This book includes my lecture notes for electrical machines course. The book is divided to different learning parts • Part 1- Apply basic physical concepts to explain the operation and solve problems related to electrical machines. • Part 2- Explain the principles underlying the performance of three-phase electrical machines. • Part 3- Analyse, operate and test three-phase induction machines. • Part 4- Investigate the performance, design, operation, and testing of the three-phase synchronous machine.