| 摘要 |
<p>PURPOSE:To obtain the current detector which has a small hysteresis voltage corresponding to the optional purpose of use and detection current range by inserting another ferromagnetic material into the gap part of a ferromagnetic material core. CONSTITUTION:The current detector is constituted by forming a toroidal core 3 of directional silicon steel so as to widen the detection current range, forming the gap where a magnetism sensing element is inserted in the silicon steel core 3, and laminating and inserting a 'Permalloy(R)' thin plate which has the same sectional area with the silicon steel core into the expanded gap. In this case, the residual magnetism of the whole core is reduced and the hysteresis voltage falls. The 'Permalloy(R)' 4 suppress a decrease in the sensitivity of the current detector. Then magnetic flux density is smaller nearby the gap 1 of the ferromagnetic material core than in the entire core and the detection current range which is closer and closer to the directional silicon steel is obtained as the 'Permalloy(R)' of the gap part is thinner and thinner.</p> |
