Three magnetic pole permanent magnetism bias radial direction magnetic bearing

Abstract

A permanent magnetic offset radial magnetic bearing with three magnetic poles, belonging to mixed magnetic bearing in the magnetic bearings, comprises a radial stator (1), a control winding (2), a cirque permanent magnet (5) radially filled with magnet, an exterior magnetic pole iron center (6) and a rotor (3) sleeved with a rotor iron center (4). The permanent magnetic offset radial magnetic bearing utilizes the cirque permanent magnet radially filled with the magnet to establish a static offset magnetic field; an enclosed magnetic path is formed by the exterior magnetic pole iron center, the rotor iron center and the radial stator; the radial control winding with three magnetic poles produces a control flux to be coincident with an offset flux; radial suspension with two degrees of freedom is implemented by the three / two commutation principle of an AC motor; with the advantages of simple structure, small volume, light weight, low power consumption and small axial space occupied, the invention has wide applicable prospects in the high-speed applicable sites such as flywheel energy storage, air conditioner compressor, turbomolecular pump, etc.

Description

1. Technical field [0001] The three-pole permanent magnetic bias radial magnetic bearing of the invention belongs to the hybrid magnetic bearing in the magnetic bearing. 2. Background technology [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 provided: The fi...

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Problems solved by technology

[0004] At present, the structure forms of permanent magnet bias radial magnetic bearings researched internationally are divided into heteropolar and homopolar structures. The axial length of heteropolar structures can be made shorter, but hysteresis loss will occur, while homopolar structures The hysteresis loss of the magnetic bearing with the structure is greatly reduced, but the structure of the ordinary magnetic bearing with the same polarity is more complex, the required control windings are more, the power consumption is large, and the axial space occupied is larger, which is not conducive to the improvement of the critical speed of the rotor.

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