degree of wetting. If the adhesive layer spreads on the surface of the second type of material layer in the liquid phase, it indicates good wetting, and the value of the second type of wetting angle is relatively large. If the adhesive layer appears as water droplets on the surface of the second type of material layer in the liquid phase, it indicates that the adhesive layer is poorly or not wetted on the surface of the second type of material layer in the liquid phase. In this case, the value of the second type of wetting angle is relatively small.

[0042] In some embodiments of this application, the first type of material layer may be silicon steel strip.

[0043] It is understandable that silicon steel strip has a high saturation magnetic induction intensity, and using silicon steel strip as part of a composite strip helps to improve the saturation magnetic induction intensity of the composite strip.

[0044] In an exemplary embodiment, silicon steel strip is used as an example of the first type of material layer. Silicon steel strip has good stamping resistance. By placing silicon steel strip on both sides of the second type of material layer, it acts as an effective buffer during the stamping of the composite strip, helping to protect the second type of material layer sandwiched within it. This allows the composite strip to be stamped continuously without cracking or burrs on its surface after stamping, reducing damage to the stamping die. Furthermore, the relatively large thickness of the silicon steel strip reduces the requirements for die clearance control, thus helping to extend the service life of the stamping die.

[0045] In some embodiments of this application, the number of first-type material layers can be at least two. Exemplarily, the number of first-type material layers can be two, three, or more. When the number of first-type material layers is two, a second-type material layer is disposed between the two first-type material layers; when the number of first-type material layers is three, the first-type material layers are not disposed adjacent to each other, that is, there is at least one second-type material layer between two adjacent first-type material layers.

[0046] In some embodiments of this application, the number of second-type material layers can be at least one. Further, the number of second-type material layers can be two or more. Exemplarily, the number of second-type material layers can be one, three, five, eight, ten, or values ​​between these two.

[0047] It should be noted that when there are two or more second-type material layers, the adhesive layer is not only placed between the first-type material layer and the second-type material layer, but also between two adjacent second-type material layers.

[0048] Referring to Figure 1, there can be two first-type material layers 10 and one second-type material layer 20. The second-type material layer 20 is sandwiched between the two first-type material layers 10, and the adhesive layer 30 is between the first-type material layers 10 and the second-type material layer 20.

[0049] Referring to Figure 2, there can be two first-type material layers 10 and three second-type material layers 20. The three second-type material layers 20 are sandwiched between two first-type material layers 10. The adhesive layer 30 is between the first-type material layer 10 and the second-type material layer 20 and between the two second-type material layers 20.

[0050] In some embodiments of this application, the thickness of the first type of material layer ranges from 0.2 mm to 0.35 mm. Further, the thickness of the first type of material layer ranges from 0.24 mm to 0.32 mm. Exemplarily, the thickness of the first type of material layer ranges from 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, 0.30 mm, 0.31 mm, 0.32 mm, and any value between the above two values.

[0051] It should be noted that the first type of material layer is relatively thick. By placing the first type of material layer on both sides of the second type of material layer, the first type of material layer plays an effective buffering role when the stamping die stamps the composite strip, which helps to protect the second type of material layer.

[0052] In some embodiments of this application, the second type of material layer may be an amorphous alloy strip.

[0053] Understandably, amorphous alloy strips possess excellent soft magnetic properties, high maximum permeability, low coercivity, and low iron loss. The strength of amorphous alloy strips is 3 to 4 times that of silicon steel strips. Incorporating amorphous alloy strips as part of composite strips helps to improve the strength of composite strips while reducing their iron loss.

[0054] In some embodiments of this application, the thickness of the second type of material layer can range from 0.025 mm to 0.028 mm. For example, the thickness of the second type of material layer can be 0.025 mm, 0.026 mm, 0.027 mm, 0.028 mm, or any value between these two values. A thinner second type of material layer is beneficial for reducing the overall thickness of the composite strip, thus preventing an increase in iron loss in the core due to excessive thickness of the composite strip.

[0055] In some embodiments of this application, the saturation magnetic induction intensity of the composite strip is greater than or equal to 1.7T.

