Stator core, motor and compressor

Abstract

The utility model relates to the technical field of motors, and discloses a stator core, which comprises an annular yoke part; the trimming part is arranged on the peripheral side of the yoke part, is formed by trimming the peripheral side of the yoke part, and is in a modulation wave curve shape on the end surface of the stator iron core. The trimming part is arranged on the peripheral side of the yoke part of the stator core, and the shape of the trimming part on the end face of the stator core is in the shape of the modulated wave curve, so that when the stator core is assembled into the compressor shell, a channel formed between the trimming part and the compressor shell can ensure a certain refrigerant circulation amount, and the refrigerant circulation amount is reduced. And the peripheral side of the stator iron core and the compressor shell still have a relatively large contact area, so that the holding force between the stator iron core and the compressor shell is ensured, and the reliability of the compressor under high-temperature and high-pressure long-time operation can be improved. The utility model further discloses a motor and a compressor.

Description

Technical Field

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

[0002] The compressor includes a housing, a stator core and a rotor core, wherein the housing and the stator core are often fitted by interference, and the outer circle of the stator core and the inner circle of the compressor housing are interferingly fitted or three-point welded to ensure that the motor has sufficient clamping force to meet the reliability requirements of the compressor. In addition, a sufficient gap needs to be reserved between the outer circle of the stator core and the compressor housing to ensure that the oil return volume of the compressor meets the requirements.

[0003] At present, in order to ensure the oil return of the compressor, a trimming part is usually set on the outer circle of the stator core to ensure sufficient oil return and allow the refrigerant to flow normally through the core without residue. In addition, the outer circle magnetic field of the stator core contributes less to the effective output of the motor and contributes more to the loss. By setting the trimming part, the iron loss of the motor can be effectively reduced and the energy efficiency of the motor can be improved. In the prior art, the stator includes a punching sheet body with an annular structure and a plurality of punching sheet slots arranged on the punching sheet body. The punching sheet body is provided with a plurality of trimming structures and a plurality of buckle point structures, and each buckle point structure is distributed on the center line of a corresponding trimming structure.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The contact area between the outer circle of the stator core and the inner circle of the compressor housing is reduced, thereby reducing the clamping force between the stator and the housing. During long-term operation, the stator core and the housing may become loose and axially displaced, resulting in a reduction in the effective core length of the motor, reduced motor output, and increased losses, thereby reducing the motor's energy efficiency.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a stator core, a motor and a compressor, which take into account both the clamping force between the stator core and the compressor housing and the flow rate of the refrigerant flowing through the stator core.

[0009] According to a first aspect of the utility model, a stator core is provided, comprising:

[0010] The yoke is annular;

[0011] The trimming portion is arranged on the outer peripheral side of the yoke portion and is formed after the outer peripheral side of the yoke portion is trimmed, and is in the shape of a modulated wave curve on the end surface of the stator core.

[0012] In some embodiments, the shape of the trimming portion on the end surface of the yoke portion includes a first shape and a second shape, the first shape being a plurality of arcs arranged at intervals; the second shape being a trough shape of a modulation wave curve, arranged between adjacent arcs.

[0013] In some embodiments, the distance between any point selected on the trimming portion and the central axis of the stator core is R1, then

[0014]

[0015] Among them, R0 is the outer diameter of the stator core; β is the central angle formed by the line connecting the selected point on the cut edge and the point O' where the maximum peak of the modulation wave curve is located and the axis O on the end surface; α is the central angle formed by the line connecting the two ends of the cut edge on the end surface and the axis on the end surface; n is the number of cycles of the modulation wave curve; T is the thickness of the compressor housing adapted to the stator core.

[0016] In some embodiments, a maximum peak O' of the modulation wave curve is connected to the axis on the end surface, the intersection of the connection line and the outer circle of the stator core is M, and the distance between the intersection M and the maximum peak O' is ΔR.

[0017] In some embodiments, a guide groove is formed between the trimming portion and the inner side wall of the compressor housing, and the area of ​​the guide groove on the end surface is S0, then,

[0018]

[0019] Here, dβ is the differential of β.

