Electric Drives provides a practical understanding of the subtleties involved in the operation of modern electric drives. The Third Edition of this bestselling textbook has been fully updated and greatly expanded to incorporate the latest technologies used to save energy and increase productivity, stability, and reliability.
ELECTRIC DRIVES. Ion Boldea S.A.Nasar 1998. 1. ENERGY CONVERSION IN ELECTRIC DRIVES. 1.1. ELECTRIC DRIVES - A DEFINITION. About 50% of electrical energy produced is used in electric drives today. Electric drives may run at constant speed (figure 1.1) or at variable speed (figure 1.2).
1. ENERGY CONVERSION IN ELECTRIC DRIVES 1.1. ELECTRIC DRIVES - A DEFINITION About 50% of electrical energy produced is used in electric drives today. Electric drives may run at constant speed (figure 1.1) or at variable speed (figure 1.2). Figure 1.1. Constant speed electric drive Electric Drives
1.2. APPLICATION RANGE OF ELECTRIC DRIVES A summary of main industrial applications and power range of electric drives is shown on figure 1.3. Figure 1.3. Electric drives - variable speed applications Electric Drives
Singular applications such as pumped - storage hydroelectric plants are now built for unit powers of 100MW or more. Traditionally for variable speed d.c. brush motors have been used for decades  but a.c. motors [2,3] are catching up lately (since 1990) as shown on figure 1.4. This radical shift is mainly due to the rapid progress in power electronic converters for a.c. motors . Figure 1.4. A.C. versus D.C. electric drives markets dynamics Electric Drives
JEE.RO volume 22 no.1, 2022 is here with a batch of 11 papers. Most of them deal with modern power electronics issues in electric drives and power systems and many of them contain experimental effort and validation. As you noticed the number of papers per issue has decreased in the two + years of Covid 19 and the recovery even in paper proposals has slowed down, unfortunately. We still have the publication open for free for authors and readers. Needless to say that we need more strong paper proposals in all the wide spectrum of subjects/sections of the contents, if possible/desirable with experimental validation. Besides being archived by COSMOS.com in Germany, www.jee.ro we are in the process of preparing for the introduction of our Journal in Scopus. For now, we thank the authors and reviewers who participated so far in the publication of www.jee.ro 2b1af7f3a8