[0056] In some embodiments of this application, the saturation magnetic induction intensity of the composite strip is 1.7T to 1.8T. The higher the saturation magnetic induction intensity, the more beneficial it is to achieving the trend of high-speed motors. Furthermore, the saturation magnetic induction intensity of the composite strip can be any value between 1.7T and 1.8T.

[0057] It should be noted that Tesla is the unit of saturation magnetic flux density, abbreviated as T.

[0058] It is understandable that the lamination factor = (total thickness of composite strip - thickness of adhesive layer) / total thickness of composite strip. Since the thickness of silicon steel strip is relatively large, including silicon steel strip as part of composite strip helps to improve the lamination factor of composite strip.

[0059] In some embodiments of this application, the stacking factor of the composite strip can be from 0.95 to 0.98.

[0060] It is understandable that the lamination factor of composite strip is between 0.95 and 0.98. The lamination factor in this range is relatively large, which helps to increase the effective area of ​​the iron core of subsequent products, thereby improving the efficiency of the motor.

[0061] In some embodiments of this application, the lamination factor of the composite strip can be from 0.95 to 0.96. Exemplarily, the lamination factor of the composite strip can be 0.95, 0.96, 0.97, 0.98, or any value between the two aforementioned values.

[0062] In some embodiments of this application, the ratio of the iron loss of the composite strip to the iron loss of the silicon steel core is 0.5 to 0.75. Exemplarily, the iron loss of the composite strip can be 50% of the iron loss of the silicon steel core, or the iron loss of the composite strip can be 60% of the iron loss of the silicon steel core, or the iron loss of the composite strip can be 75% of the iron loss of the silicon steel core.

[0063] It is understood that the composite strip of this application has lower iron loss compared with silicon steel core. Therefore, the ratio of iron loss of composite strip to iron loss of silicon steel core is small, and eddy current loss can be significantly reduced.

[0064] In some embodiments of this application, the adhesive layer may be an epoxy adhesive layer.

[0065] In some embodiments of this application, the thickness of the adhesive layer ranges from, but is not limited to, 1 μm to 3 μm. Exemplarily, the thickness of the adhesive layer can be 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm, 3.0 μm, or any value between the two aforementioned values.

[0066] It should be noted that the adhesive layer is thicker than the first and second material layers, which is more conducive to bonding the first and second material layers tightly together.

[0067] In some embodiments of this application, the total thickness of the composite strip is less than or equal to 2 mm.

[0068] It should be noted that the total thickness of the composite strip refers to the sum of the thicknesses of the first type of material layer, the second type of material layer, and the adhesive layer.

[0069] In some embodiments of this application, the total thickness of the composite strip ranges from 0.5 mm to 2 mm. For example, the total thickness of the composite strip is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, or any value between two of the above. A total thickness of 0.5 mm to 2 mm facilitates easier stamping of the composite strip.

[0070] In some embodiments of this application, the viscosity of the adhesive layer is less than 1000 centipoise. The viscosity of the adhesive layer should not be too high. If the viscosity of the adhesive layer exceeds 1000 centipoise, it will affect the leveling properties of the epoxy adhesive, making it difficult for the epoxy adhesive to spread between the first type of material layers and between the first type of material layer and the second type of material layer.

[0071] In some embodiments of this application, the viscosity of the adhesive layer is less than 500 centipoise. The lower the viscosity of the adhesive layer, the more favorable it is for the epoxy adhesive to spread on the surface of the first type of material layer and / or the second type of material layer.

[0072] It should be noted that the viscosity of the adhesive layer refers to the viscosity of the adhesive layer in the liquid phase. Viscosity is used to quantify the degree of viscosity of the adhesive layer in the liquid phase.

[0073] In some embodiments of this application, the hardness of the adhesive layer is greater than 50 Shore D.

[0074] It should be noted that the hardness of the adhesive layer is obtained by testing the layered structure formed after the liquid phase of the adhesive layer has been cured.

[0075] It should be noted that Shore D is a standard used to measure the hardness of relatively hard materials, hereinafter referred to as Shore D.

