Stator core and motor

Abstract

The utility model discloses a stator iron core and a motor, the stator iron core comprises an iron core body and first damping structures arranged on the peripheral surface of the iron core body, and a plurality of first damping structures are arranged along the axial direction of the iron core body at intervals. According to the technical scheme of the utility model, the technical problem that the existing stator core damping structure is poor in vibration and noise reduction effect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor noise, in particular to a stator core and a motor. Background Art

[0002] A motor is an electromagnetic device that realizes the conversion or transmission of electric energy based on electromagnetic induction. Its main function is to generate driving torque as a power source to drive electrical appliances or various mechanical equipment to work. With the development and progress of technology, motors have been widely used in various fields of the national economy. In order to improve the power density and torque density of the motor, higher magnetic loads and electric loads are usually used. Although this will increase the power per unit volume of the motor, it will increase the harmonic content of the air gap magnetic field, thereby causing high-frequency, high-amplitude vibration noise. At present, a damping structure is usually added to the stator core to reduce vibration noise. However, the existing stator core damping structure has poor vibration reduction and noise reduction effect. Utility Model Content

[0003] The main purpose of the utility model is to provide a stator core and a motor, aiming to solve the technical problem that the existing stator core damping structure has poor vibration reduction and noise reduction effect.

[0004] To achieve the above objectives, an embodiment of the utility model provides a stator core, which includes a core body and a first damping structure arranged on the outer peripheral surface of the core body, and a plurality of first damping structures are arranged at intervals along the axial direction of the core body.

[0005] Optionally, in an embodiment of the present utility model, the first damping structure is sleeved with the core body.

[0006] Optionally, in an embodiment of the present invention, a mounting groove is provided on the outer peripheral surface of the core body, and the first damping structure is interference fit with the mounting groove.

[0007] Optionally, in an embodiment of the present invention, the thickness of the first damping structure is between 0.5 mm and 3 mm.

[0008] Optionally, in an embodiment of the present utility model, the stator core further includes a second damping structure, the second damping structure extends along the axial direction of the core body, and two adjacent first damping structures are limited by the second damping structure.

[0009] Optionally, in an embodiment of the present invention, a plurality of the second damping structures are provided at intervals along the circumferential direction of the core body.

[0010] Optionally, in an embodiment of the present invention, the width of the second damping structure is greater than the width of the first damping structure.

[0011] To achieve the above objectives, an embodiment of the utility model provides a motor, which includes a housing and a stator core disposed in the housing, and the stator core is the stator core described above.

[0012] Optionally, in one embodiment of the utility model, the casing includes an inner shell, an outer shell arranged on the outside of the inner shell, and a third damping structure arranged between the inner shell and the outer shell, the third damping structure connects the inner shell and the outer shell, and the first damping structure connects the inner shell and the core body.

[0013] Optionally, in an embodiment of the present utility model, the third damping structure includes a support member and a damping member arranged outside the support member, and the damping member connects the inner shell and the outer shell.

[0014] Compared with the prior art, in a technical solution proposed by the utility model, by setting a first damping structure on the core body, the vibration transmitted from the stator core to the casing can be absorbed, thereby effectively reducing the vibration noise of the casing, alleviating the large vibration displacement and acceleration problems caused by the stator resonance, achieving low vibration and low noise operation of the motor, and improving the quietness and comfort of the motor during operation. Moreover, the first damping structure of the present application is arranged along the axial spacing of the core body. Compared with the radial or circumferential spacing arrangement, the first damping structure arranged axially can be directly installed on the core body through a heat-shrink process. Multiple first damping structures support each other in the circumferential direction of the entire core body, which can achieve a better damping effect and further reduce vibration noise. In addition, the first damping structure arranged axially can also alleviate the vibration stress in the axial direction of the motor and improve the safety of the motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a stator core embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the exploded structure of the stator core embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the housing in the motor embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the housing in the motor embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the exploded structure of the housing in the motor embodiment of the utility model;

[0021] Figure 6 This is the relationship between damping thickness and sound pressure level.

[0022] Description of Figure Numbers:

[0023] Label name Label name 10 Stator core 11 Core body 12 The first damping structure 13 Mounting slot 14 Second damping structure 20 chassis 21 Inner shell 211 First end face 212 Second end face 22 Outer shell 23 The third damping structure 231 Support 232 Damping parts 241 First runner 242 Second flow channel

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0029] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present utility model.

[0030] Motors usually use higher magnetic loads and electrical loads to increase their power density and torque density, but this will increase the harmonic content of the air gap magnetic field, thereby causing high-frequency, high-amplitude vibration noise. The high-frequency vibration noise of motors has become a pain point and common problem in the industry.

