A hybrid magnetic bearing system

Abstract

The present invention discloses a hybrid magnetic bearing system, including a stator structure and a rotor structure, wherein the rotor structure is arranged on the inner side of the stator structure, and the rotor structure includes a bearing main shaft and a magnetic ring connected to the bearing main shaft, and the two ends of the bearing main shaft are supported by radial bearings, and the radial bearings allow the rotor structure to rotate in the stator structure without contact. The hybrid magnetic bearing system of the present invention is a hybrid magnetic bearing system structure that combines active suspension with passive suspension. By integrating the design of the motor / generator with the design of the axial bearing, and adopting a passive suspension uncontrolled structure, the design structure of the magnetic bearing is greatly simplified. In the design of the radial bearing, a magnet structure of electromagnetic and permanent magnetic hybrid suspension is adopted to achieve the goal of energy saving.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing components, and in particular relates to a hybrid magnetic bearing system. Background Art

[0002] Magnetic bearings use magnetic force to suspend the rotor in the air, so that there is no mechanical contact between the rotor and the stator. The principle is that the magnetic induction line is perpendicular to the magnetic levitation line, and the shaft core is parallel to the magnetic levitation line, so the weight of the rotor is fixed on the running track, and the shaft core is supported in the direction opposite to the magnetic levitation line with almost no load, so that the entire rotor is suspended in the air and on a fixed running track.

[0003] In terms of application, magnetic bearings are mostly used as rotors of generators or motors. Existing magnetic bearings mostly use a structure in which radial bearings and axial bearings are independently designed and controlled. Their control and structure are relatively complex, which also leads to an increase in equipment costs. Therefore, the current structural design of magnetic bearings mostly adopts the concept of separate design of the rotor and magnetic bearings, which increases the complexity of the structure and design on the one hand, and also increases the weight of the rotor on the other hand, which brings limitations on the speed increase. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a hybrid magnetic bearing system.

[0005] To achieve the above objectives, the specific technical solution of the hybrid magnetic bearing system of the present invention is as follows:

[0006] A hybrid magnetic bearing system comprises a stator structure and a rotor structure. The rotor structure is arranged on the inner side of the stator structure. The rotor structure comprises a bearing main shaft and a magnetic ring connected to the bearing main shaft. Both ends of the bearing main shaft are supported by radial bearings. The radial bearings allow the rotor structure to rotate in contactless suspension within the stator structure.

[0007] Furthermore, the magnetic ring of the rotor structure is an annular Halbach permanent magnet array.

[0008] Furthermore, the annular Halbach permanent magnet array is fixedly connected to the bearing main shaft through a connecting assembly to form a rotor structure, and the annular Halbach permanent magnet array is arranged in the middle of the bearing main shaft.

[0009] Furthermore, the bearing main shaft is a hollow structure.

[0010] Furthermore, the stator structure includes an annular metal plate made of conductive non-magnetic material, and the Halbach permanent magnet array and at least part of the annular metal plate are radially arranged opposite to each other. The rotating annular Halbach permanent magnet array can generate electromagnetic repulsion between the annular metal plate to bear the axial dynamic load during the rotation of the rotor structure.

[0011] Furthermore, the stator structure also includes a stator winding. The annular metal plates are arranged on both sides of the stator structure. The stator winding is arranged between the annular metal plates on both sides. The stator winding is in the shape of an elongated ring. The length direction of the stator winding is consistent with the length direction of the bearing main shaft.

[0012] Furthermore, the annular metal plate is a copper plate or an aluminum plate, the stator winding is arranged on the radial inner side of the annular metal plates on both sides, and the stator core is arranged in the stator winding.

[0013] Furthermore, both ends of the bearing main shaft are supported by radial bearings, and the radial bearings include an annular iron core and a permanent magnet embedded in the annular iron core.

[0014] Furthermore, a recessed portion is formed on the inner ring edge of the annular core, and a winding coil is arranged in the recessed portion.

[0015] Furthermore, the recessed portion is radially aligned with the permanent magnet.

