| 摘要 |
<p>An instrument for measuring the magnitude of an electrical current. A coil, through which the current to be measured flows, is positioned between two spaced plates constructed of a magnetic material, with each plate having a generally spirally-shaped opening therein. U-shaped magnetic members are positioned to complete a magnetic circuit through the plates. A movable magnetic member extends substantially vertically between the openings of the plates, providing a magnetic path between the plates for magnetic flux flowing through the center of the coil. The movable member is mounted for restrained rotation within the openings of the plates, with the angular movement being responsive to the magnitude of the current flowing in the coil. The rotation of the movable member with increasing current reduces the distance between the movable member and the adjacent surfaces of the plates which define their generally spirally-shaped openings.</p> |
