| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent magnetic flux from flowing, from the side of a magnetic shield case toward a low magnetic resistance part of a magnetic core, using a simple constitution in a current sensor of the zero-flux method. <P>SOLUTION: The current sensor includes both the ring-like magnetic core 10, in which a wire to be measured is inserted in an internal space and the magnetic shield case 20 surrounding the periphery of the magnetic core 10. A magnetoelectric transducer 31 is arranged in the magnetic core 10, and a negative-feedback coil 32, to be provided with a negative-feedback current from the magnetoelectric transducer 31 via an amplifier, is wound on a part of the magnetic core 10. In the magnetic shield case 20, specific parts, corresponding to parts at which the magnetoelectric transducer 31 and the negative-feedback coil 32 are not arranged on the side of the magnetic core 10, are formed greater in volume than those of the other parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
