Stator and compressor comprising same

Abstract

The present application relates to a stator and a motor and compressor comprising the same. In particular, a stator for an electromagnetic device is provided, the stator being interference-fitted to a fixed structure, the stator comprising: a first stator core unit comprising at least two first boss portions interference-fitted to the fixed structure; a second stator core unit comprising at least two second boss portions interference-fitted to the fixed structure, wherein the first stator core unit and the second stator core unit are stacked in a direction of a central axis of the stator such that the first boss portions and the second boss portions are at least partially offset from each other when viewed in the direction of the central axis. The stator according to the present application and the motor and compressor comprising the same can significantly enhance the vibration damping in the radial direction of the stator, thereby effectively reducing vibration and noise, and have a simple structure, easy to manufacture and process, and a high cost-effectiveness.

Description

Technical Field

[0001] The present invention relates to a stator and an electric motor and compressor including the stator. Background Technology

[0002] This section provides background information related to the present invention, which does not necessarily constitute prior art.

[0003] An electric motor, also known as a "motor," includes generators and electric motors. An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque to serve as a power source for electrical appliances or various machines. Therefore, electric motors are an important component of many common devices—such as generators, starters, and compressors. An electric motor mainly consists of a stationary stator and a rotor, which is concentrically and circumferentially opposite the stator and can rotate relative to the stator about its central axis. The stator includes a stator core and stator windings, and the rotor includes a rotor core and rotor windings. By driving the rotor to rotate relative to the stator, a magnetic field is generated between the stator and rotor, which in turn generates current in the windings to produce electricity (generator), or by applying current to the windings to drive the rotor to rotate to output mechanical power (electric motor).

[0004] The stator core of a conventional motor is formed by stacking silicon steel sheets with a thickness of 0.35 to 0.5 mm coated with insulating varnish. The outer wall of the stator core, formed by stacking many of these silicon steel sheets, includes protruding bosses (also called "interference fits") that typically extend continuously along the central axis, for interference fit with the outer housing, thereby improving stator stability. During motor operation, the high-speed rotation of the rotor generates significant vibration and noise. This vibration propagates from the central axis outwards from the stator. Because the stator core is formed by stacking many very thin silicon steel sheets, it has significant damping along the central axis. However, since the individual silicon steel sheets have identical shapes and structures and are typically centrally symmetrical, they all have the same vibration frequency in the radial direction. The damping in the radial direction is small, resulting in less vibration attenuation in the radial direction. Therefore, a large number of vibration waves propagate radially outwards from the stator core, creating noise. To address this technical problem, existing technologies typically focus on the inherent frequency of the stator structure in an attempt to alleviate the aforementioned issues. However, such improvements are usually rather passive, and a more effective solution is still needed.

[0005] Therefore, there is a need to provide a stator that can effectively improve the above-mentioned and other technical problems, and motors and generators including such a stator. Summary of the Invention

[0006] This section provides a general overview of the invention, rather than a full disclosure of the invention's complete scope or all its features.

[0007] The object of this invention is to improve upon one or more of the technical problems mentioned above. In general, this invention provides a stator capable of increasing the radial vibration damping of the stator core, thereby effectively reducing vibration and noise, as well as a motor and generator including the stator, and an apparatus including the motor or generator.

[0008] According to one aspect of the present invention, a stator for an electromagnetic device is provided, the stator being interference-fitted to a fixed structure, the stator comprising:

[0009] The first stator core unit includes at least two first bosses that are interference-fitted with the fixing structure;

[0010] The second stator core unit includes at least two second bosses that are interference-fitted with the fixing structure.

[0011] The first stator core unit and the second stator core unit are stacked along the central axis of the stator such that adjacent first boss portions and second boss portions are at least partially offset from each other when viewed along the central axis.

[0012] By arranging the first stator core unit and the second stator core unit as described above, the first boss portion and the second boss portion are at least partially offset from each other when viewed along the direction of the central axis—that is, at least partially offset from each other along the circumferential direction of the first stator core unit and the second stator core unit, i.e., at least partially staggered and not completely overlapping. This results in a difference in the radial mass distribution of the stator core composed of the first stator core unit and the second stator core unit, i.e., for adjacent first stator core units and second stator core units, for example, the first boss portions are at least partially stacked. In the portion of the second stator core unit that does not have the second boss, the difference in mass distribution leads to a difference in vibration frequency. Therefore, when the vibration wave propagates radially from the central axis along the first and second stator core units, a difference in vibration frequency occurs at least in the first and second boss portions (and their vicinity or even larger areas) that are at least partially offset from each other. The difference in vibration frequency is greater the closer to the boss portion, causing the vibration waves in the first and second stator core units to interfere with each other. This significantly attenuates the radial vibration of the entire stator core, thereby effectively reducing vibration and noise.

