Table Of ContentENERGY SCIENCE, ENGINEERING AND TECHNOLOGY
T D
HE IAGNOSTICS OF
I M B
NDUCTION OTOR ROKEN
R B B
OTOR ARS ON THE ASIS OF
E
THE LECTROMOTIVE
F A
ORCE NALYSIS
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E S , E
NERGY CIENCE NGINEERING
T
AND ECHNOLOGY
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ENERGY SCIENCE, ENGINEERING AND TECHNOLOGY
T D
HE IAGNOSTICS OF
I M B
NDUCTION OTOR ROKEN
R B B
OTOR ARS ON THE ASIS OF
E
THE LECTROMOTIVE
F A
ORCE NALYSIS
MYKHAYLO V. ZAGIRNYAK
ZHANNA IV. ROMASHYKHINA
AND
ANDRII P. KALINOV
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Library of Congress Cataloging-in-Publication Data
Names: Zagirnyak, Mykhaylo V., author.
Title: The diagnostics of induction motor broken rotor bars on the basis of the electromotive force
analysis / Mykhaylo V. Zagirnyak, Zhanna Iv. Romashykhina, and Andrii P. Kalinov (Kremenchuk
Mykhailo Ostrohradskyi National University 20, Pershotravneva ul, Kremenchuk, Ukraine).
Description: Hauppauge, New York : Nova Science Publishers, Inc., [2017] |
Series: Energy science, engineering and technology | Includes bibliographical references and index.
Identifiers: LCCN 2017045782 (print) | LCCN 2017055629 (ebook) | ISBN 9781536126846 (cid:3)(cid:11)(cid:72)(cid:37)(cid:82)(cid:82)(cid:78)(cid:12)| ISBN
9781536126839 (softcover)
Subjects: LCSH: Electric motors, Induction--Testing. | Electric machinery--Monitoring. | Fault location
(Engineering)
Classification: LCC TK2785 (ebook) | LCC TK2785 .Z34 2017 (print) | DDC 621.46--dc23
LC record available at https://lccn.loc.gov/2017045782
Published by Nova Science Publishers, Inc. † New York
CONTENTS
Preface vii
List of Abbreviations xi
List of Symbols xiii
Chapter 1 The Contemporary State of the Problem of the
Diagnostics of Induction Motor Broken Rotor
Bars 1
Chapter 2 Theoretical Foundation for the Research of
Induction Motor Broken Rotor Bars in the Self-
Running-Out Condition 25
Chapter 3 Mathematical Models for the Research of the
Method of Induction Motor Broken Rotor Bars
Diagnostics 69
Chapter 4 The Method of Induction Motor Broken Rotor
Bars Diagnostics with the Use of Wavelet-
Transform 105
vi Contents
Chapter 5 The Experimental Verification of the Method
for the Diagnostics of Induction Motor Broken
Rotor Bars 133
Conclusion 149
References 153
Appendices 163
Authors’ Contact Information 179
Index 181
PREFACE
Electric machines are known to be the basic elements of electric
drives of various operating mechanisms used in up-to-date industry and
economy. Induction motors with a squirrel-cage rotor, having
considerable advantages in comparison with other electric machines,
are commonly used in most operating mechanism electric drives
nowadays. Technological processes conditions often imply induction
motor operation at non-rated and asymmetric supply voltage, high
temperature, humidity, switching overvoltage, technological overloads,
etc. The mentioned factors predetermine premature aging of induction
motor units and reduce their service life.
According to statistics data, about 7–10% failures of industrial
induction motors occur due to broken rotor bars. Broken rotor bars are
found more often in an induction motor with a copper and brass rotor
winding than in an induction motor with an aluminum rotor winding.
Besides, broken rotor bars occur in rotors with a welded aluminum
winding more often than in cast rotors.
Broken bars of the rotor squirrel-cage winding cause the distortion
in the magnetic field in the induction motor air gap, increased vibration
of the motor, occurrence of the stator current pulsations in all phases,
increase of losses in the stator and rotor windings, reduction of rotation
viii M. V. Zagirnyak, Zh. Iv. Romashykhina and A. P. Kalinov
frequency under load, decrease of the efficiency. That is why timely
detection of the degree of breakage will allow one to avoid its
development, reduce the restoration time, decrease
the maintenance expenditure, reduce the equipment idle time, increase
the working efficiency of the motors and operating mechanisms.
Such researchers as: Douglas H., Marques С., Thomson W. T.,
Vaskovskii Yu. М., Rogozin G. G., Syvokobylenko V. F., Yatsun М.
А. et al. devoted a great number of papers to the development and
implementation of the methods and systems of the diagnostics of
broken rotor bars.
There exist various methods for diagnostics of induction motor
broken rotor bars. However, an analysis of the conventional diagnostics
methods revealed that most of them require the withdrawal of the
induction motor from the operating process and its disassembling.
There are methods of induction motor broken rotor bars diagnostics in
the operation mode, e.g., the methods of currents spectral analysis, the
analysis of zero-sequence voltage, the analysis of applied magnetic
field parameters. However, these methods do not provide satisfactory
results during the diagnostics in the idle mode and do not take into
consideration the supply mains low quality voltage and the load level
variation influence on the diagnostics results. Moreover, the use of
Fourier transform of current signals does not enable unambiguous
determination of the number and relative position of induction motor
broken rotor bars. Taking the above said into account, development of
the method for the diagnostics of induction motor broken rotor bars is
topical.
The presented monograph contains theoretical and experimental
research that made it possible to solve a topical scientific problem of
improvement of the efficiency of induction motor broken rotor bars
diagnostics by the wavelet-analysis of electromotive force in stator
windings in the mode of motor self-running-out.
The first chapter of the monograph contains an analysis of the
existing methods for the induction motor broken rotor bars diagnostics,
