SU1182618A1 - Device for precise stopping of electric drive - Google Patents

Abstract

1. DEVICE FOR EXACT STOPPING ELECTRIC DRIVE containing serially connected command unit and intensity controller, electric drive speed control unit, characterized in that, in order to increase reliability and speed of electric drive, sequentially connected speed sensor connected to the output of the electric drive speed control unit is added to it , key, delay unit, adder, the second input of which is connected to the output of the intensity setter, and the output to the unit is regulated and the speed of the drive, the second output i of the command block is connected to the second input of the key and the second input of the unit (L slowdown, the second output of which is connected to the input of the command block, and the third input to a constant input source. 00 Od 00

Description

2. The device according to claim 1, of which is that the retardation unit contains an inverting amplifier, the first key element, (3-flip-flop, amplifier, quad and sequentially connected integrator, the first adder, the second adder, the second key element, output connected to the first output of the deceleration unit connected by the third input to the second input of the first adder, the second output to the second input of the second key element, and

also through the 3 -thrigger to the output of the second adder, the deceleration unit is first connected to the first input of the integrator, and through the series-connected quad and amplifier to the second input of the second adder, the second input connected through the inverting amplifier to the first input of the first key element, the second the input of which is connected to the output of the integrator, the second input of which is connected to the output of the first key element.

one

The invention relates to electrical engineering and can be used in an automated electric drive of various industrial installations requiring precise shutdown.

The aim of the invention is to increase the reliability and speed of the drive.

Figure 1 shows the structural diagram of the device; 2 is the same; the deceleration unit J in FIG. 3 is the device speed diagrams with deceleration.

The device contains serially connected command block 1, intensity setpoint 2, adder 3, speed control unit 4 of the electric drive, speed sensor 5, key 6, delay unit 7, the first output 8 of which is connected to the adder 3, and the second output 9 - with the input of the command block 1, the second output of which is connected to the second input of the key 6 and the second input 10 of the deceleration unit 7, the third input 11 of which is connected to a source of a constant input signal.

The deceleration unit (FIG. 2) contains an inverting amplifier amplifier 12, a first key element 13, a K-5 trigger 14 amplifier 15, a quad 16, a serially connected integrator 17, a first accumulator 18, a second adder 19, a second key element 20, an output with the first output 8 of the slowing down unit 7, connected by the third input 11 to the second input of the first cy-mat, the second output

9- to the second input of the second key element 20, as well as through R-5-flip-flop 14 - to the output of the second adder 19, deceleration unit 7, the first input 21 connected to the first input of the integrator 17, as well as through the series-connected square 16

and the amplifier 15 to the second input of the second adder 19, and the second input

10connected through an inverting amplifier 12 to the first input of the first key element, the second input of which is connected to the output of the integrator 17, the second input of which is connected to the output of the first key element 13.

The device works as follows.

Depending on the speed of the drive, there are two possible deceleration modes. In the first mode, the device provides deceleration and accurate stopping of the electric drive at a speed lower than the maximum, and in the second mode, at the maximum speed of the electric drive.

To ensure optimum performance in the drive, the magnitude of the deceleration path H must be determined by the value of the maximum speed V and the maximum limit (maximum acceleration C.

According to the speed diagram (Fig. 3), where V is the speed of the electric drive t is time, the magnitude of the deceleration path H is equal to the area of the triangle Sncte determined by the maximum values of speed and acceleration, 2 Voltage (J at the third input of the deceleration unit 7 is proportional to deceleration path H. Since the deceleration path for the selected parameters is constant, taking into account its value, a deceleration impulse sensor is installed in the path of the working organ.At the speed of the electric drive V (Fig. 3), the deceleration path is equal to the area of the limited curve S (, (, (H 5a “bV Slcbc nl 1 where h is the path of deceleration with acceleration equal to zero; 2 is the path of deceleration with acceleration is less than ZERO i ,, 5v, dt-, C, T (Sv Then lV, Jt or H -H, Under this condition, a signal is given for a slowdown by a slow-down unit 7. A voltage proportional to ti is generated at the output of the integrator 17, and tij is at the output of the amplifier 15. Therefore, -U, .0. The trigger 14, since it has a characteristic and -1 ° E L 14 where the voltage determined by the power source. Consider the operation of the device in the first mode. When the Start signal is sent from the commanding unit 1, the output of the speed setting voltage is generated at the output of the intensity setting device 2, which is supplied through the adder 3 with the characteristic) - (} to the electric drive speed control unit 4, accelerating it to a speed determined by the amplitude of the signal at the output of the command device 1 When the working body of the electric drive approaches the jamming impulse sensor (not shown), the last one is triggered by the command unit 1 at the point -t 0 (Fig. 3) from the second output the signal i2: 18 - (4 voltage determined by the source This signal is fed to the key 6, which closes and connects the signal of the speed sensor 5 to the input 21 of the slowdown unit 7, and is also fed to the second input 10 of the slowing down unit 7 and then through the inverting amplifier 12 to the key element 13, which opens and prepares integrator 17. Operation. The voltage from the speed sensor 5 is supplied to the integrator 17. The voltage at the output of the integrator 17 is Uf and K UjBlT and is fed to the adder 18, which has the characteristic Ui and, 1-DT. Voltage Uf is also supplied through a quadrant 16 with characteristic C (1 / y) and through amplifier 15 with characteristic Ufs-adder 19. The transfer ratio of amplifier 15 is determined by taking into account the limited value of acceleration C. () and for this electric power, therefore, the water remains constant . , 2, .M () The voltage from the output of the adder 19c characteristic (supplied to the R-S trigger 14. When the integrator 17 operates, the voltage at the output of the adder 18 decreases. At the same time, the voltage at the output of the adder 19. At, -U -, the trigger 14 switches and at its output a voltage E is set, which is applied to the command unit 1 and the key element 20. The command unit 1 removes the speed command signal from the intensity sensor 2 (fig. 3) and starts 1) an electric drive along the b and c lines, and the key element 20 closes and connects with ignal of the output of the adder 19 to the input of the adder 3. The moment of the beginning of the inhibition c. point b is determined automatically by block 7, taking into account the distance to the end point

