Axial magnetic bearing

Abstract

The invention provides an axial magnetic bearing, and particularly relates to the axial magnetic bearing of which the radial torsion can be controlled. The axial magnetic bearing comprises a stator part and a rotor, wherein the stator part comprises an inner-ring stator core, an outer-ring stator core, a permanent magnet and coils; the inner-ring stator core adopts an integral ring structure; the outer-ring stator core comprises two stator core magnetic poles which are arranged in the +X direction and the -X direction (or the +Y direction and the -Y direction); the coils are wound on the stator core magnetic poles respectively; an axial magnetic airgap is formed between the stator part and the rotor; the radial inner side of the permanent magnet is connected with the inner-ring stator core; and the radial outer side of the permanent magnet is connected with the outer-ring stator core. The axial magnetic bearings provided by the invention are required to be used in pairs, so that the radial torsion of the rotors can be controlled when the outer-ring magnetic poles of two axial magnetic bearings are placed in different positions, which greatly reduces the axial size of the system. The axial magnetic bearing further has the advantages of low rotation loss, reliable performance, convenience in control, and the like.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to an axial magnetic bearing capable of controlling radial torsion, which can be used as a non-contact support for rotating parts in spacecraft such as small satellites. Background technique [0002] Commonly used magnetic suspension bearings are divided into electromagnetic bias type and permanent magnetic bias plus electromagnetic control hybrid magnetic suspension bearing. The former uses current to generate a bias magnetic field, so the working current is large and the power consumption is large. The latter uses permanent magnets instead of current to generate a bias magnetic field. , The magnetic field generated by the permanent magnet bears the main bearing capacity, and the electromagnetic field provides the auxiliary adjustment bearing capacity, so this kind of bearing can greatly reduce the control current and reduce the loss. The axial magnetic bearing stator st...

AI Technical Summary

Problems solved by technology

The axial magnetic bearing stator structure of most existing structures is a full circle structure, which can only control the axial translation of the rotor, but cannot control the radial torsion of the rotor. Therefore, in applications where the overall axial length of the system is required to be small It is difficult to be applied in some occasions, especially the existing flywheel system, which is usually made into an outer rotor structure to reduce the overall volume, and the radial magnetic bearings used in pairs are used to control the torsion, so the radial magnetic bearings used in pairs There must be a certain span, which brings about an increase in the axial length

However, the existing three-degree-of-freedom axial magnetic bearing is divided into four magnetic poles along the inner ring core and the outer ring iron core along the circumferential direction, so the magnetic field needs to be alternated four times when the rotor rotates once, and the power consumption during high-speed rotation still not to be ignored

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