SU1709402A1 - Device for control over electromagnet - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control electromagnetic devices (relays, contactors, contactless electromagnets, etc.). applied in automatic control systems. The purpose of the invention is to increase the efficiency and reliability of control by generating a pulse of operation of the moving system of the electromagnet and re-supplying the automatic control signal in the event of a failure of the electromagnet. The device contains an adjustable power source, a mode setter, a current meter, a differentiation unit, leads for connecting the electromagnet winding, a delay element, a bus for setting the device to its initial state, three OR elements. element I, two triggers, key, standby multivibrator, two one-vibrator, element BAN, load element. storage element, electromagnet operation pulse shaper, rectifier and switching element. When the switching element is closed, the voltage from the source output goes to the circuit. A current flows through the electromagnet winding. If the electromagnet does not operate, then the circuit automatically generates a second signal to trigger. After the electromagnet is turned on, it is powered in an economical mode. 2 or 00G

Description

The invention relates to electrical engineering and can be used to control electromagnetic devices (contactors, contactless electromagnets, etc.). applied in automatic control systems.

A device for controlling an electromagnet is known, comprising leads for connecting an electromagnet winding, an electronic switch, a constant voltage source, a feedback element, a cyclic mode driver, a scaling unit, an electronic switch, a field current setpoint device, an OR element, and a delay element. .

The known device has the disadvantage that it does not control the operation of the moving system of the electromagnet from the control signal applied to the winding of the electric (electromagnet. This disadvantage of the known device reduces the effectiveness of the electromagnet control.

The closest in technical essence to the present invention is a device for controlling a driving electromagnet containing an adjustable power source, mode setter, current meter, and the output of the mode setter is connected to the control input of the regulated power source in the output circuit

which includes a current meter and leads for connecting the winding of the drive mechanism, as well as a differentiating unit, a polarity determining unit, two AND elements, an OR element, an RS flip-flop, a delay element, and an output for the initial installation signal connections. The output of the current meter is connected to the input of the differentiating unit, the output of which is connected to the input of the polarity determining unit, the first output of which is connected to the first input of the first element AND, the second input of which is connected to the output of the delay element, and the output to the first input of the OR element, the second input which is connected to an output for connecting a source of the initial installation signal. The second output of the polarity determination unit is connected to the first input of the second element I, the second input of which is connected to the input of the delay element and the first input of the mode setter, and the output to the S input of the RS flip-flop, the R input of which is connected to the output of the OR element, output RS flip-flop is connected to the second input of the sensor mode.

. The known device has the disadvantage that it does not control the operation of the moving system of the electromagnet from the control signal applied to the winding of the electromagnet, and also does not automatically provide a re-supply of the control signal to the winding of the electromagnet in case of its failure. This disadvantage reduces the control efficiency and the reliability of the operation of the movable system of the controlled electromagnetic apparatus.

The purpose of the invention is to increase the control efficiency and reliability of the operation of the electromagnetic motion-controlled system by generating a pulse of the action of the mobile system of the electromagnet and re-supplying the control signal to the winding of the controlled device in the automatic mode when it fails.

The goal is achieved by those. that In the known device containing an adjustable source + power supply, mode setter, current meter, delay element, differentiating unit, terminals for connecting the electromagnet winding, output for connecting the device installation signals to the initial state, first trigger, first OR element and first and the second elements And, the output of the mode dial is connected to the input of a regulated power source, the first pin for connecting the winding of the electromagnet is connected to the first pin of the current meter, the output for connecting the signal anovki device to its original state is connected to the first input of the first OR element. introduced

switching element, key, load element, storage element, pickup pulse shaper, rectifier, second and third OR elements, waiting multivibrator, first and

0 second one-shot and second trigger. In this case, the mode adjuster has one input, and the first input of the first element is inverse. C. Output adjustable power source connected to the first contact

5 switching element, the second contact of which is connected to the input of the first one-shot and to the input of the key. The output of the first one-shot is connected to the first input of the second element OR. the second input of which is connected to the output of the delay element. The output of the second element OR is connected to the input of the waiting multivibrator, the output of which is connected to the first input of the second element I. The second input