[0031] At present, the industry generally focuses on weakening the vibration noise of the motor by weakening the excitation source. Although weakening the electromagnetic force excitation can fundamentally reduce the motor noise level, it will also lead to a decrease in motor torque, power density and efficiency, which will reduce the core competitiveness of the motor.

[0032] Some products also use a damping structure on the stator, but the vibration and noise reduction effect is not good and the installation is not convenient.

[0033] In view of this, an embodiment of the utility model provides a stator core and a motor, wherein the first damping structure is arranged along the axial interval of the core body. Compared with the radial or circumferential interval arrangement, the first damping structure arranged axially can be directly installed on the core body through a shrink-fit process, which is more convenient to install. At the same time, multiple first damping structures support each other in the circumferential direction of the entire core body, which can achieve a better damping effect and further reduce vibration noise. In addition, the first damping structure arranged axially can also alleviate the vibration stress in the axial direction of the motor and improve the safety of the motor operation.

[0034] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 and Figure 2As shown, an embodiment of the utility model provides a stator core. The stator core 10 includes a core body 11 and a first damping structure 12 arranged on the outer peripheral surface of the core body 11 . A plurality of first damping structures 12 are arranged at intervals along the axial direction of the core body 11 .

[0036] In the technical solution adopted in this embodiment, by setting the first damping structure 12 on the core body 11, the vibration transmitted from the stator core 10 to the housing 20 can be absorbed, thereby effectively reducing the vibration noise of the housing 20, alleviating the large vibration displacement and acceleration problems caused by the stator resonance, achieving low vibration and low noise operation of the motor, and improving the quietness and comfort of the motor during operation. Moreover, the first damping structure 12 of the present application is arranged along the axial interval of the core body 11. Compared with the radial or circumferential interval arrangement, the first damping structure 12 arranged axially can be directly installed on the core body 11 through a heat-shrink process. The multiple first damping structures 12 support each other in the circumferential direction of the entire core body 11, which can achieve a better damping effect and further reduce vibration noise. In addition, the first damping structure 12 arranged axially can also relieve the vibration stress in the axial direction of the motor and improve the safety of the motor operation.

[0037] Specifically, the stator core 10 proposed in this embodiment is applied to a motor, especially a permanent magnet motor. It is understandable that the motor includes a housing 20, a stator core 10, a rotor, etc., and an installation cavity is formed inside the housing 20, and the stator core 10 and the rotor are arranged in the installation space. Among them, the stator core 10 includes a core body 11 and a first damping structure 12 arranged on the outer surface of the core body 11, and the core body 11 is sleeved on the outside of the rotor. When the motor is working, the vibration of the core body 11 can be absorbed by the first damping structure 12, which reduces the impact of the vibration on the housing 20 and effectively reduces the vibration of the housing 20. Moreover, in this embodiment, a plurality of first damping structures 12 are provided, and each first damping structure 12 can be directly installed on the outer surface of the core body 11, which is more convenient to install. In addition, a plurality of first damping structures 12 are arranged at intervals along the axial direction of the core body 11, and can support each other in the circumferential direction of the entire core body 11, which can play a better damping effect and further reduce vibration noise. At the same time, the first damping structure 12 arranged at axial intervals can also relieve the vibration stress in the axial direction of the motor and improve the safety of the motor operation. As an optional method, the first damping structure 12 can be made of a material with a damping coefficient greater than 0.1, such as high-damping rubber, high-damping magnesium alloy material, etc., so that more vibration can be absorbed and the vibration reduction and noise reduction effect can be improved.

[0038] For example, in one embodiment of the utility model, the first damping structure 12 is sleeved with the core body 11. It is understandable that the first damping structure 12 can be directly sleeved on the outer peripheral surface of the core body 11 due to its certain elasticity. Compared with slotting the core body 11 to fill the damping medium, the installation of the first damping structure 12 is more convenient. Moreover, the first damping structure 12 can also be ensured to be tightly combined with the core body 11.

[0039] For example, refer to Figure 2 In one embodiment of the utility model, the outer peripheral surface of the core body 11 is provided with a mounting groove 13, and the first damping structure 12 is interference fit with the mounting groove 13. It can be understood that each first damping structure 12 is respectively provided with a mounting groove 13, and the first damping structure 12 is installed in the corresponding mounting groove 13. By setting the mounting groove 13, the installation of the first damping structure 12 can be positioned to improve the accuracy of the installation of the first damping structure 12. In addition, the first damping structure 12 is interference fit with the mounting groove 13, which can further improve the reliability of the connection between the first damping structure 12 and the core body 11.

