scholarly journals A New Strategy for Improving the Tracking Performance of Magnetic Levitation System in Maglev Train

Symmetry ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1053 ◽  
Author(s):  
Mingda Zhai ◽  
Zhiqiang Long ◽  
Xiaolong Li
Keyword(s):  
Mathematical Model ◽  
Magnetic Levitation ◽  
Tracking Performance ◽  
New Method ◽  
Maglev Train ◽  
Running Speed ◽  
Levitation System ◽  
New Strategy ◽  
Magnetic Levitation System ◽  
Track Irregularity

The maglev train is a whole new method of transportation without wheels, consisting of 20 groups of symmetry suspension units. The magnetic levitation system plays a major role in suspending the maglev train stably and following the track quickly with the desired gap. However, vertical track irregularity in the maglev train line has a dreadful effect on the tracking performance of the magnetic levitation system. The investigations carried out by our team have revealed that the fluctuation of the suspension gap becomes more and more serious with increases in running speed. In this paper, a mathematical model with consideration of vertical track irregularity is established. In order to overcome and suppress the fluctuation of the suspension gap, we propose a new strategy which includes installing an accelerometer on the electromagnet to address this problem. This strategy has already been successfully implemented and applied to the suspension controller for a magnetic levitation system in the Changsha maglev express. Real operation data indicates the tracking performance of the magnetic levitation system was obviously improved.

scholarly journals DETERMINATION OF TRANSFER FUNCTION OF MAGNETIC LEVITATION MODEL AND EXPERIMENTAL VERIFICATION OF OPTICAL SENSOR

2019 ◽  
pp. 148-154
Author(s):  
Erik Prada
Keyword(s):  
Mathematical Model ◽  
Transfer Function ◽  
Experimental Verification ◽  
Optical Sensor ◽  
Magnetic Levitation ◽  
Positioning Systems ◽  
Levitation System ◽  
Magnetic Levitation System ◽  
The Mathematical Model

Urgency of the research. The potential of controlling the position of levitating objects has great application in deposition and in various positioning systems. Magnetic levitation eliminates direct mechanical friction between moving parts. Target setting. The measurement shielding method used is one of the methods of determining the position of a levitating object. By combining positioning and regulating elements, we achieve a feedback control. The use of a given type of measurement has advantages in places where the use of other methods is not appropriate. Actual scientific researches and issues analysis. The problem of magnetic levitation is addressed by several research laboratories with a direct connection to practice. The problem that is currently solved within magnetic levitation is the regulation of the levitating object using various types of regulators. The research objective. Derivation of mathematical model of magnetic levitation and examination of nonlinear system followed by linearization by Taylor series. Experimental determination of characteristics and dependence between object position, voltage and current. The statement of basic materials. The position of the levitating object is determined by the shading of the optical sensor. The light source is a laser light. Conclusions. In this work we defined the mathematical model of the magnetic levitation system and subsequently derived the transfer function of the levitation system and the position sensor. From the experimental verification of the shadow method for the determination of the position of the levitating object and the consequent need for regulation, we found that the dependence of the position of the levitating object on current and voltage on the photodiode is linear in the active region.

scholarly journals Control PI difuso de un sistema de levitación magnética mediante un sistema embebido

2019 ◽  
Vol 20 (4) ◽  
pp. 1-11
Author(s):  
Yair Lozano Hernández ◽  
Oscar Octavio Gutiérrez Frías ◽  
Mario Villafuerte Bante
Keyword(s):  
Mathematical Model ◽  
Trajectory Tracking ◽  
Magnetic Levitation ◽  
Magnetic Bearing ◽  
Control Action ◽  
Tracking Tasks ◽  
Control Scheme ◽  
Levitation System ◽  
Non Linear ◽  
Magnetic Levitation System

