Axial magnetic bearing stator

Abstract

The utility model discloses an axial magnetic bearing stator which comprises a main stator assembly and an end face magnetic conduction stator assembly. The main stator assembly comprises a magnetic conductive stator iron core, the magnetic conductive stator iron core is radially divided into at least two sub magnetic conductive stator iron cores, each sub magnetic conductive stator iron core is provided with a coil in a back winding manner, and the sub magnetic conductive stator iron cores are combined and connected along the circumferential direction of the rotor shaft; the end face magnetic conduction stator assembly comprises a magnetic conduction side plate, the magnetic conduction side plate is in an annular shape and is divided into at least two sub magnetic conduction side plates in the radial direction, one side face of each sub magnetic conduction side plate is provided with a gasket, and the sub magnetic conduction side plates are combined and connected in the circumferential direction of the rotor shaft. The side face, provided with the gasket, of the combined magnetic conductive side plate is connected with the side face, away from the thrust disc, of the combined magnetic conductive stator iron core in an assembled mode. The main stator assembly and the end face magnetic conduction stator assembly are both designed in a split type structure, and installation and use of thrust discs with different diameters and axial magnetic bearings under a motor rotor can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic suspension bearings, in particular to an axial magnetic bearing stator. Background Art

[0002] Magnetic bearings have the advantages of no contact, no wear, no need for lubrication, high speed, and high precision, so they are widely used in the field of high-speed motors. Magnetic high-speed motors are rotors that achieve high-speed rotation under the bearing capacity of the magnetic field. According to the direction of the bearing capacity, magnetic bearings are divided into radial magnetic bearings and axial magnetic bearings. Under the conventional axial magnetic bearing structure, the rotor thrust plate has a large diameter, and the centrifugal stress generated by high-speed rotation is large, which makes it easy to damage. In order to meet the high-speed development of motors, solid integrated rotors and thrust plates have become a development trend, that is, the thrust plate on the rotor shaft and the motor rotor cannot be disassembled. When the outer diameter of the motor rotor is equivalent to the outer diameter of the thrust plate, the axial magnetic bearing stator cannot be assembled between the motor rotor and the thrust plate under the conventional axial magnetic bearing stator structure, thereby limiting the high-speed development of the magnetic levitation rotor.

[0003] In view of this, it is necessary to improve the existing technology. Utility Model Content

[0004] The purpose of the utility model is to provide an axial magnetic bearing stator, aiming to solve at least one of the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solution adopted is as follows:

[0005] An axial magnetic bearing stator comprises a main stator assembly and an end-face magnetic conductive stator assembly;

[0006] The main stator assembly includes a magnetic stator core, which includes an inner ring and an outer ring arranged coaxially, the inner ring and the outer ring are connected by an annular plate, annular wire grooves are formed on the inner and outer sides of the annular plate respectively, the magnetic stator core is radially divided into at least two sub-magnetic stator cores, each sub-magnetic stator core is back-wound with a coil, each sub-magnetic stator core is combined and connected along the circumference of the rotor shaft, and there is a gap between the combined magnetic stator core and the thrust plate;

[0007] The end face magnetic conductive stator assembly includes a magnetic conductive side plate, which is annular and radially divided into at least two sub-magnetic conductive side plates. A gasket is provided on one side of each sub-magnetic conductive side plate. The sub-magnetic conductive side plates are combined and connected along the circumferential direction of the rotor shaft. A side of the combined magnetic conductive side plate with the gasket is assembled and connected to a side of the combined magnetic conductive stator core away from the thrust plate.

[0008] Preferably, the inner diameter of the assembled magnetically conductive stator core is larger than the outer diameter of the rotor shaft.

[0009] Preferably, the inner diameter of the assembled magnetic conductive side plate is larger than the outer diameter of the rotor shaft.

[0010] Preferably, the main stator assembly, the end-face magnetically conductive stator assembly and the rotor shaft are coaxially arranged.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model discloses an axial magnetic bearing stator. The main stator component and the end surface magnetic conductive stator component both adopt a split structure design, which can meet the installation and use of axial magnetic bearings under thrust plates and motor rotors of different diameters. In addition, compared with the axial magnetic bearings of the current conventional structure, the thrust density is improved, which provides a solution to the limitations of the high-speed and miniaturized development of magnetic bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is an exploded diagram of the stator of the axial magnetic bearing of the utility model.

[0015] Figure 2 It is a structural diagram of the magnetically conductive stator core and coil of the utility model.

[0016] Figure 3 This is a structural diagram of the stator assembly of the axial magnetic bearing of the utility model.

[0017] Figure 4 It is an axial cross-sectional view of the stator assembly of the axial magnetic bearing of the utility model.

[0018] In the figure: 1, inner ring; 2, outer ring; 3, annular plate; 4, motor rotor; 5, thrust plate; 6, rotor shaft; 7, sub-magnetic stator core; 8, coil; 9, sub-magnetic side plate; 10, gasket. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] like Figures 1 to 4 As shown, a preferred embodiment of the utility model provides an axial magnetic bearing stator, including a main stator assembly and an end surface magnetic conductive stator assembly.

