Sensors For Magnetic Bearings

Boehm, J.; Gerber, R.; Kiley, N.R.C.

doi:10.1109/intmag.1993.642676

Cited by 15 publications

(20 citation statements)

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“…Among the different position sensors, the eddy current type is mostly used in magnetic suspension applications. This sensor shows excellent frequency response with very little phase shift [22]. Linearity is also good within its operating range.…”

Section: Position Sensormentioning

confidence: 93%

A Review Note on Different Components of Simple Electromagnetic Levitation Systems

Banerjee¹,

Sarkar²,

Biswas⃰³

et al. 2011

IETE Tech Rev

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Electromagnetic levitation is an important area of research. There is lot of applications of maglev in industry. Extensive research is going on for the last two decades throughout the world to design the latest form of the maglev system. Due to interdisciplinary nature, many aspects are still open in maglev research. The major components in an electromagnetic suspension system are (i) actuator, (ii) sensor, (iii) controller, and (iv) power amplifier. For the successful implementation for any maglev-based project, the basic knowledge of these components is necessary. In this manuscript, an extensive review of different components of electromagnetic levitation systems has been presented.

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Section: Position Sensormentioning

confidence: 93%

A Review Note on Different Components of Simple Electromagnetic Levitation Systems

Banerjee¹,

Sarkar²,

Biswas⃰³

et al. 2011

IETE Tech Rev

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“…Suppose also that the external magnetic field B only acts on regions that correspond to A wn of the original coil. The flux n through the n th turn of the continuous coil can be found by substituting A n for A wn in equation (7). Since B is defined to be 0 outside of A wn , it can be found that n = (1) n A wn / A n .…”

Section: Faraday's Law Of Inductionmentioning

confidence: 99%

“…Some of the more recent applications of induction have been related to friction reduction through such means as magnetic bearings [7,8]. Furthermore, the dissipative nature of induction has led to developments in such areas as magnetic brakes [9][10][11] and structural vibration suppression [12][13][14][15][16], effectively replacing friction as a means of energy dissipation.…”

Section: Introductionmentioning

confidence: 99%

On the nonlinear electromagnetic coupling between a coil and an oscillating magnet

Sneller¹,

Mann²

2010

J. Phys. D: Appl. Phys.

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The electromagnetic induction of voltage across a coil due to the motion of a magnet is among the fundamental problems of physics, and it has a broad range of practical applications. While Maxwell's equations exactly describe this phenomenon, the physical complexity inherent in most realistic situations often prevents the generation of closed-form expressions for the electromagnetic coupling. This paper uses basic principles to develop an approximate analytical expression for the induced voltage in terms of a set of physical parameters, and experimental results demonstrate a high level of validity in the model over the parameter values tested. For oscillatory magnet motion about a point on a coil's axis, it is shown that the induced voltage is an infinite sum of harmonics at integer multiples of the oscillation frequency; the relative amplitudes of these harmonics vary as the magnet's equilibrium position migrates along the coil's axis, causing the odd and even harmonics to vanish, reappear and reach peak values at predictable locations. Several simplifications to the model are considered, and their validity is investigated analytically over a range of parameters.

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“…The work in [18] includes and deals with various types of gap sensors for magnetic bearings but without any specific structure for the sensors.…”

Section: Introductionmentioning

confidence: 99%

Innovative Differential Hall Effect Gap Sensor through Comparative Study for Precise Magnetic Levitation Transport System

Lee¹,

Park²,

Park³

et al. 2016

Journal of Sensor Science and Technology

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Three types of gap sensors, a capacitive gap sensor, an eddy current gap sensor, and a Hall effect gap sensor are described and evaluated through experiments for the purpose of precise gap sensing for micrometer scale movement, and a novel type of differential hall effect gap sensor is proposed. Each gap sensor is analyzed in terms of resolution and environment dependency including temperature dependency. Furthermore, a transport system for AMOLED deposition is introduced as a typical application of gap sensors, which are recently receiving considerable attention. Based on the analyses, the proposed differential Hall effect gap sensor is found to be the most suitable gap sensor for precise gap sensing, especially for application to a transport system for AMOLED deposition. The sensor shows resolution of 0.63 mV/µm for the overall range of the gap from 0 mm to 2.5 mm, temperature dependency of 3 µm/°C from 20°C to 30°C, and a monotonic characteristic for the gap between the sensor and the target.

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Sensors For Magnetic Bearings

Cited by 15 publications

References 0 publications

A Review Note on Different Components of Simple Electromagnetic Levitation Systems

A Review Note on Different Components of Simple Electromagnetic Levitation Systems

On the nonlinear electromagnetic coupling between a coil and an oscillating magnet

Innovative Differential Hall Effect Gap Sensor through Comparative Study for Precise Magnetic Levitation Transport System

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