CN212028329U - New structure same-polarity quadrupole magnetic bearing - Google Patents

Abstract

The utility model discloses a new structure same-polarity four-pole magnetic bearing, which comprises a stator and a rotor located in the inner ring of the stator. The stator is an axially symmetrical structure, including the left X stator core, the left Y stator core, the right X stator core, the right Y stator core, and the rotor includes the rotor core and the rotating shaft; the left and right X stator cores and the left and right stator cores. The right Y stator iron cores are respectively connected by connecting bodies inserted into four permanent magnets with the same axial magnetization direction. The left and right X stator iron cores evenly distribute a pair of suspended teeth along the inner circumference; the left and right Y stator iron cores are arranged along the inner circumference. A pair of suspension teeth are evenly distributed around the circumference; the suspension teeth are of a zigzag structure, the left and right sides of the suspension teeth are radially coplanar, and a radial air gap of equal length is formed between the suspension teeth and the rotor core, on which the winding is concentrated. Type radial control winding. The X- and Y-direction suspension of the utility model is independently designed, so that the suspension force is not coupled in the X-Y direction, the permanent magnet is located in the axial direction, does not occupy the radial space, and the radial suspension force is large.

Description

New structure same-polarity quadrupole magnetic bearing

technical field

The utility model relates to a non-mechanical contact magnetic bearing, in particular to a four-pole magnetic bearing of the same polarity with a new structure, which can be used as a non-contact suspension support for high-speed transmission components such as a flywheel system, an electric spindle of a machine tool, and a centrifuge.

Background technique

Magnetic bearing is a new type of high-performance bearing that uses the electromagnetic force between the stator and the rotor to suspend the rotor in the space, so that there is no mechanical contact between the stator and the rotor. With the emergence of rare earth permanent magnet materials with high magnetic energy product, in order to make full use of the magnetic energy provided by permanent magnet materials, permanent magnet bias magnetic bearings have appeared. The excitation windings only have control current and no bias current is required, which can significantly reduce the magnetic bearing capacity. losses and power consumption of the power amplifier circuit. At present, permanent magnet bias magnetic bearings can be divided into heteropolar and homopolar magnetic bearings according to the similarities and differences of the magnetic poles formed by the bias magnetic flux on the stator magnetic poles: (1) Heteropolar magnetic bearings, the The magnetic polarities are different, the polarities are arranged alternately, and the bias magnetic flux and the control magnetic flux circulate on one plane; (2) Magnetic bearings of the same polarity, the magnetic polarity generated by the permanent magnets on the stator magnetic poles is the same, and the bias magnetic flux and The flow path of the control magnetic flux is not on the same plane. The magnetic hysteresis loss on the rotor core of this type of magnetic bearing is small, and the control is simple. It has been widely used in high-speed occasions such as momentum flywheel and flywheel energy storage.

The commonality of the existing same-polarity magnetic bearing structures is a single-piece structure design in which all the radially suspended teeth are in the same plane. The radially suspended teeth are wound on the control winding to generate a radial control magnetic flux, which interacts with the corresponding bias magnetic flux. Generate radial suspension force. The hybrid magnetic bearing of this structure has two radial degrees of freedom suspended in a single piece, which leads to the coupling of the levitation force in the X-Y direction, and the control is complicated.

SUMMARY OF THE INVENTION

The purpose of this utility model is to propose a new structure of the same-polarity quadrupole magnetic bearing structure, which adopts a multi-piece structure, the suspension in the X-Y direction is realized by an independent stator iron core, the suspension force is not coupled in the X-Y direction, and the control Simple.

