A Novel Permanent Magnetic Bias Axial Magnetic Suspension Bearing

Abstract

The invention discloses a novel permanent magnet biased axial magnetic levitation bearing. The novel permanent magnet biased axial magnetic levitation bearing comprises a stator sleeve A, a stator sleeve B, a permanent magnet ring, a stator circular disc A, a stator circular disc B, a stator circular disc C, a stator circular disc D, a control winding A, a control winding B, a main shaft and a rotor iron core, wherein the permanent magnet ring is arranged between the stator sleeve A and the stator sleeve B and is used for connecting the stator sleeve A and the stator sleeve B; the section thicknesses of the stator sleeve A, the stator sleeve B and the permanent magnet ring are equal; the stator circular disc A and the stator circular disc B are arranged at two ends of the inner wall of the stator sleeve A respectively; the control winding A is arranged between the stator circular disc A and the stator circular disc B; the stator circular disc C and the stator circular disc D are arranged at two ends of the inner wall of the stator sleeve B respectively; the control winding B is arranged between the stator circular disc C and the stator circular disc D.

Description

technical field [0001] The invention relates to a magnetic suspension bearing, in particular to a novel permanent magnetic bias axial magnetic suspension bearing, belonging to the technical field of magnetic suspension. Background technique [0002] As early as 1842, British physicist Earnshaw conducted research and discussion on magnetic suspension bearing technology. The basic principle of magnetic suspension bearing technology is to use the magnetic field force between the stator core and the rotor core to realize the non-contact support of the rotating shaft. Since there is no mechanical contact between the stator and rotor, magnetic bearings have the following advantages: [0003] 1. Can withstand extremely high speed. The rotating shaft supported by magnetic suspension bearings can operate under supercritical conditions of hundreds of thousands of revolutions per minute, and its peripheral speed is only limited by the strength of the rotating shaft material. Generall...

AI Technical Summary

Problems solved by technology

[0012] 1. A permanent magnet bias axial magnetic bearing given in Chinese Patent Application No. 200510011272.2 has large magnetic flux leakage and low utilization rate;

[0013] 2. Chinese patent application number 200910030777.1 provides a hybrid axial magnetic bearing with permanent magnets located on the rotor. There is a large difference between the inner and outer axial stator magnetic poles and radii, resulting in a large difference in the magnetic flux leakage coefficient, and it is difficult to ensure the axial air gap. The bias magnetic field is the same;

[0014] 3. Chinese patent application No. 200710098751.1 provides a low-power axial magnetic bearing with redundant structure, which has large magnetic flux leakage and low utilization rate;

[0015] 4. A new type of permanent magnet bias axial magnetic suspension bearing given in Chinese Patent Application No. 201120216533.5 has a complex structure, large volume and high energy consumption

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