An online identification method for both stator-and rotorresistances of induction motors without rotational transducers
In-Joong Ha
Sang-Hoon Lee
Sch. of Electr. Eng., Seoul Nat. Univ.;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug 2000
Volume: 47,
Issue: 4
On page(s): 842-853
ISSN: 0278-0046
References Cited: 12
CODEN: ITIED6
INSPEC Accession Number: 6685870
Digital Object Identifier: 10.1109/41.857964
Current Version Published: 2002-08-06
Abstract
This paper describes an effective online method for identifying
both stator and rotor resistances, which is useful in robust speed
control of induction motors without rotational transducers. The
identification method for stator resistance is derived from the
steady-state equations of induction motor dynamics. On the other hand,
the identification method for rotor resistance is based on the linearly
perturbed equations of induction motor dynamics about the operating
point. The identification method for both stator and rotor resistances
uses only the information of stator currents and voltages. It can
provide fairly good identification accuracy regardless of load
conditions and be easily incorporated into any sensorless speed
controller proposed in the prior literature. Some experimental results
are presented to demonstrate the practical use of the identification
method. A sensorless speed control system has been built for
experimental work, in which all algorithms for identification and
control are implemented on a digital signal processor. The experimental
results confirm that the proposed method allows for high-precision speed
control of commercially available induction motors without rotational
transducers
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