Heteropolar permanent magnet bias mixing radial magnetic bearing

Abstract

The invention discloses a heteropolar permanent magnet bias mixing radial magnetic bearing and belongs to the field of a magnetic bearing. The heteropolar permanent magnet bias mixing radial magnetic bearing comprises a stator core, a rotor core, a control coil, a spindle and permanent magnets, wherein the rotor core is arranged in the middle of the stator core; the stator core has four stator poles which can be rotated relative to the stator core; a working air gap is arranged between the stator core and the rotor core; a plurality of permanent magnets are symmetrically embedded between two adjacent teeth of the stator core; the spindle is arranged in the middle of the rotor core and is capable of rotating following the rotor core; control windings are wound on the stator poles, and two control windings along X and Y directions are serially connected with each other; the tail ends of the stator teeth on the stator core extend and are connected with the permanent magnets; auxiliary air gaps are formed on the stator teeth along X directions, so that the magnetic flux generated by the permanent magnets cannot be short-circuited by the stator core; and an air-gap bias magnetic field is formed in the working air gap. The heteropolar permanent magnet bias mixing radial magnetic bearing is low in core loss and is high in system running reliability.

Description

technical field [0001] The invention belongs to the technical field of magnetic suspension bearings, and more specifically relates to a heteropolar permanent magnet bias hybrid radial magnetic bearing with low rotor loss. Background technique [0002] With the rapid development of modern industry, high-speed and ultra-high-speed motors are increasingly widely used. However, as the motor speed increases, the requirements for bearing performance are getting higher and higher, and traditional mechanical bearings can no longer meet their needs. In contrast, magnetic bearings have very broad application prospects in vacuum, ultra-clean, ultra-high speed and other occasions due to their advantages of no friction and wear, high rotor displacement accuracy, high supportable speed, no need for lubricating oil, and long life. also received increasing attention. [0003] According to the way the magnetic force is provided, magnetic bearings can generally be divided into three categor...

AI Technical Summary

Problems solved by technology

However, due to the different magnetic polarities generated by the permanent magnets on the stator poles, the rotor will generate a large core loss under high-speed operation, which is not conducive to the heat dissipation of the rotor, thus limiting its application in vacuum, ultra-high speed and other occasions

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