An Improved Method for Measuring the Magnetic Properties of Silicon Steel With Double Sheets at High Frequency

Single sheet tester (SST) is a traditional method for measuring magnetic properties of silicon steel. In order to make the measurement more accurate, this paper presents an improved SST with double yokes and double sheets. The electromagnetic simulation demonstrates that the magnetic field strength H between the two sheets that are in symmetric magnetic path approximately equal to H of two sheets, proving that the improved SST has higher test accuracy than the traditional double-yoked SST. A novel control method is proposed for the measurement system to make sure the symmetry of magnetic path. In this experiment, the magnetic field strength H and the magnetic flux density B of the tested samples are measured by an induction coil method, and the maximum working frequency of this apparatus can be up to 20 kHz.