Radial high-bearing-capacity hybrid magnetic bearing

Abstract

The invention relates to a non-mechanical-contact magnetic bearing, and discloses a radial large-bearing-capacity hybrid magnetic bearing. The hybrid magnetic bearing comprises a stator and a rotor located on an inner ring of the stator, wherein the stator comprises a left radial stator core, four axial cores which are distributed on the circumferential edge at equal intervals and are the same insize, a right radial stator core and a non-magnetic-conductive shell. The rotor comprises a left rotor core, an axially-magnetized permanent magnet ring, a right rotor core and a rotating shaft. According to the bearing, static bias magnetic flux is provided by the axially-magnetized rotor permanent magnet ring, and corresponding bias magnetic flux is adjusted by radial control magnetic flux generated by electrifying a radial control winding; and a radial magnetic pole of the hybrid magnetic bearing with the structure has no winding, the area of the magnetic pole can be designed to be maximum,the radial bearing capacity is effectively increased, the axial length is reduced, the size is small, the structure is compact, the critical speed is high, and the suspension force density is large.

Description

technical field [0001] The invention relates to the technical field of non-mechanical contact magnetic bearings, in particular to an axial winding hybrid magnetic bearing, which can be used as a non-contact suspension support for high-speed transmission components such as flywheel systems, machine tool electric spindles, and centrifuges. Background technique [0002] The magnetic bearing is a new type of high-performance bearing that uses the electromagnetic force between the stator and the rotor to suspend the rotor in space, so that there is no mechanical contact between the stator and the rotor. At present, magnetic bearings are divided into AC type and DC type according to the type of control current. The AC magnetic bearing adopts the three-pole magnetic bearing driven by the three-phase inverter, which reduces the size of the power amplifier and the cost of the magnetic bearing, but the three-pole structure is asymmetrical in space, and requires the three-phase inverte...

AI Technical Summary

Problems solved by technology

The radial control winding of the hybrid magnetic bearing with this structure occupies radial space, and the radial magnetic pole area cannot be maximized, and it is necessary to install shells on both sides to protect the winding, resulting in small radial bearing capacity and long axial length. low critical speed

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