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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
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Thesis - Computer Engineering >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/123456789/1562
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| Title: | MAGNETIC LEVITATION ON A STEEL BALL |
| Authors: | Sintayehu, Challa |
| Advisors: | PROFESSOR GIRMA MULLISA |
| Copyright: | 2007 |
| Date Added: | 22-Oct-2008 |
| Publisher: | Addis Ababa University |
| Abstract: | Magnetic levitation has evolved into an important consideration in designing systems
requiring low losses due to friction and low energy consumption. Applications range from
high-speed rail transportation systems to various industrial applications (e.g., magnetic
bearings). Magnetism and closed-loop control system are the secrets to making an object
float in mid- air.
This thesis will involve the design and implementation of a Magnetic levitation device
appropriate to be included as hardware implementation in Control Systems.
In this thesis a magnetic levitation on a steel ball and its control are designed and
implemented. An infrared emitter and detector are mounted as light transmitter and light
receiver for creating an invisible beam for the control circuit. As the magnetic attraction
causes the ball to rise towards the coil, the ball begins to block the beam. The control circuit
uses feedback from infrared detector (from receiver) to adjust the coil current to keep the
object precisely centered in the infrared beam. The phase lead compensator control circuit is
designed so that equilibrium is reached where the magnetic attraction force exactly balances
the force of gravity pulling on the ball. The ball then remains perfectly suspended below the
coil with no visible means of support.
This Magnetic levitation system will aim to provide a means for students to gain insights into
and develop analysis and design techniques appropriate for such a system. |
| Description: | thesis submitted to the School of Graduate Studies of Addis Ababa University in partial
fulfillment of the Degree of Masters of Science in Electrical and Computer Engineering
(CONTROL ENGINEERING STREAM) |
| URI: | http://hdl.handle.net/123456789/1562 |
| Appears in: | Thesis - Computer Engineering
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