[0020] In some embodiments, the side of the guide groove opposite to the inner side wall of the compressor housing is a notch, and the area of ​​the notch is S1.

[0021] S1=R0*π*L*α / 360,

[0022] Wherein, L is the stack height of the stator core.

[0023] In some embodiments, n=LCM[Z,P] / m, m=2P, where Z is the number of slots of the stator core, P is the number of pole pairs of the rotor core matched with the stator core, LCM is the least common multiple, and m is the number of trimming portions.

[0024] In some embodiments, 10°<α<15°.

[0025] In some embodiments, there are a plurality of trimming portions, which are spaced apart and distributed along the outer circumference of the yoke portion.

[0026] According to a second aspect of the present invention, there is provided a motor, comprising:

[0027] The stator core provided by any of the aforementioned embodiments comprises a mounting cavity;

[0028] The rotor core is arranged in the installation cavity.

[0029] According to a third aspect of the utility model, a compressor is provided, comprising:

[0030] A shell body, including a receiving cavity inside;

[0031] The motor provided in the aforementioned embodiment is arranged in the accommodating cavity.

[0032] The stator core, motor and compressor provided by the embodiments of the present disclosure can achieve the following technical effects: a cutting edge portion is provided on the outer peripheral side of the yoke portion of the stator core, and the shape of the cutting edge portion on the end face of the stator core is a modulated wave curve, so that when the stator core is assembled into the interior of the compressor housing, the channel formed between the cutting edge portion and the compressor housing can ensure a certain refrigerant flow rate, and the outer peripheral side of the stator core and the compressor housing still have a large contact area, thereby ensuring the clamping force between the stator core and the compressor housing, and thus being able to improve the reliability of the compressor under high temperature and high pressure and long-term operation.

[0033] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0035] Figure 1 It is a structural schematic diagram of a stator core and a compressor housing provided by an embodiment of the present disclosure;

[0036] Figure 2 yes Figure 1 A magnified view of part A;

[0037] Figure 3 is a schematic structural diagram of a stator core provided in an embodiment of the present disclosure;

[0038] Figure 4It is a schematic diagram of the structure of another stator core and compressor housing provided by an embodiment of the present disclosure.

[0039] Reference numerals:

[0040] 10: yoke; 20: trimming portion; 30: axis; 40: tooth portion; 50: compressor housing. DETAILED DESCRIPTION

[0041] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0042] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0044] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0045] Unless otherwise stated, the term "plurality" means two or more.

[0046] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0047] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0049] The motor includes a stator core and a rotor core. The stator core includes a yoke 10 and a tooth 40. The yoke 10 is annular. The number of tooth 40 is multiple and is arranged at intervals on the inner periphery of the yoke 10. Stator slots are formed between adjacent tooth 40. The tooth 40 forms a mounting cavity with a circular cross section on one side facing the central axis. The rotor core is arranged in the mounting cavity. An air gap is formed between the rotor core and the stator core.

[0050] Combination Figures 1 to 3 As shown, an embodiment of the present disclosure provides a stator core, including a yoke 10 and a trimming portion 20, wherein the yoke 10 is annular; the trimming portion 20 is arranged on the outer peripheral side of the yoke 10, and is formed by trimming the outer peripheral side of the yoke 10, and is in the shape of a modulated wave curve on the end face of the stator core.

[0051] The disclosed embodiment provides a trimming portion 20 on the outer peripheral side of the yoke 10 of the stator core, and makes the trimming portion 20 on the end face of the stator core in a modulated wave curve shape. In this way, when the stator core is assembled into the interior of the compressor housing 50, the channel formed between the trimming portion 20 and the compressor housing 50 can ensure a certain refrigerant flow rate, and the outer peripheral side of the stator core and the compressor housing 50 still have a large contact area, thereby ensuring the clamping force between the stator core and the compressor housing 50, and further improving the reliability of the compressor under high temperature and high pressure and long-term operation.