The utility model is realized through the following technical solutions:

A new structure same-polarity four-pole magnetic bearing includes a stator and a rotor located in the inner ring of the stator. The stator is an axially symmetrical structure, including a left X stator iron core and a left Y stator iron core arranged in sequence from left to right. , Right X stator iron core, right Y stator iron core; the rotor includes a rotor iron core and a rotating shaft, and the rotating shaft runs through the rotor iron core;

The left and right X stator cores are respectively connected through a pair of connectors inserted with permanent magnets with the same axial magnetization direction, and the left and right Y stator cores are respectively inserted through another pair of the same structure and the same axial magnetization direction. The connecting bodies of the permanent magnets are connected; the left X stator core is evenly distributed along the inner circumference and a pair of suspended teeth are evenly distributed along the +x axis and the -x axis; the left Y stator core is along the inner circumference and is connected with + The symmetrical positions of the y-axis and the -y-axis are also evenly distributed with a pair of suspended teeth; the right X stator iron core and the right Y stator iron core are provided with the same symmetrical positions as the left X stator iron core and the left Y stator iron core. the suspension teeth;

The suspension teeth are all zigzag structures. The four suspension teeth on the left X stator iron core and the left Y stator iron core have the same axial width and radial coplanarity on one end face of the rotor iron core and are coplanar with the rotor. The radian of the circumferential surface of the iron core is matched; the four suspension teeth on the right X stator iron core and the right Y stator iron core are close to the axial width of one end face of the rotor iron core, are radially coplanar, and are coplanar with the circumferential surface of the rotor iron core The radians are matched; a radial air gap with the same air gap length is formed between the suspension teeth and the rotor core, and centralized radial control windings are wound on the suspension teeth.

Further, the outer diameters of the left and right Y stator cores are smaller than the inner diameters of the left and right X stator cores, and the difference between the two is greater than two radial air gap lengths.

Further, the four connecting bodies are arc-shaped, and have the same radial dimensions, and are respectively located on rings with the same outer diameter as the outer diameter of the left and right X stator cores. Both ends of the inner surface of the pair of connecting bodies of the Y stator iron core near the center of the circle are respectively provided with termination parts, and the left Y stator iron core is connected to the right Y stator iron core through four termination parts.

Further, the left X stator iron core, the left Y stator iron core, the right X stator iron core, the Y stator iron core, the connecting body, the termination part and the rotor iron core are made of magnetically conductive material.

Further, the permanent magnet is made of rare earth permanent magnet material.

Further, the rotating shaft is made of non-magnetic conductive material.

Beneficial effects:

1. The utility model adopts a multi-piece structure, and the suspension in the two directions of X-Y is realized by an independent stator iron core, and the suspension teeth are designed into a zigzag structure, so that the four suspension teeth in the X direction and the Y direction are radially coplanar. , the suspension force has no coupling in the X-Y direction, and the control is simple.

2. In order to ensure that the four permanent magnets have the same size, the present utility model is fixed with a termination part at both ends of the connecting body used to connect the left Y stator iron core with the smaller outer diameter and the right Y stator iron core, and is connected by the termination part. Both, this can ensure that the two connecting bodies have the same radial dimensions as the other two connecting bodies used to connect the left X stator core and the right X stator core, so that the four permanent magnets can be guaranteed to have the same size.

Description of drawings

Fig. 1 is a kind of new structure same-polarity four-pole magnetic bearing structure diagram of the present utility model;

2 is a cross-sectional view of the left X stator iron core and the right X stator iron core of the new structure of the same-polarity four-pole magnetic bearing of the present utility model;

Fig. 3 is the suspended magnetic flux diagram of the same-polarity quadrupole magnetic bearing with the new structure of the present invention.

1-left X stator core, 101-suspended teeth A _l , 102-suspended teeth B _l , 2-left Y stator core, 201-suspended teeth C _l , 202-suspended teeth D _l , 3-right Y stator iron Core, 301-suspended teeth C _r , 302- suspended teeth D _r , 4- right _X stator core, 401- suspended teeth A _r , 402- suspended teeth B _r , 5- permanent magnet Ex , 6- permanent magnet F _x , 7-permanent magnet E _y , 8-permanent magnet F _y , 9-first connection body, 10-second connection body, 11-third connection body, 12-fourth connection body, 13-first termination part, 14-second termination part, 15-third termination part, 16-fourth termination part, 17-radial control winding, 18-rotor core, 19-rotating shaft, 20-radial air gap, 21-Static bias flux, 22-X direction radial control flux, 23-Y direction radial control flux.

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" ", "radial", "circumferential" and other indicated orientations or positional relationships are 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 the indicated A device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection connected, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction between the two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The specific structure is shown in Figures 1-3, a four-degree-of-freedom heteropolar multi-piece structure magnetic bearing disclosed by the present utility model includes a stator and a rotor located in the inner ring of the stator.