[0022] The main stator assembly includes a magnetic stator core, specifically, the magnetic stator core includes an inner ring 1, an outer ring 2 and an annular plate 3, the inner ring 1 and the outer ring 2 are coaxially arranged, the annular plate 3 is located between the inner ring 1 and the outer ring 2, the inner edge of the annular plate 3 is fixedly connected to the outer wall of the inner ring 1, and the outer edge of the annular plate 3 is fixedly connected to the inner wall of the outer ring 2. Based on the above structure, annular wire grooves are formed on the inner and outer sides of the annular plate 3 for winding coils.

[0023] In order to facilitate the installation of the magnetic stator core on the rotor shaft 6 between the motor rotor 4 and the thrust plate 5, the magnetic stator core is radially divided into at least two sub-magnetic stator cores 7. The utility model preferably divides it into two sub-magnetic stator cores 7, and each sub-magnetic stator core 7 is back-wound with a coil 8, that is, the inner and outer sides of the sub-magnetic stator core 7 are wound with the coil 8, thereby realizing the splitting of the axial magnetic bearing coil and solving the problem that the coil part in the split structure of the axial magnetic suspension bearing is difficult to split.

[0024] Each sub-magnetic stator core 7 is combined and connected along the circumference of the rotor shaft 6. Specifically, each sub-magnetic stator core 7 is fixedly installed in the external casing. There is a gap between the combined magnetic stator core and the thrust plate 5. The inner diameter of the combined magnetic stator core is larger than the outer diameter of the rotor shaft 6.

[0025] Among them, the end face magnetic conductive stator assembly includes a magnetic conductive side plate, which is annular. In order to facilitate the installation of the magnetic conductive side plate on the rotor shaft 6, the magnetic conductive side plate is radially divided into at least two sub-magnetic conductive side plates 9. The utility model preferably divides it into two sub-magnetic conductive side plates 9, and a gasket 10 is respectively arranged on one side of each sub-magnetic conductive side plate 9.

[0026] Each sub-magnetic conductive side plate 9 is assembled and connected along the circumferential direction of the rotor shaft 6. One side of the assembled magnetic conductive side plate with a gasket 10 is assembled and connected with the side of the assembled magnetic conductive stator core away from the thrust plate 5. It is specifically fixed by bolts and positioned with pins. The inner diameter of the assembled magnetic conductive side plate is larger than the outer diameter of the rotor shaft 6.

[0027] Furthermore, the main stator assembly, the end-face magnetically conductive stator assembly and the rotor shaft 6 are coaxially arranged.

[0028] The gaskets are combined to form an annular gasket, which is located between the magnetic stator core and the magnetic side plate, solving the problem of excessive inductance of the closed magnetic circuit. In addition, by adjusting the thickness of the gasket, the inductance value can be reduced, thereby improving the dynamic performance of the magnetic control, provided that the magnetic leakage of the magnetic bearing does not interfere with other electromagnetic devices.

[0029] The above-mentioned main stator assembly and end face magnetic stator assembly both adopt a split structural design, which can meet the installation and use of axial magnetic bearings under thrust plates 5 and motor rotors 4 of different diameters. In addition, compared with the current conventional structure of axial magnetic bearings, the thrust density is improved, providing a solution to the limitations of high-speed and miniaturized development of magnetic bearings.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An axial magnetic bearing stator, characterized in that: It includes a main stator assembly and an end-face magnetic conductive stator assembly; The main stator assembly includes a magnetic stator core, which includes an inner ring and an outer ring arranged coaxially, the inner ring and the outer ring are connected by an annular plate, annular wire grooves are formed on the inner and outer sides of the annular plate respectively, the magnetic stator core is radially divided into at least two sub-magnetic stator cores, each sub-magnetic stator core is back-wound with a coil, each sub-magnetic stator core is combined and connected along the circumference of the rotor shaft, and there is a gap between the combined magnetic stator core and the thrust plate; The end face magnetic conductive stator assembly includes a magnetic conductive side plate, which is annular and radially divided into at least two sub-magnetic conductive side plates. A gasket is provided on one side of each sub-magnetic conductive side plate. The sub-magnetic conductive side plates are combined and connected along the circumferential direction of the rotor shaft. A side of the combined magnetic conductive side plate with the gasket is assembled and connected to a side of the combined magnetic conductive stator core away from the thrust plate.

2. An axial magnetic bearing stator according to claim 1, characterized in that: The inner diameter of the assembled magnetic stator core is larger than the outer diameter of the rotor shaft.

3. The axial magnetic bearing stator according to claim 1, characterized in that: The inner diameter of the assembled magnetic conductive side plate is larger than the outer diameter of the rotor shaft.

4. The axial magnetic bearing stator according to claim 1, characterized in that: The main stator assembly, the end-face magnetic conductive stator assembly and the rotor shaft are coaxially arranged.

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