SU1576909A1 - Electromagnetic device with forcing - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for controlling electrofusion electrodes and electromagnets of a permanent unit with backlash-free closure of the core in the actuated position. The aim of the invention is to improve the speed of the device when it is disconnected without reducing the on-force forcing factor. When the switch 2 is turned on, the voltage of the power source 1 through the forcing capacitor 5 and the diode 6 is applied to the coil 3, while the transistor 7 is closed. Due to the introduction of capacitor 8, when disconnected, coil 3 is applied with a rapidly closed voltage of alternating polarity. 2 Il.

Description

SD

1

Ј ABOUT

The invention relates to electrical engineering, in particular, to devices for controlling electrofusion couplings and direct current electromagnets with backlash-free closure of the core in the actuated position.

The purpose of the invention is to increase the speed of the device when it is turned off without reducing the switch-on force.

Figure 1 shows the circuit diagram of the device; Fig. 2 is a graph of voltage across a coil of an electromagnetic device versus time.

Electromagnetic device with force contains power supply 1, switch 2 connecting coils 3 through resistor 4 and parallel to it connected chain from Ausor capacitor 5 and diode 6 to terminals of power source 1, transistor 7, the emitter of which is connected to anode of diode 6 and capacitor plate output 5, and the base is connected to the common connection point of the switch 2 and the cathode of diode 6, as well as a capacitor 8 connected between the collector of transistor 7 and the connection point of the coil terminal and the terminal of the power supply 1.

The device works as follows.

When the switch 2 is turned on, the coil is initially applied to the power supply source 1 through a boosting capacitor 5 and diode 6. The electromagnetic device changes to the active position, the boosting capacitor 5 is charged, and then a low voltage limited by resistor 4 is applied to the coil 3.

When the switch is closed, the transistor 7 is in the closed state, since a negative potential is applied to its base. When the switch 2 is open and the forcing capacitor 5 is charged, a positive potential is applied to the base of the transistor 7. The transistor 7 immediately goes to the open state and through its transition the collector-emitter from the capacitor 5 to the coil 3 is supplied with a voltage of a different polarity compared to the turn-on voltage. The application time of this voltage is limited by the charging time of the capacitor 8, the capacity of which is at least an order of magnitude smaller than the forcing capacitor 5. The latter is simultaneously discharged to the resistor 4 through the base-emitter junction of the transistor 7. In turn, the capacitor 8 again

discharged to the coil 3 and the capacitor 5 through the diode 6 and the base-collector junction of the transistor 7. Thus, the variable voltage of the polarity of the coil 3 is applied to the coil 3 (Figure 2, zone T, the short-term application of a fast-damping alternating voltage demagnetizes the magnetic system of the device, which ensures its accelerated return to the disconnected position. In the proposed electromagnetic device, there is no need to take

5 against sticking of the core, which expands the functionality of the device.

Claims (1)

Invention Formula A force-type electromagnetic device containing a coil, a transistor, a diode, a resistor, a capacitor, a switch and leads for connecting a power source, the lead for connecting the negative pole of the power source through a switch contact is connected to the base of the transistor, the cathode of the diode and one of the leads of the resistor, another which is connected to one of the terminals of the coil and through a capacitor to the emitter of the transistor and the anode of the diode, the other output of the coil is connected to the output to connect the positive pole of the source In order to improve the speed of the device when it is turned off without reducing the switch-on forcing factor, a second capacitor is inserted in it connected between the collector of the transistor and the other coil terminal, and the capacity of the second capacitor is at least an order less than the capacity of the first capacitor . Ui Editor N. Tupitsa Compiled by A. Karetnikov Tehred L. Serdyukova Proofreader S. Cherni Order 1847 Circulation 458 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 On Off T1 P FIG. 2 t tz t Subscription