Stator punching sheet, stator, permanent magnet motor, compressor and refrigeration equipment

Abstract

The utility model provides a stator punching sheet, a stator, a permanent magnet motor, a compressor and refrigeration equipment. The stator punching sheet comprises a yoke part and a plurality of tooth parts. The plurality of tooth parts are arranged on the inner circumferential surface of the yoke part at intervals, and the adjacent tooth parts and the yoke part jointly define a stator slot; wherein the outer circumferential surface of the yoke part comprises a plurality of tooth part arc sections arranged at intervals in the circumferential direction, a plurality of groove part arc sections arranged between every two adjacent tooth part arc sections, and concave parts arranged between the adjacent tooth part arc sections and groove part arc sections and / or between every two adjacent groove part arc sections. The number of the stator slots is recorded as Z, and Z is an integral multiple of 3; the number of the tooth part arc sections is M, the number of the concave parts is P, and the number of the groove part arc sections is N; the ratio of Z to M is an integer, P + M = Z, and M + N = P. The stator punching sheet can improve electromagnetic noise of a permanent magnet motor and a compressor.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment, and in particular to a stator lamination, a stator, a permanent magnet motor, a compressor, and refrigeration equipment. Background Technology

[0002] With the trend of miniaturization and high efficiency in air conditioners, there is also a demand for smaller and more efficient compressors. As a core component of the compressor, the motor also needs to be miniaturized and made more efficient.

[0003] Permanent magnet motors are widely used in the field of household air conditioning refrigeration compressors due to their characteristics such as high torque density, low manufacturing cost, and wide high efficiency range. To improve the flow capacity of refrigeration oil in the stator core of a permanent magnet motor, the outer circumferential surface of the stator laminations is usually punched and trimmed.

[0004] Adopting a multi-polarization motor structure has a significant effect on improving the power density of permanent magnet motors and reducing the size of compressors. Currently, the mainstream rotor pole and stator slot combinations are 4 poles and 6 slots and 6 poles and 9 slots. To achieve multi-polarization of permanent magnet motors, an 8 pole and 12 slots or 10 poles and 15 slots structure is required. However, since the cut edges correspond one-to-one with the teeth of the stator laminations, the number of cut edges can easily affect the motor's performance and cause significant electromagnetic noise. Utility Model Content

[0005] One objective of this invention is to provide a stator lamination that can improve the electromagnetic noise of permanent magnet motors and compressors.

[0006] Another objective of this invention is to provide a stator that solves the aforementioned problems.

[0007] Another objective of this invention is to provide a permanent magnet motor that solves the aforementioned problems.

[0008] Another objective of this invention is to provide a compressor that solves the aforementioned problems.

[0009] Another objective of this invention is to provide a refrigeration device that solves the aforementioned problems.

[0010] According to one aspect of the present invention, a stator lamination is provided, the stator lamination including a yoke and a plurality of teeth.

[0011] Multiple teeth are spaced apart on the inner circumferential surface of the yoke, and adjacent teeth and the yoke together define the stator slot; wherein the outer circumferential surface of the yoke includes multiple tooth arc segments spaced apart along the circumferential direction, multiple slot arc segments disposed between two adjacent tooth arc segments, and recesses disposed between adjacent tooth arc segments and slot arc segments and / or between two adjacent slot arc segments.

[0012] The number of stator slots is denoted as Z, where Z is an integer multiple of 3; the number of tooth arc segments is denoted as M; the number of recesses is denoted as P; and the number of slot arc segments is denoted as N. The ratio of Z to M is an integer, where P+M=Z and M+N=P.

[0013] Optionally, multiple toothed arc segments are evenly spaced along the circumferential direction on the outer peripheral surface of the yoke. The number of stator slots is 9, the number of toothed arc segments is 3, the number of recesses is 6, and the number of grooved arc segments is 3; or the number of stator slots is 12, the number of toothed arc segments is 3, the number of recesses is 9, and the number of grooved arc segments is 6; or the number of stator slots is 12, the number of toothed arc segments is 4, the number of recesses is 8, and the number of grooved arc segments is 4; or the number of stator slots is 15, the number of toothed arc segments is 3, the number of recesses is 12, and the number of grooved arc segments is 9; or the number of stator slots is 15, the number of toothed arc segments is 5, the number of recesses is 10, and the number of grooved arc segments is 5.

