Stator iron core for suppressing breathing mode vibration of motor and motor

Abstract

The utility model relates to the technical field of motor noise control, in particular to a stator core for inhibiting motor breathing mode vibration and a motor, which comprises a stator core body, an axial through hole matched with a rotor core is arranged in the middle of the stator core body, the stator core body and the rotor core are separated by an air gap, and the air gap is communicated with the axial through hole. The stator core body is provided with a channel for air to be discharged or enter, an opening at one end of the channel is communicated with the air gap, and an opening at the other end of the channel is communicated with the outside of the stator core body. The vibration noise caused by breathing mode resonance can be greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor noise control technology, specifically to a stator core and motor for suppressing motor breathing mode vibration. Background Technology

[0002] Motor operation typically generates vibration and noise, especially in fields like new energy vehicles and home appliances. Motor noise directly impacts user experience and is a crucial factor in product competitiveness. Motor noise can be broadly categorized into electromagnetic noise, mechanical noise, aerodynamic noise, and switching noise. Among these, electromagnetic noise is the primary cause of motor vibration and noise. The interaction of the air gap magnetic field in the motor generates electromagnetic force waves that vary with time and space. These electromagnetic force waves cause vibrations in the motor stator and housing. The vibration of the stator and housing, in turn, causes vibrations in the surrounding air, generating electromagnetic noise. Particularly when the spatial order and frequency of the electromagnetic force waves are close to the mode shape and frequency of the stator structure, severe resonance can occur. Noise problems caused by stator breathing mode resonance are common and the most serious. The reason for resonance is that the stator breathing mode is the same as the zero-order radial electromagnetic force wave mode shape in space. When the frequency of the electromagnetic force wave and the frequency of the stator breathing mode are the same, resonance occurs.

[0003] The reason why the vibration noise caused by the 0th order breathing mode is more severe than that caused by other orders (such as the 2nd and 3rd orders) is that its mode shape is circularly expanding and contracting. This causes the space between the stator and rotor to change more rapidly (due to the small air gap, long stack thickness, and rapid volume change, air cannot be quickly discharged and drawn in, which is equivalent to a closed space). This results in the air inside being subjected to more intense repeated compression and expansion, which amplifies the stator vibration. The principle is similar to the "drumming effect".

[0004] Currently, methods for addressing breathing mode resonance (NMR) mainly involve two aspects: excitation and transmission path. Regarding excitation, the focus is typically on minimizing the amplitude of the zero-order radial force. Regarding the transmission path, methods usually include increasing stator thickness to raise the NMR frequency, or adding grooves to the stator and filling them with damping media to increase structural damping. However, reducing the zero-order radial force at the excitation level usually leads to a significant decrease in motor power density, efficiency, and other performance characteristics. On the other hand, increasing stator thickness or filling with damping media at the transmission path level typically increases cost and weight, with limited optimization effects.

[0005] Version 202211012521.X discloses a stator lamination, a stator core, and a motor. The stator lamination is entirely or partially discontinuous on its circumference, creating a discontinuity or partial discontinuity in the circumferential direction. This prevents or suppresses overall expansion and contraction, thus eliminating or weakening the vibration mode caused by overall expansion and contraction. This reduces or even eliminates the vibration noise caused by the motor's breathing mode resonance, fundamentally solving the breathing mode resonance problem. However, this solution has the following drawbacks: 1. If the stator is entirely discontinuous on its circumference, although the breathing mode is eliminated, the stator structural strength is significantly weakened, leading to more severe vibration noise problems at other frequencies. Furthermore, the stator is installed in the motor housing with an interference fit. If the stator is not a complete ring, the gap in the middle may absorb some of the interference, causing the stator and housing to not be tightly secured, leading to loosening and reliability issues. 2. If the stator is partially discontinuous, the breathing mode still exists. The local gap reduces the stator structural stiffness and lowers the frequency of the breathing mode. Decreased structural stiffness and reduced frequency will not only fail to alleviate the resonance problem, but will actually exacerbate the resonance problem caused by the stator breathing mode.

