Some remarks concerning the measurement of the ferromagnetic losses under non-sinusoidal conditions

✍ Scribed by Andrei Ţugulea

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 592 KB
• Volume: 12
• Category: Article
• ISSN: 1430-144X
• DOI: 10.1002/etep.4450120202

✦ Synopsis

Abstract

The present standards concerning the measurement of the losses in ferromagnetic media, namely the IEC publications 404‐2 (1978), 404‐;3 (1982) and 404–10 (1988), refer only to the magnetic flux densities between 1 T and 1.85 T, if the magnetic sheets are grain oriented, and 1 T and 1.5 T if the magnetic sheets are nonoriented. The time variation of the magnetic fluxes must be almost sinusoidal at industrial frequencies of 50 Hz or 60 Hz and medium frequencies between 400 Hz and 10,000 Hz. In the above‐mentioned standards there are no references concerning the measurement of losses under non‐sinusoidal conditions. The paper deals with some theoretical aspects concerning the power‐flows under non‐sinusoidal time variation of the electromagnetic fields. The theoretical conclusions are applied to the study of the losses in ferromagnetic media. It is shown that new norms or standards are necessary. Some practical suggestions are given at the end.