The monograph explains the structure of DC and AC electrical machines, operation principles, theory, service and maintenance. Some separate chapters consider in details the electrical machines applied in automobiles, railway transport, electric public transport, air crafts and ships as well as represent typical for the transport electrical machines faults and defects, their reasons and prevention techniques and also features of these machines calculations. The textbook is directed to the alumni and students of professional education institutions as well as engineers and maintenance personnel. 344 pages.