A sensorless vector control system for induction motors usingq-axis flux with stator resistance identification
Tsuji, M.; Shuo Chen; Izumi, K.; Yamada, E.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 1, Feb 2001 Page(s):185 - 194
Digital Object Identifier 10.1109/41.904579
Summary:This paper presents a sensorless vector control system for
general-purpose induction motors, which is based on the observer theory
and the adaptive control theories. The proposed system includes a rotor
speed estimator using a q-axis flux and stator resistance identifier
using the d-axis flux. The advantages of the proposed system are
simplicity and avoidance of problems caused by using only a voltage
model. Since the mathematical model of this system is constructed in a
synchronously rotating reference frame, a linear model is easily derived
for analyzing the system stability, including the influence of the
observer gain, motor operating state, and parameter variations. In order
to obtain stable low-speed operation and speed control accuracy, an
algorithm for compensating for the deadtime of the inverter and
correcting the nonideal features of an insulated gate bipolar transistor
was developed. The effectiveness of the proposed system has been
verified by digital simulation and experimentation
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