[0013] According to one aspect of the invention, when viewed along the central axis, there is a gap between adjacent first and second boss portions. That is, there are no adjacent or overlapping portions between the first and second boss portions, which results in a larger difference in mass distribution and the area involved, thereby making the effect of reducing vibration and noise more significant.

[0014] According to one aspect of the invention, at least two of the first boss portions have the same size and shape, and at least two of the second boss portions have the same size and shape.

[0015] According to one aspect of the invention, at least two of the first bosses are spaced apart from each other by an equal distance, and at least two of the second bosses are spaced apart from each other by an equal distance.

[0016] According to one aspect of the invention, the first boss portion and the second boss portion have an arcuate shape to interfere with the cylindrical surface of the fixed structure.

[0017] According to one aspect of the invention, the stator includes a plurality of first stator core units and a plurality of second stator core units, the first stator core units and the second stator core units being arranged alternately along the central axis. This results in a uniform mass distribution throughout the stator core composed of the plurality of first stator core units and the plurality of second stator core units, thereby improving structural stability and further enhancing the uniformity of mass distribution differences throughout the stator core, thereby uniformly reducing vibration and noise throughout the stator core.

[0018] According to one aspect of the invention, the first bosses of a plurality of first stator core units are aligned with each other along the direction of the central axis, and the second bosses of a plurality of second stator core units are aligned with each other along the direction of the central axis.

[0019] According to one aspect of the invention, a first groove (S1) is provided on the first stator core unit, the first groove being disposed on the first boss portion and / or disposed between adjacent first boss portions, and / or,

[0020] The second stator core unit is provided with a second groove (S2), which is disposed on the second boss portion and / or between adjacent second boss portions. By providing the groove, airflow can pass through the groove to carry away heat, thereby facilitating heat dissipation of the stator core. Furthermore, the groove disposed on the boss portion further divides the boss portion into multiple boss parts, further increasing the mass distribution difference in the stator core unit and increasing radial damping.

[0021] According to one aspect of the invention, the first grooves of a plurality of first stator core units are aligned along the direction of the central axis, and / or the second grooves of a plurality of second stator core units are aligned along the direction of the central axis.

[0022] According to one aspect of the invention, the first stator core unit is formed by stacking at least two first sheet materials along the direction of the central axis, and the second stator core unit is formed by stacking at least two second sheet materials along the direction of the central axis.

[0023] According to one aspect of the invention, the first stator core unit is composed of 5 to 10 first sheet materials stacked together, and the second stator core unit is composed of 5 to 10 second sheet materials stacked together.

[0024] According to one aspect of the invention, the first stator core unit and the second stator core unit have the same structure. This will result in a more uniform mass distribution for each of the first and second stator core units, thereby creating a uniform mass distribution difference between adjacent first and second stator core units.

[0025] According to one aspect of the invention, the first stator core unit and the second stator core unit have different structures.

[0026] According to one aspect of the invention, the stator further includes a third stator core unit, the third stator core unit including at least two third bosses that are interference-fitted with the fixing structure, the third stator core unit being stacked with the first stator core unit and the second stator core unit along the direction of the central axis such that the third bosses are at least partially offset from each other when viewed along the direction of the central axis.

[0027] Regarding the third stator core unit, it may possess the aforementioned features and combinations thereof of the first and second stator core units. In terms of size and shape, the third stator core unit may be the same as or different from the first and / or second stator core units. By arranging the third stator core unit alternately with the first and second stator core units along the central axis such that the third boss portion is at least partially offset from the first and second boss portions in the circumferential direction, the difference in mass distribution throughout the entire stator core is significantly improved, and thus vibration and noise are significantly reduced.

[0028] According to one aspect of the present invention, an electric motor is also provided, the electric motor comprising:

[0029] The stator as described above; and

[0030] A rotor disposed on the radial inner or outer side of the stator, the rotor being capable of rotating relative to the stator about the central axis of the stator.

[0031] According to one aspect of the present invention, a compressor is also provided, the compressor comprising:

[0032] The stator as described above; and

[0033] A rotor disposed on the radial inner or outer side of the stator, the rotor being capable of rotating relative to the stator about the central axis of the stator.

[0034] In summary, the stator according to the present invention, as well as the motor and compressor including the stator, provides at least the following beneficial effects: it can significantly enhance the vibration damping in the radial direction of the stator, thereby effectively reducing vibration and noise, and has a simple structure, is easy to process and manufacture, and has high cost-effectiveness. Attached Figure Description

[0035] The foregoing and other features and characteristics of the invention will become clearer from the following detailed description with reference to the accompanying drawings, which are by way of example only and are not necessarily drawn to scale. The same reference numerals are used in the drawings to indicate the same parts, in which:

[0036] Figure 1a A stator according to a first exemplary embodiment of the present invention is shown.

[0037] Figure 1b and Figure 1c A partially enlarged view of a stator according to a first exemplary embodiment of the present invention is shown, wherein a perspective view of two stator core units stacked on top of each other is shown.

