The Fault-Tolerant Control of Induction Motors / Mykhaylo V. Zagirnyak.

Format:

Book

Author/Creator:

Zagirnyak, Mykhaylo V., author.

Series:

Electrical engineering developments series.

Electrical Engineering Developments Series

Language:

English

Subjects (All):

Electric motors, Induction--Automatic control.

Electric motors, Induction.

Fault tolerance (Engineering).

Physical Description:

1 online resource (300 pages)

Edition:

First edition.

Place of Publication:

New York : Nova Science Publishers, Inc., [2022]

Summary:

"At present, variable-frequency, positional and tracking electric drives (ED), which perform controlled convesion of electric energy into the energy of mechanical motion of working bodies, are the main executive part of the automation systems of industrial mechanisms, machines and technological facilities. The scope of variable-frequency EDs is rather large: from high-power electric engineering to various areas of utilities and household devices. The use of variable-frequency ED makes it possible to reduce electricity consumption by 20-50% due to the application of mechanisms in which the motors are designed for maximum load, and the average daily load is 60-80%. At the same time, the operating conditions of motors and mechanisms in general are improved due to the exclusion of dynamic shocks, starting overloads and current limitations Thus, the use of variable-frequency ED allows creating an efficient energy-saving technology, the use of which enables not only saving electricity but also increasing the service life of the equipment. However, despite the simplicity and efficiency of modern variable-frequency ED systems, their proper functioning depends on the reliable operation of the motor, the three-phase off-line voltage invertor and the control system, as each of these components may malfunction. Electric motor malfunctions are the most significant share of the variable-frequency ED faults. The most essential percentage of IM failures is caused by the damage in the stator power circuit. In most cases, such a damage develops gradually and eventually results in the complete failure of the electric machine. That is, IM operates for a long time with a damage in the early stages of its development. Such operating modes are characterized by the fact that the system does not lose its operability, but the indicators of the control quality significantly worsen. The energy efficiency of the energy conversion process deteriorates; the energy losses essentially increase and variable components of electromagnetic torque and active power consumption appear. Long operation of ED systems in such modes results in the further development of defects, and, ultimately, in the complete failure of the electric machine, which may cause accidents. The termination of ED systems operation due to the above problems, on the one hand, and the ever-increasing trend of expanding the scope of variable-frequency ED with an IM in industry, on the other hand, turns the issue of their reliability and fault tolerance into the problem of paramount importance. The timely detection and elimination of IM damage in the early stages of their development can extend the technological equipment life and reduce the financial losses caused by unforeseen shutdown of the equipment due to technological failure or failure of IM. Thus, fault-tolerant control systems (FTC) are of particular interest. They are capable of detecting various types of damage at the initial stage and promptly adapt the control law in such a way as to preserve the ED operability for a long period of time until the possibility of IM repair or replacement occurs. That is, the most efficient use of the FTC system is industrial equipment, which should continue to operate despite the deterioration of dynamic performance and energy efficiency"-- Provided by publisher.

Contents:

Intro

Contents

Preface

Acknowledgments

Abbreviations List

Main Symbols

Chapter 1

The Analysis of Induction Motor Damages and the Methods for Their Compensation by Means of a Variable-Frequency Electric Drive

1.1. The Trends of Development of General Industrial AC Variable-Frequency Electric Drives

1.2. The Analysis of the Causes for the Deterioration of the Operation Efficiency of the Variable-Frequency Electric Drive

1.3. The Analysis of the Prerequisites for Improving the Control Methods and Enhancing the Efficiency of VFED with Asymmetric IM

1.4. The Analysis of Typical Damages to Power Electric Circuits of Variable-Frequency ED

1.4.1. Heat Loads

1.4.2. Electrical Loads

1.4.3. Mechanical Loads

1.4.4. The influence of Environmental Factors

1.5. The Review of the Existing Methods for the Control of IM with a Damage to the Stator Power Circuit

Conclusion

Chapter 2

Mathematical Modeling of the Systems of a Variable-Frequency Electric Drive

2.1. The Implementation of the Power Unit of a Variable-Frequency AC Electric Drive with a Frequency Converter

2.2. Mathematical Modeling of Alternating Current Electric Drive Systems with Vector Control

2.3. A Mathematical Model of an Inductions Motor with Asymmetric Stator Windings

2.4. The Assessment of the Operation Modes of the Variable-Frequency Electric Drive with a Vector Control

2.4.1. The Assessment of Losses in the Power Part of the Variable-Frequency ED

2.4.2. The Assessment of Variable Components of Power Consumption and Electromagnetic Torque of IM

Chapter 3

The Correction of the Operation Modes of Induction Motors with Stator Asymmetrical Windings during Scalar Control

