Stator core and motor

Abstract

The embodiment of the invention provides a stator core and a motor, and the stator core comprises an iron core inner ring which is of an amorphous material structure; the iron core outer ring is made of a silicon steel material; the iron core outer ring is arranged on the periphery of the iron core inner ring in a sleeving mode. The structure that the iron core inner ring and the iron core outer ring are sleeved inside and outside in the radial direction is adopted, the iron core inner ring is made of an amorphous material, and the iron core outer ring is made of a silicon steel material, so that the motor loss can be reduced by utilizing the low iron loss characteristic of the amorphous material, and the peak capacity of the motor is improved by utilizing the high saturation magnetic induction characteristic of the silicon steel material; and the low magnetostrictive effect of the silicon steel material is utilized to reduce the noise in the operation process of the motor.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a stator core and a motor. Background Art

[0002] With the development of new materials, amorphous materials have been gradually applied to automotive motors. Based on the ultra-thin and low iron loss characteristics of amorphous materials, motor losses can be greatly reduced, motor operating efficiency can be improved, and vehicle energy consumption can be reduced. However, existing amorphous materials often have low saturation magnetic induction, resulting in poor peak capacity, which makes it difficult to meet the high torque density requirements of automotive motors. In addition, amorphous materials have obvious magnetostrictive effects, and noise problems are more serious than those of silicon steel motors. However, traditional amorphous materials have low saturation magnetic induction, weak peak capacity, and noise problems caused by significant magnetostrictive effects, which limit their widespread application in high-performance automotive motors. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a stator core and a motor that can solve the problems of low peak output capacity and high noise performance in existing amorphous material motors.

[0004] On the one hand, an embodiment of the present application provides a stator core, comprising:

[0005] The inner ring of the core is made of amorphous material;

[0006] The outer ring of the iron core is made of silicon steel; the outer ring of the iron core is sleeved on the outer periphery of the inner ring of the iron core.

[0007] In the above implementation process, a radial inner and outer core structure is adopted, the inner core is made of amorphous material, and the outer core is made of silicon steel, which can reduce the motor loss by utilizing the low iron loss characteristics of amorphous material, and at the same time improve the peak capacity of the motor by utilizing the high saturation magnetic induction characteristics of silicon steel, and reduce the noise problem during the operation of the motor by utilizing the lower magnetostrictive effect of silicon steel. In the specific structure, the stator core is the area with the largest iron loss. The inner core of this scheme is made of amorphous material, and most of the core area is amorphous material that is not easy to lose, which can achieve the most effective reduction of motor loss. The outer core is made of silicon steel, which can improve the saturation magnetic sensitivity of the entire stator core as a whole, thereby achieving the purpose of improving the peak output capacity of the motor. In addition, amorphous materials have the characteristics of thinness and brittleness, and are more sensitive when assembled with the motor housing. The outer core of silicon steel can just protect the inner core of amorphous material, and achieve the beneficial effect of improving the processing resistance of the applied motor. The outer ring of the iron core sleeved outside the inner ring of the iron core has a lower magnetostrictive effect and better stability, which can improve the stability of the entire stator core and alleviate the vibration problem caused by the magnetostrictive effect during the operation of the motor.

[0008] In some embodiments, the core inner ring includes an inner ring yoke and stator teeth, and the stator teeth are connected to the inner circumference of the inner ring yoke.

[0009] In the above implementation process, the inner ring choke part serves as the main part of the inner ring of the stator core. Its main function is to support and fix the stator teeth, and as an important component of the electromagnetic path, the stator teeth and the inner ring choke part are an integrated amorphous structure, and the reliability of the connection between the two is better, which can provide the most reliable support for the stator teeth and ensure the reliability of the entire stator core structure.

[0010] In some embodiments, the radial thickness of the outer ring of the core is smaller than the radial thickness of the inner ring choke.

[0011] The thinner outer ring of the iron core can allow the motor to maintain a certain peak output capacity while not increasing unnecessary iron losses due to the outer ring being too thick. This can find a balance between peak capacity and energy efficiency, meeting the dual needs of automotive motors for high performance and low losses.