[0052] In the embodiment disclosed herein, the trimming portion 20 is disposed on the outer peripheral side of the yoke 10. Although this reduces the contact area between the outer peripheral side of the yoke 10 and the inner wall of the compressor housing 50, the channel enclosed between the trimming portion 20 and the inner wall of the compressor housing 50 can ensure sufficient oil return and allow the refrigerant to pass through.

[0053] In the disclosed embodiment, the trimmed portion 20 is formed by trimming the outer peripheral side of the yoke 10, so the trimmed portion 20 is recessed inwardly relative to the outer peripheral side of the yoke 10. When the stator core is installed inside the compressor housing 50, the trimmed portion 20 can form a channel with the inner side wall of the compressor housing 50.

[0054] The end face of the stator core refers to the area formed by the two ends of the stator core in the length direction. The trimming portion 20 is in the shape of a modulated wave curve on the end face, so that when it is installed inside the compressor housing 50, a certain amount of refrigerant flow can be guaranteed, and the clamping force between the stator core and the compressor housing 50 can be guaranteed, thereby improving the reliability of the compressor under high temperature and high pressure and long-term operation.

[0055] Optionally, the modulated wave is a sine wave, a square wave or a sawtooth wave. Optionally, the modulated wave includes a plurality of cycles, and the peak value of the trough of each cycle is different.

[0056] Optionally, the annular yoke 10 includes an outer peripheral side and an inner peripheral side, and the tooth portion 40 is connected to the inner peripheral side and extends in the direction of the central axis.

[0057] Optionally, the width of the yoke 10 is less than or equal to the width of the tooth 40, the width of the yoke 10 is the distance between the outer peripheral side of the yoke 10 and the central axis minus the distance between the inner peripheral side of the yoke 10 and the central axis, and the width of the tooth 40 is the distance between two opposite sides of the tooth 40.

[0058] In some embodiments, the shape of the trimming portion 20 on the end surface of the yoke 10 includes a first shape and a second shape, wherein the first shape is a plurality of arcs arranged at intervals; and the second shape is a trough shape of a modulation wave curve, arranged between adjacent arcs.

[0059] Here, the outer peripheral side of the yoke 10 is trimmed according to the shape of the trough part of the modulation wave curve to form a trimming portion 20. The first shape of the trimming portion 20 is an arc shape remaining after the outer peripheral side is cut, and the second shape is a trough shape. The first shape and the second shape constitute the shape of the trimming portion 20, which can enable the stator core to maintain the oil return effect of the compressor and ensure a certain refrigerant circulation rate after being installed in the compressor, thereby ensuring the clamping force between the stator core and the compressor housing 50.

[0060] Here, the portion of the modulation wave curve protruding toward the central axis of the stator core is taken as the trough, and the portion of the modulation wave curve protruding away from the central axis of the stator core is taken as the peak.

[0061] In some embodiments, the distance between any point on the trimming portion 20 and the central axis of the stator core is R1, then,

[0062]

[0063] Among them, R0 is the outer diameter of the stator core; β is the central angle formed by the line connecting the selected point on the trimming portion 20 and the point O' where the maximum peak of the modulation wave curve is located and the axis 30O on the end surface; α is the central angle formed by the line connecting the two ends of the trimming portion 20 on the end surface and the axis 30 on the end surface; n is the number of cycles of the modulation wave curve; T is the thickness of the compressor housing 50 adapted to the stator core.

[0064] In the disclosed embodiment, the distance between any point on the trimming portion 20 and the central axis of the stator core is calculated based on multiple parameters such as the outer diameter of the stator core. In this way, by determining the distance between any point on the trimming portion 20 and the central axis of the stator core, the specific curve shape of the trimming portion 20 can be determined.

[0065] Here, the outer diameter of the stator core is specifically the distance between the outer peripheral side of the yoke 10 and the central axis.

