O Sistema de Levita��o Magn�tica (MLS) tem recebido cada vez mais aten��o nos �ltimos anos. Ele tem in�meras aplica��es pr�ticas em muitos sistemas pr�ticos de engenharia, como trens maglev de alta velocidade que est�o sendo usados no Jap�o e na Alemanha, rolamentos sem atrito, isolamento de vibra��o de m�quinas sens�veis, levita��o de modelos de t�neis de vento, vaiv�ns aeroespaciais, etc.O MLS controla o campo magn�tico gerado por um eletro�m� para levitar uma esfera ferromagn�tica em pleno ar. Com um controlador apropriado no la�o, o pequeno �m� levita no ar indefinidamente sem qualquer dist�rbio. O seu significado reside no facto de eliminar as perdas de energia devido ao atrito. O MLS pode ser classificado em duas categorias: Sistemas Atrativos e Sistemas Repulsivos baseados na fonte das for�as de levita��o.O MLS � um dos cl�ssicos conjuntos experimentais para ilustrar alguns dos m�todos de an�lise e projeto na educa��o de sistemas de controle. O sistema � altamente n�o linear, inst�vel em circuito aberto e extremamente desafiador de controlar.

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