CN216951299U - A two-and-a-half-degree-of-freedom hybrid magnetic bearing - Google Patents

Abstract

The utility model discloses a hybrid magnetic bearing with two half degrees of freedom. The stator comprises a radial stator iron core, a permanent magnet and an axial stator iron core. The radial stator core has N control poles and N permanent magnet poles embedded with permanent magnets arranged at intervals along the circumference of the radial stator core, and radial control windings are wound on the N control poles; the inner side of the axial stator core is connected to the rotor core 2M arc-shaped control cores are distributed on the opposite part of the side; axial control windings are wound on each arc-shaped control core; the radial stator core and the axial stator core are connected by magnetic isolation materials; the rotor core is opposite to the radial stator core, And form radial air gaps with 2N magnetic poles, and form axial air gaps with 2M arc-shaped control cores. The two half-degree-of-freedom hybrid magnetic bearing of the utility model integrates the rotor radial air gap and the axial unilateral air gap adjustment function into one, the radial suspension force is large, and can be used in pairs to support the motor rotor with five degrees of freedom and stability Suspended.

Description

A two-and-a-half-degree-of-freedom hybrid magnetic bearing

technical field

The utility model relates to the technical field of bearing manufacturing, in particular to a two-half-degree-of-freedom hybrid magnetic bearing with adjustable rotor radial air gap and axial single-side air gap.

Background technique

The magnetic suspension motor is a special motor that uses the electromagnetic force generated by the magnetic bearing to support the motor rotor to achieve stable suspension. Since there is no mechanical contact between the stator and the rotor, the magnetic levitation motor can reach a high running speed, and has the advantages of no mechanical wear, low energy consumption, long life, no lubrication, no pollution, etc. It is especially suitable for high-speed or ultra-high speed applications. High-speed direct drive field.

At present, magnetic suspension bearings can be divided into: single-degree-of-freedom, two-degree-of-freedom, three-degree-of-freedom, and four-degree-of-freedom and five-degree-of-freedom magnetic bearings combined by the first three degrees of freedom, but for applications such as robots, it is necessary to control 2.5 degrees of freedom The degree of freedom suspension function is difficult to achieve with several current magnetic bearings.

Utility model content

Purpose of the utility model: Aiming at the problems existing in the prior art, the present utility model provides a hybrid magnetic bearing with two half degrees of freedom, which effectively reduces the length of the magnetic path, is small in size, low in power consumption, compact in structure, and has a high critical speed. The radial suspension force density is high.

Technical scheme: The utility model provides a hybrid magnetic bearing with two half degrees of freedom, including a stator and a rotor, the stator includes a radial stator iron core, a permanent magnet, and an axial stator iron core; There are 2N magnetic poles evenly distributed around the circumference, among which, N magnetic poles are control magnetic poles, and the remaining N magnetic poles are respectively embedded with the permanent magnet magnetic poles of the permanent magnet, and the N control magnetic poles are arranged at intervals from the N permanent magnetic poles; Radial control windings are wound on the control magnetic poles; 2M arc-shaped control cores are evenly distributed on the inner side of the axial stator core along the circumferential radial direction; axial control windings are wound on the arc-shaped control cores; The radial stator iron core and the axial stator iron core are connected by a magnetic isolation material; the rotor includes a rotor iron core and a rotating shaft, the rotor iron core is opposite to the radial stator iron core, and forms a radial air gap with 2N magnetic poles, and The arc-shaped control core forms an axial air gap.

Further, the circular arc length of the control magnetic pole is twice that of the permanent magnetic pole, the air-gap bias magnetic flux density under the control magnetic pole is B _s , and the bias magnetic flux density under the permanent magnetic pole is 2 B _s .

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

Further, taking N=3, the three radial control windings wound on the control magnetic poles are used for radial two-degree-of-freedom suspension control, and are connected as star windings.

Further, take M=1 or 2 or 3; the axial control windings wound on the arc-shaped control iron core of 2M blocks are used for the axial half-degree-of-freedom suspension control, and the opposite two windings are connected in series or in reverse. After being connected in parallel, it is connected in series or in parallel as a winding.

Further, the N permanent magnets are block-shaped structures, and the magnetization directions thereof are magnetization of the same polarity along the radial direction.

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

Beneficial effects:

The two-half-degree-of-freedom hybrid magnetic bearing mentioned in the utility model integrates the adjustable features of radial two-degree-of-freedom air gap and axial single-side air gap, realizes 2.5-degree-of-freedom suspension control, and has the advantages of small volume and short axial length. , the critical speed is high, and the magnetic circuit is short, the power consumption is low, the magnetic leakage is small, and the suspension force density is large. The radial part of the utility model controls the circular arc length of the magnetic pole twice as long as that of the permanent magnetic pole, thereby increasing the levitation force.