3.1. The Development of a System to Compensate for the Impact of IM Asymmetry by Means of VFED.

3.1.1. The Development of a Method for Compensating for the Influence of a Three-Phase IM Asymmetry by Means of VFED

3.1.1.1. The Compensation for the Variable Components of IM Instantaneous Power

3.1.2. Mathematical Modeling of the Developed System of Compensation for the Influence of the Asymmetry of Three-Phase Loading by Means of VFED

3.1.2.1. Modeling the Operation of VFED with the System of Compensation for the Influence of the Asymmetry of Three-Phase Active-Inductive Loading

3.1.2.2. Modeling of VFED Operation with the System of Compensation for the Influence of IM Asymmetry

3.2. The Assessment of the Stator Phase Asymmetry Influence on IM Service Life

3.3. The Research of the Losses in the Power Semiconductor Keys of the Autonomous Voltage Inverter with the Compensation for IM Asymmetry Influence

3.4. The Calculation of the Voltage Regulator in the System of Compensation for IM Asymmetry Influence by Means of VFED

3.5. The Calculation of the Recommended Loading Level of an Asymmetric Induction Motor

Chapter 4

The Correction of the Operation Modes of Induction Motors with Stator Asymmetrical Windings during Vector Control

4.1. The Compensation for the Variable Component of the Electromagnetic Torque of an Induction Motor

4.2. The Compensation for the Variable Component of the Consumed Active Power of the Induction Motor

4.3. Phase Vector Control System for an Induction Motor with Asymmetric Stator Windings

4.3.1. The Theoretical Bases of the use of the Phase Control Systems for Asymmetric Motors

4.3.2. The Features of Creating the Systems of IM Phase-by-Phase Control

4.3.3. The Adjustment of the Phase Control System to Compensate for the Variable Component of IM Electromagnetic Torque.

4.3.4. The Adjustment of the Phase Control System to Compensate for the Variable Component of IM Power Consumption

Chapter 5

The Determination of the Parameters of Induction Motors during Operation with a Frequency Converter

5.1. The Analysis of the Methods for the Identification of the Electromagnetic Parameters of the Induction Motor in the Start-up Period

5.1.1. The Stator Resistance

5.1.2. The Stator Inductive Reactance

5.1.2.1. Method 1 [218]

5.1.2.2. Method 2 [214]

5.1.2.3. Method 3 [219]

5.1.2.4. Method 4 [161]

5.1.2.5. Method 5 [220]

5.1.3. The Inductance of the Magnetization Circuit

5.1.3.1. Method 1 [217]

5.1.3.2. Method 2 [220]

5.1.3.3. Method 3 [161]

5.1.4. Rotor Resistance

5.1.4.1. Method 1 [221]

5.1.4.2. Method 2 [222]

5.1.4.3. Method 3 [222]

5.1.4.4. Method 4 [219]

5.1.4.5. Method 5 [161]

5.1.4.6. Method 6 [220]

5.2. The Assessment of Induction Motor Parameters Based on the Low Frequency Sinusoid Test Effects

5.3. The Systems for Measuring the Electrical Parameters of the Variable-Frequency Electric Drive

5.4. The Experimental Verification of the System of the Assessment of the Parameters of the Induction Motor in the Pre-Start Period

5.5. The Influence of the Signal Amplitude and Phase Errors on the Determination of Induction Motor Electromagnetic Parameters

Chapter 6

The Development of the Methods for the Indirect Determination of the Energy Characteristics of IM Operation and the Improvement of the Economic Efficiency of the Induction Motor Stock Operation

6.1. The Quantitative Assessment of the Error of the Calculation of the Active Instantaneous Power of Three-Phase Systems in the Serial Poll of ADC of Voltage and Current Channels.

6.2. The Assessment of the Energy Indicators of the Operation of Variable-Frequency Electric Drives on the Basis of Current and Voltage Instantaneous Values

6.3. Working out a Method for the Improvement of the Economic Efficiency of the Operation of Variable-Frequency Electric Drive Induction Motors

References

About the Authors

Index

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Notes:

Description based on publisher supplied metadata and other sources.

Description based on print version record.

Includes bibliographical references and index.

Other Format:

Print version: Zagirnyak, Mykhaylo V. The Fault-Tolerant Control of Induction Motors

ISBN:

9798886973020

OCLC:

1349310176