[0038] Figure 1d A partially enlarged view of a stator according to a first exemplary embodiment of the present invention is shown, in which a plan view of two stator core units stacked on top of each other is shown.

[0039] Figure 2a A stator core unit according to a first exemplary embodiment of the present invention is shown.

[0040] Figure 2b This illustration shows a stator formed by stacking multiple stator core units according to a first exemplary embodiment of the present invention.

[0041] Figures 3a to 3c The first exemplary embodiment of the present invention is shown. Figure 2a The first piece of material and its modification.

[0042] Figures 4a to 4c A second sheet material and its modification according to a second exemplary embodiment of the present invention are shown.

[0043] Figure 5a and Figure 5b A perspective view showing two stator core units stacked on top of each other according to a second exemplary embodiment of the present invention is shown.

[0044] Figure 5c A plan view showing two stator core units stacked on top of each other according to a second exemplary embodiment of the present invention is shown.

[0045] Figures 6a to 6c A modification according to a second exemplary embodiment of the present invention is shown.

[0046] Figure 7 The results of vibration acceleration tests are shown, comparing a motor according to the invention, including an improved stator, with a prior art motor.

[0047] Figure 8 The results of sound pressure tests are shown, comparing a motor according to the invention, including an improved stator, with a prior art motor.

[0048] Reference tag list

[0049] Stator 1; Interference fit part F; Groove S; First notch D1; Second notch D2

[0050] First stator core unit 11; First boss portion 111; First groove S1

[0051] Second stator core unit 12; Second boss portion 122; Second groove S2

[0052] Central axis O; First tooth groove 114; Second tooth groove 124; First sheet material 10

[0053] Second sheet material 20; First flange portion 101; Second flange portion 202

[0054] Span angle α; Spacing angle β; Deflection angle λ Detailed Implementation

[0055] This invention relates to stators for various electromagnetic devices (such as generators, starters, scroll compressors, etc.) and motors including such stators. The following description, using a motor (or generator) configuration as an example, briefly describes the assembly and operation of the motor (or generator) and its stator in devices such as those described above.

[0056] In a conventional configuration of an electric motor, the motor includes a stator and a rotor disposed radially inside the stator around a central axis of the stator. The rotor is capable of rotating relative to the stator about the central axis. The outer peripheral surface of the stator is provided with a protruding interference fit surface for fixed mounting with a fixed structure of the application equipment. The stator is kept firmly fixed by interference fit between the interference fit surface and the surface of the fixed structure. The rotor is connected to a power output component or a power input component of the equipment and is capable of driving the power output component to rotate or being driven to rotate by the power input component.

[0057] Typically, the interference fit surfaces on the outer periphery of the stator are overlapping and aligned protruding surfaces extending along the central axis of the stator. As mentioned earlier, the stator core of a conventional stator is formed by stacking silicon steel sheets with a thickness of 0.35 to 0.5 mm coated with insulating varnish. During motor operation, the high-speed rotation of the rotor generates significant vibration and noise. This vibration propagates radially outward from the central axis of the stator. Because the stator core has the same vibration frequency throughout the radial direction, the damping along the radial direction of the silicon steel sheets is relatively small. Therefore, a large number of vibration waves propagate radially outward from the stator core, forming noise. This vibration not only generates noise but may also affect the stability of the motor and the applied equipment. Therefore, further improvements to the stator are needed to reduce vibration and noise.

[0058] To address the aforementioned technical problems, the present invention improves the structure of the stator.

[0059] The following will be combined with the appendix Figure 1a-8 Preferred embodiments of the present invention will be described in detail below. The following description is exemplary in nature and is not intended to limit the invention or its application or use.

[0060] Figure 1a Stator 1 is shown according to a first exemplary embodiment of the present invention; Figure 1b and Figure 1c A partially enlarged view of a stator according to a first exemplary embodiment of the present invention is shown, wherein a perspective view of two stator core units stacked on top of each other is shown; Figure 1d A partially enlarged view of a stator according to a first exemplary embodiment of the present invention is shown, illustrating a plan view of two stator core units stacked on top of each other. Figures 1a to 1dAs shown, the stator 1 is generally cylindrical and is composed of multiple first stator core units 11 and multiple second stator core units 12 stacked together. The stator 1 has multiple stator slots extending through the stator 1 along the direction of the central axis O. Each stator slot is formed by aligning the first slots 114 of the multiple first stator core units 11 and the second slots 124 of the multiple second stator core units 12 with each other. The outer peripheral surface of the first stator core unit 11 includes two first protrusions 111 that are generally symmetrical at 180°, and the outer peripheral surface of the second stator core unit 12 includes two second protrusions 122 that are generally symmetrical at 180°. In this embodiment, a plurality of first stator core units 11 and a plurality of second stator core units 12 are arranged alternately, and are arranged such that the first protrusions 111 of all the first stator core units 11 are aligned and overlapped with each other along the direction of the central axis O, and the second protrusions 122 of all the second stator core units 12 are aligned and overlapped with each other along the direction of the central axis O. The first protrusions 111 of the first stator core unit 11 and the second protrusions 122 of the adjacent second stator core unit 12 are spaced apart from each other by a certain distance when viewed along the central axis O of the stator 1. That is, the first stator core units 11 and the second stator core units 12 are stacked together with different orientations. By stacking them in this way, four interference mounting portions F are formed on the outer peripheral surface of the stator 1. Each interference mounting portion F is composed of a plurality of first boss portions 111 or a plurality of second boss portions 122 that are spaced apart from each other and overlapped and aligned along the direction of the central axis O.

