A FM coil sensor using digital electronics is described here for use as a position transducer in a magnetic suspension. This is similar to the Q-coil method of Beams et al. [Rev. Sci. Instrum. 33, 151 (1962)] as used in magnetic suspensions except that a different parameter is being controlled. The circuits are presented and their operating characteristics are discussed.
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Bernard et al. (1982) studied this question.
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