[0014] Optionally, the angle formed between the two ends of each tooth arc segment and the center of the stator lamination is denoted as α. i The angle formed by the two ends of each arc segment of the slot and the center of the stator lamination is denoted as β. j Where 45°≤Z*β j <360°≤Z*α i <720°.

[0015] Alternatively, 90°≤Z*β j ≤180°, and 360°≤Z*α i ≤540°.

[0016] Optionally, the centerline of each tooth arc segment and the concave portion coincides with the centerline of a tooth; and each groove arc segment corresponds to a stator slot in the radial direction; the radii of the tooth arc segment and the groove arc segment are the same; and the distance from any point on the contour line of the concave portion to the center of the stator lamination is less than the radii of the tooth arc segment and the groove arc segment.

[0017] Optionally, at least two recesses may have different outline shapes.

[0018] According to another aspect of the present invention, a stator is also provided, the stator including a stator core comprising any of the stator laminations described above.

[0019] According to another aspect of the present invention, the present invention also provides a permanent magnet motor, which includes the stator described above.

[0020] According to another aspect of the present invention, the present invention also provides a compressor comprising the aforementioned permanent magnet motor.

[0021] According to another aspect of the present invention, the present invention also provides a refrigeration device, which includes the above-described compressor.

[0022] In the stator lamination of this invention, the outer peripheral surface of the yoke includes multiple toothed arc segments spaced apart along the circumferential direction, multiple slotted arc segments disposed between two adjacent toothed arc segments, and recesses disposed between adjacent toothed arc segments and slotted arc segments and / or between two adjacent slotted arc segments. The number of stator slots is denoted as Z, where Z is an integer multiple of 3; the number of toothed arc segments is denoted as M; the number of recesses is denoted as P; and the number of slotted arc segments is denoted as N. The ratio of Z to M is an integer, P+M=Z, M+N=P. By arranging mutually spaced toothed arc segments along the circumferential direction and defining the quantitative relationship between stator slots, toothed arc segments, and slotted arc segments, the stator lamination of this invention can improve the natural frequency and stiffness of the stator. When the permanent magnet motor is fixed to the housing using methods such as heat fitting, it can suppress the uneven stress generated in the stator, thereby improving the electromagnetic noise of the permanent magnet motor and the compressor.

[0023] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of some specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0024] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0025] Figure 1 This is a schematic diagram of a stator lamination according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a stator lamination according to another embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of a stator lamination according to another embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of a stator lamination according to another embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of a stator lamination according to another embodiment of the present invention;

[0030] Figure 6 This is a cross-sectional schematic diagram of a compressor according to an embodiment of the present invention;

[0031] Figure 7 This is another cross-sectional schematic diagram of a compressor according to one embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of a refrigeration device according to an embodiment of the present invention. Detailed Implementation

[0033] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0034] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," etc., may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature.

[0035] In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0036] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "coupling," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Furthermore, in the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0038] In other words, in the description of this utility model, "above," "on top of," and "over" the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. "Below," "under," or "below" the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicating that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this utility model, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, device, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, devices, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of the embodiments of this utility model shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] Figure 1 This is a schematic diagram of a stator lamination 10 according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a stator lamination 10 according to another embodiment of the present invention; Figure 3 This is a schematic diagram of a stator lamination 10 according to another embodiment of the present invention; Figure 4 This is a schematic diagram of a stator lamination 10 according to another embodiment of the present invention; Figure 5 This is a schematic diagram of a stator lamination 10 according to another embodiment of the present invention.

[0042] refer to Figures 1 to 5As shown, this utility model provides a stator lamination 10, which includes a yoke 11 and a plurality of teeth 12. The plurality of teeth 12 are spaced apart on the inner circumferential surface of the yoke 11, and adjacent teeth 12 and the yoke 11 together define a stator groove 12A; wherein the outer circumferential surface of the yoke 11 includes a plurality of tooth arc segments 111 spaced apart along the circumferential direction, a plurality of groove arc segments 112 disposed between two adjacent tooth arc segments 111, and a recess 113 disposed between adjacent tooth arc segments 111 and groove arc segments 112 and / or between two adjacent groove arc segments 112.

