Adaptive control method for current loop of magnetic levitation system

Abstract

The invention discloses an adaptive control method for a current loop of a magnetic levitation system. The method comprises the following steps of: 1) judging whether the magnetic levitation system levitates stably after the magnetic levitation system levitates; 2) if the magnetic levitation system levitates stably, collecting the levitation stable current and levitation stable voltage of a coil of the magnetic levitation system, and obtaining a levitation stable resistor R of the coil; 3) superposing high-frequency current to the coil, collecting the current and voltage of the coil multiple times in the current change process of the coil, obtaining multiple inductance values in the current change process of the coil, and averaging the multiple inductance values to obtain a stable-state average inductance value L; and 4) obtaining a feedback gain Kb and a forward gain Kf of the coil, and applying the feedback gain Kb and forward gain Kf to the current loop as current loop control parameters. The method disclosed by the invention has the advantages that: the current rise time in the coil and the gain of the current loop are always kept unchanged, the levitation performance is not influenced by the change of the resistance and inductance of the coil, and the levitation performance is stable and reliable.

Description

technical field [0001] The invention relates to current loop control of a magnetic levitation system, in particular to a current loop self-adaptive control method for the magnetic levitation system. Background technique [0002] Suspension control technology is one of the core technologies of the maglev system, such as figure 1 As shown, the basic structure of the maglev system consists of a levitation magnet 1 , a levitation sensor 2 , a levitation controller 3 and a power amplifier 4 . Among them, the levitation magnet 1 is composed of a coil and an iron core, and the levitation magnet 1 is used to provide power for the maglev train; the levitation sensor 2 is used to detect the state of the levitation magnet 1, which includes a gap sensor and a current sensor, wherein the gap sensor obtains the levitation gap signal x, the current sensor obtains the current signal i. The function of the suspension controller 3 is the same as that of other similar systems. It is used to ...

AI Technical Summary

Problems solved by technology

[0005] In the actual operation process, the temperature of the electromagnet will change. With the change of the temperature of the electromagnet, the resistance and inductance of the magnet coil will change greatly, which will affect the current rise time and gain of the current loop. Will affect the overall performance of the magnetic levitation system

The current loops mentioned above are all designed based on fixed coil parameters, and their current loop control parameters are fixed. When the coil parameters change, the performance of the current loop will change, which will affect the overall performance of the magnetic levitation system.

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