摘要:

Eddy-current effects in thick steel plates are investigated with particular reference to saturation. TheB/Hcharacteristic is represented by the Frohlich equationB=H/(a + bH). The field equations are expressed in nondimensional form, and the losses are computed using a numerical finite-difference scheme. The information is presented in the form of a loss chart which embodies the effects of thickness, conductivity, frequency, shape of the saturation curve and magnetic-field strength. Information is also given in the paper about the penetration depth and power factor. The calculations are compared with measurements on steel blocks.

DOI:10.1049/piee.1970.0171

出版商:IEE    

年代:1970

数据来源: IET

摘要:

Measurements of total power loss and domain spacing have been made on individual grains of varying size in grain-oriented silicon iron at various frequencies (20–150 Hz) at 1.5 Wb/m2, using recently developed experimental techniques, Minimum total power loss occurs in 0.013 in (0.033cm) thick material at a grain size of about 0.7cm. In the grains studied, the walls followed a simple bar arrangement and moved smoothly without jerks, and repetitively, over approximately the same distances, the equilibrium wall spacing was independent of the frequency. The relevance of these results to explanations of the anomalous loss based on domain-wall models is discussed.

DOI:10.1049/piee.1970.0172

出版商:IEE    

年代:1970

数据来源: IET