Axial-radial electrically-excited magnetic bearing

Abstract

The invention discloses an axial-radial electrically-excited magnetic bearing. Stators of the magnetic bearing comprise E-shaped stators and C-shaped stators, wherein rotors comprise radial suspension rotors and axial suspension rotors; windings comprise a bias winding, an radial suspension winding and an axial suspension winding; the radial suspension winding comprises two suspension windings in radial direction; both the number of the E-shaped stators and the number of the C-shaped stators are 4; the middle tooth width of each E-shaped stator is two times to that of other two teeth; the radial suspension rotors and the axial suspension rotors are cylindrical structures; the bias winding is capable of simultaneously providing radial bias magnetic flux and axial bias magnetic flux; the radial suspension winding is capable of controlling radial suspension; the axial suspension winding is capable of controlling axial suspension. Through the axial-radial electrically-excited magnetic bearing, the axial suspension force and the radial suspension force are decoupled with each other; two radial suspension forces are also decoupled with each other; magnetic circuits are isolated from one another; the magnetic bearing is high in fault-tolerance performance, few in control variables, simple to control and few in power circuits.

Description

technical field [0001] The invention relates to an axial radial electric excitation magnetic bearing, which belongs to the field of magnetic suspension bearings. Background technique [0002] Magnetic suspension bearings can be divided into three types: active type, passive type and hybrid type according to the way the magnetic field is established. The active magnetic suspension bearing establishes a bias magnetic field in the air gap through the bias winding of direct current, and establishes a control magnetic field in the air gap through the control winding of alternating current whose size and direction are controlled in real time. The superposition and cancellation of the magnetic field in the air gap produces a magnetic field attraction whose size and direction can be actively controlled, thus realizing the stable suspension of the rotor. This type of magnetic bearing has high rigidity and can be precisely controlled, but it needs to produce a unit bearing capacity. ...

AI Technical Summary

Problems solved by technology

The active magnetic suspension bearing establishes a bias magnetic field in the air gap through the bias winding with direct current, and establishes a control magnetic field in the air gap through the control winding with alternating current whose size and direction are controlled in real time. The superposition and cancellation of the magnetic field in the air gap produces a magnetic field attraction whose size and direction can be actively controlled, thereby realizing the stable suspension of the rotor. This type of magnetic suspension bearing has high rigidity and can be precisely controlled, but the unit bearing capacity required The size, weight and power consumption are relatively large

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