In the present work, the design and implementation of a control scheme is presented. The aim of the control scheme is to perform regulation and trajectory tracking tasks in the position of a magnetic levitation system, which acts by electromagnetic repulsion. Such levitation system consists of a beam operated by an active magnetic bearing in pendular configuration. Although the Proportional Integral Derivative (PID) controller shows arithmetic simplicity, ease of use, high robustness and error equal to zero in stable state (Pal & Mudi, 2008), the magnetic levitation system mathematical model is highly non-linear and is subject to uncertainty or variation of its parameters. Therefore, the PID control does not guarantee the fulfillment of trajectory tracking tasks (Precup & Hellendoorn, 2011). In summary, a diffuse PI is used due to the system non-linear dynamics and the hysteresis present in the electromagnet. The controller design was made with the following methodology: the mathematical model and the non-linear characteristics of the system are analyzed; the universes of error discourse (derived from error and control action) are experimentally measured. The experimental data was used for the fuzzification, defuzzification, statement of the rules and controller gains. The implemented rules were designed for a PD-Fuzzy in which a numerical integration of the control action was applied, obtaining a Fuzzy PI. Finally, the implementation was made on the STM32F407G-DISC card, which was programmed with MATLAB-Simulink software tools. The experimental results show that the proposed controller works even below the horizontal, where the behavior can show singularities or physical problems such as magnetization. In compliance with the stated objectives for a range of -5 to 10 radians, these results are maintained even in the presence of disturbances, demonstrating the feasibility of the controller.

scholarly journals Model predictive control of a magnetic levitation system using two-level state feedback

2020 ◽  
Vol 53 (5-6) ◽  
pp. 962-970
Author(s):  
Zhenlin Zhang ◽  
Yonghua Zhou ◽  
Xin Tao
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Control Strategy ◽  
State Feedback ◽  
Magnetic Levitation ◽  
Air Gap ◽  
State Variables ◽  
Maglev Train ◽  
Levitation System ◽  
Magnetic Levitation System

The magnetic levitation system is a critical part to guarantee safe and reliable operations of a maglev train. In this paper, the control strategy is proposed for the magnetic levitation system based on the model predictive control incorporating two-level state feedback. Taking advantage of the measurable state variables, that is, air gap, electromagnet acceleration, and control current through high-resolution sensor measurement, the first-level nonlinear state feedback is to linearize the unstable nonlinear magnetic levitation system, and the second-level linear state feedback is to further stabilize the system and improve the dynamic performances, which together provide a stable prediction model. The simulation results demonstrate that the proposed control strategy can ensure high-precision air gap control and favorable disturbance resistance ability.

scholarly journals Maglev Technology and the World Scenario

2021 ◽  
Vol 9 (10) ◽  
pp. 1594-1600
Author(s):  
S Anurag
Keyword(s):  
Developing Countries ◽  
Magnetic Levitation ◽  
Superconducting Magnets ◽  
Maglev Train ◽  
Linear Induction ◽  
Levitation System ◽  
The World ◽  
Magnetic Levitation System ◽  
Side Walls

Abstract: In this growing world when cities and towns continue to become more crowded , the modes of transportation that are currently available to us will not be able to handle the demands of these overpopulated areas. This problem can be solved by the concept of electromagnetism. Electromagnets and superconducting magnets have allowed us to create a magnetic levitating train nicknamed “Maglev” which reduces friction between track and train by floating over it instead of directly being in contact. This has a lot of potentials to create trains that require a high initial investment but later on low maintenance and helps in fast transportation thus saving time. The magnetic levitation system used by these trains play an important role in suspending the Maglev train stably and following the track quickly with the adequate gap from the side walls thus highly reducing chances of damage. This paper gives an idea about the tech aspects of maglev projects worldwide such as Germany, Japan, and USA and also discusses about various idea to bring Maglev trains in developing countries like India. Keywords: Maglev, superconducting magnets, magnetic levitation, Transrapid, lateral guidance, linear induction morot, frictionless travel.

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