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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1562

Authors: Sintayehu, Challa
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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