| 摘要 |
<p>PURPOSE:To accurately detect an imbalance of secondary leads in a simple operation by disposing the leads at the positions corresponding to the vertices of a regular triangular shape, rotating a magnet at the center of gravity, and detecting the imbalance by utilizing the displacement of the position of the magnet. CONSTITUTION:The secondary leads 1-3 of a wound-rotor type induction motor are disposed at the positions corresponding to the vertices of a regular triangular shape, and a magnet 8 is rotated at the center of gravity. In the state that the secondary side is normal, a small magnet 8 is rotated at the position corresponding to the center of gravity of a holding plate 4 by 3-phase rotary magnetic field formed by the leads 1-3. When the secondary side becomes imbalance, the magnet 8 is displaced, and when this displacement becomes the prescribed value or larger, a wire 7 is contacted with a malfunction detecting ring 9 to operate an ammeter 13.</p> |
