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Rotating electrical machines are embedded in nearly every sector of modern industry; they are widely used in industrial settings, as motors in transportation applications—including electric vehicles—and in power generation, where they are a key component of wind turbines. Technical advances are transforming what these machines can achieve. New developments in rotating electrical machinery have arisen from novel or improved materials, including new insulation materials, as well as advances in electrical steels and high-performance permanent magnets, and more rapid mass production techniques. These improvements deliver benefits such as cheaper and faster manufacturing and enhanced performance from the final products. At the same time, condition monitoring and maintenance techniques are also changing rapidly through increased application and further research and development, and are becoming essential ensuring reliability, availability and cost-effectiveness for electrical machine systems, from small industrial drives to multimegawatt generators. Condition Monitoring of Rotating Electrical Machines has established itself as a comprehensive work for researchers and engineers in the energy, transport, process engineering and manufacturing industries and in related academic research. Coverage includes fundamental principles of condition monitoring, plus in-depth discussion of reliability, signal processing, online temperature, chemical and vibration monitoring, current, flux and power monitoring, partial discharge detection, drive monitoring, off-line monitoring, condition-based maintenance, use of AI and machine learning, and safety and training. This 4th Edition has been expanded, revised and updated throughout, and features new chapters, addressing novel machine designs, new materials, clean energy and transport, the use of AI, and strategies for reliability, availability and maintenance. The electrical machine is one of the most fundamental yet subtle of human engineering innovations. It uses an electro-magnetic field to transfer energy from one system to another, from electrical power to rotational mechanical torque and vice versa, using rotating machine technology, transistors, power switches and quantum electronics to make variable speed operations possible. However, from the end of nineteenth century to 2000, the power-toweight ratios of electrical machines were extraordinarily low, and our book will explain this conundrum. The condition monitoring of electrical machine plant has increased in importance as engineering processes are automated, while plant supervision and manpower are reduced. Electrical machines have traditionally been thought to be reliable, requiring little attention, except at infrequent intervals, when a plant is shut down for inspection. In fact, the application of fast-acting, digital protective relays for electrical machine control has reduced the attention operators pay to this equipment. Modern developments, however, since 2000 have led to the development of machines with gradually increasing power-to-weight ratios, using improved electrical steels, conductor and insulation materials. This change continues progressively and will eventually raise the power–weight performance of electrical machines. Electrical machines are at the heart of most industrial processes, designed to tighter margins and power-to-weight ratios, with increasing demands for machine performance and process reliability. The control of electrical machines by variable speed drives, using sophisticated means to vary supply voltages, currents and speeds, is also facilitating increased plant performance. Both fixed and variable speed applications rely upon condition monitoring for improved control. This book is an updated guide to the development and availability of these machine monitoring techniques.