SU1513601A1 - Device for remote control of reversible electric motor - Google Patents

Description

The invention relates to electrical engineering and can be used in electric industrial mechanisms. The purpose of the invention is to increase the reliability of the device. This is achieved by including four diodes 16–19 and two

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thyristors 20,21 with control circuits. The presence in the supply circuits of coils 1 and 2 of the contactors "Forward" and "Back" diodes 5, 18, 19 and 6, 16, 17, respectively, protects the motor from operating in a non-phase-phase mode. Using thyristors 20 and 21, the control circuits of which are connected respectively to the closing contacts of buttons 12, 13 of the Start, Forward, and Start Back controls, allows switching from one mode of the electric motor to the motor ιοοΊy to another, the control button 11 has passed. Table". This eliminates the possibility of simultaneous inclusion of

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The invention relates to electrical engineering and can be used in electric industrial mechanisms. five

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

The drawing shows a diagram of the device to control the reversible motor. ten

The device contains two contactor “Forward” and “Back”, coils 1 and 2 of which are connected by the same terminals through the first disconnecting contacts 3 and 4 of the contactors 15 of the opposite direction to the anode of the first and to the cathode of the second diode 5 and 6 respectively, the opposite conclusions of which the other terminals of coils 1 and 2 of the 20 and forward and back contactors are connected through the second opening contacts 7 and 8 · contactors of the opposite direction, the anode of the first and the cathode of the second diode 5 and 6 are connected ^ 5 respectively to the same terminals closing contacts 9 and 10 contactors "Forward" and "Back", button 11 of the control "Stop", buttons 12 and 13 of the control "Start forward" and "Start back", respectively, the third and fourth diodes 14 and 15, four diodes 16-19 , two thyristors 20 and 21, two resistors 22 and 23, one terminals of which are connected to the first stationary contacts of buttons 12 and 13 of the "Forward Start" and "Start Reverse" controls, respectively, and the other terminals are connected to the anodes of the third and fourth diodes 14 and 15, the cathodes of which are connected respectively to the control electrodes of the first and second shooting ranges Sources 20 and 21, the anode of the first thyristor 20 is connected to the movable contact of the 12 "Start Forward" control button and one contact of the "Stop" button 1I, the other contact of which is intended to be connected to the first output of the power source, the second fixed contact of the 12-button 50 “Start forward” is connected to the cathode of the second thyristor 21, the anode of which is connected to the moving contact of the “Start back” control button 13 and to the combined terminals of the other $$ disconnecting contacts 7 and 8 of the Forward and Back contactors, the second fixed contact to opki control 13 "Start reverse" connected to the cathode of the first thyristor 20, anode terminals of the second, fifth and sixth diodes 6,

16 and 17, respectively. Designed to connect to the first, second and third phases of the power source, the cathode leads of the fifth and sixth diodes 16 and 17 are combined and connected to another pin of the closing contact 10 of the Back contactor, the cathode leads of the first, seventh and eighth diodes 5 , 18 and 19, respectively, are designed to be connected to the first, second and third phases of the power supply; the anode terminals of the seventh and eighth diodes 18 and 19 are combined and connected to another output of the closing contact 9 of the Forward contact.

The device works as follows.

In the initial state shown in the drawing, when the supply voltage of the 3-phase AC power supply coil 1 and 2 of the Forward and Backward contactors is de-energized, the thyristors 20 and 21 are closed. When you press the "forward start" control button 12, the thyristor 20 is turned on and after the thyristor 20 is opened, the contactor with coil 1. Simultaneously with the power contacts of this contactor, which includes the "Forward" mode of the electric motor, contact 9 closes and the contactor does not go over zero. phase rectified voltage. Since the contactor is triggered in no more than 100 ms, and therefore, during this time, contact 9 is closed, it is sufficient to briefly press the control button 12. Also, contacts 8 and 4 are opened simultaneously, which prevent the “Back” contactor from turning on when the “Forward” contactor is on.

