Permanent magnet biased axial magnetic bearing

Abstract

The invention discloses a permanent magnet biased axial magnetic bearing, which belongs to the technical field of magnetic bearings. The permanent magnet biased axial magnetic bearing comprises a stator component and a rotor component, wherein the stator component comprises an axial stator, an axial control winding, a permanent magnet and a radial stator; the rotor component comprises a rotating shaft and a rotor iron core; the axial control winding is wound on a magnetic pole of the axial stator; the rotor iron core is sleeved on the rotating shaft; the radial stator is arranged in the axial stator; the permanent magnet is attached to the outer end of the radial stator and contacts the inner end face of the axial stator; the rotor iron core is arranged in the axial stator and the radial stator and is disc-shaped; the center of a disc is sleeved on the rotating shaft; the radial stator is arranged at two ends of the disc; and the axial stator is arranged at the outer end of the disc. The permanent magnet biased axial magnetic bearing has a simple structure, high critical speed of rotation and low power consumption; axial air gaps of the bearing can be arranged dissymmetrically to generate a stable passive suspension force; and the permanent magnet biased axial magnetic bearing can greatly reduce the suspension power consumption of the magnetic bearing when used in a vertically placed flywheel energy storage device.

Description

technical field [0001] The invention relates to a hybrid magnetic bearing in the technical field of magnetic bearings, in particular to a permanent magnetic bias axial magnetic bearing. Background technique [0002] Magnetic suspension bearing, also referred to as magnetic bearing for short, is a new type of high-performance bearing that uses the magnetic force between the stator and the rotor to suspend the rotor in space, so that there is no mechanical contact between the stator and the rotor. Because there is no mechanical contact between the stator and the rotor, the rotor of the magnetic suspension bearing can reach a high operating speed, and has the advantages of small mechanical wear, low energy consumption, long life, no lubrication, no pollution, etc., especially suitable for high speed , vacuum and ultra-clean and other special applications. [0003] At present, magnetic bearings are divided into the following types according to the way the magnetic force is prov...

AI Technical Summary

Problems solved by technology

[0004] At present, there are three structural forms of permanent magnet bias axial magnetic bearings researched internationally. One is to place permanent magnets in the rotor, which increases the difficulty of installation and limits its high-speed operation; the second type of magnetic bearing suspends the rotor. Placed on both sides of the stator, the axial length is long and the critical speed is low; in the third type of magnetic bearing, the axial control magnetic flux passes through the permanent magnet, which has an obvious demagnetization effect on the permanent magnet, and the magnetic flux leakage is large. Efficient applications are limited

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