Description of drawings

1 is a structural diagram of a hybrid magnetic bearing with two half degrees of freedom of the present utility model;

Fig. 2 is a kind of suspended magnetic flux diagram from right side of a hybrid magnetic bearing with two half degrees of freedom of the present invention;

FIG. 3 is a diagram of a radially suspended magnetic flux of a hybrid magnetic bearing with two half degrees of freedom of the present invention.

Among them, 1- radial stator core, 2- permanent magnet, 3- axial stator core, 4- control magnetic pole, 5- permanent magnetic pole, 6- radial control winding, 7- control disc, 8- axial control Winding, 9-rotor core, 10-shaft, 11-radial air gap, 12-axial air gap, 13-bias magnetic flux, 14-radial suspension control magnetic flux, 15-axial suspension control magnetic flux, 16 - Magnetic isolation material.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in Figures 1-3, the present utility model discloses a hybrid magnetic bearing with two half degrees of freedom, including a stator and a rotor. The stator includes a radial stator core 1, a block permanent magnet 2, and an axial stator core 3. The radial stator core 1 evenly distributes 2N magnetic poles along its inner circumference, of which N are control magnetic poles 4, N are permanent magnetic poles 5 embedded with block permanent magnets 2, N control magnetic poles 4 and N permanent magnetic poles 5 is set at intervals, and N is usually 3 or 4. In this embodiment, N=4. Referring to FIG. 1 and FIG. 3 , radial control windings 6 are wound on the four control magnetic poles 4 . On the inner side of the axial stator core 3, 2M arc-shaped control cores 7 are evenly distributed along the circumference and radial direction. In this embodiment, M=2, and 4 arc-shaped control cores 7 are evenly distributed along the circumference. Axial control windings 8 are wound on 4 arc-shaped control iron cores 7, see FIG. 1 .

The radial stator core 1 and the axial stator core 3 are connected by a magnetic insulating material 16; the rotor includes a rotor core 9 and a rotating shaft 10, the rotating shaft 10 runs through the rotor core 9, and the rotor core 9 is opposite to the radial stator core 1, and is opposite to the 8 Each of the magnetic poles forms a radial air gap 11 , and forms an axial air gap 12 with the arc-shaped control iron core 7 , see FIG. 2 .

The circular arc length of the control pole 4 is twice that of the permanent magnet pole 5 , the air gap bias flux density under the control pole 4 is B _s , and the bias flux density under the permanent magnet pole 5 is 2 B _s .

The magnetization directions of the four block-shaped permanent magnets 2 are radial magnetization of the same polarity. In this embodiment, the four block-shaped permanent magnets 2 are magnetized in the direction of 45° to provide radial bias magnetic flux.

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

The axial control windings 8 wound on the 4 arc-shaped control iron cores 7 are used for axial half-degree-of-freedom suspension control. connected in series or in parallel as a winding.

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

The block permanent magnet 2 provides a bias magnetic flux 13 to the radial stator core 1. Referring to FIG. 3, the magnetic circuit of the bias magnetic flux 13 is: the magnetic flux starts from the N pole of the permanent magnet 2 and passes through the permanent magnetic poles 5, The yoke of the radial stator core 1 , the control magnetic pole 4 , the radial air gap 11 , the rotor core 9 , the radial air gap 11 , and the S pole of the return permanent magnet 2 .

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

The axial suspension control magnetic flux 15 generated by the energization of the axial control winding 8 has a magnetic circuit between the axial air gap 12 and the arc-shaped control core 7, and the side surface of the rotor core 9 forms a closed path.

Suspension principle: The static bias magnetic flux 13 interacts with the radial suspension control magnetic flux 14 in the radial 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 superposition of the air gap magnetic field in the opposite direction is enhanced. A force in the opposite direction to the rotor deflection is generated on the rotor, pulling the rotor back to the radial equilibrium position. The axial direction is controlled by the axial suspension control magnetic flux 15. When the rotor moves in the reverse direction by the disturbance force, the axial air gap 12 becomes larger. At this time, the axial control winding 8 is passed into the control current to generate the control magnetic flux, and the rotor is moved in the opposite direction. Pull back to the original position.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present utility model, and the purpose thereof is to enable those who are familiar with the technology to understand the contents of the present utility model and implement them accordingly, and cannot limit the protection scope of the present utility model with this. All equivalent transformations or modifications made according to the spirit of the present invention shall be covered within the protection scope of the present invention.

Claims (7)

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.

Images