Abstract
Rotational core loss of the silicon steel laminations are measured under elliptical rotating excitation. The core loss decomposition model is very important in magnetic core design, in which the decomposition coefficients are calculated through the measurement data. By using the transformation of trigonometric function, the elliptical rotational magnetic flux can be decomposed into two parts along two directions. It is assumed that the rotating core loss is the sum of alternating core losses along rolling and transverse directions. The magnetic strength vector H of non-grain oriented (NGO) silicon steel 35WW270 along rolling and transverse directions is measured by a novel designed 3-D magnetic properties tester. Alternating core loss along the rolling, transverse directions and rotating core loss in the xoy-plane of this specimen in different frequencies such as 50 Hz, 100 Hz, and 200 Hz. Experimental results show that the core loss model is more accurate and useful to predict the total core loss.
Highlights
Silicon steel laminations are widely used in design and manufacture of power transformer and electrical machines
In order to increase efficiency of equipments, prediction of the core loss is a key factor in obtaining the optimum design of electrical machines
Core loss calculation and prediction are limited through the relationship description of magnetic flux density B and magnetic field strength H
Summary
Silicon steel laminations are widely used in design and manufacture of power transformer and electrical machines. In order to increase efficiency of equipments, prediction of the core loss is a key factor in obtaining the optimum design of electrical machines. Magnetic properties of NGO silicon steels 35WW270 are measured by a novel 3-D magnetic properties tester in different frequencies.[2] the 3-D excitation structure consists of three orthogonal C-shaped cores, six multilayer excitation coils which are wound around the core poles. In order to calculate and analyze the core loss in detail, a series of B-H loops of the specimen have been measured systematically along the rolling and the transverse directions over wide frequency range, such as 50 Hz, 100 Hz, and 200 Hz. The rolling direction (x axis) and transverse direction (y axis) of the specimen are shown, respectively The rolling direction (x axis) and transverse direction (y axis) of the specimen are shown in Fig. 2, respectively
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