Detalhes Tese: Tese (doutorado) - Universidade Nacional Chungbuk: Engenharia Elétrica (W) 2011
Introduction 1.1 Background
In order to reduce the consumption of electrical energy, increasing the efficiency of electrical machines and apparatus is an effective way. Furthermore, the fast development of high efficient electrical drive systems also requires machines having high power densities, wide speed ranges, and high efficiencies, such as permanent synchronous machines, brushless DC machines, and induction machines. There are several ways to increase the efficiency and to reduce the losses in these machines. One important part of the total loss is the iron loss, which occur in the magnetic core in the machines. In field weakening operation of machines, iron loss will become the major part of the total loss. Therefore, it is important to calculate the iron loss accurately. From the physical viewpoint, any change in magnetization of magnetic materials is caused by the movement of magnetic domain walls [1]-[3]. From the viewpoint of engineering, an empirical approach to calculate the iron loss is separating the iron losses into three parts: hysteresis loss, eddy current loss and anomalous loss [4]-[14]. The hysteresis loss corresponds to the energy needed to overcome the pinning of domain wall.
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