Stator assembly and axial electromagnetic bearing with same

Abstract

The stator assembly comprises an auxiliary part, a magnetic conductive sheet and a coil, the projection of the auxiliary part in the thickness direction of the auxiliary part is annular, an insulating layer is arranged on the surface of the magnetic conductive sheet, the extension direction of the magnetic conductive sheet is consistent with the thickness direction of the auxiliary part, and the coil is arranged on the surface of the magnetic conductive sheet. The magnetic conductive sheets are arranged on the auxiliary part, the first ends of the magnetic conductive sheets are detachably connected with the auxiliary part, openings are formed in the second ends of the magnetic conductive sheets, the magnetic conductive sheets are sequentially arranged in the circumferential direction of the center line of the auxiliary part, a winding area is defined by the openings, and the magnetic conductive sheets are wound around the winding area. And the coil is wound on the magnetic conductive sheet and is arranged in the winding area. The stator assembly has the advantages of high use precision and high reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic bearings, and in particular relates to a stator assembly and an axial electromagnetic bearing having the same. Background Art

[0002] As a core support component for high-speed rotating machinery, electromagnetic bearings (EMBs), with their contactless, wear-free, and high-precision properties, have important applications in aerospace, high-speed turbomachinery, and new energy equipment. Axial electromagnetic bearings (THBs) provide axial support for the rotor. Due to their functionality and installation characteristics, traditional axial electromagnetic bearings typically utilize a solid, integral stator core. Electromagnetic coils generate a controllable magnetic field to achieve stable rotor suspension.

[0003] In related technologies, solid iron cores in alternating magnetic fields generate strong eddy current effects due to changes in magnetic flux. According to the principle of electromagnetic induction, the higher the conductivity of the core material and the faster the frequency of magnetic field changes, the more significant the eddy current losses. Under high-frequency electromagnetic excitation, iron losses (core losses) often account for more than 70% of the total system losses, leading to a sharp increase in stator temperature rise. This temperature rise not only accelerates the aging of the insulation material but can also cause magnetic saturation and thermal deformation, directly affecting the bearing stiffness and stability. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, embodiments of the present invention provide a stator assembly and an axial electromagnetic bearing having the same. The stator assembly has the advantages of high operating precision and high reliability.

[0006] A stator assembly according to an embodiment of the present invention comprises:

[0007] an auxiliary member, wherein the projection of the auxiliary member in the thickness direction thereof is annular;

[0008] A magnetic conductive sheet, wherein an insulating layer is provided on the surface of the magnetic conductive sheet, an extension direction of the magnetic conductive sheet is consistent with a thickness direction of the auxiliary member, and a first end of the magnetic conductive sheet is detachably connected to the auxiliary member, and a second end of the magnetic conductive sheet has an opening, and the plurality of magnetic conductive sheets are sequentially arranged along the circumference of the center line of the auxiliary member, and the plurality of openings define a winding area;

[0009] The coil is wound on the magnetic conductive sheet and placed in the winding area.

[0010] The stator assembly of this embodiment utilizes multiple stacked magnetically conductive sheets with insulating layers, effectively blocking the path of eddy currents and reducing the eddy currents generated within the sheets due to magnetic flux fluctuations. Under high-frequency electromagnetic excitation, this significantly reduces temperature rise and dynamic hysteresis, avoiding issues such as insulation material aging, magnetic saturation, and thermal deformation caused by excessive temperature rise. This ensures the overall stiffness and stability of the stator assembly, extending its service life.

[0011] In some embodiments, the magnetic conductive sheet includes an extension portion, the extension portion extends in a direction away from the auxiliary component, and the opening passes through the extension portion along a thickness direction of the magnetic conductive sheet.

[0012] In some embodiments, there are multiple extension portions, and the multiple extension portions are arranged at intervals along the width direction of the magnetic conductive sheet, and the opening is defined between two adjacent extension portions.

[0013] In some embodiments, the auxiliary component includes a connecting component and multiple auxiliary sub-components, and the multiple auxiliary sub-components are detachably connected in sequence through the connecting component. The auxiliary sub-component is provided with an auxiliary groove on one side adjacent to the magnetic conductive sheet, and the first end of the magnetic conductive sheet is adapted to the auxiliary groove.

