Our transition towards a cleaner and more sustainable future has seen an increase in the use of electrical energy in the functioning of our society. This implies the need to develop tools and methods which allow us to study electromagnetic devices and ensure their functioning for as long as possible. This requires us to use these tools to understand their behavior, not just as one component, but also in the entire systems in which they can be found, throughout their life cycle. This book provides electrical engineering students and researchers with the resources to analyze how synchronous machines behave over their entire field of operation, particularly focusing on hybrid excited synchronous machines (HESMs). The field of HESMs, although not a fundamental problem in the strict sense of the term, provides answers to a range of fundamental problems: the flux weakening of permanent magnet machines, energy optimization, and lastly the increasing costs of rare-earths permanent magnets.
For 35,000 years ancient Afghanistan was called Aryana (the Light of God) has existed. Then in 747 AD what is today called Afghanistan became Khorasan (which means Sunrise in Dari) which was a much larger geographical area. In the middle of the nineteenth century the name Afghanistan, which means home of the united tribes, was applied originally by the Saxons (present day British) and the Russians. During the Great Games in the middle of nineteenth century, the Durand Line was created in 1893 and was in place until 1993. Saxons created the state of Afghanistan out of a geographical area roughly the size of Texas: in 1893 before which there were 10 million square kilometers, larger than the size of Canada, as means to act as a buffer zone between the Saxon-India & Tsarist-Russia and the Chinese.
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