[0061] The term "orientation" refers to the orientation of the boss portion of the stator core unit. Specifically, the direction of the line connecting the midpoint of the arc length of the first boss portion 111 extending along the circumferential direction of the first stator core unit 11 and the central axis O is the first orientation of the first boss portion 111, and the direction of the line connecting the midpoint of the arc length of the second boss portion 122 extending along the circumferential direction of the second stator core unit 12 and the central axis O is the second orientation of the second boss portion 122.

[0062] For adjacent first stator core units 11 and second stator core units 12, the first orientation of the first boss portion 111 and the second orientation of the second boss portion 122 are deflected relative to each other in the circumferential direction by a deflection angle λ (e.g., ...). Figure 1d As shown in the figure, at the same time, ensure that the plurality of first slots 114 of the first stator core unit 11 and the plurality of second slots 124 of the second stator core unit 12 are aligned one by one along the direction of the central axis O, so that the stator winding (not shown) is wound in the stator slots formed by the first slots 114 and the second slots 124. That is, the deflection angle λ should satisfy the following formula:

[0063] λ=(360° / s)×m

[0064] Where s represents the number of tooth grooves, and m represents an integer greater than 1 and less than s. The meaning of this formula is that the deflection angle λ should be an integer multiple of m times the angle obtained by dividing the 360° inner circumference by the number of tooth grooves s. For example, in this embodiment, the number of first tooth grooves 114 (second tooth grooves 124) is s = 9, λ = (360° / 9) × m = 40m, that is, λ can be equal to 40°, 80°, 120°...320°. Preferably, in this embodiment, since the first stator core unit 11 has two first bosses 111, and the second stator core unit 12 has two second bosses 122, and the two first bosses 111 are approximately symmetrically distributed at 180°, and the two second bosses 122 are approximately symmetrically distributed at 180°, λ is set to 80° (within the angle range of around 90°), that is, as... Figure 1d As shown, the second orientation of the second boss portion 122 is deflected by 80° in the circumferential direction relative to the first orientation of the first boss portion 111. This is beneficial for the two first boss portions 111 and the two second boss portions 122 to be evenly distributed in the circumferential direction, thereby facilitating the provision of uniform and stable support for the stator by each boss portion when the stator is fixed to the fixed structure of the equipment.

[0065] In addition, such as Figure 1a As shown, a groove S is provided on the outer peripheral surface between every two interference fit parts F of the stator 1, and the four grooves S extend along the direction of the central axis O of the stator 1 throughout the entire stacking height of the stator 1. Providing these grooves S facilitates ventilation and heat dissipation. The number of grooves S can be arbitrary, and they can also be provided on the interference fit parts F, as long as the stability of the interference fit is not affected.

[0066] In this embodiment, preferably, the first stator core unit 11 and the second stator core unit 12 have exactly the same shape and size. Figure 2a A first stator core unit according to a first exemplary embodiment of the present invention is shown to be formed by stacking a plurality of first sheet members 10. Reference will be made below. Figure 2a and Figure 2b The first stator core unit 11 and the second stator core unit 12 according to the first embodiment of the present invention will be described in detail.

[0067] like Figure 2aAs shown, the outer periphery of the first sheet material 10 has two first flange portions 101 symmetrically distributed at approximately 180° intervals β. Each first flange portion 101 has an arc-shaped outer edge. Four first notches D1 are provided on the outer periphery between the two first flange portions 101. The inner periphery of the first sheet material 10 has the same number of grooves as the first stator core unit 11's first tooth grooves 114. When multiple first sheet materials 10 are stacked to form a first stator core unit 11, the first flange portions 101 of the multiple first sheet materials 10 overlap and align with each other (e.g., ...). Figure 2a As shown in the diagram, i.e., without deviation from each other along the outer periphery, the first boss portion 111 of the first stator core unit 11 is formed as described above, and the first boss portion 111 has an arc-shaped top surface. Furthermore, the four first notches D1 of the plurality of first sheet members 10 are aligned with each other to form four first grooves S1 on the first stator core unit 11. As described above, in this embodiment, the first stator core unit 11 and the second stator core unit 12 have exactly the same shape and size. Therefore, when the first stator core unit 11 and the second stator core unit 12 are stacked together, the first grooves S1 on the first stator core unit 11 and the second grooves S2 on the second stator core unit 12 can be aligned one-to-one to form grooves S on the stator 1, as shown in the diagram. Figure 2b As shown in the image.