[0006] Paper 202210344181.4 discloses a method for suppressing breathing mode vibration in a surface magnetic pole permanent magnet synchronous motor. This method involves obtaining the frequency of the electromagnetic force that excites breathing mode vibration on the stator teeth, determining the order of the rotor harmonic magnetomotive force (MTF) related to the breathing mode vibration, adjusting the amplitude of the rotor harmonic MMF related to the breathing mode vibration, injecting harmonic current, calculating the radial concentrated electromagnetic force on the stator teeth after injection, obtaining the amplitude and phase of the harmonic electromagnetic force with the same frequency as the breathing mode vibration, and calculating the impact of the harmonic current on losses and efficiency. By adjusting the rotor harmonic MMF and injecting positive and negative phase sequence harmonic currents, the phase difference between the electromagnetic forces that excite breathing mode vibration on each stator tooth is changed, transforming the original breathing mode vibration into a non-breathing mode vibration, thus significantly suppressing electromagnetic vibration noise. However, this method has the following drawbacks: 1. Modifying the algorithm requires a certain amount of time for iterative analysis, making it more suitable for steady-state conditions and unsuitable for accelerated conditions, or even having very poor results, because the motor accelerates extremely quickly with a very short acceleration time, making it difficult for the algorithm to converge. 2. The breathing mode frequency is typically above 5000-6000Hz, and the effect of harmonic injection at high frequencies may be unsatisfactory. 3. Injecting harmonics of equal amplitude to completely cancel the radial electromagnetic force corresponding to the breathing mode frequency will have a significant negative impact on motor efficiency. 4. This method is only applicable to surface-pole permanent magnet synchronous motors, and its limitations are considerable. Utility Model Content

[0007] The purpose of this invention is to provide a stator core and motor that suppresses the breathing mode vibration of an electric motor, which can significantly reduce the vibration noise caused by breathing mode resonance.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] In a first aspect, this utility model provides a stator core for suppressing the breathing mode vibration of a motor, comprising a stator core body, wherein the stator core body has an axial through hole in the middle that is adapted to the rotor core, the stator core body and the rotor core are separated by an air gap, and the stator core body has a channel for air to be discharged or entered, one end of the channel is open and communicates with the air gap, and the other end of the channel is open and communicates with the outside of the stator core body.

[0010] Furthermore, the stator core body is composed of several stator laminations stacked together, and the inner wall of the stator laminations is uniformly provided with multiple stator slots for winding coils along the circumference.

[0011] Furthermore, the stator lamination includes an annular yoke portion, and the yoke portion extends inward along the radial direction of the annulus and is provided with a plurality of stator teeth. The plurality of stator teeth are evenly spaced along the circumference of the annulus of the yoke portion, and a stator slot is formed between two adjacent stator teeth. Any two adjacent stator teeth have the same tooth width.

[0012] Furthermore, at least one of the stator laminations is provided with a radially extending through hole, the internal opening of the through hole being located at the bottom of the stator slot or the top of the stator tooth, and the external opening of the through hole communicating with a groove on the outer wall of the stator core body, using the through hole as a channel.

[0013] Furthermore, at least two adjacent stator laminations have corresponding grooves on their sidewalls. The length of the grooves is arranged along the radial direction of the stator laminations and penetrates the inner and outer sidewalls of the stator laminations. The grooves between two adjacent stator laminations are joined to form a channel.

[0014] Furthermore, the channel includes an axial channel and a radial channel disposed within the stator core body. The axial channel extends axially along the stator core body, and at least one end of the axial channel extends outward to the outside of the stator core body. The radial channel extends radially along the stator core body, with its inner opening communicating with the air gap and its outer opening communicating with the axial channel.

[0015] Furthermore, the number of radial channels is two or more, and they are evenly spaced along the extension direction of the axial channels.

[0016] Furthermore, the stator core body has a groove on its outer wall that communicates with the external opening of the channel, and the groove extends along the axial direction of the stator core body.

[0017] Furthermore, the cross-sectional shape of the groove is rectangular, trapezoidal, circular, or triangular.

[0018] Secondly, this utility model provides an electric motor, including the stator core described above for suppressing the motor's breathing mode vibration.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a channel for air to be discharged or entered on the stator core body. One end of the channel is open and connected to the air gap, and the other end is open and connected to the outside of the stator core body. When the stator resonates, although the stator can still expand and contract rapidly, air can be quickly discharged or entered through the channel, ensuring the air pressure and external balance between the stator and rotor air gaps, thus breaking the "drumming effect" and significantly reducing the vibration noise caused by breathing mode resonance. Attached Figure Description

[0021] To more clearly illustrate the specific 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. Obviously, the drawings described below are only some embodiments of this utility model.

