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Dive into the research topics where Rubens de Andrade is active.

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Featured researches published by Rubens de Andrade.


IEEE Transactions on Applied Superconductivity | 2011

Tests on a Superconductor Linear Magnetic Bearing of a Full-Scale MagLev Vehicle

G. G. Sotelo; D. H. N. Dias; Rubens de Andrade; Richard M. Stephan

A full-scale MagLev vehicle prototype has been developed by the team of the Laboratory for Applied Superconductivity from the Federal University of Rio de Janeiro. This vehicle is named MagLev-Cobra (cobra means snake in Portuguese), because it is composed by several modules and its motion in curves resembles the movement of a snake. The suspension technology proposed for this vehicle is the levitation of bulk superconductors above a rail made with Nd-Fe-B magnets and steel. The main advantages of the MagLev-Cobra vehicle are low energy consumption, negligible noise emission, curvature radius of 45 meters and capability to ascend ramps of 15%. These properties allow the vehicle to be perfectly adjusted to big cities layout and to be constructed along roads and rivers. One of the most important parts of this project is the superconductor linear magnetic bearing (SLMB) development for the MagLev. In this work, some new results of the SLMB are presented. Measurements of the vertical levitation force of the SLMB and the effect of the flux creep on this force are presented. Also, some tests were made to investigate the influence of the load variation on the levitation force and the SLMB levitation gap. Finally, some tests were made to measure the levitation force and torque in the cryostat for an angular displacement between it and the magnetic guideway. These tests simulate the vehicle operation in real conditions.


IEEE Transactions on Applied Superconductivity | 1999

Superconducting axial bearing for induction machines with active radial magnetic bearings

R. Nicolsky; Y. Gorelov; A.S. Pereira; D.F.B. David; A. Santisteban; Richard M. Stephan; A. Ripper; Rubens de Andrade; W. Gawalek; T. Habisreuther; T. Strasser

A superconducting passive axial bearing has been developed for an induction machine with vertical rotor and two active radial magnetic bearings, resulting in a fully levitating system. This prototype has been designed on the basis of a previous one reported by Salazar-Stephan as a 4-pole 2-phase induction machine using windings of a standard motor. Each active radial bearing measures four shaft-positions using eddy-current sensors, each displaced by 90 degrees. The levitation has been performed using two NdFeB permanent magnets and bulk pieces of seeded-melt-textured YBCO. The YBCO pieces have been characterized by measuring the levitation forces and mapping the remanent magnetic field with Hall probes. The radial stability of the system is modeled and discussed.


IEEE Transactions on Applied Superconductivity | 2014

Lateral Displacement Influence on the Levitation Force of YBCO Coated Conductor Linear Bearings

Felipe Sass; D. H. N. Dias; G. G. Sotelo; Rubens de Andrade

Superconducting coated conductors have been used for several large-scale applications. One potential application for YBCO second-generation (2G) wire is the development of superconducting magnetic bearings (SMB). The main advantages of 2G wires are large scale production, high critical current density values, lower manufacturing cost than first generation, and superior performance under high magnetic fields. This work proposes a study of a linear SMB using 2G wires as a passive levitator for MagLev vehicles. The 2G block is conceived to replace the YBCO bulk in the MagLevs SMB prototype, which is being built at Federal University of Rio de Janeiro. In this context, a superconducting block using stacked 2G wires was built to evaluate the behavior of this SMB. The forces between the 2G block and a permanent magnet were measured and compared with the results for an YBCO bulk with nearly the same dimensions. The experimental rig used for this work allows vertical and lateral displacements and a load cell is used to evaluate the SMB levitation force decay due to the lateral movement. The 2G block has presented lower force levels than ordinary YBCO bulks, but it presents potential to be applied in a SMB application.


IEEE Transactions on Applied Superconductivity | 2016

Simulation of a Superconducting Fault Current Limiter: A Case Study in the Brazilian Power System With Possible Recovery Under Load

Wescley Tiago Batista de Sousa; Tatiana Mariano Lessa Assis; A. Polasek; Andreia Maia Monteiro; Rubens de Andrade

In this paper, simulations of superconducting fault current limiters (SFCLs) in a real scenario are presented as an alternative solution for overstressing installed components in a substation of the Brazilian Interconnected Power System. A technical comparison between SFCLs and air-core reactors has been made. Simulations were based on the electrothermal analogy method, which allows the study of the electrical transitory and thermal behavior of the device with low computational effort. The simulated design of SFCL is supposed to operate without a circuit breaker in line with the device, since its design enables its recovery to normal operating conditions under load. Simulations indicate that SFCLs may be more effective than air-core reactors for protecting the substation in study. Furthermore, a fast recovery to the superconducting state has been found.


