SU782009A2 - Change-over switch - Google Patents

Description

(54) SWITCH

; one,

The invention relates to electrical engineering and is used predominantly in metal processing in the mill-. kah automatics.

According to the main auth. 639041 is a switch containing a reed switch, with an excitation winding located on the cylinder of each of them, a movable permanent magnet, a load, a power source, variable resistors and diodes, each winding of a daisy-wire is connected through one of the diodes to the contacts of the reed switch covered by it and through a common variable resistor and separately through two other diodes to the contacts rTpiej qVTWr r Ii, of the subsequent reed switches, the magnetic flux of each excitation winding being directed oppositely to the flux of a constant magnet l.

A disadvantage of the known switch is unreliable operation when used in electronic devices due to vibration of the reed contacts when triggered, leading to false triggers in high-speed circuits.

The purpose of the invention is to reduce the vibrations of the contact cores of the ticker when triggered.

To achieve this goal, a switch containing a reed switch, an excitation winding located on the cylinder of each of them, a moving permanent magnet, a load, a power source, variable resistors and diodes, each excitation winding is connected through one of the diodes to the contacts of the reed switch covered by it and

10 through a common variable resistor and separately through two other diodes - to the contacts of the previous and subsequent ones

reed switches, and the magnetic flux of each winding of the recovery is directed

tS is counter to the flow of a permanent magnet,

Introduction of additional field windings according to the number of reed switches, kaasda. of which are connected to the power supply through KOHTaiftbi gerkoy, 6x20 vaccinated with this excitation winding, and the magnetic flux of the additional excitation windings in the direction jjeH is consistent with the post magnet.

75 The schematic diagram shows the switch.

The switch consists of a control constant 1, which is opened when moved to reed switches 2.

30 On the cylinder of each reed switch placed

excitation winding 3 and additional excitation winding. The excitation winding 3 is connected through variable resistors 4 and diodes 5 parallel to the load b covered by the herkle and parallel to the loads of the neighboring reed switches. The additional excitation winding 7 is connected in parallel with the load b of the reed switch covered by it.

The excitation windings on the cylinder of each reed switch are made so that the rise time of the magnetic flux of the additional excitation winding does not exceed half the period of free oscillations of the reed switch contacts, and the rise time of the magnetic flux of the excitation winding 3 is 5-10 periods, and the magnetized clear force of the additional excitation winding em 20-50% of the magnetizing force of the winding 3 excitation.

In the controlled state, the controllable magnet 1 is opposite one of the reed switches 2, the contacts of the latter are closed. The supply voltage is applied to the winding 3 and the additional winding 7 of the actuating of the reed switch, and so the winding 3 of the excitation of the adjacent reed switches, Magnetic Fluxes of the windings 3 of the excitation of the reed switches adjacent to the activated, and the total magnetic flux from the winding 3 and the additional 7 of the activated reed switch 2 The gaps between the contact cores are directed oppositely to the flow of the permanent magnet 1 and ensure the reliability of the separate actuation of the reed switches in the switch.

When a permanent magnet is moved, the magnetic flux created by it in the actuated reed switch decreases. The contacts of the reed switch open, the field windings de-energize.

Moving the permanent magnet triggers the next reed switch. The reed switch triggers and supplies power to the coil of the excitation co. the wind-reed switches with him and windings 3 and 7, located on his cylinder. since the winding 3 and the additional excitation winding 7 are connected in opposite, with the magnetic flux of the additional excitation winding being directed according to the magnetic flux

of the permanent magnet and is growing much faster than the magnetic flux of the excitation winding 3, then at the first moment of time after the contact of the reed switch is closed the sum of magnetic fluxes

from winding 3 and additional field winding is positive, i.e. coincides in direction with the magnetic flux of the permanent magnet.

As a result of a sharp increase in

The electromagnetic force of attraction of the contact cores of the reed switch at the first moment of time after the closure reduces the possibility of the occurrence of vibration of the contacts when the triggering is triggered.

Claims (1)

1. USSR author's certificate No. 639041, cl. H 01 H 36/00, 1977.