Even in the 21st century electric drives continue to be widely used in the industry. Since the first edition was published fifteen years ago, researchers have been actively exploring the potential of electric motors. Recent advances in computers have led to the development of technologies that streamline the process of designing and controlling electric motors. Electric drives are often utilised due to their many benefits. One of these benefits is the ability to regulate speed precisely and in a variety of ways, particularly with a dc drive. The thyristor has allowed for the regulation of electric motor speed. Both the static and dynamic characteristics of these drives have been enhanced via optimisation and automation. More recent advancements in the field of static apparatus control, including converters and inverters employing thyristors, have made these drives more dependable and precise in operation, leading to their expanded use. The book provides an exhaustive and comparative study of all drives, both conventional and those fed from static converters. It also discusses the utility of static drives for these applications.