A kind of control method of magnetic suspension bearing

Abstract

The invention discloses a method for controlling a magnetic suspension bearing, which belongs to the technical field of bearings. The invention is powered by a DC power supply, a single-phase full-bridge power converter is used as an electric energy conversion device, and a magnetic suspension bearing body is used as a control object. The present invention uses a three-closed-loop control mode as the control structure, wherein the feedback signals in the three-closed-loop include three feedback control quantities of real-time displacement, moving speed signal, and real-time current. The real-time displacement and moving speed signals are observed through the cooperation of the displacement sensor and the differential tracker, and the real-time current is observed through the current sensor. Compared with the traditional magnetic suspension bearing control scheme, this method can obtain stronger control stiffness, stronger stability, and higher control precision by performing closed-loop control on the three feedback control variables.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a method for controlling a magnetic suspension bearing. Background technique [0002] Magnetic suspension bearing is a kind of bearing that uses output electromagnetic force to realize the suspension of moving parts, thereby replacing traditional mechanical bearings with ultra-quiet, high efficiency, high speed / speed and high reliability bearings. , ultra-quiet and other fields have been widely used. The working principle of the magnetic suspension bearing is: through the displacement sensor to detect the displacement feedback of the magnetic suspension bearing rotor in real time, and then through the magnetic suspension controller to control the current injected into the magnetic suspension bearing body in real time, and then control the levitation force to realize the stable suspension of the magnetic suspension bearing rotor. The traditional maglev control algorithm adopts a...

AI Technical Summary

Problems solved by technology

The traditional maglev control algorithm adopts a displacement current double closed-loop control structure. The problems of this type of control structure are: (1) The system faced by the displacement control loop is a secondary system, and a high-order displacement regulator is required to realize the control system. Stable operation, and then achieve suspension;

[0003] (2) The high-order displacement regulator needs to set a large number of parameters to achieve the optimal effect, and the setting process is relatively complicated;

[0004] (3) The ability of high-order displacement regulators to suppress disturbance changes is weak, so when external disturbances occur in the system, it will seriously affect the control accuracy and control stiffness of the magnetic suspension bearing

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