Stator lamination and stator core, motor, compressor and refrigeration device having the same

Abstract

This invention discloses a stator lamination and a stator core, motor, compressor, and refrigeration equipment having the same. The stator lamination includes a stator yoke and multiple stator teeth. The stator teeth are spaced apart circumferentially on the inner side of the stator yoke and extend radially inward along the stator yoke. In a plane perpendicular to the axis of the stator lamination, the outer contour of the stator yoke includes multiple arc segments. These arc segments are distributed on the same circumference and connected by a transition segment. The transition segment is a smooth curve segment with a diameter D. The two ends of the transition segment connect to the arc segments. The distance from all points on the transition segment (excluding the two ends) to the center of the circumference is X, where X < D / 2. The central angle of each arc segment is θ, where 9° ≤ θ < 90°. According to this invention, the stator lamination improves frequency stability and reduces noise generated under high-frequency carrier waves.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a stator lamination and a stator core having the same, a motor, a compressor, and a refrigeration device. Background Technology

[0002] Currently, most household air conditioner compressors use inverter motors. The input current of an inverter motor is a modulated wave, and the carrier wave of the modulated wave is a high-frequency carrier wave. When the stator laminations are not designed properly, the noise and vibration of the motor and compressor in the frequency band near the carrier wave will deteriorate, seriously affecting the user's auditory experience. At the same time, the deterioration of vibration will also directly affect the product's service life. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, the present invention proposes a stator lamination that improves the fixed-frequency operation of the stator lamination and reduces noise generated under high-frequency carrier waves.

[0004] The present invention also proposes a stator core having the above-mentioned stator laminations.

[0005] The present invention also proposes a motor having the above-mentioned stator core.

[0006] The present invention also proposes a compressor having the above-mentioned motor.

[0007] The present invention also proposes a refrigeration device having the above-described compressor.

[0008] According to an embodiment of the present invention, a stator lamination includes a stator yoke and a plurality of stator teeth. The plurality of stator teeth are spaced apart circumferentially on the inner side of the stator yoke and extend radially inward along the stator yoke. In a plane perpendicular to the axis of the stator lamination, the outer contour of the stator yoke includes a plurality of arc segments. The plurality of arc segments are distributed on the same circumference and adjacent arc segments are connected by a transition segment. The transition segment is a smooth curve segment. The diameter of the circumference is D. The two ends of the transition segment are connected to the arc segments. The distance from the remaining points on the transition segment (excluding the two ends) to the center of the circumference is X. X and D satisfy: X < D / 2. The central angle of each arc segment is θ, and θ satisfies: 9° ≤ θ < 90°.

[0009] According to an embodiment of the present invention, the stator lamination includes a stator yoke and a plurality of stator teeth. The outer surface of the stator yoke includes a plurality of arc segments, and two adjacent arc segments are connected by a transition segment, thereby improving the fixed frequency of the stator lamination and reducing high-frequency carrier noise.

[0010] According to some embodiments of the present invention, a stator slot is formed between two adjacent stator teeth, and the number of stator slots is Q, where Q satisfies: Q≤12.

[0011] According to some embodiments of the present invention, the number of the arc segments is k, and k and Q satisfy: 4≤k<Q / 2.

[0012] According to some embodiments of the present invention, the arc segment is disposed radially outside the stator slot.

[0013] According to some embodiments of the present invention, the arc segment is disposed on the radially outer side of the stator teeth.

[0014] According to some embodiments of the present invention, the multiple transition segments have the same structure.

[0015] According to some embodiments of the present invention, at least two of the transition segments have different structures.

[0016] According to another embodiment of the present invention, a stator core includes a plurality of the above-described stator laminations, wherein the plurality of stator laminations are stacked sequentially.

[0017] The stator core improves stator frequency stability and reduces high-frequency carrier noise.

[0018] According to another embodiment of the present invention, an electric motor includes a rotor and the stator core described above, wherein the number of pole pairs of the rotor is not greater than 5.

[0019] The motor improves stator frequency fixation and reduces high-frequency carrier noise.

[0020] The compressor according to another aspect of the present invention includes the motor described above.

[0021] The compressor improves stator frequency stability and reduces high-frequency carrier noise.

[0022] A refrigeration device according to another aspect of the present invention includes the compressor described above.