[0043] The yoke 11 of the stator lamination 10 is generally annular. The diameters of the toothed arc segments 111 and the grooved arc segments 112 on its outer circumferential surface are equal. The recess 113 is recessed towards the inside of the stator lamination 10 relative to the toothed arc segments 111 and the grooved arc segments 112 to form the oil return channel of the compressor 50. The toothed arc segments 111, the grooved arc segments 112, and the recess 113 connecting them together constitute the outer circumferential surface of the yoke 11 of the stator lamination 10. The teeth 12 of the stator lamination 10 are evenly distributed on the inner circumferential surface of the yoke 11 and extend towards the inside of the stator lamination 10.

[0044] One major source of noise in compressor 50 is electromagnetic noise. This electromagnetic noise primarily arises from the periodic action of radial electromagnetic force waves generated by the interaction between the armature magnetic field of the stator 20 of the permanent magnet motor 40 and the permanent magnet magnetic field of the rotor 30 on the inner diameter surface of the stator 20. This causes periodic deformation of the stator 20, resulting in vibration noise. Electromagnetic noise is closely related to the electromagnetic excitation force and the natural frequency and stiffness of the stator 20. When the frequency of the radial electromagnetic force acting on the surface of the stator 20 is close to its natural frequency, it can cause motor resonance, generating significant vibration noise. Therefore, it is necessary to optimize the structure of the stator laminations 10, increasing their stiffness and raising their natural frequency.

[0045] Therefore, this embodiment specifically improves the inner and outer circumferential shapes of the stator lamination 10. Specifically, the number of slots 12A in the stator 20 is Z, where Z is an integer multiple of 3; the number of tooth arc segments 111 is M; the number of recesses 113 is P; and the number of groove arc segments 112 is N. The relationship between the number of slots 12A, tooth arc segments 111, and groove arc segments 112 in the stator 20 satisfies that the ratio of Z to M is an integer, P+M=Z, M+N=P. This arrangement not only ensures the flow area of ​​the stator 20 with the stator lamination 10, improving the oil return rate of the permanent magnet motor 40, but also suppresses the stress imbalance in the stator 20 of the permanent magnet motor 40, improves the stiffness and natural frequency of the stator 20, and reduces the electromagnetic noise of the permanent magnet motor 40 and the compressor 50.

[0046] refer to Figures 1 to 5As shown, in some optional embodiments, the number of stator slots 12A can be limited to 9, 12, or 15. The applicant has found that after multi-polarization, the maximum speed of the permanent magnet motor 40 decreases when the maximum drive frequency is determined. Since the number of rotor poles 30 corresponds to the number of stator slots 12A, limiting the number of stator slots 12A to a maximum of 15 ensures that the maximum speed of the permanent magnet motor 40 reaches the specified value. Furthermore, limiting the number of stator slots 12A to a minimum of 9 ensures that the number P of recesses 113 is not too small, thereby ensuring sufficient oil return from the compressor 50.

[0047] refer to Figure 1 As shown, when the number of stator slots 12A Z is 9, the number of tooth arc segments 111 M is 3, Z:M=3, the number of recesses 113 P is 6, and the number of slot arc segments 112 N is 3.

[0048] refer to Figure 2 As shown, when the number of stator slots 12A is Z, the number of tooth arc segments 111 is M, which can be 3, Z:M = 4, the number of recesses 113 is P, and the number of slot arc segments 112 is N, which can be 6.

[0049] refer to Figure 3 As shown, when the number of stator slots 12A Z is 12, the number of tooth arc segments 111 M can also be 4, Z:M = 3, the number of recesses 113 P is 8, and the number of slot arc segments 112 N is 4.

[0050] refer to Figure 4 As shown, when the number of stator slots 12A Z is 15, the number of tooth arc segments 111 M can be 3, Z:M = 5, the number of recesses 113 P is 12, and the number of slot arc segments 112 N is 9.

[0051] refer to Figure 5 As shown, when the number of stator slots 12A Z is 15, the number of tooth arc segments 111 M can also be 5, Z:M = 3, the number of recesses 113 P is 10, and the number of slot arc segments 112 N is 5.

