Flux Waveform Control in Electrical Steels Using Digital Feedback Technique

Abstract:

There are increasing calls for more accurate power loss measurements in electrical steels. This paper presents the flux controlling technique in electrical steels using digital feedback technique. The various parameters that affect the measuring efficiency have also been analyzed. Digital feedback technique is used since it has the advantages of good reproducibility of the waveform due to ease of calibration and its stability with respect to time as well as reduces human error. Furthermore, it has no oscillation of the control system compared to the analog feedback technique. This technique was designed by using Simulink, MATLAB R12, Version 6.0. The digital feedback circuitry, which has been designed, is proved to be successful where the output waveform is a sinusoidal waveform of 50Hz. It is shown that the harmonic component increases as the distortion factor increases. It also indicates that the average distortion factor for nth harmonic to the distorted waveform is typically less than 1.5 and meaningful measurements can be performed.

• Periodical: Key Engineering Materials (Volumes 306-308)
• Pages: 881-886
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.306-308.881
• Online since: March 2006
• Authors: Aisyah Hartini Jahidin, Fitri Pearlratna Hamzah, Wan Nor Liza Wan Mahadi
• Keywords: Digital Feedback Control, Electrical Steel, Flux Waveform, Single Sheet Tester

References

[1] F.T. Hamzah: One-Dimensional Flux Waveform Control in Electrical Steels Using Digital Feedback Technique (Thesis, University of Malaya, Malaysia).

[2] G. Bertotti, E. Ferrara, F. Fiorillo, and M. Pasquale: Loss Measurements On Amorphous Alloys Under Sinusoidal And Distorted Induction Waveform Using A Digital Feedback Technique (J. Apply. Phys. Vol 73, No 10, 1993, pg 5357-5377).

DOI: 10.1063/1.353735

[3] M. Enokizono, and T. Todaka, Flux Distributions in Three-Phase Induction Motor with Disconnection Problem (IEEE Trans Magn. Vol 29, No 6, Nov 1993, pg 3165-3167).

DOI: 10.1109/20.281124

[4] M. Mubin: Assessment of Sensors in Magnetic Measurement under One Dimensional Magnetization (in Transverse Direction) (Thesis, University of Malaya, Malaysia).

[5] ASTM: Standard Test Methods for Alternating-magnetic Properties of Materials at Power Frequencies using Sheet-Type Specimen, Annual Book of ASTM Standards, Vol 03. 04, no A804/A804M-93, (1994).

[6] T. Yamaguchi and K. Matsubara: A New Method of Controlling Flux Waveform Based on Microcomputer Composition of Excitation Function (Trans IEE of Japan, Part A, Vol 104, no 4, 1984, p.230).

DOI: 10.1541/ieejfms1972.104.230

[7] K. Matsubara, N. Takahashi, K. Fujiwara, T. Nakata, M. Nakano and H. Aoki: Acceleration Technique of Waveform Control for Single Sheet Tester, (IEEE Trans Magn. Vol 131, No 6, Nov 1995, pg 3400-3402).

DOI: 10.1109/20.490395