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An algorithm for the selection of a method for the modelling of direct-on-line starting of cage induction motors from finite supplies

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Arneaud, John Michael (1995) An algorithm for the selection of a method for the modelling of direct-on-line starting of cage induction motors from finite supplies. PhD thesis, University of Tasmania.

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Abstract

The objective of the study was the derivation of an algorithm for the selection of a
numerical simulation method for the direct-on-line starting of induction motors from
power supplies whose voltage and frequency may vary during the simulation period.
A major part of the work consisted of an evaluation of methods for treating the
variation of motor parameters under different conditions and the relative effect of
these variations on predicted output. Two new methods were introduced for
predicting the variation of leakage reactance with current and a new method was
developed for deriving the rotor parameter variation with slip for bars of arbitrary, but
known, cross-section.
An existing method was modified to derive model parameters from manufacturer's
quoted performance data. The results are given of an investigation into the effect on
the derived parameters and consequently on the predicted performance, of allowing
the quoted performance data to vary within the tolerances permitted by Australian
Standard 1359.
A set of descriptive measures for simulation output were defined. This enabled the
motor's starting performance to be quantified in terms of a small number of variables.
The factorial method of experimental design was used to calculate relative coefficients
of performance. These related the effect of changes in program input data to the
resultant variation in program output and thus allowed numerical measures to be
placed on the significance of data uncertainty and model complexity as they affected
the simulated performance.
PC-based data acquisition and processing techniques were used to take measurements
from two laboratory motors which confirmed the results of numerical simulation
work.
The broad general conclusion of the thesis was that in most situations, the total
system data needs to be included in the model if the uncertainty is to be improved
beyond that obtainable with simple non-recursive calculations. An expert system shell
was used to present an algorithm for the selection of a method of modelling
appropriate to the quality of the data, the type of system, the purpose of the study and
the availability of computational tools.

Item Type: Thesis (PhD)
Keywords: Electric motors, Induction, Electric motors, Induction
Copyright Holders: The Author
Copyright Information:

Copyright 1995 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D.)--University of Tasmania, 1996. Includes bibliographical references

Date Deposited: 25 Nov 2014 00:46
Last Modified: 07 Jun 2016 05:03
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