Magnetic suspension systems with digital controllers

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Abstract
Single-axis magnetic suspensions, using optical position sensing and dc electromagnets, have been developed with eight-bit-word digital controllers that replace the familiar analog phase-advance or proportional-plus-derivative circuits. Control algorithms are obtained by a simple curve-fitting approach to signals sampled at constant rates. Stable suspension has been demonstrated at sampling rates down to 75 Hz when the magnet current has series transistor regulation, and at 100 Hz in a thyristor-regulated system.

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