| 摘要 |
This electromagnetic actuator for moving a contact (2) into a switched-on or switched-off state comprises: a contact-actuating rod (1) which is displaceable in the longitudinal direction between a first position, corresponding to the switched-off state, and a second position, corresponding to the switched-on state; a core (4) which is made of magnetisable material is attached to the contact-actuating rod (1), and interacts with a switch-on coil (5); a pole piece (6) which is made of magnetisable material and of which that face which is directed towards the core (4), in the first position of the contact-actuating rod (1), is arranged at an air-gap distance (d1) from that surface of the core which runs perpendicular to the direction of displacement, and in the second position bears as closely as possible against the core surface; a yoke (10) made of magnetisable material for closing the magnetic flux circuit of the switch-on coil through the pole piece (6) and the core (4); a permanent magnet device (8) to maintain the contact-actuating rod (1) in the second position; a spring (3) which preloads the contact-actuating rod, in its second position, towards the first position; and a switch-off coil (14) which, for the purpose of moving the contact-actuating rod (1) from the second position to the first position, is excited in order to eliminate the magnetic field of the permanent magnet device at least temporarily. The magnetic flux circuit of the permanent magnet device (8) is separate from that of the switch-on coil (5).
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