Desenvolvimento de um atuador magnetico para excitação sem contato de sistemas rotativos / A magnetic actuator development for contactless excitation in rotor systems

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

A magnetic actuator as excitation source in rotating systems is developed, in order to accomplish modal analysis and other studies involving contacless excitation. Although the use of magnetic systems to apply forces onto rotating machinery has been carried out with high performance level (for example, magnetic bearings), the development of a conveniently easy and simples device for laboratory application presents interesting contribution to experimental methods used in test rigs based on similarity design to rotating machinery. The initial concept of the magnetic actuator proposed here is simple, but enables either the external excitation without contact or the vibration control when associated with a controller system. However, the performance characteristics tunning to attend the dynamic demand of the system is not so trivial. Following this focus, the work brings practical experience and discussion about the development and performance analysis of a magnetic actuator used for rotating machinery tests. The influence of the electrical current in the actuator coils, the air-gap between actuator and rotative system, thetype of surface of the actuator poles (flat or curved) as well as excitation frequency was verified. Force estimation was based on the magnetic flux density, measured by hall sensors

ASSUNTO(S)

magnetic actuators rotores - dinamica rotating machinery dispositivos magneticos modal analysis analise modal contactless excitation

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