[0076] In some embodiments of this application, the hardness of the adhesive layer ranges from 52 shore D to 80 D. Exemplarily, the hardness of the adhesive layer is 55 shore D, 58 shore D, 60 shore D, 62 shore D, 65 shore D, 68 shore D, 70 shore D, 72 shore D, 75 shore D, 80 shore D, and values ​​between the above two values.

[0077] In some embodiments of this application, the hardness of the adhesive layer ranges from 80 shore D to 200 shore D. Exemplarily, the hardness of the adhesive layer is 80 shore D, 85 shore D, 90 shore D, 95 shore D, 100 shore D, 110 shore D, 120 shore D, 130 shore D, 140 shore D, 150 shore D, 160 shore D, 170 shore D, 180 shore D, 190 shore D, 200 shore D, and any value between the two aforementioned values.

[0078] In an exemplary embodiment, epoxy adhesive is used as an example for illustration. The hardness of the adhesive layer is related to the stamping burrs on the surface of the composite strip after stamping. The greater the hardness of the adhesive layer, the faster the composite strip can be broken during stamping. Conversely, if the hardness of the adhesive layer is too low, the composite strip cannot be broken during stamping.

[0079] It should be further explained that the first type of wetting angle is the contact angle of the epoxy adhesive on the surface of the silicon steel strip. The first type of wetting angle is used to indicate the degree of wetting of the epoxy adhesive on the surface of the silicon steel strip.

[0080] It should be further explained that the second type of wetting angle is the contact angle of epoxy adhesive on the surface of amorphous alloy strip. The second type of wetting angle is used to indicate the degree of wetting of epoxy adhesive on the surface of amorphous alloy strip.

[0081] In some embodiments of this application, the value of the first type of wetting angle is greater than or equal to 35° and less than 90°. Further, the value of the first type of wetting angle is greater than or equal to 40° and less than or equal to 60°. Exemplarily, the value of the first type of wetting angle can be 40°, 42°, 45°, 48°, 50°, 52°, 55°, 58°, 60°, or any value between the above two values.

[0082] It is understandable that the larger the first type of wetting angle, the more beneficial it is for the adhesive layer to wet the surface of the first type of material layer in the liquid phase.

[0083] In some embodiments of this application, the value of the second type of wetting angle ranges from 5° to 25°. Further, the value of the second type of wetting angle ranges from 8° to 20°. Exemplarily, the value of the second type of wetting angle can be 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, or any value between the above two values. It is understood that a smaller second type of wetting angle is less conducive to the wetting of the adhesive layer with the surface of the second type of material layer in the liquid phase.

[0084] It should be noted that the ratio of the first type of wetting angle to the second type of wetting angle is related to the ease of peeling. For example, the larger the ratio of the first type of wetting angle to the second type of wetting angle, the more significant the first type of wetting angle is compared to the second type of wetting angle. This helps to create greater separation between the first type of material layer and the epoxy adhesive, thus providing a certain release effect and making it easier to peel off.

[0085] In some embodiments of this application, the ratio of the first type of wetting angle to the second type of wetting angle can be greater than or less than 2, and less than or equal to 7.5. For example, the ratio of the first type of wetting angle to the second type of wetting angle can be 2, 2.2, 2.5, 3.2, 3.6, 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 5.75, 6, 6.25, 6.5, 6.7, 7, 7.3, 7.5, or any value between the two values ​​mentioned above.

[0086] In an exemplary embodiment, the epoxy adhesive has a large wetting angle on the surface of the silicon steel strip and a small wetting angle on the surface of the amorphous alloy strip. When the composite strip roll is peeled into composite strips, it is beneficial to peel the silicon steel strips together, so that the peeled composite strip is a sandwich composite structure. The composite strip is then stamped using a stamping die to obtain composite laminations. The motor core is obtained by stacking the composite laminations.

[0087] Secondly, embodiments of this application provide a method for preparing a composite strip. The following describes the method using an example where the first material layer is a silicon steel strip, the second material layer is an amorphous alloy strip, and the adhesive layer is in the liquid phase state of epoxy adhesive. The method specifically includes the following steps:

[0088] S100. Silicon steel strip, amorphous alloy strip, and silicon steel strip are initially combined through a winding process to obtain an initial composite coil.