The stator has an axially symmetrical structure, including a left X stator iron core 1 , a left Y stator iron core 2 , a right X stator iron core 4 , and a right Y stator iron core 3 arranged in sequence from left to right. The rotor includes a rotor core 18 and a rotating shaft 19 . The rotor iron core 18 has a cylindrical structure, the interior of which penetrates the rotating shaft 19 , and the axial width of the rotor iron core 18 is relatively long. The magnetic bearing also includes four permanent magnets, which are sheet magnets with radians, see Figure 1. The four permanent magnets are all inserted into the connecting body, which are inserted into the middle of the connecting body and are vertically arranged, and the four permanent magnets are arranged vertically. The magnets have the same size, and are respectively denoted as permanent magnet E _x 5, permanent magnet F _x 6, permanent magnet E _y 7, permanent magnet F _y 8, which are all axially magnetized and have the same magnetization direction, see FIG. 1 .

The four connecting bodies are all arc-shaped, with the same radial dimensions and different axial dimensions. The axial lengths of the third connecting body 11 and the fourth connecting body 12 are shorter than those of the first connecting body 9 and the second connecting body 10, respectively. It is located on a cylindrical ring with the same outer diameter as the left X stator core 1 and the right X stator core 4.

The left X stator iron core 1 and the right X stator iron core 4 are connected through the first connecting body 9 and the second connecting body 10, and both ends of the first connecting body 9 and the second connecting body 10 are fixed on the left X stator iron core 1. On the right X stator iron core 4, the first connecting body 9 and the second connecting body 10 are arranged facing each other, and the arc thickness of the four connecting bodies is the same as the left X stator iron core 1, the right X stator iron core 4, the left Y stator The ring thicknesses of the iron core 2 and the right Y stator iron core are the same.

The third connecting body 11 and the fourth connecting body 12 are located in the upper and lower positions, and are arranged opposite to each other, because the left Y stator iron core 2 and the right Y stator iron core 3 have the same size, and the left X stator iron core 1 and the right X stator iron core have the same size. 4 have the same size, the outer diameter of the left Y stator core 2 and the right Y stator core 3 is smaller than the inner diameter of the left X stator core 1 and the right X stator core 4. In order to ensure the same size of the four permanent magnets, 4 The sizes of the connecting bodies are the same, so four connecting bodies are required to be located on the same ring and have the same size. In this case, the left Y stator core 2 and the right Y stator core 3 cannot pass through the third connecting body 11 and the third connecting body. The four connecting bodies 12 are connected. In order to solve this problem, a termination part is added at both ends of the third connecting body 11 and the fourth connecting body 12. Referring to FIG. 1, both ends of the third connecting body 11 are fixed with The two terminal parts are the first terminal part 13 and the second terminal part 14 respectively, and the two ends of the fourth connecting body 12 are fixed with two terminal parts, which are the third terminal part 15 and the fourth terminal respectively. The connecting parts 16 and the four end connecting parts are arc-shaped sheet structures, and the radian is the same as that of the connecting body. It is fixed on the inner surfaces of the third connecting body 11 and the fourth connecting body 12, so that the left Y stator iron core 2 and the right Y stator iron core 3 are connected by 4 terminating parts.

The left X stator core 1 evenly distributes the suspended teeth A 101 and B ₁ 102 along the inner circumference, and the right X stator core 4 evenly distributes the suspended teeth A _r 401 and B _r 402 along the inner circumference, respectively with + _x The axis is aligned with the -x axis direction, that is _{, the connecting line between the suspension teeth A 101 and B 1 102} passes through the center of the ring, and the suspension teeth A _r 401 and B _r 402 are arranged at the same position as the suspension teeth A ₁ 101 and the suspension teeth. The position corresponding to the tooth B _l 102.

