| Magnetic suspension technique is one of the newly advanced techniques in recent years. It has great exertions on the transformation from traditional mechanical product to mechatronics product for its advantages such as no mechanical contact, no wear, low power loss, no need of lubrication and long service life, etc. On the research of ultra-precision work platform for quick orientation and close motion, the application of magnetic suspension technique is helpful to improve the performance of platform prominently.The load-bearing capability of magnetic suspension is determined mainly by the design and parameters of platform. In this paper, a two-level maglev platform is taken as the research object. Firstly, the statics analysis is studied. The deflections of the upper suspension part, lower suspension part and basement is separately analyzed using ANSYS software under the states of suspension and non-suspension, the result validates the reasonability of the platform configuration. Secondly, the modal analysis is investigated. The plots of vibration shape reveal that bearing stiffness in electromagnet has great influence on the function of the platform. Thirdly, the center of mass in suspension part has no superposition with the force driven by linear electric motor due to manufacture error. Aiming at the problem the impact on structural dynamic properties induced by transient moment for non-superposition is discussed, and the effect of damping on stability is worked too. Lastly, in order to study the mechatronics coupling characteristics in the platform, the dynamic equation reflecting the coupling system is set up by Lagrange equation, that will be great help to the design of the magnetic plate controller and the selection and optimization of the controller variables. |
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