[0014] In some embodiments, within the plane where the center line of the auxiliary member is located, the cross-sectional profile of the auxiliary groove is T-shaped.

[0015] In some embodiments, there are multiple connecting members, and two adjacent auxiliary sub-members are connected by at least one connecting member.

[0016] In some embodiments, a side of the auxiliary part away from the magnetic conductive sheet is provided with an avoidance groove, and the avoidance groove is located on the side of the auxiliary part away from the center line of the auxiliary part, and at least a portion of the connecting part is placed in the avoidance groove.

[0017] In some embodiments, the stator assembly of the embodiment of the present invention further includes a filling piece, and the filling piece is used to fill the gap between two adjacent magnetic conductive sheets.

[0018] In some embodiments, the filler has a molten state and a solidified state. In the molten state, the filler is used to flow into the gap between two adjacent magnetic conductive sheets.

[0019] In the solidified state, the filler is used to strengthen the connection strength between the plurality of magnetic conductive sheets.

[0020] An axial electromagnetic bearing according to an embodiment of the present invention includes a bearing body and a stator. The stator is connected to the bearing body, and the stator is a stator assembly according to any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional cross-sectional schematic diagram of a stator assembly according to an embodiment of the present invention.

[0022] Figure 2 4 is a top view of a stator assembly according to an embodiment of the present invention.

[0023] Figure 3 yes Figure 2 The cross-sectional diagram along the AA direction is shown in FIG.

[0024] Figure 4 Schematic diagram of the cross-sectional profile of the auxiliary component of the stator assembly according to an embodiment of the present invention.

[0025] Figure 5 It is a schematic structural diagram of the magnetic conductive sheet of the stator assembly of an optional embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. Auxiliary parts, 11. Auxiliary sub-parts, 111. Auxiliary slots, 112. Avoidance slots,

[0028] 2. Magnetic conductive sheet, 21. Opening, 22. Extension,

[0029] 3. Coil. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0031] like Figure 1-Figure 5 As shown, the stator assembly of the embodiment of the present invention includes: an auxiliary part, a magnetic conductive sheet and a coil.

[0032] The auxiliary part is in its thickness direction (such as Figure 2 The projection in the vertical direction (in the vertical direction) is annular. An insulating layer is provided on the surface of the magnetic conductive sheet. The extension direction of the magnetic conductive sheet is consistent with the thickness direction of the auxiliary member. The first end of the magnetic conductive sheet is detachably connected to the auxiliary member. The second end of the magnetic conductive sheet has an opening. There are multiple magnetic conductive sheets, which are arranged in sequence along the circumference of the centerline of the auxiliary member. The multiple openings define a winding area. The coil is wound around the magnetic conductive sheet and placed in the winding area.

[0033] Specifically, if Figure 1-Figure 3As shown, the auxiliary component is an annular component that provides a mounting location for the magnetic conductive sheet. The upper end of the magnetic conductive sheet can be connected to the auxiliary component through a form-locking fit (such as a dovetail groove, wedge key, T-slot, etc.) to facilitate operation during installation, maintenance, or replacement of the magnetic conductive sheet. Multiple magnetic conductive sheets are arranged in a circumferential direction along the centerline of the auxiliary component. The auxiliary component supports and positions the multiple magnetic conductive sheets, allowing them to be arranged in a specific layout and collectively form part of the stator assembly.

[0034] The second end of the magnetic conductive sheet has an opening. Because multiple magnetic conductive sheets are arranged circumferentially along the centerline of the auxiliary component (forming a laminated structure), the multiple openings collectively define a winding area circumferentially along the centerline of the auxiliary component. The coil is wound around the magnetic conductive sheet and placed within the winding area. The magnetic conductive sheet provides a basic structure for the coil to wind, and the definition of the winding area ensures that the coil can be wound around the magnetic conductive sheet in an orderly manner, forming an effective electromagnetic induction structure.

[0035] The removable connection between the magnetic plate and the auxiliary component allows for easy removal and individual handling of the magnetic plate if it becomes damaged or requires performance upgrades, eliminating the need for extensive disassembly and replacement of the entire stator assembly. This significantly reduces maintenance costs and time. The auxiliary component supports and positions the multiple magnetic plates, ensuring their precise and stable arrangement. During operation of the axial electromagnetic bearing, the stable arrangement of the magnetic plates helps generate a uniform and stable magnetic field, thereby improving the stability and precision of the rotor suspension.

