A magnetic bearing rotor assembly with eddy current prevention

Abstract

The utility model relates to magnetic suspension bearing high -speed operation technical field, the utility model discloses a kind of eddy current effect prevention type magnetic suspension bearing rotor assemblies, solve the problem that alternating magnetic field can in the rotor core inside induction eddy current forms closed loop, including magnetic layer and first interval layer. The magnetic layer and the first interval layer are annular, the first interval layer is arranged between two adjacent magnetic layer, the first interval layer is magnetic isolation material, the magnetic layer and the first interval layer are used to be connected in sleeve on the rotating shaft, since first interval layer is arranged between adjacent magnetic layer, and first interval layer is magnetic layer, when alternating magnetic field can in the rotor core inside induction eddy current, the existence of first interval layer cuts off eddy current loop, such that eddy current loop is blocked, cannot form closed loop eddy current loop, solve the problem that alternating magnetic field can in the rotor core inside induction eddy current forms closed loop.

Description

Technical Field

[0001] This utility model relates to the field of high-speed operation technology of magnetic levitation bearings, and in particular to a rotor assembly of a magnetic levitation bearing with anti-eddy current effect. Background Technology

[0002] With the rapid development of modern industry, the application of high-speed motors is becoming increasingly widespread, bringing with it problems such as bearing wear and heat generation. Compared with traditional mechanical bearings, magnetic levitation bearings have significant advantages such as no contact, no lubrication, and long lifespan, and have broad application prospects. Currently, active magnetic levitation bearings are widely used and can be divided into axial and radial types according to the load direction. Radial magnetic bearings consist of a stator assembly and a rotor assembly. The stator assembly is responsible for generating an electromagnetic field that controls the radial position of the rotor, and the rotor assembly is levitated under the action of this magnetic field. When a radial magnetic bearing is working, the rotor core is repeatedly magnetized with each rotation of the rotor, increasing hysteresis losses. At the same time, according to the law of electromagnetic induction, the alternating magnetic field induces eddy currents inside the rotor core. When the eddy currents flow inside the core, Joule heating is generated due to the influence of material resistance, i.e., eddy current losses, which can easily cause the local temperature of the rotor to be too high, affecting the performance, stability, and service life of the magnetic bearing.

[0003] To reduce eddy current effects, existing technologies often employ a lamination process to manufacture rotor assemblies operating under alternating magnetic fields. Specifically, magnetically conductive materials (such as silicon steel sheets) are cut into specific shapes according to requirements, insulated, and then stacked in a predetermined direction and sequence. They are then assembled into a magnetic levitation bearing rotor assembly through pressing, welding, or bonding. The lamination structure divides the rotor assembly into several thin layers. The alternating magnetic field generates magnetic flux within each thin layer, and eddy currents can only form within a single thin layer, significantly reducing eddy current losses.

[0004] Although lamination technology has achieved some success in suppressing eddy currents, uncontrollable factors such as the reliability of inter-laminate insulation, the tightness of lamination, and the complexity of the process can affect the eddy current suppression effect. Furthermore, in high-speed or high-power magnetic levitation bearing systems, the suppression effect on eddy current losses needs further improvement. Utility Model Content

[0005] The purpose of this invention is to provide an anti-eddy current magnetic levitation bearing rotor assembly, which solves the problem that alternating magnetic fields can induce eddy currents inside the rotor core, forming a closed loop.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This invention provides an anti-eddy current effect magnetic levitation bearing rotor assembly, including a magnetic conductive layer and a first spacer layer.

[0007] The magnetic conductive layer and the first spacer layer are annular in shape. The first spacer layer is disposed between two adjacent magnetic conductive layers and is made of magnetic shielding material. The magnetic conductive layer and the first spacer layer are used to be sleeved on the rotating shaft.

[0008] Optionally, the magnetic conductive layer includes a plurality of magnetically conductive sheets, which are stacked to form the magnetic conductive layer, and adjacent magnetically conductive sheets are connected together.

[0009] Optionally, the first spacer layer is connected to the adjacent magnetically conductive layer.

[0010] Optionally, the thickness of the first spacer layer is less than the thickness of the magnetically conductive layer.

[0011] Optionally, the outer periphery of the magnetically conductive layer is flush with the outer periphery of the first spacer layer.

[0012] Optionally, an annular groove is provided on the outer periphery of the magnetic conductive layer, and a plurality of the annular grooves are arranged along the axial direction of the magnetic conductive layer.

[0013] Furthermore, a second spacer layer is provided inside the annular groove.

[0014] Furthermore, the width of the annular groove is less than half the width of the magnetic conductive layer.

[0015] Furthermore, the distance between adjacent annular grooves must be greater than the thickness of the annular groove.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model discloses an anti-eddy current effect magnetic levitation bearing rotor assembly. Because a first spacer layer is provided between adjacent magnetic conductive layers, and the first spacer layer is a magnetic shielding layer, when an alternating magnetic field induces eddy currents inside the rotor core, the presence of the first spacer layer cuts off the eddy current loop. In this way, the eddy current loop is blocked and cannot form a closed loop, thus solving the problem that an alternating magnetic field will induce eddy currents inside the rotor core to form a closed loop. Attached Figure Description

[0017] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a perspective view of Embodiment 1; Figure 2 yes Figure 1 The cut view shown; Figure 3 yes Figure 1 The sectional view shown; Figure 4 This is a stacked view of the magnetic conductive sheets; Figure 5 This is a perspective view of Embodiment 2; Figure 6 yes Figure 5 The cut view shown; Figure 7 yes Figure 5 The sectional view shown.