[0022] Figure 1 This shows one of the isometric views of the stator core provided in Embodiment 1 of the present invention;

[0023] Figure 2 The second isometric view of the stator core provided in Embodiment 1 of the present invention is shown;

[0024] Figure 3 A schematic diagram of the stator lamination of the stator core provided in Embodiment 1 of the present invention is shown;

[0025] Figure 4 An isometric view of the stator core provided in Embodiment 2 of the present invention is shown;

[0026] Figure 5 A schematic diagram of the stator lamination of the stator core provided in Embodiment 2 of the present invention is shown;

[0027] Figure 6 This diagram illustrates the fit between adjacent stator laminations of the stator core provided in Embodiment 3 of the present invention.

[0028] In the figure, 1—stator core body, 2—axial through hole, 3—channel, 31—axial channel, 32—radial channel, 4—groove, 5—stator lamination, 51—stator slot, 52—yoke, 53—stator tooth, 54—slot body. Detailed Implementation

[0029] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] Example 1, see Figure 1 and Figure 2 As shown, this utility model provides a stator core for suppressing the breathing mode vibration of a motor, including a stator core body 1. The stator core body 1 has an axial through hole 2 in its middle that matches the rotor core. The stator core body 1 and the rotor core are separated by an air gap. The size and shape of the axial through hole 2 match the rotor core of the motor, ensuring that the rotor can rotate smoothly inside it. The stator core body 1 has a channel 3 for air to be discharged or entered. One end of the channel 3 is open and communicates with the air gap, and the other end of the channel 3 is open and communicates with the outside of the stator core body 1.

[0032] This invention provides a channel 3 on the stator core body 1 for air to be discharged or entered. One end of the channel 3 is open and connected to the air gap, and the other end of the channel 3 is open and connected to the outside of the stator core body 1. When the stator resonates, although the stator can still expand and contract rapidly, air can be discharged or entered rapidly through the channel 3, ensuring the air pressure and external balance between the stator and rotor air gaps, thus breaking the "drumming effect" and significantly reducing the vibration noise caused by breathing mode resonance.

[0033] In a preferred embodiment, see Figure 1 As shown, the stator core body 1 is composed of several stator laminations 5 stacked together, and the inner wall of the stator laminations 5 is uniformly provided with a plurality of stator slots 51 for winding coils along the circumferential direction.

[0034] The main function of the stator slot 51 is to serve as the winding space for the coils, allowing the wires to be wound in the stator slot 51 according to a certain pattern to form the electromagnetic windings of the motor. By uniformly arranging the stator slots 51, it can be ensured that the electromagnetic windings are evenly distributed on the stator core body 1, thereby generating a uniform magnetic field. This uniform magnetic field helps to reduce motor vibration and noise, and improve the smoothness and efficiency of motor operation. At the same time, the design of the stator slot 51 also needs to consider factors such as wire insulation, fixation, and heat dissipation to ensure the reliability and stability of the motor during long-term operation.

[0035] Combined with the previously mentioned Channel 3 design, this laminated stator core can not only effectively suppress breathing mode vibration, but also further improve the overall performance of the motor by optimizing the layout of the electromagnetic windings and heat dissipation performance.

[0036] In a preferred embodiment, see Figure 3 As shown, the stator lamination 5 includes an annular yoke 52. The yoke 52 extends inward along the radial direction of the annulus and is provided with a plurality of stator teeth 53. The plurality of stator teeth 53 are evenly spaced along the circumference of the annulus of the yoke 52. A stator groove 51 is formed between two adjacent stator teeth 53. The tooth width of any two adjacent stator teeth 52 is the same.

[0037] The yoke 52 serves as the main support part of the stator lamination 5. It forms a closed ring around the axis of the motor, providing a stable support platform for the stator teeth 53 and the electromagnetic winding.