[0023] The cooling device improves stator frequency fixation and reduces high-frequency carrier noise.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[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 the central angle of the arc segment in the stator lamination according to an embodiment of the present invention;

[0027] Figure 3 This is a noise comparison diagram of a compressor according to an embodiment of the present invention and a conventional compressor under a 60rps high-frequency carrier wave.

[0028] Figure 4 This is a noise comparison diagram of a compressor according to an embodiment of the present invention and a conventional compressor under a 90 rpm high-frequency carrier wave.

[0029] Reference numerals: stator lamination 100, stator yoke 10, arc segment 11, transition segment 12, first curve segment 121, second curve segment 122, stator tooth segment 20, stator slot segment 30. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 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. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," 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, an electrical connection, or a connection that allows communication between them; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] The following is combined with Figures 1-4 The stator lamination 100, stator core, motor, compressor, and refrigeration equipment according to embodiments of the present invention are described in detail.

[0035] Reference Figure 1 and Figure 2 As shown, the stator lamination 100 according to an embodiment of the present invention may include a stator yoke 10 and a plurality of stator teeth 20. The plurality of stator teeth 20 are spaced apart circumferentially on the inner side of the stator yoke 10, and extend radially inward along the stator yoke 10. Optionally, the radially outer end of the stator teeth 20 is connected to the inner peripheral edge of the stator yoke 10, and the radially inner end of the stator teeth 20 extends toward the center of the stator yoke 10. In a plane perpendicular to the axis of the stator lamination, the outer contour of the stator yoke 10 includes a plurality of arc segments 11, which are distributed on the same circumference. Adjacent arc segments 11 are connected by a transition segment 12, which is a smooth curve segment. Optionally, the arc segments 11 are connected by smooth curve segments, which can extend the service life of the stator lamination 100 stamping die. In addition, the smooth curve segments can also alleviate the deformation of the stator lamination 100 and eliminate the stress concentration phenomenon during the stamping of the stator lamination 100.

[0036] The diameter of the circumference is D, and the distance from a point on the transition segment 12 to the center of the circumference is X. X and D satisfy the relationship: X < D / 2. Therefore, the transition segment 12 is not on the circumference of the arc segment 11. Connecting the two ends of the transition segment 12 to the arc segment 11, the distance X from the remaining points on the transition segment 12 (excluding the two ends) to the center of the circumference is limited to X < D / 2. This optimizes the structure of the stator yoke 10, making the magnetic flux density of the teeth and the magnetic flux density of the stator lamination 100 tend to be balanced, improving the frequency stability of the stator lamination 100, which is beneficial for reducing noise generated under high-frequency carrier waves and increasing the service life of the stator lamination 100. At the same time, it can also reduce the amount of material used and reduce the weight of the stator lamination 100.

[0037] In actual products, the stator lamination 100 has a certain thickness. Therefore, in the axial direction of the stator lamination 100, the arc segment 11 is constructed as an arc surface, the transition segment 12 is constructed as a transition surface, and the aforementioned circumferential structure is a cylindrical surface. According to an embodiment of the present invention, the stator lamination 100 includes a stator yoke 10 and a plurality of stator teeth 20. The outer contour of the stator yoke 10 includes a plurality of arc segments 11, and adjacent arc segments 11 are connected by a transition segment 12, which improves the frequency stability of the stator lamination 100 and reduces noise generated under high-frequency carrier waves.

[0038] In some embodiments of the present invention, reference is made to... Figure 2As shown, the central angle of each arc segment 11 is θ, which satisfies the relationship: 9°≤θ<90°. Optionally, θ can be 9°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 89°, etc. Of course, θ can also be other values ​​between 9° and 90°, which will not be listed here.

[0039] In some embodiments of the present invention, reference is made to... Figure 1 As shown, stator slots 30 are formed between two adjacent stator teeth 20. The number of stator slots 30 is Q, and Q satisfies the relationship: Q≤12. Optionally, Q=1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and the number of stator teeth 20 is equal to the number of stator slots 30. The more stator slots 30 there are, the more stator teeth 20 there are, which is more beneficial for reducing the fixed frequency of the electronic lamination, thereby reducing the noise generated under high-frequency carrier waves.

