SU1649514A1 - Method of control over electromagnet - Google Patents

Abstract

The invention relates to automation, and in particular to methods for automatically controlling the operation of DC electromagnets that do not have their own contact groups. The method solves the problem of controlling an electromagnet by swinging the moving system of an electromagnet before applying a control signal to its winding. To control the operation of the electromagnet, a series of pulses of shaking of the moving system of the electromagnet is formed and fed to the winding of the electromagnet, the duration of which is chosen from the condition that the moving system of the electromagnet starts to move, and the duration of the pause between the pulses from the condition of the return of the moving system of the electromagnet to its initial position. At the end of the last pulse of the series, at a time interval equal to the time of returning the moving system of the electromagnet to its initial position after being subjected to shaking pulses, a control signal is sent to the electromagnet winding and its triggering is controlled by converting the current envelope flowing through the electromagnet winding into a control pulse. When a control pulse appears, the pulses are applied to the electromagnet winding, and if they are absent, the formation and delivery of a series of shaking pulses and a control signal are repeated after the action of the control signal after the control signal’s time interval. 1 il. (Ls

Description

This invention relates to the automatic control of the operation of DC electromagnets that do not have their own contact groups.

The purpose of the invention is to increase the operational reliability of an electromagnet.

The essence of the electromagnet control method is as follows.

The drawing shows the time diagram of the electromagnet.

On the winding of the electromagnet, m commands (pulses) are sent to shake the movable system of the electromagnet (see Fig. 1), which

B

about with

The latter, by their influence, swing the moving system of the electromagnet. The latter breaks away and returns to its initial position during the pause between the shaking pulses. At the end of the shaking pulses, the first additional pulse (time ti) is formed, no the front edge of which stops the formation and supply to the electromagnet winding of the shaking pulses and after time t (figure 1, c) equal to the return time of the moving system of the electromagnet after

the impact of shaking pulses, the control signal is generated and fed to the electromagnet winding (time t2, fig. 1, d).

In this case, the current in the winding of the electromagnet increases according to a certain law, and the voltage drop proportional to the current (Fig. 1e) repeats the nature of the current change, which allows converting it into a control pulse fixing the operation moment electromagnet and formed only with the full operation of the movable system of the electromagnet. The state of the electromagnet is judged by fixing the fact of the presence or absence of the above-mentioned control pulse. If the moving system of the electromagnet fails, the absence of a control pulse is fixed (the time interval between points (Fig. 1, h), the electromagnet is not activated, and a second additional pulse is formed by the end of the control signal (Fig. 1, e), over the leading edge of which, at a time interval t equal to the return of the movable system of the electromagnet to its initial position after the influence of the control signal, the formation and supply of pulses of shaking the movable system and the signal yn are repeated The direction of the electromagnet winding is similar to that described above n times (time point G4, Fig. 1, a).

When a moving electromagnet system is triggered, a control pulse is detected (time interval between ts-te points, Fig. 1.h), the electromagnet is triggered and a command is given to stop the flow of pulses to the electromagnet on the falling edge of the control pulse figure 1, and).

Claims (1)

Claim Method An electromagnet control method based on applying a control signal to an electromagnet winding and controlling it actuation by converting the envelope of the current flowing through the electromagnet winding into a pilot pulse that detects the actuation of the electromagnet, characterized in that. what with the purpose increase operational reliability, form a series of pulses shaking the movable system of the electromagnet, the duration of which is chosen from the condition of ensuring the beginning of the movement of the movable electromagnet system, and the duration of the pause between pulses from the condition of ensuring the return of the movable system of the electromagnet to its original position, and the control signal is formed and served the end of the last pulse of the series after a time interval equal to the time of returning the movable system of the electromagnet to its original position after acting on the winding of the electromagnet of the shaking pulses, when a control pulse appears, the pulses are applied to the winding of the electromagnet, and if it is not present, after a time interval equal to the time of returning the moving systems The electromagnet is reset to its initial position after being subjected to a control signal, repeating the formation and delivery of a series of shaking pulses and a control signal.