Combined magnetic shoe, rotor core and motor

Abstract

The utility model provides a combined magnetic shoe, the combined magnetic shoe comprises a big magnetic shoe and a small magnetic shoe, the big magnetic shoe and the small magnetic shoe are both tile-shaped, the big magnetic shoe is provided with an accommodating hole penetrating through the two ends of the big magnetic shoe, the inner wall surface of the accommodating hole is matched with the outer wall surface of the small magnetic shoe, the small magnetic shoe is arranged in the accommodating hole, and the small magnetic shoe is arranged in the accommodating hole. And a bonding layer is arranged between the large magnetic tile and the small magnetic tile, so that the technical problem that direct connection between the small magnetic tile magnet and the large magnetic tile is not firm in the prior art can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a combined magnetic tile, rotor core and motor. Background Technology

[0002] A permanent magnet tile is a tile-shaped magnet used in electric motors. Unlike electromagnetic motors that generate a magnetomotive force source through excitation coils, permanent magnet motors generate a constant magnetomotive force source using permanent magnet materials. Permanent magnet tiles offer advantages such as simple motor structure, light weight, small size, reliable operation, low copper usage, low copper consumption, and low energy consumption. However, most existing permanent magnet tiles are made from a single material, either iron oxide or permanent magnet. While iron oxide is inexpensive, its performance is relatively low, resulting in a larger motor size. Permanent magnets, while having higher performance, are expensive, increasing the production cost of permanent magnet tiles. This also leads to magnetic energy waste and magnetic interference with external equipment, reducing the overall performance of the permanent magnet tile.

[0003] In existing technologies, such as the patent CN207518363U, a combined tile-shaped magnet is disclosed. The inner and outer magnets of this tile-shaped magnet are fixed by a snap-fit ​​structure, which is complex to manufacture and inefficient. Due to thermal expansion and contraction, the connection between the inner and outer magnets may be weak, or significant compressive force may occur between the outer and inner magnets. Improving the strength of the connection between the inner and outer magnets is a pressing technical problem that needs to be solved. Utility Model Content

[0004] Therefore, this utility model provides a combination of magnetic tiles, rotor core and motor, which can solve the technical problem of weak direct connection between small magnetic tiles and large magnetic tiles in the prior art.

[0005] In a first aspect, this utility model provides a combined magnetic tile, which includes a large magnetic tile and a small magnetic tile. Both the large magnetic tile and the small magnetic tile are tile-shaped. The large magnetic tile is provided with a receiving hole that extends through both ends of itself. The inner wall surface of the receiving hole is adapted to the outer wall surface of the small magnetic tile. The small magnetic tile is disposed in the receiving hole. An adhesive layer is provided between the large magnetic tile and the small magnetic tile.

[0006] In some embodiments, only one receiving hole is provided on the large magnetic tile, and only one small magnetic tile is provided in the receiving hole.

[0007] In some embodiments, both curved surfaces of the large magnetic tile are circular, namely an outer large circular surface and an inner large circular surface; and / or, both curved surfaces of the small magnetic tile are circular, namely an outer small circular surface and an inner small circular surface.

[0008] In some embodiments, the radius of the inner small circular surface is less than or equal to the radius of the inner large circular surface.

[0009] In some embodiments, the radius of the outer small circular surface is greater than or equal to the radius of the outer large circular surface.

[0010] In some embodiments, the bending direction of the small magnetic tile is the same as or opposite to the bending direction of the large magnetic tile.

[0011] In some embodiments, the magnetic field strength generated by the small magnetic tile is greater than that of the large magnetic tile.

[0012] Secondly, this utility model also provides a rotor core, comprising a plurality of the aforementioned combined magnetic tiles, wherein the plurality of the combined magnetic tiles are combined into a circle.

[0013] In some embodiments, in the circumferential direction of the rotor core, a first snap-fit ​​structure and a second snap-fit ​​structure are respectively provided at both ends of the large magnetic tile, and the first snap-fit ​​structure of one of the two adjacent large magnetic tiles is snapped into each other with the second snap-fit ​​structure of the other large magnetic tile.

[0014] Thirdly, this utility model provides an electric motor, including the aforementioned rotor core.