[0016] The hybrid magnetic bearing system of the present invention is a hybrid magnetic bearing system structure that combines active suspension and passive suspension. By integrating the design of the motor / generator with the design of the axial bearing and adopting a passive suspension uncontrolled structure, the design structure of the magnetic bearing is greatly simplified. In the design of the radial bearing, a magnet structure of electromagnetic and permanent magnet hybrid suspension is adopted to achieve the goal of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of a hybrid magnetic bearing system of the present invention;

[0018] Figure 2 for Figure 1 A cross-sectional view of a hybrid magnetic bearing system;

[0019] Figure 3 A schematic diagram of the structure of the rotor in the hybrid magnetic bearing system of the present invention;

[0020] Figure 4 for Figure 3 a cross-sectional view of the middle rotor assembly;

[0021] Figure 5 for Figure 3 An annular Halbach permanent magnet array in the rotor assembly shown;

[0022] Figure 6 It is a structural schematic diagram of the hybrid magnetic bearing system and the stator structure of the present invention;

[0023] Figure 7 is a cross-sectional view of the motor coil in the stator structure;

[0024] Figure 8 is a cross-sectional view of the metal plate in the stator structure;

[0025] Fig. 9 A schematic cross-sectional view of a radial bearing in the hybrid magnetic bearing system of the present invention. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the present invention, the hybrid magnetic bearing system of the present invention is further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1-2 As shown, the hybrid magnetic bearing system of the present invention includes a stator structure 10 and a rotor structure 20. The rotor structure 20 is arranged inside the stator structure 10. The rotor structure 20 can be supported by the stator structure 10 and rotate inside the stator structure 10. The bearing main shaft 21 in the rotor structure 20 can be supported by radial bearings 30 at both ends. The radial bearings 30 can allow the rotor structure 20 to rotate in contactless suspension inside the stator structure 10.

[0028] like Figure 1-5 As shown, the stator structure 10 includes a bearing main shaft 21 and an annular permanent magnet array 22 fixedly connected to the bearing main shaft 21, that is, the stator structure 10 includes the bearing main shaft 21 and the annular permanent magnet array 22 fixedly connected to each other, and the annular permanent magnet array 22 can be fixedly connected to the bearing main shaft 21 through a connecting component 23, thereby forming an integral body as a rotor structure 20.

[0029] The annular permanent magnet array 22 is disposed in the middle of the bearing spindle 21. The annular permanent magnet array 22 preferably adopts a Halbach structure (see Figure 5 ), that is, the annular permanent magnet array 22 is an annular Halbach permanent magnet array. The bearing main shaft 21 adopts a common cylindrical structure. If the weight reduction and the need for suitable rigidity and strength of the rotating shaft are considered, the bearing main shaft 21 can be set to a hollow structure.

[0030] Preferably, in the Halbach magnetic ring, the circular Halbach array includes 10-20 even-numbered magnetic poles, for example, divided into 16 equal parts (it can also be divided in different proportions according to actual requirements), each equal part is assisted by different magnetization angles to form 4 magnetic poles (NSNS), and the specific number of magnetic poles and array division can be determined according to actual needs, such as load-bearing capacity, motor speed limit, etc.

[0031] like Figure 1-2 and Figure 6-8 As shown, the hybrid magnetic bearing system is designed in combination with the stator structure 10 of the motor. The stator structure 10 of the motor or generator adopts an assembled annular plate structure. Both sides of the stator structure 10 are annular metal plates 11 made of conductive non-magnetic materials (such as copper, aluminum, etc.). The stator winding 12 is used in the middle. The stator winding 12 serves as the stator of the motor. After the stator winding 12 is energized, the rotor structure will realize the rotation function, that is, the motor is in a rotating working state only after the stator winding 12 is energized.

[0032] The stator winding 12 is in the shape of a long strip ring, and the length direction of the stator winding 12 is consistent with the length direction of the bearing main shaft 21. Therefore, the stator structure 10 adopts a three-section annular plate series structure, with conductive and non-magnetic metal plates (copper plates or aluminum plates) on both sides, the stator winding 12 in the middle, and the two ends of the stator winding 12 are connected in series with the annular metal plates 11 on both sides. Preferably, the stator winding 12 is arranged on the inner side of the annular metal plates 11 on both sides, that is, on the side close to the rotor structure 20.

