Stator, motor and compressor

Abstract

This application relates to a stator, a motor, and a compressor, belonging to the field of motor technology. The stator is used in a motor, which includes a housing and a stator core. The housing defines a hollow cavity. When the stator is assembled with the housing, the stator core passes through the hollow cavity. The inner wall of the housing has multiple first protrusions, and the outer periphery of the stator core has multiple grooves. At least a portion of the first protrusions is embedded in the grooves. According to the stator of this invention, the cooperation between the first protrusions and the grooves enhances the stiffness of the stator teeth, increasing the overall axial stiffness of the stator core. This increased axial stiffness of the stator teeth can prevent the occurrence of localized modes in the stator teeth at low frequencies.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more particularly to a stator, motor, and compressor. Background Technology

[0002] Currently, most compressor motor stator cores are made by stamping and riveting, and conventional fastening methods generally involve lamination or direct welding. With lamination structures, the axial stiffness of the stator teeth is relatively weak. If the tooth length is relatively long, local modes with frequencies below 1000Hz may appear in the stator teeth. Traditional motor stator press-fitting typically involves cutting weld grooves in the stator laminations and fixing them using argon arc welding. This method damages the stator core insulation, increasing iron losses and no-load current. Simultaneously, the weld primarily strengthens the axial direction of the yoke, while its effect on increasing tooth stiffness is limited. For some stators with a large ratio of tooth length to minimum yoke thickness, low-frequency local modes still exist in the teeth. During compressor operation, these local modes may resonate with the teeth, significantly impacting the compressor's noise and vibration levels.

[0003] Patent CN216981618U discloses a stator lamination, an electronic core, and a motor. The stator yoke has multiple recessed fastening points on its outer side, and the laminations are connected via these fastening points. The stator core connected by these fastening points has relatively weak axial stiffness, and while it increases the stiffness of the yoke in thermal contact with the housing, it has little effect on increasing the stiffness of the gear teeth.

[0004] Patent CN201721093463.2 discloses a novel method for press-fitting and fastening stator cores. Instead of punching slots on the outer circle of the stator laminations, steel tie rods are directly welded to the outer surface of the core circle at appropriate positions. This method will damage the insulation layer between the stator laminations, increase iron loss, and the tie rod slots are far from the tooth root, so the effect on enhancing the axial stiffness of the teeth is limited. If the ratio of the tooth thickness to the minimum yoke thickness is large, it is still impossible to avoid the occurrence of local modes in the teeth.

[0005] Therefore, there is an urgent need for a stator that can improve the strength of the stator core teeth. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a stator in which the stiffness of the stator teeth is improved by the cooperation of a first protrusion and a groove, thereby increasing the overall axial stiffness of the stator core. The increased axial stiffness of the stator teeth can avoid the occurrence of local modes of the stator teeth at low frequencies.

[0007] The present invention also proposes an electric motor, including the stator described above.

[0008] The present invention also proposes a compressor, including the aforementioned motor.

[0009] According to the present invention, the stator is used in an electric motor. The electric motor includes a housing, and the stator includes a stator core. The housing defines a hollow cavity. When the stator is assembled with the housing, the stator core passes through the hollow cavity. The inner wall of the housing is provided with a plurality of first protrusions, and the outer periphery of the stator core is provided with a plurality of grooves. At least a portion of the first protrusions is embedded in the grooves.

[0010] According to the stator of the present invention, the combination of the first protrusion and the groove enhances the stiffness of the stator teeth, thereby increasing the overall axial stiffness of the stator core. The increased axial stiffness of the stator teeth can prevent the occurrence of local modes of the stator teeth at low frequencies.

[0011] According to the stator of the present invention, the stator core includes a stator yoke and a plurality of stator teeth connected to the inner periphery of the stator yoke. The outer periphery of the stator yoke is provided with a plurality of second protrusions, which abut against the inner wall of the housing, and an airflow channel is defined between two adjacent second protrusions.

[0012] Optionally, in the axial direction perpendicular to the stator core, the straight line containing the two sides of the stator tooth width direction and the outer contour of the stator yoke together define a first region, and at least a portion of the groove is located in the first region.

