| 摘要 |
PURPOSE:To elevate the accuracy for measuring rotating energy of a fly-wheel, by placing a pair of magnets on a path of an electric conductor formed as one body with the fly-wheel, and providing a magnetism detecting element on a position where an applied magnetic field in the vertical direction of the electric conductor becomes zero. CONSTITUTION:A pair of magnets 4 are placed on a path of an electric conductor 3 which has been concentrically provided on the 1 side of a fly-wheel 2, and a magnetism detecting element 5 is placed at a position where a component of an applied magnetic field in the vertical direction of an applied magnetic field by said each magnet 4 and a magnetic field by an eddy current generated by movement of the electric conductor 3 becomes zero. As a result, the detecting element 5 detects only strength of a magnetic field corresponding to a peripheral speed of the electric conductor 3, by which a variation of rotating energy of the fly-wheel can be monitored by both an operating circuit and a controlling circuit. Also, since the electric conductor 3 does not contact with the magnet 4 and the detecting element 5, a drop of the measuring accuracy due to abrasion does not occur, therefore, the maintenance and inspection are not required extending over a long period of time. |