[0068] As previously mentioned, stator core units are typically formed by stacking 0.35 to 0.5 mm thick silicon steel sheets coated with insulating varnish. The first and second sheets in this invention can also be made of such silicon steel sheets or any other suitable material. According to this invention, for different application requirements, 1 to 100 sheets can be stacked to form a stator core unit. More preferably, in this embodiment, 5 to 10 sheets are stacked to form a stator core unit.

[0069] On the other hand, the reference shows Figure 2a The first piece of material 10 Figure 3a As can be seen, in this embodiment, the span angle α formed by the first arc length L1 extending along the outer periphery of the first sheet material 10 about the central axis O is about 30°. Therefore, the span angle α of the first boss portion 111 of the first stator core unit 11 obtained by stacking multiple first sheet materials 10 is also 30°. Furthermore, as mentioned above, in this embodiment, the deflection angle λ of the second orientation of the second boss portion 122 relative to the first orientation of the first boss portion 111 in the circumferential direction is about 80°, that is, λ≥α. Therefore, as shown in the figure, the first boss portion 111 of the first stator core unit 11 and the second boss portion 122 of the adjacent second stator core unit 12 are completely spaced apart in the circumferential direction without any overlap.

[0070] However, the present invention is not limited thereto. According to the present invention, the span angle α corresponding to the arc length extending along the outer periphery of the flange portion can be any angle within the range of 10° to 150°. That is, as described above, the span angle α corresponding to the arc length extending along the circumferential direction of the boss portion on the stator core unit formed by stacking multiple sheets can also be any angle within the range of 10° to 150°. For example, when the deflection angle λ of the boss portions of two adjacent stator core units deviating from each other along the circumferential direction is less than α, the boss portions of the two adjacent stator core units are not completely separated along the circumferential direction, that is, they are only partially deviated from each other. This configuration will also cause a difference in mass distribution and thus a difference in vibration frequency between the two adjacent stator core units, thereby increasing radial damping.

[0071] Furthermore, as shown in the figure, the two flange portions of the first sheet 10 are symmetrically distributed at 180°, therefore the first boss portion 111 of the first stator core unit 11, which is composed of a plurality of first flange portions 101, is also symmetrically distributed at 180°. However, the present invention is not limited thereto. Depending on the actual application requirements, the number of flange portions (bosses of the stator core unit) of the sheet can be more than two, and they can be spaced apart from each other by other interval angles β.

[0072] for example Figure 4a The second sheet material 20 shown according to a second exemplary embodiment of the present invention includes three second flange portions 202, which are spaced apart from each other at a 120° interval angle β. The span angle α corresponding to the second arc length L2 extending along the outer periphery of the second flange portion 202 is approximately 45°. Therefore, the span angle α of the second boss portion 122 of the second stator core unit 12 obtained by stacking multiple second sheet materials 20 is also 45°, and each second boss portion 122 is spaced apart from each other at a 120° interval angle β. In the embodiment including three flange portions (bosses), preferably, the span angle α of the flange portions (bosses) can be any angle in the range of 10° to 110°.

[0073] Figure 5a and Figure 5b A perspective view showing two stator core units stacked on top of each other according to a second exemplary embodiment of the present invention is shown. Figure 5cA plan view of two stator core units stacked on top of each other according to a second exemplary embodiment of the present invention is shown. In the second embodiment, the stator is also formed by stacking a plurality of first stator core units and a plurality of second stator core units on top of each other. As shown in the figure, the first stator core unit 11 and the second stator core unit 12 have exactly the same shape and size, that is, the first stator core unit 11 includes three first boss portions 111, the three first boss portions 111 are spaced apart from each other at a spacing angle β of 120° and each has a span angle α of approximately 45°. Similar to the first embodiment, the first orientation of the first boss portion 111 and the second orientation of the second boss portion 122 are deflected relative to each other in the circumferential direction by a deflection angle λ, λ being approximately equal to 40° (e.g., ...). Figure 5c As shown in the figure, the plurality of first tooth slots 114 of the first stator core unit 11 and the plurality of second tooth slots 124 of the second stator core unit 12 are aligned one-to-one along the direction of the central axis O. Since λ < α, as shown in the figure, the first boss portion 111 of the first stator core unit 11 and the second boss portion 122 of the adjacent second stator core unit 12 are not completely spaced apart along the circumferential direction and therefore have overlapping portions (e.g., Figure 5b (As shown).

