The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Computer control for 2-axis magnetic suspension system
Author:	Chen, Jian
View Online:	njit-etd1991-092 (viii, 68 pages ~ 1.5 MB pdf)
Department:	Department of Electrical and Computer Engineering
Degree:	Master of Science
Program:	Electrical Engineering
Document Type:	Thesis
Advisory Committee:	Friedland, Bernard (Committee chair) Meyer, Andrew Ulrich (Committee member) Chang, Timothy Nam (Committee member)
Date:	1991-12
Keywords:	Magnetic suspension -- Automatic control Computerized instruments
Availability:	Unrestricted
Abstract:	A two-axis magnetic suspension system. using linear-potentiometer position sensing and DC solenoids, controlled digitally by a 80386 microcomputer has been built and operated in our laboratory. Control algorithms obtained by combining the full-state feedback control law with two methods of estimating velocities are studied. One method uses a nonlinear reduced-order observer; the other uses a finite difference algorithm. The nonlinear reduced-order observer performs better in simulation but the difference algorithm takes less calculation time and is used in the implementation. The system has been operated successfully to suspend weights up to 1.2 lb. and to get a slant angle more than 10 degrees. Stable operation is achieved at sampling rates as low as 100HZ.