Permanent Magnet Synchronous and Brushless DC Motor Drives

Unlike most books on machine drives, Permanent Magnet Synchronous and Brushless DC Motor Drives provides comprehensive treatment of control and low cost converter topologies. After an introduction to machines, power devices, inverters, and control, this book presents detailed coverage of pm synchronous machines, including modeling, implementation, control strategies, flux weakening operations, parameter sensitivity, sensorless control, and intelligent control applications. Subsequent chapters address the simulation, control, inverters topologies, and commutation torque ripple of pm brushless dc motor drives. MATLAB codes are also included throughout the text where appropriate.

Despite two decades of massive strides in research and development on control strategies and their subsequent implementation, most books on permanent magnet motor drives still focus primarily on motor design, providing only elementary coverage of control and converters. Addressing that gap with information that has largely been disseminated only in journals and at conferences, Permanent Magnet Synchronous and Brushless DC Motor Drives is a long-awaited comprehensive overview of power electronic converters for permanent magnet synchronous machines and control strategies for variable-speed operation. It introduces machines, power devices, inverters, and control, and addresses modeling, implementation, control strategies, and flux weakening operations, as well as parameter sensitivity, and rotor position sensorless control. Suitable for both industrial and academic audiences, this book also covers the simulation, low cost inverter topologies, and commutation torque ripple of PM brushless DC motor drives. Simulation of the motor drives system is illustrated with MATLAB® codes in the text. This book is divided into three parts—fundamentals of PM synchronous and brushless dc machines, power devices, inverters; PM synchronous motor drives, and brushless dc motor drives. With regard to the power electronics associated with these drive systems, the author: Explores use of the standard three-phase bridge inverter for driving the machine, power factor correction, and inverter control Introduces space vector modulation step by step and contrasts with PWM Details dead time effects in the inverter, and its compensation Discusses new power converter topologies being considered for low-cost drive systems in PM brushless DC motor drives This reference is dedicated exclusively to PM ac machines, with a timely emphasis on control and standard, and low-cost converter topologies. Widely used for teaching at the doctoral level and for industrial audiences both in the U.S. and abroad, it will be a welcome addition to any engineer’s library.

PART I: Introduction to Permanent Magnets and Machines and Converters and Control Chapter 1 Permanent Magnets and Machines Permanent Magnets Arrangement of PMs Magnetization of PMs PM ac Machines Fundamentals of Synchronous Machines Fundamental Synchronous Machine Relationships Core Losses Resistive Losses Initial Machine Design Cogging Torque Basic Types of PMSMs Based on Flux Paths Vibration and Noise Chapter 2 Introduction to Inverters and Their Control Power Device DC Input Source DC to ac Power Conversion Real Power Reactive Power Need for Inverter Control Pulse Width Modulation Hysteresis Current Control Space Vector Modulation Inverter Switching Delay Input Power Factor Correction Circuit Four-Quadrant Operation Converter Requirements PART II: Permanent Magnet Synchronous Machines and Their Control Chapter 3 Dynamic Modeling of Permanent Magnet Synchronous Machines Real-Time Model of a Two-Phase PMSM Transformation to Rotor Reference Frames Three-Phase to Two-Phase Transformation Zero Sequence Inductance Derivation Power Equivalence Electromagnetic Torque Steady-State Torque Characteristics Models in Flux Linkages Equivalent Circuits Per Unit Model Dynamic Simulation Small-Signal Equations of the PMSM Evaluation of Control Characteristics of the PMSM Computation of Time Responses Space Phasor Model Chapter 4 Control Strategies for a Permanent Magnet Synchronous Machine Vector Control Derivation of Vector Control Drive System Schematic Control Strategies Chapter 5 Flux-Weakening Operation Maximum Speed Flux-Weakening Algorithm Direct Flux Weakening Parameter Sensitivity Model-Free (Parameter-Insensitive) Flux-Weakening Method Six-Step Voltage and Constant Back EMF Control Strategies for PMSM Direct Steady-State Evaluation Flux Weakening in SMPM and IPM Synchronous Machines Chapter 6 Design of Current and Speed Controllers Current Controller Speed Controller Chapter 7 Parameter Sensitivity and Compensation Introduction Parameter Compensation through Air Gap Power Feedback Control Parameter Compensation by Reactive Power Feedback Control Chapter 8 Rotor Position Estimation and Position Sensorless Control Current Model Adaptive Scheme Sensing by External Signal Injection Current Model-Based Injection Scheme Position Estimation Using PWM Carrier Components PART III: Permanent Magnet Brushless DC Machines and Their Control Chapter 9 PM Brushless DC Machine Modeling of PM Brushless DC Motor Normalized System Equations The PMBDCM Drive Scheme Dynamic Simulation Chapter 10 Commutation Torque Ripple and Phase Advancing Commutation Torque Ripple Phase Advancing Dynamic Modeling Chapter 11 Half-Wave PMBDCM Drives Split Supply Converter Topology C-Dump Topology Variable DC Link Converter Topology Variable Voltage Converter Topology with Buck-Boost Front-End Chapter 12 Design of Current and Speed Controllers Transfer Function of Machine and Load Inverter Transfer Function Transfer Functions of Current and Speed Controllers Current Feedback Speed Feedback Design of Controllers Chapter 13 Sensorless Control of PMBDCM Drive Current Sensing Position Estimation Chapter 14 Special Issues Torque Smoothing Parameter Sensitivity of the PMBDCM Drive Faults and Their Diagnosis Vibration and Noise

R. Krishnan is a professor of electrical and computer engineering at Virginia Tech, Blacksburg, USA, and the director of the Center for Rapid Transit Systems, specializing in linear and rotating motor drives. He is the author of Switched Reluctance Motor Drives (CRC Press), among other books, and his inventions have been prominently featured in radio, TV, and newspapers such as The Wall Street Journal. He has served as a consultant for 18 companies in the United States and has received best paper prize awards from the IEEE Industry Applications Society’s Industrial Drives Committee and the Electric Machines Committee, and Industrial Electronics Society. An IEEE Fellow, Professor Krishnan was awarded the Mittelman Award for outstanding achievement in industrial electronics from that society. He is a founder of two companies involved in variable speed motor drives, and he is a co-founder of a linear motor drives company.