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All conventional machines rely upon magnetic fields for the purpose of energy conversion. This book approaches the study of electric machines by directly dealing with the electromagnetic fields. Focusing on the terminal rather than on the internal characteristics of machines, the text characterizes the machine in term of coupled magnetic circuits rather than magnetic fields. It provides problem sets and numerical examples, addresses Park’s equations starting from winding functions, describes operation as a LCI motor drive, and presents synchronous machine transient simulation as well as voltage regulation. The author aims to provide a deeper understanding of complex electromechanical drives.