[0036] It should be noted that the magnetic sheet is made of a magnetically conductive material such as silicon steel sheet, and its surface needs to be evenly coated with an insulating layer (such as an inorganic insulating layer (aluminum oxide, ceramic coating, etc.), an organic insulating layer (epoxy resin, silicone resin, etc.), or a composite insulating material (epoxy resin and aluminum oxide composite coating, etc.). Auxiliary components can be made of a structurally strong, non-magnetic material such as stainless steel.

[0037] In other words, the stator assembly of this embodiment of the present invention utilizes multiple stacked magnetically conductive sheets with insulating layers, effectively blocking the path of eddy currents and reducing the eddy currents generated within the sheets due to magnetic flux fluctuations. Under high-frequency electromagnetic excitation, this significantly reduces temperature rise and dynamic hysteresis, avoiding issues such as insulation material aging, magnetic saturation, and thermal deformation caused by excessive temperature rise. This ensures the overall stiffness and stability of the stator assembly, extending its service life.

[0038] In some embodiments, the magnetic conductive sheet includes an extension portion, the extension portion extends in a direction away from the auxiliary component, and the opening passes through the extension portion along the thickness direction of the magnetic conductive sheet.

[0039] It is understandable that if Figure 1 and Figure 2 As shown, the extension is located below the magnetic conductive sheet, and the opening is positioned to provide installation space for subsequent coils. Therefore, the opening can be positioned differently based on actual operating conditions, so that the winding area formed by the stacked multiple magnetic conductive sheets meets the needs of different scenarios. Preferably, the opening is located at the bottom of the extension, forming an open space downward at the bottom of the magnetic conductive sheet, allowing the coil to be easily wound from below the magnetic conductive sheet.

[0040] In other words, the structure of the extension and opening allows the coil to be more stably fixed to the magnetic conductive sheet after winding. In addition, the extension can play a certain restraining role on the coil, preventing the coil from shifting or loosening during operation, thus ensuring the stability of the electromagnetic system.

[0041] Optionally, there are multiple extension parts, and the multiple extension parts are arranged at intervals along the width direction of the magnetic conductive sheet, and an opening is defined between two adjacent extension parts.

[0042] It is understandable that if Figure 5 As shown, multiple extensions are arranged at intervals along the left-right direction, and the interval area between every two adjacent extensions is an opening. It should be noted that different numbers of extensions are provided at the bottom of the magnetic conductive sheet, so that the position and number of openings on a single magnetic conductive sheet vary accordingly, so that it can be adapted to different usage scenarios. At the same time, multiple paths and different operating spaces are provided for the winding of the coil. When winding, the operator can more conveniently wind the coil along the extension, and since the opening is in an open state, the coil can pass through the opening more smoothly, reducing obstacles and difficulties in the winding process and improving production efficiency.

[0043] In other words, providing multiple openings at the bottom of the magnetically conductive sheet effectively divides the bottom of the sheet into multiple independent sections, further disrupting the complete eddy current flow path, confining the eddy current to a smaller loop within each extension. Compared to a traditional solid iron core, the stator assembly of the present invention embodiment has a reduced eddy current flow area. Given a constant resistivity and length, a reduced cross-sectional area increases resistance. This increased resistance, in turn, reduces eddy currents under the same induced electromotive force, thereby reducing eddy current losses.

[0044] Furthermore, the multiple openings in the structure can reduce eddy current losses, which weakens the strength of the reverse magnetic field generated by eddy currents. In electromagnetic systems, the reverse magnetic field hinders the change of the original magnetic field, affecting the rapid establishment and adjustment of the electromagnetic force. The weakening of the eddy current reverse magnetic field allows the original magnetic field to change more quickly in response to control signals, thereby enabling the electromagnetic force to respond promptly to changes in rotor position, improving the dynamic response performance of the corresponding bearing.

[0045] In some embodiments, the auxiliary component includes a connecting component and multiple auxiliary sub-components, and the multiple auxiliary sub-components are detachably connected in sequence through the connecting component. An auxiliary groove is provided on one side of the auxiliary sub-component adjacent to the magnetic conductive sheet, and the first end of the magnetic conductive sheet is adapted to the auxiliary groove.

