ABSTRACT
SENSORLESS DIRECT FIELD ORIENTED CONTROL OF
INDUCTION MACHINE
BY FLUX AND SPEED ESTIMATORS USING MODEL
REFERENCE ADAPTIVE SYSTEM
This work focuses on an observer design which will estimate flux-linkage and
speed for induction motors in its entire speed control range. The theoretical base of
the algorithm is explained in detail and its both open-loop, and closed-loop
performance is tested with experiments, measuring only stator current and voltage.
Theoretically, the field-oriented control for the induction motor drive can be
mainly categorized into two types / indirect and direct field oriented. The field to be
oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented
control, the slip estimation based on the measured or estimated rotor speed is
required in order to compute the synchronous speed. There is no need for the flux
estimation in such a system. For the direct field oriented case the synchronous speed
is computed with the aid of a flux estimator. In DFO, the synchronous speed is
iv
computed from the ratio of dq-axes fluxes. With the combination of a flux estimator
and an open-loop speed estimator one can observe stator-rotor fluxes, rotor-flux
angle and rotor speed. In this study, the direct (rotor) flux oriented control system
with flux and-open-loop speed estimators is described and tested in real-time with
the Evaluation Module named TMS320LF21407 and the Embedded Target software
named Vissim from Visual Solutions Company.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12604965/index.pdf |
| Date | 01 April 2004 |
| Creators | Simsek, Gunay |
| Contributors | Ersak, Aydin |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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