[0012] In some embodiments, a plurality of damping holes are distributed on the circumference of the outer ring of the core, and the extension direction of the damping holes is parallel to the axial direction.

[0013] In the above implementation process, damping holes are set on the outer ring of the core. The damping holes can change the transmission path of the stator core vibration, improve the overall damping of the motor, weaken the vibration excitation from the stator core to the motor housing, and further achieve the effect of reducing the overall peak noise.

[0014] In some embodiments, the damping hole is filled with a damping medium; or, the inner wall of the damping hole is coated with a damping medium.

[0015] Filling a specific damping medium into the damping holes or coating the inner walls of the damping holes can make these holes become "soft" connection points. When the vibration wave passes through, the damping medium will absorb and dissipate part of the vibration energy. This damping medium usually has a high internal damping ratio and can provide effective damping effect in a wider frequency range.

[0016] In some embodiments, in a radial cross section, the damping hole is arranged in a V-shape, and the tip of the V-shaped corner points to or faces away from the axis of the stator core.

[0017] Setting the damping hole in a V-shape helps guide the vibration wave to gradually change direction during propagation. Since the V-shaped design increases the spatial complexity and surface area inside the damping hole, it can more effectively absorb and dissipate vibration energy. The V-shaped corner of the damping hole points to or away from the axis of the stator core, that is, the V-shaped opening points away from or toward the axis.

[0018] In some embodiments, each of the damping holes includes two strip holes, which are arranged at an angle to each other to form a V-shaped damping hole; and the width of the strip hole gradually increases from the V-shaped corner tip to the V-shaped opening end point.

[0019] The strip holes with increasing width can guide the vibration waves to gradually diffuse and attenuate during the propagation process. When the vibration waves enter the damping holes, they will be restricted to a certain extent at the narrow entrance, and then gradually diffuse in the hole as the width increases. This diffusion process helps to reduce the amplitude and propagation speed of the vibration waves, thereby reducing the vibration energy transmitted to the motor housing and the surrounding environment.

[0020] In some embodiments, each of the damping holes includes a plurality of small holes that are spaced apart and distributed in a V-shape, and the width of the small holes gradually increases in a direction extending from the tip of the V-shaped corner to the end point of the V-shaped opening.

[0021] Likewise, the damping holes of this embodiment are arranged in such a manner that the aforementioned effects of diffusion and vibration transmission reduction can be achieved.

[0022] In some embodiments, the area clamped by the extension lines extending outward in the radial direction from the edges of both sides of the stator teeth is area A, and the damping hole is arranged in the area A; an arc E is drawn with the axis of the stator core as the center, and the arc E passes through the V-shaped opening end points of the damping hole. The distance between the two V-shaped opening end points of the damping hole is L1, and the width of the position of the arc E in area A corresponding to the position is L2, wherein L1≤L2 / 2.

[0023] In the above implementation process, the damping holes are deliberately arranged in the A zone. Such a layout design is intended to ensure that the damping holes can effectively play their damping and vibration reduction functions without affecting the main magnetic flux path of the stator core. In addition, the overall width L1 of the damping holes in the circumferential direction is set to be less than half of the width L2 of the A zone, which can avoid the problem of a significant impact on the magnetic flux path of the stator outer ring.

[0024] In some embodiments, the distance between the V-shaped corner tip of the damping hole and the arc E is D1, the radial thickness of the outer ring of the core is D2, and D1≤D2 / 2.

[0025] Similarly, by setting the overall radial width D1 of the damping hole to be less than half of the radial thickness D2 of the outer ring of the core, the problem of a significant impact on the magnetic flux path of the stator outer ring can be avoided.

[0026] In some embodiments, it includes a core body and a core end plate, the core body includes the core inner ring and the core outer ring, and in the axial direction, one core end plate is respectively provided on both end surfaces of the core body.

[0027] In the above implementation process, core end plates are respectively provided at both end surfaces of the stator core in the axial direction to protect the two end surfaces of the core body and improve the durability of the entire stator core.

[0028] On the other hand, an embodiment of the present application further provides a motor, comprising the above-mentioned stator core.

