Permanent Magnet Synchronous and Brushless DC Motor Drives: 1st Edition (Hardback) book cover

Permanent Magnet Synchronous and Brushless DC Motor Drives

1st Edition

By Ramu Krishnan

CRC Press

611 pages | 309 B/W Illus.

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Hardback: 9780824753849
pub: 2009-09-25
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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.

Table of Contents

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


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

About the Author

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.

Subject Categories

BISAC Subject Codes/Headings:
TECHNOLOGY & ENGINEERING / Electronics / General