Title :
Three-mode variable structure control for a pulse-density modulated current feedback amplifier
Author :
Hung, J.Y. ; Nelms, R.M. ; Xia, F. ; Story, M.
Author_Institution :
Dept. of Electr. Eng., Auburn Univ., AL, USA
Abstract :
Design, implementation, and testing results of a variable structure controlled pulse density modulated current feedback amplifier are presented. The current amplifier is part of an industrial magnetic bearing digital control system, which uses a floating-point digital signal processor for levitation control of the bearing rotor. The signal processor is capable of very high sample rates and the amplifier control algorithm is very simple to program, so the entire controller (levitation control, state estimation, and amplifier control) is implemented on a single processor
Keywords :
digital control; digital signal processing chips; electric current control; feedback amplifiers; floating point arithmetic; machine bearings; magnetic devices; pulse modulation; resonant power convertors; rotors; state estimation; state feedback; variable structure systems; amplifier control algorithm; bearing rotor; current feedback amplifier; digital control system; floating-point digital signal processor; industrial magnetic bearing; integrator backstepping; levitation control; pulse-density modulation; resonant DC link amplifier; state estimation; state feedback; three-mode variable structure control; Digital control; Digital signal processors; Electrical equipment industry; Feedback amplifiers; Industrial control; Magnetic levitation; Magnetic variables control; Pulse amplifiers; Pulse modulation; Testing;
Conference_Titel :
Industrial Electronics, 1995. ISIE '95., Proceedings of the IEEE International Symposium on
Conference_Location :
Athens
Print_ISBN :
0-7803-7369-3
DOI :
10.1109/ISIE.1995.497277
