A Levitation Control Method Without Air Gap Differential Feedback

Abstract

The invention discloses a suspension control method of air-gap-free derivative feedback. A detected air gap value, an electromagnet current differential, an electromagnet voltage and an electromagnetresistance drop are taken as state feedback variables, and a closed loop feedback controlled quantity of a middle-low speed maglev train suspension control system is constructed. The suspension control method has the beneficial effects that an air gap differential is not adopted to serve as a feedback variable, an air gap differential component needed by the feedback system is provided through anactual air gap differential component implied in the voltage, system disturbance caused by track disturbance through detecting of the air gap value differential is avoided, meanwhile a function of theair gap value is adopted to serve as a feedback coefficient, and the system disturbance caused by an error of the air gap value is reduced. According to the suspension control method, the suspensioncontrol method is used for a middle-low speed maglev train suspension control system, and the suspension control method has important theoretical significance and construction value for solving the problem that disturbance is caused by track disturbance to the stability of a suspension system.

Description

technical field [0001] The invention relates to the technical field of suspension control of medium and low-speed maglev trains, in particular to a suspension control method without air gap differential feedback. Background technique [0002] The suspension system of medium and low-speed maglev trains adopts the form of electromagnetic suction suspension. The suspension electromagnet generates electromagnetic suction between the current and the track. Suspension, keep a fixed distance between the electromagnet and the track, that is, the air gap value between the suspension surface of the electromagnet and the suspension surface of the track remains unchanged. [0003] The electromagnetic suction levitation system is an inherently unstable system. The electromagnet current in the system needs to be adjusted in real time according to the closed-loop feedback link to realize the stable levitation of the system. The closed-loop feedback link obtains the distance between the el...

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Problems solved by technology

[0013] On the one hand, the differential feedback provides the necessary damping of the system, and the system needs a large differential feedback value; on the other hand, the differential of the air gap detection value contains track disturbance components and noise. The noise usually has a fixed frequency characteristic and can be suppressed by filtering, but the track disturbance components vary with time. With the increase of vehicle speed, the disturbance component will also increase with the increase of vehicle speed, and the corresponding disturbance frequency will also change, which is difficult to deal with by setting the filter method

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