Five-degree-of-freedom outer rotor permanent magnet bias spherical magnetic bearing

Abstract

The invention discloses a five-degree-of-freedom outer rotor permanent magnet bias spherical magnetic bearing. The five-degree-of-freedom outer rotor permanent magnet bias spherical magnetic bearing comprises a spherical rotor. Two stators and a permanent magnet are arranged in the center in the rotor. The upper stator and the lower stator are located on the upper side and the lower side of the permanent magnet in a mirror symmetry manner. The upper stator and the lower stator are the same in structure and are in a semispherical shape, and the permanent magnet is cylindrical. An upper axial groove is formed in the outer surface of the upper stator at every 90-degree internal in the circumferential direction. An upper annular radial groove is formed in the outer surface of the axial middle of the upper stator in the circumferential direction. The upper annular radial groove and the four upper axial grooves are through and intersect with one another, and four stator magnetic poles are formed in an upper-lower layer manner. The lower stator is also provided with four lower axial grooves and a lower annular radial groove, and four stator magnetic poles of the lower stator are formed in an upper-lower layer manner, and a control coil is wound around each magnetic pole; and the control current of the magnetic bearing can be reduced, the power amplifier loss is lowered, and the size of the magnetic bearings is reduced.

Description

technical field [0001] The invention relates to a non-mechanical contact spherical magnetic bearing, in particular to a five-degree-of-freedom outer rotor permanent magnet bias spherical magnetic bearing, which can be used as a magnetic levitation gyroscope, a magnetic levitation molecular pump, a magnetic levitation momentum wheel, etc. requiring high-speed and high-precision control , non-contact suspension support for clean, pollution-free, and long-life mechanical equipment. Background technique [0002] Magnetic suspension bearings are divided into pure electromagnetic bearings and permanent magnetic bias hybrid magnetic bearings. The former uses bias current to generate a bias magnetic field, and uses the control magnetic field generated by the control current to adjust the magnitude of the electromagnetic force. It has two controllable magnetic fields. The latter utilizes a permanent magnet to provide a bias magnetic field, and an electromagnetic field to provide an a...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application number 201510029481.3 proposes an outer rotor spherical radial pure electromagnetic bearing, which uses a bias current to generate a bias magnetic field, which consumes a lot of power, is complex to control, and has insufficient degrees of freedom. Control the axial direction, so it is difficult to meet some special applications

When the inertial axis of the rotor deviates from the geometric axis, the magnitude of the electromagnetic force in each magnetic pole surface is not equal, and all of them do not exceed the center of mass, which will cause radial torsion interference torque to the rotor, forcing the rotor to drift and reducing the control accuracy of the rotor.

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