[0013] Optionally, the maximum width W1 of the groove and the width W2 of the stator tooth satisfy: 1 / 2W2 <W1<2 / 3W2。

[0014] Optionally, along the radial direction of the stator core, the maximum depth D1 of the groove and the thickness D2 of the stator yoke satisfy: 1 / 3D2 <D1<1 / 2D2。

[0015] Optionally, the first protrusion includes a mating part and a connecting part connected in sequence. The connecting part is connected to the housing and the mating part respectively. When the stator is assembled with the housing, the mating part is embedded in the groove. In the axial direction perpendicular to the stator core, the cross-sectional shape of the mating part is the same as the cross-sectional shape of the groove.

[0016] Optionally, when the stator is assembled with the housing, in the axial direction perpendicular to the stator core, the cross-sectional shape of the mating part and the cross-sectional shape of the groove are both semi-circular, and the radius of the groove and the radius of the mating part are the same.

[0017] Optionally, in the axial direction perpendicular to the stator core, the center of the cross-section of the groove is collinear with the center line of symmetry of the cross-section of the stator tooth.

[0018] Optionally, when the stator is assembled with the housing, the thickness T1 of the stator teeth and the thickness T2 of the first protrusion along the axial direction of the stator core satisfy: 1 / 2T1 <T2<4 / 3T1。

[0019] The motor according to the present invention includes a housing defining a hollow cavity, a plurality of first protrusions on the inner wall of the housing, and the stator described above passing through the hollow cavity.

[0020] According to the present invention, by setting a stator with stronger axial stiffness, the motor operates more smoothly and prevents low-frequency resonance.

[0021] The compressor according to the present invention includes the motor described above.

[0022] According to the compressor of the present invention, by setting the motor that operates more smoothly, the vibration during compressor operation can be reduced, making the compressor operate more smoothly. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A cross-sectional view of the motor in the radial direction according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is a cross-sectional view of the stator along the radial direction according to an embodiment of the present invention;

[0028] Figure 4 A cross-sectional view of the housing of an electric motor according to an embodiment of the present invention along the radial direction;

[0029] Figure 5 This is a cross-sectional view of a motor along the axial direction according to an embodiment of the present invention.

[0030] Figure label:

[0031] Motor 100,

[0032] Stator 1, stator core 10, groove 11, stator yoke 12, stator teeth 13, second protrusion 14, airflow channel 142.

[0033] The shell 2 includes a first protrusion 201, a mating part 2012, a connecting part 2014, and a hollow cavity 202. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] like Figures 1-4 As shown, according to an embodiment of the present invention, the stator 1 is used in a motor 100. The motor 100 includes a housing 2, and the stator 1 includes a stator core 10. The housing 2 defines a hollow cavity 202. When the stator 1 is assembled with the housing 2, the stator core 10 passes through the hollow cavity 202. The inner wall of the housing 2 is provided with a plurality of first protrusions 201, and the outer periphery of the stator core 10 is provided with a plurality of grooves 11. At least a portion of the first protrusions 201 is embedded in the grooves 11. Figure 1 The radial cross-section of the housing 2 and stator core 10 during assembly is shown.

[0036] In detail, at least one end of the housing 2 is open, and the opening communicates with the hollow cavity 202 to accommodate the stator core 10. The stator core 10 is generally annular. The inner wall of the housing 2 is provided with a plurality of first protrusions 201, and the outer periphery of the stator core 10 is provided with a plurality of grooves 11. In some embodiments, a portion of the first protrusions 201 is embedded in the grooves 11, and in some embodiments, all the first protrusions 201 are embedded in the grooves 11. For example, the housing 2 is generally annular, and at least a portion of the inner wall of the housing 2 is spaced from the stator core 10. In this case, the first protrusion 201 may be partially embedded in the groove 11. Alternatively, the housing 2 may be an annular structure formed by a series of protruding and recessed segments connected in sequence (protruding towards the stator core 10 and recessed away from the stator core 10), with the first protrusion 201 located on the protruding segment and completely embedded in the groove 11. Alternatively, the housing 2 may be an annular structure with its inner wall abutting against the stator core 10, and the first protrusion 201 completely embedded in the groove 11. This application does not impose any limitations. The stator core 10 is an annular structure, and an installation channel is provided inside the stator core 10, penetrating the stator core 10, for mounting the rotor core.

