“…During the last two decades many different reluctance rotor configurations have been considered in order to improve output power and efficiency of these type of motors [2][3][4]. Recently, a number of international research groups (Department of Engineering Science, Oxford University, UK; Cambridge University, UK; Moscow State Aviation Institute, Russia; Institut fuer Physikalische Hochtechnologie, Jena, Germany; Institute de Ciencia de Materials de Barcelona, Bellaterra, Spain; CTS-UNINOVA, Caparica, Portugal and also in USA and Japan), have explored the possibility of using high temperature superconducting (HTS) materials in the construction of hysteresis and reluctance electrical machines using bulk yttrium-bariumcopper oxide elements (known as YBCO) placed in the rotor.…”