[0074] In the two embodiments described above, the first stator core unit 11 and the second stator core unit 12 have exactly the same shape and size. However, the present invention is not limited thereto. For example, a second stator core unit 12 (according to the second embodiment) formed by stacking multiple second sheet members 20 and having three second bosses 122 spaced 120° apart can be stacked with a first stator core unit 11 (according to the first embodiment) including two first bosses 111 symmetrically distributed at 180°. Adjacent first stator core units 11 and second stator core units 12 can be stacked such that one of the first bosses 111 and one of the second bosses 122 are partially offset from each other and not completely spaced apart (partially overlapping), while the remaining first boss 111 and the remaining two second bosses 122 are spaced apart from each other but by different deflection angles λ.

[0075] Although the above embodiments exemplarily describe sheet members including two or three flange portions and stator core units including two or three boss portions, the present invention is not limited thereto. Sheet members including any other number of flange portions and stator core units including any other number of boss portions can be arranged in a similar manner as needed.

[0076] Furthermore, according to the present invention, preferably, the spacing angle β can be any angle in the range of 40° to 180°, more preferably, the spacing angle β can be any angle in the range of 40° to 130°, so as to better improve the mass distribution difference between two adjacent stator core units and thus the radial vibration damping.

[0077] In addition, refer to Figures 3a to 3c It shows Figure 2a The first piece of material ( Figure 3a ) and its modifications ( Figure 3b and Figure 3c ), and refer to Figures 4a to 4c The second sheet material according to the second embodiment of the present invention is shown. Figure 4a ) and its modifications ( Figure 4b and Figure 4c ).like Figure 3a As shown, the first notch D1 of the first sheet material 10 is only provided between the two first flange portions 101. Figure 3b and Figure 3c In the variation shown, the first notch D1 of the first sheet 10 is provided at the first flange 101 and between the two first flanges 101. Depending on actual needs, different numbers and sizes of first notches D1 can be provided at the first flange 101 and between the two first flanges 101, and are not limited to the specific configuration shown in the figure. Similarly, as... Figure 4a As shown, the second notch D2 of the second sheet material 20 is disposed between the two second flange portions 202. Figure 4b and Figure 4c In the variant shown, the second notch D2 of the second sheet 20 is provided at the second flange 202 and between the two second flanges 202. Similarly, depending on actual needs, different numbers and sizes of second notches D2 can be provided at the second flange 202 and between the two second flanges 202, and are not limited to the specific configuration shown in the figure. Furthermore, the first notch D1 and the second notch D2 can differ in number, shape, and size. Multiple first sheets 10 are stacked such that each first notch D1 is aligned with each other to form a first groove S1 of the first stator core unit 11, and multiple second sheets 20 are stacked such that each second notch D2 is aligned with each other to form a second groove S2 of the second stator core unit 12. Alternatively, the first notches D1 and the second notches D2 can also be selectively not aligned one by one.

[0078] By providing the aforementioned notches on the flange portion of the sheet material, airflow can be facilitated within the notches, thereby achieving ventilation and heat dissipation. On the other hand, the notches on the flange portion can also divide the flange portion, dividing each flange portion into multiple flange parts. Therefore, the stator core unit obtained by stacking multiple such sheet materials as described above will also have multiple grooves (located at the boss portion and / or between two adjacent boss portions). Similarly, in addition to improving the ventilation and heat dissipation performance of the stator core unit, the grooves located on the boss portion also serve to divide the boss portion, thereby increasing the mass distribution difference at the periphery of the stator core unit and further improving the radial damping of the stator core unit.

[0079] For example, Figures 6a to 6c A second exemplary embodiment according to the present invention is shown. Figures 5a to 5c The modification of ), wherein the first stator core unit 11 and the second stator core unit 12 are respectively composed of Figure 4c The modified second sheet 20 shown is stacked and has the same size and shape. The first boss portion 111 of the first stator core unit 11 has two first grooves S1 and there is a first groove S1 between two adjacent first boss portions 111. Similarly, the second boss portion 122 of the second stator core unit 12 has two second grooves S2 and there is a second groove S2 between two adjacent second boss portions 122. Thus, the first grooves S1 and the second grooves S2 not only improve the ventilation and heat dissipation performance of the stator core unit, but also, the first grooves S1 and the second grooves S2 provided on the first boss portion 111 and the second boss portion 122 further divide the first boss portion 111 and the second boss portion 122 into three boss portions respectively, thereby further increasing the mass distribution difference at the periphery of the stator core unit and thus further reducing vibration and noise.

[0080] In particular, for different implementations, the number of notches on the flange can be in the range of 0 to 110, so as to improve heat dissipation while ensuring the interference fit strength between the flange (boss) and the outer housing.