[0046] It is understandable that a plurality of auxiliary sub-components can be sequentially spliced ​​into a ring-shaped auxiliary component, that is, each auxiliary sub-component is an arc-shaped component. Figure 3 As shown, there are two auxiliary sub-components, both of which are semicircular, so as to facilitate the use of connectors for fixed connection. Among them, the connector and the auxiliary sub-components can be connected by split-type clamping rings, flange bolt connections, clamp connections, etc.

[0047] like Figure 1 、 Figure 3 and Figure 4 As shown, the lower surface of the auxiliary sub-assembly defines an auxiliary groove, and the upper end of the magnetic conductive sheet is adapted to fit within the contour of the auxiliary groove, allowing the magnetic conductive sheet to be connected to the auxiliary sub-assembly through a form-locking fit. In other words, after the auxiliary assembly is divided into multiple auxiliary sub-assemblies, multiple magnetic conductive sheets can be mounted on each auxiliary sub-assembly before being securely connected to form a complete stator assembly. This provides flexibility for the stator assembly, allowing the number or combination of auxiliary sub-assemblies to be adjusted to meet varying performance requirements based on different operating conditions and needs, while also enhancing the adaptability of the axial electromagnetic bearing.

[0048] Preferably, in the plane where the center line of the auxiliary part is located, the cross-sectional profile of the auxiliary slot is T-shaped. It is understandable that the auxiliary slot with a T-shaped cross-sectional profile can provide a better limiting effect for the magnetic conductive sheet. During the operation of the axial electromagnetic bearing, the rotation of the rotor may generate forces in various directions. The transverse part of the T-shaped slot can limit the movement of the magnetic conductive sheet in the horizontal direction, while the vertical part ensures the stability of the magnetic conductive sheet in the vertical direction. Compared with slots of ordinary shapes, T-shaped slots can more effectively prevent the magnetic conductive sheet from loosening or displacement during operation, thereby ensuring the structural stability of the entire stator assembly and ensuring the normal operation of the axial electromagnetic bearing.

[0049] Furthermore, the close fit between the T-slot and the magnetic plate allows for a more even distribution of electromagnetic force and other loads between the plate and the auxiliary components. This helps improve the overall load-bearing capacity of the structure, enabling the axial electromagnetic bearing to withstand greater axial and radial forces and adapt to more complex operating environments and higher load requirements.

[0050] In some embodiments, there are multiple connectors, with two adjacent auxiliary sub-components connected by at least one connector. It is understood that the provision of multiple connectors increases the connection strength and rigidity between adjacent auxiliary sub-components. During operation, the axial electromagnetic bearing is subject to various forces, including electromagnetic force and vibration generated by rotor rotation. Multiple connectors can better disperse and transmit these forces, preventing structural deformation or damage caused by excessive local forces, making the overall auxiliary component structure more stable and improving the reliability of the axial electromagnetic bearing under complex operating conditions.

[0051] Each adjacent auxiliary component is connected by at least one connector, effectively limiting relative displacement. Even when subjected to significant external impact, the connector ensures the components maintain a relatively fixed position, ensuring the accurate installation of the magnetic plate and maintaining the stability of the magnetic field distribution, crucial for stable rotor suspension.

[0052] In some embodiments, a side of the auxiliary member away from the magnetic conductive sheet is provided with an avoidance groove, and the avoidance groove is located on the side of the auxiliary member away from the center line of the auxiliary member, and at least a portion of the connecting member is placed in the avoidance groove.

[0053] Specifically, if Figure 1 As shown, the avoidance groove is formed on the upper surface of the auxiliary component and is arranged adjacent to the outer peripheral wall of the auxiliary component. The end of the avoidance groove is provided with a connecting hole for matching the connecting member, so that between two adjacent auxiliary sub-components, one connecting member can be matched in the connecting hole of the two auxiliary sub-components, thereby achieving the function of fixing the two auxiliary sub-components.

[0054] It is understandable that if Figure 1 As shown, the presence of the avoidance groove can provide avoidance space for the connecting part, which not only facilitates the installation of the connecting part, but also prevents the connecting part from protruding toward the outside of the auxiliary part, thereby facilitating the coordination between the auxiliary part and other equipment.