[0040] For example, in one embodiment of the present invention, the thickness of the first damping structure 12 is between 0.5 mm and 3 mm. It can be understood that the thicker the first damping structure 12 is, the better the damping effect of the anti-vibration noise is. Figure 6 , a curve showing the relationship between the motor radiation sound pressure level and the thickness of the first damping structure 12 is given. However, the thicker the first damping structure 12 is, the lower the positioning accuracy of the core body 11 is. Therefore, in this embodiment, the thickness of the first damping structure 12 is between 0.5 mm and 3 mm, which improves the positioning accuracy of the core body 11 while meeting the requirements of anti-vibration noise.

[0041] For example, refer to Figure 1 and Figure 2 In one embodiment of the utility model, the stator core 10 further includes a second damping structure 14, which extends along the axial direction of the core body 11, and two adjacent first damping structures 12 are limited by the second damping structure 14. It can be understood that the first damping structure 12 can be limited by the second damping structure 14 to prevent the first damping structure 12 from moving or misaligning, thereby improving the reliability of the first damping structure 14. At the same time, the first damping structure 12 and the second damping structure 14 cooperate to absorb vibration together, further improving the effect of vibration reduction and noise reduction.

[0042] For example, in one embodiment of the utility model, a plurality of second damping structures 14 are provided at intervals along the circumference of the core body 11. In this way, there will be heat dissipation gaps between two adjacent second damping structures 14 and between two adjacent first damping structures 12, thereby improving the heat dissipation performance and positioning accuracy of the stator core 10 while improving the vibration reduction and noise reduction effects.

[0043] Exemplarily, in an embodiment of the present invention, the width of the second damping structure 14 is greater than the width of the first damping structure 12. It can be understood that the width of the second damping structure 14 refers to the extension distance along the circumferential direction of the core body 11, and the width of the first damping structure 12 refers to the extension distance along the axial direction of the core body 11. The width of the second damping structure 14 is greater than the width of the first damping structure 12, which can cover more of the core body 11 in the circumferential direction, further improving the damping effect.

[0044] To achieve the above purpose, refer to Figure 3-Figure 5 The embodiment of the utility model provides a motor, the motor includes a housing 20 and a stator core 10 disposed in the housing 20, and the stator core 10 is the stator core 10 described above. Specifically, the specific structure of the stator core 10 refers to the above embodiment. Since the motor adopts all the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here one by one.

[0045] For example, refer to Figure 4 and Figure 5 In one embodiment of the utility model, the casing 20 includes an inner shell 21, an outer shell 22 sleeved on the outside of the inner shell 21, and a third damping structure 23 arranged between the inner shell 21 and the outer shell 22. The third damping structure 23 connects the inner shell 21 and the outer shell 22, and the first damping structure 12 connects the inner shell 21 and the core body 11.

[0046] Specifically, the inner shell 21 and the outer shell 22 are nested, that is, the outer shell 22 is sleeved on the outside of the inner shell 21, and the inner wall of the outer shell 22 and the outer wall of the inner shell 21 are not in contact. In other words, there is a gap between the inner wall of the outer shell 22 and the outer wall of the inner shell 21, and the third damping structure 23 is arranged in the gap. It can be understood that the third damping structure 23 connects the inner shell 21 and the outer shell 22. The vibration generated by the stator is first transmitted to the first damping structure 12, then to the inner shell 21, and then transmitted toward the outer shell 22 through the third damping structure 23. In this process, the first damping structure 12 can absorb the vibration transmitted to the inner shell 21, and the third damping structure 23 can absorb the vibration transmitted from the inner shell 21 to the outer shell 22, thereby effectively preventing the entire casing 20 from vibrating and reducing vibration noise.

[0047] As an optional method, the third damping structure 23 can be made of a material with a damping coefficient greater than 0.1, such as high-damping rubber, high-damping magnesium alloy material, etc., so that more vibrations can be absorbed and the vibration reduction and noise reduction effects can be improved.

[0048] For example, refer to Figure 5 In an embodiment of the present utility model, the third damping structure 23 includes a support member 231 and a damping member 232 arranged outside the support member 231 , and the damping member 232 connects the inner shell 21 and the outer shell 22 .

[0049] In this embodiment, the third damping structure 23 includes a support member 231 and a damping member 232. Among them, the support member 231 is used to provide support so that the inner shell 21 and the outer shell 22 remain fixed in the circumferential direction to form an integral component. The support member 231 can be made of an alloy material with a certain strength, such as a magnesium alloy material, which has a damping effect on the basis of strength. The damping member 232 is used to absorb vibrations, and the damping member 232 can be made of a rubber material with a relatively good damping effect. As an optional method, the thickness of the rubber material is 0.3 mm-1 mm. In one embodiment, the damping member 232 can be arranged on the outer surface of the support member 231, and can completely cover the support member 231, or can partially cover the support member 231. It can be selected according to the noise reduction requirements of different motors, and is not limited here.