The left Y stator core 2 evenly distributes the suspension teeth C ₁ 201 and D ₁ 202 along the inner circumference, and the right Y stator core 3 evenly distributes the suspension teeth C _r 301 and D _r 302 along the inner circumference, respectively with +y The axis is aligned with the -y-axis direction, that is, the connection line between the suspension tooth C ₁ 201 and the suspension tooth D ₁ 202 passes through the center of the ring, and the connection line between the suspension tooth C ₁ 201 and the suspension tooth D ₁ 202 is perpendicular to the suspension tooth A. _l 101 and the suspension tooth B _l 102 are connected. The suspension teeth C _r 301 and D _r 302 are arranged at positions corresponding to the suspension teeth C ₁ 201 and D ₁ 202 .

The 8 suspended teeth are all zigzag structures, and the four suspended teeth on the left X stator core 1 and the left Y stator core 2 (suspended teeth A _l , suspended teeth B _l , suspended teeth C _l , suspended teeth D _l ) One end face close to the rotor iron core 18 has the same axial width, is radially coplanar, and matches the radian of the circumferential surface of the rotor iron core 18 . The four suspended teeth (A _r , _Br , _Cr , D _r ) on the right X stator iron core 3 and the right Y stator iron core 4 are close to the axial width of one end face of the rotor iron core 18 , radially coplanar and coplanar with The radian of the circumferential surface of the rotor core 18 is matched.

Between the 4 suspended teeth on the left (suspended teeth A _l , suspended teeth B _l , suspended teeth C _l , suspended teeth D _l ) and the rotor core 18 , and between the four suspended teeth on the right side (suspended teeth A _r , suspended teeth A r , suspended teeth D l ) Radial air gaps 20 are formed between B _r , suspension teeth _Cr , suspension teeth D _r ) and the rotor iron core 18 , and the radial air gaps 20 have the same length. The outer diameters of the left and right Y stator cores (2, 3) are smaller than the inner diameters of the left and right X stator cores (1, 4), and the difference between the two is greater than the length of the two radial air gaps 20 . Each suspended tooth (suspended tooth A _l , suspended tooth B _l , suspended tooth C _l , suspended tooth D _l , suspended tooth A _r , suspended tooth _Br , suspended tooth C _r , suspended tooth D _r ) is wound in a concentrated manner Type radial control winding 17.

In this embodiment, the left X stator iron core 1, the right X stator iron core 4, the left Y stator iron core 2, the right Y stator iron core 3, and four connecting bodies (the first connecting body 9, the second connecting body 10, the The third connecting body 11, the fourth connecting body 12), the 4 termination parts (the first termination part 13, the second termination part 14, the third termination part 15, the fourth termination part 16) and the rotor iron The cores 18 are all made of magnetically conductive material. Four permanent magnets (permanent magnet E _x 5, permanent magnet F _x 6, permanent magnet E _y 7, permanent magnet F _y 8) are made of rare earth permanent magnet materials. The rotating shaft 19 is made of non-magnetic conductive material.

The static bias magnetic flux 21 generated by 4 permanent magnets (permanent magnet E _x 5, permanent magnet F _x 6, permanent magnet E _y 7, permanent magnet F _y 8), see Figure 3, from permanent magnet E _y 7, The permanent magnet F _y starts from the 8N pole, passes through the third connecting body 11, the fourth connecting body 12, the first end connection part 13, the third end connection part 15, the suspension teeth C ₁ 201, the suspension teeth D ₁ 202, the radial air Gap 20 , rotor core 18 , radial air gap 20 , passing through suspension teeth C _r , suspension teeth D _r , second end connection part 14 , fourth end connection part 16 , third connection body 11 , fourth connection body 12, return to the S pole of the permanent magnet E _y 7 and the permanent magnet F _y 8; the permanent magnet E _x 5, the permanent magnet F _x 6 and the N pole set off, pass through the first connecting body 9, the second connecting body 10, the suspended teeth A ₁ , suspension teeth B _l , radial air gap 20 , rotor core 18 , radial air gap 20 , suspension teeth _{Ar , suspension teeth B r ,} first connecting body 9 , second connecting body 10 , back to permanent magnet E _x 5, the S pole of the permanent magnet F _x 6.

