SU1418876A2 - Device for controlling induction motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of various industrial mechanisms. The aim of the invention is to increase the reliability of the device. To this end, the working mechanism is stopped at any point in its path, including in the extreme positions, using the control button 3. Relays with a 17 M cutout terminal with make contacts 18-20 do not allow the mechanism to spontaneously turn on after a stop. 1 il.

Description

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The invention relates to electrical engineering, can be used in electric drives of various industrial mechanisms, and is an improvement of the device according to auth st. 1198718.

The purpose of the invention is to increase the reliability of the device.

The drawing shows a schematic diagram of a device for controlling an asynchronous motor.

The device contains control buttons 1–3, triacs 4 and 5, one power outputs of which, respectively, through serially connected pull contacts 6 and 7 and coils 8 and 9 of contactors are integrated and equipped with terminal 10 intended for

When power is supplied, both triacs and 5 are locked because the control electrodes do not flow through the open contacts of buttons 1 and 2 and contacts 12, 13 and 19, 20. Pressing buttons 1 and 21 turns on the coil 17 of the relay. The pins 18-20 close and the relay becomes self-enclosed. The circuit is closed, made up of a resistor 14, closed contacts of the path switch 15, the contact button 1, the transition control contact - the cathode of the triac 4,

5 pin 6 and the coil 8 of the magnetic starter, a current passes, which unlocks the triac A and triggers the coil 8 starter. In this case, the contact 13 of the starter with coil 8 closure

connection to the power source, .dru-20 ka, shunt button 1, and the opening of the power outputs of the triacs 4 and 5 through the first and second 2 control buttons are connected to another output 11, designed to connect to

each half cycle (at the beginning of half cycles) triac 4 shunts its control circuit, reducing the flow through pin 12 and switching 30

to the power supply, buttons 1 and 2, respectively, 25 tel 15 current to the magnitude of the pulse terminal are bridged by the closing contacts 12 and 13 of the contactors, the connection point of the other power terminals of the triacs 4 and 5, the resistor 14 is connected to the common outputs of the path switches 15 and 16, the outputs open contacts are connected via buttons 1 and 2, respectively, to control triggers of triacs 4 and 5, relay 17 with a coil, and three closing 35 contacts 18-20, quarter 21 and fifth 22 control buttons mechanically connected to the first 1 and second 2 control buttons respectively. One branch of the fourth 21 and fifth 22 40 control buttons and the first closing contact 18 of the relay are combined and connected to terminal 10, intended for connection to a power source. The other terminals of the fourth 21 and fifth of the 22 control buttons and the first closing contact 18 of the relay are connected and connected via a coil 17 of the relay to the common connection point of the other terminals of the triacs 4 and 5. Some of the second 19 and third 20 closing contacts of the relay are connected to the control The corresponding terminals of the respective SM1 stores are 4 and 5, and the other outputs are connected with the closing contacts from the corresponding track switches 16 and 15.

The device works as follows.

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current, the amplitude of which does not exceed the current unlock the triac.

An electric motor (not shown) begins to rotate in the forward direction. Due to the closure of the contact 12, the coil 8 of the actuator is kept on, and the triac 4 is unlocked and after the opening of the button 1. At the same time by its disconnecting contact 7, the coil 8 of the actuator disrupts the power supply circuit of the coil winding 9 of the actuator, excluding their simultaneous activation.

When, under the action of a working body set in motion by an electric motor, the contacts of the path switch 15 are switched, the control circuit of the triac 4 is de-energized and the coil 8 of the starter is switched off. If the power contacts and contacts 12 open, and contact 7 closes. Through the closing contact of the path switch I5 and the contact 20 of the control electrode of the triac 5 is connected through its resistor 14 to its power output, and the synistor 5 triggers, causing the coil 9 of the actuator to turn on. This starter uses its electric motor power contacts for reverse rotation. At the same time, the contacts of the coil 8 of the actuator are closed, and it is supported by ro t1o;

each half cycle (at the beginning of half cycles) triac 4 shunts its control circuit, reducing the flow through contact 12 and switching over 0

5 tel 15 current to the value of the pulse 5 0 s

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current, the amplitude of which does not exceed the current unlock the triac.

An electric motor (not shown) begins to rotate in the forward direction. Due to the closure of the contact 12, the coil 8 of the actuator is kept on, and the triac 4 is unlocked and after the opening of the button 1. At the same time by its disconnecting contact 7, the coil 8 of the actuator disrupts the power supply circuit of the coil winding 9 of the actuator, excluding their simultaneous activation.

When the contacts of the trip switch 15 are switched, the triac control circuit 4 is de-energized, and the actuator coil 8 is turned off, when driven by an electric motor driven by an electric motor. If the power contacts and contacts 12 open, and contact 7 closes. Through the closing contact of the path switch I5 and the contact 20 of the control electrode of the triac 5 is connected through its resistor 14 to its power output, and the synistor 5 triggers, causing the coil 9 of the actuator to turn on. This starter uses the power contacts of the electric motor for reverse rotation. At the same time, the contacts of the coil 8 of the actuator are closed, and it is supported by ro t1o;

after switching the contacts 15. At the same time, the contacts 6 of the coil 9 of the actuator are disconnected, isktyucha simultaneous operation of the coil 8

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When the trip switch 16 is triggered, the triac control circuit 5 is de-energized, and the triac electrode 4 is connected to terminal 11. In the future, the operation of the circuit is repeated.

The device is turned off by button 3. In this case, the simulator 4 or 5 is locked, the coils 8 or 9 of the starters are turned off, the relay with the coil 17 is turned off, the contacts 12 or 13 and the contacts 18-20 are opened and after closing the button 3 of the coils of the starters in any position the motor remains off as the relay is de-energized and pins 19 and 20 open.

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Claims (1)

Invention Formula A device for controlling an asynchronous electric motor according to the author, St. W, characterized in that, in order to increase reliability, a relay with a coil and three make contacts, a fourth and fifth control buttons are inserted into it, 10 mechanically connected with the first and second control buttons, respectively, one terminals of the third and fourth control buttons and the first closing contact of the relay are combined and connected to a single terminal intended for connection to a power source, other terminals of the fourth and fifth control buttons and the first closing contact relays combined 20 through the coil of the relay are connected to a common connection point, other power triacs of the triacs, some pins of the second and third closing relay contacts are connected to the control pins of the respective triacs, the other outputs of the second and third closing contacts of the relay are connected to the terminals of the corresponding contacts of the path switches . thirty