[0038] Starting from the yoke 52, multiple stator teeth 53 extend inward along the radial direction of the annulus. These stator teeth 53 are key components of the electromagnetic winding; they generate electromagnetic force by cutting magnetic flux, thereby driving the rotation of the motor. The number, shape, and size of the stator teeth 53 are designed according to the specific requirements of the motor to ensure that the motor can achieve the expected performance indicators.

[0039] Multiple stator teeth 53 are evenly spaced along the circumference of the yoke 52. This arrangement helps to achieve a uniform distribution of electromagnetic force and reduce motor vibration and noise. At the same time, stator slots 51 are formed between two adjacent stator teeth 53. These stator slots 51 are the spaces mentioned earlier for winding the coil.

[0040] It is worth noting that this invention also specifically emphasizes that the tooth width of any two adjacent stator teeth 53 is the same. This design is to ensure a more uniform distribution of the electromagnetic windings on the stator core body 1, thereby further improving the smoothness and efficiency of the motor's operation. If the tooth widths of the stator teeth 53 are inconsistent, it may lead to uneven distribution of electromagnetic force, increasing motor vibration and noise, and even affecting the service life of the motor.

[0041] In a preferred embodiment, see Figure 3 As shown, at least one of the stator laminations 5 is provided with a radially extending through hole. The internal opening of the through hole is located at the bottom of the stator slot 51 or the top of the stator tooth 53. The external opening of the through hole communicates with the groove 4 on the outer wall of the stator core body 1, using the through hole as a channel.

[0042] These through-holes play a crucial role in the structure, not only optimizing the airflow path but also enhancing the heat dissipation performance and structural strength of the stator core.

[0043] Specifically, the internal openings of these through holes are cleverly positioned at the bottom of the stator slot 51 or the top of the stator tooth 53. This arrangement allows the through holes to directly connect with the air gap region between the stator core body 1 and the rotor core, thus allowing air to flow freely between the electromagnetic winding and the stator core body 1. When the stator resonates, although it can still expand and contract rapidly, air can quickly escape or enter through the through holes on the stator laminations 5, ensuring air pressure and external balance between the stator and rotor air gaps, disrupting the "drumming effect," and significantly reducing vibration noise caused by breathing mode resonance. Furthermore, when the motor is running, the electromagnetic winding generates heat due to the current flowing through it. This heat can be quickly dissipated through the through holes, reducing the temperature rise of the electromagnetic winding and improving the motor's heat dissipation efficiency.

[0044] Meanwhile, the external opening of the through hole is connected to the groove 4 on the outer wall of the stator core body 1. The groove 4 serves as an outlet or inlet for air circulation, further widening the air circulation path and allowing air to circulate smoothly between the inside and outside of the stator core body 1. This design not only helps reduce the occurrence of breathing mode vibration, but also helps maintain the air humidity and temperature balance inside the stator core, improving the operating stability and reliability of the motor.

[0045] Furthermore, using through holes as channels also offers certain structural strength advantages. Since the through holes penetrate radially along the stator lamination 5, they can increase the stiffness and deformation resistance of the stator lamination 5 to a certain extent. When the motor is subjected to external forces or vibrations, the through holes can disperse and absorb some of the stress, reducing the risk of deformation and damage to the stator core body 1.

[0046] In summary, by providing a radially extending through hole on at least one stator lamination 5 and connecting it to the stator slot 51, stator tooth 53, and groove 4 on the outer wall of the stator core body 1, the stator core of this utility model has achieved significant improvements in suppressing breathing mode vibration, improving heat dissipation efficiency, and enhancing structural strength.

[0047] In a preferred embodiment, the outer wall of the stator core body 1 is provided with a groove 4 that communicates with the external opening of the channel 3, and the groove 4 extends along the axial direction of the stator core body 1. The groove 4 is mainly designed to communicate with the external opening of the previously mentioned channel 3 (i.e., the through hole on the stator lamination 5), thereby forming a complete airflow path. This design is of great significance for optimizing airflow, reducing breathing mode vibration, and improving heat dissipation efficiency.

[0048] Specifically, the grooves 4 extend axially along the stator core body 1, meaning they are distributed along the axial direction of the motor (i.e., the direction of the rotor's rotation axis). This arrangement helps ensure that air can flow smoothly between the inside and outside of the stator core body 1, regardless of the motor's operating state.