[0066] In some embodiments, a guide groove is formed between the trimming portion 20 and the inner side wall of the compressor housing 50, and the area of ​​the guide groove on the end surface is S0, then,

[0067]

[0068] In the disclosed embodiment, the channel formed between the trimming portion 20 and the inner side wall of the compressor housing 50 is a guide groove, which can allow the compressor to return oil and also allow the refrigerant to circulate. The guide groove extends along the length direction of the stator core, and the two ends of the guide groove form a refrigerant inlet and a refrigerant outlet on the end surface. The guide groove has a certain area on the end surface, namely the guide area, and the guide area is calculated by integration based on the parameters β, α and n. In this way, it can be ensured that the guide groove has sufficient guide area, the flow rate of the refrigerant is guaranteed, and the harmonic magnetic field can also be eliminated. By limiting the size of ΔR, it can be ensured that the stator core has sufficient structural strength.

[0069] The disclosed embodiment determines the flow guide area according to a plurality of parameters, so that the flow guide area is of a reasonable size, is conducive to the circulation of the refrigerant, and ensures a certain refrigerant circulation amount.

[0070] In some embodiments, the side of the guide groove opposite to the inner side wall of the compressor housing 50 is a notch, and the area of ​​the notch is S1, then,

[0071] S1=R0*π*L*α / 360,

[0072] Wherein, R0 is the outer diameter of the rotor core matched with the stator core, L is the stacking height of the stator core, and α is the central angle formed by the line connecting the two ends of the trimmed portion 20 on the end surface and the axis 30 on the end surface.

[0073] In the disclosed embodiment, the notch of the guide groove extends along the length direction of the stator core. When the stator core is installed inside the compressor housing 50, the notch of the guide groove is opposite to the inner wall of the compressor housing 50. When the trimming portion 20 is not provided on the yoke 10, the entire outer peripheral side of the yoke 10 is in contact with the inner wall of the compressor housing 50. When the trimming portion 20 is provided on the yoke 10, the trimming portion 20 is not in contact with the inner wall of the compressor housing 50, and the non-trimmed portion 20 is still in contact with the inner wall of the compressor housing 50. The area of ​​the notch also represents the reduced contact area between the outer peripheral side of the yoke 10 and the inner wall of the compressor housing 50 in the stator core provided with the trimming portion 20 compared to the stator core not provided with the trimming portion 20.

[0074] The stack height of the stator core, that is, the length of the stator core extending in the direction of the central axis.

[0075] Combination Figures 1 to 4 As shown, in some embodiments, n=LCM[Z,P] / m, m=2P, wherein Z is the number of slots of the stator core, P is the number of pole pairs of the rotor core matched with the stator core, LCM is the least common multiple, and m is the number of the trimming portions 20.

[0076] In this way, the first-order tooth harmonics generated by the stator and rotor tooth slot effect can be effectively filtered, thereby reducing the motor torque pulsation and improving the sinusoidal nature of the back electromotive force. At the same time, for a motor with a stator core slot number Z and a rotor core pole pair number P, the radial force wave spatial order that generates noise is K, where the harmonic order that mainly acts on the motor noise is K=2P. By combining the corresponding number of slots and the number of bands, the peaks and troughs of the radial force wave can overlap with the slot position, so that the maximum peak point of the force wave cannot act on the compressor housing 50, reducing the response of exciting resonance, and attenuating the force wave energy of the spatial order K. Figure 4 The direction indicated by the middle arrow is the direction and action position of the radial electromagnetic force of the motor.

[0077] In some embodiments, 10°<α<15°. In this way, on the one hand, the transmission of radial electromagnetic force can be effectively reduced, and on the other hand, the contact area between the outer peripheral side of the yoke 10 and the inner side wall of the compressor housing 50 is sufficient to ensure the clamping force between the stator core and the compressor housing 50.

[0078] In some embodiments, there are a plurality of trimming portions 20 , which are spaced apart along the outer circumference of the yoke 10 .

[0079] In the embodiment of the present disclosure, a plurality of trimming portions 20 are provided, and the plurality of trimming portions 20 are spaced apart and distributed along the outer circumference of the yoke 10 , so that the transmission of radial electromagnetic force can be effectively reduced.

[0080] Optionally, the number of the trimming portions 20 is six.

[0081] An embodiment of the present disclosure further provides a motor, comprising a stator core and a rotor core as provided in the above embodiment, wherein the stator core comprises an installation cavity; and the rotor core is disposed in the installation cavity.