[0089] S200. Immerse the initial composite roll material in epoxy adhesive with a viscosity of 50 centipoise to 500 centipoise. After the epoxy adhesive cures, the composite strip roll is obtained.

[0090] S300. The composite strip is unwound using a winding device to obtain the composite strip.

[0091] In some embodiments of this application, in step S100, there is a gap between the silicon steel strip and the amorphous alloy strip so that the epoxy adhesive can be fully spread between the silicon steel strip and the amorphous alloy strip.

[0092] In some embodiments of this application, in step S100, the winding tension is greater than or equal to 10N. For example, in step S100, the winding tension can be 10N, 15N, or 20N.

[0093] Figure 3 illustrates the initial state of multiple material layers after initial winding. As shown in Figure 3, after the initial composite roll is wound, the silicon steel strips are arranged adjacent to each other. Due to the large wetting angle of the epoxy adhesive on the surface of the silicon steel strip, there is greater separation between the epoxy adhesive and the silicon steel strip, making it easier to peel off. This helps prevent the amorphous alloy strip from cracking due to peeling.

[0094] In some embodiments of this application, in step S200, the viscosity of the epoxy adhesive is 50 to 500 centipoise. Further, a viscosity of 50 to 200 centipoise is beneficial for the full spreading of the epoxy adhesive.

[0095] In some embodiments of this application, in step S300, the peel tension is greater than or equal to 10N. Further, the peel tension in step S300 may be the same as the winding tension in step S100.

[0096] Thirdly, embodiments of this application provide an iron core comprising the aforementioned composite strip.

[0097] In some embodiments of this application, the iron core is formed by stamping the aforementioned composite strip using a stamping die to obtain composite laminations, which are then stacked to form the iron core. The iron core of the embodiments of this application has low iron loss, high strength, and high saturation magnetic induction intensity.

[0098] Fourthly, embodiments of this application provide an electric motor, including the aforementioned composite strip or the aforementioned iron core. The electric motor of this application embodiment has high efficiency; by increasing the frequency, high speed, high power density, or high torque density of the motor can be achieved.

[0099] The present application will be specifically described below through specific embodiments. These embodiments are only some embodiments of the present application and are not intended to limit the present application. Unless otherwise specified, the raw materials used in the following embodiments are all commercially available products.

[0100] Example 1:

[0101] A composite strip includes silicon steel strip and amorphous alloy strip. The silicon steel strip comprises two layers, and the amorphous alloy strip comprises three layers, with the three layers sandwiched between the two silicon steel strips. Adhesive layers are present between adjacent amorphous alloy strips and between silicon steel strips and amorphous alloy strips. In this embodiment, the thickness of the silicon steel strip is 0.2 mm, and the thickness of the amorphous alloy strip is 0.028 mm. The adhesive layers are cured using epoxy resin adhesive with a viscosity of 300 cps to 500 cps and a hardness of 80 Shore D. The wetting angle of the epoxy resin adhesive on the surface of the amorphous alloy strip is 20°, and the wetting angle of the epoxy resin adhesive on the surface of the silicon steel strip is 40°, meaning the ratio of the wetting angle of the epoxy resin adhesive on the surface of the silicon steel strip to the wetting angle of the epoxy resin adhesive on the surface of the amorphous alloy strip is 2. The total thickness of the composite strip is 0.504 mm.

[0102] Example 2:

[0103] A composite strip includes silicon steel strip and amorphous alloy strip. The difference between this embodiment and Embodiment 1 is that the number of silicon steel strip layers is 2, and the number of amorphous alloy strip layers is 10. The specific structure of the composite strip is silicon steel strip - amorphous alloy strip - amorphous alloy strip - amorphous alloy strip - silicon steel strip. The thickness of the silicon steel strip is 0.25 mm, the thickness of the amorphous alloy strip is 0.025 mm, and the total thickness of the composite strip in this embodiment is 0.75 mm.

