Design and Low-Cost Implementation of an Optimally Robust Reduced-Order Rotor Flux Observer for Induction Motor Control
Alonge, F.
D'Ippolito, F.
Giardina, G.
Scaffidi, T.
Univ. di Palermo, Palermo;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec. 2007
Volume: 54,
Issue: 6
On page(s): 3205-3216
ISSN: 0278-0046
INSPEC Accession Number: 9692640
Digital Object Identifier: 10.1109/TIE.2007.905632
Current Version Published: 2007-11-12
Abstract
The aim of this paper is to design and analyze reduced-order observers of the rotor flux of induction motors. The design is carried out in two steps. In the first step, a boundary of the stability region of the observation error is obtained corresponding to a chosen Lyapunov function. In the second step, the boundary is translated into a performance index that is minimized with respect to stator and rotor resistance variations and differences of voltages supplying the motor and those supplying the observer in order to obtain the largest stability region. Implementation of the observer on a low-cost fixed-point digital signal processor using look-up tables is described. Experimental results are shown with reference to a prototype consisting of a simple proportional-integral controller, the proposed observer, and a 2.2-kW induction motor; the implementations of both the controller and the observer are carried out on a DS1104 dSpace microcontroller using the fixed-point option.
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