[0015] This invention improves the efficiency of assembling composite magnetic tiles by setting an adhesive layer between the small and large magnetic tiles, which bonds the large and small magnetic tiles together. The adhesive layer has a certain degree of toughness, which avoids the phenomenon of direct contact and damage between the large and small magnetic tiles when they expand and contract with heat, thus improving the safety and stability of the composite magnetic tiles. Attached Figure Description

[0016] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 This is an axial schematic diagram of the rotor core according to an embodiment of the present invention;

[0018] Figure 2 This is a perspective view of the combined magnetic tile according to an embodiment of the present invention;

[0019] Figure 3 This is an axial schematic diagram of the combined magnetic tile according to an embodiment of the present invention;

[0020] Figure 4 This is a perspective view of the large magnetic tile according to an embodiment of this utility model;

[0021] Figure 5 This is an axial schematic diagram of the large magnetic tile according to an embodiment of this utility model;

[0022] Figure 6 This is an embodiment of the present utility model. Figure 5 The left view;

[0023] Figure 7 This is a perspective view of the small magnetic tile according to an embodiment of this utility model;

[0024] Figure 8 This is an axial schematic diagram of the small magnetic tile according to an embodiment of the present invention;

[0025] Figure 9 This is an embodiment of the present utility model. Figure 8 A bottom view;

[0026] Figure 10 This is an embodiment of the present utility model. Figure 8 The left view;

[0027] Figure 11 This is a schematic diagram of the magnetic field strength waveform distribution generated by the combined magnetic tiles according to an embodiment of this utility model;

[0028] Figure 12 This is a schematic diagram of the magnetic field strength waveform distribution when two internal magnetic tiles are set in the existing technology;

[0029] The attached figures are labeled as follows:

[0030] 1. Large magnetic tile; 2. Small magnetic tile; 3. Receiving hole; 4. Adhesive layer; 501. First snap-fit ​​structure; 502. Second snap-fit ​​structure. Detailed Implementation

[0031] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0033] 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.

[0034] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0035] This invention provides a combination of magnetic tiles, rotor core, and motor, which can solve the technical problem of weak direct connection between inner and outer magnets in the prior art.

[0036] See also Figure 1-11 As shown, a composite magnetic tile includes a large magnetic tile 1 and a small magnetic tile 2. Both the large magnetic tile 1 and the small magnetic tile 2 are tile-shaped. The large magnetic tile 1 is provided with a receiving hole 3 that extends through both ends of itself. The inner wall surface of the receiving hole 3 is adapted to the outer wall surface of the small magnetic tile 2. The small magnetic tile 2 is disposed in the receiving hole 3. An adhesive layer 4 is provided between the large magnetic tile 1 and the small magnetic tile 2.

[0037] Compared to using a snap-fit ​​method to connect the large magnetic tile 1 and the small magnetic tile 2, this application simplifies the processing technology and improves production efficiency by setting an adhesive layer 4 between the large magnetic tile 1 and the small magnetic tile 2, thus bonding them together. Due to the adhesive layer 4, when the combined magnetic tile is heated during operation, the large magnetic tile 1 and the small magnetic tile 2 will inevitably deform (e.g., due to thermal expansion and contraction). The adhesive layer 4 has a certain degree of elasticity; although thin, it provides space for the deformation of the large magnetic tile 1 and the small magnetic tile 2, preventing excessive stress caused by compression between them and thus reducing structural strength. This improves the robustness and operational stability of the combined magnetic tile.

[0038] Furthermore, the adhesive layer 4 is a magnetic structural adhesive, which bonds and fixes the large magnetic tile 1 and the small magnetic tile 2 together, thereby improving the stability of the combined magnetic tile structure. The magnetic structural adhesive has excellent bonding strength and chemical corrosion resistance, ensuring that the magnetic tiles will not detach during long-term use, thus improving stability. This connection method is not only simple to operate but also highly reliable, suitable for various harsh working environments.

[0039] Preferred, such as Figure 2-11 As shown, the large magnetic tile 1 has only one receiving hole 3, and the receiving hole 3 has only one small magnetic tile 2.

[0040] This application simplifies the structure of the combined magnetic tiles and optimizes the magnetic circuit by setting only a small magnetic tile 2 on the large magnetic tile 1.

[0041] like Figure 12 In the prior art, one outer magnetic tile is set with two inner magnetic tiles, and the magnetic field strength waveform distribution is different from that of this application.

[0042] Preferred, such as Figure 2-5 As shown, both curved surfaces of the large magnetic tile 1 are circular, namely the outer large circular surface and the inner large circular surface; and / or, both curved surfaces of the small magnetic tile 2 are circular, namely the outer small circular surface and the inner small circular surface.

[0043] By setting the two curved surfaces of the large magnetic tile 1 as round surfaces and the two curved surfaces of the small magnetic tile 2 as round surfaces, it is beneficial to improve the roundness of the combined magnetic tiles after they are assembled into the rotor core, thereby improving the performance of the rotor core.

[0044] Preferably, the radius of the inner small circular surface is less than or equal to the radius of the inner large circular surface.