[0029] In the above implementation process, the above stator core is adopted, and the motor of this embodiment has the advantages of low loss, higher peak performance and better noise performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A radial cross-sectional view of one eighth of a period of the stator core according to an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the radial thickness of the stator core according to the embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the dimensions of the damping holes of the stator core according to the embodiment of the present application;

[0034] Figure 4 A schematic diagram of another arrangement of the damping holes of the stator core according to an embodiment of the present application;

[0035] Figure 5 This is an axial cross-sectional view of the stator core described in an embodiment of the present application.

[0036] Among them, 1. inner ring of the core; 11. stator teeth; 12. inner ring choke; 2. outer ring of the core; 21. damping hole; 3. end plate of the core. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] Reference Figure 1 , an embodiment of the present application provides a stator core, comprising:

[0040] The inner ring 1 of the core is made of amorphous material;

[0041] The core outer ring 2 is made of silicon steel; the core outer ring 2 is sleeved on the outer periphery of the core inner ring 1 .

[0042] Specifically, a structure of an inner core ring 1 and an outer core ring 2 arranged radially inside and outside is adopted, wherein the inner core ring 1 is made of amorphous material and the outer core ring 2 is made of silicon steel. This can reduce the motor loss by utilizing the low iron loss characteristics of amorphous material, and at the same time improve the peak capacity of the motor by utilizing the high saturation magnetic induction characteristics of silicon steel material, and reduce the noise problem during the operation of the motor by utilizing the lower magnetostrictive effect of silicon steel material. In the specific structure, the stator core is the area with the highest iron loss ratio. The inner core ring 1 of this scheme is made of amorphous material to achieve the most effective reduction of motor loss. The outer core ring 2 is made of silicon steel, and the higher saturation magnetic density characteristics of silicon steel can be utilized to achieve the purpose of improving the peak output capacity of the motor. In addition, amorphous materials have the characteristics of being thin and brittle, and are more sensitive when assembled with the motor housing. The outer core ring 2 made of silicon steel can just protect the inner core ring 1 made of amorphous material, and achieve the beneficial effect of improving the processing resistance of the applied motor. The iron core outer ring 2 sleeved outside the iron core inner ring 1 has a lower magnetostrictive effect and better stability, which can improve the stability of the entire stator iron core and alleviate the vibration problem caused by the magnetostrictive effect during the operation of the motor.

[0043] In some embodiments, the core inner ring 1 includes an inner ring choke portion 12 and stator teeth 11 , and the stator teeth 11 are connected to the inner circumference of the inner ring choke portion 12 .

[0044] Specifically, the inner ring choke 12 serves as the main part of the stator core inner ring 1, and its main function is to support and fix the stator teeth 11. As an important component of the electromagnetic path, the stator teeth 11 and the inner ring choke 12 are an integrated amorphous structure, and the reliability of the connection between the two is better, which can provide the most reliable support for the stator teeth 11 and ensure the reliability of the entire stator core structure.

[0045] In some embodiments, reference Figure 2 The radial thickness D2 of the core outer ring 2 is smaller than the radial thickness D3 of the inner ring choke portion 12 .

[0046] The thinner outer ring 2 of the core can make the motor maintain a certain peak output capacity without increasing unnecessary iron loss due to the excessive thickness of the outer ring, so that a balance can be found between peak capacity and energy efficiency, meeting the dual needs of high performance and low loss for automotive motors. Specifically, the larger D3 is, the stronger the anti-loss ability of the stator core is, and the larger D2 is, the stronger the peak capacity of the stator core is, so the appropriate ratio of D2 to D3 can be selected according to the needs of the specific motor application scenario.

[0047] In some embodiments, a plurality of damping holes 21 are distributed circumferentially on the core outer ring 2 , and the extending direction of the damping holes 21 is parallel to the axial direction.

[0048] Specifically, the damping holes 21 provided effectively increase the damping characteristics of the stator core by changing the vibration mode of the core and the transmission path of the vibration energy. When the motor is running, the generated vibration wave will encounter the damping holes 21 when propagating in the core, which helps to reduce the amount of vibration energy transmitted to the motor housing and the surrounding environment, thereby reducing the peak noise of the motor. By reasonably designing the number, size and distribution position of the damping holes 21, vibrations of specific frequencies can be suppressed in a targeted manner, which helps to eliminate or weaken the resonance phenomenon during the operation of the motor, making the acoustic performance of the motor more stable and superior.

