CN216951299U

CN216951299U - Two-half-degree-of-freedom hybrid magnetic bearing

Info

Publication number: CN216951299U
Application number: CN202123401182.8U
Authority: CN
Inventors: 王紫欣; 张涛; 田涛; 郭凯铭; 殷辉; 丁卫红; 陈亚娟; 李华
Original assignee: Huaiyin Institute of Technology
Current assignee: Huai'an Cike Intelligent Transmission Equipment Co ltd; Huaiyin Institute of Technology
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-07-12
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a two-half-degree-of-freedom hybrid magnetic bearing. The radial stator core is circumferentially provided with N control magnetic poles arranged at intervals and N permanent magnetic poles embedded with permanent magnets, and radial control windings are wound on the N control magnetic poles; 2M arc control iron cores are distributed on the inner side surface of the axial stator iron core and the part of the inner side surface of the axial stator iron core, which is opposite to the side surface of the rotor iron core; an axial control winding is wound on each arc-shaped control iron core; the radial stator core is connected with the axial stator core through a magnetism isolating material; the rotor iron core is opposite to the radial stator iron core, radial air gaps are formed between the rotor iron core and the 2N magnetic poles, and axial air gaps are formed between the rotor iron core and the 2M arc-shaped control iron cores. The two half-freedom hybrid magnetic bearings integrate the functions of adjusting the radial air gap and the axial single-side air gap of the rotor into a whole, have large radial suspension force, and can be applied to five-freedom stable suspension of the rotor of the supporting motor in pairs.

Description

Two-half-degree-of-freedom hybrid magnetic bearing

Technical Field

The utility model relates to the technical field of bearing manufacturing, in particular to a hybrid magnetic bearing integrating two half-degrees-of-freedom with adjustable radial air gaps and axial unilateral air gaps of a rotor.

Background

The magnetic suspension motor is a special motor which utilizes the electromagnetic force generated by the magnetic bearing to support the motor rotor to realize stable suspension. Because the stator and the rotor do not have mechanical contact, the magnetic suspension motor can reach high running speed, has the advantages of no mechanical abrasion, low energy consumption, long service life, no need of lubrication, no pollution and the like, and is particularly suitable for being applied to the field of high-speed or ultrahigh-speed direct driving.

At present, magnetic suspension bearings can be divided into the following parts according to the degree of freedom: the magnetic bearing has single degree of freedom, two degrees of freedom, three degrees of freedom, and four degrees of freedom and five degrees of freedom combined by the three, but the magnetic bearing needs to control the suspension function of 2.5 degrees of freedom in the application fields such as robots, and the like, and the magnetic bearings are difficult to realize at present.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: aiming at the problems in the prior art, the utility model provides a two-half-degree-of-freedom hybrid magnetic bearing which effectively reduces the length of a magnetic circuit, and has the advantages of small volume, low power consumption, compact structure, high critical rotating speed and large radial suspension force density.

The technical scheme is as follows: the utility model provides a two-half-degree-of-freedom hybrid magnetic bearing, which comprises a stator and a rotor, wherein the stator comprises a radial stator core, a permanent magnet and an axial stator core; 2N magnetic poles are uniformly distributed on the radial stator core along the inner circumference of the radial stator core, wherein the N magnetic poles are control magnetic poles, the rest N magnetic poles are permanent magnetic poles in which the permanent magnets are respectively embedded, and the N control magnetic poles and the N permanent magnetic poles are arranged at intervals; radial control windings are wound on the N control magnetic poles; 2M arc-shaped control iron cores are uniformly distributed on the inner side surface of the axial stator iron core along the circumferential radial direction; axial control windings are wound on the arc-shaped control iron cores; the radial stator core is connected with the axial stator core through a magnetism isolating material; the rotor comprises a rotor iron core and a rotating shaft, wherein the rotor iron core is opposite to the radial stator iron core, a radial air gap is formed between the rotor iron core and the 2N magnetic poles, and an axial air gap is formed between the rotor iron core and the arc-shaped control iron core.

Furthermore, the circumferential arc length of the control magnetic pole is twice that of the permanent magnetic pole, and the air gap bias magnetic flux density under the control magnetic pole isB _sThen the bias flux density under the permanent magnet pole is 2B _s。

Further, N =4, 4 radial control windings wound on the control magnetic poles are used for controlling two degrees of freedom of radial suspension, and opposite two-pole windings are reversely connected in series or in parallel.

Further, N =3, 3 radial control windings wound on the control magnetic poles are used for radial two-degree-of-freedom suspension control and are connected to form a star winding.

