Three-phase drive technology explained simply. A textbook with numerous illustrations, application examples, and exercises. The three-phase motor is by far the most commonly used motor in drive technology. Without knowledge of electrical power supply, its correct electrical connection, energy-efficient operation, and the possibilities for its control and/or regulation with additional components such as soft starters or frequency converters, practical application cannot succeed. The three-phase asynchronous motor is initially described as the user sees it in operation, with its external specifications, construction, and connection to the power grid. In this context, energy efficiency aspects, which hold great significance against the backdrop of normative and legal requirements, are also a central focus of the theoretical considerations.