Improved differential optical position detector for magnetic suspension systems

Interruptdriven digital controller for a magnetic suspension system Rev. Sci. Instrum. 60, 456 (1989);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 75Hz w hen the magnet current has series transistor regulation, and at 100 Hz in a thyristor-regulated system.

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Magnetic suspension systems with digital controllers

Carmichael

Hinchliffe

Murgatroyd

et al. 1986

Review of Scientific Instruments

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Magnetic flotation in densimetry

Bignell¹

2006

Meas. Sci. Technol.

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A review of the techniques used in densimetry that use magnetic interaction between a buoy and a current-carrying coil is given. The design of coils for stability and zero temperature effect is discussed. The measurement of the upthrust force on the buoy may be done using the magnetic force directly or using a mass balance with the buoy suspended magnetically. The position of the buoy may be sensed using inductance, capacitance and optical techniques. Three examples of measurements made with different techniques are given.

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Improved differential optical position detector for magnetic suspension systems

Cited by 2 publications

References 4 publications

Magnetic suspension systems with digital controllers

Magnetic suspension systems with digital controllers

Magnetic flotation in densimetry

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