| 摘要 |
PURPOSE:To make the titled apparatus compact, by exciting a material to be inspected by applying AC current different in phases to a plurality of coils to generate rotary magnetic flux. CONSTITUTION:Coils 41, 42 are arranged in a state crossed at an appropriate angle and an insert orifice 43 for inserting a material 1' to be inspected through the crossing region. The one ends 41b, 42b and the other ends 41c, 42c of windings 41a, 42a are connected, for example, by the supply terminals 5a, 5b, 5c of a three-phase AC power source 5. When an AC current is supplied to the coils 41, 42, rotary magnetic flux is generated and the material 1' to be inspected is subjected to desired excitation. A probe 6 outputs a signal required in the flaw detection of the material 1' to be inspected and this signal is sent to a predetermined signal treating apparatus to perform flaw detection. By this method, because rotary magnetic flux is generated in a fixed state, the freeness degree of a magnetic flaw detection apparatus from the standpoint of planning can be made large and the apparatus itself can be constituted in a compact form. |
