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a magnetic bearing

A technology of magnetic bearings and rotating shafts, applied in the field of magnetic bearings, can solve the problems of non-adjustable permanent magnet bias flux, little improvement in inherent stiffness, and high difficulty in manufacturing and assembly, so as to improve levitation accuracy, reduce control difficulty, and high inherent stiffness Effect

Active Publication Date: 2020-11-10
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the permanent magnet bias flux of traditional hybrid magnetic bearings cannot be adjusted, and the synthetic flux can only be adjusted by controlling the levitation control flux, so there is little improvement in inherent stiffness, low critical speed, difficult design and manufacturing assembly Difficult questions

Method used

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Experimental program
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Effect test

Embodiment 1

[0043] Such as figure 1 As shown, the magnetic bearing provided by the embodiment of the present invention includes an annular magnetic yoke 5, a first radial stator 1 disposed inside the annular magnetic yoke 5, a second radial stator 2, an axial stator 14, a radial offset Coil 7 , shaft / radial levitation coil 6 , rotor 3 and shaft 4 .

[0044] The rotor 3 is a hollow cylindrical structure and is sheathed on the rotating shaft 4 . The first radial stator 1 is annular and coaxially arranged with the annular magnetic permeable yoke 5 , the rotor 3 and the rotating shaft 4 .

[0045]The second radial stator 2 is arranged in the first radial stator 1. Specifically, the first radial stator 1 extends radially inwards with eight first radial teeth 1a; two adjacent first radial teeth 1a Teeth 1a form an open fan-shaped slot, including 4 large slots and 4 small slots, the large slots and small slots are alternately distributed, the axis of one pair of large slots is in the horizonta...

Embodiment 2

[0063] Such as Figure 4 As shown, it is a three-dimensional structural schematic diagram of the magnetic bearing provided by the embodiment of the present invention. The structural difference from the first embodiment is that a permanent magnet 12 is provided between the first radial stator 1 and the annular magnetic permeable yoke 5, And the permanent magnet 12 is closely arranged with the first radial stator 1 and the annular magnetic yoke; the radial suspension coil 6 is wound on the first compound tooth, and the radial suspension coil 6 on the two second radial stators 2 opposite connected in series to form two radial suspension windings; the first wide tooth 9 is wound with a radial bias coil 7, and all the radial bias coils 7 are connected in series to form a radial bias winding.

[0064] The permanent magnets 12 are provided with four pieces, which are evenly distributed along the circumferential direction. The adjacent permanent magnets 12 have a space difference of 9...

Embodiment 3

[0076] Such as Figure 7 As shown, it is a three-dimensional structural schematic diagram of the magnetic bearing provided by the embodiment of the present invention. The structural difference from the second embodiment is that the permanent magnet 12 is arranged in the small groove and closely cooperates with the adjacent first narrow teeth 10. , the height of the permanent magnet 12 is smaller than the height of the first radial tooth 1 a;

[0077] The permanent magnet 12 produces a constant permanent magnet bias flux. When the radial bias winding applies DC excitation, an electromagnetic bias flux will also be generated in the magnetic bearing. By adjusting the current in the radial bias winding, The electromagnetic bias flux can be adjusted, so that the synthetic bias flux of the magnetic bearing is also adjustable; in order to avoid the magnetic circuit conflict between the permanent magnet bias flux and the electromagnetic bias flux and to enhance the two biases For the...

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Abstract

The invention discloses a magnetic bearing. The magnetic bearing comprises a rotating shaft, a rotor, a first radial stator and a second radial stator, wherein the second radial stator is evenly distributed between the first radial stator and the rotor in the circumferential direction; the first radial stator is provided with eight first radial teeth extending radially inwards, two first radial teeth forms one pair, and a total of four second radial stator mounting grooves are formed; non-magnetic conductive materials fill the space between the second radial stator and the first radial statorand the space between the second radial stator and the first radial teeth; and the second radial stator comprises one first wide tooth and two first narrow teeth, and the two first narrow teeth are symmetrically distributed on the two sides of the first wide tooth. The magnetic bearing has the advantages of high integration level, good decoupling performance, convenient adjustment of bias magnetic flux and the like.

Description

technical field [0001] The invention relates to a magnetic bearing and belongs to the technical field of bearings. Background technique [0002] Magnetic suspension bearings have excellent characteristics such as no friction, no wear, no need for seal lubrication, high speed, high precision, long life and low maintenance cost, which can effectively solve the bearing support problem of high-speed motors. According to whether the levitation force can be actively controlled, magnetic bearings can generally be divided into two types: passive type and active type. Active magnetic bearings can realize the suspension of the rotating shaft by controlling the electromagnetic force between the stator and the rotor, and are widely used in the field of high-speed motors. According to the method of establishing the bias magnetic field, active magnetic bearings can be divided into electromagnetic type and hybrid type. The bias flux of hybrid magnetic bearings is generated by permanent m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C32/04
CPCF16C32/044F16C32/0459
Inventor 刘泽远张腾飞陈轶涵郭鸿浩巩飞
Owner NANJING UNIV OF POSTS & TELECOMM
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