Permanent magnet biased radial magnetic bearing

Abstract

The invention relates to a permanent magnet biased radial magnetic bearing which comprises a rotor module and a stator module, the rotor module is arranged on the inner side of the stator module and has a radial direction and an axial direction, and the stator module comprises a radial stator, two first annular permanent magnets and two first annular soft irons; a first annular permanent magnet and a first annular soft iron are respectively arranged on the radial stator in sequence, and the two first annular permanent magnets and the two first annular soft irons are respectively symmetrical about the radial direction; the rotor module comprises two second annular permanent magnets, two second annular outer soft irons and second annular inner soft irons, the two second annular outer soft irons are arranged on the two sides of the second annular inner soft irons in the axial direction, and the second annular permanent magnets are arranged between the two second annular outer soft irons and the second annular inner soft irons; and the second annular permanent magnets and the first annular permanent magnets are oppositely arranged in the radial direction and are opposite in magnetizingdirection, the second annular outer soft irons and the first annular soft iron are oppositely arranged in the radial direction, the structure is simple and compact, and microminiaturization is easy.

Description

technical field [0001] The invention relates to the technical field of magnetic bearings, in particular to a permanent magnetic bias radial magnetic bearing. Background technique [0002] In the field of magnetic bearing technology, magnetic bearings are also called magnetic suspension bearings, which use magnetic force to suspend the rotor in the air so that there is no mechanical contact between the rotor and the stator. Compared with traditional rolling bearings, sliding bearings and oil film bearings, magnetic bearings have the advantages of low noise, long life, no lubrication, no oil pollution, etc., especially suitable for high-speed, vacuum, ultra-clean and other special environments, and in miniaturization Afterwards, it can be applied to applications such as implanted left ventricular auxiliary centrifugal blood pump (artificial heart), medical endoscope, micropump, and microlaser scanner. [0003] At present, magnetic bearings can be divided into two types accord...

AI Technical Summary

Problems solved by technology

[0003] At present, magnetic bearings can be divided into two types according to the source of the bias magnetic field: the first type is active magnetic bearing, which provides a bias magnetic field by setting a magnetic bearing coil and applying a bias current in the magnetic bearing coil, but the volume of this magnetic bearing , weight and power consumption are relatively large, not suitable for miniaturization

The second type is the permanent magnet bias magnetic bearing, which generates a bias magnetic field by setting a permanent magnet, and the permanent magnet bias magnetic bearing can be roughly divided into two types according to the integration degree of the control module: the first is in the axial and The radial direction realizes five-degree-of-freedom support through an independent magnetic bearing module, but this design method makes the axial dimension of the entire permanent magnet bias magnetic bearing longer and the system complexity is higher; the second is to combine the radial and axial The magnetic bearing modules are integrated together, but this design leads to complex rotor structure design, large stator radial size, low axial and roll passive control stiffness, or even close to no passive control stiffness, resulting in permanent magnet bias magnetic bearings. Large power consumption, not suitable for miniaturization

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