Inner rotor radial magnetic bearing

Abstract

An inner rotor radial magnetic bearing comprises an x-direction outer stator core, a y-direction outer stator core, an outer permanent magnet, an outer coil, and an inner rotor core, wherein the x-direction outer stator core and the y-direction outer stator core are vertically disposed; both the x-direction outer stator core and the y-direction outer stator core comprise two magnetic poles with the outer coil winded on the poles; the outer permanent magnet is located between the x-direction outer stator core and the y-direction outer stator core; the inner rotor core is inside the x-directionouter stator core and the y-direction outer stator core in the radial direction; a magnetic air gap is formed between the inner rotor core and the x-direction outer stator core and the y-direction outer stator core. The invention allows an electromagnetic circuit to be uncoupled in the x and y directions of the outer stator cores of the radial magnetic bearing, and thus the control precision of the radial magnetic bearing is increased.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a permanent magnet bias magnetic bearing with radial decoupling of an inner rotor, which can be used as a non-contact support for rotor components in high-speed machinery. Background technique [0002] At present, magnetic suspension bearings are divided into pure electromagnetic bearings and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The former uses large current and power consumption, and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The electromagnetic field provides auxiliary adjustment. Bearing capacity, the magnetic field generated by the permanent magnet bears the main bearing capacity, so this kind of bearing can reduce the control current and reduce the loss. At present, in the field of hybrid radial magnetic suspension bearings, there are mainly electromagnetic ...

AI Technical Summary

Problems solved by technology

At present, in the field of hybrid radial magnetic suspension bearings, there are mainly electromagnetic magnetic circuit coupling problems in the radial x direction and y direction, which will affect the control accuracy of the magnetic bearing. Therefore, the existing radial magnetic bearings all have electromagnetic magnetic circuits in the radial direction. Coupling defects in the x-direction and y-direction. In addition, in the existing radial magnetic bearing structure, each stator core has 4 stator core poles. When the rotor rotates once, the alternating frequency of the magnetic field on its surface is 4 times. , which limits the further reduction of the eddy current loss of the existing permanent magnet bias radial magnetic bearing

Images