[0049] In some embodiments, the damping hole 21 is filled with a damping medium; or, the inner wall of the damping hole 21 is coated with a damping medium.

[0050] Filling a specific damping medium into the damping holes 21 or coating the inner walls of the damping holes 21 can make these holes become "soft" connection points. When the vibration wave passes through, the damping medium will absorb and dissipate part of the vibration energy. This damping medium usually has a high internal damping ratio and can provide effective damping effect in a wider frequency range.

[0051] Optionally, the damping medium is a polymer, rubber, viscous liquid or other material with high damping performance.

[0052] In some embodiments, reference Figure 1 In the radial cross section, the damping hole 21 is arranged in a V-shape, and the tip of the V-shaped corner points to or faces away from the axis of the stator core.

[0053] Specifically, Figure 1 Taking the state shown as an example, the V-shaped sharp corners of the top two damping holes 21 are arranged to face away from the axis of the stator core; the V-shaped sharp corners of the bottom three damping holes 21 are arranged to face toward the axis of the stator core.

[0054] Setting the damping hole 21 in a V-shape helps guide the vibration wave to gradually change direction during propagation, and since the V-shaped design increases the spatial complexity and surface area inside the damping hole 21, it can more effectively absorb and dissipate vibration energy. The V-shaped corner tip of the damping hole 21 points to or faces away from the axis of the stator core, that is, the V-shaped opening faces away from or toward the axis.

[0055] In some embodiments, reference Figure 1 Each of the damping holes 21 includes two strip holes, which are arranged at an angle to each other to form a V-shaped damping hole 21; and the width of the strip hole gradually increases from the V-shaped corner tip to the V-shaped opening end point.

[0056] Specifically, the strip-shaped holes with gradually increasing width can guide the vibration waves to gradually diffuse and attenuate during the propagation process. When the vibration waves enter the damping hole 21, they will be restricted to a certain extent at the narrow entrance, and then gradually diffuse in the hole as the width increases. This diffusion process helps to reduce the amplitude and propagation speed of the vibration waves, thereby reducing the vibration energy transmitted to the motor housing and the surrounding environment.

[0057] In some embodiments, reference Figure 4 Each of the damping holes 21 includes a plurality of small holes that are spaced apart and distributed in a V-shape, and the width of the small holes gradually increases in the direction extending from the V-shaped corner tip to the V-shaped opening end point.

[0058] Likewise, the arrangement of the damping holes 21 of this embodiment can achieve the aforementioned effects of diffusion and weakening vibration transmission.

[0059] In some embodiments, reference Figure 3 , the area clamped by the extension line M extending outward in the radial direction from the edges of both sides of the stator tooth 11 is area A, and the damping hole 21 is arranged in the area A; an arc E is drawn with the axis of the stator core as the center, and the arc E passes through the V-shaped opening end point of the damping hole 21, and the distance between the two V-shaped opening end points of the damping hole 21 is L1, and the width of the position of the arc E in area A corresponding to the position is L2, wherein L1≤L2 / 2.

[0060] In the above implementation process, the damping hole 21 is deliberately arranged in the A zone. Such a layout design is intended to ensure that the damping hole 21 can effectively exert its damping and vibration reduction effects without affecting the main magnetic flux path of the stator core. In addition, the overall width L1 of the damping hole 21 in the circumferential direction is set to be less than half of the width L2 of the A zone, which can avoid the problem of a significant impact on the magnetic flux path of the stator outer ring.

[0061] In some embodiments, the distance between the V-shaped corner tip of the damping hole 21 and the arc E is D1, the radial thickness of the core outer ring 2 is D2, and D1≤D2 / 2.

[0062] Similarly, by setting the overall radial width D1 of the damping hole 21 to be less than half of the radial thickness D2 of the core outer ring 2, the problem of a significant impact on the magnetic flux path of the stator outer ring can be avoided.

