| 摘要 |
<p>The catch has a magnetic circuit comprising a magnet (4) closable by a magnetizable yoke (3), where magnetic effect of the magnet on the yoke is changeable. The magnet has an arrangement of permanent magnets (5) in which a magnetic field end is generated by a switching magnet (7) whose magnetization direction runs along connection of pole pieces (6) of the magnet. The switching magnet is remagnetizable for changing magnetic field emission of the magnet at the pole pieces, where the change is detected by measuring frequency change of coils (8, 9) based on magnetic saturation of the magnet. The coils are formed as windings of the switching magnet.</p> |