[0040] In some embodiments of the present invention, the number of arc segments 11 is k, and k and Q satisfy the relationship: 4 ≤ k < Q / 2. Optionally, when Q = 12, 4 ≤ k < 6, and the value of k is 4 or 5; similarly, when Q = 10, 4 ≤ k < 5, and the value of k is 4. Figure 1 As shown, the stator yoke 10 includes four arc segments 11, which are evenly distributed along the circumference. In some embodiments not shown in this invention, the stator yoke 10 includes five arc segments 11.

[0041] In some embodiments of the present invention, reference is made to... Figure 1 As shown, the arc segment 11 is disposed radially outside the stator slot 30. Optionally, the centerline of the arc segment 11 is aligned with the centerline of the stator slot 30. In some embodiments, the centerline of the arc segment 11 is offset from the centerline of the stator slot 30.

[0042] In some embodiments of the present invention, reference is made to... Figure 1 As shown, the arc segment 11 is disposed radially outside the stator tooth portion 20. Optionally, the center line of the arc segment 11 is aligned with the center line of the stator tooth portion 20. In some embodiments, the center line of the arc segment 11 is separate from the center line of the stator tooth portion 20.

[0043] It is understood that, in the embodiments of the present invention, the "center line of the arc segment 11" refers to the center line of symmetry of the arc segment 11 in a plane perpendicular to the axis of the stator lamination 100, the "center line of the stator slot 30" refers to the center line of symmetry of the stator slot 30 in a plane perpendicular to the axis of the stator lamination 100, and the "center line of the stator tooth 20" refers to the center line of symmetry of the stator tooth 20 in a plane perpendicular to the axis of the stator lamination 100. Figure 1As shown, the center line of the arc segment 11 is L1, the center line of the stator slot 30 is L2, and the center line of the stator tooth 20 is L3.

[0044] In some embodiments of the present invention, the multiple transition segments 12 have the same structure. Optionally, the multiple transition segments 12 are curved segments with the same shape, and the center of the curved segment can be located inside or outside the circumference.

[0045] In some embodiments of the present invention, reference is made to... Figure 1 As shown, at least two transition segments 12 have different structures. Optionally, adjacent transition segments 12 may have different degrees of curvature and different lengths.

[0046] In some embodiments of the present invention, reference is made to... Figure 1 As shown, the smooth curve segment includes a first curve segment 121 and a second curve segment 122. The first curve segment 121 and the second curve segment 122 are connected, and the concave and convex directions of the first curve segment 121 and the second curve segment 122 are different. For example, relative to the center of the circumference, the first curve segment 121 is concave and the second curve segment 122 is convex. However, the first curve segment 121 and the second curve segment 122 are still located inside the aforementioned circumference, which helps to further improve the fixation of the stator lamination and reduce the noise generated on the high-frequency carrier. The number of first curve segments 121 in each transition segment 12 can be one or more; the number of second curve segments 122 in each transition segment 12 can also be one or more.

[0047] The following provides a specific embodiment of a stator lamination 100 according to an embodiment of the present invention.

[0048] The stator lamination 100 includes a stator yoke 10 and 12 stator teeth 20. The 12 stator teeth 20 are spaced apart circumferentially on the inner side of the stator yoke 10 and extend radially inward along the stator yoke 10. The outer contour of the stator yoke 10 includes four arc segments 11, which are distributed on the same circumference. Adjacent arc segments 11 are connected by a transition segment 12, which is a smooth curve segment. The diameter of the circumference is D, and the distance from a point on the transition segment 12 to the center of the circumference is X. X and D satisfy the relationship: X < D / 2.

[0049] The central angle θ of the arc segment 11 is 20°. A stator slot 30 is formed between two adjacent stator teeth 20. The number of slots Q of the stator slot 30 is equal to the number of stator teeth 20, and the number of slots Q = 12. The arc segment 11 is located on the radially outer side of the stator slot 30, and the center line of the arc segment 11 is offset from the center line of the stator slot 30, and the center line of the arc segment 11 is separated from the center line of the stator teeth 20.

[0050] Each transition segment 12 includes a first curved segment 121 and a second curved segment 122, the first curved segment 121 and the second curved segment 122 are connected, the first curved segment 121 is concave with respect to the center of the circumference, and the second curved segment 122 is convex, both the first curved segment 121 and the second curved segment 122 are located inside the aforementioned circumference. Each transition segment 12 has 3 first curved segments 121 and 2 second curved segments 122.