IEEE Transactions on Applied Superconductivity | 2018

Pulse Magnetization of Jointless Superconducting Loops for Magnetic Bearings Height Control

Vagner Santos da Cruz; Guilherme Theophilo Telles; Antonio Carlos. Ferreira; Rubens de Andrade

Superconductors can be used for applications such as magnetic levitation. The Maglev Cobra project, developed at the Universidade Federal do Rio de Janeiro, uses superconducting bulks, which are produced in a partially industrial process, which does not guarantee homogeneity, and operate passively, making height control impossible. Replacing these bulks with jointless 2G wires superconducting loops will guarantee a homogenous production and enables active control of levitation height through current pulse magnetization. In this work, superconducting loops were exposed to different values of current pulse width and intensity. The induced current in the tape was then measured. With this, the persistent current behavior in the superconductor could be observed, showing a correlation between the persistent current and the applied current pulse parameters. Saturation of the current in the superconductor was observed above certain values of applied current, due to the critical current value of the superconducting tape. Furthermore, as the width of the current pulse increases, the persistent current increment decreases. According to these results, an optimum point can be observed, in which the ratio between the persistent current and the energy used is maximized. To operate at the optimum point, the current pulse width must decrease as its intensity increases.


Revista Brasileira De Ensino De Fisica | 2016

Projeto MagLev Cobra - Levitação Supercondutora para Transporte Urbano

Wescley Tiago Batista de Sousa; Richard M. Stephan; Felipe Santos Costa; E. Rodriguez; Flávio Goulart dos Reis Martins; Roberto Andre Henrique de Oliveira; Rubens de Andrade

This work presents the main properties of the MagLev Cobra Project, currently in development at Federal University of Rio de Janeiro. One presents the basics on magnetic levitation technique, highlighting the advantages of the proposed method faced to wheel/rail systems and light rail vehicles. The history of the project is presented. Technical details, such as the line of permanent magnets, the cryostats with superconductors, the linear traction motor, are discussed. Finalizing, the sustainability of the project is highlighted, considering its economic, social and environmental impacts.


Revista Brasileira De Ensino De Fisica | 2012

Limitadores de corrente de curto-circuito supercondutores: principais conceitos e testes

Wescley Tiago Batista de Sousa; A. Polasek; R. Dias; Rubens de Andrade

In this paper we present a study about fault current limiters based on superconducting materials for the protection of electrical networks considering the increase in the level of short circuit current. Commercial modules were submitted to short-circuit tests (currents in order of kA) with the aim of analyzing the effectiveness of these devices in current limitation. The test results can be considered satisfactory because the limiters modules were efficient in current limitation.


Brazilian Journal of Physics | 2002

Mean field J C estimation for levitation device simulations in the bean model using permanent magnets and YBCO superconducting blocks

Marcelo Azevedo Neves; G C Costa; Agnaldo Souza Pereira; Rubens de Andrade; R. Nicolsky

This work presents a mean field estimation of JC as a bulk characteristic of YBCO blocks. That average JC allows a good fitting of the finite-element-method (FEM) simulation of the levitation forces to experimental results. That agreement is quite enough for levitation requirements of device projects, at short gaps and zero field cooling process, within the Bean model. The physical characterization for that estimation was made measuring the interaction force between the PM and one YBCO block in 1-D and mapping the trapped magnetic field in those blocks in 2-D.


Eletrônica de Potência | 2008

THIRD GENERATION OF FLYWHEELS: A PROMISING SUBSTITUTE TO BATTERIES

Richard M. Stephan; Rubens de Andrade; G. G. Sotelo


Eletrônica de Potência | 2010

Dynamic Non-linear Model Of A Switched Reluctance Machine For Operation As Motor/generator

G. G. Sotelo; Marcelo Raposo Ribeiro; Maurício El-Mann; L.G.B. Rolim; José Luiz da Silva Neto; Rubens de Andrade; Antonio Carlos Ferreira; R.M. Stephan; Walter Issamu Suemitsu

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Richard M. Stephan

Federal University of Rio de Janeiro

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G. G. Sotelo

Federal Fluminense University

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R. Nicolsky

Federal University of Rio de Janeiro

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Felipe Sass

Federal Fluminense University

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Wescley Tiago Batista de Sousa

Federal University of Rio de Janeiro

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A. Ripper

Federal University of Rio de Janeiro

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D. H. N. Dias

Federal Fluminense University

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Flávio Goulart dos Reis Martins

Federal University of Rio de Janeiro

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Agnaldo Souza Pereira

Federal University of Rio de Janeiro

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