Ferrous Floatation [Ask the experts]

In this issue of IEEE Control Systems Magazine, we invite Carl Knospe to respond to a query on magnetic levitation. He answers the question 'In my control systems textbook, one of the examples of feedback control is a magnetically levitated ball. An electromagnet above the ball is used to contr...

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Bibliographic Details
Published in:IEEE control systems 2008-06, Vol.28 (3), p.18-20
Main Author: Knospe, C.R.
Format: Magazinearticle
Language:English
Subjects:
Applied sciences
Coils
Computer science
control theory
systems
Control systems
Control theory. Systems
Electromagnetic forces
Electromagnets
Exact sciences and technology
Force control
Force sensors
Magnetic levitation
Motion control
Open loop systems
System testing
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Summary:In this issue of IEEE Control Systems Magazine, we invite Carl Knospe to respond to a query on magnetic levitation. He answers the question 'In my control systems textbook, one of the examples of feedback control is a magnetically levitated ball. An electromagnet above the ball is used to control its position. I have also seen a lab experiment of this kind advertised for sale. Is this just a neat toy or could it be used in a practical application? Why is a control system necessary? Couldn't levitation be achieved with only permanent magnets, which would use less power? Finally, are electromagnetic systems hard to control?'
ISSN:1066-033X
1941-000X
DOI:10.1109/MCS.2008.920951