SU115119A1 - Polarised Relay with Magnetic Self-Retention - Google Patents

Description

In railway alarm systems, polarized relays with magnetic self-retention, consisting of a permanent magnet, a clip-like core with a winding mounted on it and a movable core, are widely used in railway alarm systems.

However, the known relays are not reliable in operation, since they can be returned to the inoperative position by pulling the bar out of the hand or when vibrating, working, or getting dust in the magnetic gap.

The proposed relay is more stern than the known ones, since it increases the reliability of self-holding. This is achieved by the fact that the bark of the relay is made of a magnetically hard material with significant residual induction.

This action ensures a reliable attraction of the core to the permanent magnet during the operation of the relay, a reliable holding of the core after the de-energizing of the winding and its return to the inoperative position after giving a current of reverse polarity to the winding of the relay.

The drawing shows a schematic diagram of the magnetic system of the proposed relay in the inoperative and operational positions.

The torus contains a permanent magnet 1, a brace shaped core 2 with a winding 3 and a measles 4. The permanent magnet is fixed either on the core or on the relay core. Anchor 4 is made of a magnetically hard material with significant residual induction.

In the off position (a), the bark of the relay is pulled by a permanent magnet 1 and forms a loop with the latter and the core 2.

When the current is passed through the winding 5, the relay is triggered, and the measles forms a closed magnetic circuit only with core 2 (b).

When de-energizing winding 3 measles, due to residual

magnetism, retains the same position as when current passed through the winding.

Manual reset of the relay to the off position is not possible, since the magnet pole / and the core 2 have the same polarity. Therefore, in order for the relay to return to idle state, it is necessary to re-magnetize its core, which is accomplished by passing a reverse polarity current through the winding 3.

Subject invention

A polarized magnetic self-holding relay intended for use, for example, in railway signaling circuits and consisting of a permanent magnet, a clamped core with a winding mounted on it and a movable core, in order to increase the self-holding reliability, measles is made of a magnetically hard material with significant residual induction, which ensures a reliable attraction of the core to the permanent magnet during the operation of the relay, a reliable holding of the core after de-energizing bmotki and returns after a reverse polarity current to the relay coil.