Fundamentals of Electrical Machines

This accessible textbook offers a clear and concise introduction to the core principles of electric machines, focusing on the conversion of energy through mechanical power, electrical power, torque, magnetic fields, and rated voltage.

Covering the key processes behind electric machine theory, including mechanics and electromagnetism, Fundamentals of Electrical Machines enables readers to develop a systematic view of the technology. Including case studies with industry examples, the book is both theoretical and practical. Chapters cover topics such as basic concepts of electrical machines and transformers, electromagnetism, asynchronous machines, and synchronous machines. It also details DC machines and includes revision questions to help self-guided learning.

This book will be of interest to students in electrical engineering and engineers in all fields interested in electromechanical systems.

Professor Ants Kallaste serves as a Tenured Associate Professor at Tallinn University of Technology (TalTech), Estonia, where he has devoted his career to the research, development, and teaching of electrical machines and drive systems. As the head of the Electrical Machine Group (EMG) within the Department of Electrical Power Engineering and Mechatronics, his work focuses on advancing innovative and sustainable technologies in electrical engineering.

His academic and research efforts are centered around the design, diagnostics, and optimization of electrical machines. Over the past decade, he has led projects ranging from the development of low- and medium-power radial flux machines to the creation of a 3 MVA ring generator for wind turbine applications. These research activities reflect his deep commitment to integrating sustainable energy solutions with high-performance engineering systems.

A significant portion of his research also explores diagnostic methodologies for electrical machines. He has investigated rotor and stator fault detection in induction machines, developed pre-diagnostic tools using mobile devices, and examined the application of inverse problem theory for early fault recognition. This work is aimed at improving machine reliability while reducing lifecycle costs and environmental impact.

An emerging area of his research is additive manufacturing in electrical machine design. By incorporating 3D printing into engineering workflows, Professor Kallaste aims to revolutionize how electrical machines are conceptualized and produced, enabling more sustainable and flexible manufacturing processes.

Alongside his research, he has made substantial contributions to academic publishing, authoring numerous scientific articles on robust design optimization, energy-efficient drive systems, and environmental assessments of motor lifecycles. He actively participates in the international research community, serving as a co-chair or committee member at conferences and maintaining collaborations with both industry and academic partners.

Professor Kallaste remains passionate about educating the next generation of engineers. He believes that a solid foundation in electrical machine theory, coupled with practical experience and openness to innovation, is key to advancing the field and addressing global challenges related to energy efficiency and sustainability. His ongoing work continues to bridge rigorous engineering research with practical solutions that benefit both industry and society.

Toomas Vaimann is a Research Professor at Tallinn University of Technology (TalTech), Estonia, where he has dedicated his career to the advancement of electrical engineering, with a particular focus on electrical machines, diagnostics, and condition monitoring. His academic journey reflects a steadfast commitment to research excellence and engineering education.

At TalTech, he holds a leading role within the Electrical Machines Research Group, which is part of the Department of Electrical Power Engineering and Mechatronics. In this capacity, he has played a pivotal role in guiding research initiatives on the calculation, modeling, control, testing, and development of electrical machines, including motors, generators, and transformers. The group also provides expert consultations and fosters research collaborations that contribute to the progress of electrical engineering.

Professor Vaimann’s research spans a wide spectrum, including diagnostics and condition monitoring of electrical machines, additive manufacturing applications in electrical engineering, and the development of digital twins for propulsion drives in autonomous electric vehicles. His scholarly output includes numerous peer-reviewed publications and has received significant citation recognition, attesting to the impact of his work.

In addition to his research, he has assumed leadership positions within the academic community. Notably, he served as Program Director for Energy Conversion and Control Systems at TalTech, where he was responsible for aligning academic programs with evolving industry demands and technological advancements. He has also contributed to the professional engineering community through his role as Secretary of the IEEE Estonia Section, supporting knowledge exchange and professional development.

His commitment to sharing knowledge extends beyond academia, as demonstrated by his keynote addresses at international conferences, where he presents innovative approaches to fault detection and other cutting-edge topics. Professor Vaimann remains focused on advancing the field of electrical engineering through research, collaboration, and mentoring the next generation of professionals to navigate a rapidly evolving technological landscape.

Kuno Janson has dedicated his professional life to the advancement of electrical engineering education and research. His academic career has been closely associated with Tallinn University of Technology (TalTech), Estonia, where he served for many years as an Associate Professor in the School of Engineering before being honored with the title of Associate Professor Emeritus.

Throughout his extensive teaching career, Professor Janson instructed a wide range of courses, including Elektrimasinad (Electrical Machines) at the bachelor’s level, Transpordivahendite elektromehaanika (Electromechanics of Transport Vehicles) at the master’s level, and advanced doctoral-level courses such as Elektrotehnika erikursus II (Special Course in Electrical Engineering II). His work also extended to distance learning and vocational education, consistently supporting accessible and impactful technical education.

Recognizing the importance of flexible learning, he collaborated with colleagues to create e-learning versions of key courses. These resources, made available through Estonia’s national e-learning platform Moodle, have expanded access to engineering education across the country and beyond.

His research has been primarily focused on electrical machines and power systems, with a special emphasis on sustainable energy solutions. Much of his work addressed real-world challenges relevant to Estonia’s unique geographical and infrastructural context.

In addition to teaching and research, Professor Janson has made significant contributions to educational literature. He has co-authored multiple textbooks and technical learning materials aimed at enhancing the quality of engineering education.

Throughout his career, he remained committed to deepening the understanding of electrical engineering among students and colleagues. His legacy includes not only his scholarly and instructional contributions but also his enduring impact on the development of Estonia’s engineering education and the preparation of future generations of engineers.