Modern Permanent Magnet Electric Machines: Theory and Control

"High energy density permanent magnets (PM) and development of power electronics gave the beginning of PM brushless machine era since the late 1980s. Although, induction motors are now the most popular electric motors, the impact of PM brushless machines on electromechanical drives is significant. Nowadays, PM machines are on the second place after induction machines. Replacement of electromagnetic field excitation system by PMs brings the following benefits: No electrical energy is absorbed by the field excitation system and thus there are no excitation losses that means substantial increase in efficiency; Higher power density (kW/kg) and/or torque density (Nm/kg) than when using electromagnetic excitation; Better dynamic performance than motors with electromagnetic excitation (higher magnetic flux density in the air gap); Simplification of construction and maintenance; Reduction of prices for some types of machines. The book is intended to serve as a textbook for undergraduate Power Engineering students in order to supplement and enlarge knowledge in fundamentals of magnetism, soft magnetic materials, permanent magnets (PMs), calculation of magnetic circuits with PMs, modern PM brushed DC machines and their control, modern PM brushless DC motors and drive control and modern PM generators. It can supplement the knowledge in Electrical Machines or serve as a prescribed textbook for teaching elective undergraduate course "Modern Permanent Magnet Electrical Machines". Since the book is written in a simple scientific language and without redundant mathematics, it can also be used by practicing engineers and managers employed in electrical machinery or electromagnetic device industries"--