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Additional info for 33.Magnetics
25 in) solid ferrite tile at 0Њ and 45Њ incident angles. t = a + 1−g g 1 + − 2 a a 0 and impedance and propagation constant [for details, see (3,6,16a)]. Figure 1 shows the reflectivity of a solid ferrite tile and the material properties are given in Table 1. The figure shows that the tile performs very well below 600 MHz, but above 600 MHz, the tile performance deteriorates. The higher frequency (Ͼ600 MHz) performance is improved by using so-called ‘‘ferrite grids’’. A ferrite grid (or waffle) is shown in Fig.
Mat. Eng. Performance, 1 (2): 236–244, 1992. 12. Y. Alinejad-Beromi A. J. Moses T. Meydan New aspects of rotating ﬁeld and ﬂux measurement in electrical steel, J. Magn. Mag. , 112: 135–138, 1992. 13. A. J. Moses Effect of stresses on magnetic properties of siliconiron laminations. J. Mat. , 9: 217–222, 1974. 14. A. J. Moses P. S. Phillips Some effect of stress in Goss-oriented silicon iron, IEEE Trans. , 14: 353–355, 1978. 15. D. A. Ball H. O. Lorch An improved thermometric method of measuring local power dissipation, J.
2 Eddy Current Losses Figure 3. Deterioration of power loss and permeability of grainoriented silicon steel with direction of magnetization relative to the rolling direction. Figure 1. Variation of properties of iron alloys with silicon content. Figure 2. Schematic representation of grain-oriented electrical steel sheet. P. Goss). 2% silicon by weight. A crucial factor in developing good magnetic properties is to control the impurity level during the steel production process. Certain impurities such as manganese sulﬁde (MnS) or aluminum nitride (AlN) are needed in the development of the (110) texture so they must be removed in a subsequent anneal.