[0081] Figure 7 Vibration acceleration test results are shown, comparing a motor according to the present invention, including an improved stator, with a prior art motor. A 63Fr BPM motor operating at 7200 rpm was used as an example for testing during compressor operation. Specifically, the horizontal axis in the figure represents the vibration frequencies (Hz) caused by different rotor rotation speeds, and the vertical axis represents the motor amplitude. As can be seen from the figure, the amplitude of the motor including the improved stator is significantly smaller than that of the prior art motor under all speed conditions. Clearly, the improved stator according to the present invention significantly suppresses radial vibration propagation, thereby greatly reducing the motor amplitude.

[0082] Figure 8 The results of sound pressure level (SPL) tests comparing a motor according to the present invention, including an improved stator, with a prior art motor are shown. A 63Fr BPM motor operating at 7200 rpm was used as an example for testing during compressor operation. Specifically, the horizontal axis in the figure represents the vibration frequencies (Hz) caused by different rotor rotation speeds, and the vertical axis represents the sound pressure level of the motor noise. As can be seen from the figure, the sound pressure level of the motor including the improved stator is significantly lower than that of the prior art motor under all speed conditions. Clearly, the improved stator according to the present invention significantly suppresses radial vibration propagation, thereby significantly reducing motor noise.

[0083] Furthermore, it should be noted that, although not necessarily the most preferred embodiment, under certain specific requirements, the multiple sheet members constituting a stator core unit may also have different sizes and shapes, as long as the flange portions on each sheet member can be at least partially stacked together to form at least two spaced boss portions. That is to say, the boss portions of the same stator core unit may therefore have different sizes and shapes, different spacing angles β, and thus have different sizes and shapes from other stator core units. On the other hand, even if the first and second sheet pieces have exactly the same size and shape, the first and second stator core units obtained by stacking as described above do not necessarily have exactly the same size and shape. For example, the multiple sheet pieces constituting a stator core unit do not necessarily stack with their flanges perfectly aligned. Instead, the orientations of the flanges of the multiple sheet pieces can be different from each other, thus partially offsetting each other. The number of bosses in the stator core unit formed in this way is still the same as the number of flanges of each sheet piece. Alternatively, the orientations of the flanges of the multiple sheet pieces can be different from each other, thus spacing them apart. The number of bosses in the stator core unit formed in this way can be different from the number of flanges of each sheet piece. Those skilled in the art can make many modifications by reading the above description, as long as it can be ensured that the entire stator core formed by stacking multiple stator core units with similar configurations can be firmly supported by the interference fit between each boss and the housing.

[0084] On the other hand, although the embodiments described above only define the first stator core unit and the second stator core unit, and all the first stator core units are aligned with each other in a consistent first orientation, and all the second stator core units are aligned with each other in a consistent second orientation, the present invention is not limited to this. For example, it may additionally include multiple third stator core units. Similarly, the third stator core unit may include at least two spaced-apart third bosses. The third bosses may also be interference-fitted with the fixing structure of the device. Furthermore, the third bosses may have similar features and combinations thereof, such as the span angle α, the spacing angle β, and the third orientation, as described above. The third stator core units are alternately arranged with the first stator core units and the second stator core units along the central axis such that the third orientation of the third bosses is at least partially offset from the first orientation of the first bosses and the second orientation of the second bosses along the circumferential direction by an offset angle λ. The multiple third tooth slots on the third stator core unit are aligned one-to-one with the multiple first tooth slots and the multiple second tooth slots. Based on the foregoing embodiments, the multiple third stator core units may be aligned with each other in a completely overlapping manner with a third orientation. This obviously further enhances the differences in mass distribution throughout the stator core and, consequently, the differences in vibration frequency distribution.

[0085] Finally, as the most preferred option, the alternating arrangement of the third stator core unit with the first and second stator core units along the central axis can be stacked in a unique order. This unique order could be, for example, the following sequence: first stator core unit, second stator core unit, third stator core unit, first stator core unit, second stator core unit, third stator core unit… (repeatedly stacked in sequence). This not only improves structural stability but also further enhances the uniformity of mass distribution throughout the stator core, thereby uniformly reducing vibration and noise throughout the stator core. Of course, any other suitable order can also be used for stacking.

[0086] By reading the above content, those skilled in the art should be able to conceive of other similar modifications.

[0087] Furthermore, although the configuration of the motor (generator) with the stator located circumferentially outward and the rotor located circumferentially inward of the stator described above, the configuration of the stator and rotor is not limited to the above situation. Instead, they can also be arranged as follows: the stator is fixed and remains stationary, the rotor is located radially outward of the stator and can rotate relative to the stator about the central axis, and the rotor is connected to the power output or input shaft of the device to perform electrical energy conversion or transmission. In this case, the circumferentially outer surface of the stator is opposite to the rotor and includes toothed grooves for winding the coils, while the inner surface of the stator is fixedly mounted to the mounting surface. For this mounting configuration, in order to increase the radial damping of the stator to reduce vibration and noise, a first stator... The sub-core unit and the second stator core unit are provided with the aforementioned boss portion on their circumferential inner surfaces. The boss portion protrudes from the circumferential inner surfaces toward the central axis for interference fit with the mating mounting surface. In this configuration, the aforementioned characteristics and combinations of the flange portion about the central axis, such as the span angle α, the interval angle β, and the deflection angle λ, are still applicable to this boss portion provided on the circumferential inner surfaces. By at least partially offset between the first boss portion provided on the circumferential inner surfaces of the first stator core unit and the second boss portion provided on the circumferential inner surfaces of the second stator core unit, the mass distribution difference between the first stator core unit and the second stator core unit can also be achieved, thereby improving radial damping to reduce vibration and noise.

