DEELT - Departamento de Engenharia Elétrica

URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/5266

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20202

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Autor: search.filters.author.Ferreira, André Augusto

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
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    Low-frequency underwater wireless power transfer : maximum efficiency tracking strategy.
    (2020) Lopes, Israel Filipe; Valle, Rodolfo Lacerda; Fogli, Gabriel Azevedo; Ferreira, André Augusto; Barbosa, Pedro Gomes
    This paper proposes a strategy to improve the efficiency of a low-frequency Wireless Power Transfer (WPT) system used to charge the battery of an Autonomous Underwater Vehicle (AUV) through an Inductive Power Transfer (IPT). The IPT system uses a Split-Core Transformer (SCT) to transfer power from the docking base to the AUV, without electric contact. Under gap variation, the efficiency is changed because the variation of SCT parameters. Therefore, the input frequency is changed in order to improve the efficiency of the system trough the Maximum Efficiency Point Tracking algorithm (MEPT) without communication between primary and secondary sides. Experimental results are presented to validate the theoretical analysis and to demonstrate the behaviour of the transformer under different values of gap and excitation frequency.
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    Simple and effective digital control of a variable-speed low inductance BLDC motor drive.
    (2020) Valle, Rodolfo Lacerda; Almeida, Pedro Machado de; Fogli, Gabriel Azevedo; Ferreira, André Augusto; Barbosa, Pedro Gomes
    This paper presents a simple digital control applied to a low inductance 5 kW/48 V three-phase brushless DC motor. Controlling the VSI as a full-bridge converter allowed the use of unipolar switching strategy, increasing the output equivalent frequency up to 100 kHz. The aforementioned strategy has made it possible to control the three-phase currents using a single deadbeat controller without a back-EMF feed-forward compensation. Stability analysis is performed to show that the proposed current control presents good transient response under reasonable parametric variations, as well as zero steady-state error. Precise regulation with no overshoot was obtained using an IP controller to regulate the motor speed. Experimental results are presented to validate the theoretical analysis and to compare with a conventional PI compensator and a predictive controller.