Hitachi Elevator Engineering & Service Co., Ltd.

Sadayuki Hori

Yutaka Hirama

Kenzoh Takahashi

An electromagnetic inspecting apparatus for electromagnetically detecting a defect present in a magnetizable wire rope moving in its longitudinal direction is disclosed. The apparatus comprises a first magnetic pole disposed opposite to the elongate magnetic member, a second magnetic pole having a polarity different from that of the first magnetic pole and disposed opposite to the elongate magnetic member at a position spaced apart by a predetermined distance from the first magnetic pole in the longitudinal direction, a detecting core disposed opposite to the magnetizable wire rope at a position intermediate between the first and second magnetic poles, a detecting coil wound around the detecting core to make a differential response to flows of leakage flux appearing due to the presence of a defect in the magnetizable wire rope thereby generating an electrical output signal indicative of the result of its response, and a yoke magnetically coupling the first and second magnetic poles and the detecting core at the portions remote from the elongate magnetic member.

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Tokyo, Japan

Sadayuki Hori