[0037] According to the embodiment of the present invention, the stator 1, through the cooperation of the first protrusion 201 and the groove 11, improves the stiffness of the stator tooth 13, thereby increasing the overall axial stiffness of the stator core 10. The increase in axial stiffness of the stator tooth 13 can prevent the occurrence of local modes of the stator tooth 13 at low frequencies.

[0038] In some embodiments, a plurality of grooves 11 are evenly distributed along the circumference of the stator core 10, and a plurality of first protrusions 201 are evenly distributed along the inner circumference of the housing 2.

[0039] like Figure 1 and Figure 3 As shown, in some embodiments, the stator core 10 includes a stator yoke 12 and a plurality of stator teeth 13 connected to the inner periphery of the stator yoke 12. The outer periphery of the stator yoke 12 is provided with a plurality of second protrusions 14. When the stator 1 is assembled with the housing 2, the second protrusions 14 abut against the inner wall of the housing 2, and an airflow channel 142 is defined between two adjacent second protrusions 14. Since the second protrusions 14 abut against the inner wall of the housing 2, the stator yoke 12 is spaced from the inner wall of the housing 2. This forms an airflow channel 142, allowing the heat generated by the stator core 10 to be cooled by the flow of air in the airflow channel 142.

[0040] On the other hand, vibration is a common phenomenon in the operation of most mechanical equipment. Motor 100 will also vibrate to varying degrees during operation. The vibration of motor 100 will consume the energy of motor 100 to a certain extent, thereby reducing the efficiency of motor 100. In addition, vibration will directly damage the bearings of motor 100, accelerate the wear of motor 100 bearings, and greatly shorten their normal life. At the same time, it will loosen the rotor magnetic poles, which will easily cause mutual friction between stator 1 and rotor, increasing the risk of bending or breakage of motor 100 rotor. Furthermore, the vibration of motor 100 will cause the end binding wire of motor 100 to loosen, causing mutual friction between end windings, which will reduce the insulation resistance of windings to a certain extent, making short circuits more likely. Especially for compressors, it will directly affect the performance of compressors. While satisfying heat dissipation, the second protrusion 14 abuts against the inner wall of the housing 2, and the stator yoke 12 is separated from the inner wall of the housing 2, which can reduce the vibration transmitted to the housing 2, so that the natural frequency of the housing 2 is different from the working frequency of the motor 100, avoiding resonance and reducing noise. When the motor 100 is used in the compressor, it can improve the performance of the compressor.

[0041] Of course, on the other hand, when the stator 1 is applied to the motor 100, the motor 100 will generate a magnetic force when running. By setting the second protrusion 14, the distance between the magnetic force of the motor 100 and the housing 2 can be increased, thereby reducing the magnetic force on the housing 2, reducing the reaction force on the stator core 10, improving the stability of the stator core 10 when rotating, reducing the functional loss of the motor 100, and improving the efficiency of the motor 100.

[0042] It can be understood that the groove 11 is provided on one side of the stator yoke 12 close to the housing 2, and the stator tooth portion 13 is provided on the side of the stator yoke 12 facing away from the housing 2.

[0043] It should be noted that the abutment of the second protrusion 14 against the inner wall of the housing 2 includes at least two cases. One case is that the second protrusion 14 merely contacts the inner wall of the housing 2, and the other case is that the second protrusion 14 is welded to the inner wall of the housing 2. This application does not make any restrictions.

[0044] In some embodiments, the second protrusion 14 is integrally formed with the stator yoke 12.

[0045] In some embodiments, multiple second protrusions 14 are evenly distributed along the outer circumference of the stator yoke 12.

[0046] In some embodiments, the multiple grooves 11, the multiple first protrusions 201, and the multiple stator tooth portions 13 correspond to each other one by one.

[0047] In some embodiments, in the axial direction perpendicular to the stator core 10, the straight lines where the two side edges in the tooth width direction of the stator tooth portion 13 and the outer contour of the stator yoke 12 jointly define a first region, and at least part of the groove 11 is located in the first region. This enables the groove 11 to be closer to the stator tooth portion 13 and better enhance the stiffness of the stator tooth portion 13 in the axial direction.