[0063] In some embodiments, reference Figure 5 The stator core includes a core body and a core end plate 3. The core body includes the core inner ring 1 and the core outer ring 2. In the axial direction, the two end surfaces of the core body are respectively provided with a core end plate 3.

[0064] In the above implementation process, the core end plates 3 are respectively provided at the two end surfaces of the stator core in the axial direction to protect the two end surfaces of the core body and improve the durability of the entire stator core.

[0065] During specific production, in one embodiment, the core inner ring 1, the core outer ring 2 and the core end plate 3 can be processed separately. The radial thickness of the core end plate 3 is equal to the sum of the radial thicknesses of the core inner ring 1 and the core outer ring 2. After the core inner ring 1 and the core outer ring 2 are sleeved and fixed, the core end plates 3 are fixed on both end surfaces respectively.

[0066] In another embodiment, the core end plate 3 and the core outer ring 2 are also made of silicon steel. The core end plate 3 can be divided into two parts corresponding to the core inner ring 1 and the core outer ring 2 respectively. The part of the core end plate 3 corresponding to the core outer ring 2 is directly formed integrally with the core outer ring 2. After the core inner ring 1 and the core outer ring 2 are sleeved, the part of the core end plate 3 corresponding to the core inner ring 1 is fixed to the two ends of the core inner ring 1 respectively.

[0067] On the other hand, an embodiment of the present application further provides a motor, comprising the above-mentioned stator core.

[0068] In the above implementation process, the above stator core is adopted, and the motor of this embodiment has the advantages of low loss, higher peak performance and better noise performance. The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0069] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A stator core, characterized in that: include: The inner ring of the core is made of amorphous material; The outer ring of the iron core is made of silicon steel; the outer ring of the iron core is sleeved on the outer periphery of the inner ring of the iron core.

2. The stator core according to claim 1, characterized in that: The core inner ring includes an inner ring yoke portion and stator teeth, and the stator teeth are connected to the inner circumference of the inner ring yoke portion.

3. The stator core according to claim 2, characterized in that: The radial thickness of the outer ring of the core is smaller than the radial thickness of the inner ring choke portion.

4. The stator core according to claim 2, characterized in that: A plurality of damping holes are distributed on the circumference of the outer ring of the core, and the extending direction of the damping holes is parallel to the axial direction.

5. The stator core according to claim 4, characterized in that: The damping hole is filled with a damping medium; or the inner wall of the damping hole is coated with a damping medium.

6. The stator core according to claim 4, characterized in that: In the radial cross section, the damping hole is arranged in a V-shape, and the tip of the V-shaped corner points to or faces away from the axis of the stator core.

7. The stator core according to claim 6, characterized in that: Each of the damping holes comprises two strip holes, which are arranged at an angle to each other to form a V-shaped damping hole; and the width of the strip hole gradually increases from the V-shaped corner tip to the V-shaped opening end point.

8. The stator core according to claim 6, characterized in that: Each of the damping holes comprises a plurality of small holes which are arranged at intervals and distributed in a V-shape, and the width of the small holes gradually increases in a direction extending from the V-shaped corner tip to the V-shaped opening end point.

9. The stator core according to claim 6, characterized in that: The area clamped by the extension lines extending outwardly in the radial direction from the edges of both sides of the stator teeth is area A, and the damping hole is arranged in the area A; an arc E is drawn with the axis of the stator core as the center, and the arc E passes through the V-shaped opening end point of the damping hole. The distance between the two V-shaped opening end points of the damping hole is L1, and the width of the position of the arc E in area A corresponding to the position is L2, wherein L1≤L2 / 2.

10. The stator core according to claim 9, characterized in that: The distance between the V-shaped corner tip of the damping hole and the arc E is D1, the radial thickness of the outer ring of the iron core is D2, and D1≤D2 / 2.

11. The stator core according to claim 1, characterized in that: It includes an iron core body and an iron core end plate. The iron core body includes the iron core inner ring and the iron core outer ring. In the axial direction, two end surfaces of the iron core body are respectively provided with an iron core end plate.

12. A motor, characterized in that: It comprises the stator core as described in any one of claims 1-11.

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