DocumentCode :
2250504
Title :
Application of nonlinear observers for rotor position detection on an induction motor using machine voltages and currents
Author :
Cuzner, Robert M. ; Lorenz, Robert D. ; Novotny, Donald W.
Author_Institution :
Wisconsin Univ., Madison, WI, USA
fYear :
1990
fDate :
7-12 Oct. 1990
Firstpage :
416
Abstract :
The principles and operation of a unique, terminal properties-based speed and position sensing approach for induction machines are demonstrated. A closed-loop nonlinear observer is proposed which uses an analytical model to calculate, in real time, the mechanical states of rotor speed and position given the torque command to the system and the induction motor terminal voltages and line currents. The uniqueness of this observer is that it uses inherent machine magnetic saliency and winding asymmetry to develop a magnetic encoder model of the machine itself. The error between the measured and calculated spatial harmonic EMFs is then used to drive the observer to accurate position and speed estimates in the presence of model parameter errors. Experimental data are included which show harmonic flux terms identified, measured and compared with an analytical model using a slip-ring induction motor with the rotor windings open and short circuited.<>
Keywords :
State estimation; harmonics; induction motors; position measurement; rotors; state estimation; velocity measurement; DC motor; Motorola 56000 DSP system; encoder; harmonic flux terms; induction motor; inherent machine magnetic saliency; machine currents; machine voltages; magnetic encoder model; mechanical states; nonlinear observers; real time; rotor position detection; rotor speed; short-circuited windings; slip-ring induction motor; tachometer; winding asymmetry; Analytical models; Induction machines; Induction motors; Machine windings; Magnetic flux; Observers; Real time systems; Rotors; Torque; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
Type :
conf
DOI :
10.1109/IAS.1990.152219
Filename :
152219
Link To Document :
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