[0045] By ensuring that the radius of the inner small circular surface is less than or equal to the radius of the inner large circular surface, it is beneficial to optimize the magnetic circuit and avoid excessive local magnetic flux density.

[0046] Preferably, the radius of the outer small circular surface is greater than or equal to the radius of the outer large circular surface.

[0047] Furthermore, by ensuring that the radius of the outer small circular surface is greater than or equal to the radius of the outer large circular surface, it is beneficial to optimize the magnetic circuit and avoid excessive local magnetic flux density.

[0048] By ensuring that the radius of the inner small circular surface is less than or equal to the radius of the inner large circular surface, or that the radius of the outer small circular surface is greater than or equal to the radius of the outer large circular surface, the magnetic field can be effectively concentrated in a specific area, making the magnetic field in that area more uniform, reducing magnetic field leakage from the magnetic tiles, and thus improving the magnetic field strength and uniformity of the central area.

[0049] Preferably, the bending direction of the small magnetic tile 2 is the same as or opposite to the bending direction of the large magnetic tile 1.

[0050] By making the bending direction of the small magnetic tile 2 the same as or opposite to that of the large magnetic tile 1, the local magnetic circuit on the rotor core becomes more concentrated or more uniform, thus improving the adaptability of the combined magnetic tiles.

[0051] Preferably, the magnetic field strength generated by the small magnetic tile 2 is greater than that generated by the large magnetic tile 1.

[0052] The magnetic field strength of the small magnetic tile 2 is greater than that of the large magnetic tile 1, which is beneficial to improving the output power of the motor.

[0053] Furthermore, the small magnet 2 is made of rare-earth permanent magnet material, while the large magnet 1 is made of ferrite permanent magnet. The small magnet 2 has high remanence, high coercivity, and high energy product. These characteristics enable the small magnet 2 to provide a stronger magnetic field than the large magnet 1, thereby increasing the power output of the motor. The use of rare-earth permanent magnet material in the small magnet 2 can improve the overall performance of the motor, especially in applications requiring high performance and high efficiency; while the use of ferrite material in the large magnet 1 helps to reduce the cost of the motor and provides better stability and durability in specific environments.

[0054] Furthermore, the large magnetic tile 1 and the small magnetic tile 2 are made of iron oxide permanent magnets and neodymium iron boron permanent magnets, respectively. Simultaneously, the large magnetic tile 1 and the small magnetic tile 2 are interconnected by a magnetic steel structural adhesive, reducing the possibility of detachment during use and improving stability. The material combination of the large magnetic tile 1 and the small magnetic tile 2 not only improves the overall performance of the magnetic tile body but also significantly reduces the production cost of the magnetic tile.

[0055] Rare-earth permanent magnet materials possess extremely high remanence (Br) and coercivity (Hc), enabling them to provide strong magnetic field strength. This material selection allows the small magnetic tile 2 to generate a strong magnetic field within a relatively small volume, improving the efficiency and performance of the motor. Changing the width L of the small magnetic tile 2 allows adjustment of the width of the strong magnetic region in the air gap, achieving optimal adjustment of the air gap magnetic field waveform; adjusting the thickness H of the inner magnetic tile according to the motor design requirements can effectively regulate the motor's magnetic field strength.

[0056] The aforementioned selection strategy for permanent magnet materials allows motor manufacturers to flexibly adjust the design according to specific application requirements, achieving the optimal balance between performance and cost-effectiveness. For example, adjusting the thickness of the small magnet tile 2 according to actual needs can increase the central magnetic field strength. Ferrite has a remanence of 0.2–0.5 T, a coercivity of 160–320 kA / m, and a maximum energy product of 1.5–4.0 MGOe; rare-earth permanent magnets have a remanence of 1.0–1.4 T, a coercivity of 790–2390 kA / m, and a maximum energy product of 35–52 MGOe. When the size of the magnet tile body is fixed, by reasonably adjusting the thickness and width of the small magnet tile 2, the remanence of the combined magnet tile can be controlled between 0.5–1.0 T, the coercivity between 320–790 kA / m, and the maximum energy product between 4–35 MGOe.

[0057] The present invention provides a rotor core comprising a plurality of the aforementioned combined magnetic tiles, wherein the plurality of combined magnetic tiles are assembled into a circle.

[0058] Preferably, in the circumferential direction of the rotor core, a first snap-fit ​​structure 501 and a second snap-fit ​​structure 502 are respectively provided at both ends of the large magnetic tile 1, and the first snap-fit ​​structure 501 of one of the two adjacent large magnetic tiles 1 is snapped into the second snap-fit ​​structure 502 of the other large magnetic tile 1.

[0059] By setting the first snap-fit ​​structure 501 and the second snap-fit ​​structure 502, the ease of assembling the magnetic tiles into a circle is improved.

