Title :
A switching controller for a magnetic bearing
Author :
Steffani, Hans Friedrich ; Hofmann, Wilfried
Author_Institution :
Dept. of Electr. Machines & Drives, Tech. Univ. Chemnitz, Germany
Abstract :
This paper presents a sliding-mode controller for magnetic bearings. The experimental setup is a 72 kW, 250 kg induction motor for a turbo-fan. It is shown that such a controller, for which the output drives the switches directly, needs a lower switching-frequency than a conventional PD-position controller with an underlying PI-current-control and a pulse width modulation
Keywords :
control system synthesis; electric current control; induction motors; machine bearings; magnetic devices; pulse width modulation; stability; switching; two-term control; variable structure systems; 250 kg; 72 kW; PI-current-control; current driven bearings; induction motor; levitating system stability; lower switching-frequency; magnetic bearing; pulse width modulation; sliding-mode controller; switching controller; turbo-fan; voltage driven bearings; Control systems; Current control; Induction motors; Magnetic levitation; Magnetic switching; Pulse width modulation; Sliding mode control; Space vector pulse width modulation; Switches; Voltage control;
Conference_Titel :
Industrial Electronics, Control and Instrumentation, 1997. IECON 97. 23rd International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-3932-0
DOI :
10.1109/IECON.1997.671026
