**About the Editor**

**S ´ergio Cruz** (Ph.D.) received his E.E. diploma and M.Sc. and Dr.Eng. degrees in electrical engineering from the University of Coimbra, Coimbra, Portugal, in 1994, 1999, and 2004, respectively. He is currently an Associate Professor and the Director of the Electric Machines Laboratory at the Department of Electrical and Computer Engineering, University of Coimbra. His teaching and research interests include power transformers, rotating electric machines, electric drives, and power electronic converters, with special emphasis on fault diagnosis, fault tolerance, and digital control.
