This textbook provides foundational knowledge with numerous detailed calculation examples to facilitate understanding of the material. For engineers in the field of drive technology development, basic knowledge of the operating behavior of direct current, three-phase asynchronous, and synchronous machines, as well as transformers, is essential. Additionally, knowledge of electromagnetic-mechanical energy conversion is helpful. The presentation of the theoretical foundations has been simplified to achieve easy comprehension. The 5th edition has been updated to include efficiency classes for converters and drive systems, as well as the topic of synchronous reluctance machines.