Radial-axial three-degree-of-freedom alternating current-direct current hybrid magnetic bearing

Abstract

The invention discloses a radial-axial three-degree-of-freedom alternating current-direct current hybrid magnetic bearing used for non-contact suspension bearing. An axial control coil is arranged between a radial stator core and an axial stator core; an axial air gap is formed between the axial stator core and the end face of a rotor in the axial direction; three same stator core magnetic poles uniformly distributed in the circumferential direction extend from the wall of an inner cavity of the radial stator core to the axle center; same radial control coils are wound on the three stator core magnetic poles, and radial air gaps are formed between the stator core magnetic poles and the outer wall of the rotor in the radial direction; same axially magnetized annular permanent magnets are arranged between two axial sides of the radial stator core and the axial stator core; and S poles of the permanent magnets face the radial stator core, and N poles of the permanent magnets face the axial stator core. The radial-axial three-degree-of-freedom alternating current-direct current hybrid magnetic bearing integrates axial and radial functions, is only driven by a three-phase alternating current power inverter, is provided with two axially magnetized annular permanent magnets, controls the magnetic flux not to pass magnetic poles where the permanent magnets are positioned, and has the advantages of low power consumption, small volume, light weight and high bearing capacity.

Description

Technical field [0001] The invention relates to a non-mechanical contact magnetic bearing, in particular a radial-axial three-degree-of-freedom AC-DC hybrid magnetic bearing, which can be used as a five-degree-of-freedom magnetic suspension high-speed machine tool electric spindle, a bearingless motor, a flywheel energy storage system, and an air conditioner Non-contact suspension support for rotating parts in mechanical equipment such as compressors, turbomolecular pumps and spacecraft such as satellites and space stations. Background technique [0002] At present, hybrid magnetic bearings in which permanent magnets provide static bias magnetic flux and DC signals provide control magnetic flux have become a research hotspot at home and abroad, and focus on the study of axial single-degree-of-freedom magnetic bearings and radial two-degree-of-freedom magnetic bearings. There are few studies on radial-axial three-degree-of-freedom magnetic bearings. On the one hand, with DC contr...

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Problems solved by technology

[0005] The publication number is CN1737388, and the patent document titled "three-degree-of-freedom AC-DC radial-axial hybrid magnetic bearing and its control method" proposes that the magnetic bearing adopts a single-piece stator, and the stator is divided into an axial stator and a radial There are two parts to the stator, and the structure of the magnetic pole and the rotor is relatively simple. The disadvantage is that the space occupied by the axial control coil and the radial control coil is limited, resulting in a decrease in the bearing capacity of the magnetic bearing and poor heat dissipation performance.

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