**Summary:** This book provides a comprehensive overview of permanent magnet (PM) synchronous and brushless DC motor drives. It covers the fundamentals of PMs, their characteristics, and the design and control of PM synchronous and brushless DC machines. The book is divided into three parts: Part I introduces PMs, machines, and converters, Part II focuses on PM synchronous machines and their control, and Part III discusses PM brushless DC machines and their control. The first chapter introduces PMs, their demagnetization characteristics, and the operating point of magnets. It explains the relationship between magnetic field intensity and flux density, and how these factors influence the performance of PM machines. The chapter also discusses the demagnetization characteristics of PMs, including the remanent flux density, coercive force, and the recoil line. The second chapter covers power devices, inverters, and their control. It discusses various power devices such as diodes, MOSFETs, and IGBTs, their switching characteristics, and losses. The chapter also introduces inverters, their switching schemes, and the concept of four-quadrant operation. Part II of the book focuses on PM synchronous machines and their control. It discusses the dynamic modeling of PM synchronous machines, vector control, and various control strategies for PM synchronous machines. The chapter also covers flux-weakening operation, which is crucial for extending the speed range of PM synchronous motor drives. Part III of the book discusses PM brushless DC machines and their control. It covers the modeling and simulation of PM brushless DC machines, commutation torque ripple, and phase advancing. The chapter also discusses half-wave PMBDCM drives, C-dump topologies, and variable dc link converter topologies. The book also includes chapters on the design of current and speed controllers, sensorless control of PMBDCM drives, and special issues such as torque smoothing, parameter sensitivity, and fault diagnosis. The book concludes with an index and references. The book is written for engineers with a bachelor's degree in electrical engineering and is suitable for a one-semester advanced course in motor drives. It provides a systematic approach to the analysis and design of PM motor drives, with a focus on control strategies and low-cost converter topologies. The book includes MATLAB simulations and examples to illustrate the concepts discussed.**Summary:** This book provides a comprehensive overview of permanent magnet (PM) synchronous and brushless DC motor drives. It covers the fundamentals of PMs, their characteristics, and the design and control of PM synchronous and brushless DC machines. The book is divided into three parts: Part I introduces PMs, machines, and converters, Part II focuses on PM synchronous machines and their control, and Part III discusses PM brushless DC machines and their control. The first chapter introduces PMs, their demagnetization characteristics, and the operating point of magnets. It explains the relationship between magnetic field intensity and flux density, and how these factors influence the performance of PM machines. The chapter also discusses the demagnetization characteristics of PMs, including the remanent flux density, coercive force, and the recoil line. The second chapter covers power devices, inverters, and their control. It discusses various power devices such as diodes, MOSFETs, and IGBTs, their switching characteristics, and losses. The chapter also introduces inverters, their switching schemes, and the concept of four-quadrant operation. Part II of the book focuses on PM synchronous machines and their control. It discusses the dynamic modeling of PM synchronous machines, vector control, and various control strategies for PM synchronous machines. The chapter also covers flux-weakening operation, which is crucial for extending the speed range of PM synchronous motor drives. Part III of the book discusses PM brushless DC machines and their control. It covers the modeling and simulation of PM brushless DC machines, commutation torque ripple, and phase advancing. The chapter also discusses half-wave PMBDCM drives, C-dump topologies, and variable dc link converter topologies. The book also includes chapters on the design of current and speed controllers, sensorless control of PMBDCM drives, and special issues such as torque smoothing, parameter sensitivity, and fault diagnosis. The book concludes with an index and references. The book is written for engineers with a bachelor's degree in electrical engineering and is suitable for a one-semester advanced course in motor drives. It provides a systematic approach to the analysis and design of PM motor drives, with a focus on control strategies and low-cost converter topologies. The book includes MATLAB simulations and examples to illustrate the concepts discussed.