Method for implementing low power consumption suspension of five-freedom degree magnetic suspension system axial magnetic bearing

Abstract

The invention discloses a method for realizing low power consumption suspension of an axial magnetic bearing, which comprises the following steps: (1) superposing a feedback displacement signal x of a rotor, a given reference position sr and a displacement compensating signal rn to obtain an error signal e; (2) adding the error signal e into a PID adjuster to obtain control current im; (3) amplifying the control current im and inputting the control current im to a permanent magnet biased magnetic bearing; (4) at the same time, adding the im as a feedback signal, a displacement compensating signal ro at the previous moment and a displacement compensating signal roo at the more previous moment output by a two-level storage unit into a low power consumption displacement compensating module to obtain a displacement compensating signal rn; and (5) stacking the rn, the sr and the x to generate the error signal e after the rn is obtained,; at the same time, putting the rn into the storage unit as the ro of the next moment, and putting the ro into the storage unit of next level as the roo of the next moment. Therefore, the whole control flow is circularly operated. The control current in an axial control coil reaches to be minimum, and the method realizes low power consumption.

Description

technical field [0001] The invention relates to a method for realizing low-power levitation of an axial magnetic bearing of a five-degree-of-freedom magnetic suspension system, which belongs to a method for controlling a five-degree-of-freedom magnetic suspension bearing system. Background technique [0002] At present, the five-degree-of-freedom magnetic suspension bearing system adopts two radial magnetic suspension bearings plus an axial magnetic suspension bearing or an axial-radial magnetic suspension bearing plus a radial magnetic suspension bearing structure, providing an axial and four radial magnetic suspension force, so that the rotor can be stably suspended in the equilibrium position when it is running in suspension. [0003] 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. [0004] The active magnetic suspension bearing establishes a bias magnetic fiel...

AI Technical Summary

Problems solved by technology

[0007] For the five-degree-of-freedom magnetic levitation system that adopts the above-mentioned hybrid magnetic levitation bearing in the axial direction, in the block diagram of the axial degree of freedom PID control (that is, the block diagram of the feedback system composed of the PID regulator and the mathematical model of the axial degree of freedom of the magnetic bearing), the control current is given by The feedback error signal is generated by the PID regulator. If the displacement deviation is too large, the error signal will be too large, which will saturate the control current.

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