CN111075838A

CN111075838A - Radial non-coupling quadrupole hybrid magnetic bearing

Info

Publication number: CN111075838A
Application number: CN202010055284.XA
Authority: CN
Inventors: 武莎莎; 鲍朋; 顾权镐; 张涛; 朱为国; 叶小婷; 鲁庆; 莫丽红; 陈万
Original assignee: Huaiyin Institute of Technology
Current assignee: Huaiyin Institute of Technology
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-04-28

Abstract

The invention discloses a radial non-coupling quadrupole hybrid magnetic bearing, which comprises a stator and a rotor positioned in an inner ring of the stator. The stator consists of an X stator iron core, a permanent magnet ring and a Y stator iron core which are sequentially arranged from left to right; the rotor comprises a cylindrical rotor iron core and a rotating shaft; two suspension teeth are uniformly distributed at symmetrical positions of the X stator core along the inner circumference and the directions of the + X axis and the-X axis; two suspension teeth are uniformly distributed at symmetrical positions of the Y stator core along the inner circumference and the directions of the + Y axis and the-Y axis; the suspension teeth are all of a zigzag structure, one end face of each suspension tooth close to the rotor core is matched with the circumferential surface of the rotor core in radian and is the same as the axial width of the rotor core and is opposite to the rotor core in position, and radial air gaps with the same air gap length are formed between the suspension teeth and the rotor core; and a centralized radial control winding is wound on each of the four suspension teeth. The invention realizes independent design of X and Y direction suspension, realizes no coupling of suspension force in X-Y direction, and has simple control.

Description

Radial non-coupling quadrupole hybrid magnetic bearing

Technical Field

The invention relates to a non-mechanical contact magnetic bearing, in particular to a radial non-coupling quadrupole hybrid magnetic bearing which can be used as a non-contact suspension support of high-speed transmission parts such as a flywheel system, a machine tool electric spindle, a centrifugal machine and the like.

Background

The magnetic bearing is a novel high-performance bearing which suspends a rotor in a space by utilizing electromagnetic force between a stator and the rotor so that the stator and the rotor are not in mechanical contact. Currently, magnetic bearings are classified into the following three types according to the manner in which magnetic force is provided: (1) the active magnetic bearing generates a bias magnetic field by bias current, and the control magnetic flux generated by the control current is mutually superposed with the bias magnetic flux so as to generate controllable suspension force, and the magnetic bearing has larger volume, weight and power consumption; (2) the passive magnetic bearing has the advantages that the suspension force is completely provided by the permanent magnet, the required controller is simple, the suspension power consumption is low, but the rigidity and the damping are small, and the passive magnetic bearing is generally applied to supporting an object in one direction or reducing the load acting on the traditional bearing; (3) the hybrid magnetic bearing adopts permanent magnetic materials to replace electromagnets in an active magnetic bearing to generate a bias magnetic field, and control current only provides control magnetic flux for balancing load or interference, thereby greatly reducing the power loss of the magnetic bearing, reducing the volume of the magnetic bearing, lightening the weight of the magnetic bearing and improving the bearing capacity.

The structural commonality of the existing hybrid magnetic bearing is a single-chip structural design that all radial suspension teeth are on the same plane, and the radial suspension teeth wind a control winding to generate radial control magnetic flux which interacts with corresponding bias magnetic flux to generate radial suspension force. The radial two-degree-of-freedom suspension of the hybrid magnetic bearing with the structure is realized in a single piece, so that the suspension force is coupled in the XY direction, and the control is complex.

Disclosure of Invention

The invention aims to provide a radial non-coupling quadrupole hybrid magnetic bearing structure which adopts a double-sheet structure, wherein suspension in XY directions is realized by independent stator cores respectively, suspension force is not coupled in the X-Y directions, the control is simple, the structure is compact, and the manufacture and the assembly are convenient.