The X-direction radial control magnetic flux 22 generated by the radial control windings 17 wound on the suspension teeth A ₁ 101, B ₁ 102, A _r 401 and B _r 402 respectively passes through the left X stator iron core. 1. Right X stator core 4 yoke, suspended teeth A _l , suspended teeth B _l and suspended teeth _Ar , suspended teeth _Br and rotor core 18 form a closed loop. The Y-direction radial control magnetic flux 23 generated by the radial control windings wound on the suspension teeth C _l 201, the suspension teeth D _l 202, the suspension teeth C _r 301, and the suspension teeth D _r 302 passes through the left Y stator iron core respectively. 2. The yoke of the right Y stator core 3, the suspension teeth C _l , the suspension teeth D _l and the suspension teeth _{Cr , the suspension teeth D r and} the rotor core 18 form a closed loop.

Suspension principle: The static bias magnetic flux 21 interacts with the radial control magnetic flux 22 in the X direction and the radial control magnetic flux 23 in the Y direction, so that the superposition of the air gap magnetic field on the same side as the radial eccentric direction of the rotor is weakened, while the opposite direction The superposition of the air-gap magnetic field increases, creating a force on the rotor in the opposite direction of the rotor deflection, pulling the rotor back to the radial equilibrium position.

The technical means disclosed by the solution of the present invention are not limited to the technical means disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims (6)

1. a new structure same-polarity four-pole magnetic bearing, comprising a stator and a rotor positioned at the inner ring of the stator, characterized in that the stator is an axially symmetrical structure, comprising a left X stator core arranged in turn from left to right , left Y stator iron core, right X stator iron core, right Y stator iron core; the rotor includes a rotor iron core and a rotating shaft, and the rotating shaft runs through the rotor iron core; The left and right X stator cores are respectively connected through a pair of connectors inserted with permanent magnets, and the left and right Y stator cores are respectively connected through another pair of connectors inserted with permanent magnets of the same structure; the four permanent magnets are: Axial magnetization, and its magnetization direction is the same; the left X stator core is evenly distributed along the inner circumference and a pair of suspended teeth are evenly distributed along the +x axis and the -x axis direction; the left Y stator core is along the inner circumference and A pair of suspended teeth are evenly distributed in the symmetrical positions of the +y axis and the -y axis; the right X stator iron core and the right Y stator iron core are provided with symmetrical positions on the left X stator iron core and the left Y stator iron core. the same suspension teeth; The suspension teeth are all zigzag structures. The four suspension teeth on the left X stator iron core and the left Y stator iron core have the same axial width and radial coplanarity on one end face of the rotor iron core and are coplanar with the rotor. The radian of the circumferential surface of the iron core is matched; the four suspension teeth on the right X stator iron core and the right Y stator iron core are close to the axial width of one end face of the rotor iron core, are radially coplanar, and are coplanar with the circumferential surface of the rotor iron core The radians are matched; a radial air gap with the same air gap length is formed between the suspension teeth and the rotor core, and centralized radial control windings are wound on the suspension teeth. 2. The new structure same-polarity four-pole magnetic bearing according to claim 1, wherein the outer diameter of the left and right Y stator iron cores is smaller than the inner diameter of the left and right X stator iron cores, and the difference between the two is greater than two. radial air gap length. 3. The new structure same-polarity quadrupole magnetic bearing according to claim 1, characterized in that, the four connecting bodies are arc-shaped, and have the same radial dimension, and are located at the outer diameter and the left and right sides respectively. On the ring with the same outer diameter of the X stator iron core, the two ends of the inner surface of the pair of connecting bodies for connecting the left and right Y stator iron cores close to the center of the circle are respectively provided with termination parts, and the left Y stator The iron core is connected to the right Y stator iron core through 4 termination parts. 4. The same-polarity four-pole magnetic bearing of new structure according to claim 3, wherein the left X stator iron core, the left Y stator iron core, the right X stator iron core, the Y stator iron core, the connecting body , the termination part and the rotor core are made of magnetically conductive material. 5 . The new structure homopolar quadrupole magnetic bearing according to claim 1 , wherein the permanent magnet is made of rare earth permanent magnet material. 6 . 6 . The new structure homopolar quadrupole magnetic bearing according to claim 1 , wherein the rotating shaft is made of non-magnetic conductive material. 7 .

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