5 of the second element AND is connected to the forward output of the first trigger, the output of the second element AND is connected to the first, input of the third element OR, the second input of which is connected to the inverse output of the first trigger and to the input of the mode setter, the output of the third element OR is connected to the control input of the key. The key output is connected to the output terminal for connecting, winding the electromagnet, to the first input of the first element And to the input of the differentiating unit. The output of the differentiating unit is connected to the R input of the second trigger, the S input of the second trigger OR. The inverse output of the second trigger is connected to the second input of the first element And, the output of which is connected to the input of the second one-shot. The output of the second one-shot is connected to the input of the delay element and the second input of the first element OR. The output for connecting the device setup signal to the initial state is connected to the S input of the first trigger, the R input of which is connected to the output of the rectifier, the rectifier input is connected to the output of the response pulse shaper, the noninverting input of which is connected to the first output of the load element and to the first conclusion

5 storage element. The inverting input of the former is connected to the second terminal of the load element and to the first terminal for connecting the winding of the electromagnet. The second output of the memory element and the second output of the current meter

are intended to be connected to the zero output of the power source.

FIG. 1 shows a functional diagram of the device; in fig. 2 - diagrams on the operation of the device.

FIG. 1 shows a regulated power supply 1, a setting mode adjuster 2, a current meter 3, a delay element 4, a differentiating unit 5, pins 6 and 7 for connecting the electromagnet winding, a pin 8 for connecting the device installation signals to the initial state, the first trigger 9, the first element OR 10, first 11 and second 12 elements AND, switching element 13, key 14, load element 15, memory element 16, shaper 17 of the pickup impulse of the moving electromagnet system, rectifier 18, second 19 and t | aetii 20 elements OR waiting for multiple The selector 21, the first 22 and the second 23 one-shot and the second trigger 24. The output of the setting device 2 modes is connected to the input of the adjustable source 1 of the power supply. The first pin 6 for connecting the winding of the electromagnet is connected to the first pin of the current meter 3. The output 8 for connecting the device setup signal to the initial state is connected to the first input of the first element OR 10, and the mode setter has one input, and the first input of the first element 11 is inverse. The output of the regulated power supply source 1 is connected to the first contact of the switching element 13, the second contact of which is connected to the input of the first one-oscillator 22 and to the input of the key 14, the output of the first one-oscillator 22 is connected to the first input of the second element OR 19, the second input of which is connected to the output gement 4 delay. The output of the second element OR -19 is connected to the input of the standby multivibrator 21, the output of which is connected to the first input of the second element AND 12. The second input of the second element AND is connected to the forward output of the first trigger 9. The output of the second element AND is connected to the first input of the third element OR 20 , the second input of which is connected to the inverse output of the first trigger 9 and to the input of the sensor of 2 modes. The output of the third element OR 20 is connected to the control input of the key 14, the output of the key 14 is connected to the second terminal 7 for connecting the winding of the electromagnet, to the first input of the hepBoro element 11 And 11 and to the input of the differentiating unit 5. The output of the differentiating unit is connected to the R input of the second trigger 24, The input of which is connected to the output of the first element OR 10. The inverse output of the second trigger 24 is connected to the second input of the first element 11, the output of which is connected to the input of the second one-oscillator 23. The output of the second one-oscillator 23 connects the input element At present, 4 delays and the second input of the first element OR 10. The output 8 for connecting the signal of the device installation to the initial state is connected to the input of the first trigger 9, the R input of which

10 is connected to the output of the rectifier 18. The input of the rectifier 18 is connected to the output of the driver 17 of the electromagnet operation pulse, the non-inverting input of which is connected to the first output of the load element 15 and to the first output of the storage element 16. The inverting input of the driver 17 is connected to the second output of the load element 15 and to the first terminal 6 for connecting the electromagnet winding. The second terminal of the memory element 16 and the second terminal of the current meter 3 are intended to be connected to the zero terminal of the power supply.

5 The operation mode of the driver 17 for the operation of the electromagnet is chosen so that when the power is applied to the device circuit (Fig. 1), the output of the driver 17 sets a negative voltage (Fig. 2L), under the action of which the rectifier 18 is locked. the zero state of flip-flop 9 arrives at a logic zero level, and the mode of operation of single-shot 22 and 23

5 is selected so that at their outputs (when power is supplied) the voltage level is zero (Fig. 2d, g).

The device works as follows.