Further, take M =1 or 2 or 3; and 2M axial control windings wound on the arc control iron core are used for axial half-freedom suspension control, and are connected in series or in parallel after two opposite windings are connected in series or in parallel in an opposite direction to form one winding.

Furthermore, the N permanent magnets are of block structures, and the magnetizing directions of the permanent magnets are the same polarity along the radial direction.

Furthermore, the radial stator iron core, the axial stator iron core and the rotor iron core are all made of materials with magnetic conductivity, and the permanent magnets are all made of rare earth permanent magnet materials.

Has the advantages that:

the two half-freedom hybrid magnetic bearings provided by the utility model have the characteristics of adjustable radial two-freedom-degree air gaps and axial single-side air gaps, realize 2.5-freedom-degree suspension control, and have the characteristics of small volume, short axial length, high critical rotating speed, short magnetic circuit, low power consumption, small magnetic leakage and high suspension force density. The radial part of the utility model controls the arc length of the magnetic pole circumference to be twice of the permanent magnetic pole, thus increasing the suspension force.

Drawings

FIG. 1 is a schematic diagram of a two half-degree-of-freedom hybrid magnetic bearing of the present invention;

FIG. 2 is a right-view suspension magnetic flux diagram of a two-half-freedom hybrid magnetic bearing according to the present invention;

fig. 3 is a radial suspension magnetic flux diagram of a two-half-degree-of-freedom hybrid magnetic bearing according to the present invention.

The magnetic separation device comprises a radial stator core 1, a radial stator core 2, a permanent magnet 3, an axial stator core 4, a control magnetic pole 5, a permanent magnet magnetic pole 6, a radial control winding 7, a control disc 8, an axial control winding 9, a rotor core 10, a rotating shaft 11, a radial air gap 12, an axial air gap 13, a bias magnetic flux 14, a radial suspension control magnetic flux 15, an axial suspension control magnetic flux 16 and a magnetic separation material 16.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The utility model discloses a two-half-degree-of-freedom hybrid magnetic bearing, which comprises a stator and a rotor, wherein the stator comprises a radial stator iron core 1, a blocky permanent magnet 2 and an axial stator iron core 3. The radial stator core 1 is evenly distributed with 2N magnetic poles along its inner circumference, wherein N are control magnetic poles 4, N are permanent magnetic poles 5 embedded in the massive permanent magnet 2, the N control magnetic poles 4 and the N permanent magnetic poles 5 are arranged at intervals, N is usually 3 or 4, in this embodiment, N =4 is taken, refer to fig. 1 and fig. 3, and radial control windings 6 are wound on the 4 control magnetic poles 4. The inner side surface of the axial stator core 3 is uniformly distributed with 2M arc control cores 7 along the circumferential radial direction, and in the present embodiment, M =2 and 4 arc control cores 7 are uniformly distributed along the circumference. An axial control winding 8 is wound on the 4 arc-shaped control iron cores 7, see the attached figure 1.

The radial stator core 1 is connected with the axial stator core 3 through a magnetism isolating material 16; the rotor comprises a rotor core 9 and a rotating shaft 10, the rotating shaft 10 penetrates through the rotor core 9, the rotor core 9 is opposite to the radial stator core 1, a radial air gap 11 is formed between the rotor core 9 and each radial stator core and each 8 magnetic poles, and an axial air gap 12 is formed between the rotor core and each arc-shaped control core 7, and the reference of the attached drawing is 2.

The arc length of the circumference of the control magnetic pole 4 is twice of that of the permanent magnetic pole 5, and the air gap bias magnetic flux density under the control magnetic pole 4 isB _sThe bias flux density under the permanent magnetic pole 5 is 2B _s。

The magnetizing directions of the 4 block-shaped permanent magnets 2 are radial same-polarity magnetizing, and in the embodiment, the 4 block-shaped permanent magnets 2 are all magnetized in 45-degree directions to provide radial bias magnetic flux.

The radial control windings 6 wound on the 4 control magnetic poles 4 are used for radial two-degree-of-freedom suspension control, and opposite radial two-pole windings are connected in series or in parallel in an opposite direction.

The axial control windings 8 wound on the 4 arc-shaped control iron cores 7 are used for axial half-freedom-degree suspension control, opposite two-pole windings are reversely connected in series or in parallel, and after the opposite radial two-pole windings are reversely connected in series or in parallel, the two-pole windings are connected in series or in parallel to form one winding.