[0082] The motor provided in the embodiment of the present disclosure has a stator core provided with a trimming portion 20 in the shape of a modulation wave curve. When the motor is installed inside the compressor housing 50, the channel formed between the trimming portion 20 of the stator core and the compressor housing 50 can ensure a certain refrigerant flow rate, and the outer peripheral side of the stator core and the compressor housing 50 still maintain a large contact area, thereby ensuring the clamping force between the motor and the compressor housing 50, and further improving the reliability of the compressor under high temperature and high pressure and long-term operation.

[0083] Optionally, the motor further includes a rotating shaft, the rotor core includes a rotating shaft hole located at the center of the rotor core, and the rotating shaft is passed through the rotating shaft hole.

[0084] An embodiment of the present disclosure further provides a compressor, comprising: a shell and a motor as provided in any of the aforementioned embodiments, wherein the shell includes an accommodating cavity inside, the motor is disposed in the accommodating cavity, and the motor is in contact with an inner wall of the shell.

[0085] The compressor provided in the embodiment of the present disclosure has a stator core of a motor provided with a cutting edge portion 20, so that a channel for oil return and refrigerant flow is formed between the motor and the casing. In this way, a certain refrigerant flow rate can be guaranteed, and the clamping force between the motor and the compressor casing 50 can be guaranteed, thereby improving the reliability of the compressor under high temperature and high pressure and long-term operation.

[0086] The compressor provided in the embodiment of the present disclosure can be applied to a refrigeration device. Optionally, the refrigeration device is an air conditioner or a refrigerator.

[0087] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A stator core, characterized in that: include: The yoke is annular; The trimming portion is arranged on the outer peripheral side of the yoke portion, is formed by trimming the outer peripheral side of the yoke portion, and is in a modulated wave curve shape on the end surface of the stator core.

2. The stator core according to claim 1, characterized in that: The shape of the trimming portion on the end surface of the yoke portion includes a first shape and a second shape, wherein the first shape is a plurality of arcs arranged at intervals; and the second shape is a trough shape of the modulation wave curve, which is arranged between adjacent arcs.

3. The stator core according to claim 1 or 2, characterized in that: The distance between any point selected on the trimming portion and the central axis of the stator core is R1, then Wherein, R0 is the outer diameter of the stator core; β is the central angle formed by the line connecting the selected point on the trimming portion and the point O' where the maximum peak of the modulation wave curve is located and the axis O on the end surface; α is the central angle formed by the line connecting the two ends of the trimming portion on the end surface and the axis on the end surface; n is the number of cycles of the modulation wave curve; T is the thickness of the compressor housing adapted to the stator core; A maximum peak O' of the modulation wave curve is connected to the axis on the end surface, the intersection of the connection line and the outer circle of the stator core is M, and the distance between the intersection M and the maximum peak O' is ΔR.

4. The stator core according to claim 3, characterized in that: A guide groove is formed between the trimming portion and the inner side wall of the compressor housing, and the area of ​​the guide groove on the end surface is S0, then, Here, dβ is the differential of β.

5. The stator core according to claim 4, characterized in that: The side of the guide groove opposite to the inner side wall of the compressor housing is a notch, and the area of ​​the notch is S1. S1=R0*π*L*α / 360, Wherein, L is the stacking height of the stator core.

6. The stator core according to claim 3, characterized in that: n=LCM[Z,P] / m, m=2P, wherein Z is the number of slots of the stator core, P is the number of pole pairs of the rotor core matched with the stator core, LCM is the least common multiple, and m is the number of the trimming portions.

7. The stator core according to claim 3, characterized in that: 10°＜α＜15°。 8. The stator core according to claim 1 or 2, characterized in that: The number of the trimming portions is plural and the trimming portions are distributed at intervals along the outer circumference of the yoke portion.

9. A motor, characterized in that: include: The stator core according to any one of claims 1 to 8, comprising a mounting cavity; The rotor core is arranged in the installation cavity.

10. A compressor, characterized in that: include: A shell body, including a receiving cavity inside; The motor according to claim 9 is arranged in the accommodating cavity.

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