[0051] According to another embodiment of the present invention, the stator core includes a plurality of stator laminations 100 as described above, which are stacked sequentially. Optionally, the stator core further includes a winding, which includes a plurality of coils, each coil being wound on the stator tooth portion 20 of the stator lamination 100. This helps to reduce copper loss and facilitates modular production, thereby improving manufacturing efficiency. In actual design, the stator yoke portions 10 of two adjacent stator laminations 100 are detachably connected. For example, an insertion structure can be provided on the opposing surfaces of the two stator yoke portions 10. An insertion protrusion can be provided on the surface of one stator yoke portion 10, and an insertion groove can be provided on the surface of the other stator yoke portion 10. The insertion protrusion is then inserted into the insertion groove to achieve the insertion fit of adjacent stator yoke portions 10, which facilitates flexible disassembly and installation. The stator core of the present invention improves stator frequency fixation and reduces noise generated on high-frequency carrier waves.

[0052] According to another embodiment of the present invention, the motor includes a rotor and the aforementioned stator core, wherein the number of pole pairs of the rotor is not greater than 5. Optionally, the number of pole pairs of the rotor can be 1 pair, 2 pairs, 3 pairs, 4 pairs, or 5 pairs. Optionally, the stator core is sleeved outside the rotor, and the rotor includes a magnetic ring and a rotating shaft. The magnetic ring is fixedly sleeved outside the rotating shaft, and the magnetic ring can be fixedly connected to the rotating shaft circumferentially so that the magnetic ring and the rotating shaft rotate together relative to the stator core. The motor of the present invention improves stator fixed frequency and reduces high-frequency carrier noise.

[0053] A compressor according to another embodiment of the present invention includes the aforementioned motor. For example... Figure 3 and Figure 4 As shown, the compressor of this embodiment generates lower noise under both 60 rpm and 90 rpm high-frequency carrier waves than a conventional compressor. The compressor of this embodiment improves stator frequency fixation, reducing noise generated under high-frequency carrier waves.

[0054] A refrigeration device according to another embodiment of the present invention includes the compressor described above. The refrigeration device of this embodiment improves stator frequency stability and reduces noise generated under high-frequency carrier waves.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0056] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A stator lamination, characterized in that, include: The stator yoke (10) and a plurality of stator teeth (20) are provided. The plurality of stator teeth (20) are spaced apart circumferentially on the inner side of the stator yoke (10), and the stator teeth (20) extend radially inward along the stator yoke (10). In a plane perpendicular to the axis of the stator lamination, the outer contour of the stator yoke (10) includes a plurality of arc segments (11), which are distributed on the same circumference. The arc segments (11) are connected by transition segments (12), which are smooth curve segments. The diameter of the circumference is D. The two ends of the transition segment (12) are connected to the arc segments (11). The distance from the remaining points on the transition segment (12) other than the two ends to the center of the circumference is X. X and D satisfy: X < D / 2. The central angle of each arc segment (11) is θ, which satisfies: 9° ≤ θ < 90°. A stator slot (30) is formed between two adjacent stator teeth (20), the number of the stator slot (30) is Q, and the number of the arc segments (11) is k, where k and Q satisfy: 4≤k<Q / 2.

2. The stator lamination according to claim 1, characterized in that, Q satisfies: Q≤12.

3. The stator lamination according to claim 1, characterized in that, The arc segment (11) is located on the radial outer side of the stator slot (30).

4. The stator lamination according to claim 1, characterized in that, The arc segment (11) is located on the radial outer side of the stator tooth portion (20).

5. The stator lamination according to claim 1, characterized in that, The structures of the multiple transition segments (12) are identical.

6. The stator lamination according to claim 1, characterized in that, At least two of the transition segments (12) have different structures.

7. A stator core, characterized in that, It includes a plurality of stator laminations as described in any one of claims 1-6, wherein the plurality of stator laminations are stacked sequentially.

8. An electric motor, characterized in that, It includes a rotor and a stator core as described in claim 7, wherein the rotor has no more than 5 pole pairs.

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

10. A refrigeration device, characterized in that, Includes the compressor as described in claim 9.

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