[0052] In the above embodiments, the fact that multiple tooth arc segments 111 are equally spaced along the circumferential direction on the outer peripheral surface of the yoke 11 means that the spacing angle of each tooth arc segment 111 is equal. In embodiments where the number of tooth arc segments 111 is M = 3, the angle formed between the same end (either the end in the clockwise direction or the end in the counterclockwise direction shown in the figure) of any two adjacent tooth arc segments 111 and the center of the stator lamination 10 is 360° / M = 360° / 3 = 120°. In embodiments where the number of tooth arc segments 111 is M = 4, the angle formed between the same end of any two adjacent tooth arc segments 111 and the center of the stator lamination 10 is 360° / M = 360° / 4 = 90°. In an embodiment where the number of tooth arc segments 111 is 5, the angle formed between the same end of any two adjacent tooth arc segments 111 and the center of the stator lamination 10 is 360° / M = 360° / 5 = 72°.

[0053] In some alternative embodiments, the angle formed between the two ends of each tooth arc segment 111 and the center of the stator lamination 10 is denoted as α. i The angle formed by the two ends of each arc segment 112 of the slot and the center of the stator lamination 10 is denoted as β. j Where 45°≤Z*β j <360°≤Z*α i <720°.

[0054] Here, i and j refer to the i-th tooth arc segment 111 and the j-th groove arc segment 112, which can be understood as... Figures 1 to 5 The markings α1, α2, β1, β2, etc. shown are merely schematic diagrams for the purpose of understanding the positional range of the tooth arc segment 111 and the groove arc segment 112, and do not contain any limitation on the positional relationship between the tooth arc segment 111 and the groove arc segment 112.

[0055] refer to Figures 1 to 5 As shown, in different embodiments, the number of stator slots 12A in the stator lamination 10 is set differently, and the corresponding number of tooth arc segments 111 and slot arc segments 112 are also set differently. This embodiment limits the included angle α between the two ends of each tooth arc segment 111. i The included angle β between the two ends of each groove arc segment 112 j The size is within 45° ≤ Z*β j <360°≤Z*α i Within the range of <720°, i.e., α i Less than twice the mechanical slot pitch angle, β j A smaller angle than the mechanical slot pitch angle can prevent the inability to set multiple complete recesses 113, and at the same time prevent the area of ​​a single oil return cut on the stator lamination 10 from being too small, which would affect the smoothness of oil return and effectively ensure the cooling performance of the refrigeration equipment.

[0056] The mechanical slot pitch angle refers to the geometric angle between two adjacent stator slots 12A, and its value is equal to 360° / Z.

[0057] In some alternative implementations, the included angle α between the two ends of each tooth arc segment 111 is... i The included angle β between the two ends of each groove arc segment 112 j The size can also be further limited to 90°≤Z*β j ≤180°, and 360°≤Z*α i ≤540°, to further avoid the area of ​​a single oil return cut on the stator lamination 10 being too large, which would affect the stress imbalance, stiffness and natural frequency of the stator 20, and help to achieve a low-noise design for the overall refrigeration equipment.

[0058] In some alternative embodiments, the center lines of each tooth arc segment 111 and the recess 113 coincide with the center line of a tooth 12; and each groove arc segment 112 corresponds to a stator slot 12A in the radial direction; the radii of the tooth arc segment 111 and the groove arc segment 112 are the same; and the distance from any point on the contour line of the recess 113 to the center of the stator lamination 10 is less than the radii of the tooth arc segment 111 and the groove arc segment 112.

[0059] The center lines of the tooth arc segment 111, the recess 113, and the tooth segment 12 all refer to the straight lines between the centers of their two ends in the circumferential direction and the center of the stator lamination 10. The radial correspondence of the groove arc segment 112 to a stator slot 12A means that the area where the groove arc segment 112 is located is covered by the area where the stator slot 12A is located in the radial extension direction, or in other words, the groove arc segment 112 is located between the two ends of the stator slot 12A in the circumferential direction in the radial extension direction.

[0060] In this embodiment, the stator lamination 10 enhances the structural strength and rigidity of the stator 20. When the permanent magnet motor 40 is fixed to the housing using methods such as heat fitting, it can suppress stress imbalance in the stator 20.

[0061] In some alternative implementations, at least two recesses 113 have different outline shapes.

[0062] The outline of each recess 113 can be a straight line, an arc, or other irregular line. In this embodiment, at least two recesses 113 in the stator lamination 10 have different outline shapes, meaning that the outlines of at least two recesses 113 cannot be superimposed by rotation. This embodiment utilizes the different outline shapes of at least two recesses 113 to achieve an asymmetrical design of the stator lamination 10, thereby ensuring that the stator lamination 10 has better error prevention.

