SU1229828A1 - Device for forced switcing-on of electromagnet from d.c.source - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for the forced activation of electromagnets (EM). The purpose of the invention is to increase reliability and reduce energy loss. In the initial state, contacts (K) 2 and 5 are open. In this case, capacitors 4 are charged from the source and through diodes 3 and resistors. When EM 1 is turned on, K 2 and 5 are closed, forming a power supply circuit through the source and and series-connected capacitors 4. The voltage (n + 1) U is applied to EM 1, where n is the number of capacitors. As capacitors are discharged 4, this is for example -. the woman is reduced to U. It is also described ycrpcrftcTBO, in which K 5 - switching, but not closing. 3 i. (L CO 00 th cx J / jfLL FIG.

Description

The invention relates to electrical engineering, and more specifically to devices for the forced activation of electromagnets.

The aim of the invention is to increase reliability and reduce energy loss.

FIG. Figures 1 and 2 illustrate the circuit diagram of the device when using the switching and switching auxiliary contacts, respectively} in FIG. 3 is a diagram of the voltage pulse applied to the winding.

The device (Fig. 1) is intended for the forced connection of the electromagnet 1 from the source U. The power contact 2 and the diodes 3 are connected to the circuit between the source and the electromagnet and the number of the latter corresponds to the force multiplicity. Each diode 3 is shunted by a capacitor 4, in series with which an auxiliary switch contact 5 of the power contactor is connected. The common point of each capacitor 4 and pin 5 is connected to the source negative by means of a resistor 6.

Figure 2 shows a variant of the device using auxiliary switching contactors.

The device (figure 1) works as follows.

Suppose contacts 2 and 5 are open in the initial state, while capacitors 4 are charged from the source and through diodes 3 and resistors 6 with polarity, as shown in Fig. 1. When electromagnet 1 is turned on, they close contacts 2 and 5, forming a power circuit, which includes the source and and the series-connected capacitors 4. Voltage (n + 1) U is applied to electromagnet 1, where n is the number of capacitors 4. As the capacitors discharge. 4, this voltage decreases to U, as shown in FIG. 3.

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The device of FIG. 2 pa. Similarly, but using the switching contacts 5 in the on state of the power contact 2 disconnect the resistors 6, thereby eliminating the parasitic leakage of the current i Un / R, where R is the resistance of the resistor 6.

Claims (1)

Invention Formula A device for forcedly switching on an electromagnet from a DC source, containing a contactor with main and auxiliary contacts, a group of identical cells, each of which consists of a capacitor, a resistor and an auxiliary contact of the contactor, pins for connecting a DC source, and pins for connecting the coil of the electromagnet, one of the leads for connecting the source of an alternating current is connected to one of the leads for connecting the electromagnet winding, the other for connecting to All the cells are connected in series, in each cell one of the terminals of the resistor and one of the capacitor plates are connected to the auxiliary contact, one of the terminals of the auxiliary contact is connected to one of the terminals for connecting the DC source, and the other terminal a resistor with a different output for connecting a DC source, characterized in that, in order to increase the reliability and reduce the energy loss, one cell was inserted into each cell, iody connected in series, series circuit consisting of diodes connected between the one terminal for connecting the power source and the other terminal of the main contact of the contactor, in each cell the diode shunted capacitor connected in series and the auxiliary contact. 0- -l-i / {NN tg-TIN kniJ witj gn n 0g FIG. g 5U iFig .Z