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This paper reports on the design and dynamic analysis of magnetically levitated electromagnets with a low-resolution position sensor. On the basis of the equivalent magnetic circuit method and a 3-D finite element analysis model, an initial and detailed design of an electromagnet was realized. The validity of the design was confirmed analytically and experimentally. Then, by employing a closed-loop proportional-integral-derivative control algorithm, the dynamic behavior of the electromagnets was also investigated experimentally. In particular, by employing low-pass filters for a low-resolution position sensor and an acceleration sensor, the air gap could be precisely controlled at low cost.
Date of Publication: Nov. 2012