To turn off this mode of operation, it is enough to briefly press the button 11 of the "Stop" control or simultaneously control the buttons 12 and 13. As a result, the neutral wire of the power source is broken and the device returns to its original (disconnected) state. Disconnection also occurs when at least one of the phases breaks, since the current through the thyristor 20 goes into

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in this case through zero. Thereby

zero protection and protection of the motor against operation in a non-phase-phase mode of operation,

The inclusion of the operating mode of the electric motor "Back" is carried out in a similar way, i.e. when the control button 13 is pressed, the thyristor 21 is turned on, and after the thyristor 21 is opened, the back contactor is turned on. Simultaneously with the power contacts of the “Back” contactor, including the “Back” mode of the electric motor, contact 10 is closed and the contactor is supplied with non-zero-crossing 3-phase rectified voltage. Just as to activate the previous mode (“Forward”), to activate this mode (“Back”), it is enough to briefly press the “Start back” control button 13. Also, contacts 7 and 3 are simultaneously opened, preventing the "Forward" contactor from turning on when the "Back" contactor is on.

The shutdown of this mode of operation of the electric motor is carried out in the same way as the previous one; it is enough to briefly press the button 11 "Stop" or simultaneous control buttons 12 and 13. Similarly, zero protection and protection of an electric motor against operation in a non-phase mode are carried out.

The transition from one mode of operation of the motor to another, for example from the mode "Forward" to the mode "Back" and vice versa, can be accomplished by bypassing the button 11 of the control "Stop". To do this, simply press the corresponding control button.

Thus, this device allows you to enable the modes of the motor "Forward" and "Back" on two wires ^ in any sequence, eliminates the possibility of simultaneously turning on both con-. Tactors. The device allows you to disable any of the modes of operation using the "Stop" control button and simultaneously pressing the "Start Forward" and "Start Back" control buttons, which increases the reliability of the shutdown, for example, when the Stop /

Claims (1)

Claim A device for remote pressure relief by a reversible electric motor, containing two contactors “Forward” and “Back”, the coils of which are connected by one terminals respectively to the anode terminal of the first diode and to the cathode terminal of the second diode, opposite terminals of the yen union , other conclusions of coils of contactors "Forward" and "Back" through vto-. The second disconnecting contacts of the opposite direction are combined, the first and second cathode diodes are connected respectively to the same terminals of the closing contacts of the Forward and Back contactors, the control button "Stop", the buttons Controls "Start Forward" and "Start 70 'I! back. with two fixed and movable contacts each, the third and fourth diodes, which is the case, in order to increase reliability, four diodes, two thyristors and two resistors are inserted in it, one of which terminals are connected to the first fixed contacts of the corresponding control buttons "Start 30 forward and reverse start, and the other terminals of the resistors are connected respectively to the anodes of the third and fourth diodes, the cathodes of which are connected respectively to the control electrodes of the first and second thyristors, the anode of the first thyristor is connected to the moving contact of the control button Start Forward and one output of the "Stop" control button, the other output of which is provided with a clip for connecting to the zero wire of the power source, the second fixed contact of the "Start-up" control button is connected to the cathode of the second 45 thyristor, the anode of which is connected to the movable output of the control button "Start back" and with the combined high I Dami second disconnecting contacts of the contactors "Forward" and "Back", the first 50 'fixed stationary contact of the control button "Start back" is connected to the cathode of the first thyristor, the anode terminals of the second, fifth and sixth diodes are connected to the first, second and third phases power supply, respectively, the cathode outputs of the fifth and sixth diodes merged and connected to another make contact contact 7 1513601 eight Pa "back", the cathode leads of the first, seventh and eighth diodes are designed to be connected to the first, second and third phases of the power supply, respectively; the anode leads of the seventh and eighth diodes are combined and connected to another lead of the forward contact of the contactor