[0049] Regarding the cross-sectional shape of the groove 4, this invention provides several options, including rectangular, trapezoidal, circular, or triangular shapes. Each of these different cross-sectional shapes has its own advantages and disadvantages, but all can meet the needs of airflow to a certain extent. For example, a rectangular cross-section is simple, practical, and easy to process; a trapezoidal cross-section may provide better airflow guidance in certain situations; a circular cross-section has better smoothness and corrosion resistance; while a triangular cross-section may be more advantageous in certain specific layouts.

[0050] It is worth noting that the cross-sectional shape and size of the groove 4 are not chosen arbitrarily, but rather require comprehensive consideration based on the specific needs and design conditions of the motor. For example, factors such as the motor's power, speed, operating environment, and heat dissipation requirements need to be considered to determine the most suitable groove shape and size.

[0051] Furthermore, the placement of the grooves 4 needs careful planning. They should be as close as possible to the through holes on the stator laminations to ensure smooth airflow. At the same time, the arrangement of the grooves 4 also needs to consider the uniformity and efficiency of airflow to avoid problems such as localized congestion or dead zones.

[0052] Example 2, see Figure 4 As shown, this utility model provides a stator core for suppressing the breathing mode vibration of a motor, including a stator core body 1. The stator core body 1 has an axial through hole 2 in its middle that matches the rotor core. The stator core body 1 and the rotor core are separated by an air gap. The size and shape of the axial through hole 2 match the rotor core of the motor, ensuring that the rotor can rotate smoothly inside it. The stator core body 1 has a channel 3 for air to be discharged or entered. One end of the channel 3 is open and communicates with the air gap, and the other end of the channel 3 is open and communicates with the outside of the stator core body 1.

[0053] See Figure 5As shown, the channel 3 includes an axial channel 31 and a radial channel 32 disposed within the stator core body 1. The axial channel 31 extends axially along the stator core body 1 to the outside of the stator core body 1. The radial channel 32 extends radially along the stator core body 1, with its internal opening communicating with the air gap and its external opening communicating with the axial channel 31. This composite channel design allows for smoother airflow, better suppresses motor breathing mode vibration, and further improves the heat dissipation performance and stability of the stator core body 1.

[0054] The axial channel 31 is a channel that extends along the axial direction of the stator core body 1 to the outside of the stator core body 1. Its main function is to provide an axial flow path for air, avoiding the need to open new grooves on the outer wall of the stator core body 1 and ensuring the normal circulation of coolant on the outside of the stator core body 1.

[0055] The radial channel 32 extends radially along the stator core body 1. Its internal opening communicates with the air gap, while its external opening communicates with the axial channel 31. This arrangement allows air in the air gap to expand or contract due to temperature changes, entering or leaving the stator core body 1 through the radial channel 32 and flowing out along the axial channel 31. This configuration not only helps reduce breathing mode vibration but also optimizes the airflow path and improves heat dissipation efficiency.

[0056] To further enhance airflow, this invention further proposes the number and arrangement of radial channels. Specifically, there are two or more radial channels 32, and they are evenly spaced along the extension direction of the axial channel 31. This arrangement ensures that air is evenly distributed inside the stator core body 1, avoiding local overheating or insufficient cooling. Simultaneously, the multiple radial channels 32 increase the number of airflow channels, improving airflow efficiency and speed.

[0057] Example 3, see Figure 1 As shown, this utility model provides a stator core for suppressing the breathing mode vibration of a motor, including a stator core body 1. The stator core body 1 has an axial through hole 2 in its middle that matches the rotor core. The stator core body 1 and the rotor core are separated by an air gap. The size and shape of the axial through hole 2 match the rotor core of the motor, ensuring that the rotor can rotate smoothly inside it. The stator core body 1 has a channel 3 for air to be discharged or entered. One end of the channel 3 is open and communicates with the air gap, and the other end of the channel 3 is open and communicates with the outside of the stator core body 1. The stator core body 1 is formed by stacking several stator laminations 5. The inner wall of each stator lamination 5 has a plurality of stator slots 51 evenly arranged circumferentially for winding coils.

