| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a loop core for a flux gate current sensor insusceptible to a geomagnetism influence. <P>SOLUTION: The loop core for a flux gate current sensor includes: a pair of substantially E-shaped cores obtained by integrally aligning two plates bent into substantially U-shapes; and a soft magnetic interposing member having higher magnetic permeability than the pair of cores. The pair of cores are opposingly arranged such that respective first outer leg portions thereof abut on each other at least in part, respective second outer leg portions thereof abut on each other at least in part with the soft magnetic interposing member interposed therebetween, and a predetermined gap is maintained between each connected portion of two substantially U-shapes to form an annular loop contracted in the middle. The annular loop has a first ring portion for regulating a space to which an electric wire of a measurement target is inserted and passed on the side of the first outer leg portion, and has a second ring portion for regulating a space for arranging a magnetic probe that detects a magnetic field induced by electric current passing the electric wire, on the side of the second outer leg portion, when seen from the gap portion. <P>COPYRIGHT: (C)2013,JPO&INPIT |