[0060] Furthermore, the first snap-fit ​​structure 501 is a strip-shaped protrusion, and the second snap-fit ​​structure 502 is a groove, with the strip-shaped protrusion able to snap into the groove; even further, the cross-section of the strip-shaped protrusion is rectangular, and the cross-section of the groove is also rectangular; thus, the ease of installation and the stability after installation of the magnetic tile are improved.

[0061] By using strip-shaped protrusions and corresponding grooves for interlocking, multiple combined magnetic tiles (large magnetic tile 1) can be connected, ensuring a stable connection. This design not only simplifies the installation process but also improves the mechanical stability of the magnetic tiles, reduces wear caused by vibration and displacement, and extends the service life of the motor.

[0062] like Figure 2 As shown, the large magnetic tile 1 is made of iron oxide material, while the small magnetic tile 2 is made of rare earth material. Because the small magnetic tile 2 provides stronger magnetic energy, the magnetic field strength waveform distribution exhibits the shape of a single peak.

[0063] This utility model also provides an electric motor, including the rotor core mentioned above.

[0064] The motor has high overall performance and high reliability.

[0065] By adjusting the thickness and width of the small magnet 2 (e.g.) Figure 3 The width shown is L and the thickness is H. This method can efficiently optimize the magnetic field distribution of the motor, thereby finding the optimal point for motor operation. This method avoids the complexity and uncertainty of frequently adjusting the motor windings and stator slots in traditional methods, and provides a more scientific and convenient solution.

[0066] When determining the dimensions of the magnetic tile body, the waveform of the air gap magnetic field of the motor can be significantly improved by reasonably designing and adjusting the thickness and width of the inner magnetic tile, and the magnetic field strength of the motor can be flexibly adjusted.

[0067] Specifically, adjusting the thickness H of the inner magnetic tile according to the motor design requirements can effectively regulate the motor's magnetic field strength. For example, increasing the thickness H of the inner magnetic tile can effectively enhance the motor's magnetic field strength, while decreasing the thickness H can effectively reduce the motor's magnetic field strength. Changing the width L of the inner magnetic tile can adjust the width of the strong magnetic region in the air gap, achieving the goal of optimizing the air gap magnetic field waveform and thus finding the optimal point for motor operation. This method avoids the complexity and uncertainty of frequently adjusting the motor windings and stator slots in traditional methods, providing a more scientific and convenient solution. It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above methods can be freely combined and superimposed.

[0068] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A combined magnet tile comprising a large magnet tile (1) and a small magnet tile (2), each of the large magnet tile (1) and the small magnet tile (2) being tile-shaped, characterized in that, The big magnetic tile (1) is provided with containing holes (3) through both ends of itself, inner wall surfaces of the containing holes (3) are matched with outer wall surfaces of the small magnetic tiles (2), the small magnetic tiles (2) are arranged in the containing holes (3), and an adhesive layer (4) is arranged between the big magnetic tile (1) and the small magnetic tile (2).

2. The combination magnet shoe according to claim 1, wherein, Only one containing hole (3) is arranged on the big magnetic tile (1), and only one small magnetic tile (2) is arranged in the containing hole (3).

3. The combination magnet tile of claim 2, wherein, Both curved surfaces of the big magnetic tile (1) are circular surfaces, which are an outer big circular surface and an inner big circular surface respectively; and / or both curved surfaces of the small magnetic tile (2) are circular surfaces, which are an outer small circular surface and an inner small circular surface respectively.

4. The combination magnet tile of claim 3, wherein, The radius of the inner small circular surface is less than or equal to the radius of the inner big circular surface.

5. The combination magnet tile of claim 3, wherein, The radius of the outer small circular surface is greater than or equal to the radius of the outer big circular surface.

6. The combination magnet tile of claim 1, wherein, The bending direction of the small magnetic tile (2) is the same as or opposite to the bending direction of the big magnetic tile (1).

7. The combination magnet tile according to any one of claims 1-6, wherein, The magnetic field strength generated by the small magnetic tile (2) is greater than the magnetic field strength of the big magnetic tile (1).

8. A rotor core characterized by, A plurality of combined magnetic tiles as claimed in any one of claims 1-7 are combined into a circular shape.

9. The rotor core according to claim 8, characterized by In the circumferential direction of the rotor core, the two ends of the big magnetic tile (1) are respectively provided with a first clamping structure (501) and a second clamping structure (502), and the first clamping structure (501) of one big magnetic tile (1) in the two adjacent big magnetic tiles (1) and the second clamping structure (502) of the other big magnetic tile (1) are clamped to each other.

10. An electric machine characterized by The rotor core as claimed in any one of claims 8-9 is included.

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