[0058] See Figure 6 As shown, at least two adjacent stator laminations 5 have corresponding grooves 54 on their side walls. The length direction of the grooves 54 is arranged along the radial direction of the stator laminations 5 and penetrates the inner and outer side walls of the stator laminations 5. The grooves 54 between two adjacent stator laminations 5 are connected to form a channel 3.

[0059] This design fully utilizes the structural features of the stator laminations 5, transforming what might otherwise be considered useless space into a useful channel. Furthermore, since the slots 54 are arranged radially along the stator laminations 5, their connections to the air gap and the outside of the stator core body 1 are very direct and smooth, facilitating airflow.

[0060] Furthermore, this design offers excellent flexibility and scalability. The number, size, shape, and position of the troughs 54 can be adjusted as needed to meet different ventilation requirements. For example, in areas where enhanced ventilation is required, the number of troughs 54 can be increased or their size enlarged; while in space-constrained locations, the shape and layout of the troughs 54 can be optimized to make full use of limited space.

[0061] Example 4: This utility model provides an electric motor, including the stator core for suppressing the breathing mode vibration of the motor as described in any of the embodiments of Examples 1 to 3.

[0062] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A stator core for suppressing breathing mode vibration of an electric motor, comprising a stator core body (1), wherein the stator core body (1) has an axial through hole (2) in the middle adapted to a rotor core, and the stator core body (1) and the rotor core are separated by an air gap, characterized in that: The stator core body (1) is provided with a channel (3) for air to be discharged or entered. One end of the channel (3) is open and connected to the air gap, and the other end of the channel (3) is open and connected to the outside of the stator core body (1).

2. The stator core for suppressing motor breathing mode vibration according to claim 1, characterized in that: The stator core body (1) is composed of several stator laminations (5) stacked together. The inner wall of the stator laminations (5) is uniformly provided with multiple stator slots (51) for winding coils along the circumferential direction.

3. The stator core for suppressing motor breathing mode vibration according to claim 2, characterized in that: The stator lamination (5) includes an annular yoke (52), which extends inward along the radial direction of the annulus and is provided with a plurality of stator teeth (53). The plurality of stator teeth (53) are evenly spaced along the circumference of the annulus of the yoke (52), and a stator groove (51) is formed between two adjacent stator teeth (53). The tooth width of any two adjacent stator teeth (53) is the same.

4. The stator core for suppressing motor breathing mode vibration according to claim 3, characterized in that: At least one of the stator laminations (5) is provided with a radially extending through hole. The internal opening of the through hole is located at the bottom of the stator slot (51) or the top of the stator tooth (53). The external opening of the through hole is connected to the groove (4) on the outer wall of the stator core body (1), and the through hole serves as a channel (3).

5. The stator core for suppressing motor breathing mode vibration according to claim 2, characterized in that: At least two adjacent stator laminations (5) have corresponding grooves (54) on their side walls. The length direction of the grooves (54) is arranged along the radial direction of the stator laminations (5) and penetrates the inner and outer side walls of the stator laminations (5). The grooves between two adjacent stator laminations (5) are connected to form a channel (3).

6. The stator core for suppressing motor breathing mode vibration according to claim 1, characterized in that: The channel (3) includes an axial channel (31) and a radial channel (32) disposed in the stator core body (1). The axial channel (31) extends along the axial direction of the stator core body (1), and at least one end of the axial channel (31) extends to the outside of the stator core body (1). The radial channel (32) extends along the radial direction of the stator core body (1). The inner opening of the radial channel (32) communicates with the air gap, and the outer opening of the radial channel (32) communicates with the axial channel (31).

7. The stator core for suppressing motor breathing mode vibration according to claim 6, characterized in that: The number of radial channels is two or more, and they are evenly spaced along the extension direction of the axial channels.

8. The stator core for suppressing motor breathing mode vibration according to claim 1, characterized in that: The stator core body (1) has a groove (4) on its outer wall that communicates with the external opening of the channel (3), and the groove (4) extends along the axial direction of the stator core body (1).

9. The stator core for suppressing motor breathing mode vibration according to claim 8, characterized in that: The cross-sectional shape of the groove (4) is rectangular, trapezoidal, circular or triangular.

10. An electric motor, characterized in that: Includes the stator core for suppressing motor breathing mode vibration as described in any one of claims 1 to 9.

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