Abstract
The double H-coil method was proposed to detect magnetic field strength on the surface of a specimen more accurately than the single H-coil method. In this paper, the distribution of magnetic field strength inside exciting coil of a single sheet tester (SST) is measured simultaneously by the single H-coil method using four separated H-coils. They are placed at different distances from the surface of the specimen and thereby enable us to evaluate the influence of the position of the H-coil on the measurement accuracy of magnetic properties. As a result, it was revealed that the magnetic field strength and specific total loss increase linearly as the distance of the H-coil from the surface of the specimen increases. However the increasing rate of the specific total loss is smaller than that of the magnetic field strength and within the range of required measurement reproducibility.
Highlights
When measuring magnetic properties of magnetic materials by means of a single sheet tester (SST), an H-coil method is used for detecting magnetic field strength
In order to evaluate the influence of the position of the H-coil on the measurement accuracy of magnetic properties, we discuss the relationships of d with the magnetic field strength Hb and the specific total loss Ps, where Hb is the magnetic field strength at the instant of the maximum flux density Bm in each symmetric loop
The double H-coil method is effective for the measurement of magnetization properties of Febased amorphous strip as well as electrical steel sheets because it can estimate the surface magnetic field strength more accurately
Summary
When measuring magnetic properties of magnetic materials by means of a single sheet tester (SST), an H-coil method is used for detecting magnetic field strength. The magnetic field distribution near a specimen in the SST was investigated to evaluate the influence of the position of the H-coil on the measurement accuracy of magnetic properties. The necessity of double H-coil method in measuring specific total loss as well as magnetization properties by the SST was discussed. In order to evaluate the influence of the position of the H-coil on the measurement accuracy of magnetic properties, we discuss the relationships of d with the magnetic field strength Hb and the specific total loss Ps, where Hb is the magnetic field strength at the instant of the maximum flux density Bm in each symmetric loop
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