The invention is realized by the following technical scheme:

a radial non-coupling quadrupole hybrid magnetic bearing comprises a stator and a rotor positioned in an inner ring of the stator, wherein the stator comprises an X stator iron core, a permanent magnet ring and a Y stator iron core which are sequentially arranged from left to right; the rotor comprises a cylindrical rotor iron core and a rotating shaft, and the rotating shaft penetrates through the X stator iron core, the permanent magnet ring, the Y stator iron core and the rotor iron core; the X stator core is uniformly provided with two suspension teeth along the inner circumference and at the positions symmetrical to the + X axis and the-X axis; two suspension teeth are uniformly distributed on the Y stator iron core along the inner circumference and at positions symmetrical to the + Y axis and the-Y axis; the suspension teeth are all of a zigzag structure, one end face of each suspension tooth close to the rotor core is matched with the circumferential surface of the rotor core in radian and is the same as the axial width of the rotor core and is opposite to the rotor core in position, and radial air gaps with the same air gap length are formed between the suspension teeth and the rotor core; and centralized radial control windings are wound on the suspension teeth.

Further, the outer diameter of the permanent magnet ring is the same as that of the X stator core and the Y stator core.

Further, X, Y the stator core and the rotor core are made of magnetic conductive materials.

Further, the permanent magnet ring is made of rare earth permanent magnet materials.

Has the advantages that:

the invention adopts a double-sheet structure, the suspension in the X, Y two directions is respectively realized by independent stator iron cores, the suspension teeth on the stator iron cores are designed into a zigzag shape, so that the stator iron cores are coplanar with the rotor iron cores, thus ensuring that one ends of 4 suspension teeth in the X and Y directions, which are close to the rotor iron cores, are opposite to the rotor iron cores, the suspension force is not coupled in the X-Y direction, the control is simple, the structure is compact, and the manufacture and the assembly are convenient.

Drawings

Fig. 1 is a structural diagram and a suspension magnetic flux diagram of a radial decoupled quadrupole hybrid magnetic bearing according to the present invention.

The magnetic control device comprises a 1-X stator core, a 2-Y stator core, a 3-permanent magnet ring, a 4-radial control winding, a 401-first radial control winding, a 402-second radial control winding, a 403-third radial control winding, a 404-fourth radial control winding, a 5-rotor core, a 6-rotating shaft, a 7-suspension tooth A, an 8-suspension tooth B, a 9-suspension tooth C, a 10-suspension tooth D, an 11-static bias magnetic flux, a 12-X direction radial control magnetic flux and a 13-Y direction radial control magnetic flux.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1 shows a radial decoupled quadrupole hybrid magnetic bearing disclosed in the present invention, which includes a stator and a rotor located in an inner ring of the stator.

The stator comprises an X stator iron core 1, a permanent magnet ring 3 and a Y stator iron core 2 which are sequentially arranged from left to right. The outer diameters of the X stator iron core 1, the permanent magnet ring 3 and the Y stator iron core 2 are the same, the three are circular rings, and the radial thicknesses of the circular rings are the same. The rotor comprises a rotor core 5 and a rotating shaft 6, wherein the rotor core 5 is of a cylindrical structure, and the rotating shaft 6 penetrates through the rotor core. Two suspension teeth, namely suspension teeth A7 and suspension teeth B8, are uniformly distributed along the inner circumference of the X stator core 1 and are respectively aligned with the + X axis and the-X axis, namely the connecting line of the two suspension teeth passes through the circle center of the circular ring of the X stator core 1. Two suspension teeth, namely a suspension tooth C9 and a suspension tooth D10, are uniformly distributed along the inner circumference of the Y stator core 2 and are respectively aligned with the + Y axis and the-Y axis, namely the connecting line of the two suspension teeth passes through the circle center of the circular ring of the Y stator core 2 and is vertical to the connecting line of the suspension tooth A7 and the suspension tooth B8. The suspension teeth (suspension teeth A7, B8, C9 and D10) are all of a zigzag structure, the suspension teeth A7 and B8 are bent towards the position close to the Y stator core 2, the suspension teeth C9 and D10 are bent towards the position close to the X stator core 1 (the suspension teeth on the two stator cores are bent towards opposite directions), and the suspension teeth are superposed with the orthographic projection of the left edge and the right edge of the vertical part of the rotor core 5, namely one end surface of the suspension teeth close to the rotor core 5 is matched with the circumferential surface of the rotor core 5 in radian, and the end surface of the suspension teeth is the same as the axial width of the rotor core 5 and is opposite to the position. The length of a radial air gap formed between one end of each suspension tooth close to the rotor core 5 and the rotor core 5 is equal. A centralized radial control winding 4 is wound on each suspension tooth (suspension tooth a7, suspension tooth B8, suspension tooth C9 and suspension tooth D10), referring to fig. 1, a second radial control winding 402 is wound on the suspension tooth a7, a fourth radial control winding 404 is wound on the suspension tooth B8, a first radial control winding 401 is wound on the suspension tooth C9, and a third radial control winding 403 is wound on the suspension tooth D10.