[0033] According to the speed requirement, a stator core can be provided in the stator winding 12. The core can be made of a laminated silicon steel sheet structure to achieve magnetic concentration. The laminated silicon steel sheet structure can also reduce the magnetic resistance caused by the eddy current effect. A shell is provided on the outside of the stator structure 10 to encapsulate and protect the hybrid magnetic bearing system.

[0034] like Fig. 9 As shown, the radial bearing 30 of the present invention is shown. The hybrid magnetic bearing system adopts an electromagnetic and permanent magnet hybrid structure. For the bearing main shaft 21 of the rotor structure 20, both ends of the bearing main shaft 21 are supported by radial bearings 30. The radial bearing 30 includes an annular iron core 31 and a permanent magnet 32 ​​embedded in the annular iron core. The inner ring edge of the annular iron core 31 forms a recessed portion, and a winding coil 33 is arranged in the recessed portion. The winding coil 33 is an electromagnetic structural component. When the winding coil 33 is energized, an electromagnetic magnetic force is generated. The magnetic force is used to balance the dynamic force of the motor rotor structure when the motor rotates. The recessed portion is aligned with the permanent magnet, so that the winding coil is also aligned with the permanent magnet 32.

[0035] Thus, the static magnetic force of the permanent magnet 32 ​​on the radial bearing 30 is used to offset / support the weight of the rotor structure 20, and the electromagnetic force generated when the winding coil is energized is used to adjust the dynamic balance of the rotor structure during rotation. When the stator winding 12 is energized, the rotor structure 20 in the hybrid magnetic bearing system starts to rotate, and the electromagnetic force provided by the electromagnet composed of the winding coil 33 and the annular iron core 31 is used to bear the radial dynamic load of the rotor structure 20, and the passive suspension structure composed of the annular metal plate 11 and the rotating annular Halbach permanent magnet array (the rotating annular Halbach permanent magnet array can generate electromagnetic repulsion with the annular metal plate 11) is used to bear the axial dynamic load of the rotor structure 20 during rotation.

[0036] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A hybrid magnetic bearing system, characterized in that: The invention comprises a stator structure and a rotor structure, wherein the rotor structure is arranged on the inner side of the stator structure, the rotor structure comprises a bearing main shaft and a magnetic ring connected to the bearing main shaft, the two ends of the bearing main shaft are supported by radial bearings, the radial bearing comprises an annular iron core and a permanent magnet embedded in the annular iron core, the radial bearing allows the rotor structure to rotate in the stator structure without contact, the magnetic ring of the rotor structure is an annular Halbach permanent magnet array, the annular Halbach permanent magnet array is fixedly connected to the bearing main shaft through a connecting component to form the rotor structure, the annular Halbach permanent magnet array is arranged in the middle of the bearing main shaft, the stator structure comprises a conductive non-magnetic material An annular metal plate, a Halbach permanent magnet array and at least part of the annular metal plate are arranged radially opposite to each other, the rotating annular Halbach permanent magnet array can generate electromagnetic repulsion between the annular metal plate to bear the axial dynamic load during the rotation of the rotor structure, the stator structure also includes a stator winding, the annular metal plates are arranged on both sides of the stator structure, the stator winding is arranged between the annular metal plates on both sides, the stator winding is a long strip ring, the length direction of the stator winding is consistent with the length direction of the bearing main shaft, the inner ring edge of the annular core also forms a recessed portion, a winding coil is arranged in the recessed portion, and the recessed portion is radially aligned with the permanent magnet.

2. The hybrid magnetic bearing system according to claim 1, characterized in that: The bearing spindle is a hollow structure.

3. The hybrid magnetic bearing system according to claim 2, characterized in that: The annular metal plate is a copper plate or an aluminum plate. The stator winding is arranged on the radial inner side of the annular metal plates on both sides. The stator iron core is arranged in the stator winding.

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