[0050] In one embodiment, referring to Figure 4 and Figure 5 A plurality of third damping structures 23 are arranged at intervals along the circumference of the inner shell 21. The inner shell 21 and the outer shell 22 are arranged at intervals to form a first flow channel 241. At least one end of the third damping structure 23 in the axial direction of the inner shell 21 is arranged at intervals to form a second flow channel 242 from the end surface of the inner shell 21. The first flow channel 241 and the second flow channel 242 are connected to form a liquid cooling channel.

[0051] Specifically, the motor will generate heat when working, and relying solely on natural heat dissipation cannot meet the heat dissipation requirements. Therefore, it is necessary to dissipate heat from the motor through liquid cooling or oil cooling, timely reduce the surface temperature of the motor, and ensure the normal operation of the motor. To this end, in this embodiment, at least one end of the third damping structure 23 along the axial direction of the inner shell 21 is spaced apart from the end face of the inner shell 21 to form a second flow channel 242, and the first flow channel 241 and the second flow channel 242 are connected to form a liquid cooling channel, and cooling oil or coolant can flow in the liquid cooling channel to take away the heat of the motor through the flow of coolant or cooling oil. It can be understood that the inner shell 21 has two end faces (i.e., the first end face 211 and the second end face 212) in the axial direction, and the first end face 211 and the second end face 212 both protrude toward the outer shell 22, that is, the inner shell 21 is a structure with protrusions at both ends and a depression in the middle in the axial direction. Since the inner shell 21 and the outer shell 22 are not in direct contact, the first flow channel 241 is formed at the gap between the two. The third damping structure 23 is not in direct contact with one of the two end faces, that is, the third damping structure 23 can be in contact with the first end face 211 and not in contact with the second end face 212, the third damping structure 23 can also be in contact with the second end face 212 and not in contact with the first end face 211, the third damping structure 23 can also be in contact with the first end face 211 and not in contact with the second end face 212, so that a second flow channel 242 is formed between the third damping structure 23 and the non-contacting end face, and the first flow channel 241 and the second flow channel 242 are connected, so that the coolant or cooling oil can flow along the circumference of the casing 20, thereby dissipating the heat of the motor.

[0052] Exemplarily, in one embodiment of the utility model, two adjacent second flow channels 242 are staggered in the circumferential direction of the inner shell 21. That is, if one third damping structure 23 does not contact the first end face 211 of the inner shell 21, then the third damping structure 23 adjacent to the third damping structure 23 does not contact the second end face 212 of the inner shell 21, so that the coolant or cooling oil can flow along the axial direction of the inner shell 21 between the two adjacent third damping structures 23, thereby increasing the overall flow path length of the coolant or cooling oil, absorbing more heat, and further improving the heat dissipation effect.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the embodiment of the present invention. All equivalent structural changes made by using the description and drawings of the embodiment of the present invention under the inventive concept of the embodiment of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the embodiment of the present invention.

Claims

1. A stator core, characterized in that: The stator core includes a core body and a first damping structure arranged on the outer peripheral surface of the core body, and a plurality of the first damping structures are arranged at intervals along the axial direction of the core body.

2. The stator core according to claim 1, characterized in that: The first damping structure is sleeved with the core body.

3. The stator core according to claim 2, characterized in that: An installation groove is provided on the outer peripheral surface of the core body, and the first damping structure is interference-fitted with the installation groove.

4. The stator core according to any one of claims 1 to 3, characterized in that: The thickness of the first damping structure is between 0.5 mm and 3 mm.

5. The stator core according to claim 1, characterized in that: The stator core further includes a second damping structure, which extends along the axial direction of the core body, and two adjacent first damping structures are limited by the second damping structure.

6. The stator core according to claim 5, characterized in that: A plurality of the second damping structures are arranged at intervals along the circumferential direction of the core body.

7. The stator core according to claim 5, characterized in that: The width of the second damping structure is greater than the width of the first damping structure.

8. A motor, characterized in that: The motor comprises a casing and a stator core arranged in the casing, and the stator core is the stator core as described in any one of claims 1-7.

9. The motor according to claim 8, characterized in that The casing includes an inner shell, an outer shell sleeved outside the inner shell, and a third damping structure arranged between the inner shell and the outer shell, the third damping structure connects the inner shell and the outer shell, and the first damping structure connects the inner shell and the core body.

10. The motor according to claim 9, characterized in that The third damping structure includes a support member and a damping member arranged outside the support member, and the damping member connects the inner shell and the outer shell.

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