The magnetization direction of the axial permanent magnet ring 3 is a right N pole and a left S pole, and the generated static bias magnetic flux 11 passes through the yoke part of the Y stator core 2, the floating teeth C9 and the floating teeth D10 on the Y stator core 2, the rotor core 5, the floating teeth a7 and the floating teeth B8 on the X stator core 1, and the yoke part of the X stator core 2 from the N pole and returns to the S pole.

The X-direction radial control magnetic flux 12 generated by the radial control windings (the second radial control winding 402 and the fourth radial control winding 404) wound on the suspension teeth A7 and the suspension teeth B8 respectively passes through the yoke part of the X stator core 1, and the suspension teeth A7 and the suspension teeth B8 on the X stator core 1 and the rotor core 5 form a closed loop; the Y-direction radial control magnetic flux 13 generated by the radial control windings (the first radial control winding 401 and the third radial control winding 403) wound around the floating tooth C9 and the floating tooth D10 passes through the yoke portion of the Y stator core 2, and the floating tooth C9, the floating tooth D10 and the rotor core 5 on the Y stator core 2 form a closed loop, respectively.

Suspension principle: the static bias magnetic flux 11 in the radial direction interacts with the X-direction radial control magnetic flux 12 and the Y-direction radial control magnetic flux 13, so that the air-gap magnetic field on the same side with the radial eccentric direction of the rotor is weakened in a superimposed mode, the air-gap magnetic field on the opposite direction is strengthened in a superimposed mode, force opposite to the offset direction of the rotor is generated on the rotor, and the rotor is pulled back to the radial balance position.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims

1. A radial non-coupling quadrupole hybrid magnetic bearing comprises a stator and a rotor positioned in an inner ring of the stator, and is characterized in that the stator comprises an X stator iron core, a permanent magnet ring and a Y stator iron core which are sequentially arranged from left to right; the rotor comprises a rotor iron core and a rotating shaft, and the rotating shaft penetrates through the X stator iron core, the permanent magnet ring, the Y stator iron core and the rotor iron core; the X stator core is uniformly provided with two suspension teeth along the inner circumference and at the positions symmetrical to the + X axis and the-X axis; two suspension teeth are uniformly distributed on the Y stator iron core along the inner circumference and at positions symmetrical to the + Y axis and the-Y axis; the suspension teeth are all of a zigzag structure, one end face of each suspension tooth close to the rotor core is matched with the circumferential surface of the rotor core in radian and is the same as the axial width of the rotor core and is opposite to the rotor core in position, and radial air gaps with the same air gap length are formed between the suspension teeth and the rotor core; and centralized radial control windings are wound on the suspension teeth.

2. The radial uncoupled quadrupole hybrid magnetic bearing of claim 1, wherein the permanent magnet ring has the same outer diameter as the X and Y stator cores.

3. The radial decoupled quadrupole hybrid magnetic bearing of claim 1, wherein the X, Y stator and rotor cores are made of magnetically conductive material.

4. The radial decoupled quadrupole hybrid magnetic bearing of claim 1, wherein the permanent magnet rings are made of a rare earth permanent magnet material.