As a monograph on motor testing technology, this book comprehensively introduces the testing methods, calculation and analysis of test data, compilation of test report, analysis and judgment of performance data (especially unqualified data) of various common motors (including AC single-phase and three-phase motors and generators, DC motors and generators, etc.). ), as well as the basic and general knowledge of motor testing, the selection and construction of testing equipment, the configuration and use of testing and measuring circuits and instruments. The appendix at the back of the book provides a lot of technical data, standards and other materials related to the above contents. The contents of this book are all from the field practice of production and repair, and the relevant standards adopted are the latest versions up to 20 10 and 10, which are operable and advanced. This book can be used as a reference for workers and technicians engaged in motor repair and testing, and can also be used as a training material for related majors.