[0088] Although exemplary embodiments of the stator and motor including the stator according to the present invention have been described in the foregoing embodiments, the present invention is not limited thereto, and various other modifications, substitutions and combinations can be made without departing from the scope of protection of the present invention.

[0089] It is evident that by combining or modifying different implementation methods and various technical features in different ways, various different implementation methods can be designed.

[0090] The foregoing description, in conjunction with specific embodiments, describes a stator and an electric motor including the stator according to a preferred embodiment of the present invention. It is understood that the above description is merely exemplary and not restrictive, and various modifications and variations can be conceived by those skilled in the art with reference to the above description without departing from the scope of the invention. These modifications and variations are also included within the scope of protection of the present invention.

Claims

1. A stator (1) for an electromagnetic device, the stator being interference-fitted to a fixed structure, the stator comprising: The first stator core unit (11) includes at least two first bosses (111) that are interference-fitted with the fixing structure; The second stator core unit (12) includes at least two second bosses (122) that are interference-fitted with the fixing structure. The first stator core unit and the second stator core unit are stacked along the direction of the central axis (O) of the stator such that adjacent first and second boss portions are partially offset from each other when viewed along the direction of the central axis. The stator includes a plurality of first stator core units and a plurality of second stator core units, which are arranged alternately along the direction of the central axis. The first boss portions of the plurality of first stator core units are aligned with each other along the direction of the central axis, and the second boss portions of the plurality of second stator core units are aligned with each other along the direction of the central axis. For adjacent first stator core units (11) and second stator core units (12), the deflection angle λ of the first orientation of the first boss portion (111) and the second orientation of the second boss portion (122) relative to each other in the circumferential direction is less than the span angle α corresponding to the arc length of each of the first and second boss portions extending in the circumferential direction of the corresponding stator core unit.

2. The stator according to claim 1, wherein, At least two of the first boss portions have the same size and shape, and at least two of the second boss portions have the same size and shape.

3. The stator according to claim 1, wherein, At least two of the first bosses are spaced apart by an equal distance, and at least two of the second bosses are spaced apart by an equal distance.

4. The stator according to claim 1, wherein, The first boss portion and the second boss portion have an arc shape to be interference-fitted with the cylindrical surface of the fixed structure.

5. The stator according to claim 1, wherein, The first stator core unit is provided with a first groove (S1), the first groove being disposed on the first boss portion and / or between adjacent first boss portions, and / or, The second stator core unit is provided with a second groove (S2), which is provided on the second boss portion and / or between adjacent second boss portions.

6. The stator according to claim 5, wherein, The first grooves (S1) of a plurality of first stator core units are aligned along the direction of the central axis, and / or the second grooves (S2) of a plurality of second stator core units are aligned along the direction of the central axis.

7. The stator according to claim 1, wherein, The first stator core unit is formed by stacking at least two first sheet materials (10) along the direction of the central axis, and the second stator core unit is formed by stacking at least two second sheet materials (20) along the direction of the central axis.

8. The stator according to claim 7, wherein, The first stator core unit is composed of 5 to 10 first sheet materials (10) stacked together, and the second stator core unit is composed of 5 to 10 second sheet materials (20) stacked together.

9. The stator according to any one of claims 1 to 8, wherein, The first stator core unit and the second stator core unit have the same structure.

10. The stator according to any one of claims 1 to 8, wherein, The first stator core unit and the second stator core unit have different structures.

11. The stator according to any one of claims 1 to 8, wherein, The stator further includes a third stator core unit, which includes at least two third bosses that are interference-fitted with the fixing structure. The third stator core unit is stacked with the first stator core unit and the second stator core unit along the direction of the central axis such that the third bosses are at least partially offset from the first bosses and the second bosses when viewed along the direction of the central axis.

12. An electric motor, characterized in that, The motor includes: The stator according to any one of claims 1-11; and A rotor disposed on the radial inner or outer side of the stator, the rotor being capable of rotating relative to the stator about the central axis of the stator.

13. A compressor, characterized in that, The compressor includes: The stator according to any one of claims 1-11; and A rotor disposed on the radial inner or outer side of the stator, the rotor being capable of rotating relative to the stator about the central axis of the stator.

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