Control of Induction Motors
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Table of contents
- Cover
- CONTENTSvii
- Prefacexi
- Chapter 1. Background1
- 1.1 Induction Motors1
- 1.2 Drive Systems with Induction Motors3
- 1.3 Common Loads4
- 1.4 Operating Quadrants10
- 1.5 Scalar and Vector Control Methods11
- 1.6 Summary12
- Chapter 2. Construction and Steady-State Operation of Induction Motors15
- 2.1 Construction15
- 2.2 Revolving Magnetic Field17
- 2.3 Steady-State Equivalent Circuit24
- 2.4 Developed Torque27
- 2.5 Steady-State Characteristics31
- 2.6 Induction Generator36
- 2.7 Summary40
- Chapter 3. Uncontrolled Induction Motor Drives43
- 3.1 Uncontrolled Operation of Induction Motors43
- 3.2 Assisted Starting44
- 3.3 Braking and Reversing47
- 3.4 Pole Changing51
- 3.5 Abnormal Operating Conditions52
- 3.6 Summary54
- Chapter 4. Power Electronic Converters for Induction Motor Drives55
- 4.1 Control of Stator Voltage55
- 4.2 Rectifiers56
- 4.3 Inverters64
- 4.4 Frequency Changers69
- 4.5 Control of Voltage Source Inverters71
- 4.6 Control of Current Source Inverters85
- 4.7 Side Effects of Converter Operation in Adjustable Speed Drives88
- 4.8 Summary91
- Chapter 5. Scalar Control Methods93
- 5.1 Two-Inductance Equivalent Circuits of the Induction Motor93
- 5.2 Open-Loop Scalar Speed Control (Constant Volts/Hertz)97
- 5.3 Closed-Loop Scalar Speed Control101
- 5.4 Scalar Torque Control102
- 5.5 Summary105
- Chapter 6. Dynamic Model of the Induction Motor107
- 6.1 Space Vectors of Motor Variables107
- 6.2 Dynamic Equations of the Induction Motor111
- 6.3 Revolving Reference Frame114
- 6.4 Summary117
- Chapter 7. Field Orientation119
- 7.1 Torque Production and Control in the DC Motor119
- 7.2 Principles of Field Orientation121
- 7.3 Direct Field Orientation124
- 7.4 Indirect Field Orientation126
- 7.5 Stator and Airgap Flux Orientation129
- 7.6 Drives with Current Source Inverters134
- 7.7 Summary135
- Chapter 8. Direct Torque and Flux Control137
- 8.1 Induction Motor Control by Selection of Inverter States137
- 8.2 Direct Torque Control140
- 8.3 Direct Self-Control148
- 8.4 Space-Vector Direct Torque and Flux Control155
- 8.5 Summary157
- Chapter 9. Speed and Position Control159
- 9.1 Variables Controlled in Induction Motor Drives159
- 9.2 Speed Control161
- 9.3 Machine Intelligence Controllers164
- 9.4 Position Control173
- 9.5 Summary175
- Chapter 10. Sensorless Drives177
- 10.1 Issues in Sensorless Control of Induction Motors177
- 10.2 Flux Calculators179
- 10.3 Speed Calculators183
- 10.4 Parameter Adaptation and Self-Commissioning191
- 10.5 Commercial Adjustable Speed Drives197
- 10.6 Summary200
- Literature203
- Glossary of Symbols221
- Index225
This book is a comprehensive reference source for practicing engineers and students specializing in electric power engineering and industrial electronics. It will illustrate the state of the art in induction motors. Beginning with characteristics and basic dynamic models of induction motors, and progressing to low- and high- performance drive systems. The book will be rich in useful information, without an excessive mathematical burden. Computer simulations resulting in mock oscillograms of physical quantities are used for illustration of basic control concepts.
The content of this book is divided into three basic parts: 1) control-oriented description of induction motors, 2) control methods, and systems, 3) control means. An induction motor is presented as an electromechanical power converter, and basic relations between the electrical, magnetic and mechanical quantities in the motor will be explained. Control methods and systems will be classified according to the controlled variables(torque, speed, flux), actuating variables(voltage, current), and dynamic performance (uncontrolled, low-performance, and high-performance). An overview of power electronic converters and information processing equipment used in the modern induction motor drives is included. Such systematic approach will give the readers a comprehensive overview of the field of induction motor control.
The content of this book is divided into three basic parts: 1) control-oriented description of induction motors, 2) control methods, and systems, 3) control means. An induction motor is presented as an electromechanical power converter, and basic relations between the electrical, magnetic and mechanical quantities in the motor will be explained. Control methods and systems will be classified according to the controlled variables(torque, speed, flux), actuating variables(voltage, current), and dynamic performance (uncontrolled, low-performance, and high-performance). An overview of power electronic converters and information processing equipment used in the modern induction motor drives is included. Such systematic approach will give the readers a comprehensive overview of the field of induction motor control.