0Before starting the scheme to the first

6 and the second 7 pins for connecting the winding of the electromagnet connect the winding of the controlled apparatus, and the bus 8 to set the device to its initial state

5, a short pulse is applied (Fig. 2a), to set the device to its initial state, under whose action: the trigger 9 is set to one, the logical output is set to the direct output (Fig. 2c), and to the inverse output - a logical zero that arrives at the first input of the element OR 20, the key 14 remains in the open state: through the element OR 10, the trigger 24 is set

5 is set to one and a logical zero is set at its inverse output (Fig. 2h).

To control the electromagnet, the switching element 13 is closed and the direction from the source output goes to

the input of one-shot 22, which is triggered and generates a pulse at the output (Fig. 2d), which through the element OR 19 enters the input of the waiting multivibrator 21, at the output of which a pulse is formed (Fig. 2e), which goes to the first input of the element 12, which it works, since at the second input of the And 12 element there is a logical unit with the direct output of the trigger 9 (Fig. 2c).

The signal of the logical unit from the output of the element And 12 through the element OR 20 enters the control input of the key 14, which leads to its closure. In this case, the voltage from the output of power supply 1 through the switching element 13 and the key 14 for the duration of the pulse (the time interval between points 25 and 26, Fig. 2e) goes to the electromagnet winding, and passes through the electromagnet winding 3 to the current meter 3.

The current in the winding of the electromagnet increases according to a certain law.

If the moving system of the electromagnet does not work, then the current increase in the electromagnet winding occurs without a characteristic dip (the time point of the Mekdu points 25 and 26, Fig. 2e, a continuous line); and the voltage to the non-inverting input is fed through an integrating circuit consisting of the load element 15 and the memory element 16. As a result, the voltage shape at the non-inverting input is smoothed with respect to the shape of the operation current, and the change in the signal at the non-inverting input is delayed relative to to a change in the signal at the inverting input (point in time between points 25 and 26, fig. 2e, dashed line).

The lack of characteristic of the dip on the current of operation of the electromagnet causes the voltage at the inputs of the driver 17 to increase and the voltage on the non-inverting input does not reach the value of the voltage at the inverting input, as a result of which the negative voltage remains at the output of the generator 17 (Fig 2l) with which the rectifier is locked 18. At the output of the rectifier 18, the level of logic zero is maintained, which enters the R-input of the installation in the zero state of the trigger 9 and does not change its state, due to The pc output of flip-flop 9 maintains a logic zero level, which is fed to the input of the unit of 2 modes and does not trigger it, and the forward output of flip-flop 9 maintains the level of a logic unit, which goes to

the second input element And 12 and prepares its operation.

Simultaneously, the control voltage is fed to the first inverse input

element 11 and prohibits its triggering, and on the leading edge of this voltage, the differentiating unit 5 generates a pulse (Fig. 2g), under the action of which the trigger 24 is set to

zero state. At the inverse output of the trigger 24, a signal of the logical unit (Fig. 2h) is set, which is fed to the second input of the And element 11.

At the end of the control signal (point in time - point 26, fig. 2d), the inhibit signal is removed from the first inverse input of the element 11. That causes it to trigger, since its second input contains a logical unit with

inverse output of the trigger 24, which through the element And 11 enters the input of the one-shot 22. which is triggered and forms at the output a pulse (Fig. 2i), under the action of which through the element

OR 10 trigger 24 is set to one. As a consequence, a logical zero is set at its inverse output (Fig. 2g. Point in time point 26), and a delay element 4 is passed,

the time of which is chosen from the condition of providing restoration of the circuit for the subsequent operation of the electromagnet, the indicated pulse (Fig. 2k) through the OR element 19 enters the input of the standby multivibrator 21, at the output of which a pulse is formed (Fig. 2e), which is fed to the first input of the Element I 12 and. similarly to the above, a control signal is again formed on the winding

electromagnet.