The radial stator core 1, the axial stator core 3 and the rotor core 9 are all made of materials with magnetic conductivity. The massive permanent magnets 2 are all made of rare earth permanent magnet materials.

The block permanent magnet 2 provides bias magnetic flux 13 for the radial stator core 1, and referring to fig. 3, the magnetic path of the bias magnetic flux 13 is as follows: the magnetic flux starts from the N pole of the permanent magnet 2, passes through the permanent magnet pole 5, the yoke part of the radial stator core 1, the control pole 4, the radial air gap 11, the rotor core 9, the radial air gap 11, and returns to the S pole of the permanent magnet 2.

The radial suspension control magnetic flux 14 generated by electrifying the radial control winding 6 has a magnetic circuit as follows: the control magnetic poles 4, the radial stator core 1 yoke portion, the radial air gap 11, and the rotor core 9 form a closed path.

The axial control winding 8 is electrified to generate an axial suspension control magnetic flux 15, the magnetic path of the axial suspension control magnetic flux is between the axial air gap 12 and the arc-shaped control iron core 7, and the side surface of the rotor iron core 9 forms a closed path.

Suspension principle: the static bias magnetic flux 13 and the radial suspension control magnetic flux 14 in the radial direction interact with each other, so that the air gap magnetic field superposition on the same side with the radial eccentricity direction of the rotor is weakened, the air gap magnetic field superposition on the opposite direction is strengthened, and a force opposite to the offset direction of the rotor is generated on the rotor to pull the rotor back to the radial balance position. The axial direction is acted by an axial suspension control magnetic flux 15, when the rotor moves reversely by disturbance force, the axial air gap 12 is enlarged, at the moment, the axial control winding 8 is led in control current to generate a control magnetic flux, and the rotor is pulled back to the original position.

The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. A two-half-degree-of-freedom hybrid magnetic bearing comprises a stator and a rotor, and is characterized in that the stator comprises a radial stator core (1), a permanent magnet (2) and an axial stator core (3); 2N magnetic poles are uniformly distributed on the radial stator core (1) along the inner circumference of the radial stator core, wherein the N magnetic poles are control magnetic poles (4), the rest N magnetic poles are permanent magnetic poles (5) embedded into the permanent magnet (2), and the N control magnetic poles (4) and the N permanent magnetic poles (5) are arranged at intervals; radial control windings (6) are wound on the N control magnetic poles (4); 2M arc-shaped control iron cores (7) are uniformly distributed on the inner side surface of the axial stator iron core (3) along the circumferential radial direction; axial control windings (8) are wound on the arc-shaped control iron cores (7); the radial stator core (1) is connected with the axial stator core (3) through a magnetic isolation material (16); the rotor comprises a rotor iron core (9) and a rotating shaft (10), wherein the rotor iron core (9) is opposite to the radial stator iron core (1), a radial air gap (11) is formed between the rotor iron core and 2N magnetic poles, and an axial air gap (12) is formed between the rotor iron core and the arc control iron core (7).

2. The two half degree of freedom hybrid magnetic bearing of claim 1, wherein the control pole (4) has twice the circumferential arc length than the permanent magnet pole (5), and the air gap bias flux density under the control pole (4) isB _sThe bias flux density under the permanent magnetic pole (5) is 2B _s。

3. The two half-degree-of-freedom hybrid magnetic bearing according to claim 1, wherein taking N =4, 4 radial control windings (6) wound on the control poles (4) for radial suspension two-degree-of-freedom control, opposite two pole windings are connected in anti-series or in parallel.

4. The two half-degree-of-freedom hybrid magnetic bearing according to claim 1, wherein N =3, 3 radial control windings (6) wound on the control poles (4) are taken for radial two-degree-of-freedom suspension control and connected as a star winding.

5. The two half-degree-of-freedom hybrid magnetic bearing of claim 1, wherein taking M =1 or 2 or 3; and 2M axial control windings (8) wound on the arc-shaped control iron core (7) are used for axial half-freedom suspension control, and are connected in series or in parallel after two opposite windings are connected in series or in parallel in the opposite direction to form one winding.

6. The two half-degree-of-freedom hybrid magnetic bearings according to claim 1, wherein the N permanent magnets (2) are block-shaped structures with the magnetization direction being radial homopolar magnetization.

7. The two half-degree-of-freedom hybrid magnetic bearings according to claim 1, wherein the radial stator core (1), the axial stator core (3) and the rotor core (9) are made of materials with magnetic permeability, and the permanent magnets (2) are made of rare earth permanent magnet materials.