stop and speed of the electric drive. With a constant value of acceleration in the mode of slowing down the line t and with the forward and the signal at the output of the adder 19 is equal to zero. In the case of a perturbation of the rate of decrease in velocity during deceleration, the equality tl is violated, i.e. U, j5 O. The voltage from the output of the adder 19, in the form of a correction signal, is applied to the adder 3 and causes a change in the speed of the electric drive until U- | j is equal to zero. Thus, the acceleration during braking is also stabilized (the graph of the speed change given in Fig. 3 is given at its initial value).

When the device operates in the second mode, the speed of the electric drive is equal to the maximum, i.e. the deceleration path H is calculated for cotbra.

The drive starts and operates according to the signal from command block 1 as above. When the deceleration pulse sensor is triggered, the command block 1 sends a signal to switch the key elements 6 and 13. After closing key 6, the signal from speed sensor 5 proportional to maximum speed Un) c (x through the square 16 (Fig. 2), the amplifier 15 to the input of the adder 19. The voltage at the output of the adder 19 becomes equal to zero, i, r-0, - and, -, and,

since the voltage (i.e., when {, and

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switches on and issues a signal to the command block 1, which removes the speed reference signal from the intensity setpoint 2 (FIG. 3, t 0), and the drive starts to stop on the dp line, and the key element 20 also closes.

In this mode, the start time of the deceleration is also performed by the automatic deceleration unit 7.

The opening of the key element 13 and the signaling of the speed sensor 5 leads to the operation of the integrator 17, the increase in the voltage at the output of which ensures the equality of and, and 0.

At the same time, the voltage U through the closed key element 20 is supplied to the adder 3, which (similarly to the considered above) allows stabilizing the acceleration when braking the electric drive.

Thus, the device provides the minimum time of the slowdown period by the formation of an optimal speed diagram when the drive is decelerated by automatically selecting the start time of the deceleration and performing an exact stop of the electric drive, as well as limiting dynamic loads, eliminating oscillatory processes by stabilizing the acceleration of deceleration. These factors will increase the reliability and speed of the drive system.

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Claims (2)

1. DEVICE FOR PRECISE STOPPING OF THE ELECTRIC DRIVE, comprising a command unit and an intensity adjuster in series, an electric drive speed control unit, characterized in that, in order to increase the reliability and speed of the electric drive, serially connected to the output of the electric drive speed control unit are additionally introduced speed sensor, key, deceleration unit, adder, the second input of which is connected to the output of the intensity adjuster, and the output to the speed control unit awns actuator, the second command block output is connected to the second «g key input and the second input of the deceleration unit, the second output coupled to an input command block, and the third input - to a D.C. input signal. SU ·. 1182618 Fig / * 1182618 2. The device according to claim 1, wherein the deceleration unit comprises an inverting amplifier, a first key element, ¹ RS trigger, an amplifier, a quadrator and a series-connected integrator, a first adder, a second adder, a second key element, output connected to the first output of the deceleration unit, connected by the third input to the second input of the first adder, the second output to the second input of the second key element, and also through the R3 trigger to the output of the second adder, the deceleration unit by the first input is connected to the first input ntegratora and via series-connected quad amplifier and - to the second input of the second adder, a second input connected through an inverting amplifier to the first input of the first key element, a second input coupled to an output of the integrator, a second input coupled to an output of the first key member.