Permanent magnet biased axial hybrid magnetic bearing

Abstract

The present invention discloses a permanent magnet biased axial hybrid magnetic bearing, which comprises two stator discs having the same structure, wherein the two stator discs are arranged relative to a suction disc in an axially symmetric manner, the disc surface of every stator disc is provided with an outer annular coil groove, two annular magnetic isolation ring grooves, an annular permanent magnet groove and an inner annular coil groove along a radial direction from outside to inside, the two annular magnetic isolation ring grooves are respectively positioned on both radial sides of the annular permanent magnet groove, control coils are arranged inside every inner annular coil groove and every outer annular coil groove, a magnetic isolation ring is intercalated inside each annular magnetic isolation ring groove, an annular permanent magnet is pressed into each annular permanent magnet groove, and every annular permanent magnet is radially magnetized. According to the present invention, a static bias magnetic field is generated by the permanent magnet material so as to reduce magnetic bearing volume, lower power amplifier power consumption, and improve carrying capacity of the magnetic bearing; and the annular permanent magnet is embedded in the middle of the stator disc so as to ensure suction disc stiffness and upper-lower symmetry and left-right equality of the provided bias magnetic field.

Description

technical field [0001] The invention relates to a non-mechanical contact magnetic bearing, in particular to a permanent magnet bias axial hybrid magnetic bearing, which is suitable for mechanical equipment such as five-degree-of-freedom magnetic bearing systems, axial positioning of bearingless motors, and high-speed flywheel energy storage systems. Axial non-contact suspension support of rotating parts. Background technique [0002] Since the rapid development of magnetic bearing technology in the 1970s, since the bias magnetic field of the hybrid magnetic suspension bearing is generated by the permanent magnetic material, the electromagnetic coil only generates the control magnetic field, which has the advantages of low power consumption and small size, and has become a research hotspot. . The technology of radial hybrid magnetic bearings has become mature, but the technology of single-degree-of-freedom axial hybrid magnetic bearings is still rare, especially the design o...

AI Technical Summary

Problems solved by technology

[0003] Chinese Patent Publication No. CN101038011, named "three-degree-of-freedom AC hybrid magnetic bearing", combines radial two-degree-of-freedom and axial single-degree-of-freedom, and has the advantages of high integration and small volume, but its defects are: radial There is a coupling between the force and the axial force, which increases the difficulty of the control system

Chinese Patent Publication No. CN101025198, titled "A Permanent Magnet Bias Axial Hybrid Magnetic Bearing" is an axial single-degree-of-freedom magnetic suspension bearing, which only uses a radially magnetized circular permanent magnet. Simple, the axial control windings are located on both sides of the radial stator, which increases the axial length of the magnetic bearing and reduces the critical speed of the suspended rotor

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