[0055] In some embodiments, the stator assembly of the embodiment of the present invention further includes a filler, which is used to fill the gap between two adjacent magnetic conductive sheets.

[0056] It is understood that after multiple magnetic sheets are installed with the auxiliary component, due to the difference in radius between the inner ring (the side closest to the centerline of the auxiliary component) and the outer ring of the magnetic sheet, when the inner ring of the magnetic sheet is squeezed tightly, there will still be a certain gap in the outer ring. Therefore, fillers can be used to fill this gap to further secure the magnetic sheet and prevent vibration during operation.

[0057] In some embodiments, the filler has a molten state and a solidified state. In the molten state, the filler is used to flow into the gap between two adjacent magnetic conductive sheets. In the solidified state, the filler is used to strengthen the connection strength between multiple magnetic conductive sheets.

[0058] It is understood that the filler can be made of a resin material. That is, after the multiple magnetic conductive sheets are stacked and installed, the filler is heated to a molten state. After filling the gaps between the magnetic conductive sheets, the filler can flow into deeper gaps on its own, ensuring complete filling. After filling is completed, the cooled and solidified filler (i.e., the solidified filler) not only secures the multiple magnetic conductive sheets to form a complete structure, but also remains intact even under significant external forces.

[0059] An axial electromagnetic bearing according to an embodiment of the present invention includes a bearing body and a stator. The stator is connected to the bearing body and is a stator assembly according to any one of the above embodiments.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A stator assembly, characterized in that: include: an auxiliary member, wherein the projection of the auxiliary member in the thickness direction thereof is annular; A magnetic conductive sheet, wherein an insulating layer is provided on the surface of the magnetic conductive sheet, an extension direction of the magnetic conductive sheet is consistent with a thickness direction of the auxiliary member, and a first end of the magnetic conductive sheet is detachably connected to the auxiliary member, and a second end of the magnetic conductive sheet has an opening, and the plurality of magnetic conductive sheets are sequentially arranged along the circumference of the center line of the auxiliary member, and the plurality of openings define a winding area; The coil is wound on the magnetic conductive sheet and placed in the winding area.

2. The stator assembly according to claim 1, characterized in that The magnetic conductive sheet includes an extension portion extending in a direction away from the auxiliary component, and the opening penetrates the extension portion along a thickness direction of the magnetic conductive sheet.

3. The stator assembly according to claim 2, characterized in that There are multiple extension parts, and the multiple extension parts are arranged at intervals along the width direction of the magnetic conductive sheet, and the opening is defined between two adjacent extension parts.

4. The stator assembly according to claim 1, wherein: The auxiliary component includes a connecting component and multiple auxiliary sub-components, and the multiple auxiliary sub-components are detachably connected in sequence through the connecting component. The auxiliary sub-component is provided with an auxiliary groove on one side adjacent to the magnetic conductive sheet, and the first end of the magnetic conductive sheet is adapted to the auxiliary groove.

5. The stator assembly according to claim 4, characterized in that In the plane where the center line of the auxiliary part is located, the cross-sectional profile of the auxiliary groove is T-shaped.

6. The stator assembly according to claim 5, characterized in that There are multiple connecting parts, and two adjacent auxiliary sub-components are connected by at least one connecting part.

7. The stator assembly according to claim 6, characterized in that A side of the auxiliary component away from the magnetic conductive sheet is provided with an avoidance groove, and the avoidance groove is located on the side of the auxiliary component away from the center line of the auxiliary component, and at least a portion of the connecting component is placed in the avoidance groove.

8. The stator assembly according to claim 1, wherein: It also includes a filling piece, which is used to fill the gap between two adjacent magnetic conductive sheets.

9. The stator assembly according to claim 8, characterized in that The filler has a molten state and a solidified state. In the molten state, the filler is used to flow into the gap between two adjacent magnetic conductive sheets. In the solidified state, the filler is used to strengthen the connection strength between the plurality of magnetic conductive sheets.

10. An axial electromagnetic bearing, characterized in that: It comprises a bearing body and a stator, wherein the stator is connected to the bearing body, and the stator is a stator assembly according to any one of claims 1 to 9.

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