SU1436269A1 - Device for controlling electromagnetic clutch - Google Patents

Abstract

The invention relates to electrical engineering and can be used / in controlling metal cutting machines and: presses:. The aim of the invention is to simplify the device. The device contains a thyristor 10, kao. The fLA-As A. whose current is connected to the cathode of the thyristor 7. The control electrode of the thyristor 10 is connected to the output of the com- pactapparatus 2, the transformer 1 has a secondary two-section winding. Extreme terminal 11 is connected to the anode of the thyristor 7, and extreme terminal 12 to the anode of the T1 sensor 10. The common terminal 13 of the sections is the common wire of the device. When the control unit 2 is turned on, the thyristors 7 and 10 are opened. On the winding 8 half-periods of forced and nominal voltages appear. The time of action of the forced voltage is determined by the time constant of the charge circuit of capacitor 6. I Il. A. / (L

Description

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The invention can be used in control of metal cutting strips and presses.

The purpose of the invention is to simplify the device.

The drawing shows a schematic diagram of the device.

The device contains a transformer 1, a commander 2, the output of which is connected through a first resistor 4 and a second resistor 5, shunted by a capacitor 6, connected to the thyristor 7 electrode, the cathode of which is connected to the output winding of an electromotive coupling 8, and a control source 9 and the second thyristor 10, the cathode is connected to the cathode of the thyristor 7, and the control electrode is connected to the output of the controller 2, the input of the control voltage source 9 connected to the switch.

Transformer 1 has a secondary two-section winding, while the extreme terminal 11 of the section with a larger number of turns is connected to the anode of the thyristor 7, and the extreme terminal 12 of the section with a smaller number of turns to the anode of the second thyristor 10, and the common terminal of 13 sections is common wire a device to which the second outputs of the winding 8 of the electromagnetic coupling and the source 9 of the control voltage are connected. The diagram also shows the discharge diode J4 and the limiting resistor 15.

The device works as follows.

When the commander 2 is turned on, the thyristor 7 is disconnected by the charging current of the capacitor 6 through diode 4 and the first resistor 3, and the thyristor 10 by the current through the limiting resistor 15. On the winding 3, a series of positive half-periods of the positive and nominal voltages appear.

The time of action of the forced on the yarn is determined by the constant time of the charge circuit of the capacitor 6. According to

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As the capacitor is charged, the current through it decreases to the boundary current unlocked by the thyristor 7, after which the forcing mode ends.

From the moment of the end of the forced mode until the opening of the control unit 2, a positive single-half-voltage is applied to the winding 8, the effective value of which is equal to the nominal operating voltage of the winding 8.

Upon opening of the controller 2, the capacitor 6 is discharged through the second resistor 5, and the diode 4 eliminates the shunt discharge circuit of the capacitor.

The time constants of the charge and discharge circuits of the capacitor 6 are selected from the conditions of the maximum frequency of the forced switching on.

Claims (1)

Invention Formula A device for controlling an electromagnetic clutch, containing a power supply unit, a control unit, the output of which is connected through a series-connected first resistor, a diode and a second resistor, which is bridged by a capacitor, is connected to the control electrode of the thyristor, the cathode of which is connected to the output winding of the electromagnetic clutch, characterized in that for the sake of simplicity, a control voltage source and a second thyristor, the cathode of which is connected to the cathode of the thyristor, and the control electrode are connected to the output of the controller, input connected to the outlet of the control voltage source, the power supply unit is made in the rear of the transformer with a two-section secondary winding, while the end of the section with a larger number of turns is connected to the thyristor anode, and the extreme end of the section with a smaller number of turns is connected to the anode of the second thyristor, and the common The output of the sections is a common wire to which the second outputs of the coil of the electromagnetic clutch and the source of control voltage are connected.