DocumentCode :
789707
Title :
Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification
Author :
Holtz, Joachim ; Quan, Juntao
Author_Institution :
Electr. Machines & Drives Group, Wuppertal Univ., Germany
Volume :
38
Issue :
4
fYear :
2002
Firstpage :
1087
Lastpage :
1095
Abstract :
The performance of vector-controlled induction motor drives without a speed sensor is generally poor at very low speed. The reasons are offset and drift components in the acquired feedback signals, voltage distortions caused by the nonlinear behavior of the switching converter, and the increased sensitivity against model parameter mismatch. New modeling and identification techniques are proposed to overcome these problems. A pure integrator is employed for stator flux estimation which permits high-estimation bandwidth. Compensation of the drift components is done by offset identification. The nonlinear voltage distortions are corrected by a self-adjusting inverter model. A further improvement is a novel method for online adaptation of the stator resistance. Experiments demonstrate smooth steady-state operation and high dynamic performance at extremely low speed.
Keywords :
DC-AC power convertors; control system analysis; control system synthesis; feedback; induction motor drives; invertors; machine testing; machine theory; machine vector control; parameter estimation; velocity control; control design; control performance; control simulation; drift components compensation; dynamic performance; feedback signals; induction motors; low-speed sensorless vector control; model parameter mismatch sensitivity; nonlinear inverter model; offset; parameter identification; self-adjusting inverter model; stator flux estimation; steady-state operation; switching converter; voltage distortions; Feedback; Induction motor drives; Induction motors; Inverters; Machine vector control; Nonlinear distortion; Parameter estimation; Stators; Switching converters; Voltage;
fLanguage :
English
Journal_Title :
Industry Applications, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-9994
Type :
jour
DOI :
10.1109/TIA.2002.800779
Filename :
1019966
Link To Document :
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