[0063] Figure 6 This is a cross-sectional schematic diagram of a compressor 50 according to an embodiment of the present invention; Figure 7 This is another cross-sectional schematic diagram of a compressor 50 according to an embodiment of the present invention; Figure 8 This is a schematic diagram of a refrigeration device 60 according to an embodiment of the present invention.

[0064] refer to Figure 6 and Figure 7 As shown, this utility model also provides a stator 20, a permanent magnet motor 40, and a compressor 50. The stator 20 includes a stator core 21 and windings 22. The stator core 21 is composed of multiple stator laminations 10 axially stacked. The windings 22 are fixed in the axial space formed by connecting the stator slots 12A of each stator lamination 10. The permanent magnet motor 40 includes a stator 20 and a rotor 30. The rotor 30 includes a rotor core 31 and permanent magnets 32 fixed on the rotor core 31. After the windings 22 of the stator 20 are energized, the rotor 30 rotates under the drive of the permanent magnets 32. The compressor 50 includes a housing 51 and a permanent magnet motor 40. The permanent magnet motor 40 is typically fixed inside the housing 51 by methods such as heat fitting.

[0065] refer to Figure 8 As shown, this utility model also provides a refrigeration device 60, which includes a compressor 50. The refrigeration device 60 in this embodiment includes, but is not limited to, devices with refrigeration functions such as refrigerators and air conditioners, and is not limited thereto.

[0066] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A stator lamination, characterized in that... include: yoke; and Multiple teeth are spaced apart on the inner circumferential surface of the yoke, and adjacent teeth and the yoke together define a stator slot; in The outer peripheral surface of the yoke includes a plurality of toothed arc segments spaced apart along the circumferential direction, a plurality of grooved arc segments disposed between two adjacent toothed arc segments, and a recess disposed between adjacent toothed arc segments and grooved arc segments and / or between two adjacent grooved arc segments; and The number of stator slots is denoted as Z, where Z is an integer multiple of 3; The number of the toothed arc segments is denoted as M, the number of the recesses is denoted as P, and the number of the groove arc segments is denoted as N; the ratio of Z to M is an integer, P+M=Z, M+N=P.

2. The stator lamination according to claim 1, characterized in that... The plurality of toothed arc segments are equally spaced along the circumferential direction on the outer peripheral surface of the yoke; and The number of stator slots is 9, the number of tooth arc segments is 3, the number of recesses is 6, and the number of slot arc segments is 3; or The number of stator slots is 12, the number of tooth arc segments is 3, the number of recesses is 9, and the number of slot arc segments is 6; or The number of stator slots is 12, the number of tooth arc segments is 4, the number of recesses is 8, and the number of slot arc segments is 4; or The number of stator slots is 15, the number of tooth arc segments is 3, the number of recesses is 12, and the number of slot arc segments is 9; or The number of stator slots is 15, the number of tooth arc segments is 5, the number of recesses is 10, and the number of slot arc segments is 5.

3. The stator lamination according to claim 1, characterized in that... The angle formed by the two ends of each of the toothed arc segments and the center of the stator lamination is denoted as α. i The angle formed by the two ends of each arc segment of the groove and the center of the stator lamination is denoted as β. j ;in 45°≤Z*β j <360°≤Z*α i <720°.

4. The stator lamination according to claim 3, characterized in that... 90° ≤ Z * β j ≤ 180°, and 360° ≤ Z * α i ≤ 540°.

5. The stator lamination according to claim 1, characterized in that... The centerline of each of the tooth arc segments and the concave portion coincides with the centerline of one of the teeth; Each of the aforementioned arc segments of the slot corresponds to one of the stator slots in the radial direction; The radius of the arc segment of the tooth and the arc segment of the groove are the same; and The distance from any point on the contour line of the recess to the center of the stator lamination is less than the radius of the arc segment of the tooth and the arc segment of the groove.

6. The stator lamination according to claim 5, characterized in that, At least two of the recesses have different outline shapes.

7. A stator, characterized in that... include: A stator core comprising a plurality of stator laminations according to any one of claims 1 to 6.

8. A permanent magnet motor, characterized in that... Includes the stator according to claim 7.

9. A compressor, characterized in that... Including the permanent magnet motor according to claim 8.

10. A refrigeration device, characterized in that... Includes the compressor according to claim 9.

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