DocumentCode :
1448684
Title :
Sensorless position control of induction motors-an emerging technology
Author :
Holtz, Joachim
Author_Institution :
Wuppertal Univ., Germany
Volume :
45
Issue :
6
fYear :
1998
fDate :
12/1/1998 12:00:00 AM
Firstpage :
840
Lastpage :
851
Abstract :
Concepts for the sensorless position control of induction motor drives rely on anisotropic properties of the machine rotor. Such anisotropies can be incorporated as periodic variations of magnetic saliencies in various ways. The built-in spatial anisotropy is detected by injecting a high-frequency flux wave into the stator. The resulting stator current harmonics contain frequency components that depend on the rotor position. Models of the rotor saliency serve to extract the rotor position signal using phase-locked loop techniques. A different approach makes use of the parasitic effects that originate from the discrete winding structure of a cage rotor. It has the merit of providing high spatial resolution for incremental positioning without sensor. The practical implementation of sensorless position identification and of a high-accuracy position control system are reported
Keywords :
control system analysis; control system synthesis; induction motor drives; machine control; machine theory; parameter estimation; position control; rotors; anisotropic properties; cage rotor; discrete winding structure; emerging technology; high-frequency flux wave injection; incremental positioning; induction motor drive; machine rotor; periodic magnetic saliencies variations; phase-locked loop techniques; sensorless position control concepts; sensorless position identification; stator current harmonics; Anisotropic magnetoresistance; Frequency; Induction motor drives; Magnetic anisotropy; Magnetic flux; Perpendicular magnetic anisotropy; Phase locked loops; Position control; Rotors; Stators;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/41.735327
Filename :
735327
Link To Document :
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