[0048] As Figure 1 and Figure 2 shown, Figure 1 shows W2, Figure 2 shows W1. In some embodiments, the maximum width W1 of the groove 11 and the width W2 of the stator tooth portion 13 satisfy: 1 / 2W2 < W1 < 2 / 3W2. If the maximum width of the groove 11 is too large, the strength of the stator yoke 12 in the radial direction will be reduced. If the maximum width of the groove 11 is too small, the effect of the first protrusion 201 on enhancing the stiffness of the stator tooth portion 13 in the axial direction will be weak. Therefore, it is necessary to set a suitable value for the maximum width of the groove 11. For example, W1 can be 13 / 24W2, 14 / 24W2, 15 / 24W2, etc. This application does not make any restrictions.

[0049] As Figure 3As shown, in some embodiments, along the radial direction of the stator core 10, the maximum depth D1 of the groove 11 and the thickness D2 of the stator yoke 12 satisfy: 1 / 3D2 < D1 < 1 / 2D2. If the maximum depth of the groove 11 is too large, the strength of the stator yoke 12 in the radial direction will be reduced. If the maximum depth of the groove 11 is too small, the effect of the first protrusion 201 on enhancing the stiffness of the stator tooth portion 13 in the axial direction will be weak. Therefore, it is necessary to set an appropriate maximum depth rating for the groove 11. For example, the maximum depth D1 of the groove 11 can be 9 / 24D2, 10 / 24D2, 11 / 24D2, etc., which is not limited in this application.

[0050] In some embodiments, the first protrusion 201 includes a mating portion 2012 and a connecting portion 2014 that are connected in sequence. The connecting portion 2014 is connected to the housing 2 and the mating portion 2012 respectively. When the stator 1 is assembled with the housing 2, the mating portion 2012 is embedded in the groove 11. In the axial direction perpendicular to the stator core 10, the cross-sectional shape of the mating portion 2012 is the same as the cross-sectional shape of the groove 11. In this way, it is possible to prevent relative晃动 between the stator core 10 and the housing 2 during the operation of the motor 100, reduce the vibration generated by the housing 2 during the operation of the motor 100, further avoid resonance, and reduce the noise during the operation of the motor 100.

[0051] Among them, the cross-sectional shapes of the groove 11 and the mating portion 2012 can be square, rectangular, oval, triangular, etc.

[0052] It should be noted that the mating portion 2012, the connecting portion 2014 and the housing 2 are integrally formed. This is only a concept introduced to illustrate that a part of the first protrusion 201 is fitted with the groove 11 and the other part is not. The mating portion 2012 is formed by enclosing a semi-circular arc and a line segment. One end of the connecting portion 2014 shares the line segment with the mating portion 2012, and the other end is defined by the arc curve of the inner circle of the housing 2.

[0053] As Figure 1 and Figure 2 shown, in some embodiments, when the stator 1 is assembled with the housing 2, in the axial direction perpendicular to the stator core 10, the cross-sectional shapes of both the mating portion 2012 and the groove 11 are semi-circular, and the radius of the groove 11 is the same as the radius of the mating portion 2012. In this way, it is possible to simplify the structural setting, facilitate the assembly of the stator core 10 and the housing 2, and at the same time ensure that there is enough space to set the air flow channel 142, while increasing the stiffness of the stator tooth portion 13, ensuring the flow of the air in the air flow channel 142 for convenient heat dissipation.

[0054] As Figure 1As shown, in some embodiments, in the axial direction perpendicular to the stator core 10, the center of the cross-section of the groove 11 is collinear with the symmetry center line of the cross-section of the stator tooth portion 13. This makes the distance between the groove 11 and the stator tooth portion 13 relatively close, and can greatly enhance the stiffness of the stator tooth portion 13 in the axial direction.

[0055] As Figure 5 shown, in some embodiments, along the axial direction of the stator core 10, when the stator 1 is assembled with the housing 2, the thickness T1 of the stator tooth portion 13 and the thickness T2 of the first protruding portion 201 satisfy: 1 / 2T1 < T2 < 4 / 3T1. When the thickness of the first protruding portion 201 is too large, it will increase the overall volume of the motor 100. When the thickness of the first protruding portion 201 is too small, the effect of enhancing the stiffness of the stator tooth portion 13 in the axial direction is weak. Therefore, it is necessary to set the appropriate thickness of the first protruding portion 201. For example, T2 can be 13 / 24T1, 14 / 24T1, 15 / 24T1, 16 / 24T1, 17 / 24T1, 18 / 24T1, 19 / 24T1, 20 / 24T1, 21 / 24T1, 22 / 24T1, 23 / 24T1, 24 / 24T1, 25 / 24T1, 26 / 24T1, 27 / 24T1, 28 / 24T1, 29 / 24T1, 30 / 24T1, and 31 / 24T1, etc.