If the moving system of the electromagnet is triggered, then the current increase in the winding of the electromagnet occurs with a characteristic dip (Fig. 2e, the time between points 27 and 28. a continuous line), due to the movement of the moving system of the electromagnet. The voltage of the current meter 3 is supplied to the inputs of the former 17. At the moment when the voltage on the non-inverting input (Fig. 2e, dashed line) reaches the voltage on the inverting input (Fig. 2e. Solid line), the driver 17 abruptly switches to the positive region

saturation (Fig. 2L), thereby forming the leading edge of the pulse at the output of the imager 17. And in accordance with the nature of the current change in the winding of the electromagnet, when the voltage on the inverting input of the imager 17 reaches the voltage on the non-inverting input (Fig. 2e) The shaper 17 abruptly goes into the region of negative saturation, thereby forming the leading edge of the pulse (Fig. 2L) at the output of the shaper 17, which characterizes the triggering of the moving system of the electromagnet. The impulse from the output of the driver 17 through the rectifier 18 is fed to the input of the installation in the zero state of trigger 9 and on the falling front of this pulse the trigger 9 is set to the zero state, as a result of which the forward output of the trigger 9 is set to a logical zero (Fig. 2c), under the action of which the element 12 is closed, and at the inverse output a logical unit is established, which through the element OR 20 enters the control input of the key 14, which remains in the closed state. This signal is also fed to the input of the mode dial 2, which changes the mode of operation of the power source 1, putting it into an economical mode of holding the electromagnet in the actuated state (Fig. 2e).

At the end of the electromagnet control, the switching element 13 is disconnected (Fig. 26). The restoring of the circuit to the initial state is carried out similarly to the above, with the exception of trigger 9, for setting which the initial state needs to be given a pulse (Fig 2a) to the initial device state bus 8.

The use of the invention provides an increase in the control efficiency and reliability of the operation of the movable system of the controlled electromagnet. This is expressed in that the proposed device, in comparison with the known, provides not only a control signal, a signal to the electromagnet winding and keeping it in the actuated state in an economical mode of operation of the regulated power source, but also provides control of the operation of the electromagnet with its action activated by the mobile system.

In addition, the proposed device automatically generates the re-influence of the control signal on the winding of the electromagnet when its mobile system fails, thereby eliminating failures in the mobile system of the controlled device and this, as a result, improves the reliability of automation devices, where a controlled electromagnet is used.

Claims (1)

Claims An electromagnet control device comprising an adjustable power source, a mode setter, a current meter 5, a delay element, a differentiating unit, leads for connecting an electromagnet winding, a pin for connecting the device installation signals to the initial state, the first trigger, the first OR element and the first and the second elements And, the output of the mode dial is connected to the input of a regulated power source, the first pin for connecting the winding of the electromagnet is connected to the first pin of the Meter Single, the output device for connection setup signal in the initial state is connected to the first input of the first OR element, characterized in that, in order to increase efficiency 0 control and validity of the operation of the movable system of the electromagnet due to the formation of a pulse of operation of the movable system of the electromagnet and re-supply in the automatic mode 5 controls to the winding of the controlled device when it fails, a switching element, a key, a load element, a storage element, a response pulse shaper are inserted into it, 0 straightener, second and third elements OR, multivibrator waiting; the first and second one-shot and second trigger, and the mode dial has one input, and the first input of the first element I is inverse, 5 the output of the regulated power supply is connected to the first contact of the switching element, the second contact of which is connected to the input of the first one-oscillator and to the key input, the output of the first one-oscillator is connected to the first input of the second OR element, the second input of which is OR connected to the input of a standby multivibrator, the output of which 5 is connected to the first input of the second element AND, the second input of the second element AND is connected to the forward output of the first trigger, the output of the second element AND is connected to the first input of the third element OR, the second Whose input 0 is connected to the inverse output of the first trigger and to the mode setting input, the output of the third element OR is connected to the control input of the key, the output of the key is connected to the second output 5 for connecting the electromagnet winding to the first input of the first element I and to the input of the differentiating unit, the output of the differentiating unit is connected to the R input of the second trigger, the S input of the second trigger is connected to the output of the first element OR, the inverse output of the second trigger is connected to the second input of the first element And, the output of which is connected to the input of the second single vibrator, the output of the second single vibrator is connected to the input of the delay element and the second input of the first OR element, the output for connecting the device installation signal in The battery state is connected to the S-input of the first flip-flop, R-input of which is connected to the output of the rectifier, the rectifier input connected to the output of the pulse shaper operation, the non-inverting input of which is connected to the first output of the load element and to the first output of the storage element, the inverting input of the response pulse shaper is connected to the second output of the load element and to the first output for connecting the electromagnet winding, the second output of the storage element and the second output current meter are used to connect to zero power output.