Magnet system for an electromagnetic relay

摘要

In the case of this magnet system for an electromagnetic relay, a main armature (A2) and an auxiliary armature (A1) each have permanent magnets (M2, M1) allocated to them, the flux of the permanent magnet (M2) acting on the main armature (A2) not being sufficient to attract this armature against a restoring spring (F), and the effect of the magnetic flux of an energising coil (S) being connected in parallel with the said permanent flux. When such a magnet system is energized by means of a medium frequency alternating current, preferably 400 Hz, in order that the contacts which can be operated by the main armature (A2) are given a monostable switching behaviour, while additional switching processes can be carried out by the auxiliary armature, it is provided that both armatures are arranged at the ends of a laminated iron circuit, that the auxiliary armature (A1) has two pole plates on both sides of a permanent magnet (M1) which engage around the ends of the iron circuit with which ends said auxiliary armature (A1) interacts, that the two poles of the permanent magnet (M2) allocated to the main armature (A2) and the energizing coil (S) are arranged between opposite sections of the iron circuit, and that the core (K) of the coil (S) essentially short-circuits the permanent magnet (M2) in the unenergized state of the coil (S) and, in the energized state, is saturated in such a manner that the flux of the permanent magnet (M2) is essentially closed via the pole surfaces of the main armature (A2) and a required residual airgap. <IMAGE>