[0056] In some embodiments, the height of the housing 2 is the same as the stack height of the stator core 10, which can minimize the volume of the motor 100 as much as possible.

[0057] As Figure 4 shown, in some embodiments, the motor 100 includes a housing 2. The housing 2 defines a hollow cavity 202. A plurality of first protruding portions 201 are provided on the inner wall of the housing 2. The above-mentioned stator 1 is inserted into the hollow cavity 202.

[0058] According to the motor 100 of the embodiment of the present invention, by setting the stator 1 with stronger axial stiffness, the operating state of the motor 100 is more stable, preventing low-frequency resonance from occurring.

[0059] In a specific embodiment, the housing 2 is connected to the stator core 10 by a hot sleeve method, so that the outer circular surface of the second protruding portion 14 can be in full contact with the inner wall surface of the housing 2, and the end surface of the first protruding portion 201 is in full contact with the inner wall surface of the groove 11.

[0060] The compressor according to the embodiment of the present invention includes the above-mentioned motor 100.

[0061] The compressor according to the embodiment of the present invention can reduce the vibration during the operation of the compressor by setting the above-mentioned motor 100 with a more stable operation, making the operation of the compressor more stable.

[0062] In some embodiments, the motor 100 is connected to the compressor housing 2 by a heat fitting process, so that the outer circular surface of the motor 100 housing 2 is in complete contact with the inner circular surface of the compressor housing 2, which can reduce the vibration during compressor operation and make the compressor run more smoothly.

[0063] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A stator for an electric motor, the electric motor comprising a housing, characterized in that, The stator includes a stator core, and the housing defines a hollow cavity. When the stator is assembled with the housing, the stator core passes through the hollow cavity. The inner wall of the housing is provided with a plurality of first protrusions, and the outer periphery of the stator core is provided with a plurality of grooves. At least a portion of the first protrusions is embedded in the grooves. The stator core includes a stator yoke and a plurality of stator teeth connected to the inner periphery of the stator yoke. The outer periphery of the stator yoke is provided with a plurality of second protrusions. When the stator is assembled with the housing, the second protrusions abut against the inner wall of the housing, and an airflow channel is defined between two adjacent second protrusions. In the axial direction perpendicular to the stator core, the straight lines containing the two sides of the stator tooth width direction and the outer contour of the stator yoke together define a first region. At least a portion of the groove is located in the first region, and the maximum width W1 of the groove and the width W2 of the stator tooth satisfy: 1 / 2W2 <W1<2 / 3W2。 2. The stator according to claim 1, characterized in that, Along the radial direction of the stator core, the maximum depth D1 of the groove and the thickness D2 of the stator yoke satisfy: 1 / 3D2 <D1<1 / 2D2。 3. The stator according to claim 1 or 2, characterized in that, The first protrusion includes a mating part and a connecting part connected in sequence. The connecting part connects the housing and the mating part respectively. When the stator is assembled with the housing, the mating part is embedded in the groove. In the axial direction perpendicular to the stator core, the cross-sectional shape of the mating part is the same as the cross-sectional shape of the groove.

4. The stator according to claim 3, characterized in that, When the stator is assembled with the housing, in the axial direction perpendicular to the stator core, the cross-sectional shape of the mating part and the cross-sectional shape of the groove are both semi-circular, and the radius of the groove and the radius of the mating part are the same.

5. The stator according to claim 4, characterized in that, In the axial direction perpendicular to the stator core, the center of the cross-section of the groove is collinear with the center line of symmetry of the cross-section of the stator tooth.

6. The stator according to claim 1, characterized in that, When the stator is assembled with the housing, along the axial direction of the stator core, the thickness T1 of the stator teeth and the thickness T2 of the first protrusion satisfy: 1 / 2T1 <T2<4 / 3T1。 7. An electric motor, characterized in that, include: A housing that defines a hollow cavity, wherein a plurality of first protrusions are provided on the inner wall of the housing; The stator as described in any one of claims 1-6, wherein the stator is disposed within the hollow cavity.

8. A compressor, characterized in that, Includes the motor as described in claim 7.

Images