[0104] Example 3:

[0105] A composite strip includes silicon steel strip and amorphous alloy strip. The difference between this embodiment and Embodiment 1 is that the number of silicon steel strip layers is 2, and the number of amorphous alloy strip layers is 5. The specific structure of the composite strip is silicon steel strip - amorphous alloy strip - amorphous alloy strip - amorphous alloy strip - silicon steel strip. The thickness of the silicon steel strip is 0.3 mm, the thickness of the amorphous alloy strip is 0.026 mm, and the total thickness of the composite strip in this embodiment is 0.73 mm.

[0106] Comparative Example 1:

[0107] A composite strip includes a silicon steel strip and an amorphous alloy strip. The difference between this comparative example and Example 1 is that the epoxy resin adhesive has a viscosity of 800 cps and a hardness of 50 Shore D. The wetting angle of the epoxy resin adhesive on the amorphous alloy strip surface is 28.5°, and the wetting angle of the epoxy resin adhesive on the silicon steel strip surface is 31°. The ratio of the wetting angle of the epoxy resin adhesive on the silicon steel strip surface to the wetting angle of the epoxy resin adhesive on the amorphous alloy strip surface is 1.1.

[0108] The performance parameters of the composite strip for Examples 1 to 3 are shown in Table 1.

[0109] Table 1

[0110] Based on the performance parameters of Examples 1 to 3, Comparative Example 1, and Table 1, it can be seen that the composite strip of Comparative Example 1 is difficult to peel off, and there is material layer breakage during the peeling process; while the samples of Examples 1 to 3 are easy to peel off, and the peeled composite strip has a high stacking factor. When the iron core prepared using the composite strip of Examples 1 to 3 has low loss and high saturation magnetic induction intensity, it helps to improve the efficiency of the motor.

[0111] The composite strip, iron core, and motor provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A composite strip, comprising: At least two layers of type I material; The second type of material layer is disposed between two adjacent first type of material layers; An adhesive layer is disposed between the first type of material layer and the second type of material layer; The adhesive layer has a first type of wetting angle with the surface of the first type of material layer, and the adhesive layer has a second type of wetting angle with the surface of the second type of material layer; The ratio of the first type of wetting angle to the second type of wetting angle is greater than or equal to 1.4 and less than 18.

2. The composite strip according to claim 1, wherein, The ratio of the first type of wetting angle to the second type of wetting angle is greater than or equal to 2 and less than or equal to 7.

5.

3. The composite strip according to claim 1, wherein, The value range of the first type of wetting angle is greater than or equal to 35° and less than 90°; optionally, the value range of the first type of wetting angle is greater than or equal to 40° and less than or equal to 60°.

4. The composite strip according to claim 1, wherein, The value range of the second type of wetting angle is greater than or equal to 5° and less than or equal to 25°; optionally, the value range of the second type of wetting angle is greater than or equal to 8° and less than or equal to 20°.

5. The composite strip according to claim 1, wherein, The first type of material layer includes silicon steel strip.

6. The composite strip according to claim 1, wherein, The second type of material layer includes amorphous alloy strips.

7. The composite strip according to claim 1, wherein, The stacking factor of the composite strip ranges from 0.95 to 0.

98.

8. The composite strip according to claim 1, wherein, The saturation magnetic induction intensity of the composite strip is 1.7T to 1.8T.

9. The composite strip according to claim 1, wherein, The thickness of the second type of material layer ranges from 0.025 mm to 0.028 mm; and / or the thickness of the first type of material layer ranges from 0.2 mm to 0.35 mm.

10. The composite strip according to claim 1, wherein, The total thickness of the composite strip is less than or equal to 2 mm.

11. The composite strip according to claim 1, wherein, The viscosity of the adhesive layer is less than 1000 centipoise; optionally, the viscosity of the adhesive layer is less than 500 centipoise.

12. The composite strip according to claim 1, wherein, The hardness of the adhesive layer ranges from 50 Shore D to 100 Shore D.

13. A core made of the composite strip as described in any one of claims 1 to 12.

14. An electric motor comprising the iron core as described in claim 13.

Images