電力用磁性材料の標準磁気特性試験法

概要

論文の詳細を見る
Standard test methods for measurement of magnetic properties of power magnetic materials are described. As one of the principal power magnetic materials, electrical steel sheet is used for magnetic circuits in various electrical machines. The Epstein tester is generally used to evaluate this material's magnetic properties because it has been used for a long time and the design theory was established based on an enormous amount of data measured by the Epstein tester. If the measured data are applied to precise evaluation of magnetic properties, however, the Epstein tester may be inadequate because of the configuration of the specimen and the method for calculating magnetic field strength by means of the magnetizing current method using a constant effective magnetic path length. As an alternative, a single sheet tester (SST) using the H-coil method was developed in Japan in the early 1970s. The SST can provide the nearly uniform magnetization of a wide region, and the H-coil method can directly estimate the magnetic field strength on the surface of the specimen. Therefore, the SST is favourable for preparing a database of magnetic properties for advanced design of magnetic circuits. In electrical machines, structural steels are also used for brackets, bolts, supporting jigs, and so on. The specimen for structural steel is solid in general, and the SST cannot be applied. For a solid specimen, the permeameter was conceived. However, the electromagnet is very convenient because of its higher excitation and simpler preparation of the specimen. Recently the magnetic properties of electrical steel sheet under applied stress have been discussed for accurate estimates of core losses, aiming at higher efficiency. As the relationship between mechanical and magnetic properties should be measured, more sophisticated measuring techniques are required.
社団法人日本磁気学会の論文
2004-05-01

電力用磁性材料の標準磁気特性試験法

スポンサーリンク

概要

著者

関連論文

スポンサーリンク