Abstract
Unstable behavior during scanning induction heating of continuously moving through single-turn inductor magnetic steel strip has been studied on computer model. The instability is reflected in striped heating or zebra-effect, i.e. either hot strip coming from the inductor with a red glow (temperature above the Curie point) or dark strip below Curie point, alternating regularly. I.e., the Curie isotherm undergoes discontinuities on the surface in the longitudinal section of the strip. The instability is caused by power loss density localization in the non-magnetic zone heated over Curie temperature. This phenomenon was confirmed experimentally by heating magnetic steel plate, and also in the experiment with a thin-walled tube, where an edge-effect was avoided. The domain of instability occurrence and its parameters have been determined. The results can be used to ensure a uniform heating temperature when designing induction heating systems for strips of magnetic steel in a longitudinal magnetic field.
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