[0018] The reference numerals in the attached figures are explained as follows: 1. Magnetic conductive layer; 2. First spacer layer; 11. Magnetic conductive sheet; 12. Annular groove; 13. Second spacer layer. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] Example 1 like Figure 1 and Figure 2 and Figure 3 As shown, an anti-eddy current effect magnetic levitation bearing rotor assembly includes a magnetic conductive layer 1 and a first spacer layer 2. The magnetic conductive layer 1 is capable of conducting magnetism. The magnetic conductive layer 1 and the first spacer layer 2 are annular. The first spacer layer 2 is disposed between two adjacent magnetic conductive layers 1. The first spacer layer 2 is a magnetic shielding material and is not capable of conducting magnetism. The magnetic conductive layer 1 and the first spacer layer 2 are used to be sleeved on the rotating shaft.

[0023] The presence of the first spacer layer 2 cuts off the eddy current loop, preventing the eddy current from forming a closed loop. This can significantly reduce eddy current losses and heat generation. The magnetic conductive layer 1 and the first spacer layer 2 combine to form a rotor assembly, ensuring that the local temperature of the rotor does not become too high and does not affect the performance, stability, and service life of the magnetic bearing.

[0024] The first spacer layer 2 is connected to the adjacent magnetic conductive layer 1. The magnetic conductive layer 1 and the first spacer layer 2 are combined into a rotor assembly by pressing, welding or bonding.

[0025] The thickness of the first spacer layer 2 is less than the thickness of the magnetic layer 1. Eddy current losses are mainly concentrated on the outer surface of the magnetic layer 1. Therefore, the thinner first spacer layer 2 can effectively reduce eddy currents while ensuring the structural strength of the magnetic layer 1.

[0026] The outer periphery of the magnetic conductive layer 1 is flush with the outer periphery of the first spacer layer 2, that is, the outer surface of the magnetic conductive layer 1 is flush with the outer surface of the first spacer layer 2.

[0027] like Figure 4 As shown, the magnetic conductive layer 1 includes multiple magnetically conductive sheets 11, which are stacked to form the magnetic conductive layer 1 and pressed together to form the magnetic conductive layer 1. In this example, the magnetically conductive sheets 11 are silicon steel sheets, and adjacent magnetically conductive sheets 11 are connected together.

[0028] Example 2 like Figure 5 and Figure 6 and Figure 7 As shown, unlike Embodiment 1, the magnetic conductive layer 1 is an integral ring, and an annular groove 12 is provided on the outer periphery of the magnetic conductive layer 1. The opening end of the annular groove 12 faces the radially outward of the magnetic conductive layer 1. The annular groove 12 solves the eddy current problem caused by the integral ring of the existing magnetic levitation bearing rotor, and also solves the problem that the existing magnetic levitation bearing rotor with the laminated assembly structure is difficult to be used for high-speed operation.

[0029] In other embodiments, a plurality of annular grooves 12 are arranged along the axial direction of the magnetically conductive layer 1, and the plurality of annular grooves 12 are evenly arranged.

[0030] A second spacer layer 13 is provided inside the annular groove 12. The second spacer layer 13 is a ring that is snapped into the annular groove 12 to prevent the magnetic layers 1 at the adjacent ends of the annular groove 12 from contacting when the adjacent magnetic layers 1 are squeezed, which would damage the annular groove 12. The second spacer layer 13 has a protective function for the annular groove 12. In addition, the second spacer layer 13 helps to reduce the effect of eddy currents.

[0031] The width of the annular groove 12 is less than half the width of the magnetic conductive layer 1. In the figure, a is marked as the width of the annular groove 12 and A is marked as the width of the magnetic conductive layer 1. In this example, a < 1 / 2A. The smaller width of the annular groove 12 makes the outer surface area of ​​the magnetic conductive layer 1 after slotting smaller than the surface area before slotting. This has no impact on the output force of the magnetic bearing, which means that the working stability of the bearing is guaranteed.

[0032] The distance between adjacent annular grooves 12 must be greater than the thickness of the annular groove 12. In the figure, L is marked as the distance between adjacent annular grooves 12, and the thickness of the annular groove 12 is marked as l. In this example, l = (1 / 5-1 / 2)L.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetic levitation bearing rotor assembly with anti-eddy current effect, comprising a magnetic conductive layer (1) and a first spacer layer (2), characterized in that, The magnetic conductive layer (1) and the first spacer layer (2) are annular. The first spacer layer (2) is disposed between two adjacent magnetic conductive layers (1). The first spacer layer (2) is a magnetic shielding material. The magnetic conductive layer (1) and the first spacer layer (2) are used to be sleeved on the rotating shaft.

2. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 1, characterized in that, The magnetic conductive layer (1) includes a plurality of magnetically conductive sheets (11), which are stacked to form the magnetic conductive layer (1), and adjacent magnetically conductive sheets (11) are connected together.

3. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 1, characterized in that, The first spacer layer (2) is connected to the adjacent magnetic conductive layer (1).

4. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 1, characterized in that, The thickness of the first spacer layer (2) is less than the thickness of the magnetic conductive layer (1).

5. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 1, characterized in that, The outer periphery of the magnetic conductive layer (1) is flush with the outer periphery of the first spacer layer (2).

6. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 1, characterized in that, The magnetic conductive layer (1) has an annular groove (12) on its outer periphery, and a plurality of the annular grooves (12) are arranged along the axial direction of the magnetic conductive layer (1).

7. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 6, characterized in that, A second spacer layer (13) is provided inside the annular groove (12).

8. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 7, characterized in that, The width of the annular groove (12) is less than half the width of the magnetic conductive layer (1).

9. The anti-eddy current effect magnetic levitation bearing rotor assembly according to claim 8, characterized in that, The distance between adjacent annular grooves (12) must be greater than the thickness of the annular groove (12).

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