Outer rotor radial magnetic bearing

Abstract

The invention relates to an outer rotor radial magnetic bearing, which comprises a x direction inner stator iron core, a y direction inner stator iron core, an inner permanent magnet, inner coils and an outer rotor iron core, wherein the x direction inner stator iron core and the y direction inner stator iron core are placed vertically, the x direction inner stator iron core and the y direction inner stator iron core are respectively provided with two magnetic poles, the inner coils are wound on the magnetic poles, the inner permanent magnet is positioned between the x direction inner stator iron core and the y direction inner stator iron core, the radial outer parts of the x direction inner stator iron core and the y direction inner stator iron core are the outer rotor iron core, and themagnetic air gaps are formed between the x direction inner stator iron core, the y direction inner stator iron core and the outer rotor iron core. According to the present invention, the electromagnetic circuit is not subjected to coupling on the x direction and the y direction in the inner stator iron core of the radial magnetic bearing so as to improve the control precision of the radial magnetic bearing.

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 outer 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. Defects of x-direction and y-direction coupling

In addition, in the existing radial magnetic bearing structure, each stator core has 4 stator core poles, and the rotor rotates once, and the alternating frequency of the magnetic field on its surface is 4 times, which limits the existing permanent